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

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Message-ID: <20100825111944.GA21682@elte.hu>
Date:	Wed, 25 Aug 2010 13:19:44 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Robert Richter <robert.richter@....com>
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


* Robert Richter <robert.richter@....com> wrote:

> 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.

I understand that, but obviously the patches need to fix the lack of 
messages without introducing new regressions: such as messages not seen 
before and CPUs with stuck NMIs.

Thanks,

	Ingo
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