Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758356AbXIOIJe (ORCPT ); Sat, 15 Sep 2007 04:09:34 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753341AbXIOIJU (ORCPT ); Sat, 15 Sep 2007 04:09:20 -0400 Received: from smtp2.linux-foundation.org ([207.189.120.14]:44294 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752912AbXIOIJR (ORCPT ); Sat, 15 Sep 2007 04:09:17 -0400 Date: Sat, 15 Sep 2007 01:08:07 -0700 From: Andrew Morton To: Simon Derr Cc: Nicolas Capit , linux-kernel@vger.kernel.org, Paul Jackson , "Serge E. Hallyn" , Paul Menage , Balbir Singh Subject: Re: cpuset trouble after hibernate Message-Id: <20070915010807.b0055e7e.akpm@linux-foundation.org> In-Reply-To: References: <20070908204438.3bf03d85@localhost.localdomain> X-Mailer: Sylpheed 2.4.1 (GTK+ 2.8.17; x86_64-unknown-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1319 Lines: 43 On Mon, 10 Sep 2007 11:45:10 +0200 (CEST) Simon Derr wrote: > 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. > Yeah. Bug, surely. But I guess it's always been there. What are the implications of this for cpusets-via-containers? - 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/