linux-kernel - Re: [PATCH] perf wrong branches event on AMD

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Message-ID: <20100701195439.GJ4078@ghostprotocols.net>
Date:	Thu, 1 Jul 2010 16:54:40 -0300
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Vince Weaver <vweaver1@...s.utk.edu>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH] perf wrong branches event on AMD

Em Thu, Jul 01, 2010 at 03:30:16PM -0400, Vince Weaver escreveu:
> Hello
> 
> while doing some performance counter validation tests on some assembly 
> language programs I noticed that the "branches:u" count was very wrong on 
> AMD machines.
> 
> It looks like the wrong event was selected.
> 
> This is why event selection needs to be in user-space... it could be fixed 
> instantly there, but the way things are done now it will take months to 
> years for this fix to filter down to those trying to use perf counters...

Well, you can use:

  rNNN (see 'perf list --help' on how to encode it) [Raw hardware event descriptor]

In the meantime.

- Arnaldo
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