diff options
| author | Namhyung Kim <namhyung@kernel.org> | 2022-12-19 12:17:30 -0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-12-21 14:52:39 -0300 |
| commit | 511e19b9e2112463c33a744ecb8a798056074408 (patch) | |
| tree | bcee7bbdd87e3198fe76094fbbf14e228c4eff68 /tools/perf/Documentation | |
| parent | 529772c4df286159fea453957a6052e20b90e8a8 (diff) | |
perf lock contention: Add -L/--lock-filter option
The -L/--lock-filter option is to filter only given locks. The locks
can be specified by address or name (if exists).
$ sudo ./perf lock record -a sleep 1
$ sudo ./perf lock con -l
contended total wait max wait avg wait address symbol
57 1.11 ms 42.83 us 19.54 us ffff9f4140059000
15 280.88 us 23.51 us 18.73 us ffffffff9d007a40 jiffies_lock
1 20.49 us 20.49 us 20.49 us ffffffff9d0d50c0 rcu_state
1 9.02 us 9.02 us 9.02 us ffff9f41759e9ba0
$ sudo ./perf lock con -L jiffies_lock,rcu_state
contended total wait max wait avg wait type caller
15 280.88 us 23.51 us 18.73 us spinlock tick_sched_do_timer+0x93
1 20.49 us 20.49 us 20.49 us spinlock __softirqentry_text_start+0xeb
$ sudo ./perf lock con -L ffff9f4140059000
contended total wait max wait avg wait type caller
38 779.40 us 42.83 us 20.51 us spinlock worker_thread+0x50
11 216.30 us 39.87 us 19.66 us spinlock queue_work_on+0x39
8 118.13 us 20.51 us 14.77 us spinlock kthread+0xe5
Committer testing:
# uname -a
Linux quaco 6.0.12-200.fc36.x86_64 #1 SMP PREEMPT_DYNAMIC Thu Dec 8 17:15:53 UTC 2022 x86_64 x86_64 x86_64 GNU/Linux
# perf lock record
^C[ perf record: Woken up 1 times to write data ]
# perf lock con -L jiffies_lock,rcu_state
contended total wait max wait avg wait type caller
# perf lock con
contended total wait max wait avg wait type caller
1 9.06 us 9.06 us 9.06 us spinlock call_timer_fn+0x24
# perf lock con -L call
ignore unknown symbol: call
contended total wait max wait avg wait type caller
1 9.06 us 9.06 us 9.06 us spinlock call_timer_fn+0x24
#
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Blake Jones <blakejones@google.com>
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: Song Liu <song@kernel.org>
Cc: bpf@vger.kernel.org
Link: https://lore.kernel.org/r/20221219201732.460111-5-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -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 dea04ad5c28e..0f9f720e599d 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -183,6 +183,10 @@ CONTENTION OPTIONS Note that RW-variant of locks have :R and :W suffix. Names without the suffix are shortcuts for the both variants. Ex) rwsem = rwsem:R + rwsem:W. +-L:: +--lock-filter=<value>:: + Show lock contention only for given lock addresses or names (comma separated list). + SEE ALSO -------- |