linux-kernel - Re: [perf/rc5] oops running perf record -s with multiple -e

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Date:	Thu, 06 Aug 2009 17:38:00 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Brice Goglin <Brice.Goglin@...ia.fr>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [perf/rc5] oops running perf record -s with multiple -e

On Thu, 2009-08-06 at 08:26 +0200, Brice Goglin wrote:
> Hello Ingo
> 
> I finally managed to test the threaded perfcounter statistics (thanks a
> lot for implementing it). I am running 2.6.31-rc5 (with the AMD
> magny-cours patches but I don't think they matter here). I am trying to
> measure local/remote memory accesses per thread during the well-known
> stream benchmark. It's compiled with OpenMP using 16 threads on a
> quad-socket quad-core barcelona machine.
> 
> Command line is:
>  /mnt/scratch/bgoglin/cpunode/linux-2.6.31/tools/perf/perf record -f -s
> -e r1000001e0 -e r1000002e0 -e r1000004e0 -e r1000008e0 ./stream
> 
> It seems to work fine with a single -e <counter> on the command line
> while it crashes when there are at least 2 of them.
> It seems to work fine without -s as well.

OK, I can reproduce OOPSen this way, got me baffled though.

I'll prod at it some...
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