diff options
author | Christoph Lameter <clameter@sgi.com> | 2006-02-01 06:05:41 -0500 |
---|---|---|
committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-01 11:53:17 -0500 |
commit | e965f9630c651fa4249039fd4b80c9392d07a856 (patch) | |
tree | 1353dd536d0ee549c30e462086624c21788ee9d2 /include/linux/swap.h | |
parent | 7e2ab150d1b3b286a4c864c60a549b2601777b63 (diff) |
[PATCH] Direct Migration V9: Avoid writeback / page_migrate() method
Migrate a page with buffers without requiring writeback
This introduces a new address space operation migratepage() that may be used
by a filesystem to implement its own version of page migration.
A version is provided that migrates buffers attached to pages. Some
filesystems (ext2, ext3, xfs) are modified to utilize this feature.
The swapper address space operation are modified so that a regular
migrate_page() will occur for anonymous pages without writeback (migrate_pages
forces every anonymous page to have a swap entry).
Signed-off-by: Mike Kravetz <kravetz@us.ibm.com>
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r-- | include/linux/swap.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h index 229b6d04b4b6..f3e17d5963c3 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h | |||
@@ -193,13 +193,18 @@ extern int isolate_lru_page(struct page *p); | |||
193 | extern int putback_lru_pages(struct list_head *l); | 193 | extern int putback_lru_pages(struct list_head *l); |
194 | extern int migrate_page(struct page *, struct page *); | 194 | extern int migrate_page(struct page *, struct page *); |
195 | extern void migrate_page_copy(struct page *, struct page *); | 195 | extern void migrate_page_copy(struct page *, struct page *); |
196 | extern int migrate_page_remove_references(struct page *, struct page *, int); | ||
196 | extern int migrate_pages(struct list_head *l, struct list_head *t, | 197 | extern int migrate_pages(struct list_head *l, struct list_head *t, |
197 | struct list_head *moved, struct list_head *failed); | 198 | struct list_head *moved, struct list_head *failed); |
199 | extern int fail_migrate_page(struct page *, struct page *); | ||
198 | #else | 200 | #else |
199 | static inline int isolate_lru_page(struct page *p) { return -ENOSYS; } | 201 | static inline int isolate_lru_page(struct page *p) { return -ENOSYS; } |
200 | static inline int putback_lru_pages(struct list_head *l) { return 0; } | 202 | static inline int putback_lru_pages(struct list_head *l) { return 0; } |
201 | static inline int migrate_pages(struct list_head *l, struct list_head *t, | 203 | static inline int migrate_pages(struct list_head *l, struct list_head *t, |
202 | struct list_head *moved, struct list_head *failed) { return -ENOSYS; } | 204 | struct list_head *moved, struct list_head *failed) { return -ENOSYS; } |
205 | /* Possible settings for the migrate_page() method in address_operations */ | ||
206 | #define migrate_page NULL | ||
207 | #define fail_migrate_page NULL | ||
203 | #endif | 208 | #endif |
204 | 209 | ||
205 | #ifdef CONFIG_MMU | 210 | #ifdef CONFIG_MMU |