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| author | Namhyung Kim <namhyung@kernel.org> | 2022-01-27 01:00:49 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-02-10 19:41:27 +0100 |
| commit | 0d435bf8c3f4d01d9547e87237977191573c6f5a (patch) | |
| tree | 038c22aac8fd605f49b9ec426fe3ad06da979571 /tools/perf/Documentation/perf-lock.txt | |
| parent | perf lock: Fix lock name length check for printing (diff) | |
| download | linux-0d435bf8c3f4d01d9547e87237977191573c6f5a.tar.xz linux-0d435bf8c3f4d01d9547e87237977191573c6f5a.zip | |
perf lock: Add -c/--combine-locks option
The -c or --combine-locks option is to merge lock instances in the
same class into a single entry. It compares the name of the locks
and marks duplicated entries using lock_stat->combined.
# perf lock report
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
&(ei->i_block_re... 8731 0 0 0 0 0
&sb->s_type->i_l... 8731 0 0 0 0 0
hrtimer_bases.lock 5261 0 0 0 0 0
hrtimer_bases.lock 2626 0 0 0 0 0
hrtimer_bases.lock 1953 0 0 0 0 0
hrtimer_bases.lock 1382 0 0 0 0 0
cpu_hotplug_lock 1350 0 0 0 0 0
hrtimer_bases.lock 1273 0 0 0 0 0
hrtimer_bases.lock 1269 0 0 0 0 0
# perf lock report -c
Name acquired contended avg wait (ns) total wait (ns) max wait (ns) min wait (ns)
rcu_read_lock 251225 0 0 0 0 0
hrtimer_bases.lock 39450 0 0 0 0 0
&sb->s_type->i_l... 10301 1 662 662 662 662
ptlock_ptr(page) 10173 2 701 1402 760 642
&(ei->i_block_re... 8732 0 0 0 0 0
&xa->xa_lock 8088 0 0 0 0 0
&base->lock 6705 0 0 0 0 0
&p->pi_lock 5549 0 0 0 0 0
&dentry->d_lockr... 5010 4 1274 5097 1844 789
&ep->lock 3958 0 0 0 0 0
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220127000050.3011493-6-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-lock.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-lock.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index 1b4d452923d7..f5eb95788969 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -54,6 +54,10 @@ REPORT OPTIONS Sorting key. Possible values: acquired (default), contended, avg_wait, wait_total, wait_max, wait_min. +-c:: +--combine-locks:: + Merge lock instances in the same class (based on name). + INFO OPTIONS ------------ |