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author | KAMEZAWA Hiroyuki | 2007-10-16 10:26:11 +0200 |
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committer | Linus Torvalds | 2007-10-16 18:43:02 +0200 |
commit | a5d76b54a3f3a40385d7f76069a2feac9f1bad63 (patch) | |
tree | f58c432a4224b3be032bd4a4afa79dfa55d198a6 /include/linux | |
parent | memory unplug: memory hotplug cleanup (diff) | |
download | kernel-qcow2-linux-a5d76b54a3f3a40385d7f76069a2feac9f1bad63.tar.gz kernel-qcow2-linux-a5d76b54a3f3a40385d7f76069a2feac9f1bad63.tar.xz kernel-qcow2-linux-a5d76b54a3f3a40385d7f76069a2feac9f1bad63.zip |
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')
-rw-r--r-- | include/linux/mmzone.h | 3 | ||||
-rw-r--r-- | include/linux/page-isolation.h | 37 | ||||
-rw-r--r-- | include/linux/pageblock-flags.h | 2 |
3 files changed, 40 insertions, 2 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++) \ diff --git a/include/linux/page-isolation.h b/include/linux/page-isolation.h new file mode 100644 index 000000000000..051c1b1ede4e --- /dev/null +++ b/include/linux/page-isolation.h @@ -0,0 +1,37 @@ +#ifndef __LINUX_PAGEISOLATION_H +#define __LINUX_PAGEISOLATION_H + +/* + * Changes migrate type in [start_pfn, end_pfn) to be MIGRATE_ISOLATE. + * If specified range includes migrate types other than MOVABLE, + * this will fail with -EBUSY. + * + * For isolating all pages in the range finally, the caller have to + * free all pages in the range. test_page_isolated() can be used for + * test it. + */ +extern int +start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn); + +/* + * Changes MIGRATE_ISOLATE to MIGRATE_MOVABLE. + * target range is [start_pfn, end_pfn) + */ +extern int +undo_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn); + +/* + * test all pages in [start_pfn, end_pfn)are isolated or not. + */ +extern int +test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn); + +/* + * Internal funcs.Changes pageblock's migrate type. + * Please use make_pagetype_isolated()/make_pagetype_movable(). + */ +extern int set_migratetype_isolate(struct page *page); +extern void unset_migratetype_isolate(struct page *page); + + +#endif diff --git a/include/linux/pageblock-flags.h b/include/linux/pageblock-flags.h index 9ea130829fb4..e875905f7b12 100644 --- a/include/linux/pageblock-flags.h +++ b/include/linux/pageblock-flags.h @@ -31,7 +31,7 @@ /* Bit indices that affect a whole block of pages */ enum pageblock_bits { - PB_range(PB_migrate, 2), /* 2 bits required for migrate types */ + PB_range(PB_migrate, 3), /* 3 bits required for migrate types */ NR_PAGEBLOCK_BITS }; |