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-rw-r--r--mm/vmscan.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 8277f93148b5..f8b94ea6f722 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1596,6 +1596,14 @@ int zone_reclaim_mode __read_mostly;
* Mininum time between zone reclaim scans
*/
#define ZONE_RECLAIM_INTERVAL 30*HZ
+
+/*
+ * Priority for ZONE_RECLAIM. This determines the fraction of pages
+ * of a node considered for each zone_reclaim. 4 scans 1/16th of
+ * a zone.
+ */
+#define ZONE_RECLAIM_PRIORITY 4
+
/*
* Try to free up some pages from this zone through reclaim.
*/
@@ -1626,7 +1634,7 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
sc.may_swap = 0;
sc.nr_scanned = 0;
sc.nr_reclaimed = 0;
- sc.priority = 0;
+ sc.priority = ZONE_RECLAIM_PRIORITY + 1;
sc.nr_mapped = read_page_state(nr_mapped);
sc.gfp_mask = gfp_mask;
@@ -1643,7 +1651,15 @@ int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;
- shrink_zone(zone, &sc);
+ /*
+ * Free memory by calling shrink zone with increasing priorities
+ * until we have enough memory freed.
+ */
+ do {
+ sc.priority--;
+ shrink_zone(zone, &sc);
+
+ } while (sc.nr_reclaimed < nr_pages && sc.priority > 0);
p->reclaim_state = NULL;
current->flags &= ~PF_MEMALLOC;