[PATCH 07/14] lru/swap: using per lruvec lock in page_cache_release

[Alex Shi]

Also cares the lruvec->pgdat syncing.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Jason Gunthorpe <jgg@xxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Cc: Peng Fan <peng.fan@xxxxxxx>
Cc: Nikolay Borisov <nborisov@xxxxxxxx>
Cc: Ira Weiny <ira.weiny@xxxxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: cgroups@xxxxxxxxxxxxxxx
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
---
 mm/swap.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mm/swap.c b/mm/swap.c
index 63f4782af57a..2a8fe6df08fc 100644
--- a/mm/swap.c
+++ b/mm/swap.c
@@ -63,12 +63,13 @@ static void __page_cache_release(struct page *page)
 		struct lruvec *lruvec;
 		unsigned long flags;
 
-		spin_lock_irqsave(&pgdat->lruvec.lru_lock, flags);
 		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		spin_lock_irqsave(&lruvec->lru_lock, flags);
+		sync_lruvec_pgdat(lruvec, pgdat);
 		VM_BUG_ON_PAGE(!PageLRU(page), page);
 		__ClearPageLRU(page);
 		del_page_from_lru_list(page, lruvec, page_off_lru(page));
-		spin_unlock_irqrestore(&pgdat->lruvec.lru_lock, flags);
+		spin_unlock_irqrestore(&lruvec->lru_lock, flags);
 	}
 	__ClearPageWaiters(page);
 	mem_cgroup_uncharge(page);
-- 
1.8.3.1