From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1760460AbZEGIvt (ORCPT ); Thu, 7 May 2009 04:51:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755463AbZEGIvi (ORCPT ); Thu, 7 May 2009 04:51:38 -0400 Received: from mx2.mail.elte.hu ([157.181.151.9]:58196 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753925AbZEGIvh (ORCPT ); Thu, 7 May 2009 04:51:37 -0400 Date: Thu, 7 May 2009 10:51:16 +0200 From: Ingo Molnar To: Tim Bird , Peter Zijlstra Cc: Steven Rostedt , Frederic Weisbecker , Uwe =?iso-8859-1?Q?Kleine-K=F6nig?= , linux kernel , linux-arm-kernel Subject: Re: How to use a different sched_clock() for ftrace on omap? Message-ID: <20090507085116.GC19133@elte.hu> References: <4A022333.8030200@am.sony.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4A022333.8030200@am.sony.com> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Tim Bird wrote: > Hi all, > > I've worked up a replacement sched_clock for ftrace on my omap > platform. The current sched_clock, based on the 32K timer, has low > resolution and doesn't provide very useful results. hm, why dont you replace the real sched_clock() with it? High resolution sched_clock() gives (much!) better scheduling, better fairness, etc. Ingo