From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764778AbXGYH2E (ORCPT ); Wed, 25 Jul 2007 03:28:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755483AbXGYH1x (ORCPT ); Wed, 25 Jul 2007 03:27:53 -0400 Received: from mx3.mail.elte.hu ([157.181.1.138]:39221 "EHLO mx3.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755123AbXGYH1w (ORCPT ); Wed, 25 Jul 2007 03:27:52 -0400 Date: Wed, 25 Jul 2007 09:27:00 +0200 From: Ingo Molnar To: =?iso-8859-1?Q?S=E9bastien_Dugu=E9?= Cc: Linux RT Users , linux-kernel , Thomas Gleixner , Jean Pierre Dion , Darren Hart , john stultz , Josh Triplett Subject: Re: [PATCH RT] Fix RT balancing tasks pulling Message-ID: <20070725072700.GC26955@elte.hu> References: <20070724154202.224f12e8@frecb000686.frec.bull.fr> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20070724154202.224f12e8@frecb000686.frec.bull.fr> User-Agent: Mutt/1.5.14 (2007-02-12) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.0 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.0 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.1.7-deb -1.0 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Sébastien Dugué wrote: > Hi Ingo, Thomas, > > this one-liner fixes a bug in balance_rt_tasks() which sometimes > manifests by having a lower prio task being scheduled while a higher > prio task is sitting waiting on another runqueue. > > This is pretty hard to reproduce on low cpu count machines, for > example, I had to have sched_football run in a loop for ~38h before it > failed on a dual HT Xeon box. really nice catch! Applied. Ingo