diff options
| -rw-r--r-- | mm/memcontrol.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2d1e5220688c..f50600187f4c 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -6360,11 +6360,24 @@ static void mem_cgroup_invalidate_reclaim_iterators(struct mem_cgroup *memcg) static void mem_cgroup_css_offline(struct cgroup_subsys_state *css) { struct mem_cgroup *memcg = mem_cgroup_from_css(css); + struct cgroup_subsys_state *iter; kmem_cgroup_css_offline(memcg); mem_cgroup_invalidate_reclaim_iterators(memcg); - mem_cgroup_reparent_charges(memcg); + + /* + * This requires that offlining is serialized. Right now that is + * guaranteed because css_killed_work_fn() holds the cgroup_mutex. + */ + rcu_read_lock(); + css_for_each_descendant_post(iter, css) { + rcu_read_unlock(); + mem_cgroup_reparent_charges(mem_cgroup_from_css(iter)); + rcu_read_lock(); + } + rcu_read_unlock(); + mem_cgroup_destroy_all_caches(memcg); vmpressure_cleanup(&memcg->vmpressure); } |