Date: Wed, 20 Feb 2008 10:39:40 -0800
From: Arjan van de Ven <arjan@infradead.org>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: 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
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	<1203531375.6243.52.camel@lappy>
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On Wed, 20 Feb 2008 19:16:15 +0100
Peter Zijlstra <a.p.zijlstra@chello.nl> wrote:

> 
> On Tue, 2008-02-19 at 12:37 -0800, Arjan van de Ven wrote:
> > From: Soren Sandmann <sandmann@redhat.com>
> > Subject: [PATCH] x86: add the debugfs interface for the sysprof tool
> > 
> > The sysprof tool is a very easy to use GUI tool to find out where
> > userspace is spending CPU time. See
> > http://www.daimi.au.dk/~sandmann/sysprof/
> > for more information and screenshots on this tool.
> > 
> > Sysprof needs a 200 line kernel module to do it's work, this
> > module puts some simple profiling data into debugfs.
> 
> What is the added value over oprofile?

it actually works and is usable by humans ;)

what oprofile doesn't do is the nice userland hierarchy of where cpu time is spend.
(and that is also what makes it mostly useless in practice)
> 


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