linux-kernel - Re: [uml-devel] [UM] Long loop in __getnsdayoftime() after resume from ram

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Message-ID: <5444DC3F.20601@nod.at>
Date:	Mon, 20 Oct 2014 11:56:15 +0200
From:	Richard Weinberger <richard@....at>
To:	Thomas Meyer <thomas@...3r.de>
CC:	user-mode-linux-devel <user-mode-linux-devel@...ts.sourceforge.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [uml-devel] [UM] Long loop in __getnsdayoftime() after resume
 from ram

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?

>> 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 <pid of a shell> >  /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

Thanks,
//richard
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