[PATCH v20 12/20] mm/vmscan: remove lruvec reget in move_pages_to_lru

[Alex Shi]

A isolated page shouldn't be recharged by memcg since the memcg
migration isn't possible at the time.
So remove unnecessary regetting.

Thanks to Alexander Duyck for pointing this out.

Signed-off-by: Alex Shi <alex.shi@xxxxxxxxxxxxxxxxx>
Acked-by: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Alexander Duyck <alexander.h.duyck@xxxxxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Konstantin Khlebnikov <khlebnikov@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
Cc: cgroups@xxxxxxxxxxxxxxx
---
 mm/vmscan.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 42bac12aacb4..845733afccde 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1887,7 +1887,8 @@ static unsigned noinline_for_stack move_pages_to_lru(struct lruvec *lruvec,
 			continue;
 		}
 
-		lruvec = mem_cgroup_page_lruvec(page, pgdat);
+		VM_BUG_ON_PAGE(mem_cgroup_page_lruvec(page, page_pgdat(page))
+							!= lruvec, page);
 		lru = page_lru(page);
 		nr_pages = thp_nr_pages(page);
 
-- 
1.8.3.1