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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-02-10 09:05:07 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-02-10 09:05:07 -0800 |
| commit | ce2814f227d3adae8456f7cbd0bd5f922fd284f0 (patch) | |
| tree | 351a35a80fb62307ea48bc1b74f687d309dbb31a /kernel | |
| parent | 1282ab3f8f7bca1d3a7fb701fbe4f0f772e72ea0 (diff) | |
| parent | f39d47ff819ed52a2afbdbecbe35f23f7755f58d (diff) | |
| download | linux-stable-ce2814f227d3adae8456f7cbd0bd5f922fd284f0.tar.gz linux-stable-ce2814f227d3adae8456f7cbd0bd5f922fd284f0.tar.bz2 linux-stable-ce2814f227d3adae8456f7cbd0bd5f922fd284f0.zip | |
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
perf: Fix double start/stop in x86_pmu_start()
perf evsel: Fix an issue where perf report fails to show the proper percentage
perf tools: Fix prefix matching for kernel maps
perf tools: Fix perf stack to non executable on x86_64
perf: Remove deprecated WARN_ON_ONCE()
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/events/core.c | 19 |
1 files changed, 14 insertions, 5 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c index ba36013cfb21..1b5c081d8b9f 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -2303,7 +2303,7 @@ do { \ static DEFINE_PER_CPU(int, perf_throttled_count); static DEFINE_PER_CPU(u64, perf_throttled_seq); -static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) +static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count, bool disable) { struct hw_perf_event *hwc = &event->hw; s64 period, sample_period; @@ -2322,9 +2322,13 @@ static void perf_adjust_period(struct perf_event *event, u64 nsec, u64 count) hwc->sample_period = sample_period; if (local64_read(&hwc->period_left) > 8*sample_period) { - event->pmu->stop(event, PERF_EF_UPDATE); + if (disable) + event->pmu->stop(event, PERF_EF_UPDATE); + local64_set(&hwc->period_left, 0); - event->pmu->start(event, PERF_EF_RELOAD); + + if (disable) + event->pmu->start(event, PERF_EF_RELOAD); } } @@ -2350,6 +2354,7 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, return; raw_spin_lock(&ctx->lock); + perf_pmu_disable(ctx->pmu); list_for_each_entry_rcu(event, &ctx->event_list, event_entry) { if (event->state != PERF_EVENT_STATE_ACTIVE) @@ -2381,13 +2386,17 @@ static void perf_adjust_freq_unthr_context(struct perf_event_context *ctx, /* * restart the event * reload only if value has changed + * we have stopped the event so tell that + * to perf_adjust_period() to avoid stopping it + * twice. */ if (delta > 0) - perf_adjust_period(event, period, delta); + perf_adjust_period(event, period, delta, false); event->pmu->start(event, delta > 0 ? PERF_EF_RELOAD : 0); } + perf_pmu_enable(ctx->pmu); raw_spin_unlock(&ctx->lock); } @@ -4562,7 +4571,7 @@ static int __perf_event_overflow(struct perf_event *event, hwc->freq_time_stamp = now; if (delta > 0 && delta < 2*TICK_NSEC) - perf_adjust_period(event, delta, hwc->last_period); + perf_adjust_period(event, delta, hwc->last_period, true); } /* |