diff options
| author | Zhengjun Xing <zhengjun.xing@linux.intel.com> | 2022-04-22 14:56:34 +0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-04-22 14:23:35 -0300 |
| commit | 2c8e64514aa2ea414c8ada6c77405680267d0ab3 (patch) | |
| tree | dca4b305562e98c04241ef013a2ac21fc9c4874f /tools/perf/Documentation/perf-stat.txt | |
| parent | 60344f1a9a597f2e0efcd57df5dad0b42da15e21 (diff) | |
perf stat: Merge event counts from all hybrid PMUs
For hybrid events, by default stat aggregates and reports the event counts
per pmu.
# ./perf stat -e cycles -a sleep 1
Performance counter stats for 'system wide':
14,066,877,268 cpu_core/cycles/
6,814,443,147 cpu_atom/cycles/
1.002760625 seconds time elapsed
Sometimes, it's also useful to aggregate event counts from all PMUs.
Create a new option '--hybrid-merge' to enable that behavior and report
the counts without PMUs.
# ./perf stat -e cycles -a --hybrid-merge sleep 1
Performance counter stats for 'system wide':
20,732,982,512 cycles
1.002776793 seconds time elapsed
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20220422065635.767648-2-zhengjun.xing@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-stat.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index c06c341e72b9..8d1cde00b8d6 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -454,6 +454,16 @@ Multiple events are created from a single event specification when: 2. Aliases, which are listed immediately after the Kernel PMU events by perf list, are used. +--hybrid-merge:: +Merge the hybrid event counts from all PMUs. + +For hybrid events, by default, the stat aggregates and reports the event +counts per PMU. But sometimes, it's also useful to aggregate event counts +from all PMUs. This option enables that behavior and reports the counts +without PMUs. + +For non-hybrid events, it should be no effect. + --smi-cost:: Measure SMI cost if msr/aperf/ and msr/smi/ events are supported. |