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perf: Ignore non-sampling overflows 

Some arch implementations call perf_event_overflow() by 'accident',
ignore this.

Reported-by: Francis Moreau <francis.moro@gmail.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2010-11-24 18:55:29 +01:00 committed by Ingo Molnar
parent 5d508e820a
commit 963988262c
1 changed files with 7 additions and 0 deletions
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7
kernel/perf_event.c
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@ -4240,6 +4240,13 @@ static int __perf_event_overflow(struct perf_event *event, int nmi,
struct hw_perf_event *hwc = &event->hw;
int ret = 0;
/*
* Non-sampling counters might still use the PMI to fold short
* hardware counters, ignore those.
*/
if (unlikely(!is_sampling_event(event)))
return 0;
if (!throttle) {
hwc->interrupts++;
} else {