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perf: Only dump the throttle log for the leader

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The PERF_RECORD_THROTTLE records are dumped for all throttled events.
It's not necessary for group events, which are throttled altogether.

Optimize it by only dump the throttle log for the leader.

The sample right after the THROTTLE record must be generated by the
actual target event. It is good enough for the perf tool to locate the
actual target event.

Suggested-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20250520181644.2673067-3-kan.liang@linux.intel.com
This commit is contained in:
Kan Liang 2025-05-20 11:16:30 -07:00 committed by Peter Zijlstra
parent 9734e25fbf
commit e800ac5120
1 changed files with 4 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

6
kernel/events/core.c
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@ -2650,14 +2650,16 @@ static void perf_event_unthrottle(struct perf_event *event, bool start)
event->hw.interrupts = 0; event->hw.interrupts = 0;
if (start) if (start)
event->pmu->start(event, 0); event->pmu->start(event, 0);
perf_log_throttle(event, 1); if (event == event->group_leader)
perf_log_throttle(event, 1);
} }
static void perf_event_throttle(struct perf_event *event) static void perf_event_throttle(struct perf_event *event)
{ {
event->pmu->stop(event, 0); event->pmu->stop(event, 0);
event->hw.interrupts = MAX_INTERRUPTS; event->hw.interrupts = MAX_INTERRUPTS;
perf_log_throttle(event, 0); if (event == event->group_leader)
perf_log_throttle(event, 0);
} }
static void perf_event_unthrottle_group(struct perf_event *event, bool skip_start_event) static void perf_event_unthrottle_group(struct perf_event *event, bool skip_start_event)