linux-kernel - Re: [PATCH 2/5] perf, x86: Enable PDIR precise instruction profiling on IvyBridge

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Message-ID: <CABPqkBT4Dgte73hM+im0VP-Px1rXXURcyHhsSA2RYXCTZSdOxg@mail.gmail.com>
Date:	Thu, 5 Jul 2012 17:45:16 +0200
From:	Stephane Eranian <eranian@...gle.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andi Kleen <ak@...ux.intel.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>, x86@...nel.org,
	linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH 2/5] perf, x86: Enable PDIR precise instruction profiling
 on IvyBridge

On Tue, Jul 3, 2012 at 6:04 AM, Andi Kleen <andi@...stfloor.org> wrote:
>> Well, the only way I can think of would be to request that the
>> event be programmed with exclusive mode ALWAYS. That
>> should not be to hard to add.
>
> I suspect it would need some special callbacks from the events core,
> that's why I only tried on IvyBridge.
>x
You could simply add a check in the x86 init code like what is done
with the pebs events and precise mode.

> Anyways, I'll drop it as the people in charge didn't approve of
> instruction sampling.
>
> -Andi
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