linux-kernel - Re: [PATCH 0/4] Container Freezer: Reuse Suspend Freezer

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Message-Id: <1215640723.7149.35.camel@localhost.localdomain>
Date:	Wed, 09 Jul 2008 14:58:43 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Cedric Le Goater <clg@...ibm.com>,
	Linux Containers <containers@...ts.linux-foundation.org>,
	Linux-Kernel <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	linux-pm@...ts.linux-foundation.org
Subject: Re: [PATCH 0/4] Container Freezer: Reuse Suspend Freezer


On Tue, 2008-07-08 at 13:07 -0700, Paul Menage wrote:
> On Tue, Jul 8, 2008 at 1:06 PM, Paul Menage <menage@...gle.com> wrote:
> > On Tue, Jul 8, 2008 at 12:39 PM, Matt Helsley <matthltc@...ibm.com> wrote:
> >>
> >> One is to try and disallow users from moving frozen tasks. That doesn't
> >> seem like a good approach since it would require a new cgroups interface
> >> "can_detach()".
> >
> > Detaching from the old cgroup happens at the same time as attaching to
> > the new cgroup, so can_attach() would work here.

Update: I've made a patch implementing this. However it might be better
to just modify attach() to thaw the moving task rather than disallow
moving the frozen task. Serge, Cedric, Kame-san, do you have any
thoughts on which is more useful and/or intuitive?

> And the whole can_attach()/attach() protocol needs reworking anyway,
> see my email (hopefully) later today.
> 
> Paul

Interesting. I look forward to seeing this.

Cheers,
	-Matt

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