From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966067AbXDCTVz (ORCPT ); Tue, 3 Apr 2007 15:21:55 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753635AbXDCTVz (ORCPT ); Tue, 3 Apr 2007 15:21:55 -0400 Received: from ogre.sisk.pl ([217.79.144.158]:60446 "EHLO ogre.sisk.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753626AbXDCTVy (ORCPT ); Tue, 3 Apr 2007 15:21:54 -0400 From: "Rafael J. Wysocki" To: ego@in.ibm.com Subject: Re: [RFC] Cpu-hotplug: Using the Process Freezer (try2) Date: Tue, 3 Apr 2007 21:25:13 +0200 User-Agent: KMail/1.9.5 Cc: Srivatsa Vaddagiri , Ingo Molnar , akpm@linux-foundation.org, paulmck@us.ibm.com, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, Oleg Nesterov , dipankar@in.ibm.com, dino@in.ibm.com, masami.hiramatsu.pt@hitachi.com References: <20070402053457.GA9076@in.ibm.com> <20070403125619.GA32444@in.ibm.com> <20070403141516.GB14900@in.ibm.com> In-Reply-To: <20070403141516.GB14900@in.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704032125.14742.rjw@sisk.pl> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday, 3 April 2007 16:15, Gautham R Shenoy wrote: > On Tue, Apr 03, 2007 at 06:26:19PM +0530, Srivatsa Vaddagiri wrote: > > > > Besides, how problematic is this in practise (that threads sleep for > > extended durations in TASK_INTERRUPTIBLE state breaking > > freezer/suspend/hotplug)? > > > > Should we ignore this for the timebeing and take up later as and when > > users report problems? > > In my case, the problem of freezer failing was due to the vfork freezer race > in do_fork. The parent task was waiting_for_completion() while the child was > frozen. > > Rafael has already sent out the fix for that, but for some reason I > don't see it in the -mm. Hm, freezer-fix-vfork-problem.patch is in -rc5-mm3. Is it the patch you're talking about or is there another one? Rafael