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: NLi Zefan <lizefan@huwei.com> Reviewed-by: NMichal Hocko <mhocko@suse.cz> Signed-off-by: NTejun Heo <tj@kernel.org>
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