linux-kernel - Re: [PATCH 6/8] memcg: fail to create cgroup if the cgroup id is too big

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Message-ID: <20130408150117.GN17178@dhcp22.suse.cz>
Date:	Mon, 8 Apr 2013 17:01:17 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	Glauber Costa <glommer@...allels.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Cgroups <cgroups@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 6/8] memcg: fail to create cgroup if the cgroup id is too
 big

On Mon 08-04-13 16:22:34, Li Zefan wrote:
> memcg requires the cgroup id to be smaller than 65536.
> 
> Signed-off-by: Li Zefan <lizefan@...wei.com>

But this should be moved up the patch stack as mentioned in the previous
email.

Acked-by: Michal Hocko <mhocko@...e.cz>
Minor nit bellow.

> ---
>  mm/memcontrol.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index c4e0173..947dff1 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -492,6 +492,12 @@ static inline bool mem_cgroup_is_root(struct mem_cgroup *memcg)
>  	return (memcg == root_mem_cgroup);
>  }
>  
> +/*
> + * We restrict the id in the range of [0, 65535], so it can fit into
> + * an unsigned short.
> + */
> +#define MEM_CGROUP_ID_MAX	(65535)

USHRT_MAX ?

> +
>  static inline unsigned short mem_cgroup_id(struct mem_cgroup *memcg)
>  {
>  	return memcg->css.cgroup->id;
-- 
Michal Hocko
SUSE Labs
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