From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758466AbZA2XiQ (ORCPT ); Thu, 29 Jan 2009 18:38:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752213AbZA2Xh7 (ORCPT ); Thu, 29 Jan 2009 18:37:59 -0500 Received: from smtp1.linux-foundation.org ([140.211.169.13]:59236 "EHLO smtp1.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751931AbZA2Xh6 (ORCPT ); Thu, 29 Jan 2009 18:37:58 -0500 Date: Thu, 29 Jan 2009 15:37:09 -0800 From: Andrew Morton To: Ingo Molnar , Peter Zijlstra , Mike Galbraith , Gregory Haskins Cc: linux-kernel@vger.kernel.org Subject: sched behaviour (was: Re: linux-next: Tree for January 26) Message-Id: <20090129153709.f368625e.akpm@linux-foundation.org> In-Reply-To: <20090126192349.1804bc27.sfr@canb.auug.org.au> References: <20090126192349.1804bc27.sfr@canb.auug.org.au> X-Mailer: Sylpheed version 2.2.4 (GTK+ 2.8.20; i486-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 26 Jan 2009 19:23:49 +1100 Stephen Rothwell wrote: > I have created today's linux-next tree at > git://git.kernel.org/pub/scm/linux/kernel/git/sfr/linux-next.git The machine is 8-way x86_64. In one window it is running `make -j32 vmlinux'. In another window I run the `fpatch' command. fpatch is a scruffy shell script from http://userweb.kernel.org/~akpm/stuff/patch-scripts.tar.gz which does a few mv's, cp's, etc. current mainline: akpm2:/usr/src/25> time fpatch b kernel/sched.c fpatch b kernel/sched.c 0.02s user 0.09s system 33% cpu 0.338 total Jan 26 linux-next: akpm2:/usr/src/25> time fpatch b kernel/sched.c fpatch b kernel/sched.c 0.02s user 0.05s system 0% cpu 32.739 total Machine basically unusable, user unhappy! I'm assuming it's a scheduler problem - everything is in pagecache.