memcg: rename cgroup_event to mem_cgroup_event
cgroup_event is only available in memcg now. Let's brand it that way. While at it, add a comment encouraging deprecation of the feature and remove the respective section from cgroup documentation. This patch is cosmetic. v3: Typo update as per Li Zefan. v2: Index in cgroups.txt updated accordingly as suggested by Li Zefan. Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NLi Zefan <lizefan@huawei.com> Acked-by: NKirill A. Shutemov <kirill.shutemov@linux.intel.com> Acked-by: NMichal Hocko <mhocko@suse.cz>
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