linux-kernel - Re: [PATCH 1/8] perf,x86: disable PEBS-LL in intel_pmu_pebs

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Date:	Wed, 26 Jun 2013 09:35:44 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 1/8] perf,x86: disable PEBS-LL in intel_pmu_pebs_disable()

On Mon, Jun 24, 2013 at 10:44 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Fri, Jun 21, 2013 at 04:20:41PM +0200, Stephane Eranian wrote:
>> Make sure intel_pmu_pebs_disable() and intel_pmu_pebs_enable()
>> are symmetrical w.r.t. PEBS-LL and precise store.
>>
>> Signed-off-by: Stephane Eranian <eranian@...gle.com>
>
> This seems unrelated to the actual patch series and should still go in.
>
Yes, it is unrelated. I just ran into it while testing the patch.
It was missing since the beginning, it seems.

>
>> ---
>>  arch/x86/kernel/cpu/perf_event_intel_ds.c | 6 ++++++
>>  1 file changed, 6 insertions(+)
>>
>> diff --git a/arch/x86/kernel/cpu/perf_event_intel_ds.c b/arch/x86/kernel/cpu/perf_event_intel_ds.c
>> index ed3e553..3065c57 100644
>> --- a/arch/x86/kernel/cpu/perf_event_intel_ds.c
>> +++ b/arch/x86/kernel/cpu/perf_event_intel_ds.c
>> @@ -653,6 +653,12 @@ void intel_pmu_pebs_disable(struct perf_event *event)
>>       struct hw_perf_event *hwc = &event->hw;
>>
>>       cpuc->pebs_enabled &= ~(1ULL << hwc->idx);
>> +
>> +     if (event->hw.constraint->flags & PERF_X86_EVENT_PEBS_LDLAT)
>> +             cpuc->pebs_enabled &= ~(1ULL << (hwc->idx + 32));
>> +     else if (event->hw.constraint->flags & PERF_X86_EVENT_PEBS_ST)
>> +             cpuc->pebs_enabled &= ~(1ULL << 63);
>> +
>>       if (cpuc->enabled)
>>               wrmsrl(MSR_IA32_PEBS_ENABLE, cpuc->pebs_enabled);
>>
>> --
>> 1.8.1.2
>>
--
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