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

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Message-ID: <20111007154229.GE14482@one.firstfloor.org>
Date:	Fri, 7 Oct 2011 17:42:29 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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

> just with self-modifying (JIT) code, though the depth of LBR is such that
> this is very unlikely (it must happen in the last 16 branches before the
> PMU interrupt).

Interrupts can make this window arbitary long.

-Andi


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