linux-kernel - Re: [PATCH] perf, x86: try to handle unknown nmis with running perfctrs

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Date:	Mon, 16 Aug 2010 16:37:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Huang Ying <ying.huang@...el.com>,
	Robert Richter <robert.richter@....com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	"Lin, Ming M" <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yinghai Lu <yinghai@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] perf, x86: try to handle unknown nmis with running
 perfctrs

On Wed, 2010-08-11 at 08:36 -0400, Don Zickus wrote:
> The only thing that might screw this up would be an SMI which takes longer
> than 1000 but that should be rare and would probably be related to the
> unknown NMI anyway. 

Long running SMIs aren't nearly as rare as you'd want them to be.
Hitting one in exactly the right spot will be, but given the numbers its
going to happen and make us scratch our heads..
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