linux-kernel - Re: [RFC PATCH 6/7] perf, x86: large PEBS interrupt threshold

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Message-ID: <20140528192853.GY13658@twins.programming.kicks-ass.net>
Date:	Wed, 28 May 2014 21:28:53 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	"Yan, Zheng" <zheng.z.yan@...el.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, eranian@...gle.com
Subject: Re: [RFC PATCH 6/7] perf, x86: large PEBS interrupt threshold

On Wed, May 28, 2014 at 07:05:31PM +0200, Peter Zijlstra wrote:
> If we get the PMI (where denoted) we can actually reconstruct which
> event triggered, by looking at which bit(s) flipped between the recorded
> state and the current state (due to E coming before F)
> 

just a bit flip (xor) isn't enough, we need to find the bit that flipped
off, so the condition gets slightly more complicated.

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