[PATCH] mm: prevent page thrashing

[Minchan Kim]

No-Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
 mm/vmscan.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 671e47edb584..b258df552e3a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2143,6 +2143,25 @@ out:
 							denominator);
 				break;
 			case SCAN_FILE:
+				if (file && global_reclaim(sc)) {
+					unsigned long zonefile;
+					unsigned long zonefree;
+
+					zonefree = zone_page_state(zone,
+								NR_FREE_PAGES);
+					zonefile = zone_page_state(zone,
+							NR_ACTIVE_FILE) +
+							zone_page_state(zone,
+							NR_INACTIVE_FILE);
+
+					/* OOM is better than code thrashing */
+					if (zonefile + zonefree <=
+						high_wmark_pages(zone)) {
+						size = 0;
+						scan = 0;
+					}
+					break;
+				}
 			case SCAN_ANON:
 				/* Scan one type exclusively */
 				if ((scan_balance == SCAN_FILE) != file) {
-- 
1.9.1


-- 
Kind regards,
Minchan Kim
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