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authorChristoph Lameter <clameter@sgi.com>2006-06-23 02:03:38 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-23 07:42:51 -0700
commit04e62a29bf157ce1edd168f2b71b533c80d13628 (patch)
tree7f0d5a58eeef2c2e08da86dc7141a1ccd050a37d /include
parent442c9137de8d769053e81d325709dca72f0b5e44 (diff)
[PATCH] More page migration: use migration entries for file pages
This implements the use of migration entries to preserve ptes of file backed pages during migration. Processes can therefore be migrated back and forth without loosing their connection to pagecache pages. Note that we implement the migration entries only for linear mappings. Nonlinear mappings still require the unmapping of the ptes for migration. And another writepage() ugliness shows up. writepage() can drop the page lock. Therefore we have to remove migration ptes before calling writepages() in order to avoid having migration entries point to unlocked pages. 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')
-rw-r--r--include/linux/swap.h15
1 files changed, 0 insertions, 15 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 7cee73ef4f1..1cf234e8df5 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -186,20 +186,6 @@ extern unsigned long shrink_all_memory(unsigned long nr_pages);
extern int vm_swappiness;
extern int remove_mapping(struct address_space *mapping, struct page *page);
-/* possible outcome of pageout() */
-typedef enum {
- /* failed to write page out, page is locked */
- PAGE_KEEP,
- /* move page to the active list, page is locked */
- PAGE_ACTIVATE,
- /* page has been sent to the disk successfully, page is unlocked */
- PAGE_SUCCESS,
- /* page is clean and locked */
- PAGE_CLEAN,
-} pageout_t;
-
-extern pageout_t pageout(struct page *page, struct address_space *mapping);
-
#ifdef CONFIG_NUMA
extern int zone_reclaim_mode;
extern int zone_reclaim_interval;
@@ -259,7 +245,6 @@ extern int remove_exclusive_swap_page(struct page *);
struct backing_dev_info;
extern spinlock_t swap_lock;
-extern int remove_vma_swap(struct vm_area_struct *vma, struct page *page);
/* linux/mm/thrash.c */
extern struct mm_struct * swap_token_mm;