diff options
| -rw-r--r-- | include/linux/slub_def.h | 2 | ||||
| -rw-r--r-- | init/Kconfig | 2 | ||||
| -rw-r--r-- | mm/slub.c | 51 |
3 files changed, 42 insertions, 13 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index b00c1c7..79d59c9 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -45,9 +45,9 @@ struct kmem_cache_cpu { struct kmem_cache_node { spinlock_t list_lock; /* Protect partial list and nr_partial */ unsigned long nr_partial; - atomic_long_t nr_slabs; struct list_head partial; #ifdef CONFIG_SLUB_DEBUG + atomic_long_t nr_slabs; struct list_head full; #endif }; diff --git a/init/Kconfig b/init/Kconfig index a97924b..7fccf09 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -763,7 +763,7 @@ endmenu # General setup config SLABINFO bool depends on PROC_FS - depends on SLAB || SLUB + depends on SLAB || SLUB_DEBUG default y config RT_MUTEXES @@ -837,6 +837,35 @@ static void remove_full(struct kmem_cache *s, struct page *page) spin_unlock(&n->list_lock); } +/* Tracking of the number of slabs for debugging purposes */ +static inline unsigned long slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + return atomic_long_read(&n->nr_slabs); +} + +static inline void inc_slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + /* + * May be called early in order to allocate a slab for the + * kmem_cache_node structure. Solve the chicken-egg + * dilemma by deferring the increment of the count during + * bootstrap (see early_kmem_cache_node_alloc). + */ + if (!NUMA_BUILD || n) + atomic_long_inc(&n->nr_slabs); +} +static inline void dec_slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + atomic_long_dec(&n->nr_slabs); +} + +/* Object debug checks for alloc/free paths */ static void setup_object_debug(struct kmem_cache *s, struct page *page, void *object) { @@ -1028,6 +1057,11 @@ static inline unsigned long kmem_cache_flags(unsigned long objsize, return flags; } #define slub_debug 0 + +static inline unsigned long slabs_node(struct kmem_cache *s, int node) + { return 0; } +static inline void inc_slabs_node(struct kmem_cache *s, int node) {} +static inline void dec_slabs_node(struct kmem_cache *s, int node) {} #endif /* * Slab allocation and freeing @@ -1066,7 +1100,6 @@ static void setup_object(struct kmem_cache *s, struct page *page, static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) { struct page *page; - struct kmem_cache_node *n; void *start; void *last; void *p; @@ -1078,9 +1111,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) if (!page) goto out; - n = get_node(s, page_to_nid(page)); - if (n) - atomic_long_inc(&n->nr_slabs); + inc_slabs_node(s, page_to_nid(page)); page->slab = s; page->flags |= 1 << PG_slab; if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON | @@ -1153,9 +1184,7 @@ static void free_slab(struct kmem_cache *s, struct page *page) static void discard_slab(struct kmem_cache *s, struct page *page) { - struct kmem_cache_node *n = get_node(s, page_to_nid(page)); - - atomic_long_dec(&n->nr_slabs); + dec_slabs_node(s, page_to_nid(page)); free_slab(s, page); } @@ -1894,10 +1923,10 @@ static void init_kmem_cache_cpu(struct kmem_cache *s, static void init_kmem_cache_node(struct kmem_cache_node *n) { n->nr_partial = 0; - atomic_long_set(&n->nr_slabs, 0); spin_lock_init(&n->list_lock); INIT_LIST_HEAD(&n->partial); #ifdef CONFIG_SLUB_DEBUG + atomic_long_set(&n->nr_slabs, 0); INIT_LIST_HEAD(&n->full); #endif } @@ -2066,7 +2095,7 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, init_tracking(kmalloc_caches, n); #endif init_kmem_cache_node(n); - atomic_long_inc(&n->nr_slabs); + inc_slabs_node(kmalloc_caches, node); /* * lockdep requires consistent irq usage for each lock @@ -2379,7 +2408,7 @@ static inline int kmem_cache_close(struct kmem_cache *s) struct kmem_cache_node *n = get_node(s, node); n->nr_partial -= free_list(s, n, &n->partial); - if (atomic_long_read(&n->nr_slabs)) + if (slabs_node(s, node)) return 1; } free_kmem_cache_nodes(s); @@ -2801,7 +2830,7 @@ static void slab_mem_offline_callback(void *arg) * and offline_pages() function shoudn't call this * callback. So, we must fail. */ - BUG_ON(atomic_long_read(&n->nr_slabs)); + BUG_ON(slabs_node(s, offline_node)); s->node[offline_node] = NULL; kmem_cache_free(kmalloc_caches, n); |