Messages in this thread Patch in this message | | | From | Andi Kleen <> | Subject | [PATCH 1/2] pebs, x86: Make sure to really disable PEBS | Date | Sat, 18 Aug 2012 09:15:29 -0700 |
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From: Andi Kleen <ak@linux.intel.com>
When disabling a PEBS event we need to check the old value to determine if PEBS was running. Otherwise the last PEBS value could be kept running.
Signed-off-by: Andi Kleen <ak@linux.intel.com> --- arch/x86/kernel/cpu/perf_event_intel_ds.c | 3 ++- 1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c index e38d97b..db49ab3 100644 --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c @@ -438,9 +438,10 @@ void intel_pmu_pebs_disable(struct perf_event *event) { struct cpu_hw_events *cpuc = &__get_cpu_var(cpu_hw_events); struct hw_perf_event *hwc = &event->hw; + u64 old = cpuc->pebs_enabled; cpuc->pebs_enabled &= ~(1ULL << hwc->idx); - if (cpuc->enabled) + if (old) wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled); hwc->config |= ARCH_PERFMON_EVENTSEL_INT; -- 1.7.7.6
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