Index: linux-2.6.18-rc4/include/linux/mm.h
===================================================================
--- linux-2.6.18-rc4.orig/include/linux/mm.h	2006-08-06 11:20:11.000000000 -0700
+++ linux-2.6.18-rc4/include/linux/mm.h	2006-08-09 15:13:37.082773044 -0700
@@ -224,10 +224,13 @@ struct page {
 	unsigned long flags;		/* Atomic flags, some possibly
 					 * updated asynchronously */
 	atomic_t _count;		/* Usage count, see below. */
-	atomic_t _mapcount;		/* Count of ptes mapped in mms,
-					 * to show when page is mapped
-					 * & limit reverse map searches.
-					 */
+	union {
+		atomic_t _mapcount;		/* Count of ptes mapped in mms,
+						 * to show when page is mapped
+						 * & limit reverse map searches.
+						 */
+		int inuse;		/* Sslab: objects in use */
+	}
 	union {
 	    struct {
 		unsigned long private;		/* Mapping-private opaque data:
@@ -237,19 +240,25 @@ struct page {
 						 * indicates order in the buddy
 						 * system if PG_buddy is set.
 						 */
-		struct address_space *mapping;	/* If low bit clear, points to
+		union {
+		 struct address_space *mapping;	/* If low bit clear, points to
 						 * inode address_space, or NULL.
 						 * If page mapped as anonymous
 						 * memory, low bit is set, and
 						 * it points to anon_vma object:
 						 * see PAGE_MAPPING_ANON below.
 						 */
+		 struct sslab *slab;		/* Pointer to slab */
+		}
 	    };
 #if NR_CPUS >= CONFIG_SPLIT_PTLOCK_CPUS
 	    spinlock_t ptl;
 #endif
 	};
-	pgoff_t index;			/* Our offset within mapping. */
+	union {
+		pgoff_t index;			/* Our offset within mapping. */
+		void *object;	/* Pointer to the first free slab object */
+	}
 	struct list_head lru;		/* Pageout list, eg. active_list
 					 * protected by zone->lru_lock !
 					 */