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

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Message-ID: <20120702210008.GB14479@tassilo.jf.intel.com>
Date:	Mon, 2 Jul 2012 14:00:08 -0700
From:	Andi Kleen <ak@...ux.intel.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/5] perf, x86: Enable PDIR precise instruction profiling
 on IvyBridge

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

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

At which p level do you want it? Or on by default?

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

Ok so you want a new flag? Or a new event?

-Andi

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