diff options
| author |   Kan Liang <kan.liang@linux.intel.com> | 2025-05-20 11:16:30 -0700 |
|---|---|---|
| committer |   Peter Zijlstra <peterz@infradead.org> | 2025-05-21 13:57:43 +0200 |
| commit | e800ac51202f053018f3d6acb1819ecec4d75a2c (patch) | |
| tree | abbf30b14c39b9c81866311bcd54741ce1f0ed04 /kernel | |
| parent | perf: Fix the throttle logic for a group (diff) | |
| download | wireguard-linux-e800ac51202f053018f3d6acb1819ecec4d75a2c.tar.xz wireguard-linux-e800ac51202f053018f3d6acb1819ecec4d75a2c.zip | |
perf: Only dump the throttle log for the leader
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
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index 8327ab0ee641..f34c99f8ce8f 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2650,14 +2650,16 @@ static void perf_event_unthrottle(struct perf_event *event, bool start) event->hw.interrupts = 0; if (start) 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) { event->pmu->stop(event, 0); 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) |