linux-kernel - Re: [PATCH 07/12] perf_events: add LBR software filter support for Intel X86

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Message-ID: <1317986519.31132.13.camel@twins>
Date:	Fri, 07 Oct 2011 13:21:59 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, acme@...hat.com, ming.m.lin@...el.com,
	robert.richter@....com, ravitillo@....gov,
	"masami.hiramatsu.pt" <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH 07/12] perf_events: add LBR software filter support for
 Intel X86

On Fri, 2011-10-07 at 13:18 +0200, Peter Zijlstra wrote:
> > Yeah, depending on the depth of the LBR. But then what happens, you
> > decode an instruction that is not what was executed. 
> 
> Right, and Andi's concern is that this might cause our instruction
> decoder to blow up, or worse. 

That is, we have a fair confidence that its capable of correctly
decoding correct streams, but I understood from Masami that they haven't
actually tried feeding it crap.
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