Re: [v8 PATCH 11/13] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers

On Tue, Feb 16, 2021 at 4:13 PM Yang Shi [off-list ref] wrote:

Now nr_deferred is available on per memcg level for memcg aware shrinkers, so don't need
allocate shrinker->nr_deferred for such shrinkers anymore.

The prealloc_memcg_shrinker() would return -ENOSYS if !CONFIG_MEMCG or memcg is disabled
by kernel command line, then shrinker's SHRINKER_MEMCG_AWARE flag would be cleared.
This makes the implementation of this patch simpler.

Acked-by: Vlastimil Babka <redacted>
Reviewed-by: Kirill Tkhai <redacted>
Acked-by: Roman Gushchin <redacted>
Signed-off-by: Yang Shi <redacted>

Reviewed-by: Shakeel Butt <redacted>