Memory controller: task migration

					ARRAY_SIZE(mem_cgroup_files));

}

static void mem_cgroup_move_task(struct cgroup_subsys *ss,

				struct cgroup *cont,

				struct cgroup *old_cont,

				struct task_struct *p)

{

	struct mm_struct *mm;

	struct mem_cgroup *mem, *old_mem;

	mm = get_task_mm(p);

	if (mm == NULL)

		return;

	mem = mem_cgroup_from_cont(cont);

	old_mem = mem_cgroup_from_cont(old_cont);

	if (mem == old_mem)

		goto out;

	/*

	 * Only thread group leaders are allowed to migrate, the mm_struct is

	 * in effect owned by the leader

	 */

	if (p->tgid != p->pid)

		goto out;

	css_get(&mem->css);

	rcu_assign_pointer(mm->mem_cgroup, mem);

	css_put(&old_mem->css);

out:

	mmput(mm);

	return;

}

struct cgroup_subsys mem_cgroup_subsys = {

	.name = "memory",

	.subsys_id = mem_cgroup_subsys_id,

	.create = mem_cgroup_create,

	.destroy = mem_cgroup_destroy,

	.populate = mem_cgroup_populate,

	.attach = mem_cgroup_move_task,

	.early_init = 1,

};