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

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Date:	Mon, 02 Jul 2012 22:22:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/5] perf, x86: Enable PDIR precise instruction
 profiling on IvyBridge

On Mon, 2012-07-02 at 21:57 +0200, Andi Kleen wrote:
> > Already told you no.
> 
> No on what? You don't want PDIR mode? Or you don't like something
> with my implementation?

Both are crap.

If anything its an PEBS alias, we have infrastructure for that, yet you
invent new things.

You do random things like only :pp for no apparent reason.

PDIR is only supported on a single counter, regular PEBS 'instructions'
events allow for 4+ counters. Therefore a direct substitution is not
valid.


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