diff options
| -rw-r--r-- | mm/slab.c | 45 | ||||
| -rw-r--r-- | mm/slab.h | 3 | ||||
| -rw-r--r-- | mm/slab_common.c | 25 | ||||
| -rw-r--r-- | mm/slob.c | 15 | ||||
| -rw-r--r-- | mm/slub.c | 36 |
5 files changed, 49 insertions, 75 deletions
@@ -2206,7 +2206,7 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) } } -static void __kmem_cache_destroy(struct kmem_cache *cachep) +void __kmem_cache_destroy(struct kmem_cache *cachep) { int i; struct kmem_list3 *l3; @@ -2763,49 +2763,10 @@ int kmem_cache_shrink(struct kmem_cache *cachep) } EXPORT_SYMBOL(kmem_cache_shrink); -/** - * kmem_cache_destroy - delete a cache - * @cachep: the cache to destroy - * - * Remove a &struct kmem_cache object from the slab cache. - * - * It is expected this function will be called by a module when it is - * unloaded. This will remove the cache completely, and avoid a duplicate - * cache being allocated each time a module is loaded and unloaded, if the - * module doesn't have persistent in-kernel storage across loads and unloads. - * - * The cache must be empty before calling this function. - * - * The caller must guarantee that no one will allocate memory from the cache - * during the kmem_cache_destroy(). - */ -void kmem_cache_destroy(struct kmem_cache *cachep) +int __kmem_cache_shutdown(struct kmem_cache *cachep) { - BUG_ON(!cachep || in_interrupt()); - - /* Find the cache in the chain of caches. */ - get_online_cpus(); - mutex_lock(&slab_mutex); - /* - * the chain is never empty, cache_cache is never destroyed - */ - list_del(&cachep->list); - if (__cache_shrink(cachep)) { - slab_error(cachep, "Can't free all objects"); - list_add(&cachep->list, &slab_caches); - mutex_unlock(&slab_mutex); - put_online_cpus(); - return; - } - - if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) - rcu_barrier(); - - __kmem_cache_destroy(cachep); - mutex_unlock(&slab_mutex); - put_online_cpus(); + return __cache_shrink(cachep); } -EXPORT_SYMBOL(kmem_cache_destroy); /* * Get the memory for a slab management obj. @@ -30,4 +30,7 @@ extern struct list_head slab_caches; struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); +int __kmem_cache_shutdown(struct kmem_cache *); +void __kmem_cache_destroy(struct kmem_cache *); + #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index 5190a7c..a1c4f0b 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -140,6 +140,31 @@ out_locked: } EXPORT_SYMBOL(kmem_cache_create); +void kmem_cache_destroy(struct kmem_cache *s) +{ + get_online_cpus(); + mutex_lock(&slab_mutex); + s->refcount--; + if (!s->refcount) { + list_del(&s->list); + + if (!__kmem_cache_shutdown(s)) { + if (s->flags & SLAB_DESTROY_BY_RCU) + rcu_barrier(); + + __kmem_cache_destroy(s); + } else { + list_add(&s->list, &slab_caches); + printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n", + s->name); + dump_stack(); + } + } + mutex_unlock(&slab_mutex); + put_online_cpus(); +} +EXPORT_SYMBOL(kmem_cache_destroy); + int slab_is_available(void) { return slab_state >= UP; @@ -538,18 +538,11 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, return c; } -void kmem_cache_destroy(struct kmem_cache *c) +void __kmem_cache_destroy(struct kmem_cache *c) { - mutex_lock(&slab_mutex); - list_del(&c->list); - mutex_unlock(&slab_mutex); - kmemleak_free(c); - if (c->flags & SLAB_DESTROY_BY_RCU) - rcu_barrier(); slob_free(c, sizeof(struct kmem_cache)); } -EXPORT_SYMBOL(kmem_cache_destroy); void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) { @@ -617,6 +610,12 @@ unsigned int kmem_cache_size(struct kmem_cache *c) } EXPORT_SYMBOL(kmem_cache_size); +int __kmem_cache_shutdown(struct kmem_cache *c) +{ + /* No way to check for remaining objects */ + return 0; +} + int kmem_cache_shrink(struct kmem_cache *d) { return 0; @@ -624,7 +624,7 @@ static void object_err(struct kmem_cache *s, struct page *page, print_trailer(s, page, object); } -static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...) +static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...) { va_list args; char buf[100]; @@ -3146,7 +3146,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page, sizeof(long), GFP_ATOMIC); if (!map) return; - slab_err(s, page, "%s", text); + slab_err(s, page, text, s->name); slab_lock(page); get_map(s, page, map); @@ -3178,7 +3178,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) discard_slab(s, page); } else { list_slab_objects(s, page, - "Objects remaining on kmem_cache_close()"); + "Objects remaining in %s on kmem_cache_close()"); } } } @@ -3191,7 +3191,6 @@ static inline int kmem_cache_close(struct kmem_cache *s) int node; flush_all(s); - free_percpu(s->cpu_slab); /* Attempt to free all objects */ for_each_node_state(node, N_NORMAL_MEMORY) { struct kmem_cache_node *n = get_node(s, node); @@ -3200,33 +3199,20 @@ static inline int kmem_cache_close(struct kmem_cache *s) if (n->nr_partial || slabs_node(s, node)) return 1; } + free_percpu(s->cpu_slab); free_kmem_cache_nodes(s); return 0; } -/* - * Close a cache and release the kmem_cache structure - * (must be used for caches created using kmem_cache_create) - */ -void kmem_cache_destroy(struct kmem_cache *s) +int __kmem_cache_shutdown(struct kmem_cache *s) { - mutex_lock(&slab_mutex); - s->refcount--; - if (!s->refcount) { - list_del(&s->list); - mutex_unlock(&slab_mutex); - if (kmem_cache_close(s)) { - printk(KERN_ERR "SLUB %s: %s called for cache that " - "still has objects.\n", s->name, __func__); - dump_stack(); - } - if (s->flags & SLAB_DESTROY_BY_RCU) - rcu_barrier(); - sysfs_slab_remove(s); - } else - mutex_unlock(&slab_mutex); + return kmem_cache_close(s); +} + +void __kmem_cache_destroy(struct kmem_cache *s) +{ + sysfs_slab_remove(s); } -EXPORT_SYMBOL(kmem_cache_destroy); /******************************************************************** * Kmalloc subsystem |
