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

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Message-ID: <20081114175056.GK3810@one.firstfloor.org>
Date:	Fri, 14 Nov 2008 18:50:56 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Mikael Pettersson <mikpe@...uu.se>,
	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

> >And no, blindly subtracting 16 from IP is not a fix.
> 
> Who mentioned a fix ? I am only giving more fuel to Intel guys so they
> hopefully can give us a working oprofile.

You would need to implement PEBS support to avoid that problem. But it's a big
task. perfmon2 implements it already.

-Andi
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