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

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Message-ID: <20111014160110.GS14464@moon>
Date:	Fri, 14 Oct 2011 20:01:11 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kay Sievers <kay.sievers@...y.org>,
	linux-kernel@...r.kernel.org, lennart@...ttering.net,
	harald@...hat.com, david@...ar.dk, greg@...ah.com,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Menage <paul@...lmenage.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Pavel Emelyanov <xemul@...allels.com>
Subject: Re: A Plumber’s Wish List for Linux

On Fri, Oct 14, 2011 at 05:38:47PM +0200, Frederic Weisbecker wrote:
...
> 
> Well, wouldn't it be better to pull that complexity to userspace?
> After all, moving tasks from a cgroup to another is not a performance
> critical operation so that probably doesn't need to be all handled by
> the kernel.
> 
> If one worries about concurrent clone/fork while moving tasks, then
> freezing the cgroup and moving its tasks away from userspace could
> be enough?

Well, it's not that problem to make it task-by-task, still I think
it's just a convenient shortcut :)

	Cyrill
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