mm: shrinkers: make count and scan in shrinker debugfs lockless

Like global and memcg slab shrink, also use SRCU to make count and scan
operations in memory shrinker debugfs lockless.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Qi Zheng <[email protected]>
Acked-by: Vlastimil Babka <[email protected]>
Acked-by: Kirill Tkhai <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Cc: Christian König <[email protected]>
Cc: David Hildenbrand <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Muchun Song <[email protected]>
Cc: Paul E. McKenney <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Sultan Alsawaf <[email protected]>
Cc: Tetsuo Handa <[email protected]>
Cc: Yang Shi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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