linux-kernel - Re: [PATCH] x86: add the debugfs interface for the sysprof tool

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Message-Id: <1203822747.2439.1.camel@entropy>
Date:	Sat, 23 Feb 2008 19:12:27 -0800
From:	Nicholas Miell <nmiell@...cast.net>
To:	Pekka Enberg <penberg@...helsinki.fi>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, mingo@...e.hu, sandmann@...hat.com,
	tglx@...x.de, hpa@...or.com
Subject: Re: [PATCH] x86: add the debugfs interface for the sysprof tool


On Sun, 2008-02-24 at 04:49 +0200, Pekka Enberg wrote:
> Hi Andrew,
> 
> Andrew Morton wrote:
> > I didn't need to write a new kernel module to enable that
> > thirteen-character shell script, and I don't believe one needs to write a
> > new kernel module to put a nice easy-to-use GUI around oprofile either.
> > 
> > This is one of those i-cant-believe-im-having-this-discussion discussions.
> 
> Sysprof tracks the full stack frame so it can provide meaningful call 
> tree (who called what) which is invaluable for spotting hot _paths_. I 
> don't see how oprofile can do that as it tracks instruction pointers only.
> 
> 			Pekka

You could try passing the --callgraph option to opcontrol.

-- 
Nicholas Miell <nmiell@...cast.net>

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