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perf, x86: Avoid double disable on throttle vs ioctl(PERF_IOC_DISABLE)

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Calling ioctl(PERF_EVENT_IOC_DISABLE) on a thottled counter would result
in a double disable, cure this by using x86_pmu_{start,stop} for
throttle/unthrottle and teach x86_pmu_stop() to check ->active_mask.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@infradead.org>
Cc: paulus@samba.org
Cc: eranian@google.com
Cc: robert.richter@amd.com
Cc: fweisbec@gmail.com
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2010-03-08 17:51:33 +01:00
committed by Ingo Molnar
parent c08053e627
commit 71e2d28280
2 changed files with 7 additions and 15 deletions
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arch/x86/kernel/cpu/perf_event_intel.c
+1 -1
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@@ -774,7 +774,7 @@ again:
data.period = event->hw.last_period;
if (perf_event_overflow(event, 1, &data, regs))
intel_pmu_disable_event(event);
x86_pmu_stop(event);
}
intel_pmu_ack_status(ack);