linux-kernel - Re: A question of perf NMI handler

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Message-ID: <20100804102910.GI26154@erda.amd.com>
Date:	Wed, 4 Aug 2010 12:29:10 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Lin Ming <ming.m.lin@...el.com>, Ingo Molnar <mingo@...e.hu>,
	Don Zickus <dzickus@...hat.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	"fweisbec@...il.com" <fweisbec@...il.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Huang, Ying" <ying.huang@...el.com>
Subject: Re: A question of perf NMI handler

On 04.08.10 06:24:18, Peter Zijlstra wrote:
> On Wed, 2010-08-04 at 12:01 +0200, Robert Richter wrote:
> > To ensure that all other nmi handlers are
> > called, the perfctr's nmi handler must have the lowest priority. Then,
> > the handler will be the last in the chain. 
> 
> Well, unless another NMI handler has the exact same issue and also
> starts eating all NMIs, just in case.

In this case we will have to change the implementation for unhandled
nmis. But I don't know of other sources with this issue.

-Robert

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

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