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

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Date:	Tue, 10 Aug 2010 23:24:28 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Robert Richter <robert.richter@....com>
Cc:	Don Zickus <dzickus@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Lin Ming <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>,
	"Huang, Ying" <ying.huang@...el.com>,
	Yinghai Lu <yinghai@...nel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH] perf, x86: try to handle unknown nmis with running
	perfctrs

On Tue, Aug 10, 2010 at 09:05:41PM +0200, Robert Richter wrote:
> On 10.08.10 13:24:51, Cyrill Gorcunov wrote:
> 
> > It gets masked on NMI arrival, at least for some models (Core Duo, P4,
> > P6 M and I suspect more theh that, that was the reason oprofile has
> > it, also there is a note in SDM V3a page 643).
> 
> Yes, that's right, I never noticed that. Maybe it is better to
> implement the apic write it in model specific code then.
> 

Perhaps we can make it simplier I think, ie like it was before -- we just
move it under your new DIE_NMIUNKNOWN, in separate patch of course. Though
I'm fine with either way.

(actually it's interesting to know wouldn't we leave lvt masked when
 we hit 'second delayed nmi has arrived' situation, I guess we didn't
 hit it before in real yet :-)

> -Robert
> 
> -- 
> Advanced Micro Devices, Inc.
> Operating System Research Center
> 
	-- Cyrill
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