diff -urN 2.3.18/include/linux/swap.h 2.3.18-lru/include/linux/swap.h
--- 2.3.18/include/linux/swap.h	Tue Oct  5 20:44:21 1999
+++ 2.3.18-lru/include/linux/swap.h	Tue Oct  5 21:10:59 1999
@@ -175,6 +175,14 @@
 	spin_unlock(&pagemap_lru_lock);		\
 } while (0)
 
+#define	lru_swap_cache_add(page)			\
+do {							\
+	spin_lock(&pagemap_lru_lock);			\
+	list_add_tail(&(page)->lru, &lru_cache);	\
+	nr_lru_pages++;					\
+	spin_unlock(&pagemap_lru_lock);			\
+} while (0)
+
 #define	lru_cache_del(page)			\
 do {						\
 	spin_lock(&pagemap_lru_lock);		\
diff -urN 2.3.18/mm/filemap.c 2.3.18-lru/mm/filemap.c
--- 2.3.18/mm/filemap.c	Tue Sep 14 14:35:32 1999
+++ 2.3.18-lru/mm/filemap.c	Tue Oct  5 21:44:07 1999
@@ -488,15 +488,19 @@
 	struct page **hash)
 {
 	unsigned long flags;
+	int page_cache = !PageSwapCache(page);
 
-	flags = page->flags & ~((1 << PG_uptodate) | (1 << PG_error) | (1 << PG_referenced));
+	flags = page->flags & ~((1 << PG_uptodate) | (1 << PG_error) | (page_cache << PG_referenced));
 	page->flags = flags | (1 << PG_locked);
 	page->owner = current;	/* REMOVEME */
 	get_page(page);
 	page->offset = offset;
 	add_page_to_inode_queue(inode, page);
 	__add_page_to_hash_queue(page, hash);
-	lru_cache_add(page);
+	if (page_cache)
+		lru_cache_add(page);
+	else
+		lru_swap_cache_add(page);
 }
 
 void add_to_page_cache(struct page * page, struct inode * inode, unsigned long offset)