swap: use an array for the LRU pagevecs

[mirror_ubuntu-bionic-kernel.git] / mm / migrate.c

diff --git a/mm/migrate.c b/mm/migrate.c
index 2a80136b23bbc16fb9d2ec2fad932b29e30dda50..ad15b5ef25997d8176fa48de056ced57c5a23b94 100644 (file)
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -36,36 +36,6 @@
 
 #define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
 
-/*
- * Isolate one page from the LRU lists. If successful put it onto
- * the indicated list with elevated page count.
- *
- * Result:
- *  -EBUSY: page not on LRU list
- *  0: page removed from LRU list and added to the specified list.
- */
-int isolate_lru_page(struct page *page, struct list_head *pagelist)
-{
-       int ret = -EBUSY;
-
-       if (PageLRU(page)) {
-               struct zone *zone = page_zone(page);
-
-               spin_lock_irq(&zone->lru_lock);
-               if (PageLRU(page) && get_page_unless_zero(page)) {
-                       ret = 0;
-                       ClearPageLRU(page);
-                       if (PageActive(page))
-                               del_page_from_active_list(zone, page);
-                       else
-                               del_page_from_inactive_list(zone, page);
-                       list_add_tail(&page->lru, pagelist);
-               }
-               spin_unlock_irq(&zone->lru_lock);
-       }
-       return ret;
-}
-
 /*
  * migrate_prep() needs to be called before we start compiling a list of pages
  * to be migrated using isolate_lru_page().
@@ -85,16 +55,7 @@ int migrate_prep(void)
 
 static inline void move_to_lru(struct page *page)
 {
-       if (PageActive(page)) {
-               /*
-                * lru_cache_add_active checks that
-                * the PG_active bit is off.
-                */
-               ClearPageActive(page);
-               lru_cache_add_active(page);
-       } else {
-               lru_cache_add(page);
-       }
+       lru_cache_add_lru(page, page_lru(page));
        put_page(page);
 }
 
@@ -914,7 +875,9 @@ static int do_move_pages(struct mm_struct *mm, struct page_to_node *pm,
                                !migrate_all)
                        goto put_and_set;
 
-               err = isolate_lru_page(page, &pagelist);
+               err = isolate_lru_page(page);
+               if (!err)
+                       list_add_tail(&page->lru, &pagelist);
 put_and_set:
                /*
                 * Either remove the duplicate refcount from