linux-kernel - Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running perfctrs

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Message-ID: <20100825110218.GG3198@erda.amd.com>
Date:	Wed, 25 Aug 2010 13:02:18 +0200
From:	Robert Richter <robert.richter@....com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Don Zickus <dzickus@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	Lin Ming <ming.m.lin@...el.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH -v3] perf, x86: try to handle unknown nmis with running
 perfctrs

On 25.08.10 06:41:30, Ingo Molnar wrote:

> > > > > Uhhuh. NMI received for unknown reason 00 on CPU 9.
> > > > > Do you have a strange power saving mode enabled?
> > > > > Dazed and confused, but trying to continue
> 
> Before the two patches i did not get these messages at all, on any of 
> the systems.

Yes, because all were eaten by NOTIFY_STOP, and that's why we also
lose NMIs from other sources, like the nmi button. The patches try to
fix this.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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