linux-kernel - Re: [regression 2.6.39-rc2][bisected] "perf, x86: P4 PMU - Read proper MSR register to catch" and NMIs

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Date:	Thu, 7 Apr 2011 07:18:50 +0400
From:	Cyrill Gorcunov <gorcunov@...nvz.org>
To:	Don Zickus <dzickus@...hat.com>
Cc:	Shaun Ruffell <sruffell@...ium.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: [regression 2.6.39-rc2][bisected] "perf, x86: P4 PMU - Read
 proper MSR register to catch" and NMIs

On Thursday, April 7, 2011, Don Zickus <dzickus@...hat.com> wrote:
> On Wed, Apr 06, 2011 at 05:30:36PM -0500, Shaun Ruffell wrote:
>> Hello Don,
>>
>> I was able to bisect it down to commit 242214f9c1eeaae40, but I'm not
>> certain where to go from here.  Is this something that is already known
>> or is there more information I should try to collect?
>
> Nope, this is an ongoing issue.  What happened was the perf P4 nmi handler
> was swallowing all the NMIs.  My patch fixed that and exposed a double NMI
> problem.  We have been chasing it for a couple of months.  I think Cyril
> was finally able to duplicate it (as he wrote the P4 code).  I have
> confidence that he will find a fix for it soon. :-)
>
> Thanks for the report though!
>
> Cheers,
> Don
>

Hi, yeah, i got it too and i hope to fix this issue soon. Will ping as
only get working fix.
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