mem_cgroup_private_id
struct mem_cgroup_private_id id;
mem_cgroup_private_id(swap_memcg));
mem_cgroup_private_id(memcg));
memcg_id = mem_cgroup_private_id(memcg);
memcgid = mem_cgroup_private_id(lruvec_memcg(lruvec));