From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755006AbYJZOUv (ORCPT ); Sun, 26 Oct 2008 10:20:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754458AbYJZOUa (ORCPT ); Sun, 26 Oct 2008 10:20:30 -0400 Received: from casper.infradead.org ([85.118.1.10]:39677 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754014AbYJZOU3 (ORCPT ); Sun, 26 Oct 2008 10:20:29 -0400 Date: Sun, 26 Oct 2008 07:20:41 -0700 From: Arjan van de Ven To: Peter Zijlstra Cc: Steven Rostedt , LKML , Ingo Molnar , Thomas Gleixner , Arnaldo Carvalho de Melo , "Paul E. McKenney" , Andrew Morton , Linus Torvalds , Frederic Weisbecker Subject: Re: [PATCH v2][RFC] ftrace: function oprofiler Message-ID: <20081026072041.141b46ec@infradead.org> In-Reply-To: <1225017357.27415.5.camel@twins> References: <1225017357.27415.5.camel@twins> Organization: Intel X-Mailer: Claws Mail 3.5.0 (GTK+ 2.12.12; i386-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, 26 Oct 2008 11:35:57 +0100 Peter Zijlstra 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