Split the free lists for movable and unmovable allocations
This patch adds the core of the fragmentation reduction strategy. It works by
grouping pages together based on their ability to migrate or be reclaimed.
Basically, it works by breaking the list in zone->free_area list into
MIGRATE_TYPES number of lists.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 322e804..5770003 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -33,8 +33,16 @@
*/
#define PAGE_ALLOC_COSTLY_ORDER 3
+#define MIGRATE_UNMOVABLE 0
+#define MIGRATE_MOVABLE 1
+#define MIGRATE_TYPES 2
+
+#define for_each_migratetype_order(order, type) \
+ for (order = 0; order < MAX_ORDER; order++) \
+ for (type = 0; type < MIGRATE_TYPES; type++)
+
struct free_area {
- struct list_head free_list;
+ struct list_head free_list[MIGRATE_TYPES];
unsigned long nr_free;
};