linux-kernel - Re: [PATCH 09/11] memcg: propagate kmem limiting information to children

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Message-Id: <20120625162352.51997c5a.akpm@linux-foundation.org>
Date:	Mon, 25 Jun 2012 16:23:52 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Glauber Costa <glommer@...allels.com>
Cc:	<cgroups@...r.kernel.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Christoph Lameter <cl@...ux.com>, <devel@...nvz.org>,
	<kamezawa.hiroyu@...fujitsu.com>, Tejun Heo <tj@...nel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Suleiman Souhlal <suleiman@...gle.com>
Subject: Re: [PATCH 09/11] memcg: propagate kmem limiting information to
 children

On Mon, 25 Jun 2012 18:15:26 +0400
Glauber Costa <glommer@...allels.com> wrote:

> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -287,7 +287,11 @@ struct mem_cgroup {
>  	 * Should the accounting and control be hierarchical, per subtree?
>  	 */
>  	bool use_hierarchy;
> -	bool kmem_accounted;
> +	/*
> +	 * bit0: accounted by this cgroup
> +	 * bit1: accounted by a parent.
> +	 */
> +	volatile unsigned long kmem_accounted;

I suggest

	unsigned long kmem_accounted;	/* See KMEM_ACCOUNTED_*, below */

>  	bool		oom_lock;
>  	atomic_t	under_oom;
> @@ -340,6 +344,9 @@ struct mem_cgroup {
>  #endif
>  };
>  
> +#define KMEM_ACCOUNTED_THIS	0
> +#define KMEM_ACCOUNTED_PARENT	1

And then document the fields here.
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