[PATCH v9 11/20] mm/memcg: move SetPageLRU out of lru_lock in commit_charge

[Alex Shi]

Since lru lock doesn't defense PageLRU anymore, move the setting out of
lock may save a bit lock contention time.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Vladimir Davydov <vdavydov.dev@xxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: cgroups@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 mm/memcontrol.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index f8419f3436a8..7d7b861a948c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2614,9 +2614,9 @@ static void commit_charge(struct page *page, struct mem_cgroup *memcg,
 		lruvec = mem_cgroup_page_lruvec(page, pgdat);
 
 		VM_BUG_ON_PAGE(PageLRU(page), page);
-		SetPageLRU(page);
 		add_page_to_lru_list(page, lruvec, page_lru(page));
 		spin_unlock_irq(&pgdat->lru_lock);
+		SetPageLRU(page);
 	}
 }
 
-- 
1.8.3.1