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

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Message-ID: <ye8ejb3e8ef.fsf@camel10.daimi.au.dk>
Date:	23 Feb 2008 21:15:52 +0100
From:	Soeren Sandmann <sandmann@...mi.au.dk>
To:	John Levon <levon@...ementarian.org>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, tglx@...x.de, hpa@...or.com
Subject: Re: [PATCH] x86: add the debugfs interface for the sysprof tool

John Levon <levon@...ementarian.org> writes:

> Soren wrote sysprof when he tried an earlier version of oprofile and
> found it slightly non-obvious. Instead of doing any of these things:

This is not accurate. Sysprof started by me adding a hierarchical call
view to speedprof, a SIGPROF profiler which was basically a hack in
memprof.

Oprofile did not work on my system at the time (Red Hat 9, I believe),
and the website said that I had to apply a patch to the kernel and
recompile, so I didn't try it.

The hierarchical call view in speedprof worked out so well that I
wrote a simple kernel module to produce system-wide stacktraces, and
fed them into speedprof. Since speedprof was just a hack in memprof, I
wrote a new GUI, and sysprof was born.

It was only later I tried oprofile and found it not only much more
difficult to use, but also much less useful when I did get it to work.

Soren
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