Based on previous discussion, perf needs to support only two types
of ringbuffer: read-write + forward, readonly + backward. This patchset
completly removes the concept of 'overwrite' from code level, controls
mapping permission using write_backward instead.
Wang Nan (7):
perf mmap: Fix perf backward recording
perf tests: Set evlist of test__backward_ring_buffer() to !overwrite
perf tests: Set evlist of test__sw_clock_freq() to !overwrite
perf tests: Set evlist of test__basic_mmap() to !overwrite
perf tests: Set evlist of test__task_exit() to !overwrite
perf tools: Remove 'overwrite' concept from code level
perf tools: Remove prot field in mmap param
tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +-
tools/perf/builtin-kvm.c | 2 +-
tools/perf/builtin-record.c | 4 ++--
tools/perf/builtin-top.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/tests/backward-ring-buffer.c | 2 +-
tools/perf/tests/bpf.c | 2 +-
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/keep-tracking.c | 2 +-
tools/perf/tests/mmap-basic.c | 2 +-
tools/perf/tests/openat-syscall-tp-fields.c | 2 +-
tools/perf/tests/perf-record.c | 2 +-
tools/perf/tests/sw-clock.c | 2 +-
tools/perf/tests/switch-tracking.c | 2 +-
tools/perf/tests/task-exit.c | 2 +-
tools/perf/util/evlist.c | 21 ++++++++++-----------
tools/perf/util/evlist.h | 6 ++----
tools/perf/util/mmap.c | 10 +++++-----
tools/perf/util/mmap.h | 6 +++---
tools/perf/util/python.c | 10 +++++-----
20 files changed, 41 insertions(+), 44 deletions(-)
--
2.10.1
From 1583979760931364200@xxx Mon Nov 13 19:20:15 +0000 2017
X-GM-THRID: 1583741173726786214
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread
After removing the concept of 'overwrite' in code level, now the
prot is determinated by write_backward. There's no need to pass
prot from perf_evlist__mmap_ex().
Signed-off-by: Wang Nan <[email protected]>
---
tools/perf/util/evlist.c | 17 ++++++-----------
tools/perf/util/mmap.c | 4 ++--
tools/perf/util/mmap.h | 4 ++--
3 files changed, 10 insertions(+), 15 deletions(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 4948d3d..0d713e0 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -799,28 +799,23 @@ perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
}
static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
- struct mmap_params *_mp, int cpu_idx,
+ struct mmap_params *mp, int cpu_idx,
int thread, int *_output, int *_output_backward)
{
struct perf_evsel *evsel;
int revent;
int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
- struct mmap_params *mp;
evlist__for_each_entry(evlist, evsel) {
struct perf_mmap *maps = evlist->mmap;
- struct mmap_params rdonly_mp;
int *output = _output;
int fd;
int cpu;
+ int prot = PROT_READ;
- mp = _mp;
if (evsel->attr.write_backward) {
output = _output_backward;
maps = evlist->backward_mmap;
- rdonly_mp = *_mp;
- rdonly_mp.prot &= ~PROT_WRITE;
- mp = &rdonly_mp;
if (!maps) {
maps = perf_evlist__alloc_mmap(evlist);
@@ -830,6 +825,8 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
if (evlist->bkw_mmap_state == BKW_MMAP_NOTREADY)
perf_evlist__toggle_bkw_mmap(evlist, BKW_MMAP_RUNNING);
}
+ } else {
+ prot |= PROT_WRITE;
}
if (evsel->system_wide && thread)
@@ -844,7 +841,7 @@ static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
if (*output == -1) {
*output = fd;
- if (perf_mmap__mmap(&maps[idx], mp, *output) < 0)
+ if (perf_mmap__mmap(&maps[idx], mp, prot, *output) < 0)
return -1;
} else {
if (ioctl(fd, PERF_EVENT_IOC_SET_OUTPUT, *output) != 0)
@@ -1064,9 +1061,7 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
struct perf_evsel *evsel;
const struct cpu_map *cpus = evlist->cpus;
const struct thread_map *threads = evlist->threads;
- struct mmap_params mp = {
- .prot = PROT_READ | PROT_WRITE,
- };
+ struct mmap_params mp;
if (!evlist->mmap)
evlist->mmap = perf_evlist__alloc_mmap(evlist);
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 703ed41..40e91a0 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -219,7 +219,7 @@ void perf_mmap__munmap(struct perf_mmap *map)
auxtrace_mmap__munmap(&map->auxtrace_mmap);
}
-int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd)
+int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int prot, int fd)
{
/*
* The last one will be done at perf_evlist__mmap_consume(), so that we
@@ -237,7 +237,7 @@ int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd)
refcount_set(&map->refcnt, 2);
map->prev = 0;
map->mask = mp->mask;
- map->base = mmap(NULL, perf_mmap__mmap_len(map), mp->prot,
+ map->base = mmap(NULL, perf_mmap__mmap_len(map), prot,
MAP_SHARED, fd, 0);
if (map->base == MAP_FAILED) {
pr_debug2("failed to mmap perf event ring buffer, error %d\n",
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index 2c3d291..1f6fcc6 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -53,11 +53,11 @@ enum bkw_mmap_state {
};
struct mmap_params {
- int prot, mask;
+ int mask;
struct auxtrace_mmap_params auxtrace_mp;
};
-int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int fd);
+int perf_mmap__mmap(struct perf_mmap *map, struct mmap_params *mp, int prot, int fd);
void perf_mmap__munmap(struct perf_mmap *map);
void perf_mmap__get(struct perf_mmap *map);
--
2.10.1
From 1583956779681302854@xxx Mon Nov 13 13:14:59 +0000 2017
X-GM-THRID: 1583956186816462516
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread
perf record backward recording doesn't work as we expected: it never
overwrite when ring buffer full.
Test:
(Run a busy printing task background like this:
while True:
print 123
send SIGUSR2 to perf to capture snapshot.)
# ./perf record --overwrite -e raw_syscalls:sys_enter -e raw_syscalls:sys_exit --exclude-perf -a --switch-output
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101520743 ]
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101521251 ]
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101521692 ]
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Dump perf.data.2017110101521936 ]
[ perf record: Captured and wrote 0.826 MB perf.data.<timestamp> ]
# ./perf script -i ./perf.data.2017110101520743 | head -n3
perf 2717 [000] 12449.310785: raw_syscalls:sys_enter: NR 16 (5, 2400, 0, 59, 100, 0)
perf 2717 [000] 12449.310790: raw_syscalls:sys_enter: NR 7 (4112340, 2, ffffffff, 3df, 100, 0)
python 2545 [000] 12449.310800: raw_syscalls:sys_exit: NR 1 = 4
# ./perf script -i ./perf.data.2017110101521251 | head -n3
perf 2717 [000] 12449.310785: raw_syscalls:sys_enter: NR 16 (5, 2400, 0, 59, 100, 0)
perf 2717 [000] 12449.310790: raw_syscalls:sys_enter: NR 7 (4112340, 2, ffffffff, 3df, 100, 0)
python 2545 [000] 12449.310800: raw_syscalls:sys_exit: NR 1 = 4
# ./perf script -i ./perf.data.2017110101521692 | head -n3
perf 2717 [000] 12449.310785: raw_syscalls:sys_enter: NR 16 (5, 2400, 0, 59, 100, 0)
perf 2717 [000] 12449.310790: raw_syscalls:sys_enter: NR 7 (4112340, 2, ffffffff, 3df, 100, 0)
python 2545 [000] 12449.310800: raw_syscalls:sys_exit: NR 1 = 4
Timestamps are never change, but my background task is a dead loop, can
easily overwhelme the ring buffer.
This patch fix it by force unsetting PROT_WRITE for backward ring
buffer, so all backward ring buffer become overwrite ring buffer.
Test result:
# ./perf record --overwrite -e raw_syscalls:sys_enter -e raw_syscalls:sys_exit --exclude-perf -a --switch-output
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101285323 ]
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101290053 ]
[ perf record: dump data: Woken up 1 times ]
[ perf record: Dump perf.data.2017110101290446 ]
^C[ perf record: Woken up 1 times to write data ]
[ perf record: Dump perf.data.2017110101290837 ]
[ perf record: Captured and wrote 0.826 MB perf.data.<timestamp> ]
# ./perf script -i ./perf.data.2017110101285323 | head -n3
python 2545 [000] 11064.268083: raw_syscalls:sys_exit: NR 1 = 4
python 2545 [000] 11064.268084: raw_syscalls:sys_enter: NR 1 (1, 12cc330, 4, 7fc237280370, 7fc2373d0700, 2c7b0)
python 2545 [000] 11064.268086: raw_syscalls:sys_exit: NR 1 = 4
# ./perf script -i ./perf.data.2017110101290 | head -n3
failed to open ./perf.data.2017110101290: No such file or directory
# ./perf script -i ./perf.data.2017110101290053 | head -n3
python 2545 [000] 11071.564062: raw_syscalls:sys_enter: NR 1 (1, 12cc330, 4, 7fc237280370, 7fc2373d0700, 2c7b0)
python 2545 [000] 11071.564064: raw_syscalls:sys_exit: NR 1 = 4
python 2545 [000] 11071.564066: raw_syscalls:sys_enter: NR 1 (1, 12cc330, 4, 7fc237280370, 7fc2373d0700, 2c7b0)
# ./perf script -i ./perf.data.2017110101290 | head -n3
perf.data.2017110101290053 perf.data.2017110101290446 perf.data.2017110101290837
# ./perf script -i ./perf.data.2017110101290446 | head -n3
sshd 1321 [000] 11075.499473: raw_syscalls:sys_exit: NR 14 = 0
sshd 1321 [000] 11075.499474: raw_syscalls:sys_enter: NR 14 (2, 7ffe98899490, 0, 8, 0, 3000)
sshd 1321 [000] 11075.499474: raw_syscalls:sys_exit: NR 14 = 0
# ./perf script -i ./perf.data.2017110101290837 | head -n3
python 2545 [000] 11079.280844: raw_syscalls:sys_exit: NR 1 = 4
python 2545 [000] 11079.280847: raw_syscalls:sys_enter: NR 1 (1, 12cc330, 4, 7fc237280370, 7fc2373d0700, 2c7b0)
python 2545 [000] 11079.280850: raw_syscalls:sys_exit: NR 1 = 4
Signed-off-by: Wang Nan <[email protected]>
---
tools/perf/util/evlist.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index c6c891e..4c5daba 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -799,22 +799,28 @@ perf_evlist__should_poll(struct perf_evlist *evlist __maybe_unused,
}
static int perf_evlist__mmap_per_evsel(struct perf_evlist *evlist, int idx,
- struct mmap_params *mp, int cpu_idx,
+ struct mmap_params *_mp, int cpu_idx,
int thread, int *_output, int *_output_backward)
{
struct perf_evsel *evsel;
int revent;
int evlist_cpu = cpu_map__cpu(evlist->cpus, cpu_idx);
+ struct mmap_params *mp;
evlist__for_each_entry(evlist, evsel) {
struct perf_mmap *maps = evlist->mmap;
+ struct mmap_params rdonly_mp;
int *output = _output;
int fd;
int cpu;
+ mp = _mp;
if (evsel->attr.write_backward) {
output = _output_backward;
maps = evlist->backward_mmap;
+ rdonly_mp = *_mp;
+ rdonly_mp.prot &= ~PROT_WRITE;
+ mp = &rdonly_mp;
if (!maps) {
maps = perf_evlist__alloc_mmap(evlist);
--
2.10.1
From 1583901508312210152@xxx Sun Nov 12 22:36:28 +0000 2017
X-GM-THRID: 1583901508312210152
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread
Since all 'overwrite' usage are cleaned and no one really use a readonly main
ringbuffer, remove 'overwrite' from function arguments and evlist. The concept
of 'overwrite' and 'write_backward' are cleanner than before:
1. In code level, there's no 'overwrite' concept. Each evlist has two
ringbuffer groups. One is read-write/forward, another is readonly/backward.
Don't support read-write/backward and readonly/forward.
2. In user interface, we keep '--overwrite' and translate it into write_backward
in each event.
Signed-off-by: Wang Nan <[email protected]>
---
tools/perf/arch/x86/tests/perf-time-to-tsc.c | 2 +-
tools/perf/builtin-kvm.c | 2 +-
tools/perf/builtin-record.c | 4 ++--
tools/perf/builtin-top.c | 2 +-
tools/perf/builtin-trace.c | 2 +-
tools/perf/tests/backward-ring-buffer.c | 2 +-
tools/perf/tests/bpf.c | 2 +-
tools/perf/tests/code-reading.c | 2 +-
tools/perf/tests/keep-tracking.c | 2 +-
tools/perf/tests/mmap-basic.c | 2 +-
tools/perf/tests/openat-syscall-tp-fields.c | 2 +-
tools/perf/tests/perf-record.c | 2 +-
tools/perf/tests/sw-clock.c | 2 +-
tools/perf/tests/switch-tracking.c | 2 +-
tools/perf/tests/task-exit.c | 2 +-
tools/perf/util/evlist.c | 14 ++++++--------
tools/perf/util/evlist.h | 6 ++----
tools/perf/util/mmap.c | 6 +++---
tools/perf/util/mmap.h | 2 +-
tools/perf/util/python.c | 10 +++++-----
20 files changed, 33 insertions(+), 37 deletions(-)
diff --git a/tools/perf/arch/x86/tests/perf-time-to-tsc.c b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
index 5dd7efb..c7ea843 100644
--- a/tools/perf/arch/x86/tests/perf-time-to-tsc.c
+++ b/tools/perf/arch/x86/tests/perf-time-to-tsc.c
@@ -83,7 +83,7 @@ int test__perf_time_to_tsc(struct test *test __maybe_unused, int subtest __maybe
CHECK__(perf_evlist__open(evlist));
- CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
+ CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
pc = evlist->mmap[0].base;
ret = perf_read_tsc_conversion(pc, &tc);
diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c
index 0af4c09..e3e2a80 100644
--- a/tools/perf/builtin-kvm.c
+++ b/tools/perf/builtin-kvm.c
@@ -1043,7 +1043,7 @@ static int kvm_live_open_events(struct perf_kvm_stat *kvm)
goto out;
}
- if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages, false) < 0) {
+ if (perf_evlist__mmap(evlist, kvm->opts.mmap_pages) < 0) {
ui__error("Failed to mmap the events: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
perf_evlist__close(evlist);
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index f4d9fc5..b3ef33f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -300,7 +300,7 @@ static int record__mmap_evlist(struct record *rec,
struct record_opts *opts = &rec->opts;
char msg[512];
- if (perf_evlist__mmap_ex(evlist, opts->mmap_pages, false,
+ if (perf_evlist__mmap_ex(evlist, opts->mmap_pages,
opts->auxtrace_mmap_pages,
opts->auxtrace_snapshot_mode) < 0) {
if (errno == EPERM) {
@@ -481,7 +481,7 @@ static int record__mmap_read_evlist(struct record *rec, struct perf_evlist *evli
struct auxtrace_mmap *mm = &maps[i].auxtrace_mmap;
if (maps[i].base) {
- if (perf_mmap__push(&maps[i], evlist->overwrite, backward, rec, record__pushfn) != 0) {
+ if (perf_mmap__push(&maps[i], backward, rec, record__pushfn) != 0) {
rc = -1;
goto out;
}
diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index 477a869..83d2ae2 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -902,7 +902,7 @@ static int perf_top__start_counters(struct perf_top *top)
}
}
- if (perf_evlist__mmap(evlist, opts->mmap_pages, false) < 0) {
+ if (perf_evlist__mmap(evlist, opts->mmap_pages) < 0) {
ui__error("Failed to mmap with %d (%s)\n",
errno, str_error_r(errno, msg, sizeof(msg)));
goto out_err;
diff --git a/tools/perf/builtin-trace.c b/tools/perf/builtin-trace.c
index c373f9a..c3f2f98 100644
--- a/tools/perf/builtin-trace.c
+++ b/tools/perf/builtin-trace.c
@@ -2404,7 +2404,7 @@ static int trace__run(struct trace *trace, int argc, const char **argv)
if (err < 0)
goto out_error_apply_filters;
- err = perf_evlist__mmap(evlist, trace->opts.mmap_pages, false);
+ err = perf_evlist__mmap(evlist, trace->opts.mmap_pages);
if (err < 0)
goto out_error_mmap;
diff --git a/tools/perf/tests/backward-ring-buffer.c b/tools/perf/tests/backward-ring-buffer.c
index 992c917..bdebcf9 100644
--- a/tools/perf/tests/backward-ring-buffer.c
+++ b/tools/perf/tests/backward-ring-buffer.c
@@ -58,7 +58,7 @@ static int do_test(struct perf_evlist *evlist, int mmap_pages,
int err;
char sbuf[STRERR_BUFSIZE];
- err = perf_evlist__mmap(evlist, mmap_pages, false);
+ err = perf_evlist__mmap(evlist, mmap_pages);
if (err < 0) {
pr_debug("perf_evlist__mmap: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
diff --git a/tools/perf/tests/bpf.c b/tools/perf/tests/bpf.c
index 34c22cd..c433dd3 100644
--- a/tools/perf/tests/bpf.c
+++ b/tools/perf/tests/bpf.c
@@ -167,7 +167,7 @@ static int do_test(struct bpf_object *obj, int (*func)(void),
goto out_delete_evlist;
}
- err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
+ err = perf_evlist__mmap(evlist, opts.mmap_pages);
if (err < 0) {
pr_debug("perf_evlist__mmap: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
diff --git a/tools/perf/tests/code-reading.c b/tools/perf/tests/code-reading.c
index 466a462..b6c813e 100644
--- a/tools/perf/tests/code-reading.c
+++ b/tools/perf/tests/code-reading.c
@@ -638,7 +638,7 @@ static int do_test_code_reading(bool try_kcore)
break;
}
- ret = perf_evlist__mmap(evlist, UINT_MAX, false);
+ ret = perf_evlist__mmap(evlist, UINT_MAX);
if (ret < 0) {
pr_debug("perf_evlist__mmap failed\n");
goto out_put;
diff --git a/tools/perf/tests/keep-tracking.c b/tools/perf/tests/keep-tracking.c
index 7394286..b282916 100644
--- a/tools/perf/tests/keep-tracking.c
+++ b/tools/perf/tests/keep-tracking.c
@@ -94,7 +94,7 @@ int test__keep_tracking(struct test *test __maybe_unused, int subtest __maybe_un
goto out_err;
}
- CHECK__(perf_evlist__mmap(evlist, UINT_MAX, false));
+ CHECK__(perf_evlist__mmap(evlist, UINT_MAX));
/*
* First, test that a 'comm' event can be found when the event is
diff --git a/tools/perf/tests/mmap-basic.c b/tools/perf/tests/mmap-basic.c
index 667d696..f43d862 100644
--- a/tools/perf/tests/mmap-basic.c
+++ b/tools/perf/tests/mmap-basic.c
@@ -93,7 +93,7 @@ int test__basic_mmap(struct test *test __maybe_unused, int subtest __maybe_unuse
expected_nr_events[i] = 1 + rand() % 127;
}
- if (perf_evlist__mmap(evlist, 128, false) < 0) {
+ if (perf_evlist__mmap(evlist, 128) < 0) {
pr_debug("failed to mmap events: %d (%s)\n", errno,
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_delete_evlist;
diff --git a/tools/perf/tests/openat-syscall-tp-fields.c b/tools/perf/tests/openat-syscall-tp-fields.c
index b6ee1c4..f68d818 100644
--- a/tools/perf/tests/openat-syscall-tp-fields.c
+++ b/tools/perf/tests/openat-syscall-tp-fields.c
@@ -63,7 +63,7 @@ int test__syscall_openat_tp_fields(struct test *test __maybe_unused, int subtest
goto out_delete_evlist;
}
- err = perf_evlist__mmap(evlist, UINT_MAX, false);
+ err = perf_evlist__mmap(evlist, UINT_MAX);
if (err < 0) {
pr_debug("perf_evlist__mmap: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
diff --git a/tools/perf/tests/perf-record.c b/tools/perf/tests/perf-record.c
index 19b6500..f9fbd8b 100644
--- a/tools/perf/tests/perf-record.c
+++ b/tools/perf/tests/perf-record.c
@@ -140,7 +140,7 @@ int test__PERF_RECORD(struct test *test __maybe_unused, int subtest __maybe_unus
* fds in the same CPU to be injected in the same mmap ring buffer
* (using ioctl(PERF_EVENT_IOC_SET_OUTPUT)).
*/
- err = perf_evlist__mmap(evlist, opts.mmap_pages, false);
+ err = perf_evlist__mmap(evlist, opts.mmap_pages);
if (err < 0) {
pr_debug("perf_evlist__mmap: %s\n",
str_error_r(errno, sbuf, sizeof(sbuf)));
diff --git a/tools/perf/tests/sw-clock.c b/tools/perf/tests/sw-clock.c
index c468e6c..fd01b24 100644
--- a/tools/perf/tests/sw-clock.c
+++ b/tools/perf/tests/sw-clock.c
@@ -77,7 +77,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
goto out_delete_evlist;
}
- err = perf_evlist__mmap(evlist, 128, false);
+ err = perf_evlist__mmap(evlist, 128);
if (err < 0) {
pr_debug("failed to mmap event: %d (%s)\n", errno,
str_error_r(errno, sbuf, sizeof(sbuf)));
diff --git a/tools/perf/tests/switch-tracking.c b/tools/perf/tests/switch-tracking.c
index 2acd785..9fee2a0 100644
--- a/tools/perf/tests/switch-tracking.c
+++ b/tools/perf/tests/switch-tracking.c
@@ -448,7 +448,7 @@ int test__switch_tracking(struct test *test __maybe_unused, int subtest __maybe_
goto out;
}
- err = perf_evlist__mmap(evlist, UINT_MAX, false);
+ err = perf_evlist__mmap(evlist, UINT_MAX);
if (err) {
pr_debug("perf_evlist__mmap failed!\n");
goto out_err;
diff --git a/tools/perf/tests/task-exit.c b/tools/perf/tests/task-exit.c
index 4fb6609..4ba5a27 100644
--- a/tools/perf/tests/task-exit.c
+++ b/tools/perf/tests/task-exit.c
@@ -96,7 +96,7 @@ int test__task_exit(struct test *test __maybe_unused, int subtest __maybe_unused
goto out_delete_evlist;
}
- if (perf_evlist__mmap(evlist, 128, false) < 0) {
+ if (perf_evlist__mmap(evlist, 128) < 0) {
pr_debug("failed to mmap events: %d (%s)\n", errno,
str_error_r(errno, sbuf, sizeof(sbuf)));
goto out_delete_evlist;
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 4c5daba..4948d3d 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -711,7 +711,7 @@ union perf_event *perf_evlist__mmap_read_forward(struct perf_evlist *evlist, int
* No need for read-write ring buffer: kernel stop outputting when
* it hit md->prev (perf_mmap__consume()).
*/
- return perf_mmap__read_forward(md, evlist->overwrite);
+ return perf_mmap__read_forward(md, false);
}
union perf_event *perf_evlist__mmap_read_backward(struct perf_evlist *evlist, int idx)
@@ -738,7 +738,7 @@ void perf_evlist__mmap_read_catchup(struct perf_evlist *evlist, int idx)
void perf_evlist__mmap_consume(struct perf_evlist *evlist, int idx)
{
- perf_mmap__consume(&evlist->mmap[idx], evlist->overwrite);
+ perf_mmap__consume(&evlist->mmap[idx], false);
}
static void perf_evlist__munmap_nofree(struct perf_evlist *evlist)
@@ -1058,14 +1058,14 @@ int perf_evlist__parse_mmap_pages(const struct option *opt, const char *str,
* Return: %0 on success, negative error code otherwise.
*/
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
- bool overwrite, unsigned int auxtrace_pages,
+ unsigned int auxtrace_pages,
bool auxtrace_overwrite)
{
struct perf_evsel *evsel;
const struct cpu_map *cpus = evlist->cpus;
const struct thread_map *threads = evlist->threads;
struct mmap_params mp = {
- .prot = PROT_READ | (overwrite ? 0 : PROT_WRITE),
+ .prot = PROT_READ | PROT_WRITE,
};
if (!evlist->mmap)
@@ -1076,7 +1076,6 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
if (evlist->pollfd.entries == NULL && perf_evlist__alloc_pollfd(evlist) < 0)
return -ENOMEM;
- evlist->overwrite = overwrite;
evlist->mmap_len = perf_evlist__mmap_size(pages);
pr_debug("mmap size %zuB\n", evlist->mmap_len);
mp.mask = evlist->mmap_len - page_size - 1;
@@ -1097,10 +1096,9 @@ int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
return perf_evlist__mmap_per_cpu(evlist, &mp);
}
-int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
- bool overwrite)
+int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages)
{
- return perf_evlist__mmap_ex(evlist, pages, overwrite, 0, false);
+ return perf_evlist__mmap_ex(evlist, pages, 0, false);
}
int perf_evlist__create_maps(struct perf_evlist *evlist, struct target *target)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 8c433e9..1dd3291 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -30,7 +30,6 @@ struct perf_evlist {
int nr_entries;
int nr_groups;
int nr_mmaps;
- bool overwrite;
bool enabled;
bool has_user_cpus;
size_t mmap_len;
@@ -168,10 +167,9 @@ int perf_evlist__parse_mmap_pages(const struct option *opt,
unsigned long perf_event_mlock_kb_in_pages(void);
int perf_evlist__mmap_ex(struct perf_evlist *evlist, unsigned int pages,
- bool overwrite, unsigned int auxtrace_pages,
+ unsigned int auxtrace_pages,
bool auxtrace_overwrite);
-int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages,
- bool overwrite);
+int perf_evlist__mmap(struct perf_evlist *evlist, unsigned int pages);
void perf_evlist__munmap(struct perf_evlist *evlist);
size_t perf_evlist__mmap_size(unsigned long pages);
diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
index 9fe5f9c..703ed41 100644
--- a/tools/perf/util/mmap.c
+++ b/tools/perf/util/mmap.c
@@ -299,7 +299,7 @@ static int rb_find_range(void *data, int mask, u64 head, u64 old,
return backward_rb_find_range(data, mask, head, start, end);
}
-int perf_mmap__push(struct perf_mmap *md, bool overwrite, bool backward,
+int perf_mmap__push(struct perf_mmap *md, bool backward,
void *to, int push(void *to, void *buf, size_t size))
{
u64 head = perf_mmap__read_head(md);
@@ -321,7 +321,7 @@ int perf_mmap__push(struct perf_mmap *md, bool overwrite, bool backward,
WARN_ONCE(1, "failed to keep up with mmap data. (warn only once)\n");
md->prev = head;
- perf_mmap__consume(md, overwrite || backward);
+ perf_mmap__consume(md, backward);
return 0;
}
@@ -346,7 +346,7 @@ int perf_mmap__push(struct perf_mmap *md, bool overwrite, bool backward,
}
md->prev = head;
- perf_mmap__consume(md, overwrite || backward);
+ perf_mmap__consume(md, backward);
out:
return rc;
}
diff --git a/tools/perf/util/mmap.h b/tools/perf/util/mmap.h
index efd78b8..2c3d291 100644
--- a/tools/perf/util/mmap.h
+++ b/tools/perf/util/mmap.h
@@ -89,7 +89,7 @@ static inline void perf_mmap__write_tail(struct perf_mmap *md, u64 tail)
union perf_event *perf_mmap__read_forward(struct perf_mmap *map, bool check_messup);
union perf_event *perf_mmap__read_backward(struct perf_mmap *map);
-int perf_mmap__push(struct perf_mmap *md, bool overwrite, bool backward,
+int perf_mmap__push(struct perf_mmap *md, bool backward,
void *to, int push(void *to, void *buf, size_t size));
size_t perf_mmap__mmap_len(struct perf_mmap *map);
diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index c129e99..ece33b4 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -856,14 +856,14 @@ static PyObject *pyrf_evlist__mmap(struct pyrf_evlist *pevlist,
PyObject *args, PyObject *kwargs)
{
struct perf_evlist *evlist = &pevlist->evlist;
- static char *kwlist[] = { "pages", "overwrite", NULL };
- int pages = 128, overwrite = false;
+ static char *kwlist[] = { "pages", NULL };
+ int pages = 128;
- if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|ii", kwlist,
- &pages, &overwrite))
+ if (!PyArg_ParseTupleAndKeywords(args, kwargs, "|i", kwlist,
+ &pages))
return NULL;
- if (perf_evlist__mmap(evlist, pages, overwrite) < 0) {
+ if (perf_evlist__mmap(evlist, pages) < 0) {
PyErr_SetFromErrno(PyExc_OSError);
return NULL;
}
--
2.10.1
From 1583702968135881712@xxx Fri Nov 10 18:00:45 +0000 2017
X-GM-THRID: 1583682358674608028
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread
Unsetting overwrite when calling perf_evlist__mmap is harmless. This commit
passes false to it, makes following commits eliminate the overwrite argument
easier.
Signed-off-by: Wang Nan <[email protected]>
---
tools/perf/tests/sw-clock.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/perf/tests/sw-clock.c b/tools/perf/tests/sw-clock.c
index d88511f..c468e6c 100644
--- a/tools/perf/tests/sw-clock.c
+++ b/tools/perf/tests/sw-clock.c
@@ -77,7 +77,7 @@ static int __test__sw_clock_freq(enum perf_sw_ids clock_id)
goto out_delete_evlist;
}
- err = perf_evlist__mmap(evlist, 128, true);
+ err = perf_evlist__mmap(evlist, 128, false);
if (err < 0) {
pr_debug("failed to mmap event: %d (%s)\n", errno,
str_error_r(errno, sbuf, sizeof(sbuf)));
--
2.10.1
From 1582941150438248779@xxx Thu Nov 02 08:11:59 +0000 2017
X-GM-THRID: 1582941150438248779
X-Gmail-Labels: Inbox,Category Forums,HistoricalUnread