linux-kernel - Re: [PATCH v2 2/8] cgroup: document how cgroup IDs are assigned

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Date:	Wed, 24 Jul 2013 16:07:51 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.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 v2 2/8] cgroup: document how cgroup IDs are assigned

On Wed 24-07-13 17:59:55, Li Zefan wrote:
> As cgroup id has been used in netprio cgroup and will be used in memcg,
> it's important to make it clear how a cgroup id is allocated.
> 
> For example, in netprio cgroup, the id is used as index of an array.
> 
> Signed-off-by: Li Zefan <lizefan@...ei.com>

Reviewed-by: Michal Hocko <mhocko@...e.cz>

> ---
>  include/linux/cgroup.h | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
> index 2bd052d..8c107e9 100644
> --- a/include/linux/cgroup.h
> +++ b/include/linux/cgroup.h
> @@ -161,7 +161,13 @@ struct cgroup_name {
>  struct cgroup {
>  	unsigned long flags;		/* "unsigned long" so bitops work */
>  
> -	int id;				/* idr allocated in-hierarchy ID */
> +	/*
> +	 * idr allocated in-hierarchy ID.
> +	 *
> +	 * The ID of the root cgroup is always 0, and a new cgroup
> +	 * will be assigned with a smallest available ID.
> +	 */
> +	int id;
>  
>  	/*
>  	 * We link our 'sibling' struct into our parent's 'children'.
> -- 
> 1.8.0.2
> 
> --
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-- 
Michal Hocko
SUSE Labs
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