linux-kernel - Re: Oprofile : need to adjust PC by 16 bytes

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Message-ID: <20081114155904.GJ3810@one.firstfloor.org>
Date:	Fri, 14 Nov 2008 16:59:04 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>,
	oprofile-list@...ts.sf.net, Ingo Molnar <mingo@...e.hu>,
	Jiri Kosina <jkosina@...e.cz>, Jiri Benc <jbenc@...e.cz>,
	Vilem Marsik <vmarsik@...e.cz>,
	Pekka Enberg <penberg@...helsinki.fi>,
	linux-kernel@...r.kernel.org
Subject: Re: Oprofile : need to adjust PC by 16 bytes

On Fri, Nov 14, 2008 at 04:25:51PM +0100, Eric Dumazet wrote:
> Very strange results on my Intel E5450 CPU
> 
> I found that I have to bias regs->ip by 16 bytes in order to have
> correct profiling.

Can you expand a bit how you determined if the profile is right or wrong?

-Andi
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