Messages in this thread | | | From | Song Liu <> | Subject | Re: [PATCH v5] perf stat: Enable BPF counter with --for-each-cgroup | Date | Fri, 2 Jul 2021 04:18:05 +0000 |
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> On Jul 1, 2021, at 2:12 PM, Namhyung Kim <namhyung@kernel.org> wrote: > > Recently bperf was added to use BPF to count perf events for various > purposes. This is an extension for the approach and targetting to > cgroup usages. > > Unlike the other bperf, it doesn't share the events with other > processes but it'd reduce unnecessary events (and the overhead of > multiplexing) for each monitored cgroup within the perf session. > > When --for-each-cgroup is used with --bpf-counters, it will open > cgroup-switches event per cpu internally and attach the new BPF > program to read given perf_events and to aggregate the results for > cgroups. It's only called when task is switched to a task in a > different cgroup. > > Cc: Song Liu <songliubraving@fb.com> > Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Song Liu <songliubraving@fb.com>
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