Message-ID: <47C0DB2E.5000404@cs.helsinki.fi>
Date: Sun, 24 Feb 2008 04:49:18 +0200
From: Pekka Enberg <penberg@cs.helsinki.fi>
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To: Andrew Morton <akpm@linux-foundation.org>
CC: Arjan van de Ven <arjan@infradead.org>, linux-kernel@vger.kernel.org,
       mingo@elte.hu, sandmann@redhat.com, tglx@tglx.de, hpa@zytor.com
Subject: Re: [PATCH] x86: add the debugfs interface for the sysprof tool
References: <20080219123756.6261c13c@laptopd505.fenrus.org>	<20080223001130.d8922136.akpm@linux-foundation.org>	<84144f020802230351o24b11282vbb1cecf518d91825@mail.gmail.com> <20080223104611.a3430285.akpm@linux-foundation.org>
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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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