The patch titled
Subject: mm: memcontrol: move obj_cgroup_uncharge_pages() out of css_set_lock
has been removed from the -mm tree. Its filename was
mm-memcontrol-move-obj_cgroup_uncharge_pages-out-of-css_set_lock.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxx
Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Reviewed-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Roman Gushchin <guro@xxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Xiongchun Duan <duanxiongchun@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/memcontrol.c~mm-memcontrol-move-obj_cgroup_uncharge_pages-out-of-css_set_lock
+++ a/mm/memcontrol.c
@@ -289,9 +289,10 @@ static void obj_cgroup_release(struct pe
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);
_
Patches currently in -mm which might be from songmuchun@xxxxxxxxxxxxx are
