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mm: memcontrol: move obj_cgroup_uncharge_pages() out of css_set_lock 

The css_set_lock is used to guard the list of inherited objcgs.  So there
is no need to uncharge kernel memory under css_set_lock.  Just move it out
of the lock.

Link: https://lkml.kernel.org/r/20210417043538.9793-8-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Roman Gushchin <guro@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muchun Song 2021-06-28 19:38:06 -07:00 committed by Linus Torvalds
parent 9838354e16
commit 271dd6b1f6
1 changed files with 2 additions and 1 deletions
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mm/memcontrol.c
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@ -289,9 +289,10 @@ static void obj_cgroup_release(struct percpu_ref *ref)
WARN_ON_ONCE(nr_bytes & (PAGE_SIZE - 1));
nr_pages = nr_bytes >> PAGE_SHIFT;
spin_lock_irqsave(&css_set_lock, flags);
if (nr_pages)
obj_cgroup_uncharge_pages(objcg, nr_pages);
spin_lock_irqsave(&css_set_lock, flags);
list_del(&objcg->list);
spin_unlock_irqrestore(&css_set_lock, flags);