diff options
| -rw-r--r-- | include/linux/memcontrol.h | 5 | ||||
| -rw-r--r-- | mm/memcontrol.c | 10 |
2 files changed, 8 insertions, 7 deletions
diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 4b975111b536..1f467fb620fe 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -197,7 +197,7 @@ struct obj_cgroup { struct mem_cgroup *memcg; atomic_t nr_charged_bytes; union { - struct list_head list; + struct list_head list; /* protected by objcg_lock */ struct rcu_head rcu; }; }; @@ -300,7 +300,8 @@ struct mem_cgroup { int kmemcg_id; enum memcg_kmem_state kmem_state; struct obj_cgroup __rcu *objcg; - struct list_head objcg_list; /* list of inherited objcgs */ + /* list of inherited objcgs, protected by objcg_lock */ + struct list_head objcg_list; #endif MEMCG_PADDING(_pad2_); diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 4bb2a4c593f7..dbe07fef2682 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -250,7 +250,7 @@ struct cgroup_subsys_state *vmpressure_to_css(struct vmpressure *vmpr) } #ifdef CONFIG_MEMCG_KMEM -extern spinlock_t css_set_lock; +static DEFINE_SPINLOCK(objcg_lock); static void obj_cgroup_release(struct percpu_ref *ref) { @@ -284,13 +284,13 @@ static void obj_cgroup_release(struct percpu_ref *ref) WARN_ON_ONCE(nr_bytes & (PAGE_SIZE - 1)); nr_pages = nr_bytes >> PAGE_SHIFT; - spin_lock_irqsave(&css_set_lock, flags); + spin_lock_irqsave(&objcg_lock, flags); memcg = obj_cgroup_memcg(objcg); if (nr_pages) __memcg_kmem_uncharge(memcg, nr_pages); list_del(&objcg->list); mem_cgroup_put(memcg); - spin_unlock_irqrestore(&css_set_lock, flags); + spin_unlock_irqrestore(&objcg_lock, flags); percpu_ref_exit(ref); kfree_rcu(objcg, rcu); @@ -322,7 +322,7 @@ static void memcg_reparent_objcgs(struct mem_cgroup *memcg, objcg = rcu_replace_pointer(memcg->objcg, NULL, true); - spin_lock_irq(&css_set_lock); + spin_lock_irq(&objcg_lock); /* Move active objcg to the parent's list */ xchg(&objcg->memcg, parent); @@ -337,7 +337,7 @@ static void memcg_reparent_objcgs(struct mem_cgroup *memcg, } list_splice(&memcg->objcg_list, &parent->objcg_list); - spin_unlock_irq(&css_set_lock); + spin_unlock_irq(&objcg_lock); percpu_ref_kill(&objcg->refcnt); } |