diff options
| author | Mel Gorman <mel@csn.ul.ie> | 2010-05-24 14:32:27 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-25 08:06:59 -0700 |
| commit | 748446bb6b5a9390b546af38ec899c868a9dbcf0 (patch) | |
| tree | 4c27d0805a5e094b39ff938ad60dd270b953a79f /include/linux/migrate.h | |
| parent | c175a0ce7584e5b498fff8cbdb9aa7912aa9fbba (diff) | |
mm: compaction: memory compaction core
This patch is the core of a mechanism which compacts memory in a zone by
relocating movable pages towards the end of the zone.
A single compaction run involves a migration scanner and a free scanner.
Both scanners operate on pageblock-sized areas in the zone. The migration
scanner starts at the bottom of the zone and searches for all movable
pages within each area, isolating them onto a private list called
migratelist. The free scanner starts at the top of the zone and searches
for suitable areas and consumes the free pages within making them
available for the migration scanner. The pages isolated for migration are
then migrated to the newly isolated free pages.
[aarcange@redhat.com: Fix unsafe optimisation]
[mel@csn.ul.ie: do not schedule work on other CPUs for compaction]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Rik van Riel <riel@redhat.com>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/migrate.h')
| -rw-r--r-- | include/linux/migrate.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/migrate.h b/include/linux/migrate.h index 7a07b17d27c..7238231b8dd 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -19,6 +19,7 @@ extern int fail_migrate_page(struct address_space *, struct page *, struct page *); extern int migrate_prep(void); +extern int migrate_prep_local(void); extern int migrate_vmas(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, unsigned long flags); @@ -30,6 +31,7 @@ static inline int migrate_pages(struct list_head *l, new_page_t x, unsigned long private, int offlining) { return -ENOSYS; } static inline int migrate_prep(void) { return -ENOSYS; } +static inline int migrate_prep_local(void) { return -ENOSYS; } static inline int migrate_vmas(struct mm_struct *mm, const nodemask_t *from, const nodemask_t *to, |