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slab: use the lock on alien_cache, instead of the lock on array_cache 

Now, we have separate alien_cache structure, so it'd be better to hold
the lock on alien_cache while manipulating alien_cache.  After that, we
don't need the lock on array_cache, so remove it.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2014-08-06 16:04:31 -07:00 committed by Linus Torvalds
parent c8522a3a58
commit 49dfc304ba
1 changed files with 8 additions and 17 deletions
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25
mm/slab.c
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@ -191,7 +191,6 @@ struct array_cache {
unsigned int limit;
unsigned int batchcount;
unsigned int touched;
spinlock_t lock;
void *entry[]; /*
* Must have this definition in here for the proper
* alignment of array_cache. Also simplifies accessing
@ -512,7 +511,7 @@ static void slab_set_lock_classes(struct kmem_cache *cachep,
return;
for_each_node(r) {
if (alc[r])
lockdep_set_class(&(alc[r]->ac.lock), alc_key);
lockdep_set_class(&(alc[r]->lock), alc_key);
}
}
@ -811,7 +810,6 @@ static void init_arraycache(struct array_cache *ac, int limit, int batch)
ac->limit = limit;
ac->batchcount = batch;
ac->touched = 0;
spin_lock_init(&ac->lock);
}
}
@ -1010,6 +1008,7 @@ static struct alien_cache *__alloc_alien_cache(int node, int entries,
alc = kmalloc_node(memsize, gfp, node);
init_arraycache(&alc->ac, entries, batch);
spin_lock_init(&alc->lock);
return alc;
}
@ -1086,9 +1085,9 @@ static void reap_alien(struct kmem_cache *cachep, struct kmem_cache_node *n)
if (alc) {
ac = &alc->ac;
if (ac->avail && spin_trylock_irq(&ac->lock)) {
if (ac->avail && spin_trylock_irq(&alc->lock)) {
__drain_alien_cache(cachep, ac, node);
spin_unlock_irq(&ac->lock);
spin_unlock_irq(&alc->lock);
}
}
}
@ -1106,9 +1105,9 @@ static void drain_alien_cache(struct kmem_cache *cachep,
alc = alien[i];
if (alc) {
ac = &alc->ac;
spin_lock_irqsave(&ac->lock, flags);
spin_lock_irqsave(&alc->lock, flags);
__drain_alien_cache(cachep, ac, i);
spin_unlock_irqrestore(&ac->lock, flags);
spin_unlock_irqrestore(&alc->lock, flags);
}
}
}
@ -1136,13 +1135,13 @@ static inline int cache_free_alien(struct kmem_cache *cachep, void *objp)
if (n->alien && n->alien[nodeid]) {
alien = n->alien[nodeid];
ac = &alien->ac;
spin_lock(&ac->lock);
spin_lock(&alien->lock);
if (unlikely(ac->avail == ac->limit)) {
STATS_INC_ACOVERFLOW(cachep);
__drain_alien_cache(cachep, ac, nodeid);
}
ac_put_obj(cachep, ac, objp);
spin_unlock(&ac->lock);
spin_unlock(&alien->lock);
} else {
n = get_node(cachep, nodeid);
spin_lock(&n->list_lock);
@ -1613,10 +1612,6 @@ void __init kmem_cache_init(void)
memcpy(ptr, cpu_cache_get(kmem_cache),
sizeof(struct arraycache_init));
/*
* Do not assume that spinlocks can be initialized via memcpy:
*/
spin_lock_init(&ptr->lock);
kmem_cache->array[smp_processor_id()] = ptr;
@ -1626,10 +1621,6 @@ void __init kmem_cache_init(void)
!= &initarray_generic.cache);
memcpy(ptr, cpu_cache_get(kmalloc_caches[INDEX_AC]),
sizeof(struct arraycache_init));
/*
* Do not assume that spinlocks can be initialized via memcpy:
*/
spin_lock_init(&ptr->lock);
kmalloc_caches[INDEX_AC]->array[smp_processor_id()] = ptr;
}