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author | Florian Fischer <florian.fischer@muhq.space> | 2022-04-20 13:23:53 +0300 |
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committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-04-20 19:44:56 +0300 |
commit | b03b89b350034f220cc24fc77c56990a97a796b2 (patch) | |
tree | 961b684131ac5f863ebc7a19e51b7d86f0aa00cc /tools/perf/util/evsel.h | |
parent | c735b0a5217620192a001323e1c2a4b4af5d3dea (diff) | |
download | linux-b03b89b350034f220cc24fc77c56990a97a796b2.tar.xz |
perf stat: Add user_time and system_time events
It bothered me that during benchmarking using 'perf stat' (to collect
for example CPU cache events) I could not simultaneously retrieve the
times spend in user or kernel mode in a machine readable format.
When running 'perf stat' the output for humans contains the times
reported by rusage and wait4.
$ perf stat -e cache-misses:u -- true
Performance counter stats for 'true':
4,206 cache-misses:u
0.001113619 seconds time elapsed
0.001175000 seconds user
0.000000000 seconds sys
But 'perf stat's machine-readable format does not provide this information.
$ perf stat -x, -e cache-misses:u -- true
4282,,cache-misses:u,492859,100.00,,
I found no way to retrieve this information using the available events
while using machine-readable output.
This patch adds two new tool internal events 'user_time' and
'system_time', similarly to the already present 'duration_time' event.
Both events use the already collected rusage information obtained by
wait4 and tracked in the global ru_stats.
Examples presenting cache-misses and rusage information in both human
and machine-readable form:
$ perf stat -e duration_time,user_time,system_time,cache-misses -- grep -q -r duration_time .
Performance counter stats for 'grep -q -r duration_time .':
67,422,542 ns duration_time:u
50,517,000 ns user_time:u
16,839,000 ns system_time:u
30,937 cache-misses:u
0.067422542 seconds time elapsed
0.050517000 seconds user
0.016839000 seconds sys
$ perf stat -x, -e duration_time,user_time,system_time,cache-misses -- grep -q -r duration_time .
72134524,ns,duration_time:u,72134524,100.00,,
65225000,ns,user_time:u,65225000,100.00,,
6865000,ns,system_time:u,6865000,100.00,,
38705,,cache-misses:u,71189328,100.00,,
Signed-off-by: Florian Fischer <florian.fischer@muhq.space>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: https://lore.kernel.org/r/20220420102354.468173-3-florian.fischer@muhq.space
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evsel.h')
-rw-r--r-- | tools/perf/util/evsel.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h index 041b42d33bf5..7e2209b47b39 100644 --- a/tools/perf/util/evsel.h +++ b/tools/perf/util/evsel.h @@ -30,6 +30,10 @@ typedef int (evsel__sb_cb_t)(union perf_event *event, void *data); enum perf_tool_event { PERF_TOOL_NONE = 0, PERF_TOOL_DURATION_TIME = 1, + PERF_TOOL_USER_TIME = 2, + PERF_TOOL_SYSTEM_TIME = 3, + + PERF_TOOL_MAX, }; /** struct evsel - event selector |