memcg: generate file modified notifications on "memory.events"
cgroup core only recently grew generic notification support. Wire up "memory.events" so that it triggers a file modified event whenever its content changes. v2: Refreshed on top of mem_cgroup relocation. Signed-off-by: NTejun Heo <tj@kernel.org> Acked-by: NMichal Hocko <mhocko@kernel.org> Acked-by: NJohannes Weiner <hannes@cmpxchg.org> Cc: Li Zefan <lizefan@huawei.com>
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