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

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Date:	Wed, 13 Jun 2012 23:43:58 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Andi Kleen <ak@...ux.intel.com>
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, 2012-06-13 at 14:36 -0700, Andi Kleen wrote:
> > This patch is just wrong on too many levels.. where do you want me to
> > start. Lets go with the restriction you mention is lifted, the SDM
> > doesn't mention this, 
> 
> The SDM is wrong. The restriction is Sandy Bridge only.

It would be good to mention this -- at the very least until the SDM is
revised.

> >nor does the patch actually lift it.
> 
> Why not? It works for me on a Ivy Bridge.

I'm very sure you didn't test it properly then. Clearly you need a hint:

struct event_constraint intel_snb_pebs_event_constraints[] = {
        INTEL_UEVENT_CONSTRAINT(0x01c0, 0x2), /* INST_RETIRED.PRECDIST */

Is still in effect, isn't it..
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