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

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Date:	Wed, 13 Jun 2012 15:04:55 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] perf, x86: Enable PDIR precise instruction profiling
 on IvyBridge

On Wed, Jun 13, 2012 at 11:58:58PM +0200, Peter Zijlstra wrote:
> On Wed, 2012-06-13 at 14:54 -0700, Andi Kleen wrote:
> > Yes it's in effect, and it forces the event to counter 1. 
> > That is correct and that restriction is still there. 
> 
> OK, when we cannot magically replace 'instructions' with pdir.

Why not?  You want a new event?

It's still retired instructions, just sampled in a slightly different way.

Today instructions:pp just errors out BTW, so nothing should rely on it.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only
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