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author | KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> | 2007-10-16 10:26:11 +0200 |
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committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-10-16 18:43:02 +0200 |
commit | a5d76b54a3f3a40385d7f76069a2feac9f1bad63 (patch) | |
tree | f58c432a4224b3be032bd4a4afa79dfa55d198a6 /mm/page_alloc.c | |
parent | memory unplug: memory hotplug cleanup (diff) | |
download | linux-a5d76b54a3f3a40385d7f76069a2feac9f1bad63.tar.xz 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 'mm/page_alloc.c')
-rw-r--r-- | mm/page_alloc.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 71ced519c31c..a44715e82058 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -41,6 +41,7 @@ #include <linux/pfn.h> #include <linux/backing-dev.h> #include <linux/fault-inject.h> +#include <linux/page-isolation.h> #include <asm/tlbflush.h> #include <asm/div64.h> @@ -4433,3 +4434,46 @@ void set_pageblock_flags_group(struct page *page, unsigned long flags, else __clear_bit(bitidx + start_bitidx, bitmap); } + +/* + * This is designed as sub function...plz see page_isolation.c also. + * set/clear page block's type to be ISOLATE. + * page allocater never alloc memory from ISOLATE block. + */ + +int set_migratetype_isolate(struct page *page) +{ + struct zone *zone; + unsigned long flags; + int ret = -EBUSY; + + zone = page_zone(page); + spin_lock_irqsave(&zone->lock, flags); + /* + * In future, more migrate types will be able to be isolation target. + */ + if (get_pageblock_migratetype(page) != MIGRATE_MOVABLE) + goto out; + set_pageblock_migratetype(page, MIGRATE_ISOLATE); + move_freepages_block(zone, page, MIGRATE_ISOLATE); + ret = 0; +out: + spin_unlock_irqrestore(&zone->lock, flags); + if (!ret) + drain_all_local_pages(); + return ret; +} + +void unset_migratetype_isolate(struct page *page) +{ + struct zone *zone; + unsigned long flags; + zone = page_zone(page); + spin_lock_irqsave(&zone->lock, flags); + if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE) + goto out; + set_pageblock_migratetype(page, MIGRATE_MOVABLE); + move_freepages_block(zone, page, MIGRATE_MOVABLE); +out: + spin_unlock_irqrestore(&zone->lock, flags); +} |