[PATCH] kill last zone_reclaim() bits

Remove the last bits of Martin's ill-fated sys_set_zone_reclaim().

Cc: Martin Hicks <mort@wildopensource.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

include/asm-i386/unistd.h

@@ -256,7 +256,7 @@
 #define __NR_io_submit		248
 #define __NR_io_cancel		249
 #define __NR_fadvise64		250
-#define __NR_set_zone_reclaim	251
+/* 251 is available for reuse (was briefly sys_set_zone_reclaim) */
 #define __NR_exit_group		252
 #define __NR_lookup_dcookie	253
 #define __NR_epoll_create	254

include/asm-ia64/unistd.h

@@ -265,7 +265,7 @@
 #define __NR_keyctl			1273
 #define __NR_ioprio_set			1274
 #define __NR_ioprio_get			1275
-#define __NR_set_zone_reclaim		1276
+/* 1276 is available for reuse (was briefly sys_set_zone_reclaim) */
 #define __NR_inotify_init		1277
 #define __NR_inotify_add_watch		1278
 #define __NR_inotify_rm_watch		1279

include/linux/swap.h

@@ -172,7 +172,6 @@ extern void swap_setup(void);
 
 /* linux/mm/vmscan.c */
 extern int try_to_free_pages(struct zone **, gfp_t);
-extern int zone_reclaim(struct zone *, gfp_t, unsigned int);
 extern int shrink_all_memory(int);
 extern int vm_swappiness;
 

mm/vmscan.c

@@ -74,9 +74,6 @@ struct scan_control {
 
 	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
@@ -430,8 +427,6 @@ static int shrink_list(struct list_head *page_list, struct scan_control *sc)
 		 * Try to allocate it some swap space here.
 		 */
 		if (PageAnon(page) && !PageSwapCache(page)) {
-			if (!sc->may_swap)
-				goto keep_locked;
 			if (!add_to_swap(page))
 				goto activate_locked;
 		}
@@ -952,7 +947,6 @@ int try_to_free_pages(struct zone **zones, gfp_t gfp_mask)
 
 	sc.gfp_mask = gfp_mask;
 	sc.may_writepage = 0;
-	sc.may_swap = 1;
 
 	inc_page_state(allocstall);
 
@@ -1055,7 +1049,6 @@ static int balance_pgdat(pg_data_t *pgdat, int nr_pages, int order)
 	total_reclaimed = 0;
 	sc.gfp_mask = GFP_KERNEL;
 	sc.may_writepage = 0;
-	sc.may_swap = 1;
 	sc.nr_mapped = read_page_state(nr_mapped);
 
 	inc_page_state(pageoutrun);
@@ -1353,76 +1346,3 @@ static int __init kswapd_init(void)
 }
 
 module_init(kswapd_init)
-
-
-/*
- * Try to free up some pages from this zone through reclaim.
- */
-int zone_reclaim(struct zone *zone, gfp_t gfp_mask, unsigned int order)
-{
-	struct scan_control sc;
-	int nr_pages = 1 << order;
-	int total_reclaimed = 0;
-
-	/* The reclaim may sleep, so don't do it if sleep isn't allowed */
-	if (!(gfp_mask & __GFP_WAIT))
-		return 0;
-	if (zone->all_unreclaimable)
-		return 0;
-
-	sc.gfp_mask = gfp_mask;
-	sc.may_writepage = 0;
-	sc.may_swap = 0;
-	sc.nr_mapped = read_page_state(nr_mapped);
-	sc.nr_scanned = 0;
-	sc.nr_reclaimed = 0;
-	/* scan at the highest priority */
-	sc.priority = 0;
-	disable_swap_token();
-
-	if (nr_pages > SWAP_CLUSTER_MAX)
-		sc.swap_cluster_max = nr_pages;
-	else
-		sc.swap_cluster_max = SWAP_CLUSTER_MAX;
-
-	/* Don't reclaim the zone if there are other reclaimers active */
-	if (atomic_read(&zone->reclaim_in_progress) > 0)
-		goto out;
-
-	shrink_zone(zone, &sc);
-	total_reclaimed = sc.nr_reclaimed;
-
- out:
-	return total_reclaimed;
-}
-
-asmlinkage long sys_set_zone_reclaim(unsigned int node, unsigned int zone,
-				     unsigned int state)
-{
-	struct zone *z;
-	int i;
-
-	if (!capable(CAP_SYS_ADMIN))
-		return -EACCES;
-
-	if (node >= MAX_NUMNODES || !node_online(node))
-		return -EINVAL;
-
-	/* This will break if we ever add more zones */
-	if (!(zone & (1<<ZONE_DMA|1<<ZONE_NORMAL|1<<ZONE_HIGHMEM)))
-		return -EINVAL;
-
-	for (i = 0; i < MAX_NR_ZONES; i++) {
-		if (!(zone & 1<<i))
-			continue;
-
-		z = &NODE_DATA(node)->node_zones[i];
-
-		if (state)
-			z->reclaim_pages = 1;
-		else
-			z->reclaim_pages = 0;
-	}
-
-	return 0;
-}