linux-kernel - Re: [PATCH 2/3] cgroup: replace tasklist_lock with rcu_read

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Message-ID: <20120104103810.GA1143@somewhere>
Date:	Wed, 4 Jan 2012 11:38:18 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Mandeep Singh Baines <msb@...omium.org>
Cc:	Tejun Heo <tj@...nel.org>, Li Zefan <lizf@...fujitsu.com>,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, cgroups@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Paul Menage <paul@...lmenage.org>
Subject: Re: [PATCH 2/3] cgroup: replace tasklist_lock with rcu_read_lock

On Tue, Jan 03, 2012 at 09:18:31PM -0800, Mandeep Singh Baines wrote:
> We can replace the tasklist_lock in cgroup_attach_proc with an
> rcu_read_lock.
> 
> Changes in V4:
> * https://lkml.org/lkml/2011/12/23/284 (Frederic Weisbecker)
>   * Minimize size of rcu_read_lock critical section
>   * Add comment
> * https://lkml.org/lkml/2011/12/26/136 (Li Zefan)
>   * Split into two patches
> Changes in V3:
> * https://lkml.org/lkml/2011/12/22/419 (Frederic Weisbecker)
>   * Add an rcu_read_lock to protect against exit
> Changes in V2:
> * https://lkml.org/lkml/2011/12/22/86 (Tejun Heo)
>   * Use a goto instead of returning -EAGAIN
> 
> Suggested-by: Frederic Weisbecker <fweisbec@...il.com>
> Signed-off-by: Mandeep Singh Baines <msb@...omium.org>
> Cc: Tejun Heo <tj@...nel.org>
> Cc: Li Zefan <lizf@...fujitsu.com>
> Cc: containers@...ts.linux-foundation.org
> Cc: cgroups@...r.kernel.org
> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
> Cc: Oleg Nesterov <oleg@...hat.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Paul Menage <paul@...lmenage.org>

Acked-by: Frederic Weisbecker <fweisbec@...il.com>

Thanks!
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