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-rw-r--r--mm/migrate.c31
1 files changed, 17 insertions, 14 deletions
diff --git a/mm/migrate.c b/mm/migrate.c
index c07327487111..b10237d8b459 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -53,14 +53,9 @@ int migrate_prep(void)
return 0;
}
-static inline void move_to_lru(struct page *page)
-{
- lru_cache_add_lru(page, page_lru(page));
- put_page(page);
-}
-
/*
- * Add isolated pages on the list back to the LRU.
+ * Add isolated pages on the list back to the LRU under page lock
+ * to avoid leaking evictable pages back onto unevictable list.
*
* returns the number of pages put back.
*/
@@ -72,7 +67,7 @@ int putback_lru_pages(struct list_head *l)
list_for_each_entry_safe(page, page2, l, lru) {
list_del(&page->lru);
- move_to_lru(page);
+ putback_lru_page(page);
count++;
}
return count;
@@ -354,8 +349,11 @@ static void migrate_page_copy(struct page *newpage, struct page *page)
SetPageReferenced(newpage);
if (PageUptodate(page))
SetPageUptodate(newpage);
- if (PageActive(page))
+ if (TestClearPageActive(page)) {
+ VM_BUG_ON(PageUnevictable(page));
SetPageActive(newpage);
+ } else
+ unevictable_migrate_page(newpage, page);
if (PageChecked(page))
SetPageChecked(newpage);
if (PageMappedToDisk(page))
@@ -376,7 +374,6 @@ static void migrate_page_copy(struct page *newpage, struct page *page)
#ifdef CONFIG_SWAP
ClearPageSwapCache(page);
#endif
- ClearPageActive(page);
ClearPagePrivate(page);
set_page_private(page, 0);
page->mapping = NULL;
@@ -555,6 +552,10 @@ static int fallback_migrate_page(struct address_space *mapping,
*
* The new page will have replaced the old page if this function
* is successful.
+ *
+ * Return value:
+ * < 0 - error code
+ * == 0 - success
*/
static int move_to_new_page(struct page *newpage, struct page *page)
{
@@ -617,9 +618,10 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
if (!newpage)
return -ENOMEM;
- if (page_count(page) == 1)
+ if (page_count(page) == 1) {
/* page was freed from under us. So we are done. */
goto move_newpage;
+ }
charge = mem_cgroup_prepare_migration(page, newpage);
if (charge == -ENOMEM) {
@@ -693,7 +695,6 @@ rcu_unlock:
rcu_read_unlock();
unlock:
-
unlock_page(page);
if (rc != -EAGAIN) {
@@ -704,17 +705,19 @@ unlock:
* restored.
*/
list_del(&page->lru);
- move_to_lru(page);
+ putback_lru_page(page);
}
move_newpage:
if (!charge)
mem_cgroup_end_migration(newpage);
+
/*
* Move the new page to the LRU. If migration was not successful
* then this will free the page.
*/
- move_to_lru(newpage);
+ putback_lru_page(newpage);
+
if (result) {
if (rc)
*result = rc;