Unevictable LRU Infrastructure

[net-next-2.6.git] / mm / internal.h

diff --git a/mm/internal.h b/mm/internal.h
index 4e8e78b978b5b89031ee4ceb2a6c9fb324824bd7..3db17b2a1ac6a347256e998bbb9b4a76d03bf185 100644 (file)
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -39,8 +39,15 @@ static inline void __put_page(struct page *page)
        atomic_dec(&page->_count);
 }
 
+/*
+ * in mm/vmscan.c:
+ */
 extern int isolate_lru_page(struct page *page);
+extern void putback_lru_page(struct page *page);
 
+/*
+ * in mm/page_alloc.c
+ */
 extern void __free_pages_bootmem(struct page *page, unsigned int order);
 
 /*
@@ -54,6 +61,25 @@ static inline unsigned long page_order(struct page *page)
        return page_private(page);
 }
 
+#ifdef CONFIG_UNEVICTABLE_LRU
+/*
+ * unevictable_migrate_page() called only from migrate_page_copy() to
+ * migrate unevictable flag to new page.
+ * Note that the old page has been isolated from the LRU lists at this
+ * point so we don't need to worry about LRU statistics.
+ */
+static inline void unevictable_migrate_page(struct page *new, struct page *old)
+{
+       if (TestClearPageUnevictable(old))
+               SetPageUnevictable(new);
+}
+#else
+static inline void unevictable_migrate_page(struct page *new, struct page *old)
+{
+}
+#endif
+
+
 /*
  * FLATMEM and DISCONTIGMEM configurations use alloc_bootmem_node,
  * so all functions starting at paging_init should be marked __init