linux-kernel - Re: [PATCH 1/2] perf x86: Make intel_pmu_enable

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Message-ID: <20130819144557.GH24092@twins.programming.kicks-ass.net>
Date:	Mon, 19 Aug 2013 16:45:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Jiri Olsa <jolsa@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [PATCH 1/2] perf x86: Make intel_pmu_enable_all to enable only
 active events

On Mon, Aug 19, 2013 at 04:31:31PM +0200, Stephane Eranian wrote:
> Yeah, I think you can have one NMI pending because it came
> while you were already servicing an NMI interrupt. Though, this
> is very unlikely.

Yeah exceedingly rare. I'm also fairly certain I've had NMIs right after
clearing EN bits. Although I cannot remember if that was on Intel or AMD
hardware, nor on what specific model :/
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