Messages in this thread Patch in this message | | | Date | Mon, 18 Oct 2010 16:38:43 -0200 | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH tip/rt/head] perf: Mark software events as irqsafe |
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From: Peter Zijlstra <peterz@infradead.org>
Noticed while using 'perf top' on a machine without a supported PMU on 2.6.33.7-rt29, when top falls back to using the "cpu-clock" software event.
Reproduced on other machines where the problem was masked due to the existence and use of hardware events, by explicitely asking for a software event using:
perf top -e cpu-clock
Signed-off-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Arnaldo Carvalho de Melo <acme@infradead.org>
diff --git a/kernel/perf_event.c b/kernel/perf_event.c index 6dfaf5b..b9fbc17 100644 --- a/kernel/perf_event.c +++ b/kernel/perf_event.c @@ -4238,6 +4238,7 @@ static void perf_swevent_start_hrtimer(struct perf_event *event) struct hw_perf_event *hwc = &event->hw; hrtimer_init(&hwc->hrtimer, CLOCK_MONOTONIC, HRTIMER_MODE_REL); + hwc->hrtimer.irqsafe = 1; hwc->hrtimer.function = perf_swevent_hrtimer; if (hwc->sample_period) { u64 period;
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