diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/slab.c | 21 |
1 files changed, 12 insertions, 9 deletions
diff --git a/mm/slab.c b/mm/slab.c index 3274144c0d1..6b691ecbac4 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3521,7 +3521,8 @@ static void enable_cpucache(struct kmem_cache *cachep) /* * Drain an array if it contains any elements taking the l3 lock only if - * necessary. + * necessary. Note that the l3 listlock also protects the array_cache + * if drain_array() is used on the shared array. */ void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, struct array_cache *ac, int force, int node) @@ -3532,16 +3533,18 @@ void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, return; if (ac->touched && !force) { ac->touched = 0; - } else if (ac->avail) { - tofree = force ? ac->avail : (ac->limit + 4) / 5; - if (tofree > ac->avail) - tofree = (ac->avail + 1) / 2; + } else { spin_lock_irq(&l3->list_lock); - free_block(cachep, ac->entry, tofree, node); + if (ac->avail) { + tofree = force ? ac->avail : (ac->limit + 4) / 5; + if (tofree > ac->avail) + tofree = (ac->avail + 1) / 2; + free_block(cachep, ac->entry, tofree, node); + ac->avail -= tofree; + memmove(ac->entry, &(ac->entry[tofree]), + sizeof(void *) * ac->avail); + } spin_unlock_irq(&l3->list_lock); - ac->avail -= tofree; - memmove(ac->entry, &(ac->entry[tofree]), - sizeof(void *) * ac->avail); } } |