linux-kernel - Re: [PATCH -v2] perf, x86: try to handle unknown nmis with running perfctrs

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Message-ID: <20100816073701.GF26154@erda.amd.com>
Date:	Mon, 16 Aug 2010 09:37:01 +0200
From:	Robert Richter <robert.richter@....com>
To:	Don Zickus <dzickus@...hat.com>
CC:	Cyrill Gorcunov <gorcunov@...il.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 -v2] perf, x86: try to handle unknown nmis with running
 perfctrs

On 12.08.10 14:21:26, Don Zickus wrote:

> > I was testing the patch further, it properly filters perfctr
> > back-to-back nmis. I was able to reliable detect unknown nmis
> > triggered by the nmi button during high load perf sessions with
> > multiple counters, no false positives.
> 
> For my own curiousity, what type of high load perf sessions are you using
> to test this.  I don't know perf well enough to have it generate events
> across multiple perfctrs.

You put load on all cpus and then start something like the following:

 perf record -e cycles -e instructions -e cache-references \
 	-e cache-misses -e branch-misses -a -- sleep 10

-Robert

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

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