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

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Message-Id: <20100804084523.768cd353.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 4 Aug 2010 08:45:23 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Ben Blum <bblum@...rew.cmu.edu>, 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 Tue, 3 Aug 2010 12:58:27 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> 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?
> 

I think the feature itself is good and useful. I welcome this.

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


> patch 2/2 looks very complicated.

yes. that's a concern.
I'd like to look deeper, today.

Thanks,
-Kame

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