diff options
| -rw-r--r-- | mm/memcontrol.c | 34 |
1 files changed, 14 insertions, 20 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index a86e7b445800..975ba766c16f 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -1086,19 +1086,6 @@ struct mem_cgroup *get_mem_cgroup_from_mm(struct mm_struct *mm) } EXPORT_SYMBOL(get_mem_cgroup_from_mm); -static __always_inline bool memcg_kmem_bypass(void) -{ - /* Allow remote memcg charging from any context. */ - if (unlikely(active_memcg())) - return false; - - /* Memcg to charge can't be determined. */ - if (!in_task() || !current->mm || (current->flags & PF_KTHREAD)) - return true; - - return false; -} - /** * get_mem_cgroup_from_current - Obtain a reference on current task's memcg. */ @@ -3089,7 +3076,7 @@ static struct obj_cgroup *__get_obj_cgroup_from_memcg(struct mem_cgroup *memcg) for (; !mem_cgroup_is_root(memcg); memcg = parent_mem_cgroup(memcg)) { objcg = rcu_dereference(memcg->objcg); - if (objcg && obj_cgroup_tryget(objcg)) + if (likely(objcg && obj_cgroup_tryget(objcg))) break; objcg = NULL; } @@ -3098,16 +3085,23 @@ static struct obj_cgroup *__get_obj_cgroup_from_memcg(struct mem_cgroup *memcg) __always_inline struct obj_cgroup *get_obj_cgroup_from_current(void) { - struct obj_cgroup *objcg = NULL; struct mem_cgroup *memcg; + struct obj_cgroup *objcg; - if (memcg_kmem_bypass()) - return NULL; + if (in_task()) { + memcg = current->active_memcg; + + /* Memcg to charge can't be determined. */ + if (likely(!memcg) && (!current->mm || (current->flags & PF_KTHREAD))) + return NULL; + } else { + memcg = this_cpu_read(int_active_memcg); + if (likely(!memcg)) + return NULL; + } rcu_read_lock(); - if (unlikely(active_memcg())) - memcg = active_memcg(); - else + if (!memcg) memcg = mem_cgroup_from_task(current); objcg = __get_obj_cgroup_from_memcg(memcg); rcu_read_unlock(); |