linux-kernel - Re: [PATCH v4 0/2] cgroups: implement moving a threadgroup's threads atomically with cgroup.procs

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Message-Id: <20100803125827.0822e6ab.akpm@linux-foundation.org>
Date:	Tue, 3 Aug 2010 12:58:27 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ben Blum <bblum@...rew.cmu.edu>
Cc:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, ebiederm@...ssion.com,
	lizf@...fujitsu.com, matthltc@...ibm.com, menage@...gle.com,
	oleg@...hat.com
Subject: Re: [PATCH v4 0/2] cgroups: implement moving a threadgroup's
 threads atomically with cgroup.procs

On Fri, 30 Jul 2010 19:56:49 -0400
Ben Blum <bblum@...rew.cmu.edu> wrote:

> This patch series implements a write function for the 'cgroup.procs'
> per-cgroup file, which enables atomic movement of multithreaded
> applications between cgroups. Writing the thread-ID of any thread in a
> threadgroup to a cgroup's procs file causes all threads in the group to
> be moved to that cgroup safely with respect to threads forking/exiting.
> (Possible usage scenario: If running a multithreaded build system that
> sucks up system resources, this lets you restrict it all at once into a
> new cgroup to keep it under control.)

I can see how that would be useful.  No comments from anyone else?

patch 1/2 makes me cry with all those ifdefs.  Maybe helper functions
would help, but not a lot.

patch 2/2 looks very complicated.
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