1 files changed, 37 insertions, 1 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index e5245d051647..9673437a5457 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1351,12 +1351,48 @@ static int inactive_anon_is_low(struct zone *zone, struct scan_control *sc)
         return low;
 }
 
+static int inactive_file_is_low_global(struct zone *zone)
+{
+        unsigned long active, inactive;
+
+        active = zone_page_state(zone, NR_ACTIVE_FILE);
+        inactive = zone_page_state(zone, NR_INACTIVE_FILE);
+
+        return (active > inactive);
+}
+
+/**
+ * inactive_file_is_low - check if file pages need to be deactivated
+ * @zone: zone to check
+ * @sc:   scan control of this context
+ *
+ * When the system is doing streaming IO, memory pressure here
+ * ensures that active file pages get deactivated, until more
+ * than half of the file pages are on the inactive list.
+ *
+ * Once we get to that situation, protect the system's working
+ * set from being evicted by disabling active file page aging.
+ *
+ * This uses a different ratio than the anonymous pages, because
+ * the page cache uses a use-once replacement algorithm.
+ */
+static int inactive_file_is_low(struct zone *zone, struct scan_control *sc)
+{
+        int low;
+
+        if (scanning_global_lru(sc))
+                low = inactive_file_is_low_global(zone);
+        else
+                low = mem_cgroup_inactive_file_is_low(sc->mem_cgroup);
+        return low;
+}
+
 static unsigned long shrink_list(enum lru_list lru, unsigned long nr_to_scan,
         struct zone *zone, struct scan_control *sc, int priority)
 {
         int file = is_file_lru(lru);
 
-        if (lru == LRU_ACTIVE_FILE) {
+        if (lru == LRU_ACTIVE_FILE && inactive_file_is_low(zone, sc)) {
                 shrink_active_list(nr_to_scan, zone, sc, priority, file);
                 return 0;
         }