linux-kernel - Re: [PATCH 05/17] cgroup: cgroup->dentry isn't a RCU pointer

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Message-ID: <50A45ABB.3040507@parallels.com>
Date:	Thu, 15 Nov 2012 07:00:11 +0400
From:	Glauber Costa <glommer@...allels.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<lizefan@...wei.com>, <containers@...ts.linux-foundation.org>,
	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<mhocko@...e.cz>
Subject: Re: [PATCH 05/17] cgroup: cgroup->dentry isn't a RCU pointer

On 11/14/2012 10:55 PM, Tejun Heo wrote:
> Hello, Glauber.
> 
> On Wed, Nov 14, 2012 at 03:05:46PM +0400, Glauber Costa wrote:
>> Will memcontrol.c need similar amendments?
>>
>> The code that lives in -mm and includes kmemcg includes the following
>> excerpt:
>>
>>         rcu_read_lock();
>>         dentry = rcu_dereference(memcg->css.cgroup->dentry);
>>         rcu_read_unlock();
> 
> Ooh, yeah, hmmm... that should happen after this series gets merged.
> I'll mark it as pending.
> 
> Thanks.
> 
Btw: I did this because there is no other facility to figure out a
memcg's "name".

I wonder if there is anyone else using this, so we could just abstract
that in cgroup.c?

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