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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:25:48 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:59 -0700
commitb2a0ac8875a0a3b9f0739b60526f8c5977d2200f (patch)
tree31826716b3209751a5468b840ff14190b4a5a8a2 /include/linux/mmzone.h
parent835c134ec4dd755e5c4470af566db226d1e96742 (diff)
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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>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h10
1 files changed, 9 insertions, 1 deletions
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;
};