[PATCH 5/21] memcg-hierarchy-avoid-unnecessary-reclaim.patch

[KAMEZAWA Hiroyuki]

From: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>

If hierarchy is not used, no tree-walk is necessary.

Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
Signed-off-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>
Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

 mm/memcontrol.c |    2 ++
 1 file changed, 2 insertions(+)

Index: mmotm-2.6.28-Dec02/mm/memcontrol.c
===================================================================
--- mmotm-2.6.28-Dec02.orig/mm/memcontrol.c
+++ mmotm-2.6.28-Dec02/mm/memcontrol.c
@@ -606,6 +606,8 @@ static int mem_cgroup_hierarchical_recla
 	ret = try_to_free_mem_cgroup_pages(root_mem, gfp_mask, noswap);
 	if (mem_cgroup_check_under_limit(root_mem))
 		return 0;
+	if (!root_mem->use_hierarchy)
+		return ret;
 
 	next_mem = mem_cgroup_get_first_node(root_mem);
 

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