linux-kernel - Re: A Plumber’s Wish List for Linux

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Message-ID: <20111007123521.GB9452@redhat.com>
Date:	Fri, 7 Oct 2011 08:35:21 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel@...r.kernel.org, lennart@...ttering.net,
	harald@...hat.com, david@...ar.dk, greg@...ah.com
Subject: Re: A Plumber’s Wish List for Linux

On Fri, Oct 07, 2011 at 01:17:02AM +0200, Kay Sievers wrote:

[..]
> * fork throttling mechanism as basic cgroup functionality that is
> available in all hierarchies independent of the controllers used:
> This is important to implement race-free killing of all members of a
> cgroup, so that cgroup member processes cannot fork faster then a cgroup
> supervisor process could kill them. This needs to be recursive, so that
> not only a cgroup but all its subgroups are covered as well.

Above should make sense for "freezer" controller too. That will allow us
reliable dynamic migration of tasks in a cgroup by first freezing them,
then change the cgroup and then unfreeze.

Thanks
Vivek
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