From 5347e5ae13710420eebbbd0b22c045685704da80 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Mon, 8 Jul 2013 16:00:30 -0700 Subject: memcg: use css_get() in sock_update_memcg() Use css_get/css_put instead of mem_cgroup_get/put. Note, if at the same time someone is moving @current to a different cgroup and removing the old cgroup, css_tryget() may return false, and sock->sk_cgrp won't be initialized, which is fine. Signed-off-by: Li Zefan Acked-by: KAMEZAWA Hiroyuki Acked-by: Michal Hocko Cc: Hugh Dickins Cc: Tejun Heo Cc: Glauber Costa Cc: Johannes Weiner Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/memcontrol.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'mm/memcontrol.c') diff --git a/mm/memcontrol.c b/mm/memcontrol.c index bdeb82ca6c20..4c31a21a55be 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -551,15 +551,15 @@ void sock_update_memcg(struct sock *sk) */ if (sk->sk_cgrp) { BUG_ON(mem_cgroup_is_root(sk->sk_cgrp->memcg)); - mem_cgroup_get(sk->sk_cgrp->memcg); + css_get(&sk->sk_cgrp->memcg->css); return; } rcu_read_lock(); memcg = mem_cgroup_from_task(current); cg_proto = sk->sk_prot->proto_cgroup(memcg); - if (!mem_cgroup_is_root(memcg) && memcg_proto_active(cg_proto)) { - mem_cgroup_get(memcg); + if (!mem_cgroup_is_root(memcg) && + memcg_proto_active(cg_proto) && css_tryget(&memcg->css)) { sk->sk_cgrp = cg_proto; } rcu_read_unlock(); @@ -573,7 +573,7 @@ void sock_release_memcg(struct sock *sk) struct mem_cgroup *memcg; WARN_ON(!sk->sk_cgrp->memcg); memcg = sk->sk_cgrp->memcg; - mem_cgroup_put(memcg); + css_put(&sk->sk_cgrp->memcg->css); } } -- cgit v1.2.3-59-g8ed1b