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mm: memcontrol: drain memcg stock on force_empty

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The per-cpu memcg stock can retain a charge of upto 32 pages.  On a
machine with large number of cpus, this can amount to a decent amount of
memory.  Additionally force_empty interface might be triggering unneeded
memcg reclaims.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Junaid Shahid <[email protected]>
Signed-off-by: Shakeel Butt <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Cc: Greg Thelen <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Junaid Shahid 2018-06-07 17:07:31 -07:00 • committed by Linus Torvalds
commit d12c60f64c
1 changed files with 3 additions and 0 deletions
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3
mm/memcontrol.c
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@ -2610,6 +2610,9 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
/* we call try-to-free pages for make this cgroup empty */
lru_add_drain_all();
drain_all_stock(memcg);
/* try to free all pages in this cgroup */
while (nr_retries && page_counter_read(&memcg->memory)) {
int progress;