linux-kernel - Re: [perf] howto switch from pfmon

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Date:	Tue, 23 Jun 2009 16:00:21 +0200
From:	Brice Goglin <Brice.Goglin@...ia.fr>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>, paulus@...ba.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [perf] howto switch from pfmon

Ingo Molnar wrote:
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>   
>>  $ perf stat -e cycles -e instructions -e r1000ffe0 ./hackbench 10
>>  Time: 0.186
>>     
>
> Correction: that should be r10000ffe0.
>   

Oh thanks a lot, it seems to work now!

One strange thing I noticed: sometimes perf reports that there were some
accesses to target numa nodes 4-7 while my box only has 4 numa nodes:
If I request counters only for the non-existing target numa nodes (4-7,
with -e r1000010e0 -e r1000020e0 -e r1000040e0 -e r1000080e0), I always
get 4 zeros.
But if I mix some couinters from the existing nodes (0-3) with some
counters from non-existing nodes (4-7), the non-existing ones report
some small but non-empty values.
Does it ring any bell?

Brice

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