linux-kernel - Re: [PATCH 1/2] perf, x86: Revamp PEBS event selection

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Message-ID: <CABPqkBQ7x7-Ma2xJFKGBj3Nnsac1J_5PG9us6xgU1ES+WHkMUQ@mail.gmail.com>
Date:	Wed, 2 Jul 2014 18:07:31 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] perf, x86: Revamp PEBS event selection

On Wed, Jul 2, 2014 at 5:48 PM, Andi Kleen <ak@...ux.intel.com> wrote:
> On Wed, Jul 02, 2014 at 05:44:05PM +0200, Stephane Eranian wrote:
>> On Wed, Jul 2, 2014 at 5:33 PM, Andi Kleen <ak@...ux.intel.com> wrote:
>> >> No, still needs to be INTEL_ALL_EVENT_CONSTRAINT(0x0, 0x1)
>> >> otherwise the get_event_constraint() test I mentioned previously will
>> >> fail, event with your ALL_FILTER mask.
>> >
>> > What events should fail? I verified all PEBS events and they work as expected.
>> >
>> Random events should not fail, they should go with precise and not generate
>> any samples. That's the whole point of the exercise.
>>
>> perf record -a -e r6099:p sleep 1
>
> Like I said I ran all PEBS events and they generated samples.
>
I understand. I ran some random events to make sure I was not
getting PEBS samples and the system was stable.
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