linux-kernel - Re: [PATCH 0/2] CGroups: cgroup member list enhancement/fix

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Date:	Tue, 14 Jul 2009 11:26:38 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Paul Menage <menage@...gle.com>
Cc:	lizf@...fujitzu.com, bblum@...gle.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	containers@...ts.linux-foundation.org,
	libcg-devel <libcg-devel@...ts.sourceforge.net>
Subject: Re: [PATCH 0/2] CGroups: cgroup member list enhancement/fix

* menage@...gle.com <menage@...gle.com> [2009-07-13 09:26:26]:

> On Mon, Jul 13, 2009 at 5:11 AM, Balbir Singh<balbir@...ux.vnet.ibm.com> wrote:
> >
> > How about lazy migration? Mark a group as to move when the kernel sees
> > it next for scheduling.
> 
> Waiting for the next scheduling point might be too long, since a
> thread can block for arbitrary amounts of time and keeping the marker
> around for arbitrary time (unless we add a new task_struct field)
> would be tricky. Marking the cgroup or tgid as being migrated which
> then triggers the extra synchronization in the fork path (but which
> isn't needed at other times) is probably where we'll end up.


Hmm... but we would not need that information till we schedule the
tasks, adding a field to task_struct is what I had in mind.

-- 
	Balbir
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