linux-kernel - Re: [PATCH v2][RFC] ftrace: function oprofiler

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Message-ID: <20081026072041.141b46ec@infradead.org>
Date:	Sun, 26 Oct 2008 07:20:41 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH v2][RFC] ftrace: function oprofiler

On Sun, 26 Oct 2008 11:35:57 +0100
Peter Zijlstra <peterz@...radead.org> wrote:

> On Sat, 2008-10-25 at 20:55 -0400, Steven Rostedt wrote:
> 
> > This is a function profiler to count the number of times a function
> > is hit.
> 
> I have to ask, _why_?
> 
> It seems like a nice enough gimmick, but is this information actually
> useful?

yes.

If you are diagnosing "my system suddenly became slow", and if you have
a baseline, a fingerprint like this can be used by less-trained people
to look up the next steps in the diagnostics.



-- 
Arjan van de Ven 	Intel Open Source Technology Centre
For development, discussion and tips for power savings, 
visit http://www.lesswatts.org
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