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authorMel Gorman <mel@csn.ul.ie>2007-10-16 04:25:52 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 12:43:00 -0400
commite12ba74d8ff3e2f73a583500d7095e406df4d093 (patch)
treea0d3385b65f0b3e1e00b0bbf11b75e7538a93edb /include/linux/mmzone.h
parentc361be55b3128474aa66d31092db330b07539103 (diff)
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>
Diffstat (limited to 'include/linux/mmzone.h')
-rw-r--r--include/linux/mmzone.h6
1 files changed, 4 insertions, 2 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 7d7e4fe0fda8..4721e9aa3ced 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -35,10 +35,12 @@
35 35
36#ifdef CONFIG_PAGE_GROUP_BY_MOBILITY 36#ifdef CONFIG_PAGE_GROUP_BY_MOBILITY
37#define MIGRATE_UNMOVABLE 0 37#define MIGRATE_UNMOVABLE 0
38#define MIGRATE_MOVABLE 1 38#define MIGRATE_RECLAIMABLE 1
39#define MIGRATE_TYPES 2 39#define MIGRATE_MOVABLE 2
40#define MIGRATE_TYPES 3
40#else 41#else
41#define MIGRATE_UNMOVABLE 0 42#define MIGRATE_UNMOVABLE 0
43#define MIGRATE_UNRECLAIMABLE 0
42#define MIGRATE_MOVABLE 0 44#define MIGRATE_MOVABLE 0
43#define MIGRATE_TYPES 1 45#define MIGRATE_TYPES 1
44#endif 46#endif