From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751995AbaJTTTc (ORCPT ); Mon, 20 Oct 2014 15:19:32 -0400 Received: from www17.your-server.de ([213.133.104.17]:55741 "EHLO www17.your-server.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751176AbaJTTTa (ORCPT ); Mon, 20 Oct 2014 15:19:30 -0400 Message-ID: <1413832768.2991.39.camel@localhost.localdomain> Subject: Re: [uml-devel] [UM] Long loop in __getnsdayoftime() after resume from ram From: Thomas Meyer To: Richard Weinberger Cc: Linux Kernel Mailing List , user-mode-linux-devel Date: Mon, 20 Oct 2014 21:19:28 +0200 In-Reply-To: <5444DC3F.20601@nod.at> References: <5444DC3F.20601@nod.at> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.10.4 (3.10.4-4.fc20) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Authenticated-Sender: thomas@m3y3r.de Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Am Montag, den 20.10.2014, 11:56 +0200 schrieb Richard Weinberger: > Am 20.10.2014 um 11:51 schrieb Thomas Meyer: > >> Hmm, does this always happen? > > > > Yes, my single core system seems to trigger this every time after resume from ram. > > What is your host kernel? The standard Fedora kernel: 3.16.4-200.fc20.x86_64 > > >> At least on my notebook it did not happen. I've started an UML yesterday > >> suspended it and after more than 12h it worked fine today. > >> > >> BTW: Do you see the issue also then freezing UML using the freezer cgroup? > > > > I'm not sure what do you mean by this. Do I need to enable some special configs for this in the host or uml kernel? > > Create on the host side a new freezer cgroup, put UML into it and freeze/thaw it. > i.e. mkdir /sys/fs/cgroup/freezer/uml ; echo > /sys/fs/cgroup/freezer/uml/tasks. > In the said shell run UML and then freeze it using echo FROZEN > /sys/fs/cgroup/freezer/uml/freezer.state. > Later thaw it: echo THAWED > /sys/fs/cgroup/freezer/uml/freezer.state > I'll try this. Thanks for this tip. with kind regards thomas