3 files changed, 26 insertions, 5 deletions

diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 34cbefd2ebde..93a849f742db 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -149,15 +149,17 @@ struct zone {
         unsigned long           pages_scanned;     /* since last reclaim */
         int                     all_unreclaimable; /* All pages pinned */
 
-        /*
-         * Does the allocator try to reclaim pages from the zone as soon
-         * as it fails a watermark_ok() in __alloc_pages?
-         */
-        int                     reclaim_pages;
         /* A count of how many reclaimers are scanning this zone */
         atomic_t                reclaim_in_progress;
 
         /*
+         * timestamp (in jiffies) of the last zone reclaim that did not
+         * result in freeing of pages. This is used to avoid repeated scans
+         * if all memory in the zone is in use.
+         */
+        unsigned long           last_unsuccessful_zone_reclaim;
+
+        /*
          * prev_priority holds the scanning priority for this zone.  It is
          * defined as the scanning priority at which we achieved our reclaim
          * target at the previous try_to_free_pages() or balance_pgdat()
diff --git a/include/linux/swap.h b/include/linux/swap.h
index d01f7efb0f2c..4a99e4a7fbf3 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -176,6 +176,17 @@ extern int try_to_free_pages(struct zone **, gfp_t);
 extern int shrink_all_memory(int);
 extern int vm_swappiness;
 
+#ifdef CONFIG_NUMA
+extern int zone_reclaim_mode;
+extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
+#else
+#define zone_reclaim_mode 0
+static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order)
+{
+        return 0;
+}
+#endif
+
 #ifdef CONFIG_MIGRATION
 extern int isolate_lru_page(struct page *p);
 extern int putback_lru_pages(struct list_head *l);
diff --git a/include/linux/topology.h b/include/linux/topology.h
index 315a5163d6a0..e8eb0040ce3a 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -56,6 +56,14 @@
 #define REMOTE_DISTANCE         20
 #define node_distance(from,to)  ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
 #endif
+#ifndef RECLAIM_DISTANCE
+/*
+ * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
+ * (in whatever arch specific measurement units returned by node_distance())
+ * then switch on zone reclaim on boot.
+ */
+#define RECLAIM_DISTANCE 20
+#endif
 #ifndef PENALTY_FOR_NODE_WITH_CPUS
 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
 #endif