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

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Date:	Wed, 20 Feb 2008 11:26:55 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	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

On Wed, 20 Feb 2008 19:53:42 +0100
Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:

> 
> On Wed, 2008-02-20 at 10:39 -0800, Arjan van de Ven wrote:
> > On Wed, 20 Feb 2008 19:16:15 +0100
> > Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > 
> > > 
> > > On Tue, 2008-02-19 at 12:37 -0800, Arjan van de Ven wrote:
> > > > From: Soren Sandmann <sandmann@...hat.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 ;)
> 
> # sysprof
> 
> (sysprof:12480): Gtk-WARNING **: cannot open display:
> 
> -ENOX
> 
> > 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)
> 
> so why not fix oprofile callgraph output and build a GUI on top of
> oprofile for those of us who really want RSI from mouse movement :-)

feel free to reinvent a whole GUI just to avoid a 200 line kernel module.
sysprof is here. it works. the gui is REALLY nice.
I think it's the wrong tradeoff though... oprofile exists for how long?


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