Group short-lived and reclaimable kernel allocations
This patch marks a number of allocations that are either short-lived such as
network buffers or are reclaimable such as inode allocations. When something
like updatedb is called, long-lived and unmovable kernel allocations tend to
be spread throughout the address space which increases fragmentation.
This patch groups these allocations together as much as possible by adding a
new MIGRATE_TYPE. The MIGRATE_RECLAIMABLE type is for allocations that can be
reclaimed on demand, but not moved. i.e. they can be migrated by deleting
them and re-reading the information from elsewhere.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Christoph Lameter <clameter@sgi.com>
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 7d7e4fe..4721e9a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -35,10 +35,12 @@
#ifdef CONFIG_PAGE_GROUP_BY_MOBILITY
#define MIGRATE_UNMOVABLE 0
-#define MIGRATE_MOVABLE 1
-#define MIGRATE_TYPES 2
+#define MIGRATE_RECLAIMABLE 1
+#define MIGRATE_MOVABLE 2
+#define MIGRATE_TYPES 3
#else
#define MIGRATE_UNMOVABLE 0
+#define MIGRATE_UNRECLAIMABLE 0
#define MIGRATE_MOVABLE 0
#define MIGRATE_TYPES 1
#endif