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

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Message-ID: <491EF942.1090709@cosmosbay.com>
Date:	Sat, 15 Nov 2008 17:30:58 +0100
From:	Eric Dumazet <dada1@...mosbay.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	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
Subject: Re: Oprofile : need to adjust PC by 16 bytes

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 ?

Thanks


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