perf evlist: Warn when 'sleep' workload is used without system-wide (-a) option

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A common mistake when trying to record system-wide profiles for a given
duration is running commands like 'perf record sleep 1' or 'perf stat
sleep 1' without passing '-a' / '--all-cpus'. When '-a' is omitted, perf
defaults to per-process monitoring of the sleep process itself, which
does not collect system-wide activity and records very few events.

Add a warning in evlist__prepare_workload() when the workload executable
is 'sleep' and system-wide mode is not enabled.

Assisted-by: Antigravity:gemini-3.6-flash
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

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Ian Rogers 2026-08-05 21:14:14 -07:00 • committed by Namhyung Kim

parent 16e113d46d

commit 78148c8529

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tools/perf/util/evlist.c

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