Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756085AbXIJJpj (ORCPT ); Mon, 10 Sep 2007 05:45:39 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1750866AbXIJJp2 (ORCPT ); Mon, 10 Sep 2007 05:45:28 -0400 Received: from ecfrec.frec.bull.fr ([129.183.4.8]:46722 "EHLO ecfrec.frec.bull.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752393AbXIJJp0 (ORCPT ); Mon, 10 Sep 2007 05:45:26 -0400 Date: Mon, 10 Sep 2007 11:45:10 +0200 (CEST) From: Simon Derr X-X-Sender: derrs@frecb006381.adech.frec.bull.fr To: Nicolas Capit Cc: linux-kernel@vger.kernel.org, Paul Jackson Subject: Re: cpuset trouble after hibernate In-Reply-To: <20070908204438.3bf03d85@localhost.localdomain> Message-ID: References: <20070908204438.3bf03d85@localhost.localdomain> MIME-Version: 1.0 X-MIMETrack: Itemize by SMTP Server on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 10/09/2007 11:51:01, Serialize by Router on ECN002/FR/BULL(Release 5.0.12 |February 13, 2003) at 10/09/2007 11:51:03, Serialize complete at 10/09/2007 11:51:03 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1061 Lines: 38 On Sat, 8 Sep 2007, Nicolas Capit wrote: > Hello, > > This is my situation: > - I mounted the pseudo cpuset filesystem into /dev/cpuset > - I created a cpuset named oar with my 2 cpus > > cat /dev/cpuset/oar/cpus > 0-1 > > - Then I hibernate my computer with 'echo -n "disk" >/sys/power/state' > - After reboot: > > cat /dev/cpuset/oar/cpus > 0 > > Why did I lost a cpu? > Is this a normal behavior??? Hi Nicolas, I believe this is related to the fact that hibernation uses the hotplug subsystem to disable all CPUs except the boot CPU. Thus guarantee_online_cpus() is called on each cpuset and removes all CPUs, except CPU 0, from all cpusets. I'm not quite sure about if/how this should be fixed in the kernel, though. Looks like a very simple user-land workaround would be enough. Simon. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/