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

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Message-ID: <4E8EE885.9040703@hitachi.com>
Date:	Fri, 07 Oct 2011 20:54:45 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Stephane Eranian <eranian@...gle.com>,
	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
Subject: Re: [PATCH 07/12] perf_events: add LBR software filter support for
 Intel X86

(2011/10/07 20:21), Peter Zijlstra wrote:
> 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.

OK, I'll do hardening it.

Thanks,

-- 
Masami HIRAMATSU
Software Platform Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
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