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

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Message-ID: <20100820083609.GX26154@erda.amd.com>
Date:	Fri, 20 Aug 2010 10:36:09 +0200
From:	Robert Richter <robert.richter@....com>
To:	Don Zickus <dzickus@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	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 -v3] perf, x86: try to handle unknown nmis with running
 perfctrs

On 19.08.10 21:50:17, Don Zickus wrote:
> I tested this patch and Robert's on an AMD box and Nehalem box.  Both
> worked as intended.  However I did notice that whenever the AMD box
> detected handled >1, it was shortly followed by an unknown_nmi that was
> properly eaten with Robert's logic.  Whereas on the Nehalem box I saw a
> lot of 'handled > 1' messages but very very few of them were followed by
> an unknown_nmi message (and those messages that did come were properly
> eaten).

Don, thanks for testing this.

-Robert

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

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