From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-ID: <1413832768.2991.39.camel@localhost.localdomain> From: Thomas Meyer 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" Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Subject: Re: [uml-devel] [UM] Long loop in __getnsdayoftime() after resume from ram To: Richard Weinberger Cc: Linux Kernel Mailing List , user-mode-linux-devel List-ID: 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