From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932368AbXCKVGc (ORCPT ); Sun, 11 Mar 2007 17:06:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932403AbXCKVGc (ORCPT ); Sun, 11 Mar 2007 17:06:32 -0400 Received: from www17.your-server.de ([213.133.104.17]:2297 "EHLO www17.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932368AbXCKVGb (ORCPT ); Sun, 11 Mar 2007 17:06:31 -0400 Message-ID: <45F46E7F.8020703@m3y3r.de> Date: Sun, 11 Mar 2007 22:02:55 +0100 From: Thomas Meyer User-Agent: Thunderbird 1.5.0.10 (X11/20070302) MIME-Version: 1.0 To: Milan Broz CC: "Rafael J. Wysocki" , linux-kernel@vger.kernel.org, Pavel Machek , Thomas Gleixner Subject: Re: SwSusp to disk doesn't work - Try 2 References: <45F44599.3060508@m3y3r.de> <200703112038.52375.rjw@sisk.pl> <45F46530.8050005@redhat.com> <200703112132.32753.rjw@sisk.pl> <45F46660.4010102@m3y3r.de> <45F46D33.1050808@redhat.com> In-Reply-To: <45F46D33.1050808@redhat.com> Content-Type: text/plain; charset=ISO-8859-15; format=flowed Content-Transfer-Encoding: 7bit X-Authenticated-Sender: thomas@m3y3r.de Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Milan Broz schrieb: > Thomas Meyer napsal(a): > >> Rafael J. Wysocki schrieb: >> >>> On Sunday, 11 March 2007 21:23, Milan Broz wrote: >>> >>> >>>> Rafael J. Wysocki: >>>> >>>> >>>>> Ah, NO_HZ. Thomas Gleixner's address added to the Cc list. >>>>> >>>>> >>>>> >>>>>> short printk trace >>>>>> >>>>>> enable_nonboot_cpus >>>>>> _cpu_up >>>>>> raw_notifier_callchain (CPU_UP_PREPARE) >>>>>> ... >>>>>> update_sched_domains >>>>>> detach_destroy_domains >>>>>> [waits here] --> synchronize_sched (==synchronize_rcu) >>>>>> >>>>>> >>>>> Well, I think the call to wait_for_completion() does not return, probably >>>>> because the task supposed to complete the completion is frozen at this >>>>> point. Can you please try to confirm that it gets stuck on >>>>> wait_for_completion() in synchronize_rcu()? >>>>> >>>>> >>>> Yes, it's in wait_for_completion() in synchronize_rcu(). >>>> As noted in some previous mail, it will wake up after >>>> event - key press etc. >>>> >>>> Patch in http://lkml.org/lkml/2007/3/7/255 solves different problem. >>>> I added it to my quilt and applied anyway -> no change. >>>> >>>> >>> Does the problem go away if NO_HZ is unset? >>> >>> >> i tried to boot with nohz=off, but the problem did persist. >> > > Hmmmm, both variants (nohz=off or recompiled kernel without NO_HZ) works for me. > > Milan > I got a working config: Without hrtimers and without nohz it is working! With hrtimers and without nohz it is not working With hrtimers and with nohz it is not working Now i want to test: without hrtimers and with nohz.