diff options
Diffstat (limited to 'mm/slab.c')
| -rw-r--r-- | mm/slab.c | 864 |
1 files changed, 330 insertions, 534 deletions
diff --git a/mm/slab.c b/mm/slab.c index 3070b929a1bf..eb2b2ea30130 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -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 @@ -203,6 +202,11 @@ struct array_cache { */ }; +struct alien_cache { + spinlock_t lock; + struct array_cache ac; +}; + #define SLAB_OBJ_PFMEMALLOC 1 static inline bool is_obj_pfmemalloc(void *objp) { @@ -233,22 +237,21 @@ struct arraycache_init { /* * Need this for bootstrapping a per node allocator. */ -#define NUM_INIT_LISTS (3 * MAX_NUMNODES) +#define NUM_INIT_LISTS (2 * MAX_NUMNODES) static struct kmem_cache_node __initdata init_kmem_cache_node[NUM_INIT_LISTS]; #define CACHE_CACHE 0 -#define SIZE_AC MAX_NUMNODES -#define SIZE_NODE (2 * MAX_NUMNODES) +#define SIZE_NODE (MAX_NUMNODES) static int drain_freelist(struct kmem_cache *cache, struct kmem_cache_node *n, int tofree); static void free_block(struct kmem_cache *cachep, void **objpp, int len, - int node); + int node, struct list_head *list); +static void slabs_destroy(struct kmem_cache *cachep, struct list_head *list); static int enable_cpucache(struct kmem_cache *cachep, gfp_t gfp); static void cache_reap(struct work_struct *unused); static int slab_early_init = 1; -#define INDEX_AC kmalloc_index(sizeof(struct arraycache_init)) #define INDEX_NODE kmalloc_index(sizeof(struct kmem_cache_node)) static void kmem_cache_node_init(struct kmem_cache_node *parent) @@ -267,7 +270,7 @@ static void kmem_cache_node_init(struct kmem_cache_node *parent) #define MAKE_LIST(cachep, listp, slab, nodeid) \ do { \ INIT_LIST_HEAD(listp); \ - list_splice(&(cachep->node[nodeid]->slab), listp); \ + list_splice(&get_node(cachep, nodeid)->slab, listp); \ } while (0) #define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ @@ -453,9 +456,6 @@ static inline unsigned int obj_to_index(const struct kmem_cache *cache, return reciprocal_divide(offset, cache->reciprocal_buffer_size); } -static struct arraycache_init initarray_generic = - { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; - /* internal cache of cache description objs */ static struct kmem_cache kmem_cache_boot = { .batchcount = 1, @@ -467,146 +467,11 @@ static struct kmem_cache kmem_cache_boot = { #define BAD_ALIEN_MAGIC 0x01020304ul -#ifdef CONFIG_LOCKDEP - -/* - * Slab sometimes uses the kmalloc slabs to store the slab headers - * for other slabs "off slab". - * The locking for this is tricky in that it nests within the locks - * of all other slabs in a few places; to deal with this special - * locking we put on-slab caches into a separate lock-class. - * - * We set lock class for alien array caches which are up during init. - * The lock annotation will be lost if all cpus of a node goes down and - * then comes back up during hotplug - */ -static struct lock_class_key on_slab_l3_key; -static struct lock_class_key on_slab_alc_key; - -static struct lock_class_key debugobj_l3_key; -static struct lock_class_key debugobj_alc_key; - -static void slab_set_lock_classes(struct kmem_cache *cachep, - struct lock_class_key *l3_key, struct lock_class_key *alc_key, - int q) -{ - struct array_cache **alc; - struct kmem_cache_node *n; - int r; - - n = cachep->node[q]; - if (!n) - return; - - lockdep_set_class(&n->list_lock, l3_key); - alc = n->alien; - /* - * FIXME: This check for BAD_ALIEN_MAGIC - * should go away when common slab code is taught to - * work even without alien caches. - * Currently, non NUMA code returns BAD_ALIEN_MAGIC - * for alloc_alien_cache, - */ - if (!alc || (unsigned long)alc == BAD_ALIEN_MAGIC) - return; - for_each_node(r) { - if (alc[r]) - lockdep_set_class(&alc[r]->lock, alc_key); - } -} - -static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node) -{ - slab_set_lock_classes(cachep, &debugobj_l3_key, &debugobj_alc_key, node); -} - -static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep) -{ - int node; - - for_each_online_node(node) - slab_set_debugobj_lock_classes_node(cachep, node); -} - -static void init_node_lock_keys(int q) -{ - int i; - - if (slab_state < UP) - return; - - for (i = 1; i <= KMALLOC_SHIFT_HIGH; i++) { - struct kmem_cache_node *n; - struct kmem_cache *cache = kmalloc_caches[i]; - - if (!cache) - continue; - - n = cache->node[q]; - if (!n || OFF_SLAB(cache)) - continue; - - slab_set_lock_classes(cache, &on_slab_l3_key, - &on_slab_alc_key, q); - } -} - -static void on_slab_lock_classes_node(struct kmem_cache *cachep, int q) -{ - if (!cachep->node[q]) - return; - - slab_set_lock_classes(cachep, &on_slab_l3_key, - &on_slab_alc_key, q); -} - -static inline void on_slab_lock_classes(struct kmem_cache *cachep) -{ - int node; - - VM_BUG_ON(OFF_SLAB(cachep)); - for_each_node(node) - on_slab_lock_classes_node(cachep, node); -} - -static inline void init_lock_keys(void) -{ - int node; - - for_each_node(node) - init_node_lock_keys(node); -} -#else -static void init_node_lock_keys(int q) -{ -} - -static inline void init_lock_keys(void) -{ -} - -static inline void on_slab_lock_classes(struct kmem_cache *cachep) -{ -} - -static inline void on_slab_lock_classes_node(struct kmem_cache *cachep, int node) -{ -} - -static void slab_set_debugobj_lock_classes_node(struct kmem_cache *cachep, int node) -{ -} - -static void slab_set_debugobj_lock_classes(struct kmem_cache *cachep) -{ -} -#endif - static DEFINE_PER_CPU(struct delayed_work, slab_reap_work); static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) { - return cachep->array[smp_processor_id()]; + return this_cpu_ptr(cachep->cpu_cache); } static size_t calculate_freelist_size(int nr_objs, size_t align) @@ -792,13 +657,8 @@ static void start_cpu_timer(int cpu) } } -static struct array_cache *alloc_arraycache(int node, int entries, - int batchcount, gfp_t gfp) +static void init_arraycache(struct array_cache *ac, int limit, int batch) { - int memsize = sizeof(void *) * entries + sizeof(struct array_cache); - struct array_cache *nc = NULL; - - nc = kmalloc_node(memsize, gfp, node); /* * The array_cache structures contain pointers to free object. * However, when such objects are allocated or transferred to another @@ -806,15 +666,24 @@ static struct array_cache *alloc_arraycache(int node, int entries, * valid references during a kmemleak scan. Therefore, kmemleak must * not scan such objects. */ - kmemleak_no_scan(nc); - if (nc) { - nc->avail = 0; - nc->limit = entries; - nc->batchcount = batchcount; - nc->touched = 0; - spin_lock_init(&nc->lock); + kmemleak_no_scan(ac); + if (ac) { + ac->avail = 0; + ac->limit = limit; + ac->batchcount = batch; + ac->touched = 0; } - return nc; +} + +static struct array_cache *alloc_arraycache(int node, int entries, + int batchcount, gfp_t gfp) +{ + size_t memsize = sizeof(void *) * entries + sizeof(struct array_cache); + struct array_cache *ac = NULL; + + ac = kmalloc_node(memsize, gfp, node); + init_arraycache(ac, entries, batchcount); + return ac; } static inline bool is_slab_pfmemalloc(struct page *page) @@ -826,7 +695,7 @@ static inline bool is_slab_pfmemalloc(struct page *page) static void recheck_pfmemalloc_active(struct kmem_cache *cachep, struct array_cache *ac) { - struct kmem_cache_node *n = cachep->node[numa_mem_id()]; + struct kmem_cache_node *n = get_node(cachep, numa_mem_id()); struct page *page; unsigned long flags; @@ -881,7 +750,7 @@ static void *__ac_get_obj(struct kmem_cache *cachep, struct array_cache *ac, * If there are empty slabs on the slabs_free list and we are * being forced to refill the cache, mark this one !pfmemalloc. */ - n = cachep->node[numa_mem_id()]; + n = get_node(cachep, numa_mem_id()); if (!list_empty(&n->slabs_free) && force_refill) { struct page *page = virt_to_head_page(objp); ClearPageSlabPfmemalloc(page); @@ -911,8 +780,8 @@ static inline void *ac_get_obj(struct kmem_cache *cachep, return objp; } -static void *__ac_put_obj(struct kmem_cache *cachep, struct array_cache *ac, - void *objp) +static noinline void *__ac_put_obj(struct kmem_cache *cachep, + struct array_cache *ac, void *objp) { if (unlikely(pfmemalloc_active)) { /* Some pfmemalloc slabs exist, check if this is one */ @@ -961,12 +830,13 @@ static int transfer_objects(struct array_cache *to, #define drain_alien_cache(cachep, alien) do { } while (0) #define reap_alien(cachep, n) do { } while (0) -static inline struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) +static inline struct alien_cache **alloc_alien_cache(int node, + int limit, gfp_t gfp) { - return (struct array_cache **)BAD_ALIEN_MAGIC; + return (struct alien_cache **)BAD_ALIEN_MAGIC; } -static inline void free_alien_cache(struct array_cache **ac_ptr) +static inline void free_alien_cache(struct alien_cache **ac_ptr) { } @@ -992,46 +862,60 @@ static inline void *____cache_alloc_node(struct kmem_cache *cachep, static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int); static void *alternate_node_alloc(struct kmem_cache *, gfp_t); -static struct array_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) +static struct alien_cache *__alloc_alien_cache(int node, int entries, + int batch, gfp_t gfp) +{ + size_t memsize = sizeof(void *) * entries + sizeof(struct alien_cache); + struct alien_cache *alc = NULL; + + alc = kmalloc_node(memsize, gfp, node); + init_arraycache(&alc->ac, entries, batch); + spin_lock_init(&alc->lock); + return alc; +} + +static struct alien_cache **alloc_alien_cache(int node, int limit, gfp_t gfp) { - struct array_cache **ac_ptr; - int memsize = sizeof(void *) * nr_node_ids; + struct alien_cache **alc_ptr; + size_t memsize = sizeof(void *) * nr_node_ids; int i; if (limit > 1) limit = 12; - ac_ptr = kzalloc_node(memsize, gfp, node); - if (ac_ptr) { - for_each_node(i) { - if (i == node || !node_online(i)) - continue; - ac_ptr[i] = alloc_arraycache(node, limit, 0xbaadf00d, gfp); - if (!ac_ptr[i]) { - for (i--; i >= 0; i--) - kfree(ac_ptr[i]); - kfree(ac_ptr); - return NULL; - } + alc_ptr = kzalloc_node(memsize, gfp, node); + if (!alc_ptr) + return NULL; + + for_each_node(i) { + if (i == node || !node_online(i)) + continue; + alc_ptr[i] = __alloc_alien_cache(node, limit, 0xbaadf00d, gfp); + if (!alc_ptr[i]) { + for (i--; i >= 0; i--) + kfree(alc_ptr[i]); + kfree(alc_ptr); + return NULL; } } - return ac_ptr; + return alc_ptr; } -static void free_alien_cache(struct array_cache **ac_ptr) +static void free_alien_cache(struct alien_cache **alc_ptr) { int i; - if (!ac_ptr) + if (!alc_ptr) return; for_each_node(i) - kfree(ac_ptr[i]); - kfree(ac_ptr); + kfree(alc_ptr[i]); + kfree(alc_ptr); } static void __drain_alien_cache(struct kmem_cache *cachep, - struct array_cache *ac, int node) + struct array_cache *ac, int node, + struct list_head *list) { - struct kmem_cache_node *n = cachep->node[node]; + struct kmem_cache_node *n = get_node(cachep, node); if (ac->avail) { spin_lock(&n->list_lock); @@ -1043,7 +927,7 @@ static void __drain_alien_cache(struct kmem_cache *cachep, if (n->shared) transfer_objects(n->shared, ac, ac->limit); - free_block(cachep, ac->entry, ac->avail, node); + free_block(cachep, ac->entry, ac->avail, node, list); ac->avail = 0; spin_unlock(&n->list_lock); } @@ -1057,66 +941,88 @@ static void reap_alien(struct kmem_cache *cachep, struct kmem_cache_node *n) int node = __this_cpu_read(slab_reap_node); if (n->alien) { - struct array_cache *ac = n->alien[node]; + struct alien_cache *alc = n->alien[node]; + struct array_cache *ac; + + if (alc) { + ac = &alc->ac; + if (ac->avail && spin_trylock_irq(&alc->lock)) { + LIST_HEAD(list); - if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { - __drain_alien_cache(cachep, ac, node); - spin_unlock_irq(&ac->lock); + __drain_alien_cache(cachep, ac, node, &list); + spin_unlock_irq(&alc->lock); + slabs_destroy(cachep, &list); + } } } } static void drain_alien_cache(struct kmem_cache *cachep, - struct array_cache **alien) + struct alien_cache **alien) { int i = 0; + struct alien_cache *alc; struct array_cache *ac; unsigned long flags; for_each_online_node(i) { - ac = alien[i]; - if (ac) { - spin_lock_irqsave(&ac->lock, flags); - __drain_alien_cache(cachep, ac, i); - spin_unlock_irqrestore(&ac->lock, flags); + alc = alien[i]; + if (alc) { + LIST_HEAD(list); + + ac = &alc->ac; + spin_lock_irqsave(&alc->lock, flags); + __drain_alien_cache(cachep, ac, i, &list); + spin_unlock_irqrestore(&alc->lock, flags); + slabs_destroy(cachep, &list); } } } -static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +static int __cache_free_alien(struct kmem_cache *cachep, void *objp, + int node, int page_node) { - int nodeid = page_to_nid(virt_to_page(objp)); struct kmem_cache_node *n; - struct array_cache *alien = NULL; - int node; - - node = numa_mem_id(); - - /* - * Make sure we are not freeing a object from another node to the array - * cache on this cpu. - */ - if (likely(nodeid == node)) - return 0; + struct alien_cache *alien = NULL; + struct array_cache *ac; + LIST_HEAD(list); - n = cachep->node[node]; + n = get_node(cachep, node); STATS_INC_NODEFREES(cachep); - if (n->alien && n->alien[nodeid]) { - alien = n->alien[nodeid]; + if (n->alien && n->alien[page_node]) { + alien = n->alien[page_node]; + ac = &alien->ac; spin_lock(&alien->lock); - if (unlikely(alien->avail == alien->limit)) { + if (unlikely(ac->avail == ac->limit)) { STATS_INC_ACOVERFLOW(cachep); - __drain_alien_cache(cachep, alien, nodeid); + __drain_alien_cache(cachep, ac, page_node, &list); } - ac_put_obj(cachep, alien, objp); + ac_put_obj(cachep, ac, objp); spin_unlock(&alien->lock); + slabs_destroy(cachep, &list); } else { - spin_lock(&(cachep->node[nodeid])->list_lock); - free_block(cachep, &objp, 1, nodeid); - spin_unlock(&(cachep->node[nodeid])->list_lock); + n = get_node(cachep, page_node); + spin_lock(&n->list_lock); + free_block(cachep, &objp, 1, page_node, &list); + spin_unlock(&n->list_lock); + slabs_destroy(cachep, &list); } return 1; } + +static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +{ + int page_node = page_to_nid(virt_to_page(objp)); + int node = numa_mem_id(); + /* + * Make sure we are not freeing a object from another node to the array + * cache on this cpu. + */ + if (likely(node == page_node)) + return 0; + + return __cache_free_alien(cachep, objp, node, page_node); +} #endif /* @@ -1132,7 +1038,7 @@ static int init_cache_node_node(int node) { struct kmem_cache *cachep; struct kmem_cache_node *n; - const int memsize = sizeof(struct kmem_cache_node); + const size_t memsize = sizeof(struct kmem_cache_node); list_for_each_entry(cachep, &slab_caches, list) { /* @@ -1140,7 +1046,8 @@ static int init_cache_node_node(int node) * begin anything. Make sure some other cpu on this * node has not already allocated this */ - if (!cachep->node[node]) { + n = get_node(cachep, node); + if (!n) { n = kmalloc_node(memsize, GFP_KERNEL, node); if (!n) return -ENOMEM; @@ -1156,11 +1063,11 @@ static int init_cache_node_node(int node) cachep->node[node] = n; } - spin_lock_irq(&cachep->node[node]->list_lock); - cachep->node[node]->free_limit = + spin_lock_irq(&n->list_lock); + n->free_limit = (1 + nr_cpus_node(node)) * cachep->batchcount + cachep->num; - spin_unlock_irq(&cachep->node[node]->list_lock); + spin_unlock_irq(&n->list_lock); } return 0; } @@ -1181,32 +1088,34 @@ static void cpuup_canceled(long cpu) list_for_each_entry(cachep, &slab_caches, list) { struct array_cache *nc; struct array_cache *shared; - struct array_cache **alien; - - /* cpu is dead; no one can alloc from it. */ - nc = cachep->array[cpu]; - cachep->array[cpu] = NULL; - n = cachep->node[node]; + struct alien_cache **alien; + LIST_HEAD(list); + n = get_node(cachep, node); if (!n) - goto free_array_cache; + continue; spin_lock_irq(&n->list_lock); /* Free limit for this kmem_cache_node */ n->free_limit -= cachep->batchcount; - if (nc) - free_block(cachep, nc->entry, nc->avail, node); + + /* cpu is dead; no one can alloc from it. */ + nc = per_cpu_ptr(cachep->cpu_cache, cpu); + if (nc) { + free_block(cachep, nc->entry, nc->avail, node, &list); + nc->avail = 0; + } if (!cpumask_empty(mask)) { spin_unlock_irq(&n->list_lock); - goto free_array_cache; + goto free_slab; } shared = n->shared; if (shared) { free_block(cachep, shared->entry, - shared->avail, node); + shared->avail, node, &list); n->shared = NULL; } @@ -1220,8 +1129,9 @@ static void cpuup_canceled(long cpu) drain_alien_cache(cachep, alien); free_alien_cache(alien); } -free_array_cache: - kfree(nc); + +free_slab: + slabs_destroy(cachep, &list); } /* * In the previous loop, all the objects were freed to @@ -1229,7 +1139,7 @@ free_array_cache: * shrink each nodelist to its limit. */ list_for_each_entry(cachep, &slab_caches, list) { - n = cachep->node[node]; + n = get_node(cachep, node); if (!n) continue; drain_freelist(cachep, n, slabs_tofree(cachep, n)); @@ -1258,33 +1168,24 @@ static int cpuup_prepare(long cpu) * array caches */ list_for_each_entry(cachep, &slab_caches, list) { - struct array_cache *nc; struct array_cache *shared = NULL; - struct array_cache **alien = NULL; + struct alien_cache **alien = NULL; - nc = alloc_arraycache(node, cachep->limit, - cachep->batchcount, GFP_KERNEL); - if (!nc) - goto bad; if (cachep->shared) { shared = alloc_arraycache(node, cachep->shared * cachep->batchcount, 0xbaadf00d, GFP_KERNEL); - if (!shared) { - kfree(nc); + if (!shared) goto bad; - } } if (use_alien_caches) { alien = alloc_alien_cache(node, cachep->limit, GFP_KERNEL); if (!alien) { kfree(shared); - kfree(nc); goto bad; } } - cachep->array[cpu] = nc; - n = cachep->node[node]; + n = get_node(cachep, node); BUG_ON(!n); spin_lock_irq(&n->list_lock); @@ -1305,13 +1206,7 @@ static int cpuup_prepare(long cpu) spin_unlock_irq(&n->list_lock); kfree(shared); free_alien_cache(alien); - if (cachep->flags & SLAB_DEBUG_OBJECTS) - slab_set_debugobj_lock_classes_node(cachep, node); - else if (!OFF_SLAB(cachep) && - !(cachep->flags & SLAB_DESTROY_BY_RCU)) - on_slab_lock_classes_node(cachep, node); } - init_node_lock_keys(node); return 0; bad: @@ -1395,7 +1290,7 @@ static int __meminit drain_cache_node_node(int node) list_for_each_entry(cachep, &slab_caches, list) { struct kmem_cache_node *n; - n = cachep->node[node]; + n = get_node(cachep, node); if (!n) continue; @@ -1481,15 +1376,6 @@ static void __init set_up_node(struct kmem_cache *cachep, int index) } /* - * The memory after the last cpu cache pointer is used for the - * the node pointer. - */ -static void setup_node_pointer(struct kmem_cache *cachep) -{ - cachep->node = (struct kmem_cache_node **)&cachep->array[nr_cpu_ids]; -} - -/* * Initialisation. Called after the page allocator have been initialised and * before smp_init(). */ @@ -1500,7 +1386,6 @@ void __init kmem_cache_init(void) BUILD_BUG_ON(sizeof(((struct page *)NULL)->lru) < sizeof(struct rcu_head)); kmem_cache = &kmem_cache_boot; - setup_node_pointer(kmem_cache); if (num_possible_nodes() == 1) use_alien_caches = 0; @@ -1508,8 +1393,6 @@ void __init kmem_cache_init(void) for (i = 0; i < NUM_INIT_LISTS; i++) kmem_cache_node_init(&init_kmem_cache_node[i]); - set_up_node(kmem_cache, CACHE_CACHE); - /* * Fragmentation resistance on low memory - only use bigger * page orders on machines with more than 32MB of memory if @@ -1544,57 +1427,22 @@ void __init kmem_cache_init(void) * struct kmem_cache size depends on nr_node_ids & nr_cpu_ids */ create_boot_cache(kmem_cache, "kmem_cache", - offsetof(struct kmem_cache, array[nr_cpu_ids]) + + offsetof(struct kmem_cache, node) + nr_node_ids * sizeof(struct kmem_cache_node *), SLAB_HWCACHE_ALIGN); list_add(&kmem_cache->list, &slab_caches); - - /* 2+3) create the kmalloc caches */ + slab_state = PARTIAL; /* - * Initialize the caches that provide memory for the array cache and the - * kmem_cache_node structures first. Without this, further allocations will - * bug. + * Initialize the caches that provide memory for the kmem_cache_node + * structures first. Without this, further allocations will bug. */ - - kmalloc_caches[INDEX_AC] = create_kmalloc_cache("kmalloc-ac", - kmalloc_size(INDEX_AC), ARCH_KMALLOC_FLAGS); - - if (INDEX_AC != INDEX_NODE) - kmalloc_caches[INDEX_NODE] = - create_kmalloc_cache("kmalloc-node", + kmalloc_caches[INDEX_NODE] = create_kmalloc_cache("kmalloc-node", kmalloc_size(INDEX_NODE), ARCH_KMALLOC_FLAGS); + slab_state = PARTIAL_NODE; slab_early_init = 0; - /* 4) Replace the bootstrap head arrays */ - { - struct array_cache *ptr; - - ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); - - 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; - - ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); - - BUG_ON(cpu_cache_get(kmalloc_caches[INDEX_AC]) - != &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; - } /* 5) Replace the bootstrap kmem_cache_node */ { int nid; @@ -1602,13 +1450,8 @@ void __init kmem_cache_init(void) for_each_online_node(nid) { init_list(kmem_cache, &init_kmem_cache_node[CACHE_CACHE + nid], nid); - init_list(kmalloc_caches[INDEX_AC], - &init_kmem_cache_node[SIZE_AC + nid], nid); - - if (INDEX_AC != INDEX_NODE) { - init_list(kmalloc_caches[INDEX_NODE], + init_list(kmalloc_caches[INDEX_NODE], &init_kmem_cache_node[SIZE_NODE + nid], nid); - } } } @@ -1628,9 +1471,6 @@ void __init kmem_cache_init_late(void) BUG(); mutex_unlock(&slab_mutex); - /* Annotate slab for lockdep -- annotate the malloc caches */ - init_lock_keys(); - /* Done! */ slab_state = FULL; @@ -1690,14 +1530,10 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid) printk(KERN_WARNING " cache: %s, object size: %d, order: %d\n", cachep->name, cachep->size, cachep->gfporder); - for_each_online_node(node) { + for_each_kmem_cache_node(cachep, node, n) { unsigned long active_objs = 0, num_objs = 0, free_objects = 0; unsigned long active_slabs = 0, num_slabs = 0; - n = cachep->node[node]; - if (!n) - continue; - spin_lock_irqsave(&n->list_lock, flags); list_for_each_entry(page, &n->slabs_full, lru) { active_objs += cachep->num; @@ -1724,7 +1560,8 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid) } /* - * Interface to system's page allocator. No need to hold the cache-lock. + * Interface to system's page allocator. No need to hold the + * kmem_cache_node ->list_lock. * * If we requested dmaable memory, we will get it. Even if we * did not request dmaable memory, we might get it, but that @@ -2026,9 +1863,9 @@ static void slab_destroy_debugcheck(struct kmem_cache *cachep, * @cachep: cache pointer being destroyed * @page: page pointer being destroyed * - * Destroy all the objs in a slab, and release the mem back to the system. - * Before calling the slab must have been unlinked from the cache. The - * cache-lock is not held/needed. + * Destroy all the objs in a slab page, and release the mem back to the system. + * Before calling the slab page must have been unlinked from the cache. The + * kmem_cache_node ->list_lock is not held/needed. */ static void slab_destroy(struct kmem_cache *cachep, struct page *page) { @@ -2060,6 +1897,16 @@ static void slab_destroy(struct kmem_cache *cachep, struct page *page) kmem_cache_free(cachep->freelist_cache, freelist); } +static void slabs_destroy(struct kmem_cache *cachep, struct list_head *list) +{ + struct page *page, *n; + + list_for_each_entry_safe(page, n, list, lru) { + list_del(&page->lru); + slab_destroy(cachep, page); + } +} + /** * calculate_slab_order - calculate size (page order) of slabs * @cachep: pointer to the cache that is being created @@ -2137,56 +1984,53 @@ static size_t calculate_slab_order(struct kmem_cache *cachep, return left_over; } +static struct array_cache __percpu *alloc_kmem_cache_cpus( + struct kmem_cache *cachep, int entries, int batchcount) +{ + int cpu; + size_t size; + struct array_cache __percpu *cpu_cache; + + size = sizeof(void *) * entries + sizeof(struct array_cache); + cpu_cache = __alloc_percpu(size, sizeof(void *)); + + if (!cpu_cache) + return NULL; + + for_each_possible_cpu(cpu) { + init_arraycache(per_cpu_ptr(cpu_cache, cpu), + entries, batchcount); + } + + return cpu_cache; +} + static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) { if (slab_state >= FULL) return enable_cpucache(cachep, gfp); + cachep->cpu_cache = alloc_kmem_cache_cpus(cachep, 1, 1); + if (!cachep->cpu_cache) + return 1; + if (slab_state == DOWN) { - /* - * Note: Creation of first cache (kmem_cache). - * The setup_node is taken care - * of by the caller of __kmem_cache_create - */ - cachep->array[smp_processor_id()] = &initarray_generic.cache; - slab_state = PARTIAL; + /* Creation of first cache (kmem_cache). */ + set_up_node(kmem_cache, CACHE_CACHE); } else if (slab_state == PARTIAL) { - /* - * Note: the second kmem_cache_create must create the cache - * that's used by kmalloc(24), otherwise the creation of - * further caches will BUG(). - */ - cachep->array[smp_processor_id()] = &initarray_generic.cache; - - /* - * If the cache that's used by kmalloc(sizeof(kmem_cache_node)) is - * the second cache, then we need to set up all its node/, - * otherwise the creation of further caches will BUG(). - */ - set_up_node(cachep, SIZE_AC); - if (INDEX_AC == INDEX_NODE) - slab_state = PARTIAL_NODE; - else - slab_state = PARTIAL_ARRAYCACHE; + /* For kmem_cache_node */ + set_up_node(cachep, SIZE_NODE); } else { - /* Remaining boot caches */ - cachep->array[smp_processor_id()] = - kmalloc(sizeof(struct arraycache_init), gfp); + int node; - if (slab_state == PARTIAL_ARRAYCACHE) { - set_up_node(cachep, SIZE_NODE); - slab_state = PARTIAL_NODE; - } else { - int node; - for_each_online_node(node) { - cachep->node[node] = - kmalloc_node(sizeof(struct kmem_cache_node), - gfp, node); - BUG_ON(!cachep->node[node]); - kmem_cache_node_init(cachep->node[node]); - } + for_each_online_node(node) { + cachep->node[node] = kmalloc_node( + sizeof(struct kmem_cache_node), gfp, node); + BUG_ON(!cachep->node[node]); + kmem_cache_node_init(cachep->node[node]); } } + cachep->node[numa_mem_id()]->next_reap = jiffies + REAPTIMEOUT_NODE + ((unsigned long)cachep) % REAPTIMEOUT_NODE; @@ -2200,6 +2044,32 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) return 0; } +unsigned long kmem_cache_flags(unsigned long object_size, + unsigned long flags, const char *name, + void (*ctor)(void *)) +{ + return flags; +} + +struct kmem_cache * +__kmem_cache_alias(const char *name, size_t size, size_t align, + unsigned long flags, void (*ctor)(void *)) +{ + struct kmem_cache *cachep; + + cachep = find_mergeable(size, align, flags, name, ctor); + if (cachep) { + cachep->refcount++; + + /* + * Adjust the object sizes so that we clear + * the complete object on kzalloc. + */ + cachep->object_size = max_t(int, cachep->object_size, size); + } + return cachep; +} + /** * __kmem_cache_create - Create a cache. * @cachep: cache management descriptor @@ -2224,7 +2094,8 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) int __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) { - size_t left_over, freelist_size, ralign; + size_t left_over, freelist_size; + size_t ralign = BYTES_PER_WORD; gfp_t gfp; int err; size_t size = cachep->size; @@ -2257,14 +2128,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) size &= ~(BYTES_PER_WORD - 1); } - /* - * Redzoning and user store require word alignment or possibly larger. - * Note this will be overridden by architecture or caller mandated - * alignment if either is greater than BYTES_PER_WORD. - */ - if (flags & SLAB_STORE_USER) - ralign = BYTES_PER_WORD; - if (flags & SLAB_RED_ZONE) { ralign = REDZONE_ALIGN; /* If redzoning, ensure that the second redzone is suitably @@ -2290,7 +2153,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) else gfp = GFP_NOWAIT; - setup_node_pointer(cachep); #if DEBUG /* @@ -2405,17 +2267,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) return err; } - if (flags & SLAB_DEBUG_OBJECTS) { - /* - * Would deadlock through slab_destroy()->call_rcu()-> - * debug_object_activate()->kmem_cache_alloc(). - */ - WARN_ON_ONCE(flags & SLAB_DESTROY_BY_RCU); - - slab_set_debugobj_lock_classes(cachep); - } else if (!OFF_SLAB(cachep) && !(flags & SLAB_DESTROY_BY_RCU)) - on_slab_lock_classes(cachep); - return 0; } @@ -2434,7 +2285,7 @@ static void check_spinlock_acquired(struct kmem_cache *cachep) { #ifdef CONFIG_SMP check_irq_off(); - assert_spin_locked(&cachep->node[numa_mem_id()]->list_lock); + assert_spin_locked(&get_node(cachep, numa_mem_id())->list_lock); #endif } @@ -2442,7 +2293,7 @@ static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) { #ifdef CONFIG_SMP check_irq_off(); - assert_spin_locked(&cachep->node[node]->list_lock); + assert_spin_locked(&get_node(cachep, node)->list_lock); #endif } @@ -2462,12 +2313,16 @@ static void do_drain(void *arg) struct kmem_cache *cachep = arg; struct array_cache *ac; int node = numa_mem_id(); + struct kmem_cache_node *n; + LIST_HEAD(list); check_irq_off(); ac = cpu_cache_get(cachep); - spin_lock(&cachep->node[node]->list_lock); - free_block(cachep, ac->entry, ac->avail, node); - spin_unlock(&cachep->node[node]->list_lock); + n = get_node(cachep, node); + spin_lock(&n->list_lock); + free_block(cachep, ac->entry, ac->avail, node, &list); + spin_unlock(&n->list_lock); + slabs_destroy(cachep, &list); ac->avail = 0; } @@ -2478,17 +2333,12 @@ static void drain_cpu_caches(struct kmem_cache *cachep) on_each_cpu(do_drain, cachep, 1); check_irq_on(); - for_each_online_node(node) { - n = cachep->node[node]; - if (n && n->alien) + for_each_kmem_cache_node(cachep, node, n) + if (n->alien) drain_alien_cache(cachep, n->alien); - } - for_each_online_node(node) { - n = cachep->node[node]; - if (n) - drain_array(cachep, n, n->shared, 1, node); - } + for_each_kmem_cache_node(cachep, node, n) + drain_array(cachep, n, n->shared, 1, node); } /* @@ -2534,17 +2384,14 @@ out: int __kmem_cache_shrink(struct kmem_cache *cachep) { - int ret = 0, i = 0; + int ret = 0; + int node; struct kmem_cache_node *n; drain_cpu_caches(cachep); check_irq_on(); - for_each_online_node(i) { - n = cachep->node[i]; - if (!n) - continue; - + for_each_kmem_cache_node(cachep, node, n) { drain_freelist(cachep, n, slabs_tofree(cachep, n)); ret += !list_empty(&n->slabs_full) || @@ -2562,17 +2409,14 @@ int __kmem_cache_shutdown(struct kmem_cache *cachep) if (rc) return rc; - for_each_online_cpu(i) - kfree(cachep->array[i]); + free_percpu(cachep->cpu_cache); /* NUMA: free the node structures */ - for_each_online_node(i) { - n = cachep->node[i]; - if (n) { - kfree(n->shared); - free_alien_cache(n->alien); - kfree(n); - } + for_each_kmem_cache_node(cachep, i, n) { + kfree(n->shared); + free_alien_cache(n->alien); + kfree(n); + cachep->node[i] = NULL; } return 0; } @@ -2751,7 +2595,7 @@ static int cache_grow(struct kmem_cache *cachep, /* Take the node list lock to change the colour_next on this node */ check_irq_off(); - n = cachep->node[nodeid]; + n = get_node(cachep, nodeid); spin_lock(&n->list_lock); /* Get colour for the slab, and cal the next value. */ @@ -2920,7 +2764,7 @@ retry: */ batchcount = BATCHREFILL_LIMIT; } - n = cachep->node[node]; + n = get_node(cachep, node); BUG_ON(ac->avail > 0 || !n); spin_lock(&n->list_lock); @@ -3060,7 +2904,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags) { - if (cachep == kmem_cache) + if (unlikely(cachep == kmem_cache)) return false; return should_failslab(cachep->object_size, flags, cachep->flags); @@ -3111,7 +2955,7 @@ out: #ifdef CONFIG_NUMA /* - * Try allocating on another node if PF_SPREAD_SLAB is a mempolicy is set. + * Try allocating on another node if PFA_SPREAD_SLAB is a mempolicy is set. * * If we are in_interrupt, then process context, including cpusets and * mempolicy, may not apply and should not be used for allocation policy. @@ -3169,8 +3013,8 @@ retry: nid = zone_to_nid(zone); if (cpuset_zone_allowed_hardwall(zone, flags) && - cache->node[nid] && - cache->node[nid]->free_objects) { + get_node(cache, nid) && + get_node(cache, nid)->free_objects) { obj = ____cache_alloc_node(cache, flags | GFP_THISNODE, nid); if (obj) @@ -3233,7 +3077,7 @@ static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int x; VM_BUG_ON(nodeid > num_online_nodes()); - n = cachep->node[nodeid]; + n = get_node(cachep, nodeid); BUG_ON(!n); retry: @@ -3304,7 +3148,7 @@ slab_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid, if (nodeid == NUMA_NO_NODE) nodeid = slab_node; - if (unlikely(!cachep->node[nodeid])) { + if (unlikely(!get_node(cachep, nodeid))) { /* Node not bootstrapped yet */ ptr = fallback_alloc(cachep, flags); goto out; @@ -3343,7 +3187,7 @@ __do_cache_alloc(struct kmem_cache *cache, gfp_t flags) { void *objp; - if (current->mempolicy || unlikely(current->flags & PF_SPREAD_SLAB)) { + if (current->mempolicy || cpuset_do_slab_mem_spread()) { objp = alternate_node_alloc(cache, flags); if (objp) goto out; @@ -3405,12 +3249,13 @@ slab_alloc(struct kmem_cache *cachep, gfp_t flags, unsigned long caller) /* * Caller needs to acquire correct kmem_cache_node's list_lock + * @list: List of detached free slabs should be freed by caller */ -static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, - int node) +static void free_block(struct kmem_cache *cachep, void **objpp, + int nr_objects, int node, struct list_head *list) { int i; - struct kmem_cache_node *n; + struct kmem_cache_node *n = get_node(cachep, node); for (i = 0; i < nr_objects; i++) { void *objp; @@ -3420,7 +3265,6 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, objp = objpp[i]; page = virt_to_head_page(objp); - n = cachep->node[node]; list_del(&page->lru); check_spinlock_acquired_node(cachep, node); slab_put_obj(cachep, page, objp, node); @@ -3431,13 +3275,7 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, if (page->active == 0) { if (n->free_objects > n->free_limit) { n->free_objects -= cachep->num; - /* No need to drop any previously held - * lock here, even if we have a off-slab slab - * descriptor it is guaranteed to come from - * a different cache, refer to comments before - * alloc_slabmgmt. - */ - slab_destroy(cachep, page); + list_add_tail(&page->lru, list); } else { list_add(&page->lru, &n->slabs_free); } @@ -3456,13 +3294,14 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) int batchcount; struct kmem_cache_node *n; int node = numa_mem_id(); + LIST_HEAD(list); batchcount = ac->batchcount; #if DEBUG BUG_ON(!batchcount || batchcount > ac->avail); #endif check_irq_off(); - n = cachep->node[node]; + n = get_node(cachep, node); spin_lock(&n->list_lock); if (n->shared) { struct array_cache *shared_array = n->shared; @@ -3477,7 +3316,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) } } - free_block(cachep, ac->entry, batchcount, node); + free_block(cachep, ac->entry, batchcount, node, &list); free_done: #if STATS { @@ -3498,6 +3337,7 @@ free_done: } #endif spin_unlock(&n->list_lock); + slabs_destroy(cachep, &list); ac->avail -= batchcount; memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); } @@ -3527,7 +3367,7 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp, if (nr_online_nodes > 1 && cache_free_alien(cachep, objp)) return; - if (likely(ac->avail < ac->limit)) { + if (ac->avail < ac->limit) { STATS_INC_FREEHIT(cachep); } else { STATS_INC_FREEMISS(cachep); @@ -3624,7 +3464,6 @@ __do_kmalloc_node(size_t size, gfp_t flags, int node, unsigned long caller) return kmem_cache_alloc_node_trace(cachep, flags, node, size); } -#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) void *__kmalloc_node(size_t size, gfp_t flags, int node) { return __do_kmalloc_node(size, flags, node, _RET_IP_); @@ -3637,13 +3476,6 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t flags, return __do_kmalloc_node(size, flags, node, caller); } EXPORT_SYMBOL(__kmalloc_node_track_caller); -#else -void *__kmalloc_node(size_t size, gfp_t flags, int node) -{ - return __do_kmalloc_node(size, flags, node, 0); -} -EXPORT_SYMBOL(__kmalloc_node); -#endif /* CONFIG_DEBUG_SLAB || CONFIG_TRACING */ #endif /* CONFIG_NUMA */ /** @@ -3669,8 +3501,6 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, return ret; } - -#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_TRACING) void *__kmalloc(size_t size, gfp_t flags) { return __do_kmalloc(size, flags, _RET_IP_); @@ -3683,14 +3513,6 @@ void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) } EXPORT_SYMBOL(__kmalloc_track_caller); -#else -void *__kmalloc(size_t size, gfp_t flags) -{ - return __do_kmalloc(size, flags, 0); -} -EXPORT_SYMBOL(__kmalloc); -#endif - /** * kmem_cache_free - Deallocate an object * @cachep: The cache the allocation was from. @@ -3754,7 +3576,7 @@ static int alloc_kmem_cache_node(struct kmem_cache *cachep, gfp_t gfp) int node; struct kmem_cache_node *n; struct array_cache *new_shared; - struct array_cache **new_alien = NULL; + struct alien_cache **new_alien = NULL; for_each_online_node(node) { @@ -3775,15 +3597,16 @@ static int alloc_kmem_cache_node(struct kmem_cache *cachep, gfp_t gfp) } } - n = cachep->node[node]; + n = get_node(cachep, node); if (n) { struct array_cache *shared = n->shared; + LIST_HEAD(list); spin_lock_irq(&n->list_lock); if (shared) free_block(cachep, shared->entry, - shared->avail, node); + shared->avail, node, &list); n->shared = new_shared; if (!n->alien) { @@ -3793,6 +3616,7 @@ static int alloc_kmem_cache_node(struct kmem_cache *cachep, gfp_t gfp) n->free_limit = (1 + nr_cpus_node(node)) * cachep->batchcount + cachep->num; spin_unlock_irq(&n->list_lock); + slabs_destroy(cachep, &list); kfree(shared); free_alien_cache(new_alien); continue; @@ -3820,9 +3644,8 @@ fail: /* Cache is not active yet. Roll back what we did */ node--; while (node >= 0) { - if (cachep->node[node]) { - n = cachep->node[node]; - + n = get_node(cachep, node); + if (n) { kfree(n->shared); free_alien_cache(n->alien); kfree(n); @@ -3834,64 +3657,45 @@ fail: return -ENOMEM; } -struct ccupdate_struct { - struct kmem_cache *cachep; - struct array_cache *new[0]; -}; - -static void do_ccupdate_local(void *info) -{ - struct ccupdate_struct *new = info; - struct array_cache *old; - - check_irq_off(); - old = cpu_cache_get(new->cachep); - - new->cachep->array[smp_processor_id()] = new->new[smp_processor_id()]; - new->new[smp_processor_id()] = old; -} - /* Always called with the slab_mutex held */ static int __do_tune_cpucache(struct kmem_cache *cachep, int limit, int batchcount, int shared, gfp_t gfp) { - struct ccupdate_struct *new; - int i; + struct array_cache __percpu *cpu_cache, *prev; + int cpu; - new = kzalloc(sizeof(*new) + nr_cpu_ids * sizeof(struct array_cache *), - gfp); - if (!new) + cpu_cache = alloc_kmem_cache_cpus(cachep, limit, batchcount); + if (!cpu_cache) return -ENOMEM; - for_each_online_cpu(i) { - new->new[i] = alloc_arraycache(cpu_to_mem(i), limit, - batchcount, gfp); - if (!new->new[i]) { - for (i--; i >= 0; i--) - kfree(new->new[i]); - kfree(new); - return -ENOMEM; - } - } - new->cachep = cachep; - - on_each_cpu(do_ccupdate_local, (void *)new, 1); + prev = cachep->cpu_cache; + cachep->cpu_cache = cpu_cache; + kick_all_cpus_sync(); check_irq_on(); cachep->batchcount = batchcount; cachep->limit = limit; cachep->shared = shared; - for_each_online_cpu(i) { - struct array_cache *ccold = new->new[i]; - if (!ccold) - continue; - spin_lock_irq(&cachep->node[cpu_to_mem(i)]->list_lock); - free_block(cachep, ccold->entry, ccold->avail, cpu_to_mem(i)); - spin_unlock_irq(&cachep->node[cpu_to_mem(i)]->list_lock); - kfree(ccold); + if (!prev) + goto alloc_node; + + for_each_online_cpu(cpu) { + LIST_HEAD(list); + int node; + struct kmem_cache_node *n; + struct array_cache *ac = per_cpu_ptr(prev, cpu); + + node = cpu_to_mem(cpu); + n = get_node(cachep, node); + spin_lock_irq(&n->list_lock); + free_block(cachep, ac->entry, ac->avail, node, &list); + spin_unlock_irq(&n->list_lock); + slabs_destroy(cachep, &list); } - kfree(new); + free_percpu(prev); + +alloc_node: return alloc_kmem_cache_node(cachep, gfp); } @@ -3996,6 +3800,7 @@ skip_setup: static void drain_array(struct kmem_cache *cachep, struct kmem_cache_node *n, struct array_cache *ac, int force, int node) { + LIST_HEAD(list); int tofree; if (!ac || !ac->avail) @@ -4008,12 +3813,13 @@ static void drain_array(struct kmem_cache *cachep, struct kmem_cache_node *n, tofree = force ? ac->avail : (ac->limit + 4) / 5; if (tofree > ac->avail) tofree = (ac->avail + 1) / 2; - free_block(cachep, ac->entry, tofree, node); + free_block(cachep, ac->entry, tofree, node, &list); ac->avail -= tofree; memmove(ac->entry, &(ac->entry[tofree]), sizeof(void *) * ac->avail); } spin_unlock_irq(&n->list_lock); + slabs_destroy(cachep, &list); } } @@ -4048,7 +3854,7 @@ static void cache_reap(struct work_struct *w) * have established with reasonable certainty that * we can do some work if the lock was obtained. */ - n = searchp->node[node]; + n = get_node(searchp, node); reap_alien(searchp, n); @@ -4100,10 +3906,7 @@ void get_slabinfo(struct kmem_cache *cachep, struct slabinfo *sinfo) active_objs = 0; num_slabs = 0; - for_each_online_node(node) { - n = cachep->node[node]; - if (!n) - continue; + for_each_kmem_cache_node(cachep, node, n) { check_irq_on(); spin_lock_irq(&n->list_lock); @@ -4328,10 +4131,7 @@ static int leaks_show(struct seq_file *m, void *p) x[1] = 0; - for_each_online_node(node) { - n = cachep->node[node]; - if (!n) - continue; + for_each_kmem_cache_node(cachep, node, n) { check_irq_on(); spin_lock_irq(&n->list_lock); @@ -4378,19 +4178,15 @@ static const struct seq_operations slabstats_op = { static int slabstats_open(struct inode *inode, struct file *file) { - unsigned long *n = kzalloc(PAGE_SIZE, GFP_KERNEL); - int ret = -ENOMEM; - if (n) { - ret = seq_open(file, &slabstats_op); - if (!ret) { - struct seq_file *m = file->private_data; - *n = PAGE_SIZE / (2 * sizeof(unsigned long)); - m->private = n; - n = NULL; - } - kfree(n); - } - return ret; + unsigned long *n; + + n = __seq_open_private(file, &slabstats_op, PAGE_SIZE); + if (!n) + return -ENOMEM; + + *n = PAGE_SIZE / (2 * sizeof(unsigned long)); + + return 0; } static const struct file_operations proc_slabstats_operations = { |