linux-kernel - Re: [PATCH 06/14] perf, x86: PEBS infrastructure

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Message-ID: <1267817979.4942.9.camel@laptop>
Date:	Fri, 05 Mar 2010 20:39:39 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Paul Mackerras <paulus@...ba.org>, mingo@...e.hu,
	linux-kernel@...r.kernel.org, robert.richter@....com,
	fweisbec@...il.com, Arnaldo Carvalho de Melo <acme@...radead.org>
Subject: Re: [PATCH 06/14] perf, x86: PEBS infrastructure

On Fri, 2010-03-05 at 11:11 -0800, Stephane Eranian wrote:
> By rewinding you get the IP of the instruction that caused the event. But the
> register state is STILL reflecting the situation at retirement of that
> instruction. 

I'm quite aware of that, but its near impossible to reverse interpret
instructions such as "mov rdx, $rdx", so until we get fault like PEBS
we'll just have to live with this.

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