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authorChristoph Lameter <clameter@sgi.com>2006-01-18 17:42:31 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-18 19:20:17 -0800
commit9eeff2395e3cfd05c9b2e6074ff943a34b0c5c21 (patch)
tree20160098ec6ed8738cfecfc5f81181ad22b44e60 /include
parentf1fd1067ece574ab56e4a70878b9a5a1ed4c3c42 (diff)
[PATCH] Zone reclaim: Reclaim logic
Some bits for zone reclaim exists in 2.6.15 but they are not usable. This patch fixes them up, removes unused code and makes zone reclaim usable. Zone reclaim allows the reclaiming of pages from a zone if the number of free pages falls below the watermarks even if other zones still have enough pages available. Zone reclaim is of particular importance for NUMA machines. It can be more beneficial to reclaim a page than taking the performance penalties that come with allocating a page on a remote zone. Zone reclaim is enabled if the maximum distance to another node is higher than RECLAIM_DISTANCE, which may be defined by an arch. By default RECLAIM_DISTANCE is 20. 20 is the distance to another node in the same component (enclosure or motherboard) on IA64. The meaning of the NUMA distance information seems to vary by arch. If zone reclaim is not successful then no further reclaim attempts will occur for a certain time period (ZONE_RECLAIM_INTERVAL). This patch was discussed before. See http://marc.theaimsgroup.com/?l=linux-kernel&m=113519961504207&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113408418232531&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113389027420032&w=2 http://marc.theaimsgroup.com/?l=linux-kernel&m=113380938612205&w=2 Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h12
-rw-r--r--include/linux/swap.h11
-rw-r--r--include/linux/topology.h8
3 files changed, 26 insertions, 5 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 34cbefd2ebd..93a849f742d 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 d01f7efb0f2..4a99e4a7fbf 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 315a5163d6a..e8eb0040ce3 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