[-mm][PATCH 7/10] prevent incorrect oom under split_lru

[KOSAKI Motohiro]

if zone->recent_scanned parameter become inbalanceing anon and file,
OOM killer can happened although swappable page exist.

So, if priority==0, We should try to reclaim all page for prevent OOM.


Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>

---
 mm/vmscan.c |    6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

Index: b/mm/vmscan.c
===================================================================
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1460,8 +1460,10 @@ static unsigned long shrink_zone(int pri
 			 * kernel will slowly sift through each list.
 			 */
 			scan = zone_page_state(zone, NR_LRU_BASE + l);
-			scan >>= priority;
-			scan = (scan * percent[file]) / 100;
+			if (priority) {
+				scan >>= priority;
+				scan = (scan * percent[file]) / 100;
+			}
 			zone->lru[l].nr_scan += scan + 1;
 			nr[l] = zone->lru[l].nr_scan;
 			if (nr[l] >= sc->swap_cluster_max)


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