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>
This commit is contained in:
Mel Gorman
2007-10-16 01:25:50 -07:00
committad av Linus Torvalds
förälder 535131e692
incheckning b92a6edd4b
3 ändrade filer med 58 tillägg och 16 borttagningar

Visa fil

@@ -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++) \