[RFC][ for -mm] memory controller enhancements for NUMA [1/10] record nid/zid on page_cgroup

[KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>]

This patch adds nid/zoneid value to page cgroup.
This helps per-zone accounting for memory cgroup and reclaim routine.

Signed-off-by: KAMEZAWA Hiroyuki <kmaezawa.hiroyu@jp.fujitsu.com>

 mm/memcontrol.c |    6 ++++++
 1 file changed, 6 insertions(+)

Index: linux-2.6.24-rc2-mm1/mm/memcontrol.c
===================================================================
--- linux-2.6.24-rc2-mm1.orig/mm/memcontrol.c
+++ linux-2.6.24-rc2-mm1/mm/memcontrol.c
@@ -131,6 +131,8 @@ struct page_cgroup {
 	atomic_t ref_cnt;		/* Helpful when pages move b/w  */
 					/* mapped and cached states     */
 	int	 flags;
+	short	nid;
+	short	zid;
 };
 #define PAGE_CGROUP_FLAG_CACHE	(0x1)	/* charged as cache */
 #define PAGE_CGROUP_FLAG_ACTIVE (0x2)	/* page is active in this cgroup */
@@ -216,6 +218,10 @@ void page_assign_page_cgroup(struct page
 		VM_BUG_ON(!page_cgroup_locked(page));
 	locked = (page->page_cgroup & PAGE_CGROUP_LOCK);
 	page->page_cgroup = ((unsigned long)pc | locked);
+	if (pc) {
+		pc->nid = page_to_nid(page);
+		pc->zid = page_zonenum(page);
+	}
 }
 
 struct page_cgroup *page_get_page_cgroup(struct page *page)

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