diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2022-07-25 11:31:22 -0700 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-07-25 17:55:51 -0300 |
| commit | 528b9cab3b813a3b94a4af14845308f720eb13fd (patch) | |
| tree | 600787048f94add041565acd3596c0d3d7da5dea /tools/perf/Documentation/perf-lock.txt | |
| parent | f9c695a21103bb1665aaa87c7592ac17303fc160 (diff) | |
| download | lwn-528b9cab3b813a3b94a4af14845308f720eb13fd.tar.gz lwn-528b9cab3b813a3b94a4af14845308f720eb13fd.zip | |
perf lock: Add 'contention' subcommand
The 'perf lock contention' processes the lock contention events and
displays the result like perf lock report. Right now, there's not
much difference between the two but the lock contention specific
features will come soon.
$ perf lock contention
contended total wait max wait avg wait type caller
238 1.41 ms 29.20 us 5.94 us spinlock update_blocked_averages+0x4c
1 902.08 us 902.08 us 902.08 us rwsem:R do_user_addr_fault+0x1dd
81 330.30 us 17.24 us 4.08 us spinlock _nohz_idle_balance+0x172
2 89.54 us 61.26 us 44.77 us spinlock do_anonymous_page+0x16d
24 78.36 us 12.27 us 3.27 us mutex pipe_read+0x56
2 71.58 us 59.56 us 35.79 us spinlock __handle_mm_fault+0x6aa
6 25.68 us 6.89 us 4.28 us spinlock do_idle+0x28d
1 18.46 us 18.46 us 18.46 us rtmutex exec_fw_cmd+0x21b
3 15.25 us 6.26 us 5.08 us spinlock tick_do_update_jiffies64+0x2c
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Boqun Feng <boqun.feng@gmail.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Waiman Long <longman@redhat.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20220725183124.368304-4-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, 3 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index 4b8568f0c53b..da0bcbc676a3 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -8,7 +8,7 @@ perf-lock - Analyze lock events SYNOPSIS -------- [verse] -'perf lock' {record|report|script|info} +'perf lock' {record|report|script|info|contention} DESCRIPTION ----------- @@ -27,6 +27,8 @@ and statistics with this 'perf lock' command. 'perf lock info' shows metadata like threads or addresses of lock instances. + 'perf lock contention' shows contention statistics. + COMMON OPTIONS -------------- |