diff options
Diffstat (limited to 'mm/slub.c')
| -rw-r--r-- | mm/slub.c | 127 |
1 files changed, 119 insertions, 8 deletions
diff --git a/mm/slub.c b/mm/slub.c index 20ab8f0a4eb9..ac836d31e3be 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -250,6 +250,7 @@ enum track_item { TRACK_ALLOC, TRACK_FREE }; static int sysfs_slab_add(struct kmem_cache *); static int sysfs_slab_alias(struct kmem_cache *, const char *); static void sysfs_slab_remove(struct kmem_cache *); + #else static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) @@ -258,8 +259,16 @@ static inline void sysfs_slab_remove(struct kmem_cache *s) { kfree(s); } + #endif +static inline void stat(struct kmem_cache_cpu *c, enum stat_item si) +{ +#ifdef CONFIG_SLUB_STATS + c->stat[si]++; +#endif +} + /******************************************************************** * Core slab cache functions *******************************************************************/ @@ -1364,17 +1373,22 @@ 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()); ClearSlabFrozen(page); if (page->inuse) { - if (page->freelist != page->end) + if (page->freelist != page->end) { add_partial(n, page, tail); - else if (SlabDebug(page) && (s->flags & SLAB_STORE_USER)) - add_full(n, page); + stat(c, tail ? DEACTIVATE_TO_TAIL : DEACTIVATE_TO_HEAD); + } else { + stat(c, DEACTIVATE_FULL); + if (SlabDebug(page) && (s->flags & SLAB_STORE_USER)) + add_full(n, page); + } slab_unlock(page); - } else { + stat(c, DEACTIVATE_EMPTY); if (n->nr_partial < MIN_PARTIAL) { /* * Adding an empty slab to the partial slabs in order @@ -1388,6 +1402,7 @@ 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); discard_slab(s, page); } } @@ -1400,6 +1415,9 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) { struct page *page = c->page; int tail = 1; + + if (c->freelist) + stat(c, DEACTIVATE_REMOTE_FREES); /* * Merge cpu freelist into freelist. Typically we get here * because both freelists are empty. So this is unlikely @@ -1429,6 +1447,7 @@ static void deactivate_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) static inline void flush_slab(struct kmem_cache *s, struct kmem_cache_cpu *c) { + stat(c, CPUSLAB_FLUSH); slab_lock(c->page); deactivate_slab(s, c); } @@ -1511,6 +1530,7 @@ static void *__slab_alloc(struct kmem_cache *s, slab_lock(c->page); if (unlikely(!node_match(c, node))) goto another_slab; + stat(c, ALLOC_REFILL); load_freelist: object = c->page->freelist; if (unlikely(object == c->page->end)) @@ -1525,6 +1545,7 @@ load_freelist: c->node = page_to_nid(c->page); unlock_out: slab_unlock(c->page); + stat(c, ALLOC_SLOWPATH); out: #ifdef SLUB_FASTPATH local_irq_restore(flags); @@ -1538,6 +1559,7 @@ new_slab: new = get_partial(s, gfpflags, node); if (new) { c->page = new; + stat(c, ALLOC_FROM_PARTIAL); goto load_freelist; } @@ -1551,6 +1573,7 @@ new_slab: if (new) { c = get_cpu_slab(s, smp_processor_id()); + stat(c, ALLOC_SLAB); if (c->page) flush_slab(s, c); slab_lock(new); @@ -1610,6 +1633,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, object = __slab_alloc(s, gfpflags, node, addr, c); break; } + stat(c, ALLOC_FASTPATH); } while (cmpxchg_local(&c->freelist, object, object[c->offset]) != object); #else @@ -1624,6 +1648,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, else { object = c->freelist; c->freelist = object[c->offset]; + stat(c, ALLOC_FASTPATH); } local_irq_restore(flags); #endif @@ -1661,12 +1686,15 @@ static void __slab_free(struct kmem_cache *s, struct page *page, { void *prior; void **object = (void *)x; + struct kmem_cache_cpu *c; #ifdef SLUB_FASTPATH unsigned long flags; local_irq_save(flags); #endif + c = get_cpu_slab(s, raw_smp_processor_id()); + stat(c, FREE_SLOWPATH); slab_lock(page); if (unlikely(SlabDebug(page))) @@ -1676,8 +1704,10 @@ checks_ok: page->freelist = object; page->inuse--; - if (unlikely(SlabFrozen(page))) + if (unlikely(SlabFrozen(page))) { + stat(c, FREE_FROZEN); goto out_unlock; + } if (unlikely(!page->inuse)) goto slab_empty; @@ -1687,8 +1717,10 @@ checks_ok: * was not on the partial list before * then add it. */ - if (unlikely(prior == page->end)) + if (unlikely(prior == page->end)) { add_partial(get_node(s, page_to_nid(page)), page, 1); + stat(c, FREE_ADD_PARTIAL); + } out_unlock: slab_unlock(page); @@ -1698,13 +1730,15 @@ out_unlock: return; slab_empty: - if (prior != page->end) + if (prior != page->end) { /* * Slab still on the partial list. */ remove_partial(s, page); - + stat(c, FREE_REMOVE_PARTIAL); + } slab_unlock(page); + stat(c, FREE_SLAB); #ifdef SLUB_FASTPATH local_irq_restore(flags); #endif @@ -1758,6 +1792,7 @@ static __always_inline void slab_free(struct kmem_cache *s, break; } object[c->offset] = freelist; + stat(c, FREE_FASTPATH); } while (cmpxchg_local(&c->freelist, freelist, object) != freelist); #else unsigned long flags; @@ -1768,6 +1803,7 @@ static __always_inline void slab_free(struct kmem_cache *s, if (likely(page == c->page && c->node >= 0)) { object[c->offset] = c->freelist; c->freelist = object; + stat(c, FREE_FASTPATH); } else __slab_free(s, page, x, addr, c->offset); @@ -3980,6 +4016,62 @@ static ssize_t remote_node_defrag_ratio_store(struct kmem_cache *s, SLAB_ATTR(remote_node_defrag_ratio); #endif +#ifdef CONFIG_SLUB_STATS + +static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) +{ + unsigned long sum = 0; + int cpu; + int len; + int *data = kmalloc(nr_cpu_ids * sizeof(int), GFP_KERNEL); + + if (!data) + return -ENOMEM; + + for_each_online_cpu(cpu) { + unsigned x = get_cpu_slab(s, cpu)->stat[si]; + + data[cpu] = x; + sum += x; + } + + len = sprintf(buf, "%lu", sum); + + for_each_online_cpu(cpu) { + if (data[cpu] && len < PAGE_SIZE - 20) + len += sprintf(buf + len, " c%d=%u", cpu, data[cpu]); + } + kfree(data); + return len + sprintf(buf + len, "\n"); +} + +#define STAT_ATTR(si, text) \ +static ssize_t text##_show(struct kmem_cache *s, char *buf) \ +{ \ + return show_stat(s, buf, si); \ +} \ +SLAB_ATTR_RO(text); \ + +STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); +STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); +STAT_ATTR(FREE_FASTPATH, free_fastpath); +STAT_ATTR(FREE_SLOWPATH, free_slowpath); +STAT_ATTR(FREE_FROZEN, free_frozen); +STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); +STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); +STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); +STAT_ATTR(ALLOC_SLAB, alloc_slab); +STAT_ATTR(ALLOC_REFILL, alloc_refill); +STAT_ATTR(FREE_SLAB, free_slab); +STAT_ATTR(CPUSLAB_FLUSH, cpuslab_flush); +STAT_ATTR(DEACTIVATE_FULL, deactivate_full); +STAT_ATTR(DEACTIVATE_EMPTY, deactivate_empty); +STAT_ATTR(DEACTIVATE_TO_HEAD, deactivate_to_head); +STAT_ATTR(DEACTIVATE_TO_TAIL, deactivate_to_tail); +STAT_ATTR(DEACTIVATE_REMOTE_FREES, deactivate_remote_frees); + +#endif + static struct attribute *slab_attrs[] = { &slab_size_attr.attr, &object_size_attr.attr, @@ -4010,6 +4102,25 @@ static struct attribute *slab_attrs[] = { #ifdef CONFIG_NUMA &remote_node_defrag_ratio_attr.attr, #endif +#ifdef CONFIG_SLUB_STATS + &alloc_fastpath_attr.attr, + &alloc_slowpath_attr.attr, + &free_fastpath_attr.attr, + &free_slowpath_attr.attr, + &free_frozen_attr.attr, + &free_add_partial_attr.attr, + &free_remove_partial_attr.attr, + &alloc_from_partial_attr.attr, + &alloc_slab_attr.attr, + &alloc_refill_attr.attr, + &free_slab_attr.attr, + &cpuslab_flush_attr.attr, + &deactivate_full_attr.attr, + &deactivate_empty_attr.attr, + &deactivate_to_head_attr.attr, + &deactivate_to_tail_attr.attr, + &deactivate_remote_frees_attr.attr, +#endif NULL }; 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