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authorChristoph Lameter <clameter@sgi.com>2006-02-01 06:05:41 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-01 11:53:17 -0500
commite965f9630c651fa4249039fd4b80c9392d07a856 (patch)
tree1353dd536d0ee549c30e462086624c21788ee9d2 /include/linux/swap.h
parent7e2ab150d1b3b286a4c864c60a549b2601777b63 (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.h5
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);
193extern int putback_lru_pages(struct list_head *l); 193extern int putback_lru_pages(struct list_head *l);
194extern int migrate_page(struct page *, struct page *); 194extern int migrate_page(struct page *, struct page *);
195extern void migrate_page_copy(struct page *, struct page *); 195extern void migrate_page_copy(struct page *, struct page *);
196extern int migrate_page_remove_references(struct page *, struct page *, int);
196extern int migrate_pages(struct list_head *l, struct list_head *t, 197extern 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);
199extern int fail_migrate_page(struct page *, struct page *);
198#else 200#else
199static inline int isolate_lru_page(struct page *p) { return -ENOSYS; } 201static inline int isolate_lru_page(struct page *p) { return -ENOSYS; }
200static inline int putback_lru_pages(struct list_head *l) { return 0; } 202static inline int putback_lru_pages(struct list_head *l) { return 0; }
201static inline int migrate_pages(struct list_head *l, struct list_head *t, 203static 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