[PATCH][for -mm] per-zone and reclaim enhancements for memorycontroller take 3 [2/10] nid/zid helper function for cgroup

[KAMEZAWA Hiroyuki]

Add macro to get node_id and zone_id of page_cgroup.
Will be used in per-zone-xxx patches and others.

Changelog:
 - returns zone_type instead of int.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>


 mm/memcontrol.c |   10 ++++++++++
 1 file changed, 10 insertions(+)

Index: linux-2.6.24-rc3-mm1/mm/memcontrol.c
===================================================================
--- linux-2.6.24-rc3-mm1.orig/mm/memcontrol.c	2007-11-26 15:31:19.000000000 +0900
+++ linux-2.6.24-rc3-mm1/mm/memcontrol.c	2007-11-26 16:39:00.000000000 +0900
@@ -135,6 +135,16 @@
 #define PAGE_CGROUP_FLAG_CACHE	(0x1)	/* charged as cache */
 #define PAGE_CGROUP_FLAG_ACTIVE (0x2)	/* page is active in this cgroup */
 
+static inline int page_cgroup_nid(struct page_cgroup *pc)
+{
+	return page_to_nid(pc->page);
+}
+
+static inline enum zone_type page_cgroup_zid(struct page_cgroup *pc)
+{
+	return page_zonenum(pc->page);
+}
+
 enum {
 	MEM_CGROUP_TYPE_UNSPEC = 0,
 	MEM_CGROUP_TYPE_MAPPED,

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