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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2010-11-24 18:55:29 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2010-11-26 15:14:55 +0100 |
| commit | 963988262c3c8f4234f64a0dde59446a295e07bb (patch) | |
| tree | 4bdb97b340fe0432f7259bfcc7b64b4bc8d65c2d /kernel/perf_event.c | |
| parent | 5d508e820a23d9b6e8a149dfaa8ba5cbedf3d95c (diff) | |
| download | lwn-963988262c3c8f4234f64a0dde59446a295e07bb.tar.gz lwn-963988262c3c8f4234f64a0dde59446a295e07bb.zip | |
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>
Diffstat (limited to 'kernel/perf_event.c')
| -rw-r--r-- | kernel/perf_event.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 98c5549c8e29..af1e63f249f3 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -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 { |