[PATCH] memory cgroup enhancements take 4 [8/8] implicit force empty at rmdir()

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

This patch adds pre_destroy handler for mem_cgroup and try to make
mem_cgroup empty at rmdir().

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

 mm/memcontrol.c |    8 ++++++++
 1 file changed, 8 insertions(+)

Index: devel-2.6.23-mm1/mm/memcontrol.c
===================================================================
--- devel-2.6.23-mm1.orig/mm/memcontrol.c
+++ devel-2.6.23-mm1/mm/memcontrol.c
@@ -923,6 +923,13 @@ mem_cgroup_create(struct cgroup_subsys *
 	return &mem->css;
 }
 
+static void mem_cgroup_pre_destroy(struct cgroup_subsys *ss,
+					struct cgroup *cont)
+{
+	struct mem_cgroup *mem = mem_cgroup_from_cont(cont);
+	mem_cgroup_force_empty(mem);
+}
+
 static void mem_cgroup_destroy(struct cgroup_subsys *ss,
 				struct cgroup *cont)
 {
@@ -974,6 +981,7 @@ struct cgroup_subsys mem_cgroup_subsys =
 	.name = "memory",
 	.subsys_id = mem_cgroup_subsys_id,
 	.create = mem_cgroup_create,
+	.pre_destroy = mem_cgroup_pre_destroy,
 	.destroy = mem_cgroup_destroy,
 	.populate = mem_cgroup_populate,
 	.attach = mem_cgroup_move_task,

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