This is v12 of the 'hist triggers' patchset, incorporating suggestions
and fixing problems pointed out by Namhyung.
Changes from v11:
- Added tracing_map_lookup().
- Changed tracing_map_insert() to incorporate the hits/drops counter
updating. The changes allow clients to continue calling
tracing_map_insert() and update existing entries if desired, or
stop on the first drop, since the return value is still NULL in
that case.
- Changed the hist trigger code to continue calling
tracing_map_insert() rather than stopping on the first drop. The
idea is that there's no harm in continuing after the first drop -
if the user can't tolerate any drops, they'll still see a non-zero
drop count and can retry with a larger table, but if the user
doesn't care, the hit and drop counts are an accurate reflection
of how many events were tallied vs dropped.
- Added a new unreg_all() callback to event_command, and code to
call it when the trigger file is opened for truncate. Implemented
unreg_all() for hist triggers, which allows them to honor the
truncate flag while leaving existing triggers intact. This means
that '>>' should now be used for adding multiple hist triggers as
well as to clear/pause/cont an existing hist trigger.
- Included Namhyung's log2 patch.
- Fixed one of Masami's test cases which now requires using '>>' due
to the truncate changes.
- 'cont' and 'clear' no longer create a trigger if one doesn't exist.
- Rebased to latest trace/for-next.
- Various other smaller fixes and Documentation updates as noted by
Namhyung.
Changes from v10:
- Rebased to latest trace/for-next.
- Added Masami's ftrace/hist triggers kselftest patches.
- Added Masami's Tested-by: to the series.
Changes from v9:
v10 adds some major new features - 'named' hist triggers and support
for multiple hist triggers on a single event - basically all of the
features and suggestions suggested by Masami, except for one: I
decided after all not to implement the 'pause/continue/clear' commands
on the hist file. I've gotten so used to the habit of calling up the
previous trigger-setting command in the command history and simply
appending a 'pause/cont/clear' command to it (and later removing it by
prepending a '!') that making the user change the command doesn't seem
as naturally usable. Masami, if you disagree, let me know and I'll
reconsider it but at this point I'd rather not make that change.
In addition, I think I've fixed all the other various smaller problems
mentioned in the previous review, please let me know if I missed any...
- Added support for 'named' hist triggers
- Added support for multiple hist triggers on a single trace event
- Added documentation and examples for the above new features
- Streamlined the README to only include the essentials for hist triggers
- Fixed the 'hex' modifier for values, which was previously ignored
- Replaced the kmalloc of large arrays with a simple page-based scheme
- Fixed the tracing_map_insert() case where jhash returns 0
- Fixed various other small problems noted along the way
Changes from v8:
Same as v8, but with the RFC patch [ftrace: Add function_hist tracer]
removed, and rebased to latest trace/for-next.
Changes from v7:
This version refactors the commits as suggested by Masami. There are
now more commits, but the result should be much more reviewable. The
ending code is the same as before, modulo a couple minor bug fixes I
discovered while refactoring and testing.
I've also reviewed and fixed a number of shortcomings and errors in
the comments, and have added a new discussion of the tracing_map data
structures after Steve mentioned he found them confusing and/or
insufficiently documented.
Also, I kept Namhyung's string patch [tracing: Support string type key
properly] as submitted, but added a follow-on patch that refactors it
and fixes a problem I found with it that enabled static string keys to
contain random chars and therefore incorrect map insertions.
Changes from v6:
This version adds a new 'sym-offset' modifier as requested by Masami.
I implemented it as a modifier rather than using the trace option as
suggested, in part because I wanted to keep it all self-contained and
it seemed more consistent to just add it alongside the 'sym' modifier.
Also, hist triggers arent't really a tracer and therefore don't
directly tie into the option update/callback mechanism so making use
of it isn't as simple as a normal tracer.
I also changed the sort key specification to be stricter and signal an
error if the specified sort key wasn't found (rather than defaulting
to hitcount in those cases), also suggested by Masami. Thanks,
Masami, for your input!
Also updated the Documentation and tracing/README to reflect the
changes.
Changes from v5:
This version adds support for compound keys, along with the related
ability to sort using primary and secondary keys. This was mentioned
in previous versions as the last important piece that remained
unimplemented, and is now implemented. (I didn't have time to get to
the couple of enhancements suggested by Masami, but I expect to be
able to add those later on top of these.)
Because we now support compound keys and it's not immediately clear in
the output exactly which fields correspond to keys, the key(s),
compound or not, are now enclosed by curly braces.
The Documentation and README have been updated to reflect the changes,
and several new examples have been added to illustrate how to use
compound keys.
Also, the code was updated to work with the new ftrace_event_file,
etc, renaming in tracing/for-next.
Changes from v4:
This version addresses some problems and suggestions made by Daniel
Wagner - a lot of the code was reworked to get rid of the distinction
between keys and values, and as a result, both keys and values can be
used as sort keys. As suggested, it also allows 'val=' to be absent
in a trigger command - if no 'val' is specified, hitcount is assumed
and automatically used as the only val.
The map code was also separated out into a separate file,
tracing_map.c, allowing it to be reused. It also adds a second tracer
called function_hist that actually does reuse the code, as an RFC
patch.
Patch 01/10 [tracing: Update cond flag when enabling or disabling..]
is a fix for a problem noticed by Daniel and that fixes a problem in
existing trigger code and should be applied regardless of whether the
rest of the patchset is merged.
As mentioned, patch 10/10 is an RFC patch implementing a new tracer
based on the function tracer code. It's a fun little tool and is
useful for a specific problem I'm working on (and is also a nice test
of the tracing_map code), but is an RFC because first, I'm not sure it
would really be of general interest and secondly, it's POC-level
quality and I'd need to spend more time fixing it up to make it
upstreamable, but I don't want to waste my time if not.
There are a couple of important bits of functionality that were
present in v1 but not yet reimplemented in v5.
The first is support for compound keys. Currently, maps can only be
keyed on a single event field, whereas in v1 they could be keyed on
multiple keys. With support for compound keys, you can create much
more interesting output, such as for example per-pid lists of
syscalls or read counts e.g.:
# echo 'hist:keys=common_pid.execname,id.syscall:vals=hitcount' > \
/sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
# cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
key: common_pid:bash[3112], id:sys_write vals: count:69
key: common_pid:bash[3112], id:sys_rt_sigprocmask vals: count:218
key: common_pid:update-notifier[3164], id:sys_poll vals: count:37
key: common_pid:update-notifier[3164], id:sys_recvfrom vals: count:118
key: common_pid:deja-dup-monito[3194], id:sys_sendto vals: count:1
key: common_pid:deja-dup-monito[3194], id:sys_read vals: count:4
key: common_pid:deja-dup-monito[3194], id:sys_poll vals: count:8
key: common_pid:deja-dup-monito[3194], id:sys_recvmsg vals: count:8
key: common_pid:deja-dup-monito[3194], id:sys_getegid vals: count:8
key: common_pid:emacs[3275], id:sys_fsync vals: count:1
key: common_pid:emacs[3275], id:sys_open vals: count:1
key: common_pid:emacs[3275], id:sys_symlink vals: count:2
key: common_pid:emacs[3275], id:sys_poll vals: count:23
key: common_pid:emacs[3275], id:sys_select vals: count:23
key: common_pid:emacs[3275], id:unknown_syscall vals: count:34
key: common_pid:emacs[3275], id:sys_ioctl vals: count:60
key: common_pid:emacs[3275], id:sys_rt_sigprocmask vals: count:116
key: common_pid:cat[3323], id:sys_munmap vals: count:1
key: common_pid:cat[3323], id:sys_fadvise64 vals: count:1
Related to that is support for sorting on multiple fields. Currently,
you can sort using only a primary key. Being able to sort on multiple
or at least a secondary key is indispensible for seeing trends when
displaying multiple values.
Changes from v3:
v4 fixes the race in tracing_map_insert() noted in v3, where
map.val.key could be checked even if map.val wasn't yet set. The
simple fix for that in tracing_map_insert() introduces the possibility
of duplicates in the map, which though rare, need to be accounted for
in the output. To address that, duplicate-merging code was added to
the map-printing code.
It was also pointed out that it didn't seem correct to include
module.h, but the fix for that has deeper roots and is being addressed
by a separate patchset; for now we need to continue including
module.h, though prompted by that I did some other header include
cleanup.
The functionality remains the same as v2, but this version no longer
tries to export and use bpf_maps, and more importantly removes the
associated GFP_NOTRACE/trace event hacks and kmem macros required to
work around the bpf_map implementation.
The tracing_map functionality is instead built on top of a simple
lock-free map algorithm originated by Dr. Cliff Click (see references
in the code for more details), which though too restrictive to be
general-purpose in its current form, functions nicely as a
special-purpose tracing map.
v3 also moves the hist triggers code into a separate file and puts it
all behind a new config option, CONFIG_HIST_TRIGGERS. It also merges
in the sorting code rather than keeping it as a separate patch.
This patchset also includes a couple other new and related triggers,
enable_hist and disable_hist, very similar to the existing
enable_event/disable_event triggers used to automatically enable and
disable events based on a triggering condition, but in this case
allowing hist triggers to be enabled and disabled in the same way.
- Added an insert check for val before checking the key associated with val
- Added code to merge possible duplicates in the map
Changes from v2:
- reimplemented tracing_map, replacing bpf_map with nmi-safe/lock-free map
- removed GPF_NOTRACE, kmalloc/free macros and event hacks needed by bpf_maps
- moved hist triggers from trace_events_trigger.c to trace_events_hist.c
- added CONFIG_HIST_TRIGGERS config option
- consolidated sorting code with main patch
Changes from v1:
- completely rewritten on top of tracing_map (renamed and exported bpf_map)
- added map clearing and client ops to tracing_map
- changed the name from 'hash' triggers to 'hist' triggers
- added new trigger 'pause' feature
- added new enable_hist and disable_hist triggers
- added usage for hist/enable_hist/disable hist to tracing/README
- moved examples into Documentation/trace/event.txt
- added ___GFP_NOTRACE, kmalloc/kfree macros, and conditional kmem tracepoints
The following changes since commit e428abbbf616cd8fdd1162e4a624ad1d47b47544:
tracing: #ifdef out uses of max trace when CONFIG_TRACER_MAX_TRACE is not set (2015-11-10 10:16:05 -0500)
are available in the git repository at:
git://git.yoctoproject.org/linux-yocto-contrib.git tzanussi/hist-triggers-v12
http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/log/?h=tzanussi/hist-triggers-v12
Masami Hiramatsu (2):
kselftests/ftrace : Add event trigger testcases
kselftests/ftrace: Add hist trigger testcases
Namhyung Kim (2):
tracing: Support string type key properly
tracing: Add hist trigger 'log2' modifier
Tom Zanussi (26):
tracing: Update cond flag when enabling or disabling a trigger
tracing: Make ftrace_event_field checking functions available
tracing: Make event trigger functions available
tracing: Add event record param to trigger_ops.func()
tracing: Add get_syscall_name()
tracing: Add a per-event-trigger 'paused' field
tracing: Add needs_rec flag to event triggers
tracing: Add an unreg_all() callback to trigger commands
tracing: Add lock-free tracing_map
tracing: Add 'hist' event trigger command
tracing: Add hist trigger support for multiple values ('vals=' param)
tracing: Add hist trigger support for compound keys
tracing: Add hist trigger support for user-defined sorting ('sort='
param)
tracing: Add hist trigger support for pausing and continuing a trace
tracing: Add hist trigger support for clearing a trace
tracing: Add hist trigger 'hex' modifier for displaying numeric fields
tracing: Add hist trigger 'sym' and 'sym-offset' modifiers
tracing: Add hist trigger 'execname' modifier
tracing: Add hist trigger 'syscall' modifier
tracing: Add hist trigger support for stacktraces as keys
tracing: Remove restriction on string position in hist trigger keys
tracing: Add enable_hist/disable_hist triggers
tracing: Add 'hist' trigger Documentation
tracing: Add support for multiple hist triggers per event
tracing: Add support for named triggers
tracing: Add support for named hist triggers
Documentation/trace/events.txt | 1555 ++++++++++++++++++
include/linux/trace_events.h | 9 +-
kernel/trace/Kconfig | 27 +
kernel/trace/Makefile | 2 +
kernel/trace/trace.c | 57 +
kernel/trace/trace.h | 106 +-
kernel/trace/trace_events.c | 4 +
kernel/trace/trace_events_filter.c | 12 -
kernel/trace/trace_events_hist.c | 1731 ++++++++++++++++++++
kernel/trace/trace_events_trigger.c | 309 +++-
kernel/trace/trace_syscalls.c | 11 +
kernel/trace/tracing_map.c | 1058 ++++++++++++
kernel/trace/tracing_map.h | 282 ++++
tools/testing/selftests/ftrace/test.d/functions | 9 +
.../ftrace/test.d/trigger/trigger-eventonoff.tc | 64 +
.../ftrace/test.d/trigger/trigger-filter.tc | 59 +
.../ftrace/test.d/trigger/trigger-hist-mod.tc | 65 +
.../ftrace/test.d/trigger/trigger-hist.tc | 83 +
.../ftrace/test.d/trigger/trigger-multihist.tc | 73 +
.../ftrace/test.d/trigger/trigger-snapshot.tc | 56 +
.../ftrace/test.d/trigger/trigger-stacktrace.tc | 53 +
.../ftrace/test.d/trigger/trigger-traceonoff.tc | 58 +
22 files changed, 5596 insertions(+), 87 deletions(-)
create mode 100644 kernel/trace/trace_events_hist.c
create mode 100644 kernel/trace/tracing_map.c
create mode 100644 kernel/trace/tracing_map.h
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
--
1.9.3
When a trigger is enabled, the cond flag should be set beforehand,
otherwise a trigger that's expecting to process a trace record
(e.g. one with post_trigger set) could be invoked without one.
Likewise a trigger's cond flag should be reset after it's disabled,
not before.
Signed-off-by: Tom Zanussi <[email protected]>
Signed-off-by: Daniel Wagner <[email protected]>
Reviewed-by: Masami Hiramatsu <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace_events_trigger.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 42a4009..4d2f3cc 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -543,11 +543,12 @@ static int register_trigger(char *glob, struct event_trigger_ops *ops,
list_add_rcu(&data->list, &file->triggers);
ret++;
+ update_cond_flag(file);
if (trace_event_trigger_enable_disable(file, 1) < 0) {
list_del_rcu(&data->list);
+ update_cond_flag(file);
ret--;
}
- update_cond_flag(file);
out:
return ret;
}
@@ -575,8 +576,8 @@ static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
if (data->cmd_ops->trigger_type == test->cmd_ops->trigger_type) {
unregistered = true;
list_del_rcu(&data->list);
- update_cond_flag(file);
trace_event_trigger_enable_disable(file, 0);
+ update_cond_flag(file);
break;
}
}
@@ -1319,11 +1320,12 @@ static int event_enable_register_trigger(char *glob,
list_add_rcu(&data->list, &file->triggers);
ret++;
+ update_cond_flag(file);
if (trace_event_trigger_enable_disable(file, 1) < 0) {
list_del_rcu(&data->list);
+ update_cond_flag(file);
ret--;
}
- update_cond_flag(file);
out:
return ret;
}
@@ -1344,8 +1346,8 @@ static void event_enable_unregister_trigger(char *glob,
(enable_data->file == test_enable_data->file)) {
unregistered = true;
list_del_rcu(&data->list);
- update_cond_flag(file);
trace_event_trigger_enable_disable(file, 0);
+ update_cond_flag(file);
break;
}
}
--
1.9.3
Make is_string_field() and is_function_field() accessible outside of
trace_event_filters.c for other users of ftrace_event_fields.
Signed-off-by: Tom Zanussi <[email protected]>
Reviewed-by: Masami Hiramatsu <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 12 ++++++++++++
kernel/trace/trace_events_filter.c | 12 ------------
2 files changed, 12 insertions(+), 12 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 919d9d0..fd22cd4 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1113,6 +1113,18 @@ struct filter_pred {
unsigned short right;
};
+static inline bool is_string_field(struct ftrace_event_field *field)
+{
+ return field->filter_type == FILTER_DYN_STRING ||
+ field->filter_type == FILTER_STATIC_STRING ||
+ field->filter_type == FILTER_PTR_STRING;
+}
+
+static inline bool is_function_field(struct ftrace_event_field *field)
+{
+ return field->filter_type == FILTER_TRACE_FN;
+}
+
extern enum regex_type
filter_parse_regex(char *buff, int len, char **search, int *not);
extern void print_event_filter(struct trace_event_file *file,
diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
index f93a219..b5ca7eb 100644
--- a/kernel/trace/trace_events_filter.c
+++ b/kernel/trace/trace_events_filter.c
@@ -961,18 +961,6 @@ int filter_assign_type(const char *type)
return FILTER_OTHER;
}
-static bool is_function_field(struct ftrace_event_field *field)
-{
- return field->filter_type == FILTER_TRACE_FN;
-}
-
-static bool is_string_field(struct ftrace_event_field *field)
-{
- return field->filter_type == FILTER_DYN_STRING ||
- field->filter_type == FILTER_STATIC_STRING ||
- field->filter_type == FILTER_PTR_STRING;
-}
-
static bool is_legal_op(struct ftrace_event_field *field, int op)
{
if (is_string_field(field) &&
--
1.9.3
Make various event trigger utility functions available outside of
trace_events_trigger.c so that new triggers can be defined outside of
that file.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 14 ++++++++++++++
kernel/trace/trace_events_trigger.c | 28 +++++++++++++---------------
2 files changed, 27 insertions(+), 15 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index fd22cd4..2aa03be 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1176,6 +1176,20 @@ struct event_trigger_data {
struct list_head list;
};
+extern void trigger_data_free(struct event_trigger_data *data);
+extern int event_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data);
+extern int trace_event_trigger_enable_disable(struct trace_event_file *file,
+ int trigger_enable);
+extern void update_cond_flag(struct trace_event_file *file);
+extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file);
+extern int set_trigger_filter(char *filter_str,
+ struct event_trigger_data *trigger_data,
+ struct trace_event_file *file);
+extern int register_event_command(struct event_command *cmd);
+
/**
* struct event_trigger_ops - callbacks for trace event triggers
*
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 4d2f3cc..6087052 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -28,8 +28,7 @@
static LIST_HEAD(trigger_commands);
static DEFINE_MUTEX(trigger_cmd_mutex);
-static void
-trigger_data_free(struct event_trigger_data *data)
+void trigger_data_free(struct event_trigger_data *data)
{
if (data->cmd_ops->set_filter)
data->cmd_ops->set_filter(NULL, data, NULL);
@@ -311,7 +310,7 @@ const struct file_operations event_trigger_fops = {
* Currently we only register event commands from __init, so mark this
* __init too.
*/
-static __init int register_event_command(struct event_command *cmd)
+__init int register_event_command(struct event_command *cmd)
{
struct event_command *p;
int ret = 0;
@@ -400,9 +399,8 @@ event_trigger_print(const char *name, struct seq_file *m,
*
* Return: 0 on success, errno otherwise
*/
-static int
-event_trigger_init(struct event_trigger_ops *ops,
- struct event_trigger_data *data)
+int event_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
{
data->ref++;
return 0;
@@ -430,8 +428,8 @@ event_trigger_free(struct event_trigger_ops *ops,
trigger_data_free(data);
}
-static int trace_event_trigger_enable_disable(struct trace_event_file *file,
- int trigger_enable)
+int trace_event_trigger_enable_disable(struct trace_event_file *file,
+ int trigger_enable)
{
int ret = 0;
@@ -488,7 +486,7 @@ clear_event_triggers(struct trace_array *tr)
* its TRIGGER_COND bit set, otherwise the TRIGGER_COND bit should be
* cleared.
*/
-static void update_cond_flag(struct trace_event_file *file)
+void update_cond_flag(struct trace_event_file *file)
{
struct event_trigger_data *data;
bool set_cond = false;
@@ -565,9 +563,9 @@ out:
* Usually used directly as the @unreg method in event command
* implementations.
*/
-static void unregister_trigger(char *glob, struct event_trigger_ops *ops,
- struct event_trigger_data *test,
- struct trace_event_file *file)
+void unregister_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file)
{
struct event_trigger_data *data;
bool unregistered = false;
@@ -701,9 +699,9 @@ event_trigger_callback(struct event_command *cmd_ops,
*
* Return: 0 on success, errno otherwise
*/
-static int set_trigger_filter(char *filter_str,
- struct event_trigger_data *trigger_data,
- struct trace_event_file *file)
+int set_trigger_filter(char *filter_str,
+ struct event_trigger_data *trigger_data,
+ struct trace_event_file *file)
{
struct event_trigger_data *data = trigger_data;
struct event_filter *filter = NULL, *tmp;
--
1.9.3
Some triggers may need access to the trace event, so pass it in. Also
fix up the existing trigger funcs and their callers.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
include/linux/trace_events.h | 7 ++++---
kernel/trace/trace.h | 6 ++++--
kernel/trace/trace_events_trigger.c | 36 +++++++++++++++++++-----------------
3 files changed, 27 insertions(+), 22 deletions(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 429fdfc..95e8fef 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -430,7 +430,8 @@ extern int call_filter_check_discard(struct trace_event_call *call, void *rec,
extern enum event_trigger_type event_triggers_call(struct trace_event_file *file,
void *rec);
extern void event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt);
+ enum event_trigger_type tt,
+ void *rec);
bool trace_event_ignore_this_pid(struct trace_event_file *trace_file);
@@ -517,7 +518,7 @@ event_trigger_unlock_commit(struct trace_event_file *file,
trace_buffer_unlock_commit(file->tr, buffer, event, irq_flags, pc);
if (tt)
- event_triggers_post_call(file, tt);
+ event_triggers_post_call(file, tt, entry);
}
/**
@@ -550,7 +551,7 @@ event_trigger_unlock_commit_regs(struct trace_event_file *file,
irq_flags, pc, regs);
if (tt)
- event_triggers_post_call(file, tt);
+ event_triggers_post_call(file, tt, entry);
}
#ifdef CONFIG_BPF_EVENTS
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2aa03be..c8cf683 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1202,7 +1202,8 @@ extern int register_event_command(struct event_command *cmd);
* @func: The trigger 'probe' function called when the triggering
* event occurs. The data passed into this callback is the data
* that was supplied to the event_command @reg() function that
- * registered the trigger (see struct event_command).
+ * registered the trigger (see struct event_command) along with
+ * the trace record, rec.
*
* @init: An optional initialization function called for the trigger
* when the trigger is registered (via the event_command reg()
@@ -1227,7 +1228,8 @@ extern int register_event_command(struct event_command *cmd);
* (see trace_event_triggers.c).
*/
struct event_trigger_ops {
- void (*func)(struct event_trigger_data *data);
+ void (*func)(struct event_trigger_data *data,
+ void *rec);
int (*init)(struct event_trigger_ops *ops,
struct event_trigger_data *data);
void (*free)(struct event_trigger_ops *ops,
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 6087052..c3abef6 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -73,7 +73,7 @@ event_triggers_call(struct trace_event_file *file, void *rec)
list_for_each_entry_rcu(data, &file->triggers, list) {
if (!rec) {
- data->ops->func(data);
+ data->ops->func(data, rec);
continue;
}
filter = rcu_dereference_sched(data->filter);
@@ -83,7 +83,7 @@ event_triggers_call(struct trace_event_file *file, void *rec)
tt |= data->cmd_ops->trigger_type;
continue;
}
- data->ops->func(data);
+ data->ops->func(data, rec);
}
return tt;
}
@@ -93,6 +93,7 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
* event_triggers_post_call - Call 'post_triggers' for a trace event
* @file: The trace_event_file associated with the event
* @tt: enum event_trigger_type containing a set bit for each trigger to invoke
+ * @rec: The trace entry for the event
*
* For each trigger associated with an event, invoke the trigger
* function registered with the associated trigger command, if the
@@ -103,13 +104,14 @@ EXPORT_SYMBOL_GPL(event_triggers_call);
*/
void
event_triggers_post_call(struct trace_event_file *file,
- enum event_trigger_type tt)
+ enum event_trigger_type tt,
+ void *rec)
{
struct event_trigger_data *data;
list_for_each_entry_rcu(data, &file->triggers, list) {
if (data->cmd_ops->trigger_type & tt)
- data->ops->func(data);
+ data->ops->func(data, rec);
}
}
EXPORT_SYMBOL_GPL(event_triggers_post_call);
@@ -750,7 +752,7 @@ int set_trigger_filter(char *filter_str,
}
static void
-traceon_trigger(struct event_trigger_data *data)
+traceon_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@@ -759,7 +761,7 @@ traceon_trigger(struct event_trigger_data *data)
}
static void
-traceon_count_trigger(struct event_trigger_data *data)
+traceon_count_trigger(struct event_trigger_data *data, void *rec)
{
if (tracing_is_on())
return;
@@ -774,7 +776,7 @@ traceon_count_trigger(struct event_trigger_data *data)
}
static void
-traceoff_trigger(struct event_trigger_data *data)
+traceoff_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@@ -783,7 +785,7 @@ traceoff_trigger(struct event_trigger_data *data)
}
static void
-traceoff_count_trigger(struct event_trigger_data *data)
+traceoff_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!tracing_is_on())
return;
@@ -879,13 +881,13 @@ static struct event_command trigger_traceoff_cmd = {
#ifdef CONFIG_TRACER_SNAPSHOT
static void
-snapshot_trigger(struct event_trigger_data *data)
+snapshot_trigger(struct event_trigger_data *data, void *rec)
{
tracing_snapshot();
}
static void
-snapshot_count_trigger(struct event_trigger_data *data)
+snapshot_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@@ -893,7 +895,7 @@ snapshot_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- snapshot_trigger(data);
+ snapshot_trigger(data, rec);
}
static int
@@ -972,13 +974,13 @@ static __init int register_trigger_snapshot_cmd(void) { return 0; }
#define STACK_SKIP 3
static void
-stacktrace_trigger(struct event_trigger_data *data)
+stacktrace_trigger(struct event_trigger_data *data, void *rec)
{
trace_dump_stack(STACK_SKIP);
}
static void
-stacktrace_count_trigger(struct event_trigger_data *data)
+stacktrace_count_trigger(struct event_trigger_data *data, void *rec)
{
if (!data->count)
return;
@@ -986,7 +988,7 @@ stacktrace_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- stacktrace_trigger(data);
+ stacktrace_trigger(data, rec);
}
static int
@@ -1057,7 +1059,7 @@ struct enable_trigger_data {
};
static void
-event_enable_trigger(struct event_trigger_data *data)
+event_enable_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@@ -1068,7 +1070,7 @@ event_enable_trigger(struct event_trigger_data *data)
}
static void
-event_enable_count_trigger(struct event_trigger_data *data)
+event_enable_count_trigger(struct event_trigger_data *data, void *rec)
{
struct enable_trigger_data *enable_data = data->private_data;
@@ -1082,7 +1084,7 @@ event_enable_count_trigger(struct event_trigger_data *data)
if (data->count != -1)
(data->count)--;
- event_enable_trigger(data);
+ event_enable_trigger(data, rec);
}
static int
--
1.9.3
Add a utility function to grab the syscall name from the syscall
metadata, given a syscall id.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 5 +++++
kernel/trace/trace_syscalls.c | 11 +++++++++++
2 files changed, 16 insertions(+)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index c8cf683..5d5fede 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1395,8 +1395,13 @@ int perf_ftrace_event_register(struct trace_event_call *call,
#ifdef CONFIG_FTRACE_SYSCALLS
void init_ftrace_syscalls(void);
+const char *get_syscall_name(int syscall);
#else
static inline void init_ftrace_syscalls(void) { }
+static inline const char *get_syscall_name(int syscall)
+{
+ return NULL;
+}
#endif
#ifdef CONFIG_EVENT_TRACING
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 0655afb..50be560 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -106,6 +106,17 @@ static struct syscall_metadata *syscall_nr_to_meta(int nr)
return syscalls_metadata[nr];
}
+const char *get_syscall_name(int syscall)
+{
+ struct syscall_metadata *entry;
+
+ entry = syscall_nr_to_meta(syscall);
+ if (!entry)
+ return NULL;
+
+ return entry->name;
+}
+
static enum print_line_t
print_syscall_enter(struct trace_iterator *iter, int flags,
struct trace_event *event)
--
1.9.3
Add a simple per-trigger 'paused' flag, allowing individual triggers
to pause. We could leave it to individual triggers that need this
functionality to do it themselves, but we also want to allow other
events to control pausing, so add it to the trigger data.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 1 +
kernel/trace/trace_events_trigger.c | 4 ++++
2 files changed, 5 insertions(+)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5d5fede..5e23a97 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1173,6 +1173,7 @@ struct event_trigger_data {
struct event_filter __rcu *filter;
char *filter_str;
void *private_data;
+ bool paused;
struct list_head list;
};
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index c3abef6..8375d29 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -72,6 +72,8 @@ event_triggers_call(struct trace_event_file *file, void *rec)
return tt;
list_for_each_entry_rcu(data, &file->triggers, list) {
+ if (data->paused)
+ continue;
if (!rec) {
data->ops->func(data, rec);
continue;
@@ -110,6 +112,8 @@ event_triggers_post_call(struct trace_event_file *file,
struct event_trigger_data *data;
list_for_each_entry_rcu(data, &file->triggers, list) {
+ if (data->paused)
+ continue;
if (data->cmd_ops->trigger_type & tt)
data->ops->func(data, rec);
}
--
1.9.3
Add a new needs_rec flag for triggers that require unconditional
access to trace records in order to function.
Normally a trigger requires access to the contents of a trace record
only if it has a filter associated with it (since filters need the
contents of a record in order to make a filtering decision). Some
types of triggers, such as 'hist' triggers, require access to trace
record contents independent of the presence of filters, so add a new
flag for those triggers.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 7 +++++++
kernel/trace/trace_events_trigger.c | 3 ++-
2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 5e23a97..300add5 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1293,6 +1293,12 @@ struct event_trigger_ops {
* itself logs to the trace buffer, this flag should be set,
* otherwise it can be left unspecified.
*
+ * @needs_rec: A flag that says whether or not this command needs
+ * access to the trace record in order to perform its function,
+ * regardless of whether or not it has a filter associated with
+ * it (filters make a trigger require access to the trace record
+ * but are not always present).
+ *
* All the methods below, except for @set_filter(), must be
* implemented.
*
@@ -1333,6 +1339,7 @@ struct event_command {
char *name;
enum event_trigger_type trigger_type;
bool post_trigger;
+ bool needs_rec;
int (*func)(struct event_command *cmd_ops,
struct trace_event_file *file,
char *glob, char *cmd, char *params);
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 8375d29..2f881e9 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -498,7 +498,8 @@ void update_cond_flag(struct trace_event_file *file)
bool set_cond = false;
list_for_each_entry_rcu(data, &file->triggers, list) {
- if (data->filter || data->cmd_ops->post_trigger) {
+ if (data->filter || data->cmd_ops->post_trigger ||
+ data->cmd_ops->needs_rec) {
set_cond = true;
break;
}
--
1.9.3
Add a new unreg_all() callback that can be used to remove all
command-specific triggers from an event and arrange to have it called
whenever a trigger file is opened with O_TRUNC set.
Commands that don't want truncate semantics, or existing commands that
don't implement this function simply do nothing and their triggers
remain intact.
Signed-off-by: Tom Zanussi <[email protected]>
---
kernel/trace/trace.h | 9 +++++++--
kernel/trace/trace_events_trigger.c | 13 +++++++++++++
2 files changed, 20 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 300add5..2028e98 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1299,8 +1299,8 @@ struct event_trigger_ops {
* it (filters make a trigger require access to the trace record
* but are not always present).
*
- * All the methods below, except for @set_filter(), must be
- * implemented.
+ * All the methods below, except for @set_filter() and @unreg_all(),
+ * must be implemented.
*
* @func: The callback function responsible for parsing and
* registering the trigger written to the 'trigger' file by the
@@ -1325,6 +1325,10 @@ struct event_trigger_ops {
* This is usually implemented by the generic utility function
* @unregister_trigger() (see trace_event_triggers.c).
*
+ * @unreg_all: An optional function called to remove all the triggers
+ * from the list of triggers associated with the event. Called
+ * when a trigger file is opened in truncate mode.
+ *
* @set_filter: An optional function called to parse and set a filter
* for the trigger. If no @set_filter() method is set for the
* event command, filters set by the user for the command will be
@@ -1351,6 +1355,7 @@ struct event_command {
struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file);
+ void (*unreg_all)(struct trace_event_file *file);
int (*set_filter)(char *filter_str,
struct event_trigger_data *data,
struct trace_event_file *file);
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 2f881e9..362ae86 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -193,6 +193,19 @@ static int event_trigger_regex_open(struct inode *inode, struct file *file)
return -ENODEV;
}
+ if ((file->f_mode & FMODE_WRITE) &&
+ (file->f_flags & O_TRUNC)) {
+ struct trace_event_file *event_file;
+ struct event_command *p;
+
+ event_file = event_file_data(file);
+
+ list_for_each_entry(p, &trigger_commands, list) {
+ if (p->unreg_all)
+ p->unreg_all(event_file);
+ }
+ }
+
if (file->f_mode & FMODE_READ) {
ret = seq_open(file, &event_triggers_seq_ops);
if (!ret) {
--
1.9.3
Add tracing_map, a special-purpose lock-free map for tracing.
tracing_map is designed to aggregate or 'sum' one or more values
associated with a specific object of type tracing_map_elt, which
is associated by the map to a given key.
It provides various hooks allowing per-tracer customization and is
separated out into a separate file in order to allow it to be shared
between multiple tracers, but isn't meant to be generally used outside
of that context.
The tracing_map implementation was inspired by lock-free map
algorithms originated by Dr. Cliff Click:
http://www.azulsystems.com/blog/cliff/2007-03-26-non-blocking-hashtable
http://www.azulsystems.com/events/javaone_2007/2007_LockFreeHash.pdf
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/Kconfig | 13 +
kernel/trace/Makefile | 1 +
kernel/trace/tracing_map.c | 1058 ++++++++++++++++++++++++++++++++++++++++++++
kernel/trace/tracing_map.h | 282 ++++++++++++
4 files changed, 1354 insertions(+)
create mode 100644 kernel/trace/tracing_map.c
create mode 100644 kernel/trace/tracing_map.h
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 8d6363f..0c61e98 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -528,6 +528,19 @@ config MMIOTRACE
See Documentation/trace/mmiotrace.txt.
If you are not helping to develop drivers, say N.
+config TRACING_MAP
+ bool
+ depends on ARCH_HAVE_NMI_SAFE_CMPXCHG
+ default n
+ help
+ tracing_map is a special-purpose lock-free map for tracing,
+ separated out as a stand-alone facility in order to allow it
+ to be shared between multiple tracers. It isn't meant to be
+ generally used outside of that context, and is normally
+ selected by tracers that use it.
+
+ If in doubt, say N.
+
config MMIOTRACE_TEST
tristate "Test module for mmiotrace"
depends on MMIOTRACE && m
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 9b1044e..4255c40 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_TRACING) += trace_output.o
obj-$(CONFIG_TRACING) += trace_seq.o
obj-$(CONFIG_TRACING) += trace_stat.o
obj-$(CONFIG_TRACING) += trace_printk.o
+obj-$(CONFIG_TRACING_MAP) += tracing_map.o
obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
new file mode 100644
index 0000000..dd6401d
--- /dev/null
+++ b/kernel/trace/tracing_map.c
@@ -0,0 +1,1058 @@
+/*
+ * tracing_map - lock-free map for tracing
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2015 Tom Zanussi <[email protected]>
+ *
+ * tracing_map implementation inspired by lock-free map algorithms
+ * originated by Dr. Cliff Click:
+ *
+ * http://www.azulsystems.com/blog/cliff/2007-03-26-non-blocking-hashtable
+ * http://www.azulsystems.com/events/javaone_2007/2007_LockFreeHash.pdf
+ */
+
+#include <linux/vmalloc.h>
+#include <linux/jhash.h>
+#include <linux/slab.h>
+#include <linux/sort.h>
+
+#include "tracing_map.h"
+#include "trace.h"
+
+/*
+ * NOTE: For a detailed description of the data structures used by
+ * these functions (such as tracing_map_elt) please see the overview
+ * of tracing_map data structures at the beginning of tracing_map.h.
+ */
+
+/**
+ * tracing_map_update_sum - Add a value to a tracing_map_elt's sum field
+ * @elt: The tracing_map_elt
+ * @i: The index of the given sum associated with the tracing_map_elt
+ * @n: The value to add to the sum
+ *
+ * Add n to sum i associated with the specified tracing_map_elt
+ * instance. The index i is the index returned by the call to
+ * tracing_map_add_sum_field() when the tracing map was set up.
+ */
+void tracing_map_update_sum(struct tracing_map_elt *elt, unsigned int i, u64 n)
+{
+ atomic64_add(n, &elt->fields[i].sum);
+}
+
+/**
+ * tracing_map_read_sum - Return the value of a tracing_map_elt's sum field
+ * @elt: The tracing_map_elt
+ * @i: The index of the given sum associated with the tracing_map_elt
+ *
+ * Retrieve the value of the sum i associated with the specified
+ * tracing_map_elt instance. The index i is the index returned by the
+ * call to tracing_map_add_sum_field() when the tracing map was set
+ * up.
+ *
+ * Return: The sum associated with field i for elt.
+ */
+u64 tracing_map_read_sum(struct tracing_map_elt *elt, unsigned int i)
+{
+ return (u64)atomic64_read(&elt->fields[i].sum);
+}
+
+int tracing_map_cmp_string(void *val_a, void *val_b)
+{
+ char *a = val_a;
+ char *b = val_b;
+
+ return strcmp(a, b);
+}
+
+int tracing_map_cmp_none(void *val_a, void *val_b)
+{
+ return 0;
+}
+
+static int tracing_map_cmp_atomic64(void *val_a, void *val_b)
+{
+ u64 a = atomic64_read((atomic64_t *)val_a);
+ u64 b = atomic64_read((atomic64_t *)val_b);
+
+ return (a > b) ? 1 : ((a < b) ? -1 : 0);
+}
+
+#define DEFINE_TRACING_MAP_CMP_FN(type) \
+static int tracing_map_cmp_##type(void *val_a, void *val_b) \
+{ \
+ type a = *(type *)val_a; \
+ type b = *(type *)val_b; \
+ \
+ return (a > b) ? 1 : ((a < b) ? -1 : 0); \
+}
+
+DEFINE_TRACING_MAP_CMP_FN(s64);
+DEFINE_TRACING_MAP_CMP_FN(u64);
+DEFINE_TRACING_MAP_CMP_FN(s32);
+DEFINE_TRACING_MAP_CMP_FN(u32);
+DEFINE_TRACING_MAP_CMP_FN(s16);
+DEFINE_TRACING_MAP_CMP_FN(u16);
+DEFINE_TRACING_MAP_CMP_FN(s8);
+DEFINE_TRACING_MAP_CMP_FN(u8);
+
+tracing_map_cmp_fn_t tracing_map_cmp_num(int field_size,
+ int field_is_signed)
+{
+ tracing_map_cmp_fn_t fn = tracing_map_cmp_none;
+
+ switch (field_size) {
+ case 8:
+ if (field_is_signed)
+ fn = tracing_map_cmp_s64;
+ else
+ fn = tracing_map_cmp_u64;
+ break;
+ case 4:
+ if (field_is_signed)
+ fn = tracing_map_cmp_s32;
+ else
+ fn = tracing_map_cmp_u32;
+ break;
+ case 2:
+ if (field_is_signed)
+ fn = tracing_map_cmp_s16;
+ else
+ fn = tracing_map_cmp_u16;
+ break;
+ case 1:
+ if (field_is_signed)
+ fn = tracing_map_cmp_s8;
+ else
+ fn = tracing_map_cmp_u8;
+ break;
+ }
+
+ return fn;
+}
+
+static int tracing_map_add_field(struct tracing_map *map,
+ tracing_map_cmp_fn_t cmp_fn)
+{
+ int ret = -EINVAL;
+
+ if (map->n_fields < TRACING_MAP_FIELDS_MAX) {
+ ret = map->n_fields;
+ map->fields[map->n_fields++].cmp_fn = cmp_fn;
+ }
+
+ return ret;
+}
+
+/**
+ * tracing_map_add_sum_field - Add a field describing a tracing_map sum
+ * @map: The tracing_map
+ *
+ * Add a sum field to the key and return the index identifying it in
+ * the map and associated tracing_map_elts. This is the index used
+ * for instance to update a sum for a particular tracing_map_elt using
+ * tracing_map_update_sum() or reading it via tracing_map_read_sum().
+ *
+ * Return: The index identifying the field in the map and associated
+ * tracing_map_elts.
+ */
+int tracing_map_add_sum_field(struct tracing_map *map)
+{
+ return tracing_map_add_field(map, tracing_map_cmp_atomic64);
+}
+
+/**
+ * tracing_map_add_key_field - Add a field describing a tracing_map key
+ * @map: The tracing_map
+ * @offset: The offset within the key
+ * @cmp_fn: The comparison function that will be used to sort on the key
+ *
+ * Let the map know there is a key and that if it's used as a sort key
+ * to use cmp_fn.
+ *
+ * A key can be a subset of a compound key; for that purpose, the
+ * offset param is used to describe where within the the compound key
+ * the key referenced by this key field resides.
+ *
+ * Return: The index identifying the field in the map and associated
+ * tracing_map_elts.
+ */
+int tracing_map_add_key_field(struct tracing_map *map,
+ unsigned int offset,
+ tracing_map_cmp_fn_t cmp_fn)
+
+{
+ int idx = tracing_map_add_field(map, cmp_fn);
+
+ if (idx < 0)
+ return idx;
+
+ map->fields[idx].offset = offset;
+
+ map->key_idx[map->n_keys++] = idx;
+
+ return idx;
+}
+
+void tracing_map_array_clear(struct tracing_map_array *a)
+{
+ unsigned int i;
+
+ if (!a->pages)
+ return;
+
+ for (i = 0; i < a->n_pages; i++)
+ memset(a->pages[i], 0, PAGE_SIZE);
+}
+
+void tracing_map_array_free(struct tracing_map_array *a)
+{
+ unsigned int i;
+
+ if (!a)
+ return;
+
+ if (!a->pages) {
+ kfree(a);
+ return;
+ }
+
+ for (i = 0; i < a->n_pages; i++) {
+ if (!a->pages[i])
+ break;
+ free_page((unsigned long)a->pages[i]);
+ }
+}
+
+struct tracing_map_array *tracing_map_array_alloc(unsigned int n_elts,
+ unsigned int entry_size)
+{
+ struct tracing_map_array *a;
+ unsigned int i;
+
+ a = kzalloc(sizeof(*a), GFP_KERNEL);
+ if (!a)
+ return NULL;
+
+ a->entry_size_shift = fls(roundup_pow_of_two(entry_size) - 1);
+ a->entries_per_page = PAGE_SIZE / (1 << a->entry_size_shift);
+ a->n_pages = n_elts / a->entries_per_page;
+ if (!a->n_pages)
+ a->n_pages = 1;
+ a->entry_shift = fls(a->entries_per_page) - 1;
+ a->entry_mask = (1 << a->entry_shift) - 1;
+
+ a->pages = kcalloc(a->n_pages, sizeof(void *), GFP_KERNEL);
+ if (!a->pages)
+ goto free;
+
+ for (i = 0; i < a->n_pages; i++) {
+ a->pages[i] = (void *)get_zeroed_page(GFP_KERNEL);
+ if (!a->pages[i])
+ goto free;
+ }
+ out:
+ return a;
+ free:
+ tracing_map_array_free(a);
+ a = NULL;
+
+ goto out;
+}
+
+static void tracing_map_elt_clear(struct tracing_map_elt *elt)
+{
+ unsigned i;
+
+ for (i = 0; i < elt->map->n_fields; i++)
+ if (elt->fields[i].cmp_fn == tracing_map_cmp_atomic64)
+ atomic64_set(&elt->fields[i].sum, 0);
+
+ if (elt->map->ops && elt->map->ops->elt_clear)
+ elt->map->ops->elt_clear(elt);
+}
+
+static void tracing_map_elt_init_fields(struct tracing_map_elt *elt)
+{
+ unsigned int i;
+
+ tracing_map_elt_clear(elt);
+
+ for (i = 0; i < elt->map->n_fields; i++) {
+ elt->fields[i].cmp_fn = elt->map->fields[i].cmp_fn;
+
+ if (elt->fields[i].cmp_fn != tracing_map_cmp_atomic64)
+ elt->fields[i].offset = elt->map->fields[i].offset;
+ }
+}
+
+static void tracing_map_elt_free(struct tracing_map_elt *elt)
+{
+ if (!elt)
+ return;
+
+ if (elt->map->ops && elt->map->ops->elt_free)
+ elt->map->ops->elt_free(elt);
+ kfree(elt->fields);
+ kfree(elt->key);
+ kfree(elt);
+}
+
+static struct tracing_map_elt *tracing_map_elt_alloc(struct tracing_map *map)
+{
+ struct tracing_map_elt *elt;
+ int err = 0;
+
+ elt = kzalloc(sizeof(*elt), GFP_KERNEL);
+ if (!elt)
+ return ERR_PTR(-ENOMEM);
+
+ elt->map = map;
+
+ elt->key = kzalloc(map->key_size, GFP_KERNEL);
+ if (!elt->key) {
+ err = -ENOMEM;
+ goto free;
+ }
+
+ elt->fields = kcalloc(map->n_fields, sizeof(*elt->fields), GFP_KERNEL);
+ if (!elt->fields) {
+ err = -ENOMEM;
+ goto free;
+ }
+
+ tracing_map_elt_init_fields(elt);
+
+ if (map->ops && map->ops->elt_alloc) {
+ err = map->ops->elt_alloc(elt);
+ if (err)
+ goto free;
+ }
+ return elt;
+ free:
+ tracing_map_elt_free(elt);
+
+ return ERR_PTR(err);
+}
+
+static struct tracing_map_elt *get_free_elt(struct tracing_map *map)
+{
+ struct tracing_map_elt *elt = NULL;
+ int idx;
+
+ idx = atomic_inc_return(&map->next_elt);
+ if (idx < map->max_elts) {
+ elt = *(TRACING_MAP_ELT(map->elts, idx));
+ if (map->ops && map->ops->elt_init)
+ map->ops->elt_init(elt);
+ }
+
+ return elt;
+}
+
+static void tracing_map_free_elts(struct tracing_map *map)
+{
+ unsigned int i;
+
+ if (!map->elts)
+ return;
+
+ for (i = 0; i < map->max_elts; i++)
+ tracing_map_elt_free(*(TRACING_MAP_ELT(map->elts, i)));
+
+ tracing_map_array_free(map->elts);
+}
+
+static int tracing_map_alloc_elts(struct tracing_map *map)
+{
+ unsigned int i;
+
+ map->elts = tracing_map_array_alloc(map->max_elts,
+ sizeof(struct tracing_map_elt *));
+ if (!map->elts)
+ return -ENOMEM;
+
+ for (i = 0; i < map->max_elts; i++) {
+ *(TRACING_MAP_ELT(map->elts, i)) = tracing_map_elt_alloc(map);
+ if (!(*(TRACING_MAP_ELT(map->elts, i)))) {
+ tracing_map_free_elts(map);
+
+ return -ENOMEM;
+ }
+ }
+
+ return 0;
+}
+
+static inline bool keys_match(void *key, void *test_key, unsigned key_size)
+{
+ bool match = true;
+
+ if (memcmp(key, test_key, key_size))
+ match = false;
+
+ return match;
+}
+
+static inline struct tracing_map_elt *
+__tracing_map_insert(struct tracing_map *map, void *key, bool lookup_only)
+{
+ u32 idx, key_hash, test_key;
+ struct tracing_map_entry *entry;
+
+ key_hash = jhash(key, map->key_size, 0);
+ if (key_hash == 0)
+ key_hash = 1;
+ idx = key_hash >> (32 - (map->map_bits + 1));
+
+ while (1) {
+ idx &= (map->map_size - 1);
+ entry = TRACING_MAP_ENTRY(map->map, idx);
+ test_key = entry->key;
+
+ if (test_key && test_key == key_hash && entry->val &&
+ keys_match(key, entry->val->key, map->key_size)) {
+ atomic64_inc(&map->hits);
+ return entry->val;
+ }
+
+ if (!test_key) {
+ if (lookup_only)
+ break;
+
+ if (!cmpxchg(&entry->key, 0, key_hash)) {
+ struct tracing_map_elt *elt;
+
+ elt = get_free_elt(map);
+ if (!elt) {
+ atomic64_inc(&map->drops);
+ entry->key = 0;
+ break;
+ }
+
+ memcpy(elt->key, key, map->key_size);
+ entry->val = elt;
+ atomic64_inc(&map->hits);
+
+ return entry->val;
+ }
+ }
+
+ idx++;
+ }
+
+ return NULL;
+}
+
+/**
+ * tracing_map_insert - Insert key and/or retrieve val from a tracing_map
+ * @map: The tracing_map to insert into
+ * @key: The key to insert
+ *
+ * Inserts a key into a tracing_map and creates and returns a new
+ * tracing_map_elt for it, or if the key has already been inserted by
+ * a previous call, returns the tracing_map_elt already associated
+ * with it. When the map was created, the number of elements to be
+ * allocated for the map was specified (internally maintained as
+ * 'max_elts' in struct tracing_map), and that number of
+ * tracing_map_elts was created by tracing_map_init(). This is the
+ * pre-allocated pool of tracing_map_elts that tracing_map_insert()
+ * will allocate from when adding new keys. Once that pool is
+ * exhausted, tracing_map_insert() is useless and will return NULL to
+ * signal that state. There are two user-visible tracing_map
+ * variables, 'hits' and 'drops', which are updated by this function.
+ * Every time an element is either successfully inserted or retrieved,
+ * the 'hits' value is incrememented. Every time an element insertion
+ * fails, the 'drops' value is incremented.
+ *
+ * This is a lock-free tracing map insertion function implementing a
+ * modified form of Cliff Click's basic insertion algorithm. It
+ * requires the table size be a power of two. To prevent any
+ * possibility of an infinite loop we always make the internal table
+ * size double the size of the requested table size (max_elts * 2).
+ * Likewise, we never reuse a slot or resize or delete elements - when
+ * we've reached max_elts entries, we simply return NULL once we've
+ * run out of entries. Readers can at any point in time traverse the
+ * tracing map and safely access the key/val pairs.
+ *
+ * Return: the tracing_map_elt pointer val associated with the key.
+ * If this was a newly inserted key, the val will be a newly allocated
+ * and associated tracing_map_elt pointer val. If the key wasn't
+ * found and the pool of tracing_map_elts has been exhausted, NULL is
+ * returned and no further insertions will succeed.
+ */
+struct tracing_map_elt *tracing_map_insert(struct tracing_map *map, void *key)
+{
+ return __tracing_map_insert(map, key, false);
+}
+
+/**
+ * tracing_map_lookup - Retrieve val from a tracing_map
+ * @map: The tracing_map to perform the lookup on
+ * @key: The key to look up
+ *
+ * Looks up key in tracing_map and if found returns the matching
+ * tracing_map_elt. This is a lock-free lookup; see
+ * tracing_map_insert() for details on tracing_map and how it works.
+ * Every time an element is retrieved, the 'hits' value is
+ * incrememented. There is one user-visible tracing_map variable,
+ * 'hits', which is updated by this function. Every time an element
+ * is successfully retrieved, the 'hits' value is incrememented. The
+ * 'drops' value is never updated by this function.
+ *
+ * Return: the tracing_map_elt pointer val associated with the key.
+ * If the key wasn't found, NULL is returned.
+ */
+struct tracing_map_elt *tracing_map_lookup(struct tracing_map *map, void *key)
+{
+ return __tracing_map_insert(map, key, true);
+}
+
+/**
+ * tracing_map_destroy - Destroy a tracing_map
+ * @map: The tracing_map to destroy
+ *
+ * Frees a tracing_map along with its associated array of
+ * tracing_map_elts.
+ *
+ * Callers should make sure there are no readers or writers actively
+ * reading or inserting into the map before calling this.
+ */
+void tracing_map_destroy(struct tracing_map *map)
+{
+ if (!map)
+ return;
+
+ tracing_map_free_elts(map);
+
+ tracing_map_array_free(map->map);
+ kfree(map);
+}
+
+/**
+ * tracing_map_clear - Clear a tracing_map
+ * @map: The tracing_map to clear
+ *
+ * Resets the tracing map to a cleared or initial state. The
+ * tracing_map_elts are all cleared, and the array of struct
+ * tracing_map_entry is reset to an initialized state.
+ *
+ * Callers should make sure there are no writers actively inserting
+ * into the map before calling this.
+ */
+void tracing_map_clear(struct tracing_map *map)
+{
+ unsigned int i;
+
+ atomic_set(&map->next_elt, -1);
+ atomic64_set(&map->hits, 0);
+ atomic64_set(&map->drops, 0);
+
+ tracing_map_array_clear(map->map);
+
+ for (i = 0; i < map->max_elts; i++)
+ tracing_map_elt_clear(*(TRACING_MAP_ELT(map->elts, i)));
+}
+
+static void set_sort_key(struct tracing_map *map,
+ struct tracing_map_sort_key *sort_key)
+{
+ map->sort_key = *sort_key;
+}
+
+/**
+ * tracing_map_create - Create a lock-free map and element pool
+ * @map_bits: The size of the map (2 ** map_bits)
+ * @key_size: The size of the key for the map in bytes
+ * @ops: Optional client-defined tracing_map_ops instance
+ * @private_data: Client data associated with the map
+ *
+ * Creates and sets up a map to contain 2 ** map_bits number of
+ * elements (internally maintained as 'max_elts' in struct
+ * tracing_map). Before using, map fields should be added to the map
+ * with tracing_map_add_sum_field() and tracing_map_add_key_field().
+ * tracing_map_init() should then be called to allocate the array of
+ * tracing_map_elts, in order to avoid allocating anything in the map
+ * insertion path. The user-specified map size reflects the maximum
+ * number of elements that can be contained in the table requested by
+ * the user - internally we double that in order to keep the table
+ * sparse and keep collisions manageable.
+ *
+ * A tracing_map is a special-purpose map designed to aggregate or
+ * 'sum' one or more values associated with a specific object of type
+ * tracing_map_elt, which is attached by the map to a given key.
+ *
+ * tracing_map_create() sets up the map itself, and provides
+ * operations for inserting tracing_map_elts, but doesn't allocate the
+ * tracing_map_elts themselves, or provide a means for describing the
+ * keys or sums associated with the tracing_map_elts. All
+ * tracing_map_elts for a given map have the same set of sums and
+ * keys, which are defined by the client using the functions
+ * tracing_map_add_key_field() and tracing_map_add_sum_field(). Once
+ * the fields are defined, the pool of elements allocated for the map
+ * can be created, which occurs when the client code calls
+ * tracing_map_init().
+ *
+ * When tracing_map_init() returns, tracing_map_elt elements can be
+ * inserted into the map using tracing_map_insert(). When called,
+ * tracing_map_insert() grabs a free tracing_map_elt from the pool, or
+ * finds an existing match in the map and in either case returns it.
+ * The client can then use tracing_map_update_sum() and
+ * tracing_map_read_sum() to update or read a given sum field for the
+ * tracing_map_elt.
+ *
+ * The client can at any point retrieve and traverse the current set
+ * of inserted tracing_map_elts in a tracing_map, via
+ * tracing_map_sort_entries(). Sorting can be done on any field,
+ * including keys.
+ *
+ * See tracing_map.h for a description of tracing_map_ops.
+ *
+ * Return: the tracing_map pointer if successful, ERR_PTR if not.
+ */
+struct tracing_map *tracing_map_create(unsigned int map_bits,
+ unsigned int key_size,
+ const struct tracing_map_ops *ops,
+ void *private_data)
+{
+ struct tracing_map *map;
+ unsigned int i;
+
+ if (map_bits < TRACING_MAP_BITS_MIN ||
+ map_bits > TRACING_MAP_BITS_MAX)
+ return ERR_PTR(-EINVAL);
+
+ map = kzalloc(sizeof(*map), GFP_KERNEL);
+ if (!map)
+ return ERR_PTR(-ENOMEM);
+
+ map->map_bits = map_bits;
+ map->max_elts = (1 << map_bits);
+ atomic_set(&map->next_elt, -1);
+
+ map->map_size = (1 << (map_bits + 1));
+ map->ops = ops;
+
+ map->private_data = private_data;
+
+ map->map = tracing_map_array_alloc(map->map_size,
+ sizeof(struct tracing_map_entry));
+ if (!map->map)
+ goto free;
+
+ map->key_size = key_size;
+ for (i = 0; i < TRACING_MAP_KEYS_MAX; i++)
+ map->key_idx[i] = -1;
+ out:
+ return map;
+ free:
+ tracing_map_destroy(map);
+ map = ERR_PTR(-ENOMEM);
+
+ goto out;
+}
+
+/**
+ * tracing_map_init - Allocate and clear a map's tracing_map_elts
+ * @map: The tracing_map to initialize
+ *
+ * Allocates a clears a pool of tracing_map_elts equal to the
+ * user-specified size of 2 ** map_bits (internally maintained as
+ * 'max_elts' in struct tracing_map). Before using, the map fields
+ * should be added to the map with tracing_map_add_sum_field() and
+ * tracing_map_add_key_field(). tracing_map_init() should then be
+ * called to allocate the array of tracing_map_elts, in order to avoid
+ * allocating anything in the map insertion path. The user-specified
+ * map size reflects the max number of elements requested by the user
+ * - internally we double that in order to keep the table sparse and
+ * keep collisions manageable.
+ *
+ * See tracing_map.h for a description of tracing_map_ops.
+ *
+ * Return: the tracing_map pointer if successful, ERR_PTR if not.
+ */
+int tracing_map_init(struct tracing_map *map)
+{
+ int err;
+
+ if (map->n_fields < 2)
+ return -EINVAL; /* need at least 1 key and 1 val */
+
+ err = tracing_map_alloc_elts(map);
+ if (err)
+ return err;
+
+ tracing_map_clear(map);
+
+ return err;
+}
+
+static int cmp_entries_dup(const struct tracing_map_sort_entry **a,
+ const struct tracing_map_sort_entry **b)
+{
+ int ret = 0;
+
+ if (memcmp((*a)->key, (*b)->key, (*a)->elt->map->key_size))
+ ret = 1;
+
+ return ret;
+}
+
+static int cmp_entries_sum(const struct tracing_map_sort_entry **a,
+ const struct tracing_map_sort_entry **b)
+{
+ const struct tracing_map_elt *elt_a, *elt_b;
+ struct tracing_map_sort_key *sort_key;
+ struct tracing_map_field *field;
+ tracing_map_cmp_fn_t cmp_fn;
+ void *val_a, *val_b;
+ int ret = 0;
+
+ elt_a = (*a)->elt;
+ elt_b = (*b)->elt;
+
+ sort_key = &elt_a->map->sort_key;
+
+ field = &elt_a->fields[sort_key->field_idx];
+ cmp_fn = field->cmp_fn;
+
+ val_a = &elt_a->fields[sort_key->field_idx].sum;
+ val_b = &elt_b->fields[sort_key->field_idx].sum;
+
+ ret = cmp_fn(val_a, val_b);
+ if (sort_key->descending)
+ ret = -ret;
+
+ return ret;
+}
+
+static int cmp_entries_key(const struct tracing_map_sort_entry **a,
+ const struct tracing_map_sort_entry **b)
+{
+ const struct tracing_map_elt *elt_a, *elt_b;
+ struct tracing_map_sort_key *sort_key;
+ struct tracing_map_field *field;
+ tracing_map_cmp_fn_t cmp_fn;
+ void *val_a, *val_b;
+ int ret = 0;
+
+ elt_a = (*a)->elt;
+ elt_b = (*b)->elt;
+
+ sort_key = &elt_a->map->sort_key;
+
+ field = &elt_a->fields[sort_key->field_idx];
+
+ cmp_fn = field->cmp_fn;
+
+ val_a = elt_a->key + field->offset;
+ val_b = elt_b->key + field->offset;
+
+ ret = cmp_fn(val_a, val_b);
+ if (sort_key->descending)
+ ret = -ret;
+
+ return ret;
+}
+
+static void destroy_sort_entry(struct tracing_map_sort_entry *entry)
+{
+ if (!entry)
+ return;
+
+ if (entry->elt_copied)
+ tracing_map_elt_free(entry->elt);
+
+ kfree(entry);
+}
+
+/**
+ * tracing_map_destroy_sort_entries - Destroy an array of sort entries
+ * @entries: The entries to destroy
+ * @n_entries: The number of entries in the array
+ *
+ * Destroy the elements returned by a tracing_map_sort_entries() call.
+ */
+void tracing_map_destroy_sort_entries(struct tracing_map_sort_entry **entries,
+ unsigned int n_entries)
+{
+ unsigned int i;
+
+ for (i = 0; i < n_entries; i++)
+ destroy_sort_entry(entries[i]);
+
+ vfree(entries);
+}
+
+static struct tracing_map_sort_entry *
+create_sort_entry(void *key, struct tracing_map_elt *elt)
+{
+ struct tracing_map_sort_entry *sort_entry;
+
+ sort_entry = kzalloc(sizeof(*sort_entry), GFP_KERNEL);
+ if (!sort_entry)
+ return NULL;
+
+ sort_entry->key = key;
+ sort_entry->elt = elt;
+
+ return sort_entry;
+}
+
+static struct tracing_map_elt *copy_elt(struct tracing_map_elt *elt)
+{
+ struct tracing_map_elt *dup_elt;
+ unsigned int i;
+
+ dup_elt = tracing_map_elt_alloc(elt->map);
+ if (!dup_elt)
+ return NULL;
+
+ if (elt->map->ops && elt->map->ops->elt_copy)
+ elt->map->ops->elt_copy(dup_elt, elt);
+
+ dup_elt->private_data = elt->private_data;
+ memcpy(dup_elt->key, elt->key, elt->map->key_size);
+
+ for (i = 0; i < elt->map->n_fields; i++) {
+ atomic64_set(&dup_elt->fields[i].sum,
+ atomic64_read(&elt->fields[i].sum));
+ dup_elt->fields[i].cmp_fn = elt->fields[i].cmp_fn;
+ }
+
+ return dup_elt;
+}
+
+static int merge_dup(struct tracing_map_sort_entry **sort_entries,
+ unsigned int target, unsigned int dup)
+{
+ struct tracing_map_elt *target_elt, *elt;
+ bool first_dup = (target - dup) == 1;
+ int i;
+
+ if (first_dup) {
+ elt = sort_entries[target]->elt;
+ target_elt = copy_elt(elt);
+ if (!target_elt)
+ return -ENOMEM;
+ sort_entries[target]->elt = target_elt;
+ sort_entries[target]->elt_copied = true;
+ } else
+ target_elt = sort_entries[target]->elt;
+
+ elt = sort_entries[dup]->elt;
+
+ for (i = 0; i < elt->map->n_fields; i++)
+ atomic64_add(atomic64_read(&elt->fields[i].sum),
+ &target_elt->fields[i].sum);
+
+ sort_entries[dup]->dup = true;
+
+ return 0;
+}
+
+static int merge_dups(struct tracing_map_sort_entry **sort_entries,
+ int n_entries, unsigned int key_size)
+{
+ unsigned int dups = 0, total_dups = 0;
+ int err, i, j;
+ void *key;
+
+ if (n_entries < 2)
+ return total_dups;
+
+ sort(sort_entries, n_entries, sizeof(struct tracing_map_sort_entry *),
+ (int (*)(const void *, const void *))cmp_entries_dup, NULL);
+
+ key = sort_entries[0]->key;
+ for (i = 1; i < n_entries; i++) {
+ if (!memcmp(sort_entries[i]->key, key, key_size)) {
+ dups++; total_dups++;
+ err = merge_dup(sort_entries, i - dups, i);
+ if (err)
+ return err;
+ continue;
+ }
+ key = sort_entries[i]->key;
+ dups = 0;
+ }
+
+ if (!total_dups)
+ return total_dups;
+
+ for (i = 0, j = 0; i < n_entries; i++) {
+ if (!sort_entries[i]->dup) {
+ sort_entries[j] = sort_entries[i];
+ if (j++ != i)
+ sort_entries[i] = NULL;
+ } else {
+ destroy_sort_entry(sort_entries[i]);
+ sort_entries[i] = NULL;
+ }
+ }
+
+ return total_dups;
+}
+
+static bool is_key(struct tracing_map *map, unsigned int field_idx)
+{
+ unsigned int i;
+
+ for (i = 0; i < map->n_keys; i++)
+ if (map->key_idx[i] == field_idx)
+ return true;
+ return false;
+}
+
+static void sort_secondary(struct tracing_map *map,
+ const struct tracing_map_sort_entry **entries,
+ unsigned int n_entries,
+ struct tracing_map_sort_key *primary_key,
+ struct tracing_map_sort_key *secondary_key)
+{
+ int (*primary_fn)(const struct tracing_map_sort_entry **,
+ const struct tracing_map_sort_entry **);
+ int (*secondary_fn)(const struct tracing_map_sort_entry **,
+ const struct tracing_map_sort_entry **);
+ unsigned i, start = 0, n_sub = 1;
+
+ if (is_key(map, primary_key->field_idx))
+ primary_fn = cmp_entries_key;
+ else
+ primary_fn = cmp_entries_sum;
+
+ if (is_key(map, secondary_key->field_idx))
+ secondary_fn = cmp_entries_key;
+ else
+ secondary_fn = cmp_entries_sum;
+
+ for (i = 0; i < n_entries - 1; i++) {
+ const struct tracing_map_sort_entry **a = &entries[i];
+ const struct tracing_map_sort_entry **b = &entries[i + 1];
+
+ if (primary_fn(a, b) == 0) {
+ n_sub++;
+ if (i < n_entries - 2)
+ continue;
+ }
+
+ if (n_sub < 2) {
+ start = i + 1;
+ n_sub = 1;
+ continue;
+ }
+
+ set_sort_key(map, secondary_key);
+ sort(&entries[start], n_sub,
+ sizeof(struct tracing_map_sort_entry *),
+ (int (*)(const void *, const void *))secondary_fn, NULL);
+ set_sort_key(map, primary_key);
+
+ start = i + 1;
+ n_sub = 1;
+ }
+}
+
+/**
+ * tracing_map_sort_entries - Sort the current set of tracing_map_elts in a map
+ * @map: The tracing_map
+ * @sort_key: The sort key to use for sorting
+ * @sort_entries: outval: pointer to allocated and sorted array of entries
+ *
+ * tracing_map_sort_entries() sorts the current set of entries in the
+ * map and returns the list of tracing_map_sort_entries containing
+ * them to the client in the sort_entries param. The client can
+ * access the struct tracing_map_elt element of interest directly as
+ * the 'elt' field of a returned struct tracing_map_sort_entry object.
+ *
+ * The sort_key has only two fields: idx and descending. 'idx' refers
+ * to the index of the field added via tracing_map_add_sum_field() or
+ * tracing_map_add_key_field() when the tracing_map was initialized.
+ * 'descending' is a flag that if set reverses the sort order, which
+ * by default is ascending.
+ *
+ * The client should not hold on to the returned array but should use
+ * it and call tracing_map_destroy_sort_entries() when done.
+ *
+ * Return: the number of sort_entries in the struct tracing_map_sort_entry
+ * array, negative on error
+ */
+int tracing_map_sort_entries(struct tracing_map *map,
+ struct tracing_map_sort_key *sort_keys,
+ unsigned int n_sort_keys,
+ struct tracing_map_sort_entry ***sort_entries)
+{
+ int (*cmp_entries_fn)(const struct tracing_map_sort_entry **,
+ const struct tracing_map_sort_entry **);
+ struct tracing_map_sort_entry *sort_entry, **entries;
+ int i, n_entries, ret;
+
+ entries = vmalloc(map->max_elts * sizeof(sort_entry));
+ if (!entries)
+ return -ENOMEM;
+
+ for (i = 0, n_entries = 0; i < map->map_size; i++) {
+ struct tracing_map_entry *entry;
+
+ entry = TRACING_MAP_ENTRY(map->map, i);
+
+ if (!entry->key || !entry->val)
+ continue;
+
+ entries[n_entries] = create_sort_entry(entry->val->key,
+ entry->val);
+ if (!entries[n_entries++]) {
+ ret = -ENOMEM;
+ goto free;
+ }
+ }
+
+ if (n_entries == 0) {
+ ret = 0;
+ goto free;
+ }
+
+ if (n_entries == 1) {
+ *sort_entries = entries;
+ return 1;
+ }
+
+ ret = merge_dups(entries, n_entries, map->key_size);
+ if (ret < 0)
+ goto free;
+ n_entries -= ret;
+
+ if (is_key(map, sort_keys[0].field_idx))
+ cmp_entries_fn = cmp_entries_key;
+ else
+ cmp_entries_fn = cmp_entries_sum;
+
+ set_sort_key(map, &sort_keys[0]);
+
+ sort(entries, n_entries, sizeof(struct tracing_map_sort_entry *),
+ (int (*)(const void *, const void *))cmp_entries_fn, NULL);
+
+ if (n_sort_keys > 1)
+ sort_secondary(map,
+ (const struct tracing_map_sort_entry **)entries,
+ n_entries,
+ &sort_keys[0],
+ &sort_keys[1]);
+
+ *sort_entries = entries;
+
+ return n_entries;
+ free:
+ tracing_map_destroy_sort_entries(entries, n_entries);
+
+ return ret;
+}
diff --git a/kernel/trace/tracing_map.h b/kernel/trace/tracing_map.h
new file mode 100644
index 0000000..7571825
--- /dev/null
+++ b/kernel/trace/tracing_map.h
@@ -0,0 +1,282 @@
+#ifndef __TRACING_MAP_H
+#define __TRACING_MAP_H
+
+#define TRACING_MAP_BITS_DEFAULT 11
+#define TRACING_MAP_BITS_MAX 17
+#define TRACING_MAP_BITS_MIN 7
+
+#define TRACING_MAP_FIELDS_MAX 4
+#define TRACING_MAP_KEYS_MAX 2
+
+#define TRACING_MAP_SORT_KEYS_MAX 2
+
+typedef int (*tracing_map_cmp_fn_t) (void *val_a, void *val_b);
+
+/*
+ * This is an overview of the tracing_map data structures and how they
+ * relate to the tracing_map API. The details of the algorithms
+ * aren't discussed here - this is just a general overview of the data
+ * structures and how they interact with the API.
+ *
+ * The central data structure of the tracing_map is an initially
+ * zeroed array of struct tracing_map_entry (stored in the map field
+ * of struct tracing_map). tracing_map_entry is a very simple data
+ * structure containing only two fields: a 32-bit unsigned 'key'
+ * variable and a pointer named 'val'. This array of struct
+ * tracing_map_entry is essentially a hash table which will be
+ * modified by a single function, tracing_map_insert(), but which can
+ * be traversed and read by a user at any time (though the user does
+ * this indirectly via an array of tracing_map_sort_entry - see the
+ * explanation of that data structure in the discussion of the
+ * sorting-related data structures below).
+ *
+ * The central function of the tracing_map API is
+ * tracing_map_insert(). tracing_map_insert() hashes the
+ * arbitrarily-sized key passed into it into a 32-bit unsigned key.
+ * It then uses this key, truncated to the array size, as an index
+ * into the array of tracing_map_entries. If the value of the 'key'
+ * field of the tracing_map_entry found at that location is 0, then
+ * that entry is considered to be free and can be claimed, by
+ * replacing the 0 in the 'key' field of the tracing_map_entry with
+ * the new 32-bit hashed key. Once claimed, that tracing_map_entry's
+ * 'val' field is then used to store a unique element which will be
+ * forever associated with that 32-bit hashed key in the
+ * tracing_map_entry.
+ *
+ * That unique element now in the tracing_map_entry's 'val' field is
+ * an instance of tracing_map_elt, where 'elt' in the latter part of
+ * that variable name is short for 'element'. The purpose of a
+ * tracing_map_elt is to hold values specific to the the particular
+ * 32-bit hashed key it's assocated with. Things such as the unique
+ * set of aggregated sums associated with the 32-bit hashed key, along
+ * with a copy of the full key associated with the entry, and which
+ * was used to produce the 32-bit hashed key.
+ *
+ * When tracing_map_create() is called to create the tracing map, the
+ * user specifies (indirectly via the map_bits param, the details are
+ * unimportant for this discussion) the maximum number of elements
+ * that the map can hold (stored in the max_elts field of struct
+ * tracing_map). This is the maximum possible number of
+ * tracing_map_entries in the tracing_map_entry array which can be
+ * 'claimed' as described in the above discussion, and therefore is
+ * also the maximum number of tracing_map_elts that can be associated
+ * with the tracing_map_entry array in the tracing_map. Because of
+ * the way the insertion algorithm works, the size of the allocated
+ * tracing_map_entry array is always twice the maximum number of
+ * elements (2 * max_elts). This value is stored in the map_size
+ * field of struct tracing_map.
+ *
+ * Because tracing_map_insert() needs to work from any context,
+ * including from within the memory allocation functions themselves,
+ * both the tracing_map_entry array and a pool of max_elts
+ * tracing_map_elts are pre-allocated before any call is made to
+ * tracing_map_insert().
+ *
+ * The tracing_map_entry array is allocated as a single block by
+ * tracing_map_create().
+ *
+ * Because the tracing_map_elts are much larger objects and can't
+ * generally be allocated together as a single large array without
+ * failure, they're allocated individually, by tracing_map_init().
+ *
+ * The pool of tracing_map_elts are allocated by tracing_map_init()
+ * rather than by tracing_map_create() because at the time
+ * tracing_map_create() is called, there isn't enough information to
+ * create the tracing_map_elts. Specifically,the user first needs to
+ * tell the tracing_map implementation how many fields the
+ * tracing_map_elts contain, and which types of fields they are (key
+ * or sum). The user does this via the tracing_map_add_sum_field()
+ * and tracing_map_add_key_field() functions, following which the user
+ * calls tracing_map_init() to finish up the tracing map setup. The
+ * array holding the pointers which make up the pre-allocated pool of
+ * tracing_map_elts is allocated as a single block and is stored in
+ * the elts field of struct tracing_map.
+ *
+ * There is also a set of structures used for sorting that might
+ * benefit from some minimal explanation.
+ *
+ * struct tracing_map_sort_key is used to drive the sort at any given
+ * time. By 'any given time' we mean that a different
+ * tracing_map_sort_key will be used at different times depending on
+ * whether the sort currently being performed is a primary or a
+ * secondary sort.
+ *
+ * The sort key is very simple, consisting of the field index of the
+ * tracing_map_elt field to sort on (which the user saved when adding
+ * the field), and whether the sort should be done in an ascending or
+ * descending order.
+ *
+ * For the convenience of the sorting code, a tracing_map_sort_entry
+ * is created for each tracing_map_elt, again individually allocated
+ * to avoid failures that might be expected if allocated as a single
+ * large array of struct tracing_map_sort_entry.
+ * tracing_map_sort_entry instances are the objects expected by the
+ * various internal sorting functions, and are also what the user
+ * ultimately receives after calling tracing_map_sort_entries().
+ * Because it doesn't make sense for users to access an unordered and
+ * sparsely populated tracing_map directly, the
+ * tracing_map_sort_entries() function is provided so that users can
+ * retrieve a sorted list of all existing elements. In addition to
+ * the associated tracing_map_elt 'elt' field contained within the
+ * tracing_map_sort_entry, which is the object of interest to the
+ * user, tracing_map_sort_entry objects contain a number of additional
+ * fields which are used for caching and internal purposes and can
+ * safely be ignored.
+*/
+
+struct tracing_map_field {
+ tracing_map_cmp_fn_t cmp_fn;
+ union {
+ atomic64_t sum;
+ unsigned int offset;
+ };
+};
+
+struct tracing_map_elt {
+ struct tracing_map *map;
+ struct tracing_map_field *fields;
+ void *key;
+ void *private_data;
+};
+
+struct tracing_map_entry {
+ u32 key;
+ struct tracing_map_elt *val;
+};
+
+struct tracing_map_sort_key {
+ unsigned int field_idx;
+ bool descending;
+};
+
+struct tracing_map_sort_entry {
+ void *key;
+ struct tracing_map_elt *elt;
+ bool elt_copied;
+ bool dup;
+};
+
+struct tracing_map_array {
+ unsigned int entries_per_page;
+ unsigned int entry_size_shift;
+ unsigned int entry_shift;
+ unsigned int entry_mask;
+ unsigned int n_pages;
+ void **pages;
+};
+
+#define TRACING_MAP_ARRAY_ELT(array, idx) \
+ (array->pages[idx >> array->entry_shift] + \
+ ((idx & array->entry_mask) << array->entry_size_shift))
+
+#define TRACING_MAP_ENTRY(array, idx) \
+ ((struct tracing_map_entry *)TRACING_MAP_ARRAY_ELT(array, idx))
+
+#define TRACING_MAP_ELT(array, idx) \
+ ((struct tracing_map_elt **)TRACING_MAP_ARRAY_ELT(array, idx))
+
+struct tracing_map {
+ unsigned int key_size;
+ unsigned int map_bits;
+ unsigned int map_size;
+ unsigned int max_elts;
+ atomic_t next_elt;
+ struct tracing_map_array *elts;
+ struct tracing_map_array *map;
+ const struct tracing_map_ops *ops;
+ void *private_data;
+ struct tracing_map_field fields[TRACING_MAP_FIELDS_MAX];
+ unsigned int n_fields;
+ int key_idx[TRACING_MAP_KEYS_MAX];
+ unsigned int n_keys;
+ struct tracing_map_sort_key sort_key;
+ atomic64_t hits;
+ atomic64_t drops;
+};
+
+/**
+ * struct tracing_map_ops - callbacks for tracing_map
+ *
+ * The methods in this structure define callback functions for various
+ * operations on a tracing_map or objects related to a tracing_map.
+ *
+ * For a detailed description of tracing_map_elt objects please see
+ * the overview of tracing_map data structures at the beginning of
+ * this file.
+ *
+ * All the methods below are optional.
+ *
+ * @elt_alloc: When a tracing_map_elt is allocated, this function, if
+ * defined, will be called and gives clients the opportunity to
+ * allocate additional data and attach it to the element
+ * (tracing_map_elt->private_data is meant for that purpose).
+ * Element allocation occurs before tracing begins, when the
+ * tracing_map_init() call is made by client code.
+ *
+ * @elt_copy: At certain points in the lifetime of an element, it may
+ * need to be copied. The copy should include a copy of the
+ * client-allocated data, which can be copied into the 'to'
+ * element from the 'from' element.
+ *
+ * @elt_free: When a tracing_map_elt is freed, this function is called
+ * and allows client-allocated per-element data to be freed.
+ *
+ * @elt_clear: This callback allows per-element client-defined data to
+ * be cleared, if applicable.
+ *
+ * @elt_init: This callback allows per-element client-defined data to
+ * be initialized when used i.e. when the element is actually
+ * claimed by tracing_map_insert() in the context of the map
+ * insertion.
+ */
+struct tracing_map_ops {
+ int (*elt_alloc)(struct tracing_map_elt *elt);
+ void (*elt_copy)(struct tracing_map_elt *to,
+ struct tracing_map_elt *from);
+ void (*elt_free)(struct tracing_map_elt *elt);
+ void (*elt_clear)(struct tracing_map_elt *elt);
+ void (*elt_init)(struct tracing_map_elt *elt);
+};
+
+extern struct tracing_map *
+tracing_map_create(unsigned int map_bits,
+ unsigned int key_size,
+ const struct tracing_map_ops *ops,
+ void *private_data);
+extern int tracing_map_init(struct tracing_map *map);
+
+extern int tracing_map_add_sum_field(struct tracing_map *map);
+extern int tracing_map_add_key_field(struct tracing_map *map,
+ unsigned int offset,
+ tracing_map_cmp_fn_t cmp_fn);
+
+extern void tracing_map_destroy(struct tracing_map *map);
+extern void tracing_map_clear(struct tracing_map *map);
+
+extern struct tracing_map_elt *
+tracing_map_insert(struct tracing_map *map, void *key);
+extern struct tracing_map_elt *
+tracing_map_lookup(struct tracing_map *map, void *key);
+
+extern tracing_map_cmp_fn_t tracing_map_cmp_num(int field_size,
+ int field_is_signed);
+extern int tracing_map_cmp_string(void *val_a, void *val_b);
+extern int tracing_map_cmp_none(void *val_a, void *val_b);
+
+extern void tracing_map_update_sum(struct tracing_map_elt *elt,
+ unsigned int i, u64 n);
+extern u64 tracing_map_read_sum(struct tracing_map_elt *elt, unsigned int i);
+extern void tracing_map_set_field_descr(struct tracing_map *map,
+ unsigned int i,
+ unsigned int key_offset,
+ tracing_map_cmp_fn_t cmp_fn);
+extern int
+tracing_map_sort_entries(struct tracing_map *map,
+ struct tracing_map_sort_key *sort_keys,
+ unsigned int n_sort_keys,
+ struct tracing_map_sort_entry ***sort_entries);
+
+extern void
+tracing_map_destroy_sort_entries(struct tracing_map_sort_entry **entries,
+ unsigned int n_entries);
+#endif /* __TRACING_MAP_H */
--
1.9.3
'hist' triggers allow users to continually aggregate trace events,
which can then be viewed afterwards by simply reading a 'hist' file
containing the aggregation in a human-readable format.
The basic idea is very simple and boils down to a mechanism whereby
trace events, rather than being exhaustively dumped in raw form and
viewed directly, are automatically 'compressed' into meaningful tables
completely defined by the user.
This is done strictly via single-line command-line commands and
without the aid of any kind of programming language or interpreter.
A surprising number of typical use cases can be accomplished by users
via this simple mechanism. In fact, a large number of the tasks that
users typically do using the more complicated script-based tracing
tools, at least during the initial stages of an investigation, can be
accomplished by simply specifying a set of keys and values to be used
in the creation of a hash table.
The Linux kernel trace event subsystem happens to provide an extensive
list of keys and values ready-made for such a purpose in the form of
the event format files associated with each trace event. By simply
consulting the format file for field names of interest and by plugging
them into the hist trigger command, users can create an endless number
of useful aggregations to help with investigating various properties
of the system. See Documentation/trace/events.txt for examples.
hist triggers are implemented on top of the existing event trigger
infrastructure, and as such are consistent with the existing triggers
from a user's perspective as well.
The basic syntax follows the existing trigger syntax. Users start an
aggregation by writing a 'hist' trigger to the event of interest's
trigger file:
# echo hist:keys=xxx [ if filter] > event/trigger
Once a hist trigger has been set up, by default it continually
aggregates every matching event into a hash table using the event key
and a value field named 'hitcount'.
To view the aggregation at any point in time, simply read the 'hist'
file in the same directory as the 'trigger' file:
# cat event/hist
The detailed syntax provides additional options for user control, and
is described exhaustively in Documentation/trace/events.txt and in the
virtual tracing/README file in the tracing subsystem.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
include/linux/trace_events.h | 1 +
kernel/trace/Kconfig | 14 +
kernel/trace/Makefile | 1 +
kernel/trace/trace.c | 17 +
kernel/trace/trace.h | 7 +
kernel/trace/trace_events.c | 4 +
kernel/trace/trace_events_hist.c | 839 ++++++++++++++++++++++++++++++++++++
kernel/trace/trace_events_trigger.c | 1 +
8 files changed, 884 insertions(+)
create mode 100644 kernel/trace/trace_events_hist.c
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index 95e8fef..e61816d 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -417,6 +417,7 @@ enum event_trigger_type {
ETT_SNAPSHOT = (1 << 1),
ETT_STACKTRACE = (1 << 2),
ETT_EVENT_ENABLE = (1 << 3),
+ ETT_EVENT_HIST = (1 << 4),
};
extern int filter_match_preds(struct event_filter *filter, void *rec);
diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
index 0c61e98..fecfef7 100644
--- a/kernel/trace/Kconfig
+++ b/kernel/trace/Kconfig
@@ -539,6 +539,20 @@ config TRACING_MAP
generally used outside of that context, and is normally
selected by tracers that use it.
+config HIST_TRIGGERS
+ bool "Histogram triggers"
+ depends on ARCH_HAVE_NMI_SAFE_CMPXCHG
+ select TRACING_MAP
+ default n
+ help
+ Hist triggers allow one or more arbitrary trace event fields
+ to be aggregated into hash tables and dumped to stdout by
+ reading a debugfs/tracefs file. They're useful for
+ gathering quick and dirty (though precise) summaries of
+ event activity as an initial guide for further investigation
+ using more advanced tools.
+
+ See Documentation/trace/events.txt.
If in doubt, say N.
config MMIOTRACE_TEST
diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
index 4255c40..979e7bf 100644
--- a/kernel/trace/Makefile
+++ b/kernel/trace/Makefile
@@ -54,6 +54,7 @@ obj-$(CONFIG_EVENT_TRACING) += trace_event_perf.o
endif
obj-$(CONFIG_EVENT_TRACING) += trace_events_filter.o
obj-$(CONFIG_EVENT_TRACING) += trace_events_trigger.o
+obj-$(CONFIG_HIST_TRIGGERS) += trace_events_hist.o
obj-$(CONFIG_BPF_EVENTS) += bpf_trace.o
obj-$(CONFIG_KPROBE_EVENT) += trace_kprobe.o
obj-$(CONFIG_TRACEPOINTS) += power-traces.o
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 87fb980..078db8f 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3804,6 +3804,9 @@ static const char readme_msg[] =
#ifdef CONFIG_TRACER_SNAPSHOT
"\t\t snapshot\n"
#endif
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t\t hist (see below)\n"
+#endif
"\t example: echo traceoff > events/block/block_unplug/trigger\n"
"\t echo traceoff:3 > events/block/block_unplug/trigger\n"
"\t echo 'enable_event:kmem:kmalloc:3 if nr_rq > 1' > \\\n"
@@ -3819,6 +3822,20 @@ static const char readme_msg[] =
"\t To remove a trigger with a count:\n"
"\t echo '!<trigger>:0 > <system>/<event>/trigger\n"
"\t Filters can be ignored when removing a trigger.\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ " hist trigger\t- If set, event hits are aggregated into a hash table\n"
+ "\t Format: hist:keys=<field1>\n"
+ "\t [:size=#entries]\n"
+ "\t [if <filter>]\n\n"
+ "\t When a matching event is hit, an entry is added to a hash\n"
+ "\t table using the key named, and the value of a sum called\n"
+ "\t 'hitcount' is incremented. Keys correspond to fields in the\n"
+ "\t event's format description. Keys can be any field. The\n"
+ "\t 'size' parameter can be used to specify more or fewer than\n"
+ "\t the default 2048 entries for the hashtable size.\n\n"
+ "\t Reading the 'hist' file for the event will dump the hash\n"
+ "\t table in its entirety to stdout."
+#endif
;
static ssize_t
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 2028e98..a2a6793 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1161,6 +1161,13 @@ extern struct mutex event_mutex;
extern struct list_head ftrace_events;
extern const struct file_operations event_trigger_fops;
+extern const struct file_operations event_hist_fops;
+
+#ifdef CONFIG_HIST_TRIGGERS
+extern int register_trigger_hist_cmd(void);
+#else
+static inline int register_trigger_hist_cmd(void) { return 0; }
+#endif
extern int register_trigger_cmds(void);
extern void clear_event_triggers(struct trace_array *tr);
diff --git a/kernel/trace/trace_events.c b/kernel/trace/trace_events.c
index bee1e15..abdc63f 100644
--- a/kernel/trace/trace_events.c
+++ b/kernel/trace/trace_events.c
@@ -2091,6 +2091,10 @@ event_create_dir(struct dentry *parent, struct trace_event_file *file)
trace_create_file("trigger", 0644, file->dir, file,
&event_trigger_fops);
+#ifdef CONFIG_HIST_TRIGGERS
+ trace_create_file("hist", 0444, file->dir, file,
+ &event_hist_fops);
+#endif
trace_create_file("format", 0444, file->dir, call,
&ftrace_event_format_fops);
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
new file mode 100644
index 0000000..3c86ab2
--- /dev/null
+++ b/kernel/trace/trace_events_hist.c
@@ -0,0 +1,839 @@
+/*
+ * trace_events_hist - trace event hist triggers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * Copyright (C) 2015 Tom Zanussi <[email protected]>
+ */
+
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/stacktrace.h>
+
+#include "tracing_map.h"
+#include "trace.h"
+
+struct hist_field;
+
+typedef u64 (*hist_field_fn_t) (struct hist_field *field, void *event);
+
+struct hist_field {
+ struct ftrace_event_field *field;
+ unsigned long flags;
+ hist_field_fn_t fn;
+ unsigned int size;
+};
+
+static u64 hist_field_counter(struct hist_field *field, void *event)
+{
+ return 1;
+}
+
+static u64 hist_field_string(struct hist_field *hist_field, void *event)
+{
+ char *addr = (char *)(event + hist_field->field->offset);
+
+ return (u64)(unsigned long)addr;
+}
+
+#define DEFINE_HIST_FIELD_FN(type) \
+static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
+{ \
+ type *addr = (type *)(event + hist_field->field->offset); \
+ \
+ return (u64)*addr; \
+}
+
+DEFINE_HIST_FIELD_FN(s64);
+DEFINE_HIST_FIELD_FN(u64);
+DEFINE_HIST_FIELD_FN(s32);
+DEFINE_HIST_FIELD_FN(u32);
+DEFINE_HIST_FIELD_FN(s16);
+DEFINE_HIST_FIELD_FN(u16);
+DEFINE_HIST_FIELD_FN(s8);
+DEFINE_HIST_FIELD_FN(u8);
+
+#define for_each_hist_field(i, hist_data) \
+ for (i = 0; i < hist_data->n_fields; i++)
+
+#define for_each_hist_val_field(i, hist_data) \
+ for (i = 0; i < hist_data->n_vals; i++)
+
+#define for_each_hist_key_field(i, hist_data) \
+ for (i = hist_data->n_vals; i < hist_data->n_fields; i++)
+
+#define HITCOUNT_IDX 0
+#define HIST_KEY_MAX 1
+#define HIST_KEY_SIZE_MAX MAX_FILTER_STR_VAL
+
+enum hist_field_flags {
+ HIST_FIELD_HITCOUNT = 1,
+ HIST_FIELD_KEY = 2,
+ HIST_FIELD_STRING = 4,
+};
+
+struct hist_trigger_attrs {
+ char *keys_str;
+ unsigned int map_bits;
+};
+
+struct hist_trigger_data {
+ struct hist_field *fields[TRACING_MAP_FIELDS_MAX];
+ unsigned int n_vals;
+ unsigned int n_keys;
+ unsigned int n_fields;
+ unsigned int key_size;
+ struct tracing_map_sort_key sort_keys[TRACING_MAP_SORT_KEYS_MAX];
+ unsigned int n_sort_keys;
+ struct trace_event_file *event_file;
+ struct hist_trigger_attrs *attrs;
+ struct tracing_map *map;
+};
+
+static hist_field_fn_t select_value_fn(int field_size, int field_is_signed)
+{
+ hist_field_fn_t fn = NULL;
+
+ switch (field_size) {
+ case 8:
+ if (field_is_signed)
+ fn = hist_field_s64;
+ else
+ fn = hist_field_u64;
+ break;
+ case 4:
+ if (field_is_signed)
+ fn = hist_field_s32;
+ else
+ fn = hist_field_u32;
+ break;
+ case 2:
+ if (field_is_signed)
+ fn = hist_field_s16;
+ else
+ fn = hist_field_u16;
+ break;
+ case 1:
+ if (field_is_signed)
+ fn = hist_field_s8;
+ else
+ fn = hist_field_u8;
+ break;
+ }
+
+ return fn;
+}
+
+static int parse_map_size(char *str)
+{
+ unsigned long size, map_bits;
+ int ret;
+
+ strsep(&str, "=");
+ if (!str) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ ret = kstrtoul(str, 0, &size);
+ if (ret)
+ goto out;
+
+ map_bits = ilog2(roundup_pow_of_two(size));
+ if (map_bits < TRACING_MAP_BITS_MIN ||
+ map_bits > TRACING_MAP_BITS_MAX)
+ ret = -EINVAL;
+ else
+ ret = map_bits;
+ out:
+ return ret;
+}
+
+static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
+{
+ if (!attrs)
+ return;
+
+ kfree(attrs->keys_str);
+ kfree(attrs);
+}
+
+static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
+{
+ struct hist_trigger_attrs *attrs;
+ int ret = 0;
+
+ attrs = kzalloc(sizeof(*attrs), GFP_KERNEL);
+ if (!attrs)
+ return ERR_PTR(-ENOMEM);
+
+ while (trigger_str) {
+ char *str = strsep(&trigger_str, ":");
+
+ if (!strncmp(str, "keys", strlen("keys")) ||
+ !strncmp(str, "key", strlen("key")))
+ attrs->keys_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "size", strlen("size"))) {
+ int map_bits = parse_map_size(str);
+
+ if (map_bits < 0) {
+ ret = map_bits;
+ goto free;
+ }
+ attrs->map_bits = map_bits;
+ } else {
+ ret = -EINVAL;
+ goto free;
+ }
+ }
+
+ if (!attrs->keys_str) {
+ ret = -EINVAL;
+ goto free;
+ }
+
+ return attrs;
+ free:
+ destroy_hist_trigger_attrs(attrs);
+
+ return ERR_PTR(ret);
+}
+
+static void destroy_hist_field(struct hist_field *hist_field)
+{
+ kfree(hist_field);
+}
+
+static struct hist_field *create_hist_field(struct ftrace_event_field *field,
+ unsigned long flags)
+{
+ struct hist_field *hist_field;
+
+ if (field && is_function_field(field))
+ return NULL;
+
+ hist_field = kzalloc(sizeof(struct hist_field), GFP_KERNEL);
+ if (!hist_field)
+ return NULL;
+
+ if (flags & HIST_FIELD_HITCOUNT) {
+ hist_field->fn = hist_field_counter;
+ goto out;
+ }
+
+ if (is_string_field(field)) {
+ flags |= HIST_FIELD_STRING;
+ hist_field->fn = hist_field_string;
+ } else {
+ hist_field->fn = select_value_fn(field->size,
+ field->is_signed);
+ if (!hist_field->fn) {
+ destroy_hist_field(hist_field);
+ return NULL;
+ }
+ }
+ out:
+ hist_field->field = field;
+ hist_field->flags = flags;
+
+ return hist_field;
+}
+
+static void destroy_hist_fields(struct hist_trigger_data *hist_data)
+{
+ unsigned int i;
+
+ for_each_hist_field(i, hist_data) {
+ destroy_hist_field(hist_data->fields[i]);
+ hist_data->fields[i] = NULL;
+ }
+}
+
+static int create_hitcount_val(struct hist_trigger_data *hist_data)
+{
+ hist_data->fields[HITCOUNT_IDX] =
+ create_hist_field(NULL, HIST_FIELD_HITCOUNT);
+ if (!hist_data->fields[HITCOUNT_IDX])
+ return -ENOMEM;
+
+ hist_data->n_vals++;
+
+ return 0;
+}
+
+static int create_val_fields(struct hist_trigger_data *hist_data,
+ struct trace_event_file *file)
+{
+ int ret;
+
+ ret = create_hitcount_val(hist_data);
+
+ return ret;
+}
+
+static int create_key_field(struct hist_trigger_data *hist_data,
+ unsigned int key_idx,
+ struct trace_event_file *file,
+ char *field_str)
+{
+ struct ftrace_event_field *field = NULL;
+ unsigned long flags = 0;
+ unsigned int key_size;
+ int ret = 0;
+
+ flags |= HIST_FIELD_KEY;
+
+ field = trace_find_event_field(file->event_call, field_str);
+ if (!field) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ key_size = field->size;
+
+ hist_data->fields[key_idx] = create_hist_field(field, flags);
+ if (!hist_data->fields[key_idx]) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ key_size = ALIGN(key_size, sizeof(u64));
+ hist_data->fields[key_idx]->size = key_size;
+ hist_data->key_size = key_size;
+ if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ hist_data->n_keys++;
+ ret = key_size;
+ out:
+ return ret;
+}
+
+static int create_key_fields(struct hist_trigger_data *hist_data,
+ struct trace_event_file *file)
+{
+ unsigned int i, n_vals = hist_data->n_vals;
+ char *fields_str, *field_str;
+ int ret = -EINVAL;
+
+ fields_str = hist_data->attrs->keys_str;
+ if (!fields_str)
+ goto out;
+
+ strsep(&fields_str, "=");
+ if (!fields_str)
+ goto out;
+
+ for (i = n_vals; i < n_vals + HIST_KEY_MAX; i++) {
+ field_str = strsep(&fields_str, ",");
+ if (!field_str)
+ break;
+ ret = create_key_field(hist_data, i, file, field_str);
+ if (ret < 0)
+ goto out;
+ }
+ if (fields_str) {
+ ret = -EINVAL;
+ goto out;
+ }
+ ret = 0;
+ out:
+ return ret;
+}
+
+static int create_hist_fields(struct hist_trigger_data *hist_data,
+ struct trace_event_file *file)
+{
+ int ret;
+
+ ret = create_val_fields(hist_data, file);
+ if (ret)
+ goto out;
+
+ ret = create_key_fields(hist_data, file);
+ if (ret)
+ goto out;
+
+ hist_data->n_fields = hist_data->n_vals + hist_data->n_keys;
+ out:
+ return ret;
+}
+
+static int create_sort_keys(struct hist_trigger_data *hist_data)
+{
+ int ret = 0;
+
+ hist_data->n_sort_keys = 1; /* sort_keys[0] is always hitcount */
+
+ return ret;
+}
+
+static void destroy_hist_data(struct hist_trigger_data *hist_data)
+{
+ destroy_hist_trigger_attrs(hist_data->attrs);
+ destroy_hist_fields(hist_data);
+ tracing_map_destroy(hist_data->map);
+ kfree(hist_data);
+}
+
+static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
+{
+ struct tracing_map *map = hist_data->map;
+ struct ftrace_event_field *field;
+ struct hist_field *hist_field;
+ unsigned int i, idx;
+
+ for_each_hist_field(i, hist_data) {
+ hist_field = hist_data->fields[i];
+ if (hist_field->flags & HIST_FIELD_KEY) {
+ tracing_map_cmp_fn_t cmp_fn;
+
+ field = hist_field->field;
+
+ if (is_string_field(field))
+ cmp_fn = tracing_map_cmp_string;
+ else
+ cmp_fn = tracing_map_cmp_num(field->size,
+ field->is_signed);
+ idx = tracing_map_add_key_field(map, 0, cmp_fn);
+ } else
+ idx = tracing_map_add_sum_field(map);
+
+ if (idx < 0)
+ return idx;
+ }
+
+ return 0;
+}
+
+static struct hist_trigger_data *
+create_hist_data(unsigned int map_bits,
+ struct hist_trigger_attrs *attrs,
+ struct trace_event_file *file)
+{
+ struct hist_trigger_data *hist_data;
+ int ret = 0;
+
+ hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
+ if (!hist_data)
+ return ERR_PTR(-ENOMEM);
+
+ hist_data->attrs = attrs;
+
+ ret = create_hist_fields(hist_data, file);
+ if (ret < 0)
+ goto free;
+
+ ret = create_sort_keys(hist_data);
+ if (ret < 0)
+ goto free;
+
+ hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
+ NULL, hist_data);
+ if (IS_ERR(hist_data->map)) {
+ ret = PTR_ERR(hist_data->map);
+ hist_data->map = NULL;
+ goto free;
+ }
+
+ ret = create_tracing_map_fields(hist_data);
+ if (ret)
+ goto free;
+
+ ret = tracing_map_init(hist_data->map);
+ if (ret)
+ goto free;
+
+ hist_data->event_file = file;
+ out:
+ return hist_data;
+ free:
+ hist_data->attrs = NULL;
+
+ destroy_hist_data(hist_data);
+ if (ret)
+ hist_data = ERR_PTR(ret);
+ else
+ hist_data = NULL;
+
+ goto out;
+}
+
+static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
+ struct tracing_map_elt *elt,
+ void *rec)
+{
+ struct hist_field *hist_field;
+ unsigned int i;
+ u64 hist_val;
+
+ for_each_hist_val_field(i, hist_data) {
+ hist_field = hist_data->fields[i];
+ hist_val = hist_field->fn(hist_field, rec);
+ tracing_map_update_sum(elt, i, hist_val);
+ }
+}
+
+static void event_hist_trigger(struct event_trigger_data *data, void *rec)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+ struct hist_field *key_field;
+ struct tracing_map_elt *elt;
+ u64 field_contents;
+ void *key = NULL;
+ unsigned int i;
+
+ for_each_hist_key_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+
+ field_contents = key_field->fn(key_field, rec);
+ if (key_field->flags & HIST_FIELD_STRING)
+ key = (void *)(unsigned long)field_contents;
+ else
+ key = (void *)&field_contents;
+ }
+
+ elt = tracing_map_insert(hist_data->map, key);
+ if (elt)
+ hist_trigger_elt_update(hist_data, elt, rec);
+}
+
+static void
+hist_trigger_entry_print(struct seq_file *m,
+ struct hist_trigger_data *hist_data, void *key,
+ struct tracing_map_elt *elt)
+{
+ struct hist_field *key_field;
+ unsigned int i;
+ u64 uval;
+
+ seq_puts(m, "{ ");
+
+ for_each_hist_key_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+
+ if (i > hist_data->n_vals)
+ seq_puts(m, ", ");
+
+ if (key_field->flags & HIST_FIELD_STRING) {
+ seq_printf(m, "%s: %-50s", key_field->field->name,
+ (char *)key);
+ } else {
+ uval = *(u64 *)key;
+ seq_printf(m, "%s: %10llu",
+ key_field->field->name, uval);
+ }
+ }
+
+ seq_puts(m, " }");
+
+ seq_printf(m, " hitcount: %10llu",
+ tracing_map_read_sum(elt, HITCOUNT_IDX));
+
+ seq_puts(m, "\n");
+}
+
+static int print_entries(struct seq_file *m,
+ struct hist_trigger_data *hist_data)
+{
+ struct tracing_map_sort_entry **sort_entries = NULL;
+ struct tracing_map *map = hist_data->map;
+ unsigned int i, n_entries;
+
+ n_entries = tracing_map_sort_entries(map, hist_data->sort_keys,
+ hist_data->n_sort_keys,
+ &sort_entries);
+ if (n_entries < 0)
+ return n_entries;
+
+ for (i = 0; i < n_entries; i++)
+ hist_trigger_entry_print(m, hist_data,
+ sort_entries[i]->key,
+ sort_entries[i]->elt);
+
+ tracing_map_destroy_sort_entries(sort_entries, n_entries);
+
+ return n_entries;
+}
+
+static int hist_show(struct seq_file *m, void *v)
+{
+ struct event_trigger_data *test, *data = NULL;
+ struct trace_event_file *event_file;
+ struct hist_trigger_data *hist_data;
+ int n_entries, ret = 0;
+
+ mutex_lock(&event_mutex);
+
+ event_file = event_file_data(m->private);
+ if (unlikely(!event_file)) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ list_for_each_entry_rcu(test, &event_file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ data = test;
+ break;
+ }
+ }
+ if (!data)
+ goto out_unlock;
+
+ seq_puts(m, "# event histogram\n#\n# trigger info: ");
+ data->ops->print(m, data->ops, data);
+ seq_puts(m, "\n");
+
+ hist_data = data->private_data;
+ n_entries = print_entries(m, hist_data);
+ if (n_entries < 0) {
+ ret = n_entries;
+ n_entries = 0;
+ }
+
+ seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
+ (u64)atomic64_read(&hist_data->map->hits),
+ n_entries, (u64)atomic64_read(&hist_data->map->drops));
+ out_unlock:
+ mutex_unlock(&event_mutex);
+
+ return ret;
+}
+
+static int event_hist_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, hist_show, file);
+}
+
+const struct file_operations event_hist_fops = {
+ .open = event_hist_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+};
+
+static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
+{
+ seq_printf(m, "%s", hist_field->field->name);
+}
+
+static int event_hist_trigger_print(struct seq_file *m,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+ struct hist_field *key_field;
+ unsigned int i;
+
+ seq_puts(m, "hist:keys=");
+
+ for_each_hist_key_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+
+ if (i > hist_data->n_vals)
+ seq_puts(m, ",");
+
+ hist_field_print(m, key_field);
+ }
+
+ seq_puts(m, ":vals=");
+ seq_puts(m, "hitcount");
+
+ seq_puts(m, ":sort=");
+ seq_puts(m, "hitcount");
+
+ seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
+
+ if (data->filter_str)
+ seq_printf(m, " if %s", data->filter_str);
+
+ seq_puts(m, " [active]");
+
+ seq_putc(m, '\n');
+
+ return 0;
+}
+
+static void event_hist_trigger_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+
+ if (WARN_ON_ONCE(data->ref <= 0))
+ return;
+
+ data->ref--;
+ if (!data->ref) {
+ trigger_data_free(data);
+ destroy_hist_data(hist_data);
+ }
+}
+
+static struct event_trigger_ops event_hist_trigger_ops = {
+ .func = event_hist_trigger,
+ .print = event_hist_trigger_print,
+ .init = event_trigger_init,
+ .free = event_hist_trigger_free,
+};
+
+static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
+ char *param)
+{
+ return &event_hist_trigger_ops;
+}
+
+static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file)
+{
+ struct event_trigger_data *test;
+ int ret = 0;
+
+ list_for_each_entry_rcu(test, &file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ ret = -EEXIST;
+ goto out;
+ }
+ }
+
+ if (data->ops->init) {
+ ret = data->ops->init(data->ops, data);
+ if (ret < 0)
+ goto out;
+ }
+
+ list_add_rcu(&data->list, &file->triggers);
+ ret++;
+
+ update_cond_flag(file);
+ if (trace_event_trigger_enable_disable(file, 1) < 0) {
+ list_del_rcu(&data->list);
+ update_cond_flag(file);
+ ret--;
+ }
+ out:
+ return ret;
+}
+
+static int event_hist_trigger_func(struct event_command *cmd_ops,
+ struct trace_event_file *file,
+ char *glob, char *cmd, char *param)
+{
+ unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
+ struct event_trigger_data *trigger_data;
+ struct hist_trigger_attrs *attrs;
+ struct event_trigger_ops *trigger_ops;
+ struct hist_trigger_data *hist_data;
+ char *trigger;
+ int ret = 0;
+
+ if (!param)
+ return -EINVAL;
+
+ /* separate the trigger from the filter (k:v [if filter]) */
+ trigger = strsep(¶m, " \t");
+ if (!trigger)
+ return -EINVAL;
+
+ attrs = parse_hist_trigger_attrs(trigger);
+ if (IS_ERR(attrs))
+ return PTR_ERR(attrs);
+
+ if (attrs->map_bits)
+ hist_trigger_bits = attrs->map_bits;
+
+ hist_data = create_hist_data(hist_trigger_bits, attrs, file);
+ if (IS_ERR(hist_data)) {
+ destroy_hist_trigger_attrs(attrs);
+ return PTR_ERR(hist_data);
+ }
+
+ trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
+
+ ret = -ENOMEM;
+ trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
+ if (!trigger_data)
+ goto out_free;
+
+ trigger_data->count = -1;
+ trigger_data->ops = trigger_ops;
+ trigger_data->cmd_ops = cmd_ops;
+
+ INIT_LIST_HEAD(&trigger_data->list);
+ RCU_INIT_POINTER(trigger_data->filter, NULL);
+
+ trigger_data->private_data = hist_data;
+
+ if (glob[0] == '!') {
+ cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
+ ret = 0;
+ goto out_free;
+ }
+
+ if (!param) /* if param is non-empty, it's supposed to be a filter */
+ goto out_reg;
+
+ if (!cmd_ops->set_filter)
+ goto out_reg;
+
+ ret = cmd_ops->set_filter(param, trigger_data, file);
+ if (ret < 0)
+ goto out_free;
+ out_reg:
+ ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
+ /*
+ * The above returns on success the # of triggers registered,
+ * but if it didn't register any it returns zero. Consider no
+ * triggers registered a failure too.
+ */
+ if (!ret) {
+ ret = -ENOENT;
+ goto out_free;
+ } else if (ret < 0)
+ goto out_free;
+ /* Just return zero, not the number of registered triggers */
+ ret = 0;
+ out:
+ return ret;
+ out_free:
+ if (cmd_ops->set_filter)
+ cmd_ops->set_filter(NULL, trigger_data, NULL);
+
+ kfree(trigger_data);
+
+ destroy_hist_data(hist_data);
+ goto out;
+}
+
+static struct event_command trigger_hist_cmd = {
+ .name = "hist",
+ .trigger_type = ETT_EVENT_HIST,
+ .needs_rec = true,
+ .func = event_hist_trigger_func,
+ .reg = hist_register_trigger,
+ .unreg = unregister_trigger,
+ .get_trigger_ops = event_hist_get_trigger_ops,
+ .set_filter = set_trigger_filter,
+};
+
+__init int register_trigger_hist_cmd(void)
+{
+ int ret;
+
+ ret = register_event_command(&trigger_hist_cmd);
+ WARN_ON(ret < 0);
+
+ return ret;
+}
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 362ae86..1f1db3c 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -1452,6 +1452,7 @@ __init int register_trigger_cmds(void)
register_trigger_snapshot_cmd();
register_trigger_stacktrace_cmd();
register_trigger_enable_disable_cmds();
+ register_trigger_hist_cmd();
return 0;
}
--
1.9.3
Allow users to specify trace event fields to use in aggregated sums
via a new 'vals=' keyword. Before this addition, the only aggregated
sum supported was the implied value 'hitcount'. With this addition,
'hitcount' is also supported as an explicit value field, as is any
numeric trace event field.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx [ if filter] > event/trigger
to this:
# echo hist:keys=xxx:vals=yyy [ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 12 ++++---
kernel/trace/trace_events_hist.c | 75 +++++++++++++++++++++++++++++++++++++++-
2 files changed, 81 insertions(+), 6 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 078db8f..0310500 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3825,14 +3825,16 @@ static const char readme_msg[] =
#ifdef CONFIG_HIST_TRIGGERS
" hist trigger\t- If set, event hits are aggregated into a hash table\n"
"\t Format: hist:keys=<field1>\n"
+ "\t [:values=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
- "\t table using the key named, and the value of a sum called\n"
- "\t 'hitcount' is incremented. Keys correspond to fields in the\n"
- "\t event's format description. Keys can be any field. The\n"
- "\t 'size' parameter can be used to specify more or fewer than\n"
- "\t the default 2048 entries for the hashtable size.\n\n"
+ "\t table using the key(s) and value(s) named, and the value of a\n"
+ "\t sum called 'hitcount' is incremented. Keys and values\n"
+ "\t correspond to fields in the event's format description. Keys\n"
+ "\t can be any field. Values must correspond to numeric fields.\n"
+ "\t The 'size' parameter can be used to specify more or fewer\n"
+ "\t than the default 2048 entries for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
"\t table in its entirety to stdout."
#endif
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 3c86ab2..389ffa0 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -84,6 +84,7 @@ enum hist_field_flags {
struct hist_trigger_attrs {
char *keys_str;
+ char *vals_str;
unsigned int map_bits;
};
@@ -165,6 +166,7 @@ static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
return;
kfree(attrs->keys_str);
+ kfree(attrs->vals_str);
kfree(attrs);
}
@@ -183,6 +185,10 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
if (!strncmp(str, "keys", strlen("keys")) ||
!strncmp(str, "key", strlen("key")))
attrs->keys_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "values", strlen("values")) ||
+ !strncmp(str, "vals", strlen("vals")) ||
+ !strncmp(str, "val", strlen("val")))
+ attrs->vals_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "size", strlen("size"))) {
int map_bits = parse_map_size(str);
@@ -271,13 +277,66 @@ static int create_hitcount_val(struct hist_trigger_data *hist_data)
return 0;
}
+static int create_val_field(struct hist_trigger_data *hist_data,
+ unsigned int val_idx,
+ struct trace_event_file *file,
+ char *field_str)
+{
+ struct ftrace_event_field *field = NULL;
+ unsigned long flags = 0;
+ int ret = 0;
+
+ field = trace_find_event_field(file->event_call, field_str);
+ if (!field) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ hist_data->fields[val_idx] = create_hist_field(field, flags);
+ if (!hist_data->fields[val_idx]) {
+ ret = -ENOMEM;
+ goto out;
+ }
+ hist_data->n_vals++;
+ out:
+ return ret;
+}
+
static int create_val_fields(struct hist_trigger_data *hist_data,
struct trace_event_file *file)
{
+ unsigned int vals_max = TRACING_MAP_FIELDS_MAX - TRACING_MAP_KEYS_MAX;
+ char *fields_str, *field_str;
+ unsigned int i, j;
int ret;
ret = create_hitcount_val(hist_data);
+ if (ret)
+ goto out;
+ fields_str = hist_data->attrs->vals_str;
+ if (!fields_str)
+ goto out;
+
+ strsep(&fields_str, "=");
+ if (!fields_str)
+ goto out;
+
+ vals_max = TRACING_MAP_FIELDS_MAX - TRACING_MAP_KEYS_MAX;
+
+ for (i = 0, j = 1; i < vals_max; i++) {
+ field_str = strsep(&fields_str, ",");
+ if (!field_str)
+ break;
+ if (!strcmp(field_str, "hitcount"))
+ continue;
+ ret = create_val_field(hist_data, j++, file, field_str);
+ if (ret)
+ goto out;
+ }
+ if (fields_str)
+ ret = -EINVAL;
+ out:
return ret;
}
@@ -542,6 +601,12 @@ hist_trigger_entry_print(struct seq_file *m,
seq_printf(m, " hitcount: %10llu",
tracing_map_read_sum(elt, HITCOUNT_IDX));
+ for (i = 1; i < hist_data->n_vals; i++) {
+ seq_printf(m, " %s: %10llu",
+ hist_data->fields[i]->field->name,
+ tracing_map_read_sum(elt, i));
+ }
+
seq_puts(m, "\n");
}
@@ -649,7 +714,15 @@ static int event_hist_trigger_print(struct seq_file *m,
}
seq_puts(m, ":vals=");
- seq_puts(m, "hitcount");
+
+ for_each_hist_val_field(i, hist_data) {
+ if (i == HITCOUNT_IDX)
+ seq_puts(m, "hitcount");
+ else {
+ seq_puts(m, ",");
+ hist_field_print(m, hist_data->fields[i]);
+ }
+ }
seq_puts(m, ":sort=");
seq_puts(m, "hitcount");
--
1.9.3
Allow users to specify multiple trace event fields to use in keys by
allowing multiple fields in the 'keys=' keyword. With this addition,
any unique combination of any of the fields named in the 'keys'
keyword will result in a new entry being added to the hash table.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 10 ++++++----
kernel/trace/trace_events_hist.c | 40 ++++++++++++++++++++++++++++++----------
2 files changed, 36 insertions(+), 14 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 0310500..50ea2f5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3824,7 +3824,7 @@ static const char readme_msg[] =
"\t Filters can be ignored when removing a trigger.\n"
#ifdef CONFIG_HIST_TRIGGERS
" hist trigger\t- If set, event hits are aggregated into a hash table\n"
- "\t Format: hist:keys=<field1>\n"
+ "\t Format: hist:keys=<field1[,field2,...]>\n"
"\t [:values=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
"\t [if <filter>]\n\n"
@@ -3832,9 +3832,11 @@ static const char readme_msg[] =
"\t table using the key(s) and value(s) named, and the value of a\n"
"\t sum called 'hitcount' is incremented. Keys and values\n"
"\t correspond to fields in the event's format description. Keys\n"
- "\t can be any field. Values must correspond to numeric fields.\n"
- "\t The 'size' parameter can be used to specify more or fewer\n"
- "\t than the default 2048 entries for the hashtable size.\n\n"
+ "\t can be any field. Compound keys consisting of up to two\n"
+ "\t fields can be specified by the 'keys' keyword. Values must\n"
+ "\t correspond to numeric fields. The 'size' parameter can be\n"
+ "\t used to specify more or fewer than the default 2048 entries\n"
+ "\t for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
"\t table in its entirety to stdout."
#endif
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 389ffa0..888c67c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -32,6 +32,7 @@ struct hist_field {
unsigned long flags;
hist_field_fn_t fn;
unsigned int size;
+ unsigned int offset;
};
static u64 hist_field_counter(struct hist_field *field, void *event)
@@ -73,8 +74,8 @@ DEFINE_HIST_FIELD_FN(u8);
for (i = hist_data->n_vals; i < hist_data->n_fields; i++)
#define HITCOUNT_IDX 0
-#define HIST_KEY_MAX 1
-#define HIST_KEY_SIZE_MAX MAX_FILTER_STR_VAL
+#define HIST_KEY_MAX 2
+#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + sizeof(u64))
enum hist_field_flags {
HIST_FIELD_HITCOUNT = 1,
@@ -342,6 +343,7 @@ static int create_val_fields(struct hist_trigger_data *hist_data,
static int create_key_field(struct hist_trigger_data *hist_data,
unsigned int key_idx,
+ unsigned int key_offset,
struct trace_event_file *file,
char *field_str)
{
@@ -368,7 +370,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
key_size = ALIGN(key_size, sizeof(u64));
hist_data->fields[key_idx]->size = key_size;
- hist_data->key_size = key_size;
+ hist_data->fields[key_idx]->offset = key_offset;
+ hist_data->key_size += key_size;
if (hist_data->key_size > HIST_KEY_SIZE_MAX) {
ret = -EINVAL;
goto out;
@@ -383,7 +386,7 @@ static int create_key_field(struct hist_trigger_data *hist_data,
static int create_key_fields(struct hist_trigger_data *hist_data,
struct trace_event_file *file)
{
- unsigned int i, n_vals = hist_data->n_vals;
+ unsigned int i, key_offset = 0, n_vals = hist_data->n_vals;
char *fields_str, *field_str;
int ret = -EINVAL;
@@ -399,9 +402,11 @@ static int create_key_fields(struct hist_trigger_data *hist_data,
field_str = strsep(&fields_str, ",");
if (!field_str)
break;
- ret = create_key_field(hist_data, i, file, field_str);
+ ret = create_key_field(hist_data, i, key_offset,
+ file, field_str);
if (ret < 0)
goto out;
+ key_offset += ret;
}
if (fields_str) {
ret = -EINVAL;
@@ -466,7 +471,10 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
else
cmp_fn = tracing_map_cmp_num(field->size,
field->is_signed);
- idx = tracing_map_add_key_field(map, 0, cmp_fn);
+ idx = tracing_map_add_key_field(map,
+ hist_field->offset,
+ cmp_fn);
+
} else
idx = tracing_map_add_sum_field(map);
@@ -548,12 +556,16 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
static void event_hist_trigger(struct event_trigger_data *data, void *rec)
{
struct hist_trigger_data *hist_data = data->private_data;
+ char compound_key[HIST_KEY_SIZE_MAX];
struct hist_field *key_field;
struct tracing_map_elt *elt;
u64 field_contents;
void *key = NULL;
unsigned int i;
+ if (hist_data->n_keys > 1)
+ memset(compound_key, 0, hist_data->key_size);
+
for_each_hist_key_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -562,8 +574,16 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
key = (void *)(unsigned long)field_contents;
else
key = (void *)&field_contents;
+
+ if (hist_data->n_keys > 1) {
+ memcpy(compound_key + key_field->offset, key,
+ key_field->size);
+ }
}
+ if (hist_data->n_keys > 1)
+ key = compound_key;
+
elt = tracing_map_insert(hist_data->map, key);
if (elt)
hist_trigger_elt_update(hist_data, elt, rec);
@@ -588,11 +608,11 @@ hist_trigger_entry_print(struct seq_file *m,
if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
- (char *)key);
+ (char *)(key + key_field->offset));
} else {
- uval = *(u64 *)key;
- seq_printf(m, "%s: %10llu",
- key_field->field->name, uval);
+ uval = *(u64 *)(key + key_field->offset);
+ seq_printf(m, "%s: %10llu", key_field->field->name,
+ uval);
}
}
--
1.9.3
Allow users to specify keys and/or values to sort on. With this
addition, keys and values specified using the 'keys=' and 'vals='
keywords can be used to sort the hist trigger output via a new 'sort='
keyword. If multiple sort keys are specified, the output will be
sorted using the second key as a secondary sort key, etc. The default
sort order is ascending; if the user wants a different sort order,
'.descending' can be appended to the specific sort key. Before this
addition, output was always sorted by 'hitcount' in ascending order.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx:vals=yyy \
[ if filter] > event/trigger
to this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 6 ++-
kernel/trace/trace_events_hist.c | 103 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 106 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 50ea2f5..267655c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3826,6 +3826,7 @@ static const char readme_msg[] =
" hist trigger\t- If set, event hits are aggregated into a hash table\n"
"\t Format: hist:keys=<field1[,field2,...]>\n"
"\t [:values=<field1[,field2,...]>]\n"
+ "\t [:sort=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
@@ -3834,7 +3835,10 @@ static const char readme_msg[] =
"\t correspond to fields in the event's format description. Keys\n"
"\t can be any field. Compound keys consisting of up to two\n"
"\t fields can be specified by the 'keys' keyword. Values must\n"
- "\t correspond to numeric fields. The 'size' parameter can be\n"
+ "\t correspond to numeric fields. Sort keys consisting of up to\n"
+ "\t two fields can be specified using the 'sort' keyword. The\n"
+ "\t sort direction can be modified by appending '.descending' or\n"
+ "\t '.ascending' to a sort field. The 'size' parameter can be\n"
"\t used to specify more or fewer than the default 2048 entries\n"
"\t for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 888c67c..117484b 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -86,6 +86,7 @@ enum hist_field_flags {
struct hist_trigger_attrs {
char *keys_str;
char *vals_str;
+ char *sort_key_str;
unsigned int map_bits;
};
@@ -166,6 +167,7 @@ static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
if (!attrs)
return;
+ kfree(attrs->sort_key_str);
kfree(attrs->keys_str);
kfree(attrs->vals_str);
kfree(attrs);
@@ -190,6 +192,8 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
!strncmp(str, "vals", strlen("vals")) ||
!strncmp(str, "val", strlen("val")))
attrs->vals_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "sort", strlen("sort")))
+ attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "size", strlen("size"))) {
int map_bits = parse_map_size(str);
@@ -435,12 +439,88 @@ static int create_hist_fields(struct hist_trigger_data *hist_data,
return ret;
}
+static int is_descending(const char *str)
+{
+ if (!str)
+ return 0;
+
+ if (!strcmp(str, "descending"))
+ return 1;
+
+ if (!strcmp(str, "ascending"))
+ return 0;
+
+ return -EINVAL;
+}
+
static int create_sort_keys(struct hist_trigger_data *hist_data)
{
+ char *fields_str = hist_data->attrs->sort_key_str;
+ struct ftrace_event_field *field = NULL;
+ struct tracing_map_sort_key *sort_key;
+ unsigned int i, j;
int ret = 0;
- hist_data->n_sort_keys = 1; /* sort_keys[0] is always hitcount */
+ hist_data->n_sort_keys = 1; /* we always have at least one, hitcount */
+
+ if (!fields_str)
+ goto out;
+
+ strsep(&fields_str, "=");
+ if (!fields_str) {
+ ret = -EINVAL;
+ goto out;
+ }
+
+ for (i = 0; i < TRACING_MAP_SORT_KEYS_MAX; i++) {
+ char *field_str, *field_name;
+
+ sort_key = &hist_data->sort_keys[i];
+
+ field_str = strsep(&fields_str, ",");
+ if (!field_str) {
+ if (i == 0)
+ ret = -EINVAL;
+ break;
+ }
+
+ if ((i == TRACING_MAP_SORT_KEYS_MAX - 1) && fields_str) {
+ ret = -EINVAL;
+ break;
+ }
+ field_name = strsep(&field_str, ".");
+ if (!field_name) {
+ ret = -EINVAL;
+ break;
+ }
+
+ if (!strcmp(field_name, "hitcount")) {
+ ret = is_descending(field_str);
+ if (ret < 0)
+ break;
+ sort_key->descending = ret;
+ continue;
+ }
+
+ for (j = 1; j < hist_data->n_fields; j++) {
+ field = hist_data->fields[j]->field;
+ if (field && !strcmp(field_name, field->name)) {
+ sort_key->field_idx = j;
+ ret = is_descending(field_str);
+ if (ret < 0)
+ goto out;
+ sort_key->descending = ret;
+ break;
+ }
+ }
+ if (j == hist_data->n_fields) {
+ ret = -EINVAL;
+ break;
+ }
+ }
+ hist_data->n_sort_keys = i;
+ out:
return ret;
}
@@ -745,7 +825,26 @@ static int event_hist_trigger_print(struct seq_file *m,
}
seq_puts(m, ":sort=");
- seq_puts(m, "hitcount");
+
+ for (i = 0; i < hist_data->n_sort_keys; i++) {
+ struct tracing_map_sort_key *sort_key;
+
+ sort_key = &hist_data->sort_keys[i];
+
+ if (i > 0)
+ seq_puts(m, ",");
+
+ if (sort_key->field_idx == HITCOUNT_IDX)
+ seq_puts(m, "hitcount");
+ else {
+ unsigned int idx = sort_key->field_idx;
+
+ hist_field_print(m, hist_data->fields[idx]);
+ }
+
+ if (sort_key->descending)
+ seq_puts(m, ".descending");
+ }
seq_printf(m, ":size=%u", (1 << hist_data->map->map_bits));
--
1.9.3
Allow users to append 'pause' or 'continue' to an existing trigger in
order to have it paused or to have a paused trace continue.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending \
[ if filter] >> event/trigger
to this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause or cont \
[ if filter] >> event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 7 ++++++-
kernel/trace/trace_events_hist.c | 31 ++++++++++++++++++++++++++++---
2 files changed, 34 insertions(+), 4 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 267655c..b68aedb 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3828,6 +3828,7 @@ static const char readme_msg[] =
"\t [:values=<field1[,field2,...]>]\n"
"\t [:sort=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
+ "\t [:pause][:continue]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
"\t table using the key(s) and value(s) named, and the value of a\n"
@@ -3842,7 +3843,11 @@ static const char readme_msg[] =
"\t used to specify more or fewer than the default 2048 entries\n"
"\t for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
- "\t table in its entirety to stdout."
+ "\t table in its entirety to stdout.\n\n"
+ "\t The 'pause' parameter can be used to pause an existing hist\n"
+ "\t trigger or to start a hist trigger but not log any events\n"
+ "\t until told to do so. 'continue' can be used to start or\n"
+ "\t restart a paused hist trigger.\n\n"
#endif
;
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 117484b..393f32a 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -87,6 +87,8 @@ struct hist_trigger_attrs {
char *keys_str;
char *vals_str;
char *sort_key_str;
+ bool pause;
+ bool cont;
unsigned int map_bits;
};
@@ -194,6 +196,11 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
attrs->vals_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "sort", strlen("sort")))
attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "pause", strlen("pause")))
+ attrs->pause = true;
+ else if (!strncmp(str, "continue", strlen("continue")) ||
+ !strncmp(str, "cont", strlen("cont")))
+ attrs->cont = true;
else if (!strncmp(str, "size", strlen("size"))) {
int map_bits = parse_map_size(str);
@@ -851,7 +858,10 @@ static int event_hist_trigger_print(struct seq_file *m,
if (data->filter_str)
seq_printf(m, " if %s", data->filter_str);
- seq_puts(m, " [active]");
+ if (data->paused)
+ seq_puts(m, " [paused]");
+ else
+ seq_puts(m, " [active]");
seq_putc(m, '\n');
@@ -890,16 +900,30 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file)
{
+ struct hist_trigger_data *hist_data = data->private_data;
struct event_trigger_data *test;
int ret = 0;
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- ret = -EEXIST;
+ if (hist_data->attrs->pause)
+ test->paused = true;
+ else if (hist_data->attrs->cont)
+ test->paused = false;
+ else
+ ret = -EEXIST;
goto out;
}
}
+ if (hist_data->attrs->cont) {
+ ret = -ENOENT;
+ goto out;
+ }
+
+ if (hist_data->attrs->pause)
+ data->paused = true;
+
if (data->ops->init) {
ret = data->ops->init(data->ops, data);
if (ret < 0)
@@ -991,7 +1015,8 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
* triggers registered a failure too.
*/
if (!ret) {
- ret = -ENOENT;
+ if (!(attrs->pause || attrs->cont))
+ ret = -ENOENT;
goto out_free;
} else if (ret < 0)
goto out_free;
--
1.9.3
Allow users to append 'clear' to an existing trigger in order to have
the hash table cleared.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont \
[ if filter] >> event/trigger
to this:
# echo hist:keys=xxx:vals=yyy:sort=zzz.descending:pause/cont/clear \
[ if filter] >> event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 5 ++++-
kernel/trace/trace_events_hist.c | 24 ++++++++++++++++++++++--
2 files changed, 26 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b68aedb..037f6374 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3828,7 +3828,7 @@ static const char readme_msg[] =
"\t [:values=<field1[,field2,...]>]\n"
"\t [:sort=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
- "\t [:pause][:continue]\n"
+ "\t [:pause][:continue][:clear]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
"\t table using the key(s) and value(s) named, and the value of a\n"
@@ -3848,6 +3848,9 @@ static const char readme_msg[] =
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
"\t restart a paused hist trigger.\n\n"
+ "\t The 'clear' parameter will clear the contents of a running\n"
+ "\t hist trigger and leave its current paused/active state\n"
+ "\t unchanged.\n\n"
#endif
;
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 393f32a..dc340f0 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -89,6 +89,7 @@ struct hist_trigger_attrs {
char *sort_key_str;
bool pause;
bool cont;
+ bool clear;
unsigned int map_bits;
};
@@ -198,6 +199,8 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "pause", strlen("pause")))
attrs->pause = true;
+ else if (!strncmp(str, "clear", strlen("clear")))
+ attrs->clear = true;
else if (!strncmp(str, "continue", strlen("continue")) ||
!strncmp(str, "cont", strlen("cont")))
attrs->cont = true;
@@ -896,6 +899,21 @@ static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
return &event_hist_trigger_ops;
}
+static void hist_clear(struct event_trigger_data *data)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+ bool paused;
+
+ paused = data->paused;
+ data->paused = true;
+
+ synchronize_sched();
+
+ tracing_map_clear(hist_data->map);
+
+ data->paused = paused;
+}
+
static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file)
@@ -910,13 +928,15 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
test->paused = true;
else if (hist_data->attrs->cont)
test->paused = false;
+ else if (hist_data->attrs->clear)
+ hist_clear(test);
else
ret = -EEXIST;
goto out;
}
}
- if (hist_data->attrs->cont) {
+ if (hist_data->attrs->cont || hist_data->attrs->clear) {
ret = -ENOENT;
goto out;
}
@@ -1015,7 +1035,7 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
* triggers registered a failure too.
*/
if (!ret) {
- if (!(attrs->pause || attrs->cont))
+ if (!(attrs->pause || attrs->cont || attrs->clear))
ret = -ENOENT;
goto out_free;
} else if (ret < 0)
--
1.9.3
Allow users to have numeric fields displayed as hex values in the
output by appending '.hex' to field names:
# echo hist:keys=aaa,bbb.hex:vals=ccc.hex ... \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 5 +++-
kernel/trace/trace_events_hist.c | 61 ++++++++++++++++++++++++++++++++++++----
2 files changed, 59 insertions(+), 7 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 037f6374..15eda83 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3843,7 +3843,10 @@ static const char readme_msg[] =
"\t used to specify more or fewer than the default 2048 entries\n"
"\t for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
- "\t table in its entirety to stdout.\n\n"
+ "\t table in its entirety to stdout. The default format used to\n"
+ "\t display a given field can be modified by appending any of the\n"
+ "\t following modifiers to the field name, as applicable:\n\n"
+ "\t .hex display a number as a hex value\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index dc340f0..1977d934 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -81,6 +81,7 @@ enum hist_field_flags {
HIST_FIELD_HITCOUNT = 1,
HIST_FIELD_KEY = 2,
HIST_FIELD_STRING = 4,
+ HIST_FIELD_HEX = 8,
};
struct hist_trigger_attrs {
@@ -299,9 +300,20 @@ static int create_val_field(struct hist_trigger_data *hist_data,
{
struct ftrace_event_field *field = NULL;
unsigned long flags = 0;
+ char *field_name;
int ret = 0;
- field = trace_find_event_field(file->event_call, field_str);
+ field_name = strsep(&field_str, ".");
+ if (field_str) {
+ if (!strcmp(field_str, "hex"))
+ flags |= HIST_FIELD_HEX;
+ else {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ field = trace_find_event_field(file->event_call, field_name);
if (!field) {
ret = -EINVAL;
goto out;
@@ -364,11 +376,22 @@ static int create_key_field(struct hist_trigger_data *hist_data,
struct ftrace_event_field *field = NULL;
unsigned long flags = 0;
unsigned int key_size;
+ char *field_name;
int ret = 0;
flags |= HIST_FIELD_KEY;
- field = trace_find_event_field(file->event_call, field_str);
+ field_name = strsep(&field_str, ".");
+ if (field_str) {
+ if (!strcmp(field_str, "hex"))
+ flags |= HIST_FIELD_HEX;
+ else {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ field = trace_find_event_field(file->event_call, field_name);
if (!field) {
ret = -EINVAL;
goto out;
@@ -696,7 +719,11 @@ hist_trigger_entry_print(struct seq_file *m,
if (i > hist_data->n_vals)
seq_puts(m, ", ");
- if (key_field->flags & HIST_FIELD_STRING) {
+ if (key_field->flags & HIST_FIELD_HEX) {
+ uval = *(u64 *)(key + key_field->offset);
+ seq_printf(m, "%s: %llx",
+ key_field->field->name, uval);
+ } else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
} else {
@@ -712,9 +739,15 @@ hist_trigger_entry_print(struct seq_file *m,
tracing_map_read_sum(elt, HITCOUNT_IDX));
for (i = 1; i < hist_data->n_vals; i++) {
- seq_printf(m, " %s: %10llu",
- hist_data->fields[i]->field->name,
- tracing_map_read_sum(elt, i));
+ if (hist_data->fields[i]->flags & HIST_FIELD_HEX) {
+ seq_printf(m, " %s: %10llx",
+ hist_data->fields[i]->field->name,
+ tracing_map_read_sum(elt, i));
+ } else {
+ seq_printf(m, " %s: %10llu",
+ hist_data->fields[i]->field->name,
+ tracing_map_read_sum(elt, i));
+ }
}
seq_puts(m, "\n");
@@ -799,9 +832,25 @@ const struct file_operations event_hist_fops = {
.release = single_release,
};
+static const char *get_hist_field_flags(struct hist_field *hist_field)
+{
+ const char *flags_str = NULL;
+
+ if (hist_field->flags & HIST_FIELD_HEX)
+ flags_str = "hex";
+
+ return flags_str;
+}
+
static void hist_field_print(struct seq_file *m, struct hist_field *hist_field)
{
seq_printf(m, "%s", hist_field->field->name);
+ if (hist_field->flags) {
+ const char *flags_str = get_hist_field_flags(hist_field);
+
+ if (flags_str)
+ seq_printf(m, ".%s", flags_str);
+ }
}
static int event_hist_trigger_print(struct seq_file *m,
--
1.9.3
Allow users to have address fields displayed as symbols in the output
by appending '.sym' or 'sym-offset' to field names:
# echo hist:keys=aaa.sym,bbb.sym-offset ... \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 4 +++-
kernel/trace/trace_events_hist.c | 21 +++++++++++++++++++++
2 files changed, 24 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 15eda83..b1525b8 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3846,7 +3846,9 @@ static const char readme_msg[] =
"\t table in its entirety to stdout. The default format used to\n"
"\t display a given field can be modified by appending any of the\n"
"\t following modifiers to the field name, as applicable:\n\n"
- "\t .hex display a number as a hex value\n\n"
+ "\t .hex display a number as a hex value\n"
+ "\t .sym display an address as a symbol\n"
+ "\t .sym-offset display an address as a symbol and offset\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 1977d934..aaec8de 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -82,6 +82,8 @@ enum hist_field_flags {
HIST_FIELD_KEY = 2,
HIST_FIELD_STRING = 4,
HIST_FIELD_HEX = 8,
+ HIST_FIELD_SYM = 16,
+ HIST_FIELD_SYM_OFFSET = 32,
};
struct hist_trigger_attrs {
@@ -385,6 +387,10 @@ static int create_key_field(struct hist_trigger_data *hist_data,
if (field_str) {
if (!strcmp(field_str, "hex"))
flags |= HIST_FIELD_HEX;
+ else if (!strcmp(field_str, "sym"))
+ flags |= HIST_FIELD_SYM;
+ else if (!strcmp(field_str, "sym-offset"))
+ flags |= HIST_FIELD_SYM_OFFSET;
else {
ret = -EINVAL;
goto out;
@@ -708,6 +714,7 @@ hist_trigger_entry_print(struct seq_file *m,
struct tracing_map_elt *elt)
{
struct hist_field *key_field;
+ char str[KSYM_SYMBOL_LEN];
unsigned int i;
u64 uval;
@@ -723,6 +730,16 @@ hist_trigger_entry_print(struct seq_file *m,
uval = *(u64 *)(key + key_field->offset);
seq_printf(m, "%s: %llx",
key_field->field->name, uval);
+ } else if (key_field->flags & HIST_FIELD_SYM) {
+ uval = *(u64 *)(key + key_field->offset);
+ sprint_symbol_no_offset(str, uval);
+ seq_printf(m, "%s: [%llx] %-45s",
+ key_field->field->name, uval, str);
+ } else if (key_field->flags & HIST_FIELD_SYM_OFFSET) {
+ uval = *(u64 *)(key + key_field->offset);
+ sprint_symbol(str, uval);
+ seq_printf(m, "%s: [%llx] %-55s",
+ key_field->field->name, uval, str);
} else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -838,6 +855,10 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
if (hist_field->flags & HIST_FIELD_HEX)
flags_str = "hex";
+ else if (hist_field->flags & HIST_FIELD_SYM)
+ flags_str = "sym";
+ else if (hist_field->flags & HIST_FIELD_SYM_OFFSET)
+ flags_str = "sym-offset";
return flags_str;
}
--
1.9.3
Allow users to have common_pid field values displayed as program names
in the output by appending '.execname' to a common_pid field name:
# echo hist:keys=common_pid.execname ... \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 3 +-
kernel/trace/trace_events_hist.c | 100 ++++++++++++++++++++++++++++++++++++++-
2 files changed, 101 insertions(+), 2 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index b1525b8..3c2beab 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3848,7 +3848,8 @@ static const char readme_msg[] =
"\t following modifiers to the field name, as applicable:\n\n"
"\t .hex display a number as a hex value\n"
"\t .sym display an address as a symbol\n"
- "\t .sym-offset display an address as a symbol and offset\n\n"
+ "\t .sym-offset display an address as a symbol and offset\n"
+ "\t .execname display a common_pid as a program name\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index aaec8de..4a8e97c 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -84,6 +84,7 @@ enum hist_field_flags {
HIST_FIELD_HEX = 8,
HIST_FIELD_SYM = 16,
HIST_FIELD_SYM_OFFSET = 32,
+ HIST_FIELD_EXECNAME = 64,
};
struct hist_trigger_attrs {
@@ -233,6 +234,73 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
return ERR_PTR(ret);
}
+static inline void save_comm(char *comm, struct task_struct *task)
+{
+ if (!task->pid) {
+ strcpy(comm, "<idle>");
+ return;
+ }
+
+ if (WARN_ON_ONCE(task->pid < 0)) {
+ strcpy(comm, "<XXX>");
+ return;
+ }
+
+ memcpy(comm, task->comm, TASK_COMM_LEN);
+}
+
+static void hist_trigger_elt_free(struct tracing_map_elt *elt)
+{
+ kfree((char *)elt->private_data);
+}
+
+static int hist_trigger_elt_alloc(struct tracing_map_elt *elt)
+{
+ struct hist_trigger_data *hist_data = elt->map->private_data;
+ struct hist_field *key_field;
+ unsigned int i;
+
+ for_each_hist_key_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+
+ if (key_field->flags & HIST_FIELD_EXECNAME) {
+ unsigned int size = TASK_COMM_LEN + 1;
+
+ elt->private_data = kzalloc(size, GFP_KERNEL);
+ if (!elt->private_data)
+ return -ENOMEM;
+ break;
+ }
+ }
+
+ return 0;
+}
+
+static void hist_trigger_elt_copy(struct tracing_map_elt *to,
+ struct tracing_map_elt *from)
+{
+ char *comm_from = from->private_data;
+ char *comm_to = to->private_data;
+
+ if (comm_from)
+ memcpy(comm_to, comm_from, TASK_COMM_LEN + 1);
+}
+
+static void hist_trigger_elt_init(struct tracing_map_elt *elt)
+{
+ char *comm = elt->private_data;
+
+ if (comm)
+ save_comm(comm, current);
+}
+
+static const struct tracing_map_ops hist_trigger_ops = {
+ .elt_alloc = hist_trigger_elt_alloc,
+ .elt_copy = hist_trigger_elt_copy,
+ .elt_free = hist_trigger_elt_free,
+ .elt_init = hist_trigger_elt_init,
+};
+
static void destroy_hist_field(struct hist_field *hist_field)
{
kfree(hist_field);
@@ -391,6 +459,9 @@ static int create_key_field(struct hist_trigger_data *hist_data,
flags |= HIST_FIELD_SYM;
else if (!strcmp(field_str, "sym-offset"))
flags |= HIST_FIELD_SYM_OFFSET;
+ else if (!strcmp(field_str, "execname") &&
+ !strcmp(field_name, "common_pid"))
+ flags |= HIST_FIELD_EXECNAME;
else {
ret = -EINVAL;
goto out;
@@ -604,11 +675,27 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
return 0;
}
+static bool need_trigger_ops(struct hist_trigger_data *hist_data)
+{
+ struct hist_field *key_field;
+ unsigned int i;
+
+ for_each_hist_key_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+
+ if (key_field->flags & HIST_FIELD_EXECNAME)
+ return true;
+ }
+
+ return false;
+}
+
static struct hist_trigger_data *
create_hist_data(unsigned int map_bits,
struct hist_trigger_attrs *attrs,
struct trace_event_file *file)
{
+ const struct tracing_map_ops *trigger_ops = NULL;
struct hist_trigger_data *hist_data;
int ret = 0;
@@ -626,8 +713,11 @@ create_hist_data(unsigned int map_bits,
if (ret < 0)
goto free;
+ if (need_trigger_ops(hist_data))
+ trigger_ops = &hist_trigger_ops;
+
hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
- NULL, hist_data);
+ trigger_ops, hist_data);
if (IS_ERR(hist_data->map)) {
ret = PTR_ERR(hist_data->map);
hist_data->map = NULL;
@@ -740,6 +830,12 @@ hist_trigger_entry_print(struct seq_file *m,
sprint_symbol(str, uval);
seq_printf(m, "%s: [%llx] %-55s",
key_field->field->name, uval, str);
+ } else if (key_field->flags & HIST_FIELD_EXECNAME) {
+ char *comm = elt->private_data;
+
+ uval = *(u64 *)(key + key_field->offset);
+ seq_printf(m, "%s: %-16s[%10llu]",
+ key_field->field->name, comm, uval);
} else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -859,6 +955,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
flags_str = "sym";
else if (hist_field->flags & HIST_FIELD_SYM_OFFSET)
flags_str = "sym-offset";
+ else if (hist_field->flags & HIST_FIELD_EXECNAME)
+ flags_str = "execname";
return flags_str;
}
--
1.9.3
Allow users to have syscall id fields displayed as syscall names in
the output by appending '.syscall' to field names:
# echo hist:keys=aaa.syscall ... \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 3 ++-
kernel/trace/trace_events_hist.c | 15 +++++++++++++++
2 files changed, 17 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3c2beab..c42f741 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3849,7 +3849,8 @@ static const char readme_msg[] =
"\t .hex display a number as a hex value\n"
"\t .sym display an address as a symbol\n"
"\t .sym-offset display an address as a symbol and offset\n"
- "\t .execname display a common_pid as a program name\n\n"
+ "\t .execname display a common_pid as a program name\n"
+ "\t .syscall display a syscall id as a syscall name\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 4a8e97c..5e4f704 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -85,6 +85,7 @@ enum hist_field_flags {
HIST_FIELD_SYM = 16,
HIST_FIELD_SYM_OFFSET = 32,
HIST_FIELD_EXECNAME = 64,
+ HIST_FIELD_SYSCALL = 128,
};
struct hist_trigger_attrs {
@@ -462,6 +463,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
else if (!strcmp(field_str, "execname") &&
!strcmp(field_name, "common_pid"))
flags |= HIST_FIELD_EXECNAME;
+ else if (!strcmp(field_str, "syscall"))
+ flags |= HIST_FIELD_SYSCALL;
else {
ret = -EINVAL;
goto out;
@@ -836,6 +839,16 @@ hist_trigger_entry_print(struct seq_file *m,
uval = *(u64 *)(key + key_field->offset);
seq_printf(m, "%s: %-16s[%10llu]",
key_field->field->name, comm, uval);
+ } else if (key_field->flags & HIST_FIELD_SYSCALL) {
+ const char *syscall_name;
+
+ uval = *(u64 *)(key + key_field->offset);
+ syscall_name = get_syscall_name(uval);
+ if (!syscall_name)
+ syscall_name = "unknown_syscall";
+
+ seq_printf(m, "%s: %-30s[%3llu]",
+ key_field->field->name, syscall_name, uval);
} else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -957,6 +970,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
flags_str = "sym-offset";
else if (hist_field->flags & HIST_FIELD_EXECNAME)
flags_str = "execname";
+ else if (hist_field->flags & HIST_FIELD_SYSCALL)
+ flags_str = "syscall";
return flags_str;
}
--
1.9.3
It's often useful to be able to use a stacktrace as a hash key, for
keeping a count of the number of times a particular call path resulted
in a trace event, for instance. Add a special key named 'stacktrace'
which can be used as key in a 'keys=' param for this purpose:
# echo hist:keys=stacktrace ... \
[ if filter] > event/trigger
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.c | 16 ++---
kernel/trace/trace_events_hist.c | 135 +++++++++++++++++++++++++++++----------
2 files changed, 109 insertions(+), 42 deletions(-)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c42f741..1ddeee5 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3834,14 +3834,14 @@ static const char readme_msg[] =
"\t table using the key(s) and value(s) named, and the value of a\n"
"\t sum called 'hitcount' is incremented. Keys and values\n"
"\t correspond to fields in the event's format description. Keys\n"
- "\t can be any field. Compound keys consisting of up to two\n"
- "\t fields can be specified by the 'keys' keyword. Values must\n"
- "\t correspond to numeric fields. Sort keys consisting of up to\n"
- "\t two fields can be specified using the 'sort' keyword. The\n"
- "\t sort direction can be modified by appending '.descending' or\n"
- "\t '.ascending' to a sort field. The 'size' parameter can be\n"
- "\t used to specify more or fewer than the default 2048 entries\n"
- "\t for the hashtable size.\n\n"
+ "\t can be any field, or the special string 'stacktrace'.\n"
+ "\t Compound keys consisting of up to two fields can be specified\n"
+ "\t by the 'keys' keyword. Values must correspond to numeric\n"
+ "\t fields. Sort keys consisting of up to two fields can be\n"
+ "\t specified using the 'sort' keyword. The sort direction can\n"
+ "\t be modified by appending '.descending' or '.ascending' to a\n"
+ "\t sort field. The 'size' parameter can be used to specify more\n"
+ "\t or fewer than the default 2048 entries for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
"\t table in its entirety to stdout. The default format used to\n"
"\t display a given field can be modified by appending any of the\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 5e4f704..55dc220 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -35,6 +35,11 @@ struct hist_field {
unsigned int offset;
};
+static u64 hist_field_none(struct hist_field *field, void *event)
+{
+ return 0;
+}
+
static u64 hist_field_counter(struct hist_field *field, void *event)
{
return 1;
@@ -73,9 +78,13 @@ DEFINE_HIST_FIELD_FN(u8);
#define for_each_hist_key_field(i, hist_data) \
for (i = hist_data->n_vals; i < hist_data->n_fields; i++)
+#define HIST_STACKTRACE_DEPTH 16
+#define HIST_STACKTRACE_SIZE (HIST_STACKTRACE_DEPTH * sizeof(unsigned long))
+#define HIST_STACKTRACE_SKIP 5
+
#define HITCOUNT_IDX 0
#define HIST_KEY_MAX 2
-#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + sizeof(u64))
+#define HIST_KEY_SIZE_MAX (MAX_FILTER_STR_VAL + HIST_STACKTRACE_SIZE)
enum hist_field_flags {
HIST_FIELD_HITCOUNT = 1,
@@ -86,6 +95,7 @@ enum hist_field_flags {
HIST_FIELD_SYM_OFFSET = 32,
HIST_FIELD_EXECNAME = 64,
HIST_FIELD_SYSCALL = 128,
+ HIST_FIELD_STACKTRACE = 256,
};
struct hist_trigger_attrs {
@@ -324,6 +334,11 @@ static struct hist_field *create_hist_field(struct ftrace_event_field *field,
goto out;
}
+ if (flags & HIST_FIELD_STACKTRACE) {
+ hist_field->fn = hist_field_none;
+ goto out;
+ }
+
if (is_string_field(field)) {
flags |= HIST_FIELD_STRING;
hist_field->fn = hist_field_string;
@@ -447,38 +462,43 @@ static int create_key_field(struct hist_trigger_data *hist_data,
struct ftrace_event_field *field = NULL;
unsigned long flags = 0;
unsigned int key_size;
- char *field_name;
int ret = 0;
flags |= HIST_FIELD_KEY;
- field_name = strsep(&field_str, ".");
- if (field_str) {
- if (!strcmp(field_str, "hex"))
- flags |= HIST_FIELD_HEX;
- else if (!strcmp(field_str, "sym"))
- flags |= HIST_FIELD_SYM;
- else if (!strcmp(field_str, "sym-offset"))
- flags |= HIST_FIELD_SYM_OFFSET;
- else if (!strcmp(field_str, "execname") &&
- !strcmp(field_name, "common_pid"))
- flags |= HIST_FIELD_EXECNAME;
- else if (!strcmp(field_str, "syscall"))
- flags |= HIST_FIELD_SYSCALL;
- else {
+ if (!strcmp(field_str, "stacktrace")) {
+ flags |= HIST_FIELD_STACKTRACE;
+ key_size = sizeof(unsigned long) * HIST_STACKTRACE_DEPTH;
+ } else {
+ char *field_name = strsep(&field_str, ".");
+
+ if (field_str) {
+ if (!strcmp(field_str, "hex"))
+ flags |= HIST_FIELD_HEX;
+ else if (!strcmp(field_str, "sym"))
+ flags |= HIST_FIELD_SYM;
+ else if (!strcmp(field_str, "sym-offset"))
+ flags |= HIST_FIELD_SYM_OFFSET;
+ else if (!strcmp(field_str, "execname") &&
+ !strcmp(field_name, "common_pid"))
+ flags |= HIST_FIELD_EXECNAME;
+ else if (!strcmp(field_str, "syscall"))
+ flags |= HIST_FIELD_SYSCALL;
+ else {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+
+ field = trace_find_event_field(file->event_call, field_name);
+ if (!field) {
ret = -EINVAL;
goto out;
}
- }
- field = trace_find_event_field(file->event_call, field_name);
- if (!field) {
- ret = -EINVAL;
- goto out;
+ key_size = field->size;
}
- key_size = field->size;
-
hist_data->fields[key_idx] = create_hist_field(field, flags);
if (!hist_data->fields[key_idx]) {
ret = -ENOMEM;
@@ -659,7 +679,9 @@ static int create_tracing_map_fields(struct hist_trigger_data *hist_data)
field = hist_field->field;
- if (is_string_field(field))
+ if (hist_field->flags & HIST_FIELD_STACKTRACE)
+ cmp_fn = tracing_map_cmp_none;
+ else if (is_string_field(field))
cmp_fn = tracing_map_cmp_string;
else
cmp_fn = tracing_map_cmp_num(field->size,
@@ -768,7 +790,9 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
static void event_hist_trigger(struct event_trigger_data *data, void *rec)
{
struct hist_trigger_data *hist_data = data->private_data;
+ unsigned long entries[HIST_STACKTRACE_DEPTH];
char compound_key[HIST_KEY_SIZE_MAX];
+ struct stack_trace stacktrace;
struct hist_field *key_field;
struct tracing_map_elt *elt;
u64 field_contents;
@@ -781,15 +805,27 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
for_each_hist_key_field(i, hist_data) {
key_field = hist_data->fields[i];
- field_contents = key_field->fn(key_field, rec);
- if (key_field->flags & HIST_FIELD_STRING)
- key = (void *)(unsigned long)field_contents;
- else
- key = (void *)&field_contents;
+ if (key_field->flags & HIST_FIELD_STACKTRACE) {
+ stacktrace.max_entries = HIST_STACKTRACE_DEPTH;
+ stacktrace.entries = entries;
+ stacktrace.nr_entries = 0;
+ stacktrace.skip = HIST_STACKTRACE_SKIP;
- if (hist_data->n_keys > 1) {
- memcpy(compound_key + key_field->offset, key,
- key_field->size);
+ memset(stacktrace.entries, 0, HIST_STACKTRACE_SIZE);
+ save_stack_trace(&stacktrace);
+
+ key = entries;
+ } else {
+ field_contents = key_field->fn(key_field, rec);
+ if (key_field->flags & HIST_FIELD_STRING)
+ key = (void *)(unsigned long)field_contents;
+ else
+ key = (void *)&field_contents;
+
+ if (hist_data->n_keys > 1) {
+ memcpy(compound_key + key_field->offset, key,
+ key_field->size);
+ }
}
}
@@ -801,6 +837,24 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
hist_trigger_elt_update(hist_data, elt, rec);
}
+static void hist_trigger_stacktrace_print(struct seq_file *m,
+ unsigned long *stacktrace_entries,
+ unsigned int max_entries)
+{
+ char str[KSYM_SYMBOL_LEN];
+ unsigned int spaces = 8;
+ unsigned int i;
+
+ for (i = 0; i < max_entries; i++) {
+ if (stacktrace_entries[i] == ULONG_MAX)
+ return;
+
+ seq_printf(m, "%*c", 1 + spaces, ' ');
+ sprint_symbol(str, stacktrace_entries[i]);
+ seq_printf(m, "%s\n", str);
+ }
+}
+
static void
hist_trigger_entry_print(struct seq_file *m,
struct hist_trigger_data *hist_data, void *key,
@@ -808,6 +862,7 @@ hist_trigger_entry_print(struct seq_file *m,
{
struct hist_field *key_field;
char str[KSYM_SYMBOL_LEN];
+ bool multiline = false;
unsigned int i;
u64 uval;
@@ -849,6 +904,12 @@ hist_trigger_entry_print(struct seq_file *m,
seq_printf(m, "%s: %-30s[%3llu]",
key_field->field->name, syscall_name, uval);
+ } else if (key_field->flags & HIST_FIELD_STACKTRACE) {
+ seq_puts(m, "stacktrace:\n");
+ hist_trigger_stacktrace_print(m,
+ key + key_field->offset,
+ HIST_STACKTRACE_DEPTH);
+ multiline = true;
} else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -859,7 +920,10 @@ hist_trigger_entry_print(struct seq_file *m,
}
}
- seq_puts(m, " }");
+ if (!multiline)
+ seq_puts(m, " ");
+
+ seq_puts(m, "}");
seq_printf(m, " hitcount: %10llu",
tracing_map_read_sum(elt, HITCOUNT_IDX));
@@ -1003,7 +1067,10 @@ static int event_hist_trigger_print(struct seq_file *m,
if (i > hist_data->n_vals)
seq_puts(m, ",");
- hist_field_print(m, key_field);
+ if (key_field->flags & HIST_FIELD_STACKTRACE)
+ seq_puts(m, "stacktrace");
+ else
+ hist_field_print(m, key_field);
}
seq_puts(m, ":vals=");
--
1.9.3
From: Namhyung Kim <[email protected]>
The string in a trace event is usually recorded as dynamic array which
is variable length. But current hist code only support fixed length
array so it cannot support most strings.
This patch fixes it by checking filter_type of the field and get
proper pointer with it. With this, it can get a histogram of exec()
based on filenames like below:
# cd /sys/kernel/tracing/events/sched/sched_process_exec
# cat 'hist:key=filename' > trigger
# ps
PID TTY TIME CMD
1 ? 00:00:00 init
29 ? 00:00:00 sh
38 ? 00:00:00 ps
# ls
enable filter format hist id trigger
# cat hist
# trigger info: hist:keys=filename:vals=hitcount:sort=hitcount:size=2048 [active]
{ filename: /usr/bin/ps } hitcount: 1
{ filename: /usr/bin/ls } hitcount: 1
{ filename: /usr/bin/cat } hitcount: 1
Totals:
Hits: 3
Entries: 3
Dropped: 0
Cc: Tom Zanussi <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace_events_hist.c | 47 +++++++++++++++++++++++++++++++++++++---
1 file changed, 44 insertions(+), 3 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 55dc220..fe2f891 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -52,6 +52,22 @@ static u64 hist_field_string(struct hist_field *hist_field, void *event)
return (u64)(unsigned long)addr;
}
+static u64 hist_field_dynstring(struct hist_field *hist_field, void *event)
+{
+ u32 str_item = *(u32 *)(event + hist_field->field->offset);
+ int str_loc = str_item & 0xffff;
+ char *addr = (char *)(event + str_loc);
+
+ return (u64)addr;
+}
+
+static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
+{
+ char **addr = (char **)(event + hist_field->field->offset);
+
+ return (u64)*addr;
+}
+
#define DEFINE_HIST_FIELD_FN(type) \
static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
{ \
@@ -341,7 +357,13 @@ static struct hist_field *create_hist_field(struct ftrace_event_field *field,
if (is_string_field(field)) {
flags |= HIST_FIELD_STRING;
- hist_field->fn = hist_field_string;
+
+ if (field->filter_type == FILTER_STATIC_STRING)
+ hist_field->fn = hist_field_string;
+ else if (field->filter_type == FILTER_DYN_STRING)
+ hist_field->fn = hist_field_dynstring;
+ else
+ hist_field->fn = hist_field_pstring;
} else {
hist_field->fn = select_value_fn(field->size,
field->is_signed);
@@ -496,7 +518,10 @@ static int create_key_field(struct hist_trigger_data *hist_data,
goto out;
}
- key_size = field->size;
+ if (is_string_field(field)) /* should be last key field */
+ key_size = HIST_KEY_SIZE_MAX - key_offset;
+ else
+ key_size = field->size;
}
hist_data->fields[key_idx] = create_hist_field(field, flags);
@@ -823,8 +848,24 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
key = (void *)&field_contents;
if (hist_data->n_keys > 1) {
+ /* ensure NULL-termination */
+ size_t size = key_field->size - 1;
+
+ if (key_field->flags & HIST_FIELD_STRING) {
+ struct ftrace_event_field *field;
+
+ field = key_field->field;
+ if (field->filter_type == FILTER_DYN_STRING)
+ size = *(u32 *)(rec + field->offset) >> 16;
+ else if (field->filter_type == FILTER_PTR_STRING)
+ size = strlen(key);
+
+ if (size > key_field->size - 1)
+ size = key_field->size - 1;
+ }
+
memcpy(compound_key + key_field->offset, key,
- key_field->size);
+ size);
}
}
}
--
1.9.3
If we assume the maximum size for a string field, we don't have to
worry about its position. Since we only allow two keys in a compound
key and having more than one string key in a given compound key
doesn't make much sense anyway, trading a bit of extra space instead
of introducing an arbitrary restriction makes more sense.
We also need to use the event field size for static strings when
copying the contents, otherwise we get random garbage in the key.
Also, cast string return values to avoid warnings on 32-bit compiles.
Finally, rearrange the code without changing any functionality by
moving the compound key updating code into a separate function.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace_events_hist.c | 67 ++++++++++++++++++++++------------------
1 file changed, 37 insertions(+), 30 deletions(-)
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index fe2f891..90a7c93 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -58,14 +58,14 @@ static u64 hist_field_dynstring(struct hist_field *hist_field, void *event)
int str_loc = str_item & 0xffff;
char *addr = (char *)(event + str_loc);
- return (u64)addr;
+ return (u64)(unsigned long)addr;
}
static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
{
char **addr = (char **)(event + hist_field->field->offset);
- return (u64)*addr;
+ return (u64)(unsigned long)*addr;
}
#define DEFINE_HIST_FIELD_FN(type) \
@@ -518,8 +518,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
goto out;
}
- if (is_string_field(field)) /* should be last key field */
- key_size = HIST_KEY_SIZE_MAX - key_offset;
+ if (is_string_field(field))
+ key_size = MAX_FILTER_STR_VAL;
else
key_size = field->size;
}
@@ -812,9 +812,34 @@ static void hist_trigger_elt_update(struct hist_trigger_data *hist_data,
}
}
+static inline void add_to_key(char *compound_key, void *key,
+ struct hist_field *key_field, void *rec)
+{
+ size_t size = key_field->size;
+
+ if (key_field->flags & HIST_FIELD_STRING) {
+ struct ftrace_event_field *field;
+
+ field = key_field->field;
+ if (field->filter_type == FILTER_DYN_STRING)
+ size = *(u32 *)(rec + field->offset) >> 16;
+ else if (field->filter_type == FILTER_PTR_STRING)
+ size = strlen(key);
+ else if (field->filter_type == FILTER_STATIC_STRING)
+ size = field->size;
+
+ /* ensure NULL-termination */
+ if (size > key_field->size - 1)
+ size = key_field->size - 1;
+ }
+
+ memcpy(compound_key + key_field->offset, key, size);
+}
+
static void event_hist_trigger(struct event_trigger_data *data, void *rec)
{
struct hist_trigger_data *hist_data = data->private_data;
+ bool use_compound_key = (hist_data->n_keys > 1);
unsigned long entries[HIST_STACKTRACE_DEPTH];
char compound_key[HIST_KEY_SIZE_MAX];
struct stack_trace stacktrace;
@@ -824,8 +849,7 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
void *key = NULL;
unsigned int i;
- if (hist_data->n_keys > 1)
- memset(compound_key, 0, hist_data->key_size);
+ memset(compound_key, 0, hist_data->key_size);
for_each_hist_key_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -842,35 +866,18 @@ static void event_hist_trigger(struct event_trigger_data *data, void *rec)
key = entries;
} else {
field_contents = key_field->fn(key_field, rec);
- if (key_field->flags & HIST_FIELD_STRING)
+ if (key_field->flags & HIST_FIELD_STRING) {
key = (void *)(unsigned long)field_contents;
- else
+ use_compound_key = true;
+ } else
key = (void *)&field_contents;
-
- if (hist_data->n_keys > 1) {
- /* ensure NULL-termination */
- size_t size = key_field->size - 1;
-
- if (key_field->flags & HIST_FIELD_STRING) {
- struct ftrace_event_field *field;
-
- field = key_field->field;
- if (field->filter_type == FILTER_DYN_STRING)
- size = *(u32 *)(rec + field->offset) >> 16;
- else if (field->filter_type == FILTER_PTR_STRING)
- size = strlen(key);
-
- if (size > key_field->size - 1)
- size = key_field->size - 1;
- }
-
- memcpy(compound_key + key_field->offset, key,
- size);
- }
}
+
+ if (use_compound_key)
+ add_to_key(compound_key, key, key_field, rec);
}
- if (hist_data->n_keys > 1)
+ if (use_compound_key)
key = compound_key;
elt = tracing_map_insert(hist_data->map, key);
--
1.9.3
Similar to enable_event/disable_event triggers, these triggers enable
and disable the aggregation of events into maps rather than enabling
and disabling their writing into the trace buffer.
They can be used to automatically start and stop hist triggers based
on a matching filter condition.
If there's a paused hist trigger on system:event, the following would
start it when the filter condition was hit:
# echo enable_hist:system:event [ if filter] > event/trigger
And the following would disable a running system:event hist trigger:
# echo disable_hist:system:event [ if filter] > event/trigger
See Documentation/trace/events.txt for real examples.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
include/linux/trace_events.h | 1 +
kernel/trace/trace.c | 8 +++
kernel/trace/trace.h | 32 ++++++++++
kernel/trace/trace_events_hist.c | 115 ++++++++++++++++++++++++++++++++++++
kernel/trace/trace_events_trigger.c | 71 ++++++++++++----------
5 files changed, 196 insertions(+), 31 deletions(-)
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h
index e61816d..70f8fc4 100644
--- a/include/linux/trace_events.h
+++ b/include/linux/trace_events.h
@@ -418,6 +418,7 @@ enum event_trigger_type {
ETT_STACKTRACE = (1 << 2),
ETT_EVENT_ENABLE = (1 << 3),
ETT_EVENT_HIST = (1 << 4),
+ ETT_HIST_ENABLE = (1 << 5),
};
extern int filter_match_preds(struct event_filter *filter, void *rec);
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 1ddeee5..8b9424d 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3798,6 +3798,10 @@ static const char readme_msg[] =
"\t trigger: traceon, traceoff\n"
"\t enable_event:<system>:<event>\n"
"\t disable_event:<system>:<event>\n"
+#ifdef CONFIG_HIST_TRIGGERS
+ "\t enable_hist:<system>:<event>\n"
+ "\t disable_hist:<system>:<event>\n"
+#endif
#ifdef CONFIG_STACKTRACE
"\t\t stacktrace\n"
#endif
@@ -3858,6 +3862,10 @@ static const char readme_msg[] =
"\t The 'clear' parameter will clear the contents of a running\n"
"\t hist trigger and leave its current paused/active state\n"
"\t unchanged.\n\n"
+ "\t The enable_hist and disable_hist triggers can be used to\n"
+ "\t have one event conditionally start and stop another event's\n"
+ "\t already-attached hist trigger. The syntax is analagous to\n"
+ "\t the enable_event and disable_event triggers.\n"
#endif
;
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index a2a6793..7126dd7 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1165,8 +1165,10 @@ extern const struct file_operations event_hist_fops;
#ifdef CONFIG_HIST_TRIGGERS
extern int register_trigger_hist_cmd(void);
+extern int register_trigger_hist_enable_disable_cmds(void);
#else
static inline int register_trigger_hist_cmd(void) { return 0; }
+static inline int register_trigger_hist_enable_disable_cmds(void) { return 0; }
#endif
extern int register_trigger_cmds(void);
@@ -1184,6 +1186,34 @@ struct event_trigger_data {
struct list_head list;
};
+/* Avoid typos */
+#define ENABLE_EVENT_STR "enable_event"
+#define DISABLE_EVENT_STR "disable_event"
+#define ENABLE_HIST_STR "enable_hist"
+#define DISABLE_HIST_STR "disable_hist"
+
+struct enable_trigger_data {
+ struct trace_event_file *file;
+ bool enable;
+ bool hist;
+};
+
+extern int event_enable_trigger_print(struct seq_file *m,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data);
+extern void event_enable_trigger_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data);
+extern int event_enable_trigger_func(struct event_command *cmd_ops,
+ struct trace_event_file *file,
+ char *glob, char *cmd, char *param);
+extern int event_enable_register_trigger(char *glob,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file);
+extern void event_enable_unregister_trigger(char *glob,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file);
extern void trigger_data_free(struct event_trigger_data *data);
extern int event_trigger_init(struct event_trigger_ops *ops,
struct event_trigger_data *data);
@@ -1197,6 +1227,8 @@ extern int set_trigger_filter(char *filter_str,
struct event_trigger_data *trigger_data,
struct trace_event_file *file);
extern int register_event_command(struct event_command *cmd);
+extern int unregister_event_command(struct event_command *cmd);
+extern int register_trigger_hist_enable_disable_cmds(void);
/**
* struct event_trigger_ops - callbacks for trace event triggers
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 90a7c93..49bd1f3 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1372,3 +1372,118 @@ __init int register_trigger_hist_cmd(void)
return ret;
}
+
+static void
+hist_enable_trigger(struct event_trigger_data *data, void *rec)
+{
+ struct enable_trigger_data *enable_data = data->private_data;
+ struct event_trigger_data *test;
+
+ list_for_each_entry_rcu(test, &enable_data->file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ if (enable_data->enable)
+ test->paused = false;
+ else
+ test->paused = true;
+ break;
+ }
+ }
+}
+
+static void
+hist_enable_count_trigger(struct event_trigger_data *data, void *rec)
+{
+ if (!data->count)
+ return;
+
+ if (data->count != -1)
+ (data->count)--;
+
+ hist_enable_trigger(data, rec);
+}
+
+static struct event_trigger_ops hist_enable_trigger_ops = {
+ .func = hist_enable_trigger,
+ .print = event_enable_trigger_print,
+ .init = event_trigger_init,
+ .free = event_enable_trigger_free,
+};
+
+static struct event_trigger_ops hist_enable_count_trigger_ops = {
+ .func = hist_enable_count_trigger,
+ .print = event_enable_trigger_print,
+ .init = event_trigger_init,
+ .free = event_enable_trigger_free,
+};
+
+static struct event_trigger_ops hist_disable_trigger_ops = {
+ .func = hist_enable_trigger,
+ .print = event_enable_trigger_print,
+ .init = event_trigger_init,
+ .free = event_enable_trigger_free,
+};
+
+static struct event_trigger_ops hist_disable_count_trigger_ops = {
+ .func = hist_enable_count_trigger,
+ .print = event_enable_trigger_print,
+ .init = event_trigger_init,
+ .free = event_enable_trigger_free,
+};
+
+static struct event_trigger_ops *
+hist_enable_get_trigger_ops(char *cmd, char *param)
+{
+ struct event_trigger_ops *ops;
+ bool enable;
+
+ enable = (strcmp(cmd, ENABLE_HIST_STR) == 0);
+
+ if (enable)
+ ops = param ? &hist_enable_count_trigger_ops :
+ &hist_enable_trigger_ops;
+ else
+ ops = param ? &hist_disable_count_trigger_ops :
+ &hist_disable_trigger_ops;
+
+ return ops;
+}
+
+static struct event_command trigger_hist_enable_cmd = {
+ .name = ENABLE_HIST_STR,
+ .trigger_type = ETT_HIST_ENABLE,
+ .func = event_enable_trigger_func,
+ .reg = event_enable_register_trigger,
+ .unreg = event_enable_unregister_trigger,
+ .get_trigger_ops = hist_enable_get_trigger_ops,
+ .set_filter = set_trigger_filter,
+};
+
+static struct event_command trigger_hist_disable_cmd = {
+ .name = DISABLE_HIST_STR,
+ .trigger_type = ETT_HIST_ENABLE,
+ .func = event_enable_trigger_func,
+ .reg = event_enable_register_trigger,
+ .unreg = event_enable_unregister_trigger,
+ .get_trigger_ops = hist_enable_get_trigger_ops,
+ .set_filter = set_trigger_filter,
+};
+
+static __init void unregister_trigger_hist_enable_disable_cmds(void)
+{
+ unregister_event_command(&trigger_hist_enable_cmd);
+ unregister_event_command(&trigger_hist_disable_cmd);
+}
+
+__init int register_trigger_hist_enable_disable_cmds(void)
+{
+ int ret;
+
+ ret = register_event_command(&trigger_hist_enable_cmd);
+ if (WARN_ON(ret < 0))
+ return ret;
+ ret = register_event_command(&trigger_hist_disable_cmd);
+ if (WARN_ON(ret < 0))
+ unregister_trigger_hist_enable_disable_cmds();
+
+ return ret;
+}
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 1f1db3c..2d057f2 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -352,7 +352,7 @@ __init int register_event_command(struct event_command *cmd)
* Currently we only unregister event commands from __init, so mark
* this __init too.
*/
-static __init int unregister_event_command(struct event_command *cmd)
+__init int unregister_event_command(struct event_command *cmd)
{
struct event_command *p, *n;
int ret = -ENODEV;
@@ -1067,15 +1067,6 @@ static __init void unregister_trigger_traceon_traceoff_cmds(void)
unregister_event_command(&trigger_traceoff_cmd);
}
-/* Avoid typos */
-#define ENABLE_EVENT_STR "enable_event"
-#define DISABLE_EVENT_STR "disable_event"
-
-struct enable_trigger_data {
- struct trace_event_file *file;
- bool enable;
-};
-
static void
event_enable_trigger(struct event_trigger_data *data, void *rec)
{
@@ -1105,14 +1096,16 @@ event_enable_count_trigger(struct event_trigger_data *data, void *rec)
event_enable_trigger(data, rec);
}
-static int
-event_enable_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
- struct event_trigger_data *data)
+int event_enable_trigger_print(struct seq_file *m,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
{
struct enable_trigger_data *enable_data = data->private_data;
seq_printf(m, "%s:%s:%s",
- enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR,
+ enable_data->hist ?
+ (enable_data->enable ? ENABLE_HIST_STR : DISABLE_HIST_STR) :
+ (enable_data->enable ? ENABLE_EVENT_STR : DISABLE_EVENT_STR),
enable_data->file->event_call->class->system,
trace_event_name(enable_data->file->event_call));
@@ -1129,9 +1122,8 @@ event_enable_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
return 0;
}
-static void
-event_enable_trigger_free(struct event_trigger_ops *ops,
- struct event_trigger_data *data)
+void event_enable_trigger_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
{
struct enable_trigger_data *enable_data = data->private_data;
@@ -1176,10 +1168,9 @@ static struct event_trigger_ops event_disable_count_trigger_ops = {
.free = event_enable_trigger_free,
};
-static int
-event_enable_trigger_func(struct event_command *cmd_ops,
- struct trace_event_file *file,
- char *glob, char *cmd, char *param)
+int event_enable_trigger_func(struct event_command *cmd_ops,
+ struct trace_event_file *file,
+ char *glob, char *cmd, char *param)
{
struct trace_event_file *event_enable_file;
struct enable_trigger_data *enable_data;
@@ -1188,6 +1179,7 @@ event_enable_trigger_func(struct event_command *cmd_ops,
struct trace_array *tr = file->tr;
const char *system;
const char *event;
+ bool hist = false;
char *trigger;
char *number;
bool enable;
@@ -1212,8 +1204,15 @@ event_enable_trigger_func(struct event_command *cmd_ops,
if (!event_enable_file)
goto out;
- enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
+#ifdef CONFIG_HIST_TRIGGERS
+ hist = ((strcmp(cmd, ENABLE_HIST_STR) == 0) ||
+ (strcmp(cmd, DISABLE_HIST_STR) == 0));
+ enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
+ (strcmp(cmd, ENABLE_HIST_STR) == 0));
+#else
+ enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
+#endif
trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
ret = -ENOMEM;
@@ -1233,6 +1232,7 @@ event_enable_trigger_func(struct event_command *cmd_ops,
INIT_LIST_HEAD(&trigger_data->list);
RCU_INIT_POINTER(trigger_data->filter, NULL);
+ enable_data->hist = hist;
enable_data->enable = enable;
enable_data->file = event_enable_file;
trigger_data->private_data = enable_data;
@@ -1310,10 +1310,10 @@ event_enable_trigger_func(struct event_command *cmd_ops,
goto out;
}
-static int event_enable_register_trigger(char *glob,
- struct event_trigger_ops *ops,
- struct event_trigger_data *data,
- struct trace_event_file *file)
+int event_enable_register_trigger(char *glob,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file)
{
struct enable_trigger_data *enable_data = data->private_data;
struct enable_trigger_data *test_enable_data;
@@ -1323,6 +1323,8 @@ static int event_enable_register_trigger(char *glob,
list_for_each_entry_rcu(test, &file->triggers, list) {
test_enable_data = test->private_data;
if (test_enable_data &&
+ (test->cmd_ops->trigger_type ==
+ data->cmd_ops->trigger_type) &&
(test_enable_data->file == enable_data->file)) {
ret = -EEXIST;
goto out;
@@ -1348,10 +1350,10 @@ out:
return ret;
}
-static void event_enable_unregister_trigger(char *glob,
- struct event_trigger_ops *ops,
- struct event_trigger_data *test,
- struct trace_event_file *file)
+void event_enable_unregister_trigger(char *glob,
+ struct event_trigger_ops *ops,
+ struct event_trigger_data *test,
+ struct trace_event_file *file)
{
struct enable_trigger_data *test_enable_data = test->private_data;
struct enable_trigger_data *enable_data;
@@ -1361,6 +1363,8 @@ static void event_enable_unregister_trigger(char *glob,
list_for_each_entry_rcu(data, &file->triggers, list) {
enable_data = data->private_data;
if (enable_data &&
+ (data->cmd_ops->trigger_type ==
+ test->cmd_ops->trigger_type) &&
(enable_data->file == test_enable_data->file)) {
unregistered = true;
list_del_rcu(&data->list);
@@ -1380,8 +1384,12 @@ event_enable_get_trigger_ops(char *cmd, char *param)
struct event_trigger_ops *ops;
bool enable;
+#ifdef CONFIG_HIST_TRIGGERS
+ enable = ((strcmp(cmd, ENABLE_EVENT_STR) == 0) ||
+ (strcmp(cmd, ENABLE_HIST_STR) == 0));
+#else
enable = strcmp(cmd, ENABLE_EVENT_STR) == 0;
-
+#endif
if (enable)
ops = param ? &event_enable_count_trigger_ops :
&event_enable_trigger_ops;
@@ -1452,6 +1460,7 @@ __init int register_trigger_cmds(void)
register_trigger_snapshot_cmd();
register_trigger_stacktrace_cmd();
register_trigger_enable_disable_cmds();
+ register_trigger_hist_enable_disable_cmds();
register_trigger_hist_cmd();
return 0;
--
1.9.3
Add documentation and usage examples for 'hist' triggers.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
Documentation/trace/events.txt | 1155 ++++++++++++++++++++++++++++++++++++++++
1 file changed, 1155 insertions(+)
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index c010be8..db223e8 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -512,3 +512,1158 @@ The following commands are supported:
Note that there can be only one traceon or traceoff trigger per
triggering event.
+
+- hist
+
+ This command aggregates event hits into a hash table keyed on one or
+ more trace event format fields (or stacktrace) and a set of running
+ totals derived from one or more trace event format fields and/or
+ event counts (hitcount).
+
+ The format of a hist trigger is as follows:
+
+ hist:keys=<field1[,field2,...]>[:values=<field1[,field2,...]>]
+ [:sort=<field1[,field2,...]>][:size=#entries][:pause][:continue]
+ [:clear] [if <filter>]
+
+ When a matching event is hit, an entry is added to a hash table
+ using the key(s) and value(s) named. Keys and values correspond to
+ fields in the event's format description. Values must correspond to
+ numeric fields - on an event hit, the value(s) will be added to a
+ sum kept for that field. The special string 'hitcount' can be used
+ in place of an explicit value field - this is simply a count of
+ event hits. If 'values' isn't specified, an implicit 'hitcount'
+ value will be automatically created and used as the only value.
+ Keys can be any field, or the special string 'stacktrace', which
+ will use the event's kernel stacktrace as the key. The keywords
+ 'keys' or 'key' can be used to specify keys, and the keywords
+ 'values', 'vals', or 'val' can be used to specify values. Compound
+ keys consisting of up to two fields can be specified by the 'keys'
+ keyword. Hashing a compound key produces a unique entry in the
+ table for each unique combination of component keys, and can be
+ useful for providing more fine-grained summaries of event data.
+ Additionally, sort keys consisting of up to two fields can be
+ specified by the 'sort' keyword. If more than one field is
+ specified, the result will be a 'sort within a sort': the first key
+ is taken to be the primary sort key and the second the secondary
+ key.
+
+ 'hist' triggers add a 'hist' file to each event's subdirectory.
+ Reading the 'hist' file for the event will dump the hash table in
+ its entirety to stdout. Each printed hash table entry is a simple
+ list of the keys and values comprising the entry; keys are printed
+ first and are delineated by curly braces, and are followed by the
+ set of value fields for the entry. By default, numeric fields are
+ displayed as base-10 integers. This can be modified by appending
+ any of the following modifiers to the field name:
+
+ .hex display a number as a hex value
+ .sym display an address as a symbol
+ .sym-offset display an address as a symbol and offset
+ .syscall display a syscall id as a system call name
+ .execname display a common_pid as a program name
+
+ Note that in general the semantics of a given field aren't
+ interpreted when applying a modifier to it, but there are some
+ restrictions to be aware of in this regard:
+
+ - only the 'hex' modifier can be used for values (because values
+ are essentially sums, and the other modifiers don't make sense
+ in that context).
+ - the 'execname' modifier can only be used on a 'common_pid'. The
+ reason for this is that the execname is simply the 'comm' value
+ saved for the 'current' process when an event was triggered,
+ which is the same as the common_pid value saved by the event
+ tracing code. Trying to apply that comm value to other pid
+ values wouldn't be correct, and typically events that care save
+ pid-specific comm fields in the event itself.
+
+ A typical usage scenario would be the following to enable a hist
+ trigger, read its current contents, and then turn it off:
+
+ # echo 'hist:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist
+
+ # echo '!hist:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ The trigger file itself can be read to show the details of the
+ currently attached hist trigger. This information is also displayed
+ at the top of the 'hist' file when read.
+
+ By default, the size of the hash table is 2048 entries. The 'size'
+ parameter can be used to specify more or fewer than that. The units
+ are in terms of hashtable entries - if a run uses more entries than
+ specified, the results will show the number of 'drops', the number
+ of hits that were ignored. The size should be a power of 2 between
+ 128 and 131072 (any non- power-of-2 number specified will be rounded
+ up).
+
+ The 'sort' parameter can be used to specify a value field to sort
+ on. The default if unspecified is 'hitcount' and the default sort
+ order is 'ascending'. To sort in the opposite direction, append
+ .descending' to the sort key.
+
+ The 'pause' parameter can be used to pause an existing hist trigger
+ or to start a hist trigger but not log any events until told to do
+ so. 'continue' or 'cont' can be used to start or restart a paused
+ hist trigger.
+
+ The 'clear' parameter will clear the contents of a running hist
+ trigger and leave its current paused/active state.
+
+ Note that the 'pause', 'cont', and 'clear' parameters should be
+ applied using 'append' shell operator ('>>') if applied to an
+ existing trigger, rather than via the '>' operator, which will cause
+ the trigger to be removed through truncation.
+
+- enable_hist/disable_hist
+
+ The enable_hist and disable_hist triggers can be used to have one
+ event conditionally start and stop another event's already-attached
+ hist trigger. Any number of enable_hist and disable_hist triggers
+ can be attached to a given event, allowing that event to kick off
+ and stop aggregations on a host of other events.
+
+ The format is very similar to the enable/disable_event triggers:
+
+ enable_hist:<system>:<event>[:count]
+ disable_hist:<system>:<event>[:count]
+
+ Instead of enabling or disabling the tracing of the target event
+ into the trace buffer as the enable/disable_event triggers do, the
+ enable/disable_hist triggers enable or disable the aggregation of
+ the target event into a hash table.
+
+ A typical usage scenario for the enable_hist/disable_hist triggers
+ would be to first set up a paused hist trigger on some event,
+ followed by an enable_hist/disable_hist pair that turns the hist
+ aggregation on and off when conditions of interest are hit:
+
+ # echo 'hist:keys=skbaddr.hex:vals=len:pause' > \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+
+ # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger
+
+ # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger
+
+ The above sets up an initially paused hist trigger which is unpaused
+ and starts aggregating events when a given program is executed, and
+ which stops aggregating when the process exits and the hist trigger
+ is paused again.
+
+ The examples below provide a more concrete illustration of the
+ concepts and typical usage patterns discussed above.
+
+
+6.2 'hist' trigger examples
+---------------------------
+
+ The first set of examples creates aggregations using the kmalloc
+ event. The fields that can be used for the hist trigger are listed
+ in the kmalloc event's format file:
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/format
+ name: kmalloc
+ ID: 374
+ format:
+ field:unsigned short common_type; offset:0; size:2; signed:0;
+ field:unsigned char common_flags; offset:2; size:1; signed:0;
+ field:unsigned char common_preempt_count; offset:3; size:1; signed:0;
+ field:int common_pid; offset:4; size:4; signed:1;
+
+ field:unsigned long call_site; offset:8; size:8; signed:0;
+ field:const void * ptr; offset:16; size:8; signed:0;
+ field:size_t bytes_req; offset:24; size:8; signed:0;
+ field:size_t bytes_alloc; offset:32; size:8; signed:0;
+ field:gfp_t gfp_flags; offset:40; size:4; signed:0;
+
+ We'll start by creating a hist trigger that generates a simple table
+ that lists the total number of bytes requested for each function in
+ the kernel that made one or more calls to kmalloc:
+
+ # echo 'hist:key=call_site:val=bytes_req' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ This tells the tracing system to create a 'hist' trigger using the
+ call_site field of the kmalloc event as the key for the table, which
+ just means that each unique call_site address will have an entry
+ created for it in the table. The 'val=bytes_req' parameter tells
+ the hist trigger that for each unique entry (call_site) in the
+ table, it should keep a running total of the number of bytes
+ requested by that call_site.
+
+ We'll let it run for awhile and then dump the contents of the 'hist'
+ file in the kmalloc event's subdirectory (for readability, a number
+ of entries have been omitted):
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active]
+
+ { call_site: 18446744072106379007 } hitcount: 1 bytes_req: 176
+ { call_site: 18446744071579557049 } hitcount: 1 bytes_req: 1024
+ { call_site: 18446744071580608289 } hitcount: 1 bytes_req: 16384
+ { call_site: 18446744071581827654 } hitcount: 1 bytes_req: 24
+ { call_site: 18446744071580700980 } hitcount: 1 bytes_req: 8
+ { call_site: 18446744071579359876 } hitcount: 1 bytes_req: 152
+ { call_site: 18446744071580795365 } hitcount: 3 bytes_req: 144
+ { call_site: 18446744071581303129 } hitcount: 3 bytes_req: 144
+ { call_site: 18446744071580713234 } hitcount: 4 bytes_req: 2560
+ { call_site: 18446744071580933750 } hitcount: 4 bytes_req: 736
+ .
+ .
+ .
+ { call_site: 18446744072106047046 } hitcount: 69 bytes_req: 5576
+ { call_site: 18446744071582116407 } hitcount: 73 bytes_req: 2336
+ { call_site: 18446744072106054684 } hitcount: 136 bytes_req: 140504
+ { call_site: 18446744072106224230 } hitcount: 136 bytes_req: 19584
+ { call_site: 18446744072106078074 } hitcount: 153 bytes_req: 2448
+ { call_site: 18446744072106062406 } hitcount: 153 bytes_req: 36720
+ { call_site: 18446744071582507929 } hitcount: 153 bytes_req: 37088
+ { call_site: 18446744072102520590 } hitcount: 273 bytes_req: 10920
+ { call_site: 18446744071582143559 } hitcount: 358 bytes_req: 716
+ { call_site: 18446744072106465852 } hitcount: 417 bytes_req: 56712
+ { call_site: 18446744072102523378 } hitcount: 485 bytes_req: 27160
+ { call_site: 18446744072099568646 } hitcount: 1676 bytes_req: 33520
+
+ Totals:
+ Hits: 4610
+ Entries: 45
+ Dropped: 0
+
+ The output displays a line for each entry, beginning with the key
+ specified in the trigger, followed by the value(s) also specified in
+ the trigger. At the beginning of the output is a line that displays
+ the trigger info, which can also be displayed by reading the
+ 'trigger' file:
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+ hist:keys=call_site:vals=bytes_req:sort=hitcount:size=2048 [active]
+
+ At the end of the output are a few lines that display the overall
+ totals for the run. The 'Hits' field shows the total number of
+ times the event trigger was hit, the 'Entries' field shows the total
+ number of used entries in the hash table, and the 'Dropped' field
+ shows the number of hits that were dropped because the number of
+ used entries for the run exceeded the maximum number of entries
+ allowed for the table (normally 0, but if not a hint that you may
+ want to increase the size of the table using the 'size' parameter).
+
+ Notice in the above output that there's an extra field, 'hitcount',
+ which wasn't specified in the trigger. Also notice that in the
+ trigger info output, there's a parameter, 'sort=hitcount', which
+ wasn't specified in the trigger either. The reason for that is that
+ every trigger implicitly keeps a count of the total number of hits
+ attributed to a given entry, called the 'hitcount'. That hitcount
+ information is explicitly displayed in the output, and in the
+ absence of a user-specified sort parameter, is used as the default
+ sort field.
+
+ The value 'hitcount' can be used in place of an explicit value in
+ the 'values' parameter if you don't really need to have any
+ particular field summed and are mainly interested in hit
+ frequencies.
+
+ To turn the hist trigger off, simply call up the trigger in the
+ command history and re-execute it with a '!' prepended:
+
+ # echo '!hist:key=call_site:val=bytes_req' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ Finally, notice that the call_site as displayed in the output above
+ isn't really very useful. It's an address, but normally addresses
+ are displayed in hex. To have a numeric field displayed as a hex
+ value, simply append '.hex' to the field name in the trigger:
+
+ # echo 'hist:key=call_site.hex:val=bytes_req' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site.hex:vals=bytes_req:sort=hitcount:size=2048 [active]
+
+ { call_site: ffffffffa026b291 } hitcount: 1 bytes_req: 433
+ { call_site: ffffffffa07186ff } hitcount: 1 bytes_req: 176
+ { call_site: ffffffff811ae721 } hitcount: 1 bytes_req: 16384
+ { call_site: ffffffff811c5134 } hitcount: 1 bytes_req: 8
+ { call_site: ffffffffa04a9ebb } hitcount: 1 bytes_req: 511
+ { call_site: ffffffff8122e0a6 } hitcount: 1 bytes_req: 12
+ { call_site: ffffffff8107da84 } hitcount: 1 bytes_req: 152
+ { call_site: ffffffff812d8246 } hitcount: 1 bytes_req: 24
+ { call_site: ffffffff811dc1e5 } hitcount: 3 bytes_req: 144
+ { call_site: ffffffffa02515e8 } hitcount: 3 bytes_req: 648
+ { call_site: ffffffff81258159 } hitcount: 3 bytes_req: 144
+ { call_site: ffffffff811c80f4 } hitcount: 4 bytes_req: 544
+ .
+ .
+ .
+ { call_site: ffffffffa06c7646 } hitcount: 106 bytes_req: 8024
+ { call_site: ffffffffa06cb246 } hitcount: 132 bytes_req: 31680
+ { call_site: ffffffffa06cef7a } hitcount: 132 bytes_req: 2112
+ { call_site: ffffffff8137e399 } hitcount: 132 bytes_req: 23232
+ { call_site: ffffffffa06c941c } hitcount: 185 bytes_req: 171360
+ { call_site: ffffffffa06f2a66 } hitcount: 185 bytes_req: 26640
+ { call_site: ffffffffa036a70e } hitcount: 265 bytes_req: 10600
+ { call_site: ffffffff81325447 } hitcount: 292 bytes_req: 584
+ { call_site: ffffffffa072da3c } hitcount: 446 bytes_req: 60656
+ { call_site: ffffffffa036b1f2 } hitcount: 526 bytes_req: 29456
+ { call_site: ffffffffa0099c06 } hitcount: 1780 bytes_req: 35600
+
+ Totals:
+ Hits: 4775
+ Entries: 46
+ Dropped: 0
+
+ Even that's only marginally more useful - while hex values do look
+ more like addresses, what users are typically more interested in
+ when looking at text addresses are the corresponding symbols
+ instead. To have an address displayed as symbolic value instead,
+ simply append '.sym' or '.sym-offset' to the field name in the
+ trigger:
+
+ # echo 'hist:key=call_site.sym:val=bytes_req' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=hitcount:size=2048 [active]
+
+ { call_site: [ffffffff810adcb9] syslog_print_all } hitcount: 1 bytes_req: 1024
+ { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8
+ { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7
+ { call_site: [ffffffff8154acbe] usb_alloc_urb } hitcount: 1 bytes_req: 192
+ { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7
+ { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40
+ { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128
+ { call_site: [ffffffff811febd5] fsnotify_alloc_group } hitcount: 2 bytes_req: 528
+ { call_site: [ffffffff81440f58] __tty_buffer_request_room } hitcount: 2 bytes_req: 2624
+ { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 2 bytes_req: 96
+ { call_site: [ffffffffa05e19af] ieee80211_start_tx_ba_session [mac80211] } hitcount: 2 bytes_req: 464
+ { call_site: [ffffffff81672406] tcp_get_metrics } hitcount: 2 bytes_req: 304
+ { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128
+ { call_site: [ffffffff81089b05] sched_create_group } hitcount: 2 bytes_req: 1424
+ .
+ .
+ .
+ { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1185 bytes_req: 123240
+ { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 1185 bytes_req: 104280
+ { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 1402 bytes_req: 190672
+ { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 1518 bytes_req: 146208
+ { call_site: [ffffffffa029070e] drm_vma_node_allow [drm] } hitcount: 1746 bytes_req: 69840
+ { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 2021 bytes_req: 792312
+ { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 2592 bytes_req: 145152
+ { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2629 bytes_req: 378576
+ { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2629 bytes_req: 3783248
+ { call_site: [ffffffff81325607] apparmor_file_alloc_security } hitcount: 5192 bytes_req: 10384
+ { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 5529 bytes_req: 110584
+ { call_site: [ffffffff8131ebf7] aa_alloc_task_context } hitcount: 21943 bytes_req: 702176
+ { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 55759 bytes_req: 5074265
+
+ Totals:
+ Hits: 109928
+ Entries: 71
+ Dropped: 0
+
+ Because the default sort key above is 'hitcount', the above shows a
+ the list of call_sites by increasing hitcount, so that at the bottom
+ we see the functions that made the most kmalloc calls during the
+ run. If instead we we wanted to see the top kmalloc callers in
+ terms of the number of bytes requested rather than the number of
+ calls, and we wanted the top caller to appear at the top, we can use
+ the 'sort' parameter, along with the 'descending' modifier:
+
+ # echo 'hist:key=call_site.sym:val=bytes_req:sort=bytes_req.descending' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site.sym:vals=bytes_req:sort=bytes_req.descending:size=2048 [active]
+
+ { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 2186 bytes_req: 3397464
+ { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1790 bytes_req: 712176
+ { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 8132 bytes_req: 513135
+ { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 106 bytes_req: 440128
+ { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 2186 bytes_req: 314784
+ { call_site: [ffffffff812891ca] ext4_find_extent } hitcount: 2174 bytes_req: 208992
+ { call_site: [ffffffff811ae8e1] __kmalloc } hitcount: 8 bytes_req: 131072
+ { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 859 bytes_req: 116824
+ { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 1834 bytes_req: 102704
+ { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 972 bytes_req: 101088
+ { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl [drm] } hitcount: 972 bytes_req: 85536
+ { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 3333 bytes_req: 66664
+ { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 209 bytes_req: 61632
+ .
+ .
+ .
+ { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128
+ { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128
+ { call_site: [ffffffff812d8406] copy_semundo } hitcount: 2 bytes_req: 48
+ { call_site: [ffffffff81200ba6] inotify_new_group } hitcount: 1 bytes_req: 48
+ { call_site: [ffffffffa027121a] drm_getmagic [drm] } hitcount: 1 bytes_req: 48
+ { call_site: [ffffffff811e3a25] __seq_open_private } hitcount: 1 bytes_req: 40
+ { call_site: [ffffffff811c52f4] bprm_change_interp } hitcount: 2 bytes_req: 16
+ { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8
+ { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7
+ { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7
+
+ Totals:
+ Hits: 32133
+ Entries: 81
+ Dropped: 0
+
+ To display the offset and size information in addition to the symbol
+ name, just use 'sym-offset' instead:
+
+ # echo 'hist:key=call_site.sym-offset:val=bytes_req:sort=bytes_req.descending' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site.sym-offset:vals=bytes_req:sort=bytes_req.descending:size=2048 [active]
+
+ { call_site: [ffffffffa046041c] i915_gem_execbuffer2+0x6c/0x2c0 [i915] } hitcount: 4569 bytes_req: 3163720
+ { call_site: [ffffffffa0489a66] intel_ring_begin+0xc6/0x1f0 [i915] } hitcount: 4569 bytes_req: 657936
+ { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23+0x694/0x1020 [i915] } hitcount: 1519 bytes_req: 472936
+ { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23+0x516/0x1020 [i915] } hitcount: 3050 bytes_req: 211832
+ { call_site: [ffffffff811e2a1b] seq_buf_alloc+0x1b/0x50 } hitcount: 34 bytes_req: 148384
+ { call_site: [ffffffffa04a580c] intel_crtc_page_flip+0xbc/0x870 [i915] } hitcount: 1385 bytes_req: 144040
+ { call_site: [ffffffff811ae8e1] __kmalloc+0x191/0x1b0 } hitcount: 8 bytes_req: 131072
+ { call_site: [ffffffffa0287592] drm_mode_page_flip_ioctl+0x282/0x360 [drm] } hitcount: 1385 bytes_req: 121880
+ { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc+0x32/0x100 [drm] } hitcount: 1848 bytes_req: 103488
+ { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state+0x2c/0xa0 [i915] } hitcount: 461 bytes_req: 62696
+ { call_site: [ffffffffa029070e] drm_vma_node_allow+0x2e/0xd0 [drm] } hitcount: 1541 bytes_req: 61640
+ { call_site: [ffffffff815f8d7b] sk_prot_alloc+0xcb/0x1b0 } hitcount: 57 bytes_req: 57456
+ .
+ .
+ .
+ { call_site: [ffffffff8109524a] alloc_fair_sched_group+0x5a/0x1a0 } hitcount: 2 bytes_req: 128
+ { call_site: [ffffffffa027b921] drm_vm_open_locked+0x31/0xa0 [drm] } hitcount: 3 bytes_req: 96
+ { call_site: [ffffffff8122e266] proc_self_follow_link+0x76/0xb0 } hitcount: 8 bytes_req: 96
+ { call_site: [ffffffff81213e80] load_elf_binary+0x240/0x1650 } hitcount: 3 bytes_req: 84
+ { call_site: [ffffffff8154bc62] usb_control_msg+0x42/0x110 } hitcount: 1 bytes_req: 8
+ { call_site: [ffffffffa00bf6fe] hidraw_send_report+0x7e/0x1a0 [hid] } hitcount: 1 bytes_req: 7
+ { call_site: [ffffffffa00bf1ca] hidraw_report_event+0x8a/0x120 [hid] } hitcount: 1 bytes_req: 7
+
+ Totals:
+ Hits: 26098
+ Entries: 64
+ Dropped: 0
+
+ We can also add multiple fields to the 'values' parameter. For
+ example, we might want to see the total number of bytes allocated
+ alongside bytes requested, and display the result sorted by bytes
+ allocated in a descending order:
+
+ # echo 'hist:keys=call_site.sym:values=bytes_req,bytes_alloc:sort=bytes_alloc.descending' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=call_site.sym:vals=bytes_req,bytes_alloc:sort=bytes_alloc.descending:size=2048 [active]
+
+ { call_site: [ffffffffa046041c] i915_gem_execbuffer2 [i915] } hitcount: 7403 bytes_req: 4084360 bytes_alloc: 5958016
+ { call_site: [ffffffff811e2a1b] seq_buf_alloc } hitcount: 541 bytes_req: 2213968 bytes_alloc: 2228224
+ { call_site: [ffffffffa0489a66] intel_ring_begin [i915] } hitcount: 7404 bytes_req: 1066176 bytes_alloc: 1421568
+ { call_site: [ffffffffa045e7c4] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 1565 bytes_req: 557368 bytes_alloc: 1037760
+ { call_site: [ffffffff8125847d] ext4_htree_store_dirent } hitcount: 9557 bytes_req: 595778 bytes_alloc: 695744
+ { call_site: [ffffffffa045e646] i915_gem_do_execbuffer.isra.23 [i915] } hitcount: 5839 bytes_req: 430680 bytes_alloc: 470400
+ { call_site: [ffffffffa04c4a3c] intel_plane_duplicate_state [i915] } hitcount: 2388 bytes_req: 324768 bytes_alloc: 458496
+ { call_site: [ffffffffa02911f2] drm_modeset_lock_crtc [drm] } hitcount: 3911 bytes_req: 219016 bytes_alloc: 250304
+ { call_site: [ffffffff815f8d7b] sk_prot_alloc } hitcount: 235 bytes_req: 236880 bytes_alloc: 240640
+ { call_site: [ffffffff8137e559] sg_kmalloc } hitcount: 557 bytes_req: 169024 bytes_alloc: 221760
+ { call_site: [ffffffffa00b7c06] hid_report_raw_event [hid] } hitcount: 9378 bytes_req: 187548 bytes_alloc: 206312
+ { call_site: [ffffffffa04a580c] intel_crtc_page_flip [i915] } hitcount: 1519 bytes_req: 157976 bytes_alloc: 194432
+ .
+ .
+ .
+ { call_site: [ffffffff8109bd3b] sched_autogroup_create_attach } hitcount: 2 bytes_req: 144 bytes_alloc: 192
+ { call_site: [ffffffff81097ee8] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128
+ { call_site: [ffffffff8109524a] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128
+ { call_site: [ffffffff81095225] alloc_fair_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128
+ { call_site: [ffffffff81097ec2] alloc_rt_sched_group } hitcount: 2 bytes_req: 128 bytes_alloc: 128
+ { call_site: [ffffffff81213e80] load_elf_binary } hitcount: 3 bytes_req: 84 bytes_alloc: 96
+ { call_site: [ffffffff81079a2e] kthread_create_on_node } hitcount: 1 bytes_req: 56 bytes_alloc: 64
+ { call_site: [ffffffffa00bf6fe] hidraw_send_report [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8
+ { call_site: [ffffffff8154bc62] usb_control_msg } hitcount: 1 bytes_req: 8 bytes_alloc: 8
+ { call_site: [ffffffffa00bf1ca] hidraw_report_event [hid] } hitcount: 1 bytes_req: 7 bytes_alloc: 8
+
+ Totals:
+ Hits: 66598
+ Entries: 65
+ Dropped: 0
+
+ Finally, to finish off our kmalloc example, instead of simply having
+ the hist trigger display symbolic call_sites, we can have the hist
+ trigger additionally display the complete set of kernel stack traces
+ that led to each call_site. To do that, we simply use the special
+ value 'stacktrace' for the key parameter:
+
+ # echo 'hist:keys=stacktrace:values=bytes_req,bytes_alloc:sort=bytes_alloc' > \
+ /sys/kernel/debug/tracing/events/kmem/kmalloc/trigger
+
+ The above trigger will use the kernel stack trace in effect when an
+ event is triggered as the key for the hash table. This allows the
+ enumeration of every kernel callpath that led up to a particular
+ event, along with a running total of any of the event fields for
+ that event. Here we tally bytes requested and bytes allocated for
+ every callpath in the system that led up to a kmalloc (in this case
+ every callpath to a kmalloc for a kernel compile):
+
+ # cat /sys/kernel/debug/tracing/events/kmem/kmalloc/hist
+ # trigger info: hist:keys=stacktrace:vals=bytes_req,bytes_alloc:sort=bytes_alloc:size=2048 [active]
+
+ { stacktrace:
+ __kmalloc_track_caller+0x10b/0x1a0
+ kmemdup+0x20/0x50
+ hidraw_report_event+0x8a/0x120 [hid]
+ hid_report_raw_event+0x3ea/0x440 [hid]
+ hid_input_report+0x112/0x190 [hid]
+ hid_irq_in+0xc2/0x260 [usbhid]
+ __usb_hcd_giveback_urb+0x72/0x120
+ usb_giveback_urb_bh+0x9e/0xe0
+ tasklet_hi_action+0xf8/0x100
+ __do_softirq+0x114/0x2c0
+ irq_exit+0xa5/0xb0
+ do_IRQ+0x5a/0xf0
+ ret_from_intr+0x0/0x30
+ cpuidle_enter+0x17/0x20
+ cpu_startup_entry+0x315/0x3e0
+ rest_init+0x7c/0x80
+ } hitcount: 3 bytes_req: 21 bytes_alloc: 24
+ { stacktrace:
+ __kmalloc_track_caller+0x10b/0x1a0
+ kmemdup+0x20/0x50
+ hidraw_report_event+0x8a/0x120 [hid]
+ hid_report_raw_event+0x3ea/0x440 [hid]
+ hid_input_report+0x112/0x190 [hid]
+ hid_irq_in+0xc2/0x260 [usbhid]
+ __usb_hcd_giveback_urb+0x72/0x120
+ usb_giveback_urb_bh+0x9e/0xe0
+ tasklet_hi_action+0xf8/0x100
+ __do_softirq+0x114/0x2c0
+ irq_exit+0xa5/0xb0
+ do_IRQ+0x5a/0xf0
+ ret_from_intr+0x0/0x30
+ } hitcount: 3 bytes_req: 21 bytes_alloc: 24
+ { stacktrace:
+ kmem_cache_alloc_trace+0xeb/0x150
+ aa_alloc_task_context+0x27/0x40
+ apparmor_cred_prepare+0x1f/0x50
+ security_prepare_creds+0x16/0x20
+ prepare_creds+0xdf/0x1a0
+ SyS_capset+0xb5/0x200
+ system_call_fastpath+0x12/0x6a
+ } hitcount: 1 bytes_req: 32 bytes_alloc: 32
+ .
+ .
+ .
+ { stacktrace:
+ __kmalloc+0x11b/0x1b0
+ i915_gem_execbuffer2+0x6c/0x2c0 [i915]
+ drm_ioctl+0x349/0x670 [drm]
+ do_vfs_ioctl+0x2f0/0x4f0
+ SyS_ioctl+0x81/0xa0
+ system_call_fastpath+0x12/0x6a
+ } hitcount: 17726 bytes_req: 13944120 bytes_alloc: 19593808
+ { stacktrace:
+ __kmalloc+0x11b/0x1b0
+ load_elf_phdrs+0x76/0xa0
+ load_elf_binary+0x102/0x1650
+ search_binary_handler+0x97/0x1d0
+ do_execveat_common.isra.34+0x551/0x6e0
+ SyS_execve+0x3a/0x50
+ return_from_execve+0x0/0x23
+ } hitcount: 33348 bytes_req: 17152128 bytes_alloc: 20226048
+ { stacktrace:
+ kmem_cache_alloc_trace+0xeb/0x150
+ apparmor_file_alloc_security+0x27/0x40
+ security_file_alloc+0x16/0x20
+ get_empty_filp+0x93/0x1c0
+ path_openat+0x31/0x5f0
+ do_filp_open+0x3a/0x90
+ do_sys_open+0x128/0x220
+ SyS_open+0x1e/0x20
+ system_call_fastpath+0x12/0x6a
+ } hitcount: 4766422 bytes_req: 9532844 bytes_alloc: 38131376
+ { stacktrace:
+ __kmalloc+0x11b/0x1b0
+ seq_buf_alloc+0x1b/0x50
+ seq_read+0x2cc/0x370
+ proc_reg_read+0x3d/0x80
+ __vfs_read+0x28/0xe0
+ vfs_read+0x86/0x140
+ SyS_read+0x46/0xb0
+ system_call_fastpath+0x12/0x6a
+ } hitcount: 19133 bytes_req: 78368768 bytes_alloc: 78368768
+
+ Totals:
+ Hits: 6085872
+ Entries: 253
+ Dropped: 0
+
+ If you key a hist trigger on common_pid, in order for example to
+ gather and display sorted totals for each process, you can use the
+ special .execname modifier to display the executable names for the
+ processes in the table rather than raw pids. The example below
+ keeps a per-process sum of total bytes read:
+
+ # echo 'hist:key=common_pid.execname:val=count:sort=count.descending' > \
+ /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/trigger
+
+ # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_read/hist
+ # trigger info: hist:keys=common_pid.execname:vals=count:sort=count.descending:size=2048 [active]
+
+ { common_pid: gnome-terminal [ 3196] } hitcount: 280 count: 1093512
+ { common_pid: Xorg [ 1309] } hitcount: 525 count: 256640
+ { common_pid: compiz [ 2889] } hitcount: 59 count: 254400
+ { common_pid: bash [ 8710] } hitcount: 3 count: 66369
+ { common_pid: dbus-daemon-lau [ 8703] } hitcount: 49 count: 47739
+ { common_pid: irqbalance [ 1252] } hitcount: 27 count: 27648
+ { common_pid: 01ifupdown [ 8705] } hitcount: 3 count: 17216
+ { common_pid: dbus-daemon [ 772] } hitcount: 10 count: 12396
+ { common_pid: Socket Thread [ 8342] } hitcount: 11 count: 11264
+ { common_pid: nm-dhcp-client. [ 8701] } hitcount: 6 count: 7424
+ { common_pid: gmain [ 1315] } hitcount: 18 count: 6336
+ .
+ .
+ .
+ { common_pid: postgres [ 1892] } hitcount: 2 count: 32
+ { common_pid: postgres [ 1891] } hitcount: 2 count: 32
+ { common_pid: gmain [ 8704] } hitcount: 2 count: 32
+ { common_pid: upstart-dbus-br [ 2740] } hitcount: 21 count: 21
+ { common_pid: nm-dispatcher.a [ 8696] } hitcount: 1 count: 16
+ { common_pid: indicator-datet [ 2904] } hitcount: 1 count: 16
+ { common_pid: gdbus [ 2998] } hitcount: 1 count: 16
+ { common_pid: rtkit-daemon [ 2052] } hitcount: 1 count: 8
+ { common_pid: init [ 1] } hitcount: 2 count: 2
+
+ Totals:
+ Hits: 2116
+ Entries: 51
+ Dropped: 0
+
+ Similarly, if you key a hist trigger on syscall id, for example to
+ gather and display a list of systemwide syscall hits, you can use
+ the special .syscall modifier to display the syscall names rather
+ than raw ids. The example below keeps a running total of syscall
+ counts for the system during the run:
+
+ # echo 'hist:key=id.syscall:val=hitcount' > \
+ /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
+
+ # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
+ # trigger info: hist:keys=id.syscall:vals=hitcount:sort=hitcount:size=2048 [active]
+
+ { id: sys_fsync [ 74] } hitcount: 1
+ { id: sys_newuname [ 63] } hitcount: 1
+ { id: sys_prctl [157] } hitcount: 1
+ { id: sys_statfs [137] } hitcount: 1
+ { id: sys_symlink [ 88] } hitcount: 1
+ { id: sys_sendmmsg [307] } hitcount: 1
+ { id: sys_semctl [ 66] } hitcount: 1
+ { id: sys_readlink [ 89] } hitcount: 3
+ { id: sys_bind [ 49] } hitcount: 3
+ { id: sys_getsockname [ 51] } hitcount: 3
+ { id: sys_unlink [ 87] } hitcount: 3
+ { id: sys_rename [ 82] } hitcount: 4
+ { id: unknown_syscall [ 58] } hitcount: 4
+ { id: sys_connect [ 42] } hitcount: 4
+ { id: sys_getpid [ 39] } hitcount: 4
+ .
+ .
+ .
+ { id: sys_rt_sigprocmask [ 14] } hitcount: 952
+ { id: sys_futex [202] } hitcount: 1534
+ { id: sys_write [ 1] } hitcount: 2689
+ { id: sys_setitimer [ 38] } hitcount: 2797
+ { id: sys_read [ 0] } hitcount: 3202
+ { id: sys_select [ 23] } hitcount: 3773
+ { id: sys_writev [ 20] } hitcount: 4531
+ { id: sys_poll [ 7] } hitcount: 8314
+ { id: sys_recvmsg [ 47] } hitcount: 13738
+ { id: sys_ioctl [ 16] } hitcount: 21843
+
+ Totals:
+ Hits: 67612
+ Entries: 72
+ Dropped: 0
+
+ The syscall counts above provide a rough overall picture of system
+ call activity on the system; we can see for example that the most
+ popular system call on this system was the 'sys_ioctl' system call.
+
+ We can use 'compound' keys to refine that number and provide some
+ further insight as to which processes exactly contribute to the
+ overall ioctl count.
+
+ The command below keeps a hitcount for every unique combination of
+ system call id and pid - the end result is essentially a table
+ that keeps a per-pid sum of system call hits. The results are
+ sorted using the system call id as the primary key, and the
+ hitcount sum as the secondary key:
+
+ # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount' > \
+ /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
+
+ # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
+ # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 [active]
+
+ { id: sys_read [ 0], common_pid: rtkit-daemon [ 1877] } hitcount: 1
+ { id: sys_read [ 0], common_pid: gdbus [ 2976] } hitcount: 1
+ { id: sys_read [ 0], common_pid: console-kit-dae [ 3400] } hitcount: 1
+ { id: sys_read [ 0], common_pid: postgres [ 1865] } hitcount: 1
+ { id: sys_read [ 0], common_pid: deja-dup-monito [ 3543] } hitcount: 2
+ { id: sys_read [ 0], common_pid: NetworkManager [ 890] } hitcount: 2
+ { id: sys_read [ 0], common_pid: evolution-calen [ 3048] } hitcount: 2
+ { id: sys_read [ 0], common_pid: postgres [ 1864] } hitcount: 2
+ { id: sys_read [ 0], common_pid: nm-applet [ 3022] } hitcount: 2
+ { id: sys_read [ 0], common_pid: whoopsie [ 1212] } hitcount: 2
+ .
+ .
+ .
+ { id: sys_ioctl [ 16], common_pid: bash [ 8479] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: bash [ 3472] } hitcount: 12
+ { id: sys_ioctl [ 16], common_pid: gnome-terminal [ 3199] } hitcount: 16
+ { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 1808
+ { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 5580
+ .
+ .
+ .
+ { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2690] } hitcount: 3
+ { id: sys_waitid [247], common_pid: upstart-dbus-br [ 2688] } hitcount: 16
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 975] } hitcount: 2
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 3204] } hitcount: 4
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 2888] } hitcount: 4
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 3003] } hitcount: 4
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 2873] } hitcount: 4
+ { id: sys_inotify_add_watch [254], common_pid: gmain [ 3196] } hitcount: 6
+ { id: sys_openat [257], common_pid: java [ 2623] } hitcount: 2
+ { id: sys_eventfd2 [290], common_pid: ibus-ui-gtk3 [ 2760] } hitcount: 4
+ { id: sys_eventfd2 [290], common_pid: compiz [ 2994] } hitcount: 6
+
+ Totals:
+ Hits: 31536
+ Entries: 323
+ Dropped: 0
+
+ The above list does give us a breakdown of the ioctl syscall by
+ pid, but it also gives us quite a bit more than that, which we
+ don't really care about at the moment. Since we know the syscall
+ id for sys_ioctl (16, displayed next to the sys_ioctl name), we
+ can use that to filter out all the other syscalls:
+
+ # echo 'hist:key=id.syscall,common_pid.execname:val=hitcount:sort=id,hitcount if id == 16' > \
+ /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
+
+ # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
+ # trigger info: hist:keys=id.syscall,common_pid.execname:vals=hitcount:sort=id.syscall,hitcount:size=2048 if id == 16 [active]
+
+ { id: sys_ioctl [ 16], common_pid: gmain [ 2769] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: evolution-addre [ 8571] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: gmain [ 3003] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: gmain [ 2781] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: gmain [ 2829] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: bash [ 8726] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: bash [ 8508] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: gmain [ 2970] } hitcount: 1
+ { id: sys_ioctl [ 16], common_pid: gmain [ 2768] } hitcount: 1
+ .
+ .
+ .
+ { id: sys_ioctl [ 16], common_pid: pool [ 8559] } hitcount: 45
+ { id: sys_ioctl [ 16], common_pid: pool [ 8555] } hitcount: 48
+ { id: sys_ioctl [ 16], common_pid: pool [ 8551] } hitcount: 48
+ { id: sys_ioctl [ 16], common_pid: avahi-daemon [ 896] } hitcount: 66
+ { id: sys_ioctl [ 16], common_pid: Xorg [ 1267] } hitcount: 26674
+ { id: sys_ioctl [ 16], common_pid: compiz [ 2994] } hitcount: 73443
+
+ Totals:
+ Hits: 101162
+ Entries: 103
+ Dropped: 0
+
+ The above output shows that 'compiz' and 'Xorg' are far and away
+ the heaviest ioctl callers (which might lead to questions about
+ whether they really need to be making all those calls and to
+ possible avenues for further investigation.)
+
+ The compound key examples used a key and a sum value (hitcount) to
+ sort the output, but we can just as easily use two keys instead.
+ Here's an example where we use a compound key composed of the the
+ common_pid and size event fields. Sorting with pid as the primary
+ key and 'size' as the secondary key allows us to display an
+ ordered summary of the recvfrom sizes, with counts, received by
+ each process:
+
+ # echo 'hist:key=common_pid.execname,size:val=hitcount:sort=common_pid,size' > \
+ /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/trigger
+
+ # cat /sys/kernel/debug/tracing/events/syscalls/sys_enter_recvfrom/hist
+ # trigger info: hist:keys=common_pid.execname,size:vals=hitcount:sort=common_pid.execname,size:size=2048 [active]
+
+ { common_pid: smbd [ 784], size: 4 } hitcount: 1
+ { common_pid: dnsmasq [ 1412], size: 4096 } hitcount: 672
+ { common_pid: postgres [ 1796], size: 1000 } hitcount: 6
+ { common_pid: postgres [ 1867], size: 1000 } hitcount: 10
+ { common_pid: bamfdaemon [ 2787], size: 28 } hitcount: 2
+ { common_pid: bamfdaemon [ 2787], size: 14360 } hitcount: 1
+ { common_pid: compiz [ 2994], size: 8 } hitcount: 1
+ { common_pid: compiz [ 2994], size: 20 } hitcount: 11
+ { common_pid: gnome-terminal [ 3199], size: 4 } hitcount: 2
+ { common_pid: firefox [ 8817], size: 4 } hitcount: 1
+ { common_pid: firefox [ 8817], size: 8 } hitcount: 5
+ { common_pid: firefox [ 8817], size: 588 } hitcount: 2
+ { common_pid: firefox [ 8817], size: 628 } hitcount: 1
+ { common_pid: firefox [ 8817], size: 6944 } hitcount: 1
+ { common_pid: firefox [ 8817], size: 408880 } hitcount: 2
+ { common_pid: firefox [ 8822], size: 8 } hitcount: 2
+ { common_pid: firefox [ 8822], size: 160 } hitcount: 2
+ { common_pid: firefox [ 8822], size: 320 } hitcount: 2
+ { common_pid: firefox [ 8822], size: 352 } hitcount: 1
+ .
+ .
+ .
+ { common_pid: pool [ 8923], size: 1960 } hitcount: 10
+ { common_pid: pool [ 8923], size: 2048 } hitcount: 10
+ { common_pid: pool [ 8924], size: 1960 } hitcount: 10
+ { common_pid: pool [ 8924], size: 2048 } hitcount: 10
+ { common_pid: pool [ 8928], size: 1964 } hitcount: 4
+ { common_pid: pool [ 8928], size: 1965 } hitcount: 2
+ { common_pid: pool [ 8928], size: 2048 } hitcount: 6
+ { common_pid: pool [ 8929], size: 1982 } hitcount: 1
+ { common_pid: pool [ 8929], size: 2048 } hitcount: 1
+
+ Totals:
+ Hits: 2016
+ Entries: 224
+ Dropped: 0
+
+ The above example also illustrates the fact that although a compound
+ key is treated as a single entity for hashing purposes, the sub-keys
+ it's composed of can be accessed independently.
+
+ The next example uses a string field as the hash key and
+ demonstrates how you can manually pause and continue a hist trigger.
+ In this example, we'll aggregate fork counts and don't expect a
+ large number of entries in the hash table, so we'll drop it to a
+ much smaller number, say 256:
+
+ # echo 'hist:key=child_comm:val=hitcount:size=256' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist
+ # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active]
+
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: ibus-daemon } hitcount: 1
+ { child_comm: whoopsie } hitcount: 1
+ { child_comm: smbd } hitcount: 1
+ { child_comm: gdbus } hitcount: 1
+ { child_comm: kthreadd } hitcount: 1
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: evolution-alarm } hitcount: 2
+ { child_comm: Socket Thread } hitcount: 2
+ { child_comm: postgres } hitcount: 2
+ { child_comm: bash } hitcount: 3
+ { child_comm: compiz } hitcount: 3
+ { child_comm: evolution-sourc } hitcount: 4
+ { child_comm: dhclient } hitcount: 4
+ { child_comm: pool } hitcount: 5
+ { child_comm: nm-dispatcher.a } hitcount: 8
+ { child_comm: firefox } hitcount: 8
+ { child_comm: dbus-daemon } hitcount: 8
+ { child_comm: glib-pacrunner } hitcount: 10
+ { child_comm: evolution } hitcount: 23
+
+ Totals:
+ Hits: 89
+ Entries: 20
+ Dropped: 0
+
+ If we want to pause the hist trigger, we can simply append :pause to
+ the command that started the trigger. Notice that the trigger info
+ displays as [paused]:
+
+ # echo 'hist:key=child_comm:val=hitcount:size=256:pause' >> \
+ /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist
+ # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [paused]
+
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: kthreadd } hitcount: 1
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: gdbus } hitcount: 1
+ { child_comm: ibus-daemon } hitcount: 1
+ { child_comm: Socket Thread } hitcount: 2
+ { child_comm: evolution-alarm } hitcount: 2
+ { child_comm: smbd } hitcount: 2
+ { child_comm: bash } hitcount: 3
+ { child_comm: whoopsie } hitcount: 3
+ { child_comm: compiz } hitcount: 3
+ { child_comm: evolution-sourc } hitcount: 4
+ { child_comm: pool } hitcount: 5
+ { child_comm: postgres } hitcount: 6
+ { child_comm: firefox } hitcount: 8
+ { child_comm: dhclient } hitcount: 10
+ { child_comm: emacs } hitcount: 12
+ { child_comm: dbus-daemon } hitcount: 20
+ { child_comm: nm-dispatcher.a } hitcount: 20
+ { child_comm: evolution } hitcount: 35
+ { child_comm: glib-pacrunner } hitcount: 59
+
+ Totals:
+ Hits: 199
+ Entries: 21
+ Dropped: 0
+
+ To manually continue having the trigger aggregate events, append
+ :cont instead. Notice that the trigger info displays as [active]
+ again, and the data has changed:
+
+ # echo 'hist:key=child_comm:val=hitcount:size=256:cont' >> \
+ /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist
+ # trigger info: hist:keys=child_comm:vals=hitcount:sort=hitcount:size=256 [active]
+
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: dconf worker } hitcount: 1
+ { child_comm: kthreadd } hitcount: 1
+ { child_comm: gdbus } hitcount: 1
+ { child_comm: ibus-daemon } hitcount: 1
+ { child_comm: Socket Thread } hitcount: 2
+ { child_comm: evolution-alarm } hitcount: 2
+ { child_comm: smbd } hitcount: 2
+ { child_comm: whoopsie } hitcount: 3
+ { child_comm: compiz } hitcount: 3
+ { child_comm: evolution-sourc } hitcount: 4
+ { child_comm: bash } hitcount: 5
+ { child_comm: pool } hitcount: 5
+ { child_comm: postgres } hitcount: 6
+ { child_comm: firefox } hitcount: 8
+ { child_comm: dhclient } hitcount: 11
+ { child_comm: emacs } hitcount: 12
+ { child_comm: dbus-daemon } hitcount: 22
+ { child_comm: nm-dispatcher.a } hitcount: 22
+ { child_comm: evolution } hitcount: 35
+ { child_comm: glib-pacrunner } hitcount: 59
+
+ Totals:
+ Hits: 206
+ Entries: 21
+ Dropped: 0
+
+ The previous example showed how to start and stop a hist trigger by
+ appending 'pause' and 'continue' to the hist trigger command. A
+ hist trigger can also be started in a paused state by initially
+ starting the trigger with ':pause' appended. This allows you to
+ start the trigger only when you're ready to start collecting data
+ and not before. For example, you could start the trigger in a
+ paused state, then unpause it and do something you want to measure,
+ then pause the trigger again when done.
+
+ Of course, doing this manually can be difficult and error-prone, but
+ it is possible to automatically start and stop a hist trigger based
+ on some condition, via the enable_hist and disable_hist triggers.
+
+ For example, suppose we wanted to take a look at the relative
+ weights in terms of skb length for each callpath that leads to a
+ netif_receieve_skb event when downloading a decent-sized file using
+ wget.
+
+ First we set up an initially paused stacktrace trigger on the
+ netif_receive_skb event:
+
+ # echo 'hist:key=stacktrace:vals=len:pause' > \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+
+ Next, we set up an 'enable_hist' trigger on the sched_process_exec
+ event, with an 'if filename==/usr/bin/wget' filter. The effect of
+ this new trigger is that it will 'unpause' the hist trigger we just
+ set up on netif_receive_skb if and only if it sees a
+ sched_process_exec event with a filename of '/usr/bin/wget'. When
+ that happens, all netif_receive_skb events are aggregated into a
+ hash table keyed on stacktrace:
+
+ # echo 'enable_hist:net:netif_receive_skb if filename==/usr/bin/wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger
+
+ The aggregation continues until the netif_receive_skb is paused
+ again, which is what the following disable_hist event does by
+ creating a similar setup on the sched_process_exit event, using the
+ filter 'comm==wget':
+
+ # echo 'disable_hist:net:netif_receive_skb if comm==wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger
+
+ Whenever a process exits and the comm field of the disable_hist
+ trigger filter matches 'comm==wget', the netif_receive_skb hist
+ trigger is disabled.
+
+ The overall effect is that netif_receive_skb events are aggregated
+ into the hash table for only the duration of the wget. Executing a
+ wget command and then listing the 'hist' file will display the
+ output generated by the wget command:
+
+ $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist
+ # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused]
+
+ { stacktrace:
+ __netif_receive_skb_core+0x46d/0x990
+ __netif_receive_skb+0x18/0x60
+ netif_receive_skb_internal+0x23/0x90
+ napi_gro_receive+0xc8/0x100
+ ieee80211_deliver_skb+0xd6/0x270 [mac80211]
+ ieee80211_rx_handlers+0xccf/0x22f0 [mac80211]
+ ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211]
+ ieee80211_rx+0x31d/0x900 [mac80211]
+ iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm]
+ iwl_rx_dispatch+0x8e/0xf0 [iwldvm]
+ iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi]
+ irq_thread_fn+0x20/0x50
+ irq_thread+0x11f/0x150
+ kthread+0xd2/0xf0
+ ret_from_fork+0x42/0x70
+ } hitcount: 85 len: 28884
+ { stacktrace:
+ __netif_receive_skb_core+0x46d/0x990
+ __netif_receive_skb+0x18/0x60
+ netif_receive_skb_internal+0x23/0x90
+ napi_gro_complete+0xa4/0xe0
+ dev_gro_receive+0x23a/0x360
+ napi_gro_receive+0x30/0x100
+ ieee80211_deliver_skb+0xd6/0x270 [mac80211]
+ ieee80211_rx_handlers+0xccf/0x22f0 [mac80211]
+ ieee80211_prepare_and_rx_handle+0x4e7/0xc40 [mac80211]
+ ieee80211_rx+0x31d/0x900 [mac80211]
+ iwlagn_rx_reply_rx+0x3db/0x6f0 [iwldvm]
+ iwl_rx_dispatch+0x8e/0xf0 [iwldvm]
+ iwl_pcie_irq_handler+0xe3c/0x12f0 [iwlwifi]
+ irq_thread_fn+0x20/0x50
+ irq_thread+0x11f/0x150
+ kthread+0xd2/0xf0
+ } hitcount: 98 len: 664329
+ { stacktrace:
+ __netif_receive_skb_core+0x46d/0x990
+ __netif_receive_skb+0x18/0x60
+ process_backlog+0xa8/0x150
+ net_rx_action+0x15d/0x340
+ __do_softirq+0x114/0x2c0
+ do_softirq_own_stack+0x1c/0x30
+ do_softirq+0x65/0x70
+ __local_bh_enable_ip+0xb5/0xc0
+ ip_finish_output+0x1f4/0x840
+ ip_output+0x6b/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x173/0x2a0
+ udp_sendmsg+0x2bf/0x9f0
+ inet_sendmsg+0x64/0xa0
+ sock_sendmsg+0x3d/0x50
+ } hitcount: 115 len: 13030
+ { stacktrace:
+ __netif_receive_skb_core+0x46d/0x990
+ __netif_receive_skb+0x18/0x60
+ netif_receive_skb_internal+0x23/0x90
+ napi_gro_complete+0xa4/0xe0
+ napi_gro_flush+0x6d/0x90
+ iwl_pcie_irq_handler+0x92a/0x12f0 [iwlwifi]
+ irq_thread_fn+0x20/0x50
+ irq_thread+0x11f/0x150
+ kthread+0xd2/0xf0
+ ret_from_fork+0x42/0x70
+ } hitcount: 934 len: 5512212
+
+ Totals:
+ Hits: 1232
+ Entries: 4
+ Dropped: 0
+
+ The above shows all the netif_receive_skb callpaths and their total
+ lengths for the duration of the wget command.
+
+ The 'clear' hist trigger param can be used to clear the hash table.
+ Suppose we wanted to try another run of the previous example but
+ this time also wanted to see the complete list of events that went
+ into the histogram. In order to avoid having to set everything up
+ again, we can just clear the histogram first:
+
+ # echo 'hist:key=stacktrace:vals=len:clear' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+
+ Just to verify that it is in fact cleared, here's what we now see in
+ the hist file:
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist
+ # trigger info: hist:keys=stacktrace:vals=len:sort=hitcount:size=2048 [paused]
+
+ Totals:
+ Hits: 0
+ Entries: 0
+ Dropped: 0
+
+ Since we want to see the detailed list of every netif_receive_skb
+ event occurring during the new run, which are in fact the same
+ events being aggregated into the hash table, we add some additional
+ 'enable_event' events to the triggering sched_process_exec and
+ sched_process_exit events as such:
+
+ # echo 'enable_event:net:netif_receive_skb if filename==/usr/bin/wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger
+
+ # echo 'disable_event:net:netif_receive_skb if comm==wget' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger
+
+ If you read the trigger files for the sched_process_exec and
+ sched_process_exit triggers, you should see two triggers for each:
+ one enabling/disabling the hist aggregation and the other
+ enabling/disabling the logging of events:
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_exec/trigger
+ enable_event:net:netif_receive_skb:unlimited if filename==/usr/bin/wget
+ enable_hist:net:netif_receive_skb:unlimited if filename==/usr/bin/wget
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_exit/trigger
+ enable_event:net:netif_receive_skb:unlimited if comm==wget
+ disable_hist:net:netif_receive_skb:unlimited if comm==wget
+
+ In other words, whenever either of the sched_process_exec or
+ sched_process_exit events is hit and matches 'wget', it enables or
+ disables both the histogram and the event log, and what you end up
+ with is a hash table and set of events just covering the specified
+ duration. Run the wget command again:
+
+ $ wget https://www.kernel.org/pub/linux/kernel/v3.x/patch-3.19.xz
+
+ Displaying the 'hist' file should show something similar to what you
+ saw in the last run, but this time you should also see the
+ individual events in the trace file:
+
+ # cat /sys/kernel/debug/tracing/trace
+
+ # tracer: nop
+ #
+ # entries-in-buffer/entries-written: 183/1426 #P:4
+ #
+ # _-----=> irqs-off
+ # / _----=> need-resched
+ # | / _---=> hardirq/softirq
+ # || / _--=> preempt-depth
+ # ||| / delay
+ # TASK-PID CPU# |||| TIMESTAMP FUNCTION
+ # | | | |||| | |
+ wget-15108 [000] ..s1 31769.606929: netif_receive_skb: dev=lo skbaddr=ffff88009c353100 len=60
+ wget-15108 [000] ..s1 31769.606999: netif_receive_skb: dev=lo skbaddr=ffff88009c353200 len=60
+ dnsmasq-1382 [000] ..s1 31769.677652: netif_receive_skb: dev=lo skbaddr=ffff88009c352b00 len=130
+ dnsmasq-1382 [000] ..s1 31769.685917: netif_receive_skb: dev=lo skbaddr=ffff88009c352200 len=138
+ ##### CPU 2 buffer started ####
+ irq/29-iwlwifi-559 [002] ..s. 31772.031529: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433d00 len=2948
+ irq/29-iwlwifi-559 [002] ..s. 31772.031572: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432200 len=1500
+ irq/29-iwlwifi-559 [002] ..s. 31772.032196: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433100 len=2948
+ irq/29-iwlwifi-559 [002] ..s. 31772.032761: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d433000 len=2948
+ irq/29-iwlwifi-559 [002] ..s. 31772.033220: netif_receive_skb: dev=wlan0 skbaddr=ffff88009d432e00 len=1500
+ .
+ .
+ .
--
1.9.3
Allow users to define any number of hist triggers per trace event.
Any number of hist triggers may be added for a given event, which may
differ by key, value, or filter.
Reading the event's 'hist' file will display the output of all the
hist triggers defined on an event concatenated in the order they were
defined.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
Documentation/trace/events.txt | 154 +++++++++++++++++++++++++++++++++--
kernel/trace/trace.c | 8 +-
kernel/trace/trace_events_hist.c | 172 +++++++++++++++++++++++++++++++--------
3 files changed, 293 insertions(+), 41 deletions(-)
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index db223e8..cc02167 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -550,12 +550,14 @@ The following commands are supported:
'hist' triggers add a 'hist' file to each event's subdirectory.
Reading the 'hist' file for the event will dump the hash table in
- its entirety to stdout. Each printed hash table entry is a simple
- list of the keys and values comprising the entry; keys are printed
- first and are delineated by curly braces, and are followed by the
- set of value fields for the entry. By default, numeric fields are
- displayed as base-10 integers. This can be modified by appending
- any of the following modifiers to the field name:
+ its entirety to stdout. If there are multiple hist triggers
+ attached to an event, there will be a table for each trigger in the
+ output. Each printed hash table entry is a simple list of the keys
+ and values comprising the entry; keys are printed first and are
+ delineated by curly braces, and are followed by the set of value
+ fields for the entry. By default, numeric fields are displayed as
+ base-10 integers. This can be modified by appending any of the
+ following modifiers to the field name:
.hex display a number as a hex value
.sym display an address as a symbol
@@ -1667,3 +1669,143 @@ The following commands are supported:
.
.
.
+
+ The following example demonstrates how multiple hist triggers can be
+ attached to a given event. This capability can be useful for
+ creating a set of different summaries derived from the same set of
+ events, or for comparing the effects of different filters, among
+ other things.
+
+ # echo 'hist:keys=skbaddr.hex:vals=len if len < 0' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:keys=skbaddr.hex:vals=len if len > 4096' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:keys=skbaddr.hex:vals=len if len == 256' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:keys=skbaddr.hex:vals=len' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:keys=len:vals=common_preempt_count' >> \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+
+ The above set of commands create four triggers differing only in
+ their filters, along with a completely different though fairly
+ nonsensical trigger. Note that in order to append multiple hist
+ triggers to the same file, you should use the '>>' operator to
+ append them ('>' will also add the new hist trigger, but will remove
+ any existing hist triggers beforehand).
+
+ Displaying the contents of the 'hist' file for the event shows the
+ contents of all five histograms:
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist
+
+ # event histogram
+ #
+ # trigger info: hist:keys=len:vals=hitcount,common_preempt_count:sort=hitcount:size=2048 [active]
+ #
+
+ { len: 176 } hitcount: 1 common_preempt_count: 0
+ { len: 223 } hitcount: 1 common_preempt_count: 0
+ { len: 4854 } hitcount: 1 common_preempt_count: 0
+ { len: 395 } hitcount: 1 common_preempt_count: 0
+ { len: 177 } hitcount: 1 common_preempt_count: 0
+ { len: 446 } hitcount: 1 common_preempt_count: 0
+ { len: 1601 } hitcount: 1 common_preempt_count: 0
+ .
+ .
+ .
+ { len: 1280 } hitcount: 66 common_preempt_count: 0
+ { len: 116 } hitcount: 81 common_preempt_count: 40
+ { len: 708 } hitcount: 112 common_preempt_count: 0
+ { len: 46 } hitcount: 221 common_preempt_count: 0
+ { len: 1264 } hitcount: 458 common_preempt_count: 0
+
+ Totals:
+ Hits: 1428
+ Entries: 147
+ Dropped: 0
+
+
+ # event histogram
+ #
+ # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active]
+ #
+
+ { skbaddr: ffff8800baee5e00 } hitcount: 1 len: 130
+ { skbaddr: ffff88005f3d5600 } hitcount: 1 len: 1280
+ { skbaddr: ffff88005f3d4900 } hitcount: 1 len: 1280
+ { skbaddr: ffff88009fed6300 } hitcount: 1 len: 115
+ { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 115
+ { skbaddr: ffff88008cdb1900 } hitcount: 1 len: 46
+ { skbaddr: ffff880064b5ef00 } hitcount: 1 len: 118
+ { skbaddr: ffff880044e3c700 } hitcount: 1 len: 60
+ { skbaddr: ffff880100065900 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d46bd500 } hitcount: 1 len: 116
+ { skbaddr: ffff88005f3d5f00 } hitcount: 1 len: 1280
+ { skbaddr: ffff880100064700 } hitcount: 1 len: 365
+ { skbaddr: ffff8800badb6f00 } hitcount: 1 len: 60
+ .
+ .
+ .
+ { skbaddr: ffff88009fe0be00 } hitcount: 27 len: 24677
+ { skbaddr: ffff88009fe0a400 } hitcount: 27 len: 23052
+ { skbaddr: ffff88009fe0b700 } hitcount: 31 len: 25589
+ { skbaddr: ffff88009fe0b600 } hitcount: 32 len: 27326
+ { skbaddr: ffff88006a462800 } hitcount: 68 len: 71678
+ { skbaddr: ffff88006a463700 } hitcount: 70 len: 72678
+ { skbaddr: ffff88006a462b00 } hitcount: 71 len: 77589
+ { skbaddr: ffff88006a463600 } hitcount: 73 len: 71307
+ { skbaddr: ffff88006a462200 } hitcount: 81 len: 81032
+
+ Totals:
+ Hits: 1451
+ Entries: 318
+ Dropped: 0
+
+
+ # event histogram
+ #
+ # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len == 256 [active]
+ #
+
+
+ Totals:
+ Hits: 0
+ Entries: 0
+ Dropped: 0
+
+
+ # event histogram
+ #
+ # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len > 4096 [active]
+ #
+
+ { skbaddr: ffff88009fd2c300 } hitcount: 1 len: 7212
+ { skbaddr: ffff8800d2bcce00 } hitcount: 1 len: 7212
+ { skbaddr: ffff8800d2bcd700 } hitcount: 1 len: 7212
+ { skbaddr: ffff8800d2bcda00 } hitcount: 1 len: 21492
+ { skbaddr: ffff8800ae2e2d00 } hitcount: 1 len: 7212
+ { skbaddr: ffff8800d2bcdb00 } hitcount: 1 len: 7212
+ { skbaddr: ffff88006a4df500 } hitcount: 1 len: 4854
+ { skbaddr: ffff88008ce47b00 } hitcount: 1 len: 18636
+ { skbaddr: ffff8800ae2e2200 } hitcount: 1 len: 12924
+ { skbaddr: ffff88005f3e1000 } hitcount: 1 len: 4356
+ { skbaddr: ffff8800d2bcdc00 } hitcount: 2 len: 24420
+ { skbaddr: ffff8800d2bcc200 } hitcount: 2 len: 12996
+
+ Totals:
+ Hits: 14
+ Entries: 12
+ Dropped: 0
+
+
+ # event histogram
+ #
+ # trigger info: hist:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 if len < 0 [active]
+ #
+
+
+ Totals:
+ Hits: 0
+ Entries: 0
+ Dropped: 0
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 8b9424d..f1ec156 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3847,9 +3847,11 @@ static const char readme_msg[] =
"\t sort field. The 'size' parameter can be used to specify more\n"
"\t or fewer than the default 2048 entries for the hashtable size.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
- "\t table in its entirety to stdout. The default format used to\n"
- "\t display a given field can be modified by appending any of the\n"
- "\t following modifiers to the field name, as applicable:\n\n"
+ "\t table in its entirety to stdout. If there are multiple hist\n"
+ "\t triggers attached to an event, there will be a table for each\n"
+ "\t trigger in the output. The default format used to display a\n"
+ "\t given field can be modified by appending any of the following\n"
+ "\t modifiers to the field name, as applicable:\n\n"
"\t .hex display a number as a hex value\n"
"\t .sym display an address as a symbol\n"
"\t .sym-offset display an address as a symbol and offset\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 49bd1f3..424f5c2 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -1014,33 +1014,18 @@ static int print_entries(struct seq_file *m,
return n_entries;
}
-static int hist_show(struct seq_file *m, void *v)
+static void hist_trigger_show(struct seq_file *m,
+ struct event_trigger_data *data, int n)
{
- struct event_trigger_data *test, *data = NULL;
- struct trace_event_file *event_file;
struct hist_trigger_data *hist_data;
int n_entries, ret = 0;
- mutex_lock(&event_mutex);
-
- event_file = event_file_data(m->private);
- if (unlikely(!event_file)) {
- ret = -ENODEV;
- goto out_unlock;
- }
-
- list_for_each_entry_rcu(test, &event_file->triggers, list) {
- if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- data = test;
- break;
- }
- }
- if (!data)
- goto out_unlock;
+ if (n > 0)
+ seq_puts(m, "\n\n");
seq_puts(m, "# event histogram\n#\n# trigger info: ");
data->ops->print(m, data->ops, data);
- seq_puts(m, "\n");
+ seq_puts(m, "#\n\n");
hist_data = data->private_data;
n_entries = print_entries(m, hist_data);
@@ -1052,6 +1037,27 @@ static int hist_show(struct seq_file *m, void *v)
seq_printf(m, "\nTotals:\n Hits: %llu\n Entries: %u\n Dropped: %llu\n",
(u64)atomic64_read(&hist_data->map->hits),
n_entries, (u64)atomic64_read(&hist_data->map->drops));
+}
+
+static int hist_show(struct seq_file *m, void *v)
+{
+ struct event_trigger_data *data;
+ struct trace_event_file *event_file;
+ int n = 0, ret = 0;
+
+ mutex_lock(&event_mutex);
+
+ event_file = event_file_data(m->private);
+ if (unlikely(!event_file)) {
+ ret = -ENODEV;
+ goto out_unlock;
+ }
+
+ list_for_each_entry_rcu(data, &event_file->triggers, list) {
+ if (data->cmd_ops->trigger_type == ETT_EVENT_HIST)
+ hist_trigger_show(m, data, n++);
+ }
+
out_unlock:
mutex_unlock(&event_mutex);
@@ -1212,6 +1218,54 @@ static void hist_clear(struct event_trigger_data *data)
data->paused = paused;
}
+static bool hist_trigger_match(struct event_trigger_data *data,
+ struct event_trigger_data *data_test)
+{
+ struct tracing_map_sort_key *sort_key, *sort_key_test;
+ struct hist_trigger_data *hist_data, *hist_data_test;
+ struct hist_field *key_field, *key_field_test;
+ unsigned int i;
+
+ hist_data = data->private_data;
+ hist_data_test = data_test->private_data;
+
+ if (hist_data->n_vals != hist_data_test->n_vals ||
+ hist_data->n_fields != hist_data_test->n_fields ||
+ hist_data->n_sort_keys != hist_data_test->n_sort_keys)
+ return false;
+
+ if ((data->filter_str && !data_test->filter_str) ||
+ (!data->filter_str && data_test->filter_str))
+ return false;
+
+ for_each_hist_field(i, hist_data) {
+ key_field = hist_data->fields[i];
+ key_field_test = hist_data_test->fields[i];
+
+ if (key_field->flags != key_field_test->flags)
+ return false;
+ if (key_field->field != key_field_test->field)
+ return false;
+ if (key_field->offset != key_field_test->offset)
+ return false;
+ }
+
+ for (i = 0; i < hist_data->n_sort_keys; i++) {
+ sort_key = &hist_data->sort_keys[i];
+ sort_key_test = &hist_data_test->sort_keys[i];
+
+ if (sort_key->field_idx != sort_key_test->field_idx ||
+ sort_key->descending != sort_key_test->descending)
+ return false;
+ }
+
+ if (data->filter_str &&
+ strcmp(data->filter_str, data_test->filter_str))
+ return false;
+
+ return true;
+}
+
static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file)
@@ -1222,6 +1276,8 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ if (!hist_trigger_match(data, test))
+ continue;
if (hist_data->attrs->pause)
test->paused = true;
else if (hist_data->attrs->cont)
@@ -1261,6 +1317,44 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
return ret;
}
+static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
+ struct event_trigger_data *data,
+ struct trace_event_file *file)
+{
+ struct event_trigger_data *test;
+ bool unregistered = false;
+
+ list_for_each_entry_rcu(test, &file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ if (!hist_trigger_match(data, test))
+ continue;
+ unregistered = true;
+ list_del_rcu(&test->list);
+ trace_event_trigger_enable_disable(file, 0);
+ update_cond_flag(file);
+ break;
+ }
+ }
+
+ if (unregistered && test->ops->free)
+ test->ops->free(test->ops, test);
+}
+
+static void hist_unreg_all(struct trace_event_file *file)
+{
+ struct event_trigger_data *test;
+
+ list_for_each_entry_rcu(test, &file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
+ list_del_rcu(&test->list);
+ trace_event_trigger_enable_disable(file, 0);
+ update_cond_flag(file);
+ if (test->ops->free)
+ test->ops->free(test->ops, test);
+ }
+ }
+}
+
static int event_hist_trigger_func(struct event_command *cmd_ops,
struct trace_event_file *file,
char *glob, char *cmd, char *param)
@@ -1310,22 +1404,19 @@ static int event_hist_trigger_func(struct event_command *cmd_ops,
trigger_data->private_data = hist_data;
+ /* if param is non-empty, it's supposed to be a filter */
+ if (param && cmd_ops->set_filter) {
+ ret = cmd_ops->set_filter(param, trigger_data, file);
+ if (ret < 0)
+ goto out_free;
+ }
+
if (glob[0] == '!') {
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
ret = 0;
goto out_free;
}
- if (!param) /* if param is non-empty, it's supposed to be a filter */
- goto out_reg;
-
- if (!cmd_ops->set_filter)
- goto out_reg;
-
- ret = cmd_ops->set_filter(param, trigger_data, file);
- if (ret < 0)
- goto out_free;
- out_reg:
ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
/*
* The above returns on success the # of triggers registered,
@@ -1358,7 +1449,8 @@ static struct event_command trigger_hist_cmd = {
.needs_rec = true,
.func = event_hist_trigger_func,
.reg = hist_register_trigger,
- .unreg = unregister_trigger,
+ .unreg = hist_unregister_trigger,
+ .unreg_all = hist_unreg_all,
.get_trigger_ops = event_hist_get_trigger_ops,
.set_filter = set_trigger_filter,
};
@@ -1385,7 +1477,6 @@ hist_enable_trigger(struct event_trigger_data *data, void *rec)
test->paused = false;
else
test->paused = true;
- break;
}
}
}
@@ -1448,12 +1539,28 @@ hist_enable_get_trigger_ops(char *cmd, char *param)
return ops;
}
+static void hist_enable_unreg_all(struct trace_event_file *file)
+{
+ struct event_trigger_data *test;
+
+ list_for_each_entry_rcu(test, &file->triggers, list) {
+ if (test->cmd_ops->trigger_type == ETT_HIST_ENABLE) {
+ list_del_rcu(&test->list);
+ update_cond_flag(file);
+ trace_event_trigger_enable_disable(file, 0);
+ if (test->ops->free)
+ test->ops->free(test->ops, test);
+ }
+ }
+}
+
static struct event_command trigger_hist_enable_cmd = {
.name = ENABLE_HIST_STR,
.trigger_type = ETT_HIST_ENABLE,
.func = event_enable_trigger_func,
.reg = event_enable_register_trigger,
.unreg = event_enable_unregister_trigger,
+ .unreg_all = hist_enable_unreg_all,
.get_trigger_ops = hist_enable_get_trigger_ops,
.set_filter = set_trigger_filter,
};
@@ -1464,6 +1571,7 @@ static struct event_command trigger_hist_disable_cmd = {
.func = event_enable_trigger_func,
.reg = event_enable_register_trigger,
.unreg = event_enable_unregister_trigger,
+ .unreg_all = hist_enable_unreg_all,
.get_trigger_ops = hist_enable_get_trigger_ops,
.set_filter = set_trigger_filter,
};
--
1.9.3
Named triggers are sets of triggers that share a common set of trigger
data. An example of functionality that could benefit from this type
of capability would be a set of inlined probes that would each
contribute event counts, for example, to a shared counter data
structure.
The first named trigger registered with a given name owns the common
trigger data that the others subsequently registered with the same
name will reference. The functions defined here allow users to add,
delete, and find named triggers.
It also adds functions to pause and unpause named triggers; since
named triggers act upon common data, they should also be paused and
unpaused as a group.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
kernel/trace/trace.h | 13 ++++
kernel/trace/trace_events_trigger.c | 143 ++++++++++++++++++++++++++++++++++++
2 files changed, 156 insertions(+)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h
index 7126dd7..fed2ae0 100644
--- a/kernel/trace/trace.h
+++ b/kernel/trace/trace.h
@@ -1183,7 +1183,11 @@ struct event_trigger_data {
char *filter_str;
void *private_data;
bool paused;
+ bool paused_tmp;
struct list_head list;
+ char *name;
+ struct list_head named_list;
+ struct event_trigger_data *named_data;
};
/* Avoid typos */
@@ -1226,6 +1230,15 @@ extern void unregister_trigger(char *glob, struct event_trigger_ops *ops,
extern int set_trigger_filter(char *filter_str,
struct event_trigger_data *trigger_data,
struct trace_event_file *file);
+extern struct event_trigger_data *find_named_trigger(const char *name);
+extern bool is_named_trigger(struct event_trigger_data *test);
+extern int save_named_trigger(const char *name,
+ struct event_trigger_data *data);
+extern void del_named_trigger(struct event_trigger_data *data);
+extern void pause_named_trigger(struct event_trigger_data *data);
+extern void unpause_named_trigger(struct event_trigger_data *data);
+extern void set_named_trigger_data(struct event_trigger_data *data,
+ struct event_trigger_data *named_data);
extern int register_event_command(struct event_command *cmd);
extern int unregister_event_command(struct event_command *cmd);
extern int register_trigger_hist_enable_disable_cmds(void);
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 2d057f2..c06593e 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -646,6 +646,7 @@ event_trigger_callback(struct event_command *cmd_ops,
trigger_data->ops = trigger_ops;
trigger_data->cmd_ops = cmd_ops;
INIT_LIST_HEAD(&trigger_data->list);
+ INIT_LIST_HEAD(&trigger_data->named_list);
if (glob[0] == '!') {
cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
@@ -769,6 +770,148 @@ int set_trigger_filter(char *filter_str,
return ret;
}
+static LIST_HEAD(named_triggers);
+
+/**
+ * find_named_trigger - Find the common named trigger associated with @name
+ * @name: The name of the set of named triggers to find the common data for
+ *
+ * Named triggers are sets of triggers that share a common set of
+ * trigger data. The first named trigger registered with a given name
+ * owns the common trigger data that the others subsequently
+ * registered with the same name will reference. This function
+ * returns the common trigger data associated with that first
+ * registered instance.
+ *
+ * Return: the common trigger data for the given named trigger on
+ * success, NULL otherwise.
+ */
+struct event_trigger_data *find_named_trigger(const char *name)
+{
+ struct event_trigger_data *data;
+
+ if (!name)
+ return NULL;
+
+ list_for_each_entry(data, &named_triggers, named_list) {
+ if (data->named_data)
+ continue;
+ if (!strcmp(data->name, name))
+ return data;
+ }
+
+ return NULL;
+}
+
+/**
+ * is_named_trigger - determine if a given trigger is a named trigger
+ * @test: The trigger data to test
+ *
+ * Return: true if 'test' is a named trigger, false otherwise.
+ */
+bool is_named_trigger(struct event_trigger_data *test)
+{
+ struct event_trigger_data *data;
+
+ list_for_each_entry(data, &named_triggers, named_list) {
+ if (test == data)
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * save_named_trigger - save the trigger in the named trigger list
+ * @name: The name of the named trigger set
+ * @data: The trigger data to save
+ *
+ * Return: 0 if successful, negative error otherwise.
+ */
+int save_named_trigger(const char *name, struct event_trigger_data *data)
+{
+ data->name = kstrdup(name, GFP_KERNEL);
+ if (!data->name)
+ return -ENOMEM;
+
+ list_add(&data->named_list, &named_triggers);
+
+ return 0;
+}
+
+/**
+ * del_named_trigger - delete a trigger from the named trigger list
+ * @data: The trigger data to delete
+ */
+void del_named_trigger(struct event_trigger_data *data)
+{
+ kfree(data->name);
+ data->name = NULL;
+
+ list_del(&data->named_list);
+}
+
+static void __pause_named_trigger(struct event_trigger_data *data, bool pause)
+{
+ struct event_trigger_data *test;
+
+ list_for_each_entry(test, &named_triggers, named_list) {
+ if (!strcmp(test->name, data->name)) {
+ if (pause) {
+ test->paused_tmp = test->paused;
+ test->paused = true;
+ } else {
+ test->paused = test->paused_tmp;
+ }
+ }
+ }
+}
+
+/**
+ * pause_named_trigger - Pause all named triggers with the same name
+ * @data: The trigger data of a named trigger to pause
+ *
+ * Pauses a named trigger along with all other triggers having the
+ * same name. Because named triggers share a common set of data,
+ * pausing only one is meaningless, so pausing one named trigger needs
+ * to pause all triggers with the same name.
+ */
+void pause_named_trigger(struct event_trigger_data *data)
+{
+ __pause_named_trigger(data, true);
+}
+
+/**
+ * unpause_named_trigger - Un-pause all named triggers with the same name
+ * @data: The trigger data of a named trigger to unpause
+ *
+ * Un-pauses a named trigger along with all other triggers having the
+ * same name. Because named triggers share a common set of data,
+ * unpausing only one is meaningless, so unpausing one named trigger
+ * needs to unpause all triggers with the same name.
+ */
+void unpause_named_trigger(struct event_trigger_data *data)
+{
+ __pause_named_trigger(data, false);
+}
+
+/**
+ * set_named_trigger_data - Associate common named trigger data
+ * @data: The trigger data of a named trigger to unpause
+ *
+ * Named triggers are sets of triggers that share a common set of
+ * trigger data. The first named trigger registered with a given name
+ * owns the common trigger data that the others subsequently
+ * registered with the same name will reference. This function
+ * associates the common trigger data from the first trigger with the
+ * given trigger.
+ */
+void set_named_trigger_data(struct event_trigger_data *data,
+ struct event_trigger_data *named_data)
+{
+ data->named_data = named_data;
+}
+
static void
traceon_trigger(struct event_trigger_data *data, void *rec)
{
--
1.9.3
Allow users to define 'named' hist triggers. All triggers created
with the same 'name=xxx' option will update the same shared histogram
data.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx ... [ if filter] > event/trigger
to this:
# echo hist:name=xxx:keys=xxx ... [ if filter] > event/trigger
Named histograms must use a 'compatible' set of keys and values, which
means each event added to a set of named triggers must have the same
names and types.
Reading the 'hist' file of any of the participating events will
produce the same output as any other participating event, which is to
be expected since they share the same data.
Signed-off-by: Tom Zanussi <[email protected]>
Tested-by: Masami Hiramatsu <[email protected]>
---
Documentation/trace/events.txt | 274 +++++++++++++++++++++++++++++++++++++--
kernel/trace/trace.c | 14 +-
kernel/trace/trace_events_hist.c | 148 ++++++++++++++++++---
3 files changed, 407 insertions(+), 29 deletions(-)
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index cc02167..08d74d7 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -524,7 +524,7 @@ The following commands are supported:
hist:keys=<field1[,field2,...]>[:values=<field1[,field2,...]>]
[:sort=<field1[,field2,...]>][:size=#entries][:pause][:continue]
- [:clear] [if <filter>]
+ [:clear][:name=histname1] [if <filter>]
When a matching event is hit, an entry is added to a hash table
using the key(s) and value(s) named. Keys and values correspond to
@@ -546,18 +546,28 @@ The following commands are supported:
specified by the 'sort' keyword. If more than one field is
specified, the result will be a 'sort within a sort': the first key
is taken to be the primary sort key and the second the secondary
- key.
+ key. If a hist trigger is given a name using the 'name' parameter,
+ its histogram data will be shared with other triggers of the same
+ name, and trigger hits will update this common data. Only triggers
+ with 'compatible' fields can be combined in this way; triggers are
+ 'compatible' if the fields named in the trigger share the same
+ number and type of fields and those fields also have the same names.
+ Note that any two events always share the compatible 'hitcount' and
+ 'stacktrace' fields and can therefore be combined using those
+ fields, however pointless that may be.
'hist' triggers add a 'hist' file to each event's subdirectory.
Reading the 'hist' file for the event will dump the hash table in
its entirety to stdout. If there are multiple hist triggers
attached to an event, there will be a table for each trigger in the
- output. Each printed hash table entry is a simple list of the keys
- and values comprising the entry; keys are printed first and are
- delineated by curly braces, and are followed by the set of value
- fields for the entry. By default, numeric fields are displayed as
- base-10 integers. This can be modified by appending any of the
- following modifiers to the field name:
+ output. The table displayed for a named trigger will be the same as
+ any other instance having the same name. Each printed hash table
+ entry is a simple list of the keys and values comprising the entry;
+ keys are printed first and are delineated by curly braces, and are
+ followed by the set of value fields for the entry. By default,
+ numeric fields are displayed as base-10 integers. This can be
+ modified by appending any of the following modifiers to the field
+ name:
.hex display a number as a hex value
.sym display an address as a symbol
@@ -1809,3 +1819,251 @@ The following commands are supported:
Hits: 0
Entries: 0
Dropped: 0
+
+ Named triggers can be used to have triggers share a common set of
+ histogram data. This capability is mostly useful for combining the
+ output of events generated by tracepoints contained inside inline
+ functions, but names can be used in a hist trigger on any event.
+ For example, these two triggers when hit will update the same 'len'
+ field in the shared 'foo' histogram data:
+
+ # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ You can see that they're updating common histogram data by reading
+ each event's hist files at the same time:
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist;
+ cat /sys/kernel/debug/tracing/events/net/netif_rx/hist
+
+ # event histogram
+ #
+ # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active]
+ #
+
+ { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46
+ { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76
+ { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468
+ { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46
+ { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52
+ { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168
+ { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260
+ { skbaddr: ffff880064505000 } hitcount: 1 len: 46
+ { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32
+ { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44
+ { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168
+ { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40
+ { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40
+ { skbaddr: ffff880064505f00 } hitcount: 1 len: 174
+ { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160
+ { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76
+ { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32
+ { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988
+ { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46
+ { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44
+ { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676
+ { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107
+ { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92
+ { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142
+ { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220
+ { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92
+ { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92
+ { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675
+ { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138
+ { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138
+ { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184
+ { skbaddr: ffff880064504400 } hitcount: 4 len: 184
+ { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184
+ { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230
+ { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196
+ { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276
+ { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276
+
+ Totals:
+ Hits: 81
+ Entries: 42
+ Dropped: 0
+ # event histogram
+ #
+ # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active]
+ #
+
+ { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46
+ { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76
+ { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468
+ { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46
+ { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52
+ { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168
+ { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260
+ { skbaddr: ffff880064505000 } hitcount: 1 len: 46
+ { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32
+ { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44
+ { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168
+ { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40
+ { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40
+ { skbaddr: ffff880064505f00 } hitcount: 1 len: 174
+ { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160
+ { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76
+ { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32
+ { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988
+ { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46
+ { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44
+ { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676
+ { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107
+ { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92
+ { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142
+ { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220
+ { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92
+ { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92
+ { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675
+ { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138
+ { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138
+ { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184
+ { skbaddr: ffff880064504400 } hitcount: 4 len: 184
+ { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184
+ { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230
+ { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196
+ { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276
+ { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276
+
+ Totals:
+ Hits: 81
+ Entries: 42
+ Dropped: 0
+
+ And here's an example that shows how to combine histogram data from
+ any two events even if they don't share any 'compatible' fields
+ other than 'hitcount' and 'stacktrace'. These commands create a
+ couple of triggers named 'bar' using those fields:
+
+ # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger
+ # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ And displaying the output of either shows some interesting if
+ somewhat confusing output:
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist
+ # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist
+
+ # event histogram
+ #
+ # trigger info: hist:name=bar:keys=stacktrace:vals=hitcount:sort=hitcount:size=2048 [active]
+ #
+
+ { stacktrace:
+ _do_fork+0x18e/0x330
+ kernel_thread+0x29/0x30
+ kthreadd+0x154/0x1b0
+ ret_from_fork+0x3f/0x70
+ } hitcount: 1
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx_ni+0x20/0x70
+ dev_loopback_xmit+0xaa/0xd0
+ ip_mc_output+0x126/0x240
+ ip_local_out_sk+0x31/0x40
+ igmp_send_report+0x1e9/0x230
+ igmp_timer_expire+0xe9/0x120
+ call_timer_fn+0x39/0xf0
+ run_timer_softirq+0x1e1/0x290
+ __do_softirq+0xfd/0x290
+ irq_exit+0x98/0xb0
+ smp_apic_timer_interrupt+0x4a/0x60
+ apic_timer_interrupt+0x6d/0x80
+ cpuidle_enter+0x17/0x20
+ call_cpuidle+0x3b/0x60
+ cpu_startup_entry+0x22d/0x310
+ } hitcount: 1
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx_ni+0x20/0x70
+ dev_loopback_xmit+0xaa/0xd0
+ ip_mc_output+0x17f/0x240
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x13e/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ SYSC_sendto+0xef/0x170
+ SyS_sendto+0xe/0x10
+ entry_SYSCALL_64_fastpath+0x12/0x6a
+ } hitcount: 2
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ ___sys_sendmsg+0x14e/0x270
+ } hitcount: 76
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ ___sys_sendmsg+0x269/0x270
+ } hitcount: 77
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ SYSC_sendto+0xef/0x170
+ } hitcount: 88
+ { stacktrace:
+ _do_fork+0x18e/0x330
+ SyS_clone+0x19/0x20
+ entry_SYSCALL_64_fastpath+0x12/0x6a
+ } hitcount: 244
+
+ Totals:
+ Hits: 489
+ Entries: 7
+ Dropped: 0
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f1ec156..75b612c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3833,6 +3833,7 @@ static const char readme_msg[] =
"\t [:sort=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
"\t [:pause][:continue][:clear]\n"
+ "\t [:name=histname1]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
"\t table using the key(s) and value(s) named, and the value of a\n"
@@ -3845,13 +3846,18 @@ static const char readme_msg[] =
"\t specified using the 'sort' keyword. The sort direction can\n"
"\t be modified by appending '.descending' or '.ascending' to a\n"
"\t sort field. The 'size' parameter can be used to specify more\n"
- "\t or fewer than the default 2048 entries for the hashtable size.\n\n"
+ "\t or fewer than the default 2048 entries for the hashtable size.\n"
+ "\t If a hist trigger is given a name using the 'name' parameter,\n"
+ "\t its histogram data will be shared with other triggers of the\n"
+ "\t same name, and trigger hits will update this common data.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
"\t table in its entirety to stdout. If there are multiple hist\n"
"\t triggers attached to an event, there will be a table for each\n"
- "\t trigger in the output. The default format used to display a\n"
- "\t given field can be modified by appending any of the following\n"
- "\t modifiers to the field name, as applicable:\n\n"
+ "\t trigger in the output. The table displayed for a named\n"
+ "\t trigger will be the same as any other instance having the\n"
+ "\t same name. The default format used to display a given field\n"
+ "\t can be modified by appending any of the following modifiers\n"
+ "\t to the field name, as applicable:\n\n"
"\t .hex display a number as a hex value\n"
"\t .sym display an address as a symbol\n"
"\t .sym-offset display an address as a symbol and offset\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 424f5c2..1338da2 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -118,6 +118,7 @@ struct hist_trigger_attrs {
char *keys_str;
char *vals_str;
char *sort_key_str;
+ char *name;
bool pause;
bool cont;
bool clear;
@@ -201,6 +202,7 @@ static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
if (!attrs)
return;
+ kfree(attrs->name);
kfree(attrs->sort_key_str);
kfree(attrs->keys_str);
kfree(attrs->vals_str);
@@ -228,6 +230,8 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
attrs->vals_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "sort", strlen("sort")))
attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "name", strlen("name")))
+ attrs->name = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "pause", strlen("pause")))
attrs->pause = true;
else if (!strncmp(str, "clear", strlen("clear")))
@@ -1113,7 +1117,12 @@ static int event_hist_trigger_print(struct seq_file *m,
struct hist_field *key_field;
unsigned int i;
- seq_puts(m, "hist:keys=");
+ seq_puts(m, "hist:");
+
+ if (data->name)
+ seq_printf(m, "%s:", data->name);
+
+ seq_puts(m, "keys=");
for_each_hist_key_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -1175,6 +1184,19 @@ static int event_hist_trigger_print(struct seq_file *m,
return 0;
}
+static int event_hist_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+
+ if (!data->ref && hist_data->attrs->name)
+ save_named_trigger(hist_data->attrs->name, data);
+
+ data->ref++;
+
+ return 0;
+}
+
static void event_hist_trigger_free(struct event_trigger_ops *ops,
struct event_trigger_data *data)
{
@@ -1185,6 +1207,8 @@ static void event_hist_trigger_free(struct event_trigger_ops *ops,
data->ref--;
if (!data->ref) {
+ if (data->name)
+ del_named_trigger(data);
trigger_data_free(data);
destroy_hist_data(hist_data);
}
@@ -1193,10 +1217,44 @@ static void event_hist_trigger_free(struct event_trigger_ops *ops,
static struct event_trigger_ops event_hist_trigger_ops = {
.func = event_hist_trigger,
.print = event_hist_trigger_print,
- .init = event_trigger_init,
+ .init = event_hist_trigger_init,
.free = event_hist_trigger_free,
};
+static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ data->ref++;
+
+ save_named_trigger(data->named_data->name, data);
+
+ event_hist_trigger_init(ops, data->named_data);
+
+ return 0;
+}
+
+static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ if (WARN_ON_ONCE(data->ref <= 0))
+ return;
+
+ event_hist_trigger_free(ops, data->named_data);
+
+ data->ref--;
+ if (!data->ref) {
+ del_named_trigger(data);
+ trigger_data_free(data);
+ }
+}
+
+static struct event_trigger_ops event_hist_trigger_named_ops = {
+ .func = event_hist_trigger,
+ .print = event_hist_trigger_print,
+ .init = event_hist_trigger_named_init,
+ .free = event_hist_trigger_named_free,
+};
+
static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
char *param)
{
@@ -1206,26 +1264,54 @@ static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
static void hist_clear(struct event_trigger_data *data)
{
struct hist_trigger_data *hist_data = data->private_data;
- bool paused;
- paused = data->paused;
- data->paused = true;
+ if (data->name)
+ pause_named_trigger(data);
synchronize_sched();
tracing_map_clear(hist_data->map);
- data->paused = paused;
+ if (data->name)
+ unpause_named_trigger(data);
+}
+
+static bool compatible_field(struct ftrace_event_field *field,
+ struct ftrace_event_field *test_field)
+{
+ if (field == test_field)
+ return true;
+ if (field == NULL || test_field == NULL)
+ return false;
+ if (strcmp(field->name, test_field->name))
+ return false;
+ if (strcmp(field->type, test_field->type))
+ return false;
+ if (field->size != test_field->size)
+ return false;
+ if (field->is_signed != test_field->is_signed)
+ return false;
+
+ return true;
}
static bool hist_trigger_match(struct event_trigger_data *data,
- struct event_trigger_data *data_test)
+ struct event_trigger_data *data_test,
+ struct event_trigger_data *named_data,
+ bool ignore_filter)
{
struct tracing_map_sort_key *sort_key, *sort_key_test;
struct hist_trigger_data *hist_data, *hist_data_test;
struct hist_field *key_field, *key_field_test;
unsigned int i;
+ if (named_data && (named_data != data_test) &&
+ (named_data != data_test->named_data))
+ return false;
+
+ if (!named_data && is_named_trigger(data_test))
+ return false;
+
hist_data = data->private_data;
hist_data_test = data_test->private_data;
@@ -1234,9 +1320,11 @@ static bool hist_trigger_match(struct event_trigger_data *data,
hist_data->n_sort_keys != hist_data_test->n_sort_keys)
return false;
- if ((data->filter_str && !data_test->filter_str) ||
- (!data->filter_str && data_test->filter_str))
- return false;
+ if (!ignore_filter) {
+ if ((data->filter_str && !data_test->filter_str) ||
+ (!data->filter_str && data_test->filter_str))
+ return false;
+ }
for_each_hist_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -1244,7 +1332,7 @@ static bool hist_trigger_match(struct event_trigger_data *data,
if (key_field->flags != key_field_test->flags)
return false;
- if (key_field->field != key_field_test->field)
+ if (!compatible_field(key_field->field, key_field_test->field))
return false;
if (key_field->offset != key_field_test->offset)
return false;
@@ -1259,7 +1347,7 @@ static bool hist_trigger_match(struct event_trigger_data *data,
return false;
}
- if (data->filter_str &&
+ if (!ignore_filter && data->filter_str &&
strcmp(data->filter_str, data_test->filter_str))
return false;
@@ -1271,12 +1359,26 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
struct trace_event_file *file)
{
struct hist_trigger_data *hist_data = data->private_data;
- struct event_trigger_data *test;
+ struct event_trigger_data *test, *named_data = NULL;
int ret = 0;
+ if (hist_data->attrs->name) {
+ named_data = find_named_trigger(hist_data->attrs->name);
+ if (named_data) {
+ if (!hist_trigger_match(data, named_data, named_data,
+ true)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ }
+
+ if (hist_data->attrs->name && !named_data)
+ goto new;
+
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (!hist_trigger_match(data, test))
+ if (!hist_trigger_match(data, test, named_data, false))
continue;
if (hist_data->attrs->pause)
test->paused = true;
@@ -1289,12 +1391,19 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
goto out;
}
}
-
+ new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
ret = -ENOENT;
goto out;
}
+ if (named_data) {
+ destroy_hist_data(data->private_data);
+ data->private_data = named_data->private_data;
+ set_named_trigger_data(data, named_data);
+ data->ops = &event_hist_trigger_named_ops;
+ }
+
if (hist_data->attrs->pause)
data->paused = true;
@@ -1308,6 +1417,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
ret++;
update_cond_flag(file);
+
if (trace_event_trigger_enable_disable(file, 1) < 0) {
list_del_rcu(&data->list);
update_cond_flag(file);
@@ -1321,12 +1431,16 @@ static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file)
{
- struct event_trigger_data *test;
+ struct hist_trigger_data *hist_data = data->private_data;
+ struct event_trigger_data *test, *named_data = NULL;
bool unregistered = false;
+ if (hist_data->attrs->name)
+ named_data = find_named_trigger(hist_data->attrs->name);
+
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (!hist_trigger_match(data, test))
+ if (!hist_trigger_match(data, test, named_data, false))
continue;
unregistered = true;
list_del_rcu(&test->list);
--
1.9.3
From: Masami Hiramatsu <[email protected]>
This adds simple event trigger testcases for ftracetest,
which covers following triggers.
- traceon-traceoff trigger
- enable/disable_event trigger
- snapshot trigger
- stacktrace trigger
- trigger filters
Here is the test result.
----
# ./ftracetest test.d/trigger/
=== Ftrace unit tests ===
[1] event trigger - test event enable/disable trigger [PASS]
[2] event trigger - test trigger filter [PASS]
[3] event trigger - test snapshot-trigger [PASS]
[4] event trigger - test stacktrace-trigger [PASS]
[5] event trigger - test traceon/off trigger [PASS]
# of passed: 5
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
----
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Tom Zanussi <[email protected]>
---
tools/testing/selftests/ftrace/test.d/functions | 9 +++
.../ftrace/test.d/trigger/trigger-eventonoff.tc | 64 ++++++++++++++++++++++
.../ftrace/test.d/trigger/trigger-filter.tc | 59 ++++++++++++++++++++
.../ftrace/test.d/trigger/trigger-snapshot.tc | 56 +++++++++++++++++++
.../ftrace/test.d/trigger/trigger-stacktrace.tc | 53 ++++++++++++++++++
.../ftrace/test.d/trigger/trigger-traceonoff.tc | 58 ++++++++++++++++++++
6 files changed, 299 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
diff --git a/tools/testing/selftests/ftrace/test.d/functions b/tools/testing/selftests/ftrace/test.d/functions
index 5d8cd06..c37262f 100644
--- a/tools/testing/selftests/ftrace/test.d/functions
+++ b/tools/testing/selftests/ftrace/test.d/functions
@@ -14,3 +14,12 @@ enable_tracing() { # start trace recording
reset_tracer() { # reset the current tracer
echo nop > current_tracer
}
+
+reset_trigger() { # reset all current setting triggers
+ grep -v ^# events/*/*/trigger |
+ while read line; do
+ cmd=`echo $line | cut -f2- -d: | cut -f1 -d" "`
+ echo "!$cmd" > `echo $line | cut -f1 -d:`
+ done
+}
+
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
new file mode 100644
index 0000000..1a94450
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
@@ -0,0 +1,64 @@
+#!/bin/sh
+# description: event trigger - test event enable/disable trigger
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep enable_event events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "event enable/disable trigger is not supported"
+ exit_unsupported
+fi
+
+echo "Test enable_event trigger"
+echo 0 > events/sched/sched_switch/enable
+echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger
+( echo "forked")
+if [ `cat events/sched/sched_switch/enable` != '1*' ]; then
+ fail "enable_event trigger on sched_process_fork did not work"
+fi
+
+reset_trigger
+
+echo "Test disable_event trigger"
+echo 1 > events/sched/sched_switch/enable
+echo 'disable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger
+( echo "forked")
+if [ `cat events/sched/sched_switch/enable` != '0*' ]; then
+ fail "disable_event trigger on sched_process_fork did not work"
+fi
+
+reset_trigger
+
+echo "Test semantic error for event enable/disable trigger"
+! echo 'enable_event:nogroup:noevent' > events/sched/sched_process_fork/trigger
+! echo 'disable_event+1' > events/sched/sched_process_fork/trigger
+echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger
+! echo 'enable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger
+! echo 'disable_event:sched:sched_switch' > events/sched/sched_process_fork/trigger
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
new file mode 100644
index 0000000..514e466
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
@@ -0,0 +1,59 @@
+#!/bin/sh
+# description: event trigger - test trigger filter
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+echo "Test trigger filter"
+echo 1 > tracing_on
+echo 'traceoff if child_pid == 0' > events/sched/sched_process_fork/trigger
+( echo "forked")
+if [ `cat tracing_on` -ne 1 ]; then
+ fail "traceoff trigger on sched_process_fork did not work"
+fi
+
+reset_trigger
+
+echo "Test semantic error for trigger filter"
+! echo 'traceoff if a' > events/sched/sched_process_fork/trigger
+! echo 'traceoff if common_pid=0' > events/sched/sched_process_fork/trigger
+! echo 'traceoff if common_pid==b' > events/sched/sched_process_fork/trigger
+echo 'traceoff if common_pid == 0' > events/sched/sched_process_fork/trigger
+echo '!traceoff' > events/sched/sched_process_fork/trigger
+! echo 'traceoff if common_pid == child_pid' > events/sched/sched_process_fork/trigger
+echo 'traceoff if common_pid <= 0' > events/sched/sched_process_fork/trigger
+echo '!traceoff' > events/sched/sched_process_fork/trigger
+echo 'traceoff if common_pid >= 0' > events/sched/sched_process_fork/trigger
+echo '!traceoff' > events/sched/sched_process_fork/trigger
+echo 'traceoff if parent_pid >= 0 && child_pid >= 0' > events/sched/sched_process_fork/trigger
+echo '!traceoff' > events/sched/sched_process_fork/trigger
+echo 'traceoff if parent_pid >= 0 || child_pid >= 0' > events/sched/sched_process_fork/trigger
+echo '!traceoff' > events/sched/sched_process_fork/trigger
+
+
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
new file mode 100644
index 0000000..f84b80d
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
@@ -0,0 +1,56 @@
+#!/bin/sh
+# description: event trigger - test snapshot-trigger
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep snapshot events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "snapshot trigger is not supported"
+ exit_unsupported
+fi
+
+echo "Test snapshot tigger"
+echo 0 > snapshot
+echo 1 > events/sched/sched_process_fork/enable
+( echo "forked")
+echo 'snapshot:1' > events/sched/sched_process_fork/trigger
+( echo "forked")
+grep sched_process_fork snapshot > /dev/null || \
+ fail "snapshot trigger on sched_process_fork did not work"
+
+reset_trigger
+echo 0 > snapshot
+echo 0 > events/sched/sched_process_fork/enable
+
+echo "Test snapshot semantic errors"
+
+! echo "snapshot+1" > events/sched/sched_process_fork/trigger
+echo "snapshot" > events/sched/sched_process_fork/trigger
+! echo "snapshot" > events/sched/sched_process_fork/trigger
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
new file mode 100644
index 0000000..9fa23b0
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
@@ -0,0 +1,53 @@
+#!/bin/sh
+# description: event trigger - test stacktrace-trigger
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep stacktrace events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "stacktrace trigger is not supported"
+ exit_unsupported
+fi
+
+echo "Test stacktrace tigger"
+echo 0 > trace
+echo 0 > options/stacktrace
+echo 'stacktrace' > events/sched/sched_process_fork/trigger
+( echo "forked")
+grep "<stack trace>" trace > /dev/null || \
+ fail "stacktrace trigger on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test stacktrace semantic errors"
+
+! echo "stacktrace:foo" > events/sched/sched_process_fork/trigger
+echo "stacktrace" > events/sched/sched_process_fork/trigger
+! echo "stacktrace" > events/sched/sched_process_fork/trigger
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
new file mode 100644
index 0000000..87648e5
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
@@ -0,0 +1,58 @@
+#!/bin/sh
+# description: event trigger - test traceon/off trigger
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+echo "Test traceoff trigger"
+echo 1 > tracing_on
+echo 'traceoff' > events/sched/sched_process_fork/trigger
+( echo "forked")
+if [ `cat tracing_on` -ne 0 ]; then
+ fail "traceoff trigger on sched_process_fork did not work"
+fi
+
+reset_trigger
+
+echo "Test traceon trigger"
+echo 0 > tracing_on
+echo 'traceon' > events/sched/sched_process_fork/trigger
+( echo "forked")
+if [ `cat tracing_on` -ne 1 ]; then
+ fail "traceoff trigger on sched_process_fork did not work"
+fi
+
+reset_trigger
+
+echo "Test semantic error for traceoff/on trigger"
+! echo 'traceoff:badparam' > events/sched/sched_process_fork/trigger
+! echo 'traceoff+0' > events/sched/sched_process_fork/trigger
+echo 'traceon' > events/sched/sched_process_fork/trigger
+! echo 'traceon' > events/sched/sched_process_fork/trigger
+! echo 'traceoff' > events/sched/sched_process_fork/trigger
+
+do_reset
+
+exit 0
--
1.9.3
From: Masami Hiramatsu <[email protected]>
Add the hist trigger testcases for ftracetest.
This checks the basic histogram trigger behaviors like as;
- Histogram trigger itself
- Histogram with string key
- Histogram with compound keys
- Histogram with sort key
- Histogram trigger modifiers (execname, hex, syscall)
- Multiple histograms on an event
- Named histogram
- Named histogram on multi events
Here is the test result.
----
# ./ftracetest test.d/trigger/*hist*.tc
=== Ftrace unit tests ===
[1] event trigger - test histogram modifiers [PASS]
[2] event trigger - test histogram trigger [PASS]
[3] event trigger - test multiple histogram triggers [PASS]
# of passed: 3
# of failed: 0
# of unresolved: 0
# of untested: 0
# of unsupported: 0
# of xfailed: 0
# of undefined(test bug): 0
----
Signed-off-by: Masami Hiramatsu <[email protected]>
Cc: Steven Rostedt <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Tom Zanussi <[email protected]>
Signed-off-by: Tom Zanussi <[email protected]>
[Tom Zanussi: Change multihist test from truncate ('>') to append ('>>')]
---
.../ftrace/test.d/trigger/trigger-hist-mod.tc | 65 +++++++++++++++++
.../ftrace/test.d/trigger/trigger-hist.tc | 83 ++++++++++++++++++++++
.../ftrace/test.d/trigger/trigger-multihist.tc | 73 +++++++++++++++++++
3 files changed, 221 insertions(+)
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
new file mode 100644
index 0000000..57e350a
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
@@ -0,0 +1,65 @@
+#!/bin/sh
+# description: event trigger - test histogram modifiers
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep hist events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+echo "Test histogram with execname modifier"
+
+echo 'hist:keys=common_pid.execname' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+COMM=`cat /proc/$$/comm`
+grep "common_pid: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
+ fail "execname modifier on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with hex modifier"
+
+echo 'hist:keys=parent_pid.hex' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+# Note that $$ is the parent pid. $PID is current PID.
+HEX=`printf %x $PID`
+grep "parent_pid: $HEX" events/sched/sched_process_fork/hist > /dev/null || \
+ fail "hex modifier on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with syscall modifier"
+
+echo 'hist:keys=id.syscall' > events/raw_syscalls/sys_exit/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep "id: sys_" events/raw_syscalls/sys_exit/hist > /dev/null || \
+ fail "syscall modifier on raw_syscalls/sys_exit did not work"
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
new file mode 100644
index 0000000..b2902d4
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
@@ -0,0 +1,83 @@
+#!/bin/sh
+# description: event trigger - test histogram trigger
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep hist events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+echo "Test histogram basic tigger"
+
+echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep parent_pid events/sched/sched_process_fork/hist > /dev/null || \
+ fail "hist trigger on sched_process_fork did not work"
+grep child events/sched/sched_process_fork/hist > /dev/null || \
+ fail "hist trigger on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with compound keys"
+
+echo 'hist:keys=parent_pid,child_pid' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep '^{ parent_pid:.*, child_pid:.*}' events/sched/sched_process_fork/hist > /dev/null || \
+ fail "compound keys on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with string key"
+
+echo 'hist:keys=parent_comm' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+COMM=`cat /proc/$$/comm`
+grep "parent_comm: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
+ fail "string key on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with sort key"
+
+echo 'hist:keys=parent_pid,child_pid:sort=child_pid.ascending' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+
+check_inc() {
+ while [ $# -gt 1 ]; do
+ [ $1 -gt $2 ] && return 1
+ shift 1
+ done
+ return 0
+}
+check_inc `grep -o "child_pid:[[:space:]]*[[:digit:]]*" \
+ events/sched/sched_process_fork/hist | cut -d: -f2 ` ||
+ fail "sort param on sched_process_fork did not work"
+
+do_reset
+
+exit 0
diff --git a/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc b/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
new file mode 100644
index 0000000..03c4a46
--- /dev/null
+++ b/tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
@@ -0,0 +1,73 @@
+#!/bin/sh
+# description: event trigger - test multiple histogram triggers
+
+do_reset() {
+ reset_trigger
+ echo > set_event
+ clear_trace
+}
+
+fail() { #msg
+ do_reset
+ echo $1
+ exit $FAIL
+}
+
+if [ ! -f set_event -o ! -d events/sched ]; then
+ echo "event tracing is not supported"
+ exit_unsupported
+fi
+
+if [ ! -f events/sched/sched_process_fork/trigger ]; then
+ echo "event trigger is not supported"
+ exit_unsupported
+fi
+
+reset_tracer
+do_reset
+
+FEATURE=`grep hist events/sched/sched_process_fork/trigger`
+if [ -z "$FEATURE" ]; then
+ echo "hist trigger is not supported"
+ exit_unsupported
+fi
+
+reset_trigger
+
+echo "Test histogram multiple tiggers"
+
+echo 'hist:keys=parent_pid:vals=child_pid' > events/sched/sched_process_fork/trigger
+echo 'hist:keys=parent_comm:vals=child_pid' >> events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep parent_pid events/sched/sched_process_fork/hist > /dev/null || \
+ fail "hist trigger on sched_process_fork did not work"
+grep child events/sched/sched_process_fork/hist > /dev/null || \
+ fail "hist trigger on sched_process_fork did not work"
+COMM=`cat /proc/$$/comm`
+grep "parent_comm: $COMM" events/sched/sched_process_fork/hist > /dev/null || \
+ fail "string key on sched_process_fork did not work"
+
+reset_trigger
+
+echo "Test histogram with its name"
+
+echo 'hist:name=test_hist:keys=common_pid' > events/sched/sched_process_fork/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep test_hist events/sched/sched_process_fork/hist > /dev/null || \
+ fail "named event on sched_process_fork did not work"
+
+echo "Test same named histogram on different events"
+
+echo 'hist:name=test_hist:keys=common_pid' > events/sched/sched_process_exit/trigger
+for i in `seq 1 10` ; do ( echo "forked" > /dev/null); done
+grep test_hist events/sched/sched_process_exit/hist > /dev/null || \
+ fail "named event on sched_process_fork did not work"
+
+diffs=`diff events/sched/sched_process_exit/hist events/sched/sched_process_fork/hist | wc -l`
+test $diffs -eq 0 || fail "Same name histograms are not same"
+
+reset_trigger
+
+do_reset
+
+exit 0
--
1.9.3
From: Namhyung Kim <[email protected]>
Allow users to have numeric fields displayed as log2 values in case
value range is very wide by appending '.log2' to field names.
For example,
# echo 'hist:key=bytes_req' > kmalloc/trigger
# cat kmalloc/hist
{ bytes_req: 504 } hitcount: 1
{ bytes_req: 11 } hitcount: 1
{ bytes_req: 104 } hitcount: 1
{ bytes_req: 48 } hitcount: 1
{ bytes_req: 2048 } hitcount: 1
{ bytes_req: 4096 } hitcount: 1
{ bytes_req: 240 } hitcount: 1
{ bytes_req: 392 } hitcount: 1
{ bytes_req: 13 } hitcount: 1
{ bytes_req: 28 } hitcount: 1
{ bytes_req: 12 } hitcount: 1
{ bytes_req: 64 } hitcount: 2
{ bytes_req: 128 } hitcount: 2
{ bytes_req: 32 } hitcount: 2
{ bytes_req: 8 } hitcount: 11
{ bytes_req: 10 } hitcount: 13
{ bytes_req: 24 } hitcount: 25
{ bytes_req: 160 } hitcount: 29
{ bytes_req: 16 } hitcount: 33
{ bytes_req: 80 } hitcount: 36
When using '.log2' modifier, the output looks like:
# echo 'hist:key=bytes_req.log2' > kmalloc/trigger
# cat kmalloc/hist
{ bytes_req: ~ 2^12 } hitcount: 1
{ bytes_req: ~ 2^11 } hitcount: 1
{ bytes_req: ~ 2^9 } hitcount: 2
{ bytes_req: ~ 2^6 } hitcount: 3
{ bytes_req: ~ 2^3 } hitcount: 13
{ bytes_req: ~ 2^5 } hitcount: 19
{ bytes_req: ~ 2^8 } hitcount: 49
{ bytes_req: ~ 2^7 } hitcount: 57
{ bytes_req: ~ 2^4 } hitcount: 74
Cc: Tom Zanussi <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Signed-off-by: Namhyung Kim <[email protected]>
Reviewed-by: Masami Hiramatsu <[email protected]>
Signed-off-by: Tom Zanussi <[email protected]>
---
kernel/trace/trace.c | 1 +
kernel/trace/trace_events_hist.c | 20 ++++++++++++++++++++
2 files changed, 21 insertions(+)
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 75b612c..6546a3e 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3863,6 +3863,7 @@ static const char readme_msg[] =
"\t .sym-offset display an address as a symbol and offset\n"
"\t .execname display a common_pid as a program name\n"
"\t .syscall display a syscall id as a syscall name\n\n"
+ "\t .log2 display log2 value rather than raw number\n\n"
"\t The 'pause' parameter can be used to pause an existing hist\n"
"\t trigger or to start a hist trigger but not log any events\n"
"\t until told to do so. 'continue' can be used to start or\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 1338da2..53e7d7b 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -68,6 +68,13 @@ static u64 hist_field_pstring(struct hist_field *hist_field, void *event)
return (u64)(unsigned long)*addr;
}
+static u64 hist_field_log2(struct hist_field *hist_field, void *event)
+{
+ u64 val = *(u64 *)(event + hist_field->field->offset);
+
+ return (u64) ilog2(roundup_pow_of_two(val));
+}
+
#define DEFINE_HIST_FIELD_FN(type) \
static u64 hist_field_##type(struct hist_field *hist_field, void *event)\
{ \
@@ -112,6 +119,7 @@ enum hist_field_flags {
HIST_FIELD_EXECNAME = 64,
HIST_FIELD_SYSCALL = 128,
HIST_FIELD_STACKTRACE = 256,
+ HIST_FIELD_LOG2 = 512,
};
struct hist_trigger_attrs {
@@ -359,6 +367,11 @@ static struct hist_field *create_hist_field(struct ftrace_event_field *field,
goto out;
}
+ if (flags & HIST_FIELD_LOG2) {
+ hist_field->fn = hist_field_log2;
+ goto out;
+ }
+
if (is_string_field(field)) {
flags |= HIST_FIELD_STRING;
@@ -510,6 +523,8 @@ static int create_key_field(struct hist_trigger_data *hist_data,
flags |= HIST_FIELD_EXECNAME;
else if (!strcmp(field_str, "syscall"))
flags |= HIST_FIELD_SYSCALL;
+ else if (!strcmp(field_str, "log2"))
+ flags |= HIST_FIELD_LOG2;
else {
ret = -EINVAL;
goto out;
@@ -962,6 +977,9 @@ hist_trigger_entry_print(struct seq_file *m,
key + key_field->offset,
HIST_STACKTRACE_DEPTH);
multiline = true;
+ } else if (key_field->flags & HIST_FIELD_LOG2) {
+ seq_printf(m, "%s: ~ 2^%-2llu", key_field->field->name,
+ *(u64 *)(key + key_field->offset));
} else if (key_field->flags & HIST_FIELD_STRING) {
seq_printf(m, "%s: %-50s", key_field->field->name,
(char *)(key + key_field->offset));
@@ -1094,6 +1112,8 @@ static const char *get_hist_field_flags(struct hist_field *hist_field)
flags_str = "execname";
else if (hist_field->flags & HIST_FIELD_SYSCALL)
flags_str = "syscall";
+ else if (hist_field->flags & HIST_FIELD_LOG2)
+ flags_str = "log2";
return flags_str;
}
--
1.9.3
On Mon, 23 Nov 2015 13:51:16 -0600
Tom Zanussi <[email protected]> wrote:
> When a trigger is enabled, the cond flag should be set beforehand,
> otherwise a trigger that's expecting to process a trace record
> (e.g. one with post_trigger set) could be invoked without one.
>
> Likewise a trigger's cond flag should be reset after it's disabled,
> not before.
>
> Signed-off-by: Tom Zanussi <[email protected]>
> Signed-off-by: Daniel Wagner <[email protected]>
> Reviewed-by: Masami Hiramatsu <[email protected]>
> Tested-by: Masami Hiramatsu <[email protected]>
> ---
FYI, I've applied this patch as it looks like something that should be
added regardless of the rest of the series.
-- Steve
Hi Steve and Tom,
On Mon, Nov 23, 2015 at 04:29:43PM -0500, Steven Rostedt wrote:
> On Mon, 23 Nov 2015 13:51:16 -0600
> Tom Zanussi <[email protected]> wrote:
>
> > When a trigger is enabled, the cond flag should be set beforehand,
> > otherwise a trigger that's expecting to process a trace record
> > (e.g. one with post_trigger set) could be invoked without one.
> >
> > Likewise a trigger's cond flag should be reset after it's disabled,
> > not before.
> >
> > Signed-off-by: Tom Zanussi <[email protected]>
> > Signed-off-by: Daniel Wagner <[email protected]>
> > Reviewed-by: Masami Hiramatsu <[email protected]>
> > Tested-by: Masami Hiramatsu <[email protected]>
> > ---
>
> FYI, I've applied this patch as it looks like something that should be
> added regardless of the rest of the series.
You can add my Reviewed-by if you want. I'll try to review others soon.
Thanks,
Namhyung
Hi Tom,
On Mon, Nov 23, 2015 at 01:51:25PM -0600, Tom Zanussi wrote:
> 'hist' triggers allow users to continually aggregate trace events,
> which can then be viewed afterwards by simply reading a 'hist' file
> containing the aggregation in a human-readable format.
>
> The basic idea is very simple and boils down to a mechanism whereby
> trace events, rather than being exhaustively dumped in raw form and
> viewed directly, are automatically 'compressed' into meaningful tables
> completely defined by the user.
>
> This is done strictly via single-line command-line commands and
> without the aid of any kind of programming language or interpreter.
>
> A surprising number of typical use cases can be accomplished by users
> via this simple mechanism. In fact, a large number of the tasks that
> users typically do using the more complicated script-based tracing
> tools, at least during the initial stages of an investigation, can be
> accomplished by simply specifying a set of keys and values to be used
> in the creation of a hash table.
>
> The Linux kernel trace event subsystem happens to provide an extensive
> list of keys and values ready-made for such a purpose in the form of
> the event format files associated with each trace event. By simply
> consulting the format file for field names of interest and by plugging
> them into the hist trigger command, users can create an endless number
> of useful aggregations to help with investigating various properties
> of the system. See Documentation/trace/events.txt for examples.
>
> hist triggers are implemented on top of the existing event trigger
> infrastructure, and as such are consistent with the existing triggers
> from a user's perspective as well.
>
> The basic syntax follows the existing trigger syntax. Users start an
> aggregation by writing a 'hist' trigger to the event of interest's
> trigger file:
>
> # echo hist:keys=xxx [ if filter] > event/trigger
>
> Once a hist trigger has been set up, by default it continually
> aggregates every matching event into a hash table using the event key
> and a value field named 'hitcount'.
>
> To view the aggregation at any point in time, simply read the 'hist'
> file in the same directory as the 'trigger' file:
>
> # cat event/hist
>
> The detailed syntax provides additional options for user control, and
> is described exhaustively in Documentation/trace/events.txt and in the
> virtual tracing/README file in the tracing subsystem.
>
> Signed-off-by: Tom Zanussi <[email protected]>
> Tested-by: Masami Hiramatsu <[email protected]>
> ---
[SNIP]
> +static struct hist_trigger_data *
> +create_hist_data(unsigned int map_bits,
> + struct hist_trigger_attrs *attrs,
> + struct trace_event_file *file)
> +{
> + struct hist_trigger_data *hist_data;
> + int ret = 0;
> +
> + hist_data = kzalloc(sizeof(*hist_data), GFP_KERNEL);
> + if (!hist_data)
> + return ERR_PTR(-ENOMEM);
> +
> + hist_data->attrs = attrs;
> +
> + ret = create_hist_fields(hist_data, file);
> + if (ret < 0)
> + goto free;
> +
> + ret = create_sort_keys(hist_data);
> + if (ret < 0)
> + goto free;
> +
> + hist_data->map = tracing_map_create(map_bits, hist_data->key_size,
> + NULL, hist_data);
> + if (IS_ERR(hist_data->map)) {
> + ret = PTR_ERR(hist_data->map);
> + hist_data->map = NULL;
> + goto free;
> + }
> +
> + ret = create_tracing_map_fields(hist_data);
> + if (ret)
> + goto free;
> +
> + ret = tracing_map_init(hist_data->map);
> + if (ret)
> + goto free;
> +
> + hist_data->event_file = file;
> + out:
> + return hist_data;
> + free:
> + hist_data->attrs = NULL;
> +
> + destroy_hist_data(hist_data);
> + if (ret)
> + hist_data = ERR_PTR(ret);
> + else
> + hist_data = NULL;
Is this else part really needed? It seems that all code path to here
set the 'ret' non-zero. Otherwise ...
> +
> + goto out;
> +}
[SNIP]
> +static int event_hist_trigger_func(struct event_command *cmd_ops,
> + struct trace_event_file *file,
> + char *glob, char *cmd, char *param)
> +{
> + unsigned int hist_trigger_bits = TRACING_MAP_BITS_DEFAULT;
> + struct event_trigger_data *trigger_data;
> + struct hist_trigger_attrs *attrs;
> + struct event_trigger_ops *trigger_ops;
> + struct hist_trigger_data *hist_data;
> + char *trigger;
> + int ret = 0;
> +
> + if (!param)
> + return -EINVAL;
> +
> + /* separate the trigger from the filter (k:v [if filter]) */
> + trigger = strsep(¶m, " \t");
> + if (!trigger)
> + return -EINVAL;
> +
> + attrs = parse_hist_trigger_attrs(trigger);
> + if (IS_ERR(attrs))
> + return PTR_ERR(attrs);
> +
> + if (attrs->map_bits)
> + hist_trigger_bits = attrs->map_bits;
> +
> + hist_data = create_hist_data(hist_trigger_bits, attrs, file);
> + if (IS_ERR(hist_data)) {
... it should be IS_ERR_OR_NULL(hist_data) then.
Thanks,
Namhyung
> + destroy_hist_trigger_attrs(attrs);
> + return PTR_ERR(hist_data);
> + }
> +
> + trigger_ops = cmd_ops->get_trigger_ops(cmd, trigger);
> +
> + ret = -ENOMEM;
> + trigger_data = kzalloc(sizeof(*trigger_data), GFP_KERNEL);
> + if (!trigger_data)
> + goto out_free;
> +
> + trigger_data->count = -1;
> + trigger_data->ops = trigger_ops;
> + trigger_data->cmd_ops = cmd_ops;
> +
> + INIT_LIST_HEAD(&trigger_data->list);
> + RCU_INIT_POINTER(trigger_data->filter, NULL);
> +
> + trigger_data->private_data = hist_data;
> +
> + if (glob[0] == '!') {
> + cmd_ops->unreg(glob+1, trigger_ops, trigger_data, file);
> + ret = 0;
> + goto out_free;
> + }
> +
> + if (!param) /* if param is non-empty, it's supposed to be a filter */
> + goto out_reg;
> +
> + if (!cmd_ops->set_filter)
> + goto out_reg;
> +
> + ret = cmd_ops->set_filter(param, trigger_data, file);
> + if (ret < 0)
> + goto out_free;
> + out_reg:
> + ret = cmd_ops->reg(glob, trigger_ops, trigger_data, file);
> + /*
> + * The above returns on success the # of triggers registered,
> + * but if it didn't register any it returns zero. Consider no
> + * triggers registered a failure too.
> + */
> + if (!ret) {
> + ret = -ENOENT;
> + goto out_free;
> + } else if (ret < 0)
> + goto out_free;
> + /* Just return zero, not the number of registered triggers */
> + ret = 0;
> + out:
> + return ret;
> + out_free:
> + if (cmd_ops->set_filter)
> + cmd_ops->set_filter(NULL, trigger_data, NULL);
> +
> + kfree(trigger_data);
> +
> + destroy_hist_data(hist_data);
> + goto out;
> +}
> +
> +static struct event_command trigger_hist_cmd = {
> + .name = "hist",
> + .trigger_type = ETT_EVENT_HIST,
> + .needs_rec = true,
> + .func = event_hist_trigger_func,
> + .reg = hist_register_trigger,
> + .unreg = unregister_trigger,
> + .get_trigger_ops = event_hist_get_trigger_ops,
> + .set_filter = set_trigger_filter,
> +};
> +
> +__init int register_trigger_hist_cmd(void)
> +{
> + int ret;
> +
> + ret = register_event_command(&trigger_hist_cmd);
> + WARN_ON(ret < 0);
> +
> + return ret;
> +}
> diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
> index 362ae86..1f1db3c 100644
> --- a/kernel/trace/trace_events_trigger.c
> +++ b/kernel/trace/trace_events_trigger.c
> @@ -1452,6 +1452,7 @@ __init int register_trigger_cmds(void)
> register_trigger_snapshot_cmd();
> register_trigger_stacktrace_cmd();
> register_trigger_enable_disable_cmds();
> + register_trigger_hist_cmd();
>
> return 0;
> }
> --
> 1.9.3
>
On Mon, Nov 23, 2015 at 01:51:15PM -0600, Tom Zanussi wrote:
> This is v12 of the 'hist triggers' patchset, incorporating suggestions
> and fixing problems pointed out by Namhyung.
Thanks for doing this work! This version looks good to me although I
have a small nitpick in the 10/30. With that fixed, you can add my
Reviewed-by: Namhyung Kim <[email protected]>
to this patchset.
Thanks,
Namhyung
>
> Changes from v11:
>
> - Added tracing_map_lookup().
> - Changed tracing_map_insert() to incorporate the hits/drops counter
> updating. The changes allow clients to continue calling
> tracing_map_insert() and update existing entries if desired, or
> stop on the first drop, since the return value is still NULL in
> that case.
> - Changed the hist trigger code to continue calling
> tracing_map_insert() rather than stopping on the first drop. The
> idea is that there's no harm in continuing after the first drop -
> if the user can't tolerate any drops, they'll still see a non-zero
> drop count and can retry with a larger table, but if the user
> doesn't care, the hit and drop counts are an accurate reflection
> of how many events were tallied vs dropped.
> - Added a new unreg_all() callback to event_command, and code to
> call it when the trigger file is opened for truncate. Implemented
> unreg_all() for hist triggers, which allows them to honor the
> truncate flag while leaving existing triggers intact. This means
> that '>>' should now be used for adding multiple hist triggers as
> well as to clear/pause/cont an existing hist trigger.
> - Included Namhyung's log2 patch.
> - Fixed one of Masami's test cases which now requires using '>>' due
> to the truncate changes.
> - 'cont' and 'clear' no longer create a trigger if one doesn't exist.
> - Rebased to latest trace/for-next.
> - Various other smaller fixes and Documentation updates as noted by
> Namhyung.
>
> Changes from v10:
>
> - Rebased to latest trace/for-next.
> - Added Masami's ftrace/hist triggers kselftest patches.
> - Added Masami's Tested-by: to the series.
>
> Changes from v9:
>
> v10 adds some major new features - 'named' hist triggers and support
> for multiple hist triggers on a single event - basically all of the
> features and suggestions suggested by Masami, except for one: I
> decided after all not to implement the 'pause/continue/clear' commands
> on the hist file. I've gotten so used to the habit of calling up the
> previous trigger-setting command in the command history and simply
> appending a 'pause/cont/clear' command to it (and later removing it by
> prepending a '!') that making the user change the command doesn't seem
> as naturally usable. Masami, if you disagree, let me know and I'll
> reconsider it but at this point I'd rather not make that change.
>
> In addition, I think I've fixed all the other various smaller problems
> mentioned in the previous review, please let me know if I missed any...
>
> - Added support for 'named' hist triggers
> - Added support for multiple hist triggers on a single trace event
> - Added documentation and examples for the above new features
> - Streamlined the README to only include the essentials for hist triggers
> - Fixed the 'hex' modifier for values, which was previously ignored
> - Replaced the kmalloc of large arrays with a simple page-based scheme
> - Fixed the tracing_map_insert() case where jhash returns 0
> - Fixed various other small problems noted along the way
>
> Changes from v8:
>
> Same as v8, but with the RFC patch [ftrace: Add function_hist tracer]
> removed, and rebased to latest trace/for-next.
>
> Changes from v7:
>
> This version refactors the commits as suggested by Masami. There are
> now more commits, but the result should be much more reviewable. The
> ending code is the same as before, modulo a couple minor bug fixes I
> discovered while refactoring and testing.
>
> I've also reviewed and fixed a number of shortcomings and errors in
> the comments, and have added a new discussion of the tracing_map data
> structures after Steve mentioned he found them confusing and/or
> insufficiently documented.
>
> Also, I kept Namhyung's string patch [tracing: Support string type key
> properly] as submitted, but added a follow-on patch that refactors it
> and fixes a problem I found with it that enabled static string keys to
> contain random chars and therefore incorrect map insertions.
>
> Changes from v6:
>
> This version adds a new 'sym-offset' modifier as requested by Masami.
> I implemented it as a modifier rather than using the trace option as
> suggested, in part because I wanted to keep it all self-contained and
> it seemed more consistent to just add it alongside the 'sym' modifier.
> Also, hist triggers arent't really a tracer and therefore don't
> directly tie into the option update/callback mechanism so making use
> of it isn't as simple as a normal tracer.
>
> I also changed the sort key specification to be stricter and signal an
> error if the specified sort key wasn't found (rather than defaulting
> to hitcount in those cases), also suggested by Masami. Thanks,
> Masami, for your input!
>
> Also updated the Documentation and tracing/README to reflect the
> changes.
>
> Changes from v5:
>
> This version adds support for compound keys, along with the related
> ability to sort using primary and secondary keys. This was mentioned
> in previous versions as the last important piece that remained
> unimplemented, and is now implemented. (I didn't have time to get to
> the couple of enhancements suggested by Masami, but I expect to be
> able to add those later on top of these.)
>
> Because we now support compound keys and it's not immediately clear in
> the output exactly which fields correspond to keys, the key(s),
> compound or not, are now enclosed by curly braces.
>
> The Documentation and README have been updated to reflect the changes,
> and several new examples have been added to illustrate how to use
> compound keys.
>
> Also, the code was updated to work with the new ftrace_event_file,
> etc, renaming in tracing/for-next.
>
> Changes from v4:
>
> This version addresses some problems and suggestions made by Daniel
> Wagner - a lot of the code was reworked to get rid of the distinction
> between keys and values, and as a result, both keys and values can be
> used as sort keys. As suggested, it also allows 'val=' to be absent
> in a trigger command - if no 'val' is specified, hitcount is assumed
> and automatically used as the only val.
>
> The map code was also separated out into a separate file,
> tracing_map.c, allowing it to be reused. It also adds a second tracer
> called function_hist that actually does reuse the code, as an RFC
> patch.
>
> Patch 01/10 [tracing: Update cond flag when enabling or disabling..]
> is a fix for a problem noticed by Daniel and that fixes a problem in
> existing trigger code and should be applied regardless of whether the
> rest of the patchset is merged.
>
> As mentioned, patch 10/10 is an RFC patch implementing a new tracer
> based on the function tracer code. It's a fun little tool and is
> useful for a specific problem I'm working on (and is also a nice test
> of the tracing_map code), but is an RFC because first, I'm not sure it
> would really be of general interest and secondly, it's POC-level
> quality and I'd need to spend more time fixing it up to make it
> upstreamable, but I don't want to waste my time if not.
>
> There are a couple of important bits of functionality that were
> present in v1 but not yet reimplemented in v5.
>
> The first is support for compound keys. Currently, maps can only be
> keyed on a single event field, whereas in v1 they could be keyed on
> multiple keys. With support for compound keys, you can create much
> more interesting output, such as for example per-pid lists of
> syscalls or read counts e.g.:
>
> # echo 'hist:keys=common_pid.execname,id.syscall:vals=hitcount' > \
> /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
>
> # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
>
> key: common_pid:bash[3112], id:sys_write vals: count:69
> key: common_pid:bash[3112], id:sys_rt_sigprocmask vals: count:218
>
> key: common_pid:update-notifier[3164], id:sys_poll vals: count:37
> key: common_pid:update-notifier[3164], id:sys_recvfrom vals: count:118
>
> key: common_pid:deja-dup-monito[3194], id:sys_sendto vals: count:1
> key: common_pid:deja-dup-monito[3194], id:sys_read vals: count:4
> key: common_pid:deja-dup-monito[3194], id:sys_poll vals: count:8
> key: common_pid:deja-dup-monito[3194], id:sys_recvmsg vals: count:8
> key: common_pid:deja-dup-monito[3194], id:sys_getegid vals: count:8
>
> key: common_pid:emacs[3275], id:sys_fsync vals: count:1
> key: common_pid:emacs[3275], id:sys_open vals: count:1
> key: common_pid:emacs[3275], id:sys_symlink vals: count:2
> key: common_pid:emacs[3275], id:sys_poll vals: count:23
> key: common_pid:emacs[3275], id:sys_select vals: count:23
> key: common_pid:emacs[3275], id:unknown_syscall vals: count:34
> key: common_pid:emacs[3275], id:sys_ioctl vals: count:60
> key: common_pid:emacs[3275], id:sys_rt_sigprocmask vals: count:116
>
> key: common_pid:cat[3323], id:sys_munmap vals: count:1
> key: common_pid:cat[3323], id:sys_fadvise64 vals: count:1
>
> Related to that is support for sorting on multiple fields. Currently,
> you can sort using only a primary key. Being able to sort on multiple
> or at least a secondary key is indispensible for seeing trends when
> displaying multiple values.
>
> Changes from v3:
>
> v4 fixes the race in tracing_map_insert() noted in v3, where
> map.val.key could be checked even if map.val wasn't yet set. The
> simple fix for that in tracing_map_insert() introduces the possibility
> of duplicates in the map, which though rare, need to be accounted for
> in the output. To address that, duplicate-merging code was added to
> the map-printing code.
>
> It was also pointed out that it didn't seem correct to include
> module.h, but the fix for that has deeper roots and is being addressed
> by a separate patchset; for now we need to continue including
> module.h, though prompted by that I did some other header include
> cleanup.
>
> The functionality remains the same as v2, but this version no longer
> tries to export and use bpf_maps, and more importantly removes the
> associated GFP_NOTRACE/trace event hacks and kmem macros required to
> work around the bpf_map implementation.
>
> The tracing_map functionality is instead built on top of a simple
> lock-free map algorithm originated by Dr. Cliff Click (see references
> in the code for more details), which though too restrictive to be
> general-purpose in its current form, functions nicely as a
> special-purpose tracing map.
>
> v3 also moves the hist triggers code into a separate file and puts it
> all behind a new config option, CONFIG_HIST_TRIGGERS. It also merges
> in the sorting code rather than keeping it as a separate patch.
>
> This patchset also includes a couple other new and related triggers,
> enable_hist and disable_hist, very similar to the existing
> enable_event/disable_event triggers used to automatically enable and
> disable events based on a triggering condition, but in this case
> allowing hist triggers to be enabled and disabled in the same way.
>
> - Added an insert check for val before checking the key associated with val
> - Added code to merge possible duplicates in the map
>
> Changes from v2:
> - reimplemented tracing_map, replacing bpf_map with nmi-safe/lock-free map
> - removed GPF_NOTRACE, kmalloc/free macros and event hacks needed by bpf_maps
> - moved hist triggers from trace_events_trigger.c to trace_events_hist.c
> - added CONFIG_HIST_TRIGGERS config option
> - consolidated sorting code with main patch
>
> Changes from v1:
> - completely rewritten on top of tracing_map (renamed and exported bpf_map)
> - added map clearing and client ops to tracing_map
> - changed the name from 'hash' triggers to 'hist' triggers
> - added new trigger 'pause' feature
> - added new enable_hist and disable_hist triggers
> - added usage for hist/enable_hist/disable hist to tracing/README
> - moved examples into Documentation/trace/event.txt
> - added ___GFP_NOTRACE, kmalloc/kfree macros, and conditional kmem tracepoints
>
> The following changes since commit e428abbbf616cd8fdd1162e4a624ad1d47b47544:
>
> tracing: #ifdef out uses of max trace when CONFIG_TRACER_MAX_TRACE is not set (2015-11-10 10:16:05 -0500)
>
> are available in the git repository at:
>
> git://git.yoctoproject.org/linux-yocto-contrib.git tzanussi/hist-triggers-v12
> http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/log/?h=tzanussi/hist-triggers-v12
>
> Masami Hiramatsu (2):
> kselftests/ftrace : Add event trigger testcases
> kselftests/ftrace: Add hist trigger testcases
>
> Namhyung Kim (2):
> tracing: Support string type key properly
> tracing: Add hist trigger 'log2' modifier
>
> Tom Zanussi (26):
> tracing: Update cond flag when enabling or disabling a trigger
> tracing: Make ftrace_event_field checking functions available
> tracing: Make event trigger functions available
> tracing: Add event record param to trigger_ops.func()
> tracing: Add get_syscall_name()
> tracing: Add a per-event-trigger 'paused' field
> tracing: Add needs_rec flag to event triggers
> tracing: Add an unreg_all() callback to trigger commands
> tracing: Add lock-free tracing_map
> tracing: Add 'hist' event trigger command
> tracing: Add hist trigger support for multiple values ('vals=' param)
> tracing: Add hist trigger support for compound keys
> tracing: Add hist trigger support for user-defined sorting ('sort='
> param)
> tracing: Add hist trigger support for pausing and continuing a trace
> tracing: Add hist trigger support for clearing a trace
> tracing: Add hist trigger 'hex' modifier for displaying numeric fields
> tracing: Add hist trigger 'sym' and 'sym-offset' modifiers
> tracing: Add hist trigger 'execname' modifier
> tracing: Add hist trigger 'syscall' modifier
> tracing: Add hist trigger support for stacktraces as keys
> tracing: Remove restriction on string position in hist trigger keys
> tracing: Add enable_hist/disable_hist triggers
> tracing: Add 'hist' trigger Documentation
> tracing: Add support for multiple hist triggers per event
> tracing: Add support for named triggers
> tracing: Add support for named hist triggers
>
> Documentation/trace/events.txt | 1555 ++++++++++++++++++
> include/linux/trace_events.h | 9 +-
> kernel/trace/Kconfig | 27 +
> kernel/trace/Makefile | 2 +
> kernel/trace/trace.c | 57 +
> kernel/trace/trace.h | 106 +-
> kernel/trace/trace_events.c | 4 +
> kernel/trace/trace_events_filter.c | 12 -
> kernel/trace/trace_events_hist.c | 1731 ++++++++++++++++++++
> kernel/trace/trace_events_trigger.c | 309 +++-
> kernel/trace/trace_syscalls.c | 11 +
> kernel/trace/tracing_map.c | 1058 ++++++++++++
> kernel/trace/tracing_map.h | 282 ++++
> tools/testing/selftests/ftrace/test.d/functions | 9 +
> .../ftrace/test.d/trigger/trigger-eventonoff.tc | 64 +
> .../ftrace/test.d/trigger/trigger-filter.tc | 59 +
> .../ftrace/test.d/trigger/trigger-hist-mod.tc | 65 +
> .../ftrace/test.d/trigger/trigger-hist.tc | 83 +
> .../ftrace/test.d/trigger/trigger-multihist.tc | 73 +
> .../ftrace/test.d/trigger/trigger-snapshot.tc | 56 +
> .../ftrace/test.d/trigger/trigger-stacktrace.tc | 53 +
> .../ftrace/test.d/trigger/trigger-traceonoff.tc | 58 +
> 22 files changed, 5596 insertions(+), 87 deletions(-)
> create mode 100644 kernel/trace/trace_events_hist.c
> create mode 100644 kernel/trace/tracing_map.c
> create mode 100644 kernel/trace/tracing_map.h
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
> create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
>
> --
> 1.9.3
>
On Mon, 2015-11-30 at 00:22 +0900, Namhyung Kim wrote:
> On Mon, Nov 23, 2015 at 01:51:15PM -0600, Tom Zanussi wrote:
> > This is v12 of the 'hist triggers' patchset, incorporating suggestions
> > and fixing problems pointed out by Namhyung.
>
> Thanks for doing this work! This version looks good to me although I
> have a small nitpick in the 10/30. With that fixed, you can add my
>
> Reviewed-by: Namhyung Kim <[email protected]>
>
> to this patchset.
>
Thanks for your review, Namhyung - I just posted a new patchset with
that fix..
Tom
> Thanks,
> Namhyung
>
>
> >
> > Changes from v11:
> >
> > - Added tracing_map_lookup().
> > - Changed tracing_map_insert() to incorporate the hits/drops counter
> > updating. The changes allow clients to continue calling
> > tracing_map_insert() and update existing entries if desired, or
> > stop on the first drop, since the return value is still NULL in
> > that case.
> > - Changed the hist trigger code to continue calling
> > tracing_map_insert() rather than stopping on the first drop. The
> > idea is that there's no harm in continuing after the first drop -
> > if the user can't tolerate any drops, they'll still see a non-zero
> > drop count and can retry with a larger table, but if the user
> > doesn't care, the hit and drop counts are an accurate reflection
> > of how many events were tallied vs dropped.
> > - Added a new unreg_all() callback to event_command, and code to
> > call it when the trigger file is opened for truncate. Implemented
> > unreg_all() for hist triggers, which allows them to honor the
> > truncate flag while leaving existing triggers intact. This means
> > that '>>' should now be used for adding multiple hist triggers as
> > well as to clear/pause/cont an existing hist trigger.
> > - Included Namhyung's log2 patch.
> > - Fixed one of Masami's test cases which now requires using '>>' due
> > to the truncate changes.
> > - 'cont' and 'clear' no longer create a trigger if one doesn't exist.
> > - Rebased to latest trace/for-next.
> > - Various other smaller fixes and Documentation updates as noted by
> > Namhyung.
> >
> > Changes from v10:
> >
> > - Rebased to latest trace/for-next.
> > - Added Masami's ftrace/hist triggers kselftest patches.
> > - Added Masami's Tested-by: to the series.
> >
> > Changes from v9:
> >
> > v10 adds some major new features - 'named' hist triggers and support
> > for multiple hist triggers on a single event - basically all of the
> > features and suggestions suggested by Masami, except for one: I
> > decided after all not to implement the 'pause/continue/clear' commands
> > on the hist file. I've gotten so used to the habit of calling up the
> > previous trigger-setting command in the command history and simply
> > appending a 'pause/cont/clear' command to it (and later removing it by
> > prepending a '!') that making the user change the command doesn't seem
> > as naturally usable. Masami, if you disagree, let me know and I'll
> > reconsider it but at this point I'd rather not make that change.
> >
> > In addition, I think I've fixed all the other various smaller problems
> > mentioned in the previous review, please let me know if I missed any...
> >
> > - Added support for 'named' hist triggers
> > - Added support for multiple hist triggers on a single trace event
> > - Added documentation and examples for the above new features
> > - Streamlined the README to only include the essentials for hist triggers
> > - Fixed the 'hex' modifier for values, which was previously ignored
> > - Replaced the kmalloc of large arrays with a simple page-based scheme
> > - Fixed the tracing_map_insert() case where jhash returns 0
> > - Fixed various other small problems noted along the way
> >
> > Changes from v8:
> >
> > Same as v8, but with the RFC patch [ftrace: Add function_hist tracer]
> > removed, and rebased to latest trace/for-next.
> >
> > Changes from v7:
> >
> > This version refactors the commits as suggested by Masami. There are
> > now more commits, but the result should be much more reviewable. The
> > ending code is the same as before, modulo a couple minor bug fixes I
> > discovered while refactoring and testing.
> >
> > I've also reviewed and fixed a number of shortcomings and errors in
> > the comments, and have added a new discussion of the tracing_map data
> > structures after Steve mentioned he found them confusing and/or
> > insufficiently documented.
> >
> > Also, I kept Namhyung's string patch [tracing: Support string type key
> > properly] as submitted, but added a follow-on patch that refactors it
> > and fixes a problem I found with it that enabled static string keys to
> > contain random chars and therefore incorrect map insertions.
> >
> > Changes from v6:
> >
> > This version adds a new 'sym-offset' modifier as requested by Masami.
> > I implemented it as a modifier rather than using the trace option as
> > suggested, in part because I wanted to keep it all self-contained and
> > it seemed more consistent to just add it alongside the 'sym' modifier.
> > Also, hist triggers arent't really a tracer and therefore don't
> > directly tie into the option update/callback mechanism so making use
> > of it isn't as simple as a normal tracer.
> >
> > I also changed the sort key specification to be stricter and signal an
> > error if the specified sort key wasn't found (rather than defaulting
> > to hitcount in those cases), also suggested by Masami. Thanks,
> > Masami, for your input!
> >
> > Also updated the Documentation and tracing/README to reflect the
> > changes.
> >
> > Changes from v5:
> >
> > This version adds support for compound keys, along with the related
> > ability to sort using primary and secondary keys. This was mentioned
> > in previous versions as the last important piece that remained
> > unimplemented, and is now implemented. (I didn't have time to get to
> > the couple of enhancements suggested by Masami, but I expect to be
> > able to add those later on top of these.)
> >
> > Because we now support compound keys and it's not immediately clear in
> > the output exactly which fields correspond to keys, the key(s),
> > compound or not, are now enclosed by curly braces.
> >
> > The Documentation and README have been updated to reflect the changes,
> > and several new examples have been added to illustrate how to use
> > compound keys.
> >
> > Also, the code was updated to work with the new ftrace_event_file,
> > etc, renaming in tracing/for-next.
> >
> > Changes from v4:
> >
> > This version addresses some problems and suggestions made by Daniel
> > Wagner - a lot of the code was reworked to get rid of the distinction
> > between keys and values, and as a result, both keys and values can be
> > used as sort keys. As suggested, it also allows 'val=' to be absent
> > in a trigger command - if no 'val' is specified, hitcount is assumed
> > and automatically used as the only val.
> >
> > The map code was also separated out into a separate file,
> > tracing_map.c, allowing it to be reused. It also adds a second tracer
> > called function_hist that actually does reuse the code, as an RFC
> > patch.
> >
> > Patch 01/10 [tracing: Update cond flag when enabling or disabling..]
> > is a fix for a problem noticed by Daniel and that fixes a problem in
> > existing trigger code and should be applied regardless of whether the
> > rest of the patchset is merged.
> >
> > As mentioned, patch 10/10 is an RFC patch implementing a new tracer
> > based on the function tracer code. It's a fun little tool and is
> > useful for a specific problem I'm working on (and is also a nice test
> > of the tracing_map code), but is an RFC because first, I'm not sure it
> > would really be of general interest and secondly, it's POC-level
> > quality and I'd need to spend more time fixing it up to make it
> > upstreamable, but I don't want to waste my time if not.
> >
> > There are a couple of important bits of functionality that were
> > present in v1 but not yet reimplemented in v5.
> >
> > The first is support for compound keys. Currently, maps can only be
> > keyed on a single event field, whereas in v1 they could be keyed on
> > multiple keys. With support for compound keys, you can create much
> > more interesting output, such as for example per-pid lists of
> > syscalls or read counts e.g.:
> >
> > # echo 'hist:keys=common_pid.execname,id.syscall:vals=hitcount' > \
> > /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/trigger
> >
> > # cat /sys/kernel/debug/tracing/events/raw_syscalls/sys_enter/hist
> >
> > key: common_pid:bash[3112], id:sys_write vals: count:69
> > key: common_pid:bash[3112], id:sys_rt_sigprocmask vals: count:218
> >
> > key: common_pid:update-notifier[3164], id:sys_poll vals: count:37
> > key: common_pid:update-notifier[3164], id:sys_recvfrom vals: count:118
> >
> > key: common_pid:deja-dup-monito[3194], id:sys_sendto vals: count:1
> > key: common_pid:deja-dup-monito[3194], id:sys_read vals: count:4
> > key: common_pid:deja-dup-monito[3194], id:sys_poll vals: count:8
> > key: common_pid:deja-dup-monito[3194], id:sys_recvmsg vals: count:8
> > key: common_pid:deja-dup-monito[3194], id:sys_getegid vals: count:8
> >
> > key: common_pid:emacs[3275], id:sys_fsync vals: count:1
> > key: common_pid:emacs[3275], id:sys_open vals: count:1
> > key: common_pid:emacs[3275], id:sys_symlink vals: count:2
> > key: common_pid:emacs[3275], id:sys_poll vals: count:23
> > key: common_pid:emacs[3275], id:sys_select vals: count:23
> > key: common_pid:emacs[3275], id:unknown_syscall vals: count:34
> > key: common_pid:emacs[3275], id:sys_ioctl vals: count:60
> > key: common_pid:emacs[3275], id:sys_rt_sigprocmask vals: count:116
> >
> > key: common_pid:cat[3323], id:sys_munmap vals: count:1
> > key: common_pid:cat[3323], id:sys_fadvise64 vals: count:1
> >
> > Related to that is support for sorting on multiple fields. Currently,
> > you can sort using only a primary key. Being able to sort on multiple
> > or at least a secondary key is indispensible for seeing trends when
> > displaying multiple values.
> >
> > Changes from v3:
> >
> > v4 fixes the race in tracing_map_insert() noted in v3, where
> > map.val.key could be checked even if map.val wasn't yet set. The
> > simple fix for that in tracing_map_insert() introduces the possibility
> > of duplicates in the map, which though rare, need to be accounted for
> > in the output. To address that, duplicate-merging code was added to
> > the map-printing code.
> >
> > It was also pointed out that it didn't seem correct to include
> > module.h, but the fix for that has deeper roots and is being addressed
> > by a separate patchset; for now we need to continue including
> > module.h, though prompted by that I did some other header include
> > cleanup.
> >
> > The functionality remains the same as v2, but this version no longer
> > tries to export and use bpf_maps, and more importantly removes the
> > associated GFP_NOTRACE/trace event hacks and kmem macros required to
> > work around the bpf_map implementation.
> >
> > The tracing_map functionality is instead built on top of a simple
> > lock-free map algorithm originated by Dr. Cliff Click (see references
> > in the code for more details), which though too restrictive to be
> > general-purpose in its current form, functions nicely as a
> > special-purpose tracing map.
> >
> > v3 also moves the hist triggers code into a separate file and puts it
> > all behind a new config option, CONFIG_HIST_TRIGGERS. It also merges
> > in the sorting code rather than keeping it as a separate patch.
> >
> > This patchset also includes a couple other new and related triggers,
> > enable_hist and disable_hist, very similar to the existing
> > enable_event/disable_event triggers used to automatically enable and
> > disable events based on a triggering condition, but in this case
> > allowing hist triggers to be enabled and disabled in the same way.
> >
> > - Added an insert check for val before checking the key associated with val
> > - Added code to merge possible duplicates in the map
> >
> > Changes from v2:
> > - reimplemented tracing_map, replacing bpf_map with nmi-safe/lock-free map
> > - removed GPF_NOTRACE, kmalloc/free macros and event hacks needed by bpf_maps
> > - moved hist triggers from trace_events_trigger.c to trace_events_hist.c
> > - added CONFIG_HIST_TRIGGERS config option
> > - consolidated sorting code with main patch
> >
> > Changes from v1:
> > - completely rewritten on top of tracing_map (renamed and exported bpf_map)
> > - added map clearing and client ops to tracing_map
> > - changed the name from 'hash' triggers to 'hist' triggers
> > - added new trigger 'pause' feature
> > - added new enable_hist and disable_hist triggers
> > - added usage for hist/enable_hist/disable hist to tracing/README
> > - moved examples into Documentation/trace/event.txt
> > - added ___GFP_NOTRACE, kmalloc/kfree macros, and conditional kmem tracepoints
> >
> > The following changes since commit e428abbbf616cd8fdd1162e4a624ad1d47b47544:
> >
> > tracing: #ifdef out uses of max trace when CONFIG_TRACER_MAX_TRACE is not set (2015-11-10 10:16:05 -0500)
> >
> > are available in the git repository at:
> >
> > git://git.yoctoproject.org/linux-yocto-contrib.git tzanussi/hist-triggers-v12
> > http://git.yoctoproject.org/cgit/cgit.cgi/linux-yocto-contrib/log/?h=tzanussi/hist-triggers-v12
> >
> > Masami Hiramatsu (2):
> > kselftests/ftrace : Add event trigger testcases
> > kselftests/ftrace: Add hist trigger testcases
> >
> > Namhyung Kim (2):
> > tracing: Support string type key properly
> > tracing: Add hist trigger 'log2' modifier
> >
> > Tom Zanussi (26):
> > tracing: Update cond flag when enabling or disabling a trigger
> > tracing: Make ftrace_event_field checking functions available
> > tracing: Make event trigger functions available
> > tracing: Add event record param to trigger_ops.func()
> > tracing: Add get_syscall_name()
> > tracing: Add a per-event-trigger 'paused' field
> > tracing: Add needs_rec flag to event triggers
> > tracing: Add an unreg_all() callback to trigger commands
> > tracing: Add lock-free tracing_map
> > tracing: Add 'hist' event trigger command
> > tracing: Add hist trigger support for multiple values ('vals=' param)
> > tracing: Add hist trigger support for compound keys
> > tracing: Add hist trigger support for user-defined sorting ('sort='
> > param)
> > tracing: Add hist trigger support for pausing and continuing a trace
> > tracing: Add hist trigger support for clearing a trace
> > tracing: Add hist trigger 'hex' modifier for displaying numeric fields
> > tracing: Add hist trigger 'sym' and 'sym-offset' modifiers
> > tracing: Add hist trigger 'execname' modifier
> > tracing: Add hist trigger 'syscall' modifier
> > tracing: Add hist trigger support for stacktraces as keys
> > tracing: Remove restriction on string position in hist trigger keys
> > tracing: Add enable_hist/disable_hist triggers
> > tracing: Add 'hist' trigger Documentation
> > tracing: Add support for multiple hist triggers per event
> > tracing: Add support for named triggers
> > tracing: Add support for named hist triggers
> >
> > Documentation/trace/events.txt | 1555 ++++++++++++++++++
> > include/linux/trace_events.h | 9 +-
> > kernel/trace/Kconfig | 27 +
> > kernel/trace/Makefile | 2 +
> > kernel/trace/trace.c | 57 +
> > kernel/trace/trace.h | 106 +-
> > kernel/trace/trace_events.c | 4 +
> > kernel/trace/trace_events_filter.c | 12 -
> > kernel/trace/trace_events_hist.c | 1731 ++++++++++++++++++++
> > kernel/trace/trace_events_trigger.c | 309 +++-
> > kernel/trace/trace_syscalls.c | 11 +
> > kernel/trace/tracing_map.c | 1058 ++++++++++++
> > kernel/trace/tracing_map.h | 282 ++++
> > tools/testing/selftests/ftrace/test.d/functions | 9 +
> > .../ftrace/test.d/trigger/trigger-eventonoff.tc | 64 +
> > .../ftrace/test.d/trigger/trigger-filter.tc | 59 +
> > .../ftrace/test.d/trigger/trigger-hist-mod.tc | 65 +
> > .../ftrace/test.d/trigger/trigger-hist.tc | 83 +
> > .../ftrace/test.d/trigger/trigger-multihist.tc | 73 +
> > .../ftrace/test.d/trigger/trigger-snapshot.tc | 56 +
> > .../ftrace/test.d/trigger/trigger-stacktrace.tc | 53 +
> > .../ftrace/test.d/trigger/trigger-traceonoff.tc | 58 +
> > 22 files changed, 5596 insertions(+), 87 deletions(-)
> > create mode 100644 kernel/trace/trace_events_hist.c
> > create mode 100644 kernel/trace/tracing_map.c
> > create mode 100644 kernel/trace/tracing_map.h
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-eventonoff.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-filter.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist-mod.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-hist.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-multihist.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-snapshot.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-stacktrace.tc
> > create mode 100644 tools/testing/selftests/ftrace/test.d/trigger/trigger-traceonoff.tc
> >
> > --
> > 1.9.3
> >