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

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Message-ID: <20081115183627.GL3810@one.firstfloor.org>
Date:	Sat, 15 Nov 2008 19:36:27 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Eric Dumazet <dada1@...mosbay.com>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Mikael Pettersson <mikpe@...uu.se>,
	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, eranian@...glemail.com
Subject: Re: Oprofile : need to adjust PC by 16 bytes

On Sat, Nov 15, 2008 at 05:30:58PM +0100, Eric Dumazet wrote:
> Andi Kleen a écrit :
> >>>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.
> >
> 
> Thanks for the information.
> 
> Hum, so I grabbed perfmon2 git tree, installed various tools...
> 
> I am quite new to pfmon and tried :
> 
> # pfmon --system-wide
> sizeof=64 44
> <press ENTER to stop session>
> 
> Then started "tbench 8", and got a kernel panic after 6 seconds.
> 
> 
> I was using oprofile like this
> 
> opcontrol --vmlinux=/path/vmlinux --start
> // doing some benchmarking...
> opreport -l vmlinux | head -n 40
> 
> 
> What would be a working equivalent for perfmon2 based tools ?

Probably getting a perfmon tree that works. I guess Stephane
can help (cc'ed).  Or just deal with imprecise events for now.

-Andi
-- 
ak@...ux.intel.com
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