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    Subject[tip:perf/core] perf: Ignore non-sampling overflows
    Commit-ID:  963988262c3c8f4234f64a0dde59446a295e07bb
    Gitweb: http://git.kernel.org/tip/963988262c3c8f4234f64a0dde59446a295e07bb
    Author: Peter Zijlstra <a.p.zijlstra@chello.nl>
    AuthorDate: Wed, 24 Nov 2010 18:55:29 +0100
    Committer: Ingo Molnar <mingo@elte.hu>
    CommitDate: Fri, 26 Nov 2010 15:14:55 +0100

    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>
    ---
    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 98c5549..af1e63f 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 {

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