diff options
| -rw-r--r-- | mm/memcontrol.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 08541f680d9..57b16083f04 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1647,13 +1647,13 @@ static void move_unlock_mem_cgroup(struct mem_cgroup *memcg, */ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) { - struct cgroup *task_cgrp; - struct cgroup *mem_cgrp; /* - * Need a buffer in BSS, can't rely on allocations. The code relies - * on the assumption that OOM is serialized for memory controller. - * If this assumption is broken, revisit this code. + * protects memcg_name and makes sure that parallel ooms do not + * interleave */ + static DEFINE_SPINLOCK(oom_info_lock); + struct cgroup *task_cgrp; + struct cgroup *mem_cgrp; static char memcg_name[PATH_MAX]; int ret; struct mem_cgroup *iter; @@ -1662,6 +1662,7 @@ void mem_cgroup_print_oom_info(struct mem_cgroup *memcg, struct task_struct *p) if (!p) return; + spin_lock(&oom_info_lock); rcu_read_lock(); mem_cgrp = memcg->css.cgroup; @@ -1730,6 +1731,7 @@ done: pr_cont("\n"); } + spin_unlock(&oom_info_lock); } /* |