This patch exports shrink_list() function. Memory migration code calls the
function to free inactive pages.

Signed-off-by: Hirokazu Takahashi <taka@valinux.co.jp>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Index: linux-2.6.13/include/linux/swap.h
===================================================================
--- linux-2.6.13.orig/include/linux/swap.h	2005-08-30 12:16:50.000000000 -0700
+++ linux-2.6.13/include/linux/swap.h	2005-08-30 12:17:15.000000000 -0700
@@ -187,6 +187,39 @@ typedef enum {
 	PAGE_CLEAN,
 } pageout_t;
 extern pageout_t pageout(struct page *, struct address_space *);
+struct scan_control {
+	/* Ask refill_inactive_zone, or shrink_cache to scan this many pages */
+	unsigned long nr_to_scan;
+
+	/* Incremented by the number of inactive pages that were scanned */
+	unsigned long nr_scanned;
+
+	/* Incremented by the number of pages reclaimed */
+	unsigned long nr_reclaimed;
+
+	unsigned long nr_mapped;	/* From page_state */
+
+	/* How many pages shrink_cache() should reclaim */
+	int nr_to_reclaim;
+
+	/* Ask shrink_caches, or shrink_zone to scan at this priority */
+	unsigned int priority;
+
+	/* This context's GFP mask */
+	unsigned int gfp_mask;
+
+	int may_writepage;
+
+	/* This context's SWAP_CLUSTER_MAX. If freeing memory for
+	 * suspend, we effectively ignore SWAP_CLUSTER_MAX.
+	 * In this context, it doesn't matter that we scan the
+	 * whole list at once. */
+	int swap_cluster_max;
+
+	/* Can pages be swapped as part of reclaim? */
+	int may_swap;
+};
+extern int shrink_list(struct list_head *, struct scan_control *);
 extern int vm_swappiness;
 
 #ifdef CONFIG_MMU
Index: linux-2.6.13/mm/vmscan.c
===================================================================
--- linux-2.6.13.orig/mm/vmscan.c	2005-08-30 12:16:48.000000000 -0700
+++ linux-2.6.13/mm/vmscan.c	2005-08-30 12:17:15.000000000 -0700
@@ -39,39 +39,6 @@
 
 #include <linux/swapops.h>
 
-struct scan_control {
-	/* Ask refill_inactive_zone, or shrink_cache to scan this many pages */
-	unsigned long nr_to_scan;
-
-	/* Incremented by the number of inactive pages that were scanned */
-	unsigned long nr_scanned;
-
-	/* Incremented by the number of pages reclaimed */
-	unsigned long nr_reclaimed;
-
-	unsigned long nr_mapped;	/* From page_state */
-
-	/* How many pages shrink_cache() should reclaim */
-	int nr_to_reclaim;
-
-	/* Ask shrink_caches, or shrink_zone to scan at this priority */
-	unsigned int priority;
-
-	/* This context's GFP mask */
-	unsigned int gfp_mask;
-
-	int may_writepage;
-
-	/* Can pages be swapped as part of reclaim? */
-	int may_swap;
-
-	/* This context's SWAP_CLUSTER_MAX. If freeing memory for
-	 * suspend, we effectively ignore SWAP_CLUSTER_MAX.
-	 * In this context, it doesn't matter that we scan the
-	 * whole list at once. */
-	int swap_cluster_max;
-};
-
 /*
  * The list of shrinker callbacks used by to apply pressure to
  * ageable caches.
@@ -361,7 +328,7 @@ pageout_t pageout(struct page *page, str
 /*
  * shrink_list adds the number of reclaimed pages to sc->nr_reclaimed
  */
-static int shrink_list(struct list_head *page_list, struct scan_control *sc)
+int shrink_list(struct list_head *page_list, struct scan_control *sc)
 {
 	LIST_HEAD(ret_pages);
 	struct pagevec freed_pvec;