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

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Message-ID: <47C0DB2E.5000404@cs.helsinki.fi>
Date:	Sun, 24 Feb 2008 04:49:18 +0200
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	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

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
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