mm: add zone nr_pages helper function

Add zone_nr_pages() helper function.

It is used by a later patch.  This patch doesn't have any functional
change.

Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 11 insertions, 4 deletions

diff --git a/mm/vmscan.c b/mm/vmscan.c
index 03ca923c6656..6827d35954fb 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -136,6 +136,13 @@ static struct zone_reclaim_stat *get_reclaim_stat(struct zone *zone,
         return &zone->reclaim_stat;
 }
 
+static unsigned long zone_nr_pages(struct zone *zone, struct scan_control *sc,
+                                   enum lru_list lru)
+{
+        return zone_page_state(zone, NR_LRU_BASE + lru);
+}
+
+
 /*
  * Add a shrinker callback to be called from the vm
  */
@@ -1365,10 +1372,10 @@ static void get_scan_ratio(struct zone *zone, struct scan_control *sc,
                 return;
         }
 
-        anon  = zone_page_state(zone, NR_ACTIVE_ANON) +
-                zone_page_state(zone, NR_INACTIVE_ANON);
-        file  = zone_page_state(zone, NR_ACTIVE_FILE) +
-                zone_page_state(zone, NR_INACTIVE_FILE);
+        anon  = zone_nr_pages(zone, sc, LRU_ACTIVE_ANON) +
+                zone_nr_pages(zone, sc, LRU_INACTIVE_ANON);
+        file  = zone_nr_pages(zone, sc, LRU_ACTIVE_FILE) +
+                zone_nr_pages(zone, sc, LRU_INACTIVE_FILE);
         free  = zone_page_state(zone, NR_FREE_PAGES);
 
         /* If we have very few page cache pages, force-scan anon pages. */