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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:25:50 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:42:59 -0700
commitb92a6edd4b77a8794adb497280beea5df5e59a14 (patch)
tree396ea5cf2b53fc066e949c443f03747ec868de1e /include
parent535131e6925b4a95f321148ad7293f496e0e58d7 (diff)
Add a configure option to group pages by mobility
The grouping mechanism has some memory overhead and a more complex allocation path. This patch allows the strategy to be disabled for small memory systems or if it is known the workload is suffering because of the strategy. It also acts to show where the page groupings strategy interacts with the standard buddy allocator. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Joel Schopp <jschopp@austin.ibm.com> Cc: Andy Whitcroft <apw@shadowen.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 57700038e66..7d7e4fe0fda 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -33,9 +33,15 @@
*/
#define PAGE_ALLOC_COSTLY_ORDER 3
+#ifdef CONFIG_PAGE_GROUP_BY_MOBILITY
#define MIGRATE_UNMOVABLE 0
#define MIGRATE_MOVABLE 1
#define MIGRATE_TYPES 2
+#else
+#define MIGRATE_UNMOVABLE 0
+#define MIGRATE_MOVABLE 0
+#define MIGRATE_TYPES 1
+#endif
#define for_each_migratetype_order(order, type) \
for (order = 0; order < MAX_ORDER; order++) \