diff options
| -rw-r--r-- | include/linux/slub_def.h | 6 | ||||
| -rw-r--r-- | mm/slub.c | 202 |
2 files changed, 49 insertions, 159 deletions
diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h index 1e14beb..17ebe0f 100644 --- a/include/linux/slub_def.h +++ b/include/linux/slub_def.h @@ -69,6 +69,7 @@ struct kmem_cache_order_objects { * Slab cache management. */ struct kmem_cache { + struct kmem_cache_cpu *cpu_slab; /* Used for retriving partial slabs etc */ unsigned long flags; int size; /* The size of an object including meta data */ @@ -104,11 +105,6 @@ struct kmem_cache { int remote_node_defrag_ratio; struct kmem_cache_node *node[MAX_NUMNODES]; #endif -#ifdef CONFIG_SMP - struct kmem_cache_cpu *cpu_slab[NR_CPUS]; -#else - struct kmem_cache_cpu cpu_slab; -#endif }; /* @@ -242,15 +242,6 @@ static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node) #endif } -static inline struct kmem_cache_cpu *get_cpu_slab(struct kmem_cache *s, int cpu) -{ -#ifdef CONFIG_SMP - return s->cpu_slab[cpu]; -#else - return &s->cpu_slab; -#endif -} - /* Verify that a pointer has an address that is valid within a slab page */ static inline int check_valid_pointer(struct kmem_cache *s, struct page *page, const void *object) @@ -1124,7 +1115,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node) if (!page) return NULL; - stat(get_cpu_slab(s, raw_smp_processor_id()), ORDER_FALLBACK); + stat(this_cpu_ptr(s->cpu_slab), ORDER_FALLBACK); } if (kmemcheck_enabled @@ -1422,7 +1413,7 @@ static struct page *get_partial(struct kmem_cache *s, gfp_t flags, int node) static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail) { struct kmem_cache_node *n = get_node(s, page_to_nid(page)); - struct kmem_cache_cpu *c = get_cpu_slab(s, smp_processor_id()); + struct kmem_cache_cpu *c = this_cpu_ptr(s->cpu_slab); __ClearPageSlubFrozen(page); if (page->inuse) { @@ -1454,7 +1445,7 @@ static void unfreeze_slab(struct kmem_cache *s, struct page *page, int tail) slab_unlock(page); } else { slab_unlock(page); - stat(get_cpu_slab(s, raw_smp_processor_id()), FREE_SLAB); + stat(__this_cpu_ptr(s->cpu_slab), FREE_SLAB); discard_slab(s, page); } } @@ -1507,7 +1498,7 @@ static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) */ static inline void __flush_cpu_slab(struct kmem_cache *s, int cpu) { - struct kmem_cache_cpu *c = get_cpu_slab(s, cpu); + struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); if (likely(c && c->page)) flush_slab(s, c); @@ -1673,7 +1664,7 @@ new_slab: local_irq_disable(); if (new) { - c = get_cpu_slab(s, smp_processor_id()); + c = __this_cpu_ptr(s->cpu_slab); stat(c, ALLOC_SLAB); if (c->page) flush_slab(s, c); @@ -1711,7 +1702,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, void **object; struct kmem_cache_cpu *c; unsigned long flags; - unsigned int objsize; + unsigned long objsize; gfpflags &= gfp_allowed_mask; @@ -1722,14 +1713,14 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, return NULL; local_irq_save(flags); - c = get_cpu_slab(s, smp_processor_id()); + c = __this_cpu_ptr(s->cpu_slab); + object = c->freelist; objsize = c->objsize; - if (unlikely(!c->freelist || !node_match(c, node))) + if (unlikely(!object || !node_match(c, node))) object = __slab_alloc(s, gfpflags, node, addr, c); else { - object = c->freelist; c->freelist = object[c->offset]; stat(c, ALLOC_FASTPATH); } @@ -1800,7 +1791,7 @@ static void __slab_free(struct kmem_cache *s, struct page *page, void **object = (void *)x; struct kmem_cache_cpu *c; - c = get_cpu_slab(s, raw_smp_processor_id()); + c = __this_cpu_ptr(s->cpu_slab); stat(c, FREE_SLOWPATH); slab_lock(page); @@ -1872,7 +1863,7 @@ static __always_inline void slab_free(struct kmem_cache *s, kmemleak_free_recursive(x, s->flags); local_irq_save(flags); - c = get_cpu_slab(s, smp_processor_id()); + c = __this_cpu_ptr(s->cpu_slab); kmemcheck_slab_free(s, object, c->objsize); debug_check_no_locks_freed(object, c->objsize); if (!(s->flags & SLAB_DEBUG_OBJECTS)) @@ -2095,130 +2086,28 @@ init_kmem_cache_node(struct kmem_cache_node *n, struct kmem_cache *s) #endif } -#ifdef CONFIG_SMP -/* - * Per cpu array for per cpu structures. - * - * The per cpu array places all kmem_cache_cpu structures from one processor - * close together meaning that it becomes possible that multiple per cpu - * structures are contained in one cacheline. This may be particularly - * beneficial for the kmalloc caches. - * - * A desktop system typically has around 60-80 slabs. With 100 here we are - * likely able to get per cpu structures for all caches from the array defined - * here. We must be able to cover all kmalloc caches during bootstrap. - * - * If the per cpu array is exhausted then fall back to kmalloc - * of individual cachelines. No sharing is possible then. - */ -#define NR_KMEM_CACHE_CPU 100 - -static DEFINE_PER_CPU(struct kmem_cache_cpu [NR_KMEM_CACHE_CPU], - kmem_cache_cpu); - -static DEFINE_PER_CPU(struct kmem_cache_cpu *, kmem_cache_cpu_free); -static DECLARE_BITMAP(kmem_cach_cpu_free_init_once, CONFIG_NR_CPUS); - -static struct kmem_cache_cpu *alloc_kmem_cache_cpu(struct kmem_cache *s, - int cpu, gfp_t flags) -{ - struct kmem_cache_cpu *c = per_cpu(kmem_cache_cpu_free, cpu); - - if (c) - per_cpu(kmem_cache_cpu_free, cpu) = - (void *)c->freelist; - else { - /* Table overflow: So allocate ourselves */ - c = kmalloc_node( - ALIGN(sizeof(struct kmem_cache_cpu), cache_line_size()), - flags, cpu_to_node(cpu)); - if (!c) - return NULL; - } - - init_kmem_cache_cpu(s, c); - return c; -} - -static void free_kmem_cache_cpu(struct kmem_cache_cpu *c, int cpu) -{ - if (c < per_cpu(kmem_cache_cpu, cpu) || - c >= per_cpu(kmem_cache_cpu, cpu) + NR_KMEM_CACHE_CPU) { - kfree(c); - return; - } - c->freelist = (void *)per_cpu(kmem_cache_cpu_free, cpu); - per_cpu(kmem_cache_cpu_free, cpu) = c; -} - -static void free_kmem_cache_cpus(struct kmem_cache *s) -{ - int cpu; - - for_each_online_cpu(cpu) { - struct kmem_cache_cpu *c = get_cpu_slab(s, cpu); - - if (c) { - s->cpu_slab[cpu] = NULL; - free_kmem_cache_cpu(c, cpu); - } - } -} - -static int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) -{ - int cpu; - - for_each_online_cpu(cpu) { - struct kmem_cache_cpu *c = get_cpu_slab(s, cpu); +static DEFINE_PER_CPU(struct kmem_cache_cpu, kmalloc_percpu[SLUB_PAGE_SHIFT]); - if (c) - continue; - - c = alloc_kmem_cache_cpu(s, cpu, flags); - if (!c) { - free_kmem_cache_cpus(s); - return 0; - } - s->cpu_slab[cpu] = c; - } - return 1; -} - -/* - * Initialize the per cpu array. - */ -static void init_alloc_cpu_cpu(int cpu) -{ - int i; - - if (cpumask_test_cpu(cpu, to_cpumask(kmem_cach_cpu_free_init_once))) - return; - - for (i = NR_KMEM_CACHE_CPU - 1; i >= 0; i--) - free_kmem_cache_cpu(&per_cpu(kmem_cache_cpu, cpu)[i], cpu); - - cpumask_set_cpu(cpu, to_cpumask(kmem_cach_cpu_free_init_once)); -} - -static void __init init_alloc_cpu(void) +static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) { int cpu; - for_each_online_cpu(cpu) - init_alloc_cpu_cpu(cpu); - } + if (s < kmalloc_caches + SLUB_PAGE_SHIFT && s >= kmalloc_caches) + /* + * Boot time creation of the kmalloc array. Use static per cpu data + * since the per cpu allocator is not available yet. + */ + s->cpu_slab = per_cpu_var(kmalloc_percpu) + (s - kmalloc_caches); + else + s->cpu_slab = alloc_percpu(struct kmem_cache_cpu); -#else -static inline void free_kmem_cache_cpus(struct kmem_cache *s) {} -static inline void init_alloc_cpu(void) {} + if (!s->cpu_slab) + return 0; -static inline int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags) -{ - init_kmem_cache_cpu(s, &s->cpu_slab); + for_each_possible_cpu(cpu) + init_kmem_cache_cpu(s, per_cpu_ptr(s->cpu_slab, cpu)); return 1; } -#endif #ifdef CONFIG_NUMA /* @@ -2609,9 +2498,8 @@ 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 */ - free_kmem_cache_cpus(s); for_each_node_state(node, N_NORMAL_MEMORY) { struct kmem_cache_node *n = get_node(s, node); @@ -2760,7 +2648,19 @@ static noinline struct kmem_cache *dma_kmalloc_cache(int index, gfp_t flags) realsize = kmalloc_caches[index].objsize; text = kasprintf(flags & ~SLUB_DMA, "kmalloc_dma-%d", (unsigned int)realsize); - s = kmalloc(kmem_size, flags & ~SLUB_DMA); + + if (flags & __GFP_WAIT) + s = kmalloc(kmem_size, flags & ~SLUB_DMA); + else { + int i; + + s = NULL; + for (i = 0; i < SLUB_PAGE_SHIFT; i++) + if (kmalloc_caches[i].size) { + s = kmalloc_caches + i; + break; + } + } /* * Must defer sysfs creation to a workqueue because we don't know @@ -3176,8 +3076,6 @@ void __init kmem_cache_init(void) int i; int caches = 0; - init_alloc_cpu(); - #ifdef CONFIG_NUMA /* * Must first have the slab cache available for the allocations of the @@ -3261,8 +3159,10 @@ void __init kmem_cache_init(void) #ifdef CONFIG_SMP register_cpu_notifier(&slab_notifier); - kmem_size = offsetof(struct kmem_cache, cpu_slab) + - nr_cpu_ids * sizeof(struct kmem_cache_cpu *); +#endif +#ifdef CONFIG_NUMA + kmem_size = offsetof(struct kmem_cache, node) + + nr_node_ids * sizeof(struct kmem_cache_node *); #else kmem_size = sizeof(struct kmem_cache); #endif @@ -3365,7 +3265,7 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, * per cpu structures */ for_each_online_cpu(cpu) - get_cpu_slab(s, cpu)->objsize = s->objsize; + per_cpu_ptr(s->cpu_slab, cpu)->objsize = s->objsize; s->inuse = max_t(int, s->inuse, ALIGN(size, sizeof(void *))); up_write(&slub_lock); @@ -3422,11 +3322,9 @@ static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, switch (action) { case CPU_UP_PREPARE: case CPU_UP_PREPARE_FROZEN: - init_alloc_cpu_cpu(cpu); down_read(&slub_lock); list_for_each_entry(s, &slab_caches, list) - s->cpu_slab[cpu] = alloc_kmem_cache_cpu(s, cpu, - GFP_KERNEL); + init_kmem_cache_cpu(s, per_cpu_ptr(s->cpu_slab, cpu)); up_read(&slub_lock); break; @@ -3436,13 +3334,9 @@ static int __cpuinit slab_cpuup_callback(struct notifier_block *nfb, case CPU_DEAD_FROZEN: down_read(&slub_lock); list_for_each_entry(s, &slab_caches, list) { - struct kmem_cache_cpu *c = get_cpu_slab(s, cpu); - local_irq_save(flags); __flush_cpu_slab(s, cpu); local_irq_restore(flags); - free_kmem_cache_cpu(c, cpu); - s->cpu_slab[cpu] = NULL; } up_read(&slub_lock); break; @@ -3928,7 +3822,7 @@ static ssize_t show_slab_objects(struct kmem_cache *s, int cpu; for_each_possible_cpu(cpu) { - struct kmem_cache_cpu *c = get_cpu_slab(s, cpu); + struct kmem_cache_cpu *c = per_cpu_ptr(s->cpu_slab, cpu); if (!c || c->node < 0) continue; @@ -4353,7 +4247,7 @@ static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) return -ENOMEM; for_each_online_cpu(cpu) { - unsigned x = get_cpu_slab(s, cpu)->stat[si]; + unsigned x = per_cpu_ptr(s->cpu_slab, cpu)->stat[si]; data[cpu] = x; sum += x; @@ -4376,7 +4270,7 @@ static void clear_stat(struct kmem_cache *s, enum stat_item si) int cpu; for_each_online_cpu(cpu) - get_cpu_slab(s, cpu)->stat[si] = 0; + per_cpu_ptr(s->cpu_slab, cpu)->stat[si] = 0; } #define STAT_ATTR(si, text) \ |
