Subject: Re: [PATCH] x86: add the debugfs interface for the sysprof tool
From: Nicholas Miell <nmiell@comcast.net>
To: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Andrew Morton <akpm@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       mingo@elte.hu, sandmann@redhat.com, tglx@tglx.de, hpa@zytor.com
In-Reply-To: <47C0DB2E.5000404@cs.helsinki.fi>
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	 <47C0DB2E.5000404@cs.helsinki.fi>
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Date: Sat, 23 Feb 2008 19:12:27 -0800
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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@comcast.net>

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