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

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Message-ID: <84144f020802252227t729e8b0bif9c3c65e17304fd1@mail.gmail.com>
Date:	Tue, 26 Feb 2008 08:27:32 +0200
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Nicholas Miell" <nmiell@...cast.net>
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, levon@...ementarian.org
Subject: Re: [PATCH] x86: add the debugfs interface for the sysprof tool

On Sun, Feb 24, 2008 at 5:12 AM, Nicholas Miell <nmiell@...cast.net> wrote:
> > 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.
>
>  You could try passing the --callgraph option to opcontrol.

Hmm, perhaps I am missing something but I don't think that does what
sysprof does. At least I can't find where in the oprofile kernel code
does it save the full stack trace for user-space. John?

                        Pekka
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