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

[Michal Hocko]

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@xxxxxxxxx>

Reviewed-by: Michal Hocko <mhocko@xxxxxxx>

> ---
>  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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