From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756309AbXJZJF4 (ORCPT ); Fri, 26 Oct 2007 05:05:56 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752777AbXJZJFt (ORCPT ); Fri, 26 Oct 2007 05:05:49 -0400 Received: from mail.gmx.net ([213.165.64.20]:41132 "HELO mail.gmx.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1750927AbXJZJFs (ORCPT ); Fri, 26 Oct 2007 05:05:48 -0400 X-Authenticated: #14349625 X-Provags-ID: V01U2FsdGVkX1/NfAUVUfbNmBC1jTIdsE1jOPe0d2bVhttcxh/FXh mjl1/HA1ngktw8 Subject: Re: kernel 2.6.23 CFS problem? From: Mike Galbraith To: "Wang, Baojun" Cc: linux-kernel@vger.kernel.org In-Reply-To: <200710261532.22265.wangbj@lzu.edu.cn> References: <200710261057.48179.wangbj@lzu.edu.cn> <20071026044502.GB2458@hacking> <393381760.18886@lzu.edu.cn> <200710261532.22265.wangbj@lzu.edu.cn> Content-Type: text/plain Date: Fri, 26 Oct 2007 11:05:42 +0200 Message-Id: <1193389542.7701.18.camel@Homer.simpson.net> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2 Content-Transfer-Encoding: 7bit X-Y-GMX-Trusted: 0 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2007-10-26 at 15:32 +0800, Wang, Baojun wrote: > > Perhaps he has any tasks stuck in 'D' state? If so, SysRq-t output for > > these would be a good thing to collect. What leads him to suspect the > > process scheduler, etc. More details are needed. > The task is S+ state, please see in the attachment tarball, SysRq-t output has > also been attached, I wish it would help. I doubt it's the CFS problem > because it's first introduced into the 2.6.23 kernel. (yeah, but there were a truckload of other changes as well) Looking at your data, _my_ first suspect would be the 2.6.22->2.6.23 futex changes. I'd revert all of the changes to kernel/futex.c and kernel/futex_compat.c, and see if the problem went away. If it didn't, I'd then do a full git bisect to nail it down. -Mike