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| author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-16 12:26:11 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 20:43:02 +0400 |
| commit | a5d76b54a3f3a40385d7f76069a2feac9f1bad63 (patch) | |
| tree | f58c432a4224b3be032bd4a4afa79dfa55d198a6 /include/linux/mmzone.h | |
| parent | 75884fb1c6388f3713ddcca662f3647b3129aaeb (diff) | |
| download | linux-a5d76b54a3f3a40385d7f76069a2feac9f1bad63.tar.xz | |
memory unplug: page isolation
Implement generic chunk-of-pages isolation method by using page grouping ops.
This patch add MIGRATE_ISOLATE to MIGRATE_TYPES. By this
- MIGRATE_TYPES increases.
- bitmap for migratetype is enlarged.
pages of MIGRATE_ISOLATE migratetype will not be allocated even if it is free.
By this, you can isolated *freed* pages from users. How-to-free pages is not
a purpose of this patch. You may use reclaim and migrate codes to free pages.
If start_isolate_page_range(start,end) is called,
- migratetype of the range turns to be MIGRATE_ISOLATE if
its type is MIGRATE_MOVABLE. (*) this check can be updated if other
memory reclaiming works make progress.
- MIGRATE_ISOLATE is not on migratetype fallback list.
- All free pages and will-be-freed pages are isolated.
To check all pages in the range are isolated or not, use test_pages_isolated(),
To cancel isolation, use undo_isolate_page_range().
Changes V6 -> V7
- removed unnecessary #ifdef
There are HOLES_IN_ZONE handling codes...I'm glad if we can remove them..
Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com>
Signed-off-by: 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/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 20ea42c45e4a..f4bfe824834f 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -37,7 +37,8 @@ #define MIGRATE_RECLAIMABLE 1 #define MIGRATE_MOVABLE 2 #define MIGRATE_RESERVE 3 -#define MIGRATE_TYPES 4 +#define MIGRATE_ISOLATE 4 /* can't allocate from here */ +#define MIGRATE_TYPES 5 #define for_each_migratetype_order(order, type) \ for (order = 0; order < MAX_ORDER; order++) \ |