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SubjectRe: [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@huwei.com>

Reviewed-by: Michal Hocko <mhocko@suse.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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