linux-kernel - Re: perf top broken on ppc64

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Message-Id: <12E39DE6-0957-43CD-8DD4-24970AAF45D3@suse.de>
Date:	Wed, 21 Apr 2010 11:29:44 +0200
From:	Alexander Graf <agraf@...e.de>
To:	Ian Munsie <imunsie@....ibm.com>
Cc:	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	ppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	LKML Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: perf top broken on ppc64


On 21.04.2010, at 07:29, Ian Munsie wrote:

> Excerpts from Alexander Graf's message of Wed Apr 21 09:21:36 +1000 2010:
>> Hi,
>> 
>> While trying to find out performance bottlenecks in KVM for PowerPC I
>> figured I'd try and use "perf top" to see what's going on in the
>> system. This works great on my G4, but doesn't on the Powerstation
>> (970MP).
>> 
>> The only weird thing I can imagine about this setup is that I'm
>> running 32 bit userland on a 64 bit kernel. So I went ahead and
>> compiled perf for ppc64 - without any change:
> 
> I'm using 32 bit userland and 64 bit kernel on a PowerPC box and it's working for me.
> Are you building perf from the tip tree?

I'm using kvm.git which is pretty close to tip. The version says something 2.6.34-rc3'ish. Has anything significantly changed since then?

Either way - I'll give it a try.


Alex

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