linux-kernel - Re: [RFC][PATCH 08/11] perf, x86: Implement simple LBR support

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Message-ID: <1267734205.16716.4.camel@laptop>
Date:	Thu, 04 Mar 2010 21:23:25 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, paulus@...ba.org,
	robert.richter@....com, fweisbec@...il.com
Subject: Re: [RFC][PATCH 08/11] perf, x86: Implement simple LBR support

On Thu, 2010-03-04 at 19:18 +0100, Peter Zijlstra wrote:
> What is currently implemented is that we loose history at the point a
> new task schedules in an LBR using event.
> 
This also matches CPU errata AX14, AJ52 and AAK109 which states that a
task switch may produce faulty LBR state, so clearing history after a
task switch seems the best thing to do.

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