Adding new control events to display all evlist events.
The interface string for control file is 'evlist' and
'evlist-verbose'.
When evlist is received, perf will scan and print current
evlist into perf record terminal.
When evlist-verbose is received perf will scan and print
current evlist details (like perf evlist -v) into perf
record terminal.
Example session:
terminal 1:
# mkfifo control ack perf.pipe
# perf record --control=fifo:control,ack -e 'sched:*'
terminal 2:
# echo evlist > control
terminal 1:
# perf record --control=fifo:control,ack -e 'sched:*'
...
sched:sched_kthread_stop
sched:sched_kthread_stop_ret
sched:sched_waking
sched:sched_wakeup
sched:sched_wakeup_new
sched:sched_switch
sched:sched_migrate_task
sched:sched_process_free
sched:sched_process_exit
...
terminal 2:
# echo evlist-vebose > control
terminal 1:
...
sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
{ sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
1, sample_id_all: 1, exclude_guest: 1
sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
sample_id_all: 1, exclude_guest: 1
...
This new evlist command is handy to get real event names when
wildcards are used.
The evlist-verbose is handy to check on actually enabled perf_event_attr
values.
Signed-off-by: Jiri Olsa <[email protected]>
---
tools/perf/builtin-record.c | 2 ++
tools/perf/builtin-stat.c | 2 ++
tools/perf/util/evlist.c | 15 +++++++++++++++
tools/perf/util/evlist.h | 4 ++++
4 files changed, 23 insertions(+)
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 582b8fba012c..d40406880722 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1951,6 +1951,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
case EVLIST_CTL_CMD_UNSUPPORTED:
case EVLIST_CTL_CMD_ENABLE_EVSEL:
case EVLIST_CTL_CMD_DISABLE_EVSEL:
+ case EVLIST_CTL_CMD_EVLIST:
+ case EVLIST_CTL_CMD_EVLIST_VERBOSE:
default:
break;
}
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 6a21fb665008..425e2a8ebde6 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -592,6 +592,8 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
case EVLIST_CTL_CMD_UNSUPPORTED:
case EVLIST_CTL_CMD_ENABLE_EVSEL:
case EVLIST_CTL_CMD_DISABLE_EVSEL:
+ case EVLIST_CTL_CMD_EVLIST:
+ case EVLIST_CTL_CMD_EVLIST_VERBOSE:
default:
break;
}
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 729c98d10628..571d2ad61f4a 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -24,6 +24,7 @@
#include "bpf-event.h"
#include "util/string2.h"
#include "util/perf_api_probe.h"
+#include "util/evsel_fprintf.h"
#include <signal.h>
#include <unistd.h>
#include <sched.h>
@@ -1931,6 +1932,12 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
(sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
*cmd = EVLIST_CTL_CMD_SNAPSHOT;
pr_debug("is snapshot\n");
+ } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG,
+ (sizeof(EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG)-1))) {
+ *cmd = EVLIST_CTL_CMD_EVLIST_VERBOSE;
+ } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
+ (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
+ *cmd = EVLIST_CTL_CMD_EVLIST;
}
}
@@ -1954,6 +1961,7 @@ int evlist__ctlfd_ack(struct evlist *evlist)
int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
{
+ struct perf_attr_details details = { .verbose = false, };
int err = 0;
char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
int ctlfd_pos = evlist->ctl_fd.pos;
@@ -1995,6 +2003,13 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
pr_info("failed: can't find '%s' event\n", evsel_name);
}
break;
+ case EVLIST_CTL_CMD_EVLIST_VERBOSE:
+ details.verbose = true;
+ __fallthrough;
+ case EVLIST_CTL_CMD_EVLIST:
+ evlist__for_each_entry(evlist, evsel)
+ evsel__fprintf(evsel, &details, stderr);
+ break;
case EVLIST_CTL_CMD_SNAPSHOT:
break;
case EVLIST_CTL_CMD_ACK:
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index e4e8ff8831a3..7892f084632d 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -332,6 +332,8 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse
#define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
#define EVLIST_CTL_CMD_ENABLE_EVSEL_TAG "enable-"
#define EVLIST_CTL_CMD_DISABLE_EVSEL_TAG "disable-"
+#define EVLIST_CTL_CMD_EVLIST_TAG "evlist"
+#define EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG "evlist-verbose"
#define EVLIST_CTL_CMD_MAX_LEN 64
@@ -343,6 +345,8 @@ enum evlist_ctl_cmd {
EVLIST_CTL_CMD_DISABLE_EVSEL,
EVLIST_CTL_CMD_ACK,
EVLIST_CTL_CMD_SNAPSHOT,
+ EVLIST_CTL_CMD_EVLIST,
+ EVLIST_CTL_CMD_EVLIST_VERBOSE,
};
int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
--
2.26.2
Hi Jiri,
On Fri, Dec 11, 2020 at 5:43 AM Jiri Olsa <[email protected]> wrote:
>
> Adding new control events to display all evlist events.
>
> The interface string for control file is 'evlist' and
> 'evlist-verbose'.
>
> When evlist is received, perf will scan and print current
> evlist into perf record terminal.
>
> When evlist-verbose is received perf will scan and print
> current evlist details (like perf evlist -v) into perf
> record terminal.
>
> Example session:
>
> terminal 1:
> # mkfifo control ack perf.pipe
> # perf record --control=fifo:control,ack -e 'sched:*'
>
> terminal 2:
> # echo evlist > control
>
> terminal 1:
> # perf record --control=fifo:control,ack -e 'sched:*'
> ...
> sched:sched_kthread_stop
> sched:sched_kthread_stop_ret
> sched:sched_waking
> sched:sched_wakeup
> sched:sched_wakeup_new
> sched:sched_switch
> sched:sched_migrate_task
> sched:sched_process_free
> sched:sched_process_exit
> ...
>
> terminal 2:
> # echo evlist-vebose > control
>
> terminal 1:
> ...
> sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
> { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
> 1, sample_id_all: 1, exclude_guest: 1
> sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
> , { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
> sample_id_all: 1, exclude_guest: 1
> ...
>
> This new evlist command is handy to get real event names when
> wildcards are used.
>
> The evlist-verbose is handy to check on actually enabled perf_event_attr
> values.
>
> Signed-off-by: Jiri Olsa <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Thanks,
Namhyung
> ---
> tools/perf/builtin-record.c | 2 ++
> tools/perf/builtin-stat.c | 2 ++
> tools/perf/util/evlist.c | 15 +++++++++++++++
> tools/perf/util/evlist.h | 4 ++++
> 4 files changed, 23 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 582b8fba012c..d40406880722 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1951,6 +1951,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_EVLIST:
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> default:
> break;
> }
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 6a21fb665008..425e2a8ebde6 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -592,6 +592,8 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_EVLIST:
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> default:
> break;
> }
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 729c98d10628..571d2ad61f4a 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -24,6 +24,7 @@
> #include "bpf-event.h"
> #include "util/string2.h"
> #include "util/perf_api_probe.h"
> +#include "util/evsel_fprintf.h"
> #include <signal.h>
> #include <unistd.h>
> #include <sched.h>
> @@ -1931,6 +1932,12 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
> (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
> *cmd = EVLIST_CTL_CMD_SNAPSHOT;
> pr_debug("is snapshot\n");
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG,
> + (sizeof(EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_EVLIST_VERBOSE;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
> + (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_EVLIST;
> }
> }
>
> @@ -1954,6 +1961,7 @@ int evlist__ctlfd_ack(struct evlist *evlist)
>
> int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> {
> + struct perf_attr_details details = { .verbose = false, };
> int err = 0;
> char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
> int ctlfd_pos = evlist->ctl_fd.pos;
> @@ -1995,6 +2003,13 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> pr_info("failed: can't find '%s' event\n", evsel_name);
> }
> break;
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> + details.verbose = true;
> + __fallthrough;
> + case EVLIST_CTL_CMD_EVLIST:
> + evlist__for_each_entry(evlist, evsel)
> + evsel__fprintf(evsel, &details, stderr);
> + break;
> case EVLIST_CTL_CMD_SNAPSHOT:
> break;
> case EVLIST_CTL_CMD_ACK:
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index e4e8ff8831a3..7892f084632d 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -332,6 +332,8 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse
> #define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
> #define EVLIST_CTL_CMD_ENABLE_EVSEL_TAG "enable-"
> #define EVLIST_CTL_CMD_DISABLE_EVSEL_TAG "disable-"
> +#define EVLIST_CTL_CMD_EVLIST_TAG "evlist"
> +#define EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG "evlist-verbose"
>
> #define EVLIST_CTL_CMD_MAX_LEN 64
>
> @@ -343,6 +345,8 @@ enum evlist_ctl_cmd {
> EVLIST_CTL_CMD_DISABLE_EVSEL,
> EVLIST_CTL_CMD_ACK,
> EVLIST_CTL_CMD_SNAPSHOT,
> + EVLIST_CTL_CMD_EVLIST,
> + EVLIST_CTL_CMD_EVLIST_VERBOSE,
> };
>
> int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
> --
> 2.26.2
>
Em Thu, Dec 10, 2020 at 09:43:30PM +0100, Jiri Olsa escreveu:
> Adding new control events to display all evlist events.
>
> The interface string for control file is 'evlist' and
> 'evlist-verbose'.
Can't we pass args to such commands?
Then its just one event, i.e. "evlist", and -v can be passed to it.
i.e.:
The commands would be:
evlist
That produces:
terminal 2:
# echo evlist > control
terminal 1:
# perf record --control=fifo:control,ack -e 'sched:*'
...
sched:sched_kthread_stop
sched:sched_kthread_stop_ret
sched:sched_waking
And 'evlist -v', that produces:
terminal 2:
# echo "evlist -v" > control
terminal 1:
...
sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
{ sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
1, sample_id_all: 1, exclude_guest: 1
sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
, { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
|PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
sample_id_all: 1, exclude_guest: 1
...
I think we could even change things such that we pass a file descriptor
for cmd_evlist to use, passing the argv received from the control file,
etc.
With this in place we could reuse more stuff and allow using this
control file to obtain information such as 'perf report --header-only',
etc.
echo "report --header-only" > control would get us the same thing as
'perf report --header-only' for an existing perf.data file:
# perf report --header-only
# ========
# captured on : Tue Dec 15 12:21:23 2020
# header version : 1
# data offset : 432
# data size : 1648
# feat offset : 2080
# hostname : five
# os release : 5.10.0-rc7+
# perf version : 5.10.rc6.gc56d2601b5d0
# arch : x86_64
# nrcpus online : 24
# nrcpus avail : 24
# cpudesc : AMD Ryzen 9 3900X 12-Core Processor
# cpuid : AuthenticAMD,23,113,0
# total memory : 32884432 kB
# cmdline : /home/acme/bin/perf record ls
# event : name = cycles:u, , id = { 85540, 85541, 85542, 85543, 85544, 85545, 85546, 85547, 85548, 85549, 85550, 85551, 85552, 85553, 85554, 85555, 85556, 85557, 85558, 85559, 85560, 85561, 85562, 85563 }, size = 120, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, read_format = ID, disabled = 1, inherit = 1, exclude_kernel = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, ksymbol = 1, bpf_event = 1
# CPU_TOPOLOGY info available, use -I to display
# NUMA_TOPOLOGY info available, use -I to display
# pmu mappings: amd_df = 8, software = 1, ibs_op = 11, power = 14, ibs_fetch = 10, uprobe = 7, cpu = 4, amd_iommu_0 = 12, breakpoint = 5, amd_l3 = 9, tracepoint = 2, kprobe = 6, msr = 13
# CACHE info available, use -I to display
# time of first sample : 12184.494971
# time of last sample : 12184.495496
# sample duration : 0.525 ms
# MEM_TOPOLOGY info available, use -I to display
# cpu pmu capabilities: max_precise=0
# missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA
# ========
#
I.e. users would discover that using this control file is as easy as
working with perf.data files or with the pipe mode, all the three ways
of interacting with perf would use the same command interface arguments.
- Arnaldo
> When evlist is received, perf will scan and print current
> evlist into perf record terminal.
>
> When evlist-verbose is received perf will scan and print
> current evlist details (like perf evlist -v) into perf
> record terminal.
>
> Example session:
>
> terminal 1:
> # mkfifo control ack perf.pipe
> # perf record --control=fifo:control,ack -e 'sched:*'
>
> terminal 2:
> # echo evlist > control
>
> terminal 1:
> # perf record --control=fifo:control,ack -e 'sched:*'
> ...
> sched:sched_kthread_stop
> sched:sched_kthread_stop_ret
> sched:sched_waking
> sched:sched_wakeup
> sched:sched_wakeup_new
> sched:sched_switch
> sched:sched_migrate_task
> sched:sched_process_free
> sched:sched_process_exit
> ...
>
> terminal 2:
> # echo evlist-vebose > control
>
> terminal 1:
> ...
> sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
> { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
> 1, sample_id_all: 1, exclude_guest: 1
> sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
> , { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
> sample_id_all: 1, exclude_guest: 1
> ...
>
> This new evlist command is handy to get real event names when
> wildcards are used.
>
> The evlist-verbose is handy to check on actually enabled perf_event_attr
> values.
>
> Signed-off-by: Jiri Olsa <[email protected]>
> ---
> tools/perf/builtin-record.c | 2 ++
> tools/perf/builtin-stat.c | 2 ++
> tools/perf/util/evlist.c | 15 +++++++++++++++
> tools/perf/util/evlist.h | 4 ++++
> 4 files changed, 23 insertions(+)
>
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index 582b8fba012c..d40406880722 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -1951,6 +1951,8 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_EVLIST:
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> default:
> break;
> }
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 6a21fb665008..425e2a8ebde6 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -592,6 +592,8 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
> case EVLIST_CTL_CMD_UNSUPPORTED:
> case EVLIST_CTL_CMD_ENABLE_EVSEL:
> case EVLIST_CTL_CMD_DISABLE_EVSEL:
> + case EVLIST_CTL_CMD_EVLIST:
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> default:
> break;
> }
> diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> index 729c98d10628..571d2ad61f4a 100644
> --- a/tools/perf/util/evlist.c
> +++ b/tools/perf/util/evlist.c
> @@ -24,6 +24,7 @@
> #include "bpf-event.h"
> #include "util/string2.h"
> #include "util/perf_api_probe.h"
> +#include "util/evsel_fprintf.h"
> #include <signal.h>
> #include <unistd.h>
> #include <sched.h>
> @@ -1931,6 +1932,12 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd,
> (sizeof(EVLIST_CTL_CMD_SNAPSHOT_TAG)-1))) {
> *cmd = EVLIST_CTL_CMD_SNAPSHOT;
> pr_debug("is snapshot\n");
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG,
> + (sizeof(EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_EVLIST_VERBOSE;
> + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG,
> + (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) {
> + *cmd = EVLIST_CTL_CMD_EVLIST;
> }
> }
>
> @@ -1954,6 +1961,7 @@ int evlist__ctlfd_ack(struct evlist *evlist)
>
> int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> {
> + struct perf_attr_details details = { .verbose = false, };
> int err = 0;
> char cmd_data[EVLIST_CTL_CMD_MAX_LEN];
> int ctlfd_pos = evlist->ctl_fd.pos;
> @@ -1995,6 +2003,13 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd)
> pr_info("failed: can't find '%s' event\n", evsel_name);
> }
> break;
> + case EVLIST_CTL_CMD_EVLIST_VERBOSE:
> + details.verbose = true;
> + __fallthrough;
> + case EVLIST_CTL_CMD_EVLIST:
> + evlist__for_each_entry(evlist, evsel)
> + evsel__fprintf(evsel, &details, stderr);
> + break;
> case EVLIST_CTL_CMD_SNAPSHOT:
> break;
> case EVLIST_CTL_CMD_ACK:
> diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
> index e4e8ff8831a3..7892f084632d 100644
> --- a/tools/perf/util/evlist.h
> +++ b/tools/perf/util/evlist.h
> @@ -332,6 +332,8 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse
> #define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot"
> #define EVLIST_CTL_CMD_ENABLE_EVSEL_TAG "enable-"
> #define EVLIST_CTL_CMD_DISABLE_EVSEL_TAG "disable-"
> +#define EVLIST_CTL_CMD_EVLIST_TAG "evlist"
> +#define EVLIST_CTL_CMD_EVLIST_VERBOSE_TAG "evlist-verbose"
>
> #define EVLIST_CTL_CMD_MAX_LEN 64
>
> @@ -343,6 +345,8 @@ enum evlist_ctl_cmd {
> EVLIST_CTL_CMD_DISABLE_EVSEL,
> EVLIST_CTL_CMD_ACK,
> EVLIST_CTL_CMD_SNAPSHOT,
> + EVLIST_CTL_CMD_EVLIST,
> + EVLIST_CTL_CMD_EVLIST_VERBOSE,
> };
>
> int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close);
> --
> 2.26.2
>
--
- Arnaldo
On Tue, Dec 15, 2020 at 12:23:43PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Thu, Dec 10, 2020 at 09:43:30PM +0100, Jiri Olsa escreveu:
> > Adding new control events to display all evlist events.
> >
> > The interface string for control file is 'evlist' and
> > 'evlist-verbose'.
>
> Can't we pass args to such commands?
>
> Then its just one event, i.e. "evlist", and -v can be passed to it.
it's possible but it adds another processing to the single record thread
where we want to be fast
but I agree it could be helpful to get the other output that evsel__fprintf
can print, and we already call evsel__fprintf, so it's just a matter of
setting 'struct perf_attr_details' properly
I need to check, but perhaps we could use ' ' instead of '-' and have:
echo 'evlist -v' > control
echo 'evlist -g' > control
echo 'evlist -F' > control
and have:
echo 'enable cycles' > control
instead of:
echo 'enable-cycles' > control
I'd like to avoid any elaborate parsing logic..
how about that?
>
> i.e.:
>
> The commands would be:
>
> evlist
>
> That produces:
>
>
> terminal 2:
> # echo evlist > control
>
> terminal 1:
> # perf record --control=fifo:control,ack -e 'sched:*'
> ...
> sched:sched_kthread_stop
> sched:sched_kthread_stop_ret
> sched:sched_waking
>
> And 'evlist -v', that produces:
>
> terminal 2:
> # echo "evlist -v" > control
>
> terminal 1:
> ...
> sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
> { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
> 1, sample_id_all: 1, exclude_guest: 1
> sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
> , { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
> sample_id_all: 1, exclude_guest: 1
> ...
>
> I think we could even change things such that we pass a file descriptor
> for cmd_evlist to use, passing the argv received from the control file,
> etc.
hum, so perf evlist opens/reads perf.data, which we do not have ready
at that point in perf record
>
> With this in place we could reuse more stuff and allow using this
> control file to obtain information such as 'perf report --header-only',
> etc.
>
> echo "report --header-only" > control would get us the same thing as
> 'perf report --header-only' for an existing perf.data file:
all those header data are written when record is exiting or dumped
for switch output, so we don't have that data at that moment control
command is received
>
>
> # perf report --header-only
> # ========
> # captured on : Tue Dec 15 12:21:23 2020
> # header version : 1
> # data offset : 432
> # data size : 1648
> # feat offset : 2080
> # hostname : five
> # os release : 5.10.0-rc7+
> # perf version : 5.10.rc6.gc56d2601b5d0
> # arch : x86_64
> # nrcpus online : 24
> # nrcpus avail : 24
> # cpudesc : AMD Ryzen 9 3900X 12-Core Processor
> # cpuid : AuthenticAMD,23,113,0
> # total memory : 32884432 kB
> # cmdline : /home/acme/bin/perf record ls
> # event : name = cycles:u, , id = { 85540, 85541, 85542, 85543, 85544, 85545, 85546, 85547, 85548, 85549, 85550, 85551, 85552, 85553, 85554, 85555, 85556, 85557, 85558, 85559, 85560, 85561, 85562, 85563 }, size = 120, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, read_format = ID, disabled = 1, inherit = 1, exclude_kernel = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, ksymbol = 1, bpf_event = 1
> # CPU_TOPOLOGY info available, use -I to display
> # NUMA_TOPOLOGY info available, use -I to display
> # pmu mappings: amd_df = 8, software = 1, ibs_op = 11, power = 14, ibs_fetch = 10, uprobe = 7, cpu = 4, amd_iommu_0 = 12, breakpoint = 5, amd_l3 = 9, tracepoint = 2, kprobe = 6, msr = 13
> # CACHE info available, use -I to display
> # time of first sample : 12184.494971
> # time of last sample : 12184.495496
> # sample duration : 0.525 ms
> # MEM_TOPOLOGY info available, use -I to display
> # cpu pmu capabilities: max_precise=0
> # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA
> # ========
> #
>
> I.e. users would discover that using this control file is as easy as
> working with perf.data files or with the pipe mode, all the three ways
> of interacting with perf would use the same command interface arguments.
yep, I agree we can mimic the similar arguments, but I doubt we
can easily reuse the same code for that
jirka
Em Tue, Dec 15, 2020 at 04:59:11PM +0100, Jiri Olsa escreveu:
> On Tue, Dec 15, 2020 at 12:23:43PM -0300, Arnaldo Carvalho de Melo wrote:
> > Em Thu, Dec 10, 2020 at 09:43:30PM +0100, Jiri Olsa escreveu:
> > > Adding new control events to display all evlist events.
> > >
> > > The interface string for control file is 'evlist' and
> > > 'evlist-verbose'.
> >
> > Can't we pass args to such commands?
> >
> > Then its just one event, i.e. "evlist", and -v can be passed to it.
>
> it's possible but it adds another processing to the single record thread
> where we want to be fast
> but I agree it could be helpful to get the other output that evsel__fprintf
> can print, and we already call evsel__fprintf, so it's just a matter of
> setting 'struct perf_attr_details' properly
> I need to check, but perhaps we could use ' ' instead of '-' and have:
>
> echo 'evlist -v' > control
> echo 'evlist -g' > control
> echo 'evlist -F' > control
> and have:
> echo 'enable cycles' > control
> instead of:
> echo 'enable-cycles' > control
> I'd like to avoid any elaborate parsing logic..
> how about that?
Use space to separate command from its arguments, keep the same
experience as:
[acme@quaco ~]$ perf evlist -h
Usage: perf evlist [<options>]
-f, --force don't complain, do it
-F, --freq Show the sample frequency
-g, --group Show event group information
-i, --input <file> Input file name
-v, --verbose Show all event attr details
--trace-fields Show tracepoint fields
[acme@quaco ~]$
and:
echo "evlist arguments"
?
Fits the bill :-)
The experience users have on existing commands, the same arguments, etc.
Even -h can have its uses, i.e. has this daemon support for some option
or is it an old version?
- Arnaldo
> >
> > i.e.:
> >
> > The commands would be:
> >
> > evlist
> >
> > That produces:
> >
> >
> > terminal 2:
> > # echo evlist > control
> >
> > terminal 1:
> > # perf record --control=fifo:control,ack -e 'sched:*'
> > ...
> > sched:sched_kthread_stop
> > sched:sched_kthread_stop_ret
> > sched:sched_waking
> >
> > And 'evlist -v', that produces:
> >
> > terminal 2:
> > # echo "evlist -v" > control
> >
> > terminal 1:
> > ...
> > sched:sched_kthread_stop: type: 2, size: 120, config: 0x145, \
> > { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> > |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: \
> > 1, sample_id_all: 1, exclude_guest: 1
> > sched:sched_kthread_stop_ret: type: 2, size: 120, config: 0x144 \
> > , { sample_period, sample_freq }: 1, sample_type: IP|TID|TIME|CPU \
> > |PERIOD|RAW|IDENTIFIER, read_format: ID, disabled: 1, inherit: 1, \
> > sample_id_all: 1, exclude_guest: 1
> > ...
> >
> > I think we could even change things such that we pass a file descriptor
> > for cmd_evlist to use, passing the argv received from the control file,
> > etc.
>
> hum, so perf evlist opens/reads perf.data, which we do not have ready
> at that point in perf record
>
> >
> > With this in place we could reuse more stuff and allow using this
> > control file to obtain information such as 'perf report --header-only',
> > etc.
> >
> > echo "report --header-only" > control would get us the same thing as
> > 'perf report --header-only' for an existing perf.data file:
>
> all those header data are written when record is exiting or dumped
> for switch output, so we don't have that data at that moment control
> command is received
>
> >
> >
> > # perf report --header-only
> > # ========
> > # captured on : Tue Dec 15 12:21:23 2020
> > # header version : 1
> > # data offset : 432
> > # data size : 1648
> > # feat offset : 2080
> > # hostname : five
> > # os release : 5.10.0-rc7+
> > # perf version : 5.10.rc6.gc56d2601b5d0
> > # arch : x86_64
> > # nrcpus online : 24
> > # nrcpus avail : 24
> > # cpudesc : AMD Ryzen 9 3900X 12-Core Processor
> > # cpuid : AuthenticAMD,23,113,0
> > # total memory : 32884432 kB
> > # cmdline : /home/acme/bin/perf record ls
> > # event : name = cycles:u, , id = { 85540, 85541, 85542, 85543, 85544, 85545, 85546, 85547, 85548, 85549, 85550, 85551, 85552, 85553, 85554, 85555, 85556, 85557, 85558, 85559, 85560, 85561, 85562, 85563 }, size = 120, { sample_period, sample_freq } = 4000, sample_type = IP|TID|TIME|PERIOD, read_format = ID, disabled = 1, inherit = 1, exclude_kernel = 1, mmap = 1, comm = 1, freq = 1, enable_on_exec = 1, task = 1, sample_id_all = 1, exclude_guest = 1, mmap2 = 1, comm_exec = 1, ksymbol = 1, bpf_event = 1
> > # CPU_TOPOLOGY info available, use -I to display
> > # NUMA_TOPOLOGY info available, use -I to display
> > # pmu mappings: amd_df = 8, software = 1, ibs_op = 11, power = 14, ibs_fetch = 10, uprobe = 7, cpu = 4, amd_iommu_0 = 12, breakpoint = 5, amd_l3 = 9, tracepoint = 2, kprobe = 6, msr = 13
> > # CACHE info available, use -I to display
> > # time of first sample : 12184.494971
> > # time of last sample : 12184.495496
> > # sample duration : 0.525 ms
> > # MEM_TOPOLOGY info available, use -I to display
> > # cpu pmu capabilities: max_precise=0
> > # missing features: TRACING_DATA BRANCH_STACK GROUP_DESC AUXTRACE STAT CLOCKID DIR_FORMAT COMPRESSED CLOCK_DATA
> > # ========
> > #
> >
> > I.e. users would discover that using this control file is as easy as
> > working with perf.data files or with the pipe mode, all the three ways
> > of interacting with perf would use the same command interface arguments.
>
> yep, I agree we can mimic the similar arguments, but I doubt we
> can easily reuse the same code for that
>
> jirka
>
--
- Arnaldo
On Tue, Dec 15, 2020 at 01:09:33PM -0300, Arnaldo Carvalho de Melo wrote:
SNIP
> > instead of:
>
> > echo 'enable-cycles' > control
>
> > I'd like to avoid any elaborate parsing logic..
>
> > how about that?
>
> Use space to separate command from its arguments, keep the same
> experience as:
>
> [acme@quaco ~]$ perf evlist -h
>
> Usage: perf evlist [<options>]
>
> -f, --force don't complain, do it
> -F, --freq Show the sample frequency
> -g, --group Show event group information
> -i, --input <file> Input file name
> -v, --verbose Show all event attr details
> --trace-fields Show tracepoint fields
>
> [acme@quaco ~]$
>
> and:
>
> echo "evlist arguments"
>
> ?
>
> Fits the bill :-)
ok
>
> The experience users have on existing commands, the same arguments, etc.
>
> Even -h can have its uses, i.e. has this daemon support for some option
> or is it an old version?
Alexei just suggested to add 'stop' control command and use it
instead of kill signal, which is good idea
but other than that daemon just opens the control file and
shows its path
jirka