cgroup: document how cgroup IDs are assigned
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 anarray. Signed-off-by: Li Zefan <lizefan@huwei.com> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Tejun Heo <tj@kernel.org>
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@ -161,7 +161,13 @@ struct cgroup_name {
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struct cgroup {
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unsigned long flags; /* "unsigned long" so bitops work */
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int id; /* idr allocated in-hierarchy ID */
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/*
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* idr allocated in-hierarchy ID.
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*
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* The ID of the root cgroup is always 0, and a new cgroup
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* will be assigned with a smallest available ID.
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*/
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int id;
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/*
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* We link our 'sibling' struct into our parent's 'children'.
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