linux-kernel - Re: [RFC] [PATCH 2/2] cgroups: make procs file writable

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Message-ID: <20100603044001.GA21006@ghc02.ghc.andrew.cmu.edu>
Date:	Thu, 3 Jun 2010 00:40:02 -0400
From:	Ben Blum <bblum@...rew.cmu.edu>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Paul Menage <menage@...gle.com>, Ben Blum <bblum@...rew.cmu.edu>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, akpm@...ux-foundation.org,
	ebiederm@...ssion.com, lizf@...fujitsu.com, matthltc@...ibm.com
Subject: Re: [RFC] [PATCH 2/2] cgroups: make procs file writable

On Wed, Jun 02, 2010 at 10:58:55PM +0200, Oleg Nesterov wrote:
> Hmm. The usage of ->thread_group in ->can_attach() methods doesn't
> look safe to me... but currently bool threadgroup is always false.
> 
> Oleg.
> 
> 

I recall putting a rcu_read_lock() around that part and being assured
that made it safe. But I don't remember the details. Maybe taking
tasklist_lock is necessary?

-- Ben
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