diff options
| -rw-r--r-- | include/linux/slub_def.h | 2 | ||||
| -rw-r--r-- | init/Kconfig | 2 | ||||
| -rw-r--r-- | lib/Kconfig.debug | 2 | ||||
| -rw-r--r-- | mm/slub.c | 97 |
4 files changed, 67 insertions, 36 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index b00c1c73eb0..79d59c937fa 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 a97924bc5b8..7fccf09bb95 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 diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 0796c1a090c..eef557dc46c 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -211,7 +211,7 @@ config SLUB_DEBUG_ON config SLUB_STATS default n bool "Enable SLUB performance statistics" - depends on SLUB + depends on SLUB && SLUB_DEBUG && SYSFS help SLUB statistics are useful to debug SLUBs allocation behavior in order find ways to optimize the allocator. This should never be diff --git a/mm/slub.c b/mm/slub.c index acc975fcc8c..7f8aaa291a4 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -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 | @@ -1125,6 +1156,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page) NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, -pages); + __ClearPageSlab(page); + reset_page_mapcount(page); __free_pages(page, s->order); } @@ -1151,11 +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); - reset_page_mapcount(page); - __ClearPageSlab(page); + dec_slabs_node(s, page_to_nid(page)); free_slab(s, page); } @@ -1886,15 +1915,18 @@ static void init_kmem_cache_cpu(struct kmem_cache *s, c->node = 0; c->offset = s->offset / sizeof(void *); c->objsize = s->objsize; +#ifdef CONFIG_SLUB_STATS + memset(c->stat, 0, NR_SLUB_STAT_ITEMS * sizeof(unsigned)); +#endif } 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 } @@ -2063,7 +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 @@ -2376,7 +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); @@ -2409,10 +2441,6 @@ EXPORT_SYMBOL(kmem_cache_destroy); struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1] __cacheline_aligned; EXPORT_SYMBOL(kmalloc_caches); -#ifdef CONFIG_ZONE_DMA -static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1]; -#endif - static int __init setup_slub_min_order(char *str) { get_option(&str, &slub_min_order); @@ -2472,6 +2500,7 @@ panic: } #ifdef CONFIG_ZONE_DMA +static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1]; static void sysfs_add_func(struct work_struct *w) { @@ -2688,21 +2717,6 @@ void kfree(const void *x) } EXPORT_SYMBOL(kfree); -#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SLABINFO) -static unsigned long count_partial(struct kmem_cache_node *n) -{ - unsigned long flags; - unsigned long x = 0; - struct page *page; - - spin_lock_irqsave(&n->list_lock, flags); - list_for_each_entry(page, &n->partial, lru) - x += page->inuse; - spin_unlock_irqrestore(&n->list_lock, flags); - return x; -} -#endif - /* * kmem_cache_shrink removes empty slabs from the partial lists and sorts * the remaining slabs by the number of items in use. The slabs with the @@ -2816,7 +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); @@ -3181,6 +3195,21 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, return slab_alloc(s, gfpflags, node, caller); } +#if (defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)) || defined(CONFIG_SLABINFO) +static unsigned long count_partial(struct kmem_cache_node *n) +{ + unsigned long flags; + unsigned long x = 0; + struct page *page; + + spin_lock_irqsave(&n->list_lock, flags); + list_for_each_entry(page, &n->partial, lru) + x += page->inuse; + spin_unlock_irqrestore(&n->list_lock, flags); + return x; +} +#endif + #if defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG) static int validate_slab(struct kmem_cache *s, struct page *page, unsigned long *map) @@ -3979,10 +4008,12 @@ static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) len = sprintf(buf, "%lu", sum); +#ifdef CONFIG_SMP for_each_online_cpu(cpu) { if (data[cpu] && len < PAGE_SIZE - 20) - len += sprintf(buf + len, " c%d=%u", cpu, data[cpu]); + len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); } +#endif kfree(data); return len + sprintf(buf + len, "\n"); } |