[Devel] [PATCH] memory cgroup enhancements take 4 [1/8] fix zone handling in try_to_free_mem_cgroup_page

[KAMEZAWA Hiroyuki]

Because NODE_DATA(node)->node_zonelists[] is guaranteed to contain
all necessary zones, it is not necessary to use for_each_online_node.

And this for_each_online_node() makes reclaim routine start always
from node 0. This is not good. This patch makes reclaim start from
caller's node and just use usual (default) zonelist order.

Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>

 mm/vmscan.c |   10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

Index: devel-2.6.23-mm1/mm/vmscan.c
===================================================================
--- devel-2.6.23-mm1.orig/mm/vmscan.c
+++ devel-2.6.23-mm1/mm/vmscan.c
@@ -1375,15 +1375,13 @@ unsigned long try_to_free_mem_cgroup_pag
 		.mem_cgroup = mem_cont,
 		.isolate_pages = mem_cgroup_isolate_pages,
 	};
-	int node;
+	int node = numa_node_id();
 	struct zone **zones;
 	int target_zone = gfp_zone(GFP_HIGHUSER_MOVABLE);
 
-	for_each_online_node(node) {
-		zones = NODE_DATA(node)->node_zonelists[target_zone].zones;
-		if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
-			return 1;
-	}
+	zones = NODE_DATA(node)->node_zonelists[target_zone].zones;
+	if (do_try_to_free_pages(zones, sc.gfp_mask, &sc))
+		return 1;
 	return 0;
 }
 #endif

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