[PATCH] page migration: use allocator function for migrate_pages()
Instead of passing a list of new pages, pass a function to allocate a new
page. This allows the correct placement of MPOL_INTERLEAVE pages during page
migration. It also further simplifies the callers of migrate pages.
migrate_pages() becomes similar to migrate_pages_to() so drop
migrate_pages_to(). The batching of new page allocations becomes unnecessary.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Jes Sorensen <jes@trained-monkey.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: Andi Kleen <ak@muc.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/migrate.h b/include/linux/migrate.h
index 83af259..5b95d65 100644
--- a/include/linux/migrate.h
+++ b/include/linux/migrate.h
@@ -3,14 +3,15 @@
#include <linux/mm.h>
+typedef struct page *new_page_t(struct page *, unsigned long private);
+
#ifdef CONFIG_MIGRATION
extern int isolate_lru_page(struct page *p, struct list_head *pagelist);
extern int putback_lru_pages(struct list_head *l);
extern int migrate_page(struct address_space *,
struct page *, struct page *);
-extern int migrate_pages(struct list_head *l, struct list_head *t);
-extern int migrate_pages_to(struct list_head *pagelist,
- struct vm_area_struct *vma, int dest);
+extern int migrate_pages(struct list_head *l, new_page_t x, unsigned long);
+
extern int fail_migrate_page(struct address_space *,
struct page *, struct page *);
@@ -21,8 +22,8 @@
static inline int isolate_lru_page(struct page *p, struct list_head *list)
{ return -ENOSYS; }
static inline int putback_lru_pages(struct list_head *l) { return 0; }
-static inline int migrate_pages(struct list_head *l, struct list_head *t)
- { return -ENOSYS; }
+static inline int migrate_pages(struct list_head *l, new_page_t x,
+ unsigned long private) { return -ENOSYS; }
static inline int migrate_pages_to(struct list_head *pagelist,
struct vm_area_struct *vma, int dest) { return 0; }