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| author | Namhyung Kim <namhyung@kernel.org> | 2023-01-26 01:09:36 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2023-02-02 20:32:19 +0100 |
| commit | 7b204399aee0d1048109d37456cd61b7f1bc0aed (patch) | |
| tree | f929d3aac64710f46ca12a1694c0d4253e31e8ca /tools/perf/Documentation | |
| parent | perf script: Add 'cgroup' field for output (diff) | |
| download | linux-7b204399aee0d1048109d37456cd61b7f1bc0aed.tar.xz linux-7b204399aee0d1048109d37456cd61b7f1bc0aed.zip | |
perf lock contention: Add -S/--callstack-filter option
The -S/--callstack-filter is to limit display entries having the given
string in the callstack (not only in the caller in the output).
The following example shows lock contention results if the callstack
has 'net' substring somewhere. Note that the caller '__dev_queue_xmit'
does not match to it, but it has 'inet6_csk_xmit' in the callstack.
This applies even if you don't use -v option to show the full callstack.
$ sudo ./perf lock con -abv -S net sleep 1
...
contended total wait max wait avg wait type caller
5 70.20 us 16.13 us 14.04 us spinlock __dev_queue_xmit+0xb6d
0xffffffffa5dd1c60 _raw_spin_lock+0x30
0xffffffffa5b8f6ed __dev_queue_xmit+0xb6d
0xffffffffa5cd8267 ip6_finish_output2+0x2c7
0xffffffffa5cdac14 ip6_finish_output+0x1d4
0xffffffffa5cdb477 ip6_xmit+0x457
0xffffffffa5d1fd17 inet6_csk_xmit+0xd7
0xffffffffa5c5f4aa __tcp_transmit_skb+0x54a
0xffffffffa5c6467d tcp_keepalive_timer+0x2fd
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.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/20230126000936.3017683-1-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 | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index 0f9f720e599d..11b8901d8d13 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -187,6 +187,12 @@ CONTENTION OPTIONS --lock-filter=<value>:: Show lock contention only for given lock addresses or names (comma separated list). +-S:: +--callstack-filter=<value>:: + Show lock contention only if the callstack contains the given string. + Note that it matches the substring so 'rq' would match both 'raw_spin_rq_lock' + and 'irq_enter_rcu'. + SEE ALSO -------- |