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| author | Song Liu <song@kernel.org> | 2021-04-25 23:43:31 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-04-29 15:30:58 +0200 |
| commit | 112cb56164bc2108a55aee785d841a35aab0616a (patch) | |
| tree | fec53329a1865ca4f3a26f09e4f74f2b816b1e5b /tools/perf/Documentation/perf-stat.txt | |
| parent | perf bpf: check perf_attr_map is compatible with the perf binary (diff) | |
| download | linux-112cb56164bc2108a55aee785d841a35aab0616a.tar.xz linux-112cb56164bc2108a55aee785d841a35aab0616a.zip | |
perf stat: Introduce config stat.bpf-counter-events
Currently, to use BPF to aggregate perf event counters, the user uses
--bpf-counters option. Enable "use bpf by default" events with a config
option, stat.bpf-counter-events. Events with name in the option will use
BPF.
This also enables mixed BPF event and regular event in the same sesssion.
For example:
perf config stat.bpf-counter-events=instructions
perf stat -e instructions,cs
The second command will use BPF for "instructions" but not "cs".
Signed-off-by: Song Liu <song@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Link: https://lore.kernel.org/r/20210425214333.1090950-4-song@kernel.org
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 | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 6ec5960b08c3..f10e24da23e9 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -97,6 +97,8 @@ report:: Use BPF programs to aggregate readings from perf_events. This allows multiple perf-stat sessions that are counting the same metric (cycles, instructions, etc.) to share hardware counters. + To use BPF programs on common events by default, use + "perf config stat.bpf-counter-events=<list_of_events>". --bpf-attr-map:: With option "--bpf-counters", different perf-stat sessions share |