X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=mm%2Fslab.c;h=31ea409b8e6dc66e8ffd4e7278eacf710b04f7dc;hb=97bf2856c6014879bd04983a3e9dfcdac1e7fe85;hp=d0bd7f07ab041d3d7da06c5cec610035c3058b33;hpb=76828883507a47dae78837ab5dec5a5b4513c667;p=linux-2.6.git diff --git a/mm/slab.c b/mm/slab.c index d0bd7f07a..31ea409b8 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -50,7 +50,7 @@ * The head array is strictly LIFO and should improve the cache hit rates. * On SMP, it additionally reduces the spinlock operations. * - * The c_cpuarray may not be read with enabled local interrupts - + * The c_cpuarray may not be read with enabled local interrupts - * it's changed with a smp_call_function(). * * SMP synchronization: @@ -86,14 +86,15 @@ * All object allocations for a node occur from node specific slab lists. */ -#include #include #include +#include #include #include #include #include #include +#include #include #include #include @@ -102,11 +103,14 @@ #include #include #include +#include #include #include #include +#include +#include +#include -#include #include #include #include @@ -170,15 +174,15 @@ #if DEBUG # define CREATE_MASK (SLAB_DEBUG_INITIAL | SLAB_RED_ZONE | \ SLAB_POISON | SLAB_HWCACHE_ALIGN | \ - SLAB_NO_REAP | SLAB_CACHE_DMA | \ + SLAB_CACHE_DMA | \ SLAB_MUST_HWCACHE_ALIGN | SLAB_STORE_USER | \ SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ - SLAB_DESTROY_BY_RCU) + SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) #else -# define CREATE_MASK (SLAB_HWCACHE_ALIGN | SLAB_NO_REAP | \ +# define CREATE_MASK (SLAB_HWCACHE_ALIGN | \ SLAB_CACHE_DMA | SLAB_MUST_HWCACHE_ALIGN | \ SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \ - SLAB_DESTROY_BY_RCU) + SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD) #endif /* @@ -203,12 +207,8 @@ typedef unsigned int kmem_bufctl_t; #define BUFCTL_END (((kmem_bufctl_t)(~0U))-0) #define BUFCTL_FREE (((kmem_bufctl_t)(~0U))-1) -#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-2) - -/* Max number of objs-per-slab for caches which use off-slab slabs. - * Needed to avoid a possible looping condition in cache_grow(). - */ -static unsigned long offslab_limit; +#define BUFCTL_ACTIVE (((kmem_bufctl_t)(~0U))-2) +#define SLAB_LIMIT (((kmem_bufctl_t)(~0U))-3) /* * struct slab @@ -266,16 +266,17 @@ struct array_cache { unsigned int batchcount; unsigned int touched; spinlock_t lock; - void *entry[0]; /* - * Must have this definition in here for the proper - * alignment of array_cache. Also simplifies accessing - * the entries. - * [0] is for gcc 2.95. It should really be []. - */ + void *entry[0]; /* + * Must have this definition in here for the proper + * alignment of array_cache. Also simplifies accessing + * the entries. + * [0] is for gcc 2.95. It should really be []. + */ }; -/* bootstrap: The caches do not work without cpuarrays anymore, - * but the cpuarrays are allocated from the generic caches... +/* + * bootstrap: The caches do not work without cpuarrays anymore, but the + * cpuarrays are allocated from the generic caches... */ #define BOOT_CPUCACHE_ENTRIES 1 struct arraycache_init { @@ -291,13 +292,13 @@ struct kmem_list3 { struct list_head slabs_full; struct list_head slabs_free; unsigned long free_objects; - unsigned long next_reap; - int free_touched; unsigned int free_limit; unsigned int colour_next; /* Per-node cache coloring */ spinlock_t list_lock; struct array_cache *shared; /* shared per node */ struct array_cache **alien; /* on other nodes */ + unsigned long next_reap; /* updated without locking */ + int free_touched; /* updated without locking */ }; /* @@ -309,11 +310,16 @@ struct kmem_list3 __initdata initkmem_list3[NUM_INIT_LISTS]; #define SIZE_AC 1 #define SIZE_L3 (1 + MAX_NUMNODES) +static int drain_freelist(struct kmem_cache *cache, + struct kmem_list3 *l3, int tofree); +static void free_block(struct kmem_cache *cachep, void **objpp, int len, + int node); +static int enable_cpucache(struct kmem_cache *cachep); +static void cache_reap(struct work_struct *unused); + /* - * This function must be completely optimized away if - * a constant is passed to it. Mostly the same as - * what is in linux/slab.h except it returns an - * index. + * This function must be completely optimized away if a constant is passed to + * it. Mostly the same as what is in linux/slab.h except it returns an index. */ static __always_inline int index_of(const size_t size) { @@ -335,6 +341,8 @@ static __always_inline int index_of(const size_t size) return 0; } +static int slab_early_init = 1; + #define INDEX_AC index_of(sizeof(struct arraycache_init)) #define INDEX_L3 index_of(sizeof(struct kmem_list3)) @@ -351,14 +359,14 @@ static void kmem_list3_init(struct kmem_list3 *parent) parent->free_touched = 0; } -#define MAKE_LIST(cachep, listp, slab, nodeid) \ - do { \ - INIT_LIST_HEAD(listp); \ - list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ +#define MAKE_LIST(cachep, listp, slab, nodeid) \ + do { \ + INIT_LIST_HEAD(listp); \ + list_splice(&(cachep->nodelists[nodeid]->slab), listp); \ } while (0) -#define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ - do { \ +#define MAKE_ALL_LISTS(cachep, ptr, nodeid) \ + do { \ MAKE_LIST((cachep), (&(ptr)->slabs_full), slabs_full, nodeid); \ MAKE_LIST((cachep), (&(ptr)->slabs_partial), slabs_partial, nodeid); \ MAKE_LIST((cachep), (&(ptr)->slabs_free), slabs_free, nodeid); \ @@ -373,28 +381,31 @@ static void kmem_list3_init(struct kmem_list3 *parent) struct kmem_cache { /* 1) per-cpu data, touched during every alloc/free */ struct array_cache *array[NR_CPUS]; +/* 2) Cache tunables. Protected by cache_chain_mutex */ unsigned int batchcount; unsigned int limit; unsigned int shared; + unsigned int buffer_size; -/* 2) touched by every alloc & free from the backend */ + u32 reciprocal_buffer_size; +/* 3) touched by every alloc & free from the backend */ struct kmem_list3 *nodelists[MAX_NUMNODES]; - unsigned int flags; /* constant flags */ - unsigned int num; /* # of objs per slab */ - spinlock_t spinlock; -/* 3) cache_grow/shrink */ + unsigned int flags; /* constant flags */ + unsigned int num; /* # of objs per slab */ + +/* 4) cache_grow/shrink */ /* order of pgs per slab (2^n) */ unsigned int gfporder; /* force GFP flags, e.g. GFP_DMA */ gfp_t gfpflags; - size_t colour; /* cache colouring range */ + size_t colour; /* cache colouring range */ unsigned int colour_off; /* colour offset */ struct kmem_cache *slabp_cache; unsigned int slab_size; - unsigned int dflags; /* dynamic flags */ + unsigned int dflags; /* dynamic flags */ /* constructor func */ void (*ctor) (void *, struct kmem_cache *, unsigned long); @@ -402,11 +413,11 @@ struct kmem_cache { /* de-constructor func */ void (*dtor) (void *, struct kmem_cache *, unsigned long); -/* 4) cache creation/removal */ +/* 5) cache creation/removal */ const char *name; struct list_head next; -/* 5) statistics */ +/* 6) statistics */ #if STATS unsigned long num_active; unsigned long num_allocations; @@ -417,6 +428,7 @@ struct kmem_cache { unsigned long max_freeable; unsigned long node_allocs; unsigned long node_frees; + unsigned long node_overflow; atomic_t allochit; atomic_t allocmiss; atomic_t freehit; @@ -438,8 +450,9 @@ struct kmem_cache { #define OFF_SLAB(x) ((x)->flags & CFLGS_OFF_SLAB) #define BATCHREFILL_LIMIT 16 -/* Optimization question: fewer reaps means less - * probability for unnessary cpucache drain/refill cycles. +/* + * Optimization question: fewer reaps means less probability for unnessary + * cpucache drain/refill cycles. * * OTOH the cpuarrays can contain lots of objects, * which could lock up otherwise freeable slabs. @@ -452,18 +465,21 @@ struct kmem_cache { #define STATS_DEC_ACTIVE(x) ((x)->num_active--) #define STATS_INC_ALLOCED(x) ((x)->num_allocations++) #define STATS_INC_GROWN(x) ((x)->grown++) -#define STATS_INC_REAPED(x) ((x)->reaped++) -#define STATS_SET_HIGH(x) do { if ((x)->num_active > (x)->high_mark) \ - (x)->high_mark = (x)->num_active; \ - } while (0) +#define STATS_ADD_REAPED(x,y) ((x)->reaped += (y)) +#define STATS_SET_HIGH(x) \ + do { \ + if ((x)->num_active > (x)->high_mark) \ + (x)->high_mark = (x)->num_active; \ + } while (0) #define STATS_INC_ERR(x) ((x)->errors++) #define STATS_INC_NODEALLOCS(x) ((x)->node_allocs++) #define STATS_INC_NODEFREES(x) ((x)->node_frees++) -#define STATS_SET_FREEABLE(x, i) \ - do { if ((x)->max_freeable < i) \ - (x)->max_freeable = i; \ - } while (0) - +#define STATS_INC_ACOVERFLOW(x) ((x)->node_overflow++) +#define STATS_SET_FREEABLE(x, i) \ + do { \ + if ((x)->max_freeable < i) \ + (x)->max_freeable = i; \ + } while (0) #define STATS_INC_ALLOCHIT(x) atomic_inc(&(x)->allochit) #define STATS_INC_ALLOCMISS(x) atomic_inc(&(x)->allocmiss) #define STATS_INC_FREEHIT(x) atomic_inc(&(x)->freehit) @@ -473,33 +489,25 @@ struct kmem_cache { #define STATS_DEC_ACTIVE(x) do { } while (0) #define STATS_INC_ALLOCED(x) do { } while (0) #define STATS_INC_GROWN(x) do { } while (0) -#define STATS_INC_REAPED(x) do { } while (0) +#define STATS_ADD_REAPED(x,y) do { } while (0) #define STATS_SET_HIGH(x) do { } while (0) #define STATS_INC_ERR(x) do { } while (0) #define STATS_INC_NODEALLOCS(x) do { } while (0) #define STATS_INC_NODEFREES(x) do { } while (0) -#define STATS_SET_FREEABLE(x, i) \ - do { } while (0) - +#define STATS_INC_ACOVERFLOW(x) do { } while (0) +#define STATS_SET_FREEABLE(x, i) do { } while (0) #define STATS_INC_ALLOCHIT(x) do { } while (0) #define STATS_INC_ALLOCMISS(x) do { } while (0) #define STATS_INC_FREEHIT(x) do { } while (0) #define STATS_INC_FREEMISS(x) do { } while (0) #endif -#if DEBUG -/* Magic nums for obj red zoning. - * Placed in the first word before and the first word after an obj. - */ -#define RED_INACTIVE 0x5A2CF071UL /* when obj is inactive */ -#define RED_ACTIVE 0x170FC2A5UL /* when obj is active */ +#include "slab_vs.h" -/* ...and for poisoning */ -#define POISON_INUSE 0x5a /* for use-uninitialised poisoning */ -#define POISON_FREE 0x6b /* for use-after-free poisoning */ -#define POISON_END 0xa5 /* end-byte of poisoning */ +#if DEBUG -/* memory layout of objects: +/* + * memory layout of objects: * 0 : objp * 0 .. cachep->obj_offset - BYTES_PER_WORD - 1: padding. This ensures that * the end of an object is aligned with the end of the real @@ -508,7 +516,8 @@ struct kmem_cache { * redzone word. * cachep->obj_offset: The real object. * cachep->buffer_size - 2* BYTES_PER_WORD: redzone word [BYTES_PER_WORD long] - * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address [BYTES_PER_WORD long] + * cachep->buffer_size - 1* BYTES_PER_WORD: last caller address + * [BYTES_PER_WORD long] */ static int obj_offset(struct kmem_cache *cachep) { @@ -552,8 +561,8 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp) #endif /* - * Maximum size of an obj (in 2^order pages) - * and absolute limit for the gfp order. + * Maximum size of an obj (in 2^order pages) and absolute limit for the gfp + * order. */ #if defined(CONFIG_LARGE_ALLOCS) #define MAX_OBJ_ORDER 13 /* up to 32Mb */ @@ -573,9 +582,10 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp) #define BREAK_GFP_ORDER_LO 0 static int slab_break_gfp_order = BREAK_GFP_ORDER_LO; -/* Functions for storing/retrieving the cachep and or slab from the - * global 'mem_map'. These are used to find the slab an obj belongs to. - * With kfree(), these are used to find the cache which an obj belongs to. +/* + * Functions for storing/retrieving the cachep and or slab from the page + * allocator. These are used to find the slab an obj belongs to. With kfree(), + * these are used to find the cache which an obj belongs to. */ static inline void page_set_cache(struct page *page, struct kmem_cache *cache) { @@ -584,6 +594,9 @@ static inline void page_set_cache(struct page *page, struct kmem_cache *cache) static inline struct kmem_cache *page_get_cache(struct page *page) { + if (unlikely(PageCompound(page))) + page = (struct page *)page_private(page); + BUG_ON(!PageSlab(page)); return (struct kmem_cache *)page->lru.next; } @@ -594,6 +607,9 @@ static inline void page_set_slab(struct page *page, struct slab *slab) static inline struct slab *page_get_slab(struct page *page) { + if (unlikely(PageCompound(page))) + page = (struct page *)page_private(page); + BUG_ON(!PageSlab(page)); return (struct slab *)page->lru.prev; } @@ -609,7 +625,28 @@ static inline struct slab *virt_to_slab(const void *obj) return page_get_slab(page); } -/* These are the default caches for kmalloc. Custom caches can have other sizes. */ +static inline void *index_to_obj(struct kmem_cache *cache, struct slab *slab, + unsigned int idx) +{ + return slab->s_mem + cache->buffer_size * idx; +} + +/* + * We want to avoid an expensive divide : (offset / cache->buffer_size) + * Using the fact that buffer_size is a constant for a particular cache, + * we can replace (offset / cache->buffer_size) by + * reciprocal_divide(offset, cache->reciprocal_buffer_size) + */ +static inline unsigned int obj_to_index(const struct kmem_cache *cache, + const struct slab *slab, void *obj) +{ + u32 offset = (obj - slab->s_mem); + return reciprocal_divide(offset, cache->reciprocal_buffer_size); +} + +/* + * These are the default caches for kmalloc. Custom caches can have other sizes. + */ struct cache_sizes malloc_sizes[] = { #define CACHE(x) { .cs_size = (x) }, #include @@ -642,25 +679,75 @@ static struct kmem_cache cache_cache = { .limit = BOOT_CPUCACHE_ENTRIES, .shared = 1, .buffer_size = sizeof(struct kmem_cache), - .flags = SLAB_NO_REAP, - .spinlock = SPIN_LOCK_UNLOCKED, .name = "kmem_cache", #if DEBUG .obj_size = sizeof(struct kmem_cache), #endif }; -/* Guard access to the cache-chain. */ -static DEFINE_MUTEX(cache_chain_mutex); -static struct list_head cache_chain; +#define BAD_ALIEN_MAGIC 0x01020304ul + +#ifdef CONFIG_LOCKDEP /* - * vm_enough_memory() looks at this to determine how many - * slab-allocated pages are possibly freeable under pressure + * 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. * - * SLAB_RECLAIM_ACCOUNT turns this on per-slab + * 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 */ -atomic_t slab_reclaim_pages; +static struct lock_class_key on_slab_l3_key; +static struct lock_class_key on_slab_alc_key; + +static inline void init_lock_keys(void) + +{ + int q; + struct cache_sizes *s = malloc_sizes; + + while (s->cs_size != ULONG_MAX) { + for_each_node(q) { + struct array_cache **alc; + int r; + struct kmem_list3 *l3 = s->cs_cachep->nodelists[q]; + if (!l3 || OFF_SLAB(s->cs_cachep)) + continue; + lockdep_set_class(&l3->list_lock, &on_slab_l3_key); + alc = l3->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) + continue; + for_each_node(r) { + if (alc[r]) + lockdep_set_class(&alc[r]->lock, + &on_slab_alc_key); + } + } + s++; + } +} +#else +static inline void init_lock_keys(void) +{ +} +#endif + +/* + * 1. Guard access to the cache-chain. + * 2. Protect sanity of cpu_online_map against cpu hotplug events + */ +static DEFINE_MUTEX(cache_chain_mutex); +static struct list_head cache_chain; /* * chicken and egg problem: delay the per-cpu array allocation @@ -673,19 +760,23 @@ static enum { FULL } g_cpucache_up; -static DEFINE_PER_CPU(struct work_struct, reap_work); +/* + * used by boot code to determine if it can use slab based allocator + */ +int slab_is_available(void) +{ + return g_cpucache_up == FULL; +} -static void free_block(struct kmem_cache *cachep, void **objpp, int len, int node); -static void enable_cpucache(struct kmem_cache *cachep); -static void cache_reap(void *unused); -static int __node_shrink(struct kmem_cache *cachep, int node); +static DEFINE_PER_CPU(struct delayed_work, reap_work); static inline struct array_cache *cpu_cache_get(struct kmem_cache *cachep) { return cachep->array[smp_processor_id()]; } -static inline struct kmem_cache *__find_general_cachep(size_t size, gfp_t gfpflags) +static inline struct kmem_cache *__find_general_cachep(size_t size, + gfp_t gfpflags) { struct cache_sizes *csizep = malloc_sizes; @@ -709,19 +800,19 @@ static inline struct kmem_cache *__find_general_cachep(size_t size, gfp_t gfpfla return csizep->cs_cachep; } -struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) +static struct kmem_cache *kmem_find_general_cachep(size_t size, gfp_t gfpflags) { return __find_general_cachep(size, gfpflags); } -EXPORT_SYMBOL(kmem_find_general_cachep); static size_t slab_mgmt_size(size_t nr_objs, size_t align) { return ALIGN(sizeof(struct slab)+nr_objs*sizeof(kmem_bufctl_t), align); } -/* Calculate the number of objects and left-over bytes for a given - buffer size. */ +/* + * Calculate the number of objects and left-over bytes for a given buffer size. + */ static void cache_estimate(unsigned long gfporder, size_t buffer_size, size_t align, int flags, size_t *left_over, unsigned int *num) @@ -782,13 +873,30 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size, #define slab_error(cachep, msg) __slab_error(__FUNCTION__, cachep, msg) -static void __slab_error(const char *function, struct kmem_cache *cachep, char *msg) +static void __slab_error(const char *function, struct kmem_cache *cachep, + char *msg) { printk(KERN_ERR "slab error in %s(): cache `%s': %s\n", function, cachep->name, msg); dump_stack(); } +/* + * By default on NUMA we use alien caches to stage the freeing of + * objects allocated from other nodes. This causes massive memory + * inefficiencies when using fake NUMA setup to split memory into a + * large number of small nodes, so it can be disabled on the command + * line + */ + +static int use_alien_caches __read_mostly = 1; +static int __init noaliencache_setup(char *s) +{ + use_alien_caches = 0; + return 1; +} +__setup("noaliencache", noaliencache_setup); + #ifdef CONFIG_NUMA /* * Special reaping functions for NUMA systems called from cache_reap(). @@ -804,9 +912,9 @@ static void init_reap_node(int cpu) node = next_node(cpu_to_node(cpu), node_online_map); if (node == MAX_NUMNODES) - node = 0; + node = first_node(node_online_map); - __get_cpu_var(reap_node) = node; + per_cpu(reap_node, cpu) = node; } static void next_reap_node(void) @@ -839,17 +947,18 @@ static void next_reap_node(void) */ static void __devinit start_cpu_timer(int cpu) { - struct work_struct *reap_work = &per_cpu(reap_work, cpu); + struct delayed_work *reap_work = &per_cpu(reap_work, cpu); /* * When this gets called from do_initcalls via cpucache_init(), * init_workqueues() has already run, so keventd will be setup * at that time. */ - if (keventd_up() && reap_work->func == NULL) { + if (keventd_up() && reap_work->work.func == NULL) { init_reap_node(cpu); - INIT_WORK(reap_work, cache_reap, NULL); - schedule_delayed_work_on(cpu, reap_work, HZ + 3 * cpu); + INIT_DELAYED_WORK(reap_work, cache_reap); + schedule_delayed_work_on(cpu, reap_work, + __round_jiffies_relative(HZ, cpu)); } } @@ -870,8 +979,65 @@ static struct array_cache *alloc_arraycache(int node, int entries, return nc; } -#ifdef CONFIG_NUMA -static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int); +/* + * Transfer objects in one arraycache to another. + * Locking must be handled by the caller. + * + * Return the number of entries transferred. + */ +static int transfer_objects(struct array_cache *to, + struct array_cache *from, unsigned int max) +{ + /* Figure out how many entries to transfer */ + int nr = min(min(from->avail, max), to->limit - to->avail); + + if (!nr) + return 0; + + memcpy(to->entry + to->avail, from->entry + from->avail -nr, + sizeof(void *) *nr); + + from->avail -= nr; + to->avail += nr; + to->touched = 1; + return nr; +} + +#ifndef CONFIG_NUMA + +#define drain_alien_cache(cachep, alien) do { } while (0) +#define reap_alien(cachep, l3) do { } while (0) + +static inline struct array_cache **alloc_alien_cache(int node, int limit) +{ + return (struct array_cache **)BAD_ALIEN_MAGIC; +} + +static inline void free_alien_cache(struct array_cache **ac_ptr) +{ +} + +static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) +{ + return 0; +} + +static inline void *alternate_node_alloc(struct kmem_cache *cachep, + gfp_t flags) +{ + return NULL; +} + +static inline void *____cache_alloc_node(struct kmem_cache *cachep, + gfp_t flags, int nodeid) +{ + return NULL; +} + +#else /* CONFIG_NUMA */ + +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) { @@ -906,10 +1072,8 @@ static void free_alien_cache(struct array_cache **ac_ptr) if (!ac_ptr) return; - for_each_node(i) kfree(ac_ptr[i]); - kfree(ac_ptr); } @@ -920,6 +1084,14 @@ static void __drain_alien_cache(struct kmem_cache *cachep, if (ac->avail) { spin_lock(&rl3->list_lock); + /* + * Stuff objects into the remote nodes shared array first. + * That way we could avoid the overhead of putting the objects + * into the free lists and getting them back later. + */ + if (rl3->shared) + transfer_objects(rl3->shared, ac, ac->limit); + free_block(cachep, ac->entry, ac->avail, node); ac->avail = 0; spin_unlock(&rl3->list_lock); @@ -935,15 +1107,16 @@ static void reap_alien(struct kmem_cache *cachep, struct kmem_list3 *l3) if (l3->alien) { struct array_cache *ac = l3->alien[node]; - if (ac && ac->avail) { - spin_lock_irq(&ac->lock); + + if (ac && ac->avail && spin_trylock_irq(&ac->lock)) { __drain_alien_cache(cachep, ac, node); spin_unlock_irq(&ac->lock); } } } -static void drain_alien_cache(struct kmem_cache *cachep, struct array_cache **alien) +static void drain_alien_cache(struct kmem_cache *cachep, + struct array_cache **alien) { int i = 0; struct array_cache *ac; @@ -958,23 +1131,45 @@ static void drain_alien_cache(struct kmem_cache *cachep, struct array_cache **al } } } -#else - -#define drain_alien_cache(cachep, alien) do { } while (0) -#define reap_alien(cachep, l3) do { } while (0) -static inline struct array_cache **alloc_alien_cache(int node, int limit) +static inline int cache_free_alien(struct kmem_cache *cachep, void *objp) { - return (struct array_cache **) 0x01020304ul; -} + struct slab *slabp = virt_to_slab(objp); + int nodeid = slabp->nodeid; + struct kmem_list3 *l3; + struct array_cache *alien = NULL; + int node; -static inline void free_alien_cache(struct array_cache **ac_ptr) -{ -} + node = numa_node_id(); + + /* + * Make sure we are not freeing a object from another node to the array + * cache on this cpu. + */ + if (likely(slabp->nodeid == node) || unlikely(!use_alien_caches)) + return 0; + l3 = cachep->nodelists[node]; + STATS_INC_NODEFREES(cachep); + if (l3->alien && l3->alien[nodeid]) { + alien = l3->alien[nodeid]; + spin_lock(&alien->lock); + if (unlikely(alien->avail == alien->limit)) { + STATS_INC_ACOVERFLOW(cachep); + __drain_alien_cache(cachep, alien, nodeid); + } + alien->entry[alien->avail++] = objp; + spin_unlock(&alien->lock); + } else { + spin_lock(&(cachep->nodelists[nodeid])->list_lock); + free_block(cachep, &objp, 1, nodeid); + spin_unlock(&(cachep->nodelists[nodeid])->list_lock); + } + return 1; +} #endif -static int __devinit cpuup_callback(struct notifier_block *nfb, +static int __cpuinit cpuup_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { long cpu = (long)hcpu; @@ -986,20 +1181,22 @@ static int __devinit cpuup_callback(struct notifier_block *nfb, switch (action) { case CPU_UP_PREPARE: mutex_lock(&cache_chain_mutex); - /* we need to do this right in the beginning since + /* + * We need to do this right in the beginning since * alloc_arraycache's are going to use this list. * kmalloc_node allows us to add the slab to the right * kmem_list3 and not this cpu's kmem_list3 */ list_for_each_entry(cachep, &cache_chain, next) { - /* setup the size64 kmemlist for cpu before we can + /* + * Set up the size64 kmemlist for cpu before we can * begin anything. Make sure some other cpu on this * node has not already allocated this */ if (!cachep->nodelists[node]) { - if (!(l3 = kmalloc_node(memsize, - GFP_KERNEL, node))) + l3 = kmalloc_node(memsize, GFP_KERNEL, node); + if (!l3) goto bad; kmem_list3_init(l3); l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + @@ -1015,17 +1212,19 @@ static int __devinit cpuup_callback(struct notifier_block *nfb, spin_lock_irq(&cachep->nodelists[node]->list_lock); cachep->nodelists[node]->free_limit = - (1 + nr_cpus_node(node)) * - cachep->batchcount + cachep->num; + (1 + nr_cpus_node(node)) * + cachep->batchcount + cachep->num; spin_unlock_irq(&cachep->nodelists[node]->list_lock); } - /* Now we can go ahead with allocating the shared array's - & array cache's */ + /* + * Now we can go ahead with allocating the shared arrays and + * array caches + */ list_for_each_entry(cachep, &cache_chain, next) { struct array_cache *nc; struct array_cache *shared; - struct array_cache **alien; + struct array_cache **alien = NULL; nc = alloc_arraycache(node, cachep->limit, cachep->batchcount); @@ -1037,11 +1236,12 @@ static int __devinit cpuup_callback(struct notifier_block *nfb, if (!shared) goto bad; - alien = alloc_alien_cache(node, cachep->limit); - if (!alien) - goto bad; + if (use_alien_caches) { + alien = alloc_alien_cache(node, cachep->limit); + if (!alien) + goto bad; + } cachep->array[cpu] = nc; - l3 = cachep->nodelists[node]; BUG_ON(!l3); @@ -1061,16 +1261,21 @@ static int __devinit cpuup_callback(struct notifier_block *nfb, } #endif spin_unlock_irq(&l3->list_lock); - kfree(shared); free_alien_cache(alien); } - mutex_unlock(&cache_chain_mutex); break; case CPU_ONLINE: + mutex_unlock(&cache_chain_mutex); start_cpu_timer(cpu); break; #ifdef CONFIG_HOTPLUG_CPU + case CPU_DOWN_PREPARE: + mutex_lock(&cache_chain_mutex); + break; + case CPU_DOWN_FAILED: + mutex_unlock(&cache_chain_mutex); + break; case CPU_DEAD: /* * Even if all the cpus of a node are down, we don't free the @@ -1081,9 +1286,8 @@ static int __devinit cpuup_callback(struct notifier_block *nfb, * gets destroyed at kmem_cache_destroy(). */ /* fall thru */ +#endif case CPU_UP_CANCELED: - mutex_lock(&cache_chain_mutex); - list_for_each_entry(cachep, &cache_chain, next) { struct array_cache *nc; struct array_cache *shared; @@ -1140,43 +1344,46 @@ free_array_cache: l3 = cachep->nodelists[node]; if (!l3) continue; - spin_lock_irq(&l3->list_lock); - /* free slabs belonging to this node */ - __node_shrink(cachep, node); - spin_unlock_irq(&l3->list_lock); + drain_freelist(cachep, l3, l3->free_objects); } mutex_unlock(&cache_chain_mutex); break; -#endif } return NOTIFY_OK; - bad: - mutex_unlock(&cache_chain_mutex); +bad: return NOTIFY_BAD; } -static struct notifier_block cpucache_notifier = { &cpuup_callback, NULL, 0 }; +static struct notifier_block __cpuinitdata cpucache_notifier = { + &cpuup_callback, NULL, 0 +}; /* * swap the static kmem_list3 with kmalloced memory */ -static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, int nodeid) +static void init_list(struct kmem_cache *cachep, struct kmem_list3 *list, + int nodeid) { struct kmem_list3 *ptr; - BUG_ON(cachep->nodelists[nodeid] != list); ptr = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, nodeid); BUG_ON(!ptr); local_irq_disable(); memcpy(ptr, list, sizeof(struct kmem_list3)); + /* + * Do not assume that spinlocks can be initialized via memcpy: + */ + spin_lock_init(&ptr->list_lock); + MAKE_ALL_LISTS(cachep, ptr, nodeid); cachep->nodelists[nodeid] = ptr; local_irq_enable(); } -/* Initialisation. - * Called after the gfp() functions have been enabled, and before smp_init(). +/* + * Initialisation. Called after the page allocator have been initialised and + * before smp_init(). */ void __init kmem_cache_init(void) { @@ -1185,6 +1392,7 @@ void __init kmem_cache_init(void) struct cache_names *names; int i; int order; + int node; for (i = 0; i < NUM_INIT_LISTS; i++) { kmem_list3_init(&initkmem_list3[i]); @@ -1201,9 +1409,9 @@ void __init kmem_cache_init(void) /* Bootstrap is tricky, because several objects are allocated * from caches that do not exist yet: - * 1) initialize the cache_cache cache: it contains the struct kmem_cache - * structures of all caches, except cache_cache itself: cache_cache - * is statically allocated. + * 1) initialize the cache_cache cache: it contains the struct + * kmem_cache structures of all caches, except cache_cache itself: + * cache_cache is statically allocated. * Initially an __init data area is used for the head array and the * kmem_list3 structures, it's replaced with a kmalloc allocated * array at the end of the bootstrap. @@ -1219,14 +1427,19 @@ void __init kmem_cache_init(void) * 6) Resize the head arrays of the kmalloc caches to their final sizes. */ + node = numa_node_id(); + /* 1) create the cache_cache */ INIT_LIST_HEAD(&cache_chain); list_add(&cache_cache.next, &cache_chain); cache_cache.colour_off = cache_line_size(); cache_cache.array[smp_processor_id()] = &initarray_cache.cache; - cache_cache.nodelists[numa_node_id()] = &initkmem_list3[CACHE_CACHE]; + cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE]; - cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, cache_line_size()); + cache_cache.buffer_size = ALIGN(cache_cache.buffer_size, + cache_line_size()); + cache_cache.reciprocal_buffer_size = + reciprocal_value(cache_cache.buffer_size); for (order = 0; order < MAX_ORDER; order++) { cache_estimate(order, cache_cache.buffer_size, @@ -1234,8 +1447,7 @@ void __init kmem_cache_init(void) if (cache_cache.num) break; } - if (!cache_cache.num) - BUG(); + BUG_ON(!cache_cache.num); cache_cache.gfporder = order; cache_cache.colour = left_over / cache_cache.colour_off; cache_cache.slab_size = ALIGN(cache_cache.num * sizeof(kmem_bufctl_t) + @@ -1245,24 +1457,28 @@ void __init kmem_cache_init(void) sizes = malloc_sizes; names = cache_names; - /* Initialize the caches that provide memory for the array cache - * and the kmem_list3 structures first. - * Without this, further allocations will bug + /* + * Initialize the caches that provide memory for the array cache and the + * kmem_list3 structures first. Without this, further allocations will + * bug. */ sizes[INDEX_AC].cs_cachep = kmem_cache_create(names[INDEX_AC].name, - sizes[INDEX_AC].cs_size, - ARCH_KMALLOC_MINALIGN, - (ARCH_KMALLOC_FLAGS | - SLAB_PANIC), NULL, NULL); + sizes[INDEX_AC].cs_size, + ARCH_KMALLOC_MINALIGN, + ARCH_KMALLOC_FLAGS|SLAB_PANIC, + NULL, NULL); - if (INDEX_AC != INDEX_L3) + if (INDEX_AC != INDEX_L3) { sizes[INDEX_L3].cs_cachep = - kmem_cache_create(names[INDEX_L3].name, - sizes[INDEX_L3].cs_size, - ARCH_KMALLOC_MINALIGN, - (ARCH_KMALLOC_FLAGS | SLAB_PANIC), NULL, - NULL); + kmem_cache_create(names[INDEX_L3].name, + sizes[INDEX_L3].cs_size, + ARCH_KMALLOC_MINALIGN, + ARCH_KMALLOC_FLAGS|SLAB_PANIC, + NULL, NULL); + } + + slab_early_init = 0; while (sizes->cs_size != ULONG_MAX) { /* @@ -1272,34 +1488,26 @@ void __init kmem_cache_init(void) * Note for systems short on memory removing the alignment will * allow tighter packing of the smaller caches. */ - if (!sizes->cs_cachep) + if (!sizes->cs_cachep) { sizes->cs_cachep = kmem_cache_create(names->name, - sizes->cs_size, - ARCH_KMALLOC_MINALIGN, - (ARCH_KMALLOC_FLAGS - | SLAB_PANIC), - NULL, NULL); - - /* Inc off-slab bufctl limit until the ceiling is hit. */ - if (!(OFF_SLAB(sizes->cs_cachep))) { - offslab_limit = sizes->cs_size - sizeof(struct slab); - offslab_limit /= sizeof(kmem_bufctl_t); + sizes->cs_size, + ARCH_KMALLOC_MINALIGN, + ARCH_KMALLOC_FLAGS|SLAB_PANIC, + NULL, NULL); } sizes->cs_dmacachep = kmem_cache_create(names->name_dma, - sizes->cs_size, - ARCH_KMALLOC_MINALIGN, - (ARCH_KMALLOC_FLAGS | - SLAB_CACHE_DMA | - SLAB_PANIC), NULL, - NULL); - + sizes->cs_size, + ARCH_KMALLOC_MINALIGN, + ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| + SLAB_PANIC, + NULL, NULL); sizes++; names++; } /* 4) Replace the bootstrap head arrays */ { - void *ptr; + struct array_cache *ptr; ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); @@ -1307,6 +1515,11 @@ void __init kmem_cache_init(void) BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); memcpy(ptr, cpu_cache_get(&cache_cache), sizeof(struct arraycache_init)); + /* + * Do not assume that spinlocks can be initialized via memcpy: + */ + spin_lock_init(&ptr->lock); + cache_cache.array[smp_processor_id()] = ptr; local_irq_enable(); @@ -1317,25 +1530,29 @@ void __init kmem_cache_init(void) != &initarray_generic.cache); memcpy(ptr, cpu_cache_get(malloc_sizes[INDEX_AC].cs_cachep), sizeof(struct arraycache_init)); + /* + * Do not assume that spinlocks can be initialized via memcpy: + */ + spin_lock_init(&ptr->lock); + malloc_sizes[INDEX_AC].cs_cachep->array[smp_processor_id()] = ptr; local_irq_enable(); } /* 5) Replace the bootstrap kmem_list3's */ { - int node; + int nid; + /* Replace the static kmem_list3 structures for the boot cpu */ - init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], - numa_node_id()); + init_list(&cache_cache, &initkmem_list3[CACHE_CACHE], node); - for_each_online_node(node) { + for_each_online_node(nid) { init_list(malloc_sizes[INDEX_AC].cs_cachep, - &initkmem_list3[SIZE_AC + node], node); + &initkmem_list3[SIZE_AC + nid], nid); if (INDEX_AC != INDEX_L3) { init_list(malloc_sizes[INDEX_L3].cs_cachep, - &initkmem_list3[SIZE_L3 + node], - node); + &initkmem_list3[SIZE_L3 + nid], nid); } } } @@ -1345,20 +1562,27 @@ void __init kmem_cache_init(void) struct kmem_cache *cachep; mutex_lock(&cache_chain_mutex); list_for_each_entry(cachep, &cache_chain, next) - enable_cpucache(cachep); + if (enable_cpucache(cachep)) + BUG(); mutex_unlock(&cache_chain_mutex); } + /* Annotate slab for lockdep -- annotate the malloc caches */ + init_lock_keys(); + + /* Done! */ g_cpucache_up = FULL; - /* Register a cpu startup notifier callback - * that initializes cpu_cache_get for all new cpus + /* + * Register a cpu startup notifier callback that initializes + * cpu_cache_get for all new cpus */ register_cpu_notifier(&cpucache_notifier); - /* The reap timers are started later, with a module init call: - * That part of the kernel is not yet operational. + /* + * The reap timers are started later, with a module init call: That part + * of the kernel is not yet operational. */ } @@ -1366,16 +1590,13 @@ static int __init cpucache_init(void) { int cpu; - /* - * Register the timers that return unneeded - * pages to gfp. + /* + * Register the timers that return unneeded pages to the page allocator */ for_each_online_cpu(cpu) - start_cpu_timer(cpu); - + start_cpu_timer(cpu); return 0; } - __initcall(cpucache_init); /* @@ -1388,24 +1609,33 @@ __initcall(cpucache_init); static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) { struct page *page; - void *addr; + int nr_pages; int i; +#ifndef CONFIG_MMU + /* + * Nommu uses slab's for process anonymous memory allocations, and thus + * requires __GFP_COMP to properly refcount higher order allocations + */ + flags |= __GFP_COMP; +#endif + flags |= cachep->gfpflags; + page = alloc_pages_node(nodeid, flags, cachep->gfporder); if (!page) return NULL; - addr = page_address(page); - i = (1 << cachep->gfporder); + nr_pages = (1 << cachep->gfporder); if (cachep->flags & SLAB_RECLAIM_ACCOUNT) - atomic_add(i, &slab_reclaim_pages); - add_page_state(nr_slab, i); - while (i--) { - SetPageSlab(page); - page++; - } - return addr; + add_zone_page_state(page_zone(page), + NR_SLAB_RECLAIMABLE, nr_pages); + else + add_zone_page_state(page_zone(page), + NR_SLAB_UNRECLAIMABLE, nr_pages); + for (i = 0; i < nr_pages; i++) + __SetPageSlab(page + i); + return page_address(page); } /* @@ -1417,17 +1647,20 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr) struct page *page = virt_to_page(addr); const unsigned long nr_freed = i; + if (cachep->flags & SLAB_RECLAIM_ACCOUNT) + sub_zone_page_state(page_zone(page), + NR_SLAB_RECLAIMABLE, nr_freed); + else + sub_zone_page_state(page_zone(page), + NR_SLAB_UNRECLAIMABLE, nr_freed); while (i--) { - if (!TestClearPageSlab(page)) - BUG(); + BUG_ON(!PageSlab(page)); + __ClearPageSlab(page); page++; } - sub_page_state(nr_slab, nr_freed); if (current->reclaim_state) current->reclaim_state->reclaimed_slab += nr_freed; free_pages((unsigned long)addr, cachep->gfporder); - if (cachep->flags & SLAB_RECLAIM_ACCOUNT) - atomic_sub(1 << cachep->gfporder, &slab_reclaim_pages); } static void kmem_rcu_free(struct rcu_head *head) @@ -1488,11 +1721,32 @@ static void poison_obj(struct kmem_cache *cachep, void *addr, unsigned char val) static void dump_line(char *data, int offset, int limit) { int i; + unsigned char error = 0; + int bad_count = 0; + printk(KERN_ERR "%03x:", offset); for (i = 0; i < limit; i++) { + if (data[offset + i] != POISON_FREE) { + error = data[offset + i]; + bad_count++; + } printk(" %02x", (unsigned char)data[offset + i]); } printk("\n"); + + if (bad_count == 1) { + error ^= POISON_FREE; + if (!(error & (error - 1))) { + printk(KERN_ERR "Single bit error detected. Probably " + "bad RAM.\n"); +#ifdef CONFIG_X86 + printk(KERN_ERR "Run memtest86+ or a similar memory " + "test tool.\n"); +#else + printk(KERN_ERR "Run a memory test tool.\n"); +#endif + } + } } #endif @@ -1505,15 +1759,15 @@ static void print_objinfo(struct kmem_cache *cachep, void *objp, int lines) if (cachep->flags & SLAB_RED_ZONE) { printk(KERN_ERR "Redzone: 0x%lx/0x%lx.\n", - *dbg_redzone1(cachep, objp), - *dbg_redzone2(cachep, objp)); + *dbg_redzone1(cachep, objp), + *dbg_redzone2(cachep, objp)); } if (cachep->flags & SLAB_STORE_USER) { printk(KERN_ERR "Last user: [<%p>]", - *dbg_userword(cachep, objp)); + *dbg_userword(cachep, objp)); print_symbol("(%s)", - (unsigned long)*dbg_userword(cachep, objp)); + (unsigned long)*dbg_userword(cachep, objp)); printk("\n"); } realobj = (char *)objp + obj_offset(cachep); @@ -1546,9 +1800,10 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp) /* Print header */ if (lines == 0) { printk(KERN_ERR - "Slab corruption: start=%p, len=%d\n", - realobj, size); + "Slab corruption: (%s) start=%p, len=%d\n", + print_tainted(), realobj, size); print_objinfo(cachep, objp, 0); + dump_stack(); } /* Hexdump the affected line */ i = (i / 16) * 16; @@ -1568,18 +1823,18 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp) * exist: */ struct slab *slabp = virt_to_slab(objp); - int objnr; + unsigned int objnr; - objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; + objnr = obj_to_index(cachep, slabp, objp); if (objnr) { - objp = slabp->s_mem + (objnr - 1) * cachep->buffer_size; + objp = index_to_obj(cachep, slabp, objnr - 1); realobj = (char *)objp + obj_offset(cachep); printk(KERN_ERR "Prev obj: start=%p, len=%d\n", realobj, size); print_objinfo(cachep, objp, 2); } if (objnr + 1 < cachep->num) { - objp = slabp->s_mem + (objnr + 1) * cachep->buffer_size; + objp = index_to_obj(cachep, slabp, objnr + 1); realobj = (char *)objp + obj_offset(cachep); printk(KERN_ERR "Next obj: start=%p, len=%d\n", realobj, size); @@ -1591,22 +1846,25 @@ static void check_poison_obj(struct kmem_cache *cachep, void *objp) #if DEBUG /** - * slab_destroy_objs - call the registered destructor for each object in - * a slab that is to be destroyed. + * slab_destroy_objs - destroy a slab and its objects + * @cachep: cache pointer being destroyed + * @slabp: slab pointer being destroyed + * + * Call the registered destructor for each object in a slab that is being + * destroyed. */ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) { int i; for (i = 0; i < cachep->num; i++) { - void *objp = slabp->s_mem + cachep->buffer_size * i; + void *objp = index_to_obj(cachep, slabp, i); if (cachep->flags & SLAB_POISON) { #ifdef CONFIG_DEBUG_PAGEALLOC - if ((cachep->buffer_size % PAGE_SIZE) == 0 - && OFF_SLAB(cachep)) + if (cachep->buffer_size % PAGE_SIZE == 0 && + OFF_SLAB(cachep)) kernel_map_pages(virt_to_page(objp), - cachep->buffer_size / PAGE_SIZE, - 1); + cachep->buffer_size / PAGE_SIZE, 1); else check_poison_obj(cachep, objp); #else @@ -1631,7 +1889,7 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) if (cachep->dtor) { int i; for (i = 0; i < cachep->num; i++) { - void *objp = slabp->s_mem + cachep->buffer_size * i; + void *objp = index_to_obj(cachep, slabp, i); (cachep->dtor) (objp, cachep, 0); } } @@ -1639,9 +1897,13 @@ static void slab_destroy_objs(struct kmem_cache *cachep, struct slab *slabp) #endif /** + * slab_destroy - destroy and release all objects in a slab + * @cachep: cache pointer being destroyed + * @slabp: slab 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. + * Before calling the slab must have been unlinked from the cache. The + * cache-lock is not held/needed. */ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) { @@ -1662,8 +1924,10 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) } } -/* For setting up all the kmem_list3s for cache whose buffer_size is same - as size of kmem_list3. */ +/* + * For setting up all the kmem_list3s for cache whose buffer_size is same as + * size of kmem_list3. + */ static void set_up_list3s(struct kmem_cache *cachep, int index) { int node; @@ -1676,6 +1940,27 @@ static void set_up_list3s(struct kmem_cache *cachep, int index) } } +static void __kmem_cache_destroy(struct kmem_cache *cachep) +{ + int i; + struct kmem_list3 *l3; + + for_each_online_cpu(i) + kfree(cachep->array[i]); + + /* NUMA: free the list3 structures */ + for_each_online_node(i) { + l3 = cachep->nodelists[i]; + if (l3) { + kfree(l3->shared); + free_alien_cache(l3->alien); + kfree(l3); + } + } + kmem_cache_free(&cache_cache, cachep); +} + + /** * calculate_slab_order - calculate size (page order) of slabs * @cachep: pointer to the cache that is being created @@ -1689,13 +1974,14 @@ static void set_up_list3s(struct kmem_cache *cachep, int index) * high order pages for slabs. When the gfp() functions are more friendly * towards high-order requests, this should be changed. */ -static inline size_t calculate_slab_order(struct kmem_cache *cachep, +static size_t calculate_slab_order(struct kmem_cache *cachep, size_t size, size_t align, unsigned long flags) { + unsigned long offslab_limit; size_t left_over = 0; int gfporder; - for (gfporder = 0 ; gfporder <= MAX_GFP_ORDER; gfporder++) { + for (gfporder = 0; gfporder <= MAX_GFP_ORDER; gfporder++) { unsigned int num; size_t remainder; @@ -1703,9 +1989,18 @@ static inline size_t calculate_slab_order(struct kmem_cache *cachep, if (!num) continue; - /* More than offslab_limit objects will cause problems */ - if ((flags & CFLGS_OFF_SLAB) && num > offslab_limit) - break; + if (flags & CFLGS_OFF_SLAB) { + /* + * Max number of objs-per-slab for caches which + * use off-slab slabs. Needed to avoid a possible + * looping condition in cache_grow(). + */ + offslab_limit = size - sizeof(struct slab); + offslab_limit /= sizeof(kmem_bufctl_t); + + if (num > offslab_limit) + break; + } /* Found something acceptable - save it away */ cachep->num = num; @@ -1730,12 +2025,66 @@ static inline size_t calculate_slab_order(struct kmem_cache *cachep, /* * Acceptable internal fragmentation? */ - if ((left_over * 8) <= (PAGE_SIZE << gfporder)) + if (left_over * 8 <= (PAGE_SIZE << gfporder)) break; } return left_over; } +static int setup_cpu_cache(struct kmem_cache *cachep) +{ + if (g_cpucache_up == FULL) + return enable_cpucache(cachep); + + if (g_cpucache_up == NONE) { + /* + * Note: the first 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_list3)) is + * the first cache, then we need to set up all its list3s, + * otherwise the creation of further caches will BUG(). + */ + set_up_list3s(cachep, SIZE_AC); + if (INDEX_AC == INDEX_L3) + g_cpucache_up = PARTIAL_L3; + else + g_cpucache_up = PARTIAL_AC; + } else { + cachep->array[smp_processor_id()] = + kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); + + if (g_cpucache_up == PARTIAL_AC) { + set_up_list3s(cachep, SIZE_L3); + g_cpucache_up = PARTIAL_L3; + } else { + int node; + for_each_online_node(node) { + cachep->nodelists[node] = + kmalloc_node(sizeof(struct kmem_list3), + GFP_KERNEL, node); + BUG_ON(!cachep->nodelists[node]); + kmem_list3_init(cachep->nodelists[node]); + } + } + } + cachep->nodelists[numa_node_id()]->next_reap = + jiffies + REAPTIMEOUT_LIST3 + + ((unsigned long)cachep) % REAPTIMEOUT_LIST3; + + cpu_cache_get(cachep)->avail = 0; + cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; + cpu_cache_get(cachep)->batchcount = 1; + cpu_cache_get(cachep)->touched = 0; + cachep->batchcount = 1; + cachep->limit = BOOT_CPUCACHE_ENTRIES; + return 0; +} + /** * kmem_cache_create - Create a cache. * @name: A string which is used in /proc/slabinfo to identify this cache. @@ -1751,9 +2100,8 @@ static inline size_t calculate_slab_order(struct kmem_cache *cachep, * and the @dtor is run before the pages are handed back. * * @name must be valid until the cache is destroyed. This implies that - * the module calling this has to destroy the cache before getting - * unloaded. - * + * the module calling this has to destroy the cache before getting unloaded. + * * The flags are * * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) @@ -1762,45 +2110,36 @@ static inline size_t calculate_slab_order(struct kmem_cache *cachep, * %SLAB_RED_ZONE - Insert `Red' zones around the allocated memory to check * for buffer overruns. * - * %SLAB_NO_REAP - Don't automatically reap this cache when we're under - * memory pressure. - * * %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware * cacheline. This can be beneficial if you're counting cycles as closely * as davem. */ struct kmem_cache * kmem_cache_create (const char *name, size_t size, size_t align, - unsigned long flags, void (*ctor)(void*, struct kmem_cache *, unsigned long), + unsigned long flags, + void (*ctor)(void*, struct kmem_cache *, unsigned long), void (*dtor)(void*, struct kmem_cache *, unsigned long)) { size_t left_over, slab_size, ralign; - struct kmem_cache *cachep = NULL; - struct list_head *p; + struct kmem_cache *cachep = NULL, *pc; /* * Sanity checks... these are all serious usage bugs. */ - if ((!name) || - in_interrupt() || - (size < BYTES_PER_WORD) || + if (!name || in_interrupt() || (size < BYTES_PER_WORD) || (size > (1 << MAX_OBJ_ORDER) * PAGE_SIZE) || (dtor && !ctor)) { - printk(KERN_ERR "%s: Early error in slab %s\n", - __FUNCTION__, name); + printk(KERN_ERR "%s: Early error in slab %s\n", __FUNCTION__, + name); BUG(); } /* - * Prevent CPUs from coming and going. - * lock_cpu_hotplug() nests outside cache_chain_mutex + * We use cache_chain_mutex to ensure a consistent view of + * cpu_online_map as well. Please see cpuup_callback */ - lock_cpu_hotplug(); - mutex_lock(&cache_chain_mutex); - list_for_each(p, &cache_chain) { - struct kmem_cache *pc = list_entry(p, struct kmem_cache, next); - mm_segment_t old_fs = get_fs(); + list_for_each_entry(pc, &cache_chain, next) { char tmp; int res; @@ -1809,9 +2148,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, * destroy its slab cache and no-one else reuses the vmalloc * area of the module. Print a warning. */ - set_fs(KERNEL_DS); - res = __get_user(tmp, pc->name); - set_fs(old_fs); + res = probe_kernel_address(pc->name, tmp); if (res) { printk("SLAB: cache with size %d has lost its name\n", pc->buffer_size); @@ -1840,8 +2177,7 @@ kmem_cache_create (const char *name, size_t size, size_t align, * above the next power of two: caches with object sizes just above a * power of two have a significant amount of internal fragmentation. */ - if ((size < 4096 - || fls(size - 1) == fls(size - 1 + 3 * BYTES_PER_WORD))) + if (size < 4096 || fls(size - 1) == fls(size-1 + 3 * BYTES_PER_WORD)) flags |= SLAB_RED_ZONE | SLAB_STORE_USER; if (!(flags & SLAB_DESTROY_BY_RCU)) flags |= SLAB_POISON; @@ -1853,13 +2189,13 @@ kmem_cache_create (const char *name, size_t size, size_t align, BUG_ON(dtor); /* - * Always checks flags, a caller might be expecting debug - * support which isn't available. + * Always checks flags, a caller might be expecting debug support which + * isn't available. */ - if (flags & ~CREATE_MASK) - BUG(); + BUG_ON(flags & ~CREATE_MASK); - /* Check that size is in terms of words. This is needed to avoid + /* + * Check that size is in terms of words. This is needed to avoid * unaligned accesses for some archs when redzoning is used, and makes * sure any on-slab bufctl's are also correctly aligned. */ @@ -1868,12 +2204,14 @@ kmem_cache_create (const char *name, size_t size, size_t align, size &= ~(BYTES_PER_WORD - 1); } - /* calculate out the final buffer alignment: */ + /* calculate the final buffer alignment: */ + /* 1) arch recommendation: can be overridden for debug */ if (flags & SLAB_HWCACHE_ALIGN) { - /* Default alignment: as specified by the arch code. - * Except if an object is really small, then squeeze multiple - * objects into one cacheline. + /* + * Default alignment: as specified by the arch code. Except if + * an object is really small, then squeeze multiple objects into + * one cacheline. */ ralign = cache_line_size(); while (size <= ralign / 2) @@ -1881,46 +2219,52 @@ kmem_cache_create (const char *name, size_t size, size_t align, } else { ralign = BYTES_PER_WORD; } - /* 2) arch mandated alignment: disables debug if necessary */ + + /* + * Redzoning and user store require word alignment. Note this will be + * overridden by architecture or caller mandated alignment if either + * is greater than BYTES_PER_WORD. + */ + if (flags & SLAB_RED_ZONE || flags & SLAB_STORE_USER) + ralign = BYTES_PER_WORD; + + /* 2) arch mandated alignment */ if (ralign < ARCH_SLAB_MINALIGN) { ralign = ARCH_SLAB_MINALIGN; - if (ralign > BYTES_PER_WORD) - flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); } - /* 3) caller mandated alignment: disables debug if necessary */ + /* 3) caller mandated alignment */ if (ralign < align) { ralign = align; - if (ralign > BYTES_PER_WORD) - flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); } - /* 4) Store it. Note that the debug code below can reduce - * the alignment to BYTES_PER_WORD. + /* disable debug if necessary */ + if (ralign > BYTES_PER_WORD) + flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER); + /* + * 4) Store it. */ align = ralign; /* Get cache's description obj. */ - cachep = kmem_cache_alloc(&cache_cache, SLAB_KERNEL); + cachep = kmem_cache_zalloc(&cache_cache, GFP_KERNEL); if (!cachep) goto oops; - memset(cachep, 0, sizeof(struct kmem_cache)); #if DEBUG cachep->obj_size = size; + /* + * Both debugging options require word-alignment which is calculated + * into align above. + */ if (flags & SLAB_RED_ZONE) { - /* redzoning only works with word aligned caches */ - align = BYTES_PER_WORD; - /* add space for red zone words */ cachep->obj_offset += BYTES_PER_WORD; size += 2 * BYTES_PER_WORD; } if (flags & SLAB_STORE_USER) { - /* user store requires word alignment and - * one word storage behind the end of the real - * object. + /* user store requires one word storage behind the end of + * the real object. */ - align = BYTES_PER_WORD; size += BYTES_PER_WORD; } #if FORCED_DEBUG && defined(CONFIG_DEBUG_PAGEALLOC) @@ -1932,8 +2276,12 @@ kmem_cache_create (const char *name, size_t size, size_t align, #endif #endif - /* Determine if the slab management is 'on' or 'off' slab. */ - if (size >= (PAGE_SIZE >> 3)) + /* + * Determine if the slab management is 'on' or 'off' slab. + * (bootstrapping cannot cope with offslab caches so don't do + * it too early on.) + */ + if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init) /* * Size is large, assume best to place the slab management obj * off-slab (should allow better packing of objs). @@ -1978,79 +2326,37 @@ kmem_cache_create (const char *name, size_t size, size_t align, cachep->gfpflags = 0; if (flags & SLAB_CACHE_DMA) cachep->gfpflags |= GFP_DMA; - spin_lock_init(&cachep->spinlock); cachep->buffer_size = size; + cachep->reciprocal_buffer_size = reciprocal_value(size); - if (flags & CFLGS_OFF_SLAB) + if (flags & CFLGS_OFF_SLAB) { cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u); + /* + * This is a possibility for one of the malloc_sizes caches. + * But since we go off slab only for object size greater than + * PAGE_SIZE/8, and malloc_sizes gets created in ascending order, + * this should not happen at all. + * But leave a BUG_ON for some lucky dude. + */ + BUG_ON(!cachep->slabp_cache); + } cachep->ctor = ctor; cachep->dtor = dtor; cachep->name = name; - - if (g_cpucache_up == FULL) { - enable_cpucache(cachep); - } else { - if (g_cpucache_up == NONE) { - /* Note: the first 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_list3)) is the first cache, - * then we need to set up all its list3s, otherwise - * the creation of further caches will BUG(). - */ - set_up_list3s(cachep, SIZE_AC); - if (INDEX_AC == INDEX_L3) - g_cpucache_up = PARTIAL_L3; - else - g_cpucache_up = PARTIAL_AC; - } else { - cachep->array[smp_processor_id()] = - kmalloc(sizeof(struct arraycache_init), GFP_KERNEL); - - if (g_cpucache_up == PARTIAL_AC) { - set_up_list3s(cachep, SIZE_L3); - g_cpucache_up = PARTIAL_L3; - } else { - int node; - for_each_online_node(node) { - - cachep->nodelists[node] = - kmalloc_node(sizeof - (struct kmem_list3), - GFP_KERNEL, node); - BUG_ON(!cachep->nodelists[node]); - kmem_list3_init(cachep-> - nodelists[node]); - } - } - } - cachep->nodelists[numa_node_id()]->next_reap = - jiffies + REAPTIMEOUT_LIST3 + - ((unsigned long)cachep) % REAPTIMEOUT_LIST3; - - BUG_ON(!cpu_cache_get(cachep)); - cpu_cache_get(cachep)->avail = 0; - cpu_cache_get(cachep)->limit = BOOT_CPUCACHE_ENTRIES; - cpu_cache_get(cachep)->batchcount = 1; - cpu_cache_get(cachep)->touched = 0; - cachep->batchcount = 1; - cachep->limit = BOOT_CPUCACHE_ENTRIES; + if (setup_cpu_cache(cachep)) { + __kmem_cache_destroy(cachep); + cachep = NULL; + goto oops; } /* cache setup completed, link it into the list */ list_add(&cachep->next, &cache_chain); - oops: +oops: if (!cachep && (flags & SLAB_PANIC)) panic("kmem_cache_create(): failed to create slab `%s'\n", name); mutex_unlock(&cache_chain_mutex); - unlock_cpu_hotplug(); return cachep; } EXPORT_SYMBOL(kmem_cache_create); @@ -2089,30 +2395,13 @@ static void check_spinlock_acquired_node(struct kmem_cache *cachep, int node) #define check_spinlock_acquired_node(x, y) do { } while(0) #endif -/* - * Waits for all CPUs to execute func(). - */ -static void smp_call_function_all_cpus(void (*func)(void *arg), void *arg) -{ - check_irq_on(); - preempt_disable(); - - local_irq_disable(); - func(arg); - local_irq_enable(); - - if (smp_call_function(func, arg, 1, 1)) - BUG(); - - preempt_enable(); -} - -static void drain_array_locked(struct kmem_cache *cachep, struct array_cache *ac, - int force, int node); +static void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, + struct array_cache *ac, + int force, int node); static void do_drain(void *arg) { - struct kmem_cache *cachep = (struct kmem_cache *) arg; + struct kmem_cache *cachep = arg; struct array_cache *ac; int node = numa_node_id(); @@ -2129,49 +2418,63 @@ static void drain_cpu_caches(struct kmem_cache *cachep) struct kmem_list3 *l3; int node; - smp_call_function_all_cpus(do_drain, cachep); + on_each_cpu(do_drain, cachep, 1, 1); check_irq_on(); for_each_online_node(node) { l3 = cachep->nodelists[node]; - if (l3) { - spin_lock_irq(&l3->list_lock); - drain_array_locked(cachep, l3->shared, 1, node); - spin_unlock_irq(&l3->list_lock); - if (l3->alien) - drain_alien_cache(cachep, l3->alien); - } + if (l3 && l3->alien) + drain_alien_cache(cachep, l3->alien); + } + + for_each_online_node(node) { + l3 = cachep->nodelists[node]; + if (l3) + drain_array(cachep, l3, l3->shared, 1, node); } } -static int __node_shrink(struct kmem_cache *cachep, int node) +/* + * Remove slabs from the list of free slabs. + * Specify the number of slabs to drain in tofree. + * + * Returns the actual number of slabs released. + */ +static int drain_freelist(struct kmem_cache *cache, + struct kmem_list3 *l3, int tofree) { + struct list_head *p; + int nr_freed; struct slab *slabp; - struct kmem_list3 *l3 = cachep->nodelists[node]; - int ret; - for (;;) { - struct list_head *p; + nr_freed = 0; + while (nr_freed < tofree && !list_empty(&l3->slabs_free)) { + spin_lock_irq(&l3->list_lock); p = l3->slabs_free.prev; - if (p == &l3->slabs_free) - break; + if (p == &l3->slabs_free) { + spin_unlock_irq(&l3->list_lock); + goto out; + } - slabp = list_entry(l3->slabs_free.prev, struct slab, list); + slabp = list_entry(p, struct slab, list); #if DEBUG - if (slabp->inuse) - BUG(); + BUG_ON(slabp->inuse); #endif list_del(&slabp->list); - - l3->free_objects -= cachep->num; + /* + * Safe to drop the lock. The slab is no longer linked + * to the cache. + */ + l3->free_objects -= cache->num; spin_unlock_irq(&l3->list_lock); - slab_destroy(cachep, slabp); - spin_lock_irq(&l3->list_lock); + slab_destroy(cache, slabp); + nr_freed++; } - ret = !list_empty(&l3->slabs_full) || !list_empty(&l3->slabs_partial); - return ret; +out: + return nr_freed; } +/* Called with cache_chain_mutex held to protect against cpu hotplug */ static int __cache_shrink(struct kmem_cache *cachep) { int ret = 0, i = 0; @@ -2182,11 +2485,13 @@ static int __cache_shrink(struct kmem_cache *cachep) check_irq_on(); for_each_online_node(i) { l3 = cachep->nodelists[i]; - if (l3) { - spin_lock_irq(&l3->list_lock); - ret += __node_shrink(cachep, i); - spin_unlock_irq(&l3->list_lock); - } + if (!l3) + continue; + + drain_freelist(cachep, l3, l3->free_objects); + + ret += !list_empty(&l3->slabs_full) || + !list_empty(&l3->slabs_partial); } return (ret ? 1 : 0); } @@ -2200,10 +2505,13 @@ static int __cache_shrink(struct kmem_cache *cachep) */ int kmem_cache_shrink(struct kmem_cache *cachep) { - if (!cachep || in_interrupt()) - BUG(); + int ret; + BUG_ON(!cachep || in_interrupt()); - return __cache_shrink(cachep); + mutex_lock(&cache_chain_mutex); + ret = __cache_shrink(cachep); + mutex_unlock(&cache_chain_mutex); + return ret; } EXPORT_SYMBOL(kmem_cache_shrink); @@ -2212,7 +2520,6 @@ EXPORT_SYMBOL(kmem_cache_shrink); * @cachep: the cache to destroy * * Remove a struct kmem_cache object from the slab cache. - * Returns 0 on success. * * It is expected this function will be called by a module when it is * unloaded. This will remove the cache completely, and avoid a duplicate @@ -2224,16 +2531,9 @@ EXPORT_SYMBOL(kmem_cache_shrink); * The caller must guarantee that noone will allocate memory from the cache * during the kmem_cache_destroy(). */ -int kmem_cache_destroy(struct kmem_cache *cachep) +void kmem_cache_destroy(struct kmem_cache *cachep) { - int i; - struct kmem_list3 *l3; - - if (!cachep || in_interrupt()) - BUG(); - - /* Don't let CPUs to come and go */ - lock_cpu_hotplug(); + BUG_ON(!cachep || in_interrupt()); /* Find the cache in the chain of caches. */ mutex_lock(&cache_chain_mutex); @@ -2241,48 +2541,42 @@ int kmem_cache_destroy(struct kmem_cache *cachep) * the chain is never empty, cache_cache is never destroyed */ list_del(&cachep->next); - mutex_unlock(&cache_chain_mutex); - if (__cache_shrink(cachep)) { slab_error(cachep, "Can't free all objects"); - mutex_lock(&cache_chain_mutex); list_add(&cachep->next, &cache_chain); mutex_unlock(&cache_chain_mutex); - unlock_cpu_hotplug(); - return 1; + return; } if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) synchronize_rcu(); - for_each_online_cpu(i) - kfree(cachep->array[i]); - - /* NUMA: free the list3 structures */ - for_each_online_node(i) { - if ((l3 = cachep->nodelists[i])) { - kfree(l3->shared); - free_alien_cache(l3->alien); - kfree(l3); - } - } - kmem_cache_free(&cache_cache, cachep); - - unlock_cpu_hotplug(); - - return 0; + __kmem_cache_destroy(cachep); + mutex_unlock(&cache_chain_mutex); } EXPORT_SYMBOL(kmem_cache_destroy); -/* Get the memory for a slab management obj. */ +/* + * Get the memory for a slab management obj. + * For a slab cache when the slab descriptor is off-slab, slab descriptors + * always come from malloc_sizes caches. The slab descriptor cannot + * come from the same cache which is getting created because, + * when we are searching for an appropriate cache for these + * descriptors in kmem_cache_create, we search through the malloc_sizes array. + * If we are creating a malloc_sizes cache here it would not be visible to + * kmem_find_general_cachep till the initialization is complete. + * Hence we cannot have slabp_cache same as the original cache. + */ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, - int colour_off, gfp_t local_flags) + int colour_off, gfp_t local_flags, + int nodeid) { struct slab *slabp; if (OFF_SLAB(cachep)) { /* Slab management obj is off-slab. */ - slabp = kmem_cache_alloc(cachep->slabp_cache, local_flags); + slabp = kmem_cache_alloc_node(cachep->slabp_cache, + local_flags & ~GFP_THISNODE, nodeid); if (!slabp) return NULL; } else { @@ -2292,7 +2586,7 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp, slabp->inuse = 0; slabp->colouroff = colour_off; slabp->s_mem = objp + colour_off; - + slabp->nodeid = nodeid; return slabp; } @@ -2307,7 +2601,7 @@ static void cache_init_objs(struct kmem_cache *cachep, int i; for (i = 0; i < cachep->num; i++) { - void *objp = slabp->s_mem + cachep->buffer_size * i; + void *objp = index_to_obj(cachep, slabp, i); #if DEBUG /* need to poison the objs? */ if (cachep->flags & SLAB_POISON) @@ -2320,9 +2614,9 @@ static void cache_init_objs(struct kmem_cache *cachep, *dbg_redzone2(cachep, objp) = RED_INACTIVE; } /* - * Constructors are not allowed to allocate memory from - * the same cache which they are a constructor for. - * Otherwise, deadlock. They must also be threaded. + * Constructors are not allowed to allocate memory from the same + * cache which they are a constructor for. Otherwise, deadlock. + * They must also be threaded. */ if (cachep->ctor && !(cachep->flags & SLAB_POISON)) cachep->ctor(objp + obj_offset(cachep), cachep, @@ -2336,8 +2630,8 @@ static void cache_init_objs(struct kmem_cache *cachep, slab_error(cachep, "constructor overwrote the" " start of an object"); } - if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep) - && cachep->flags & SLAB_POISON) + if ((cachep->buffer_size % PAGE_SIZE) == 0 && + OFF_SLAB(cachep) && cachep->flags & SLAB_POISON) kernel_map_pages(virt_to_page(objp), cachep->buffer_size / PAGE_SIZE, 0); #else @@ -2352,18 +2646,16 @@ static void cache_init_objs(struct kmem_cache *cachep, static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags) { - if (flags & SLAB_DMA) { - if (!(cachep->gfpflags & GFP_DMA)) - BUG(); - } else { - if (cachep->gfpflags & GFP_DMA) - BUG(); - } + if (flags & GFP_DMA) + BUG_ON(!(cachep->gfpflags & GFP_DMA)); + else + BUG_ON(cachep->gfpflags & GFP_DMA); } -static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, int nodeid) +static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, + int nodeid) { - void *objp = slabp->s_mem + (slabp->free * cachep->buffer_size); + void *objp = index_to_obj(cachep, slabp, slabp->free); kmem_bufctl_t next; slabp->inuse++; @@ -2377,18 +2669,18 @@ static void *slab_get_obj(struct kmem_cache *cachep, struct slab *slabp, int nod return objp; } -static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, void *objp, - int nodeid) +static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, + void *objp, int nodeid) { - unsigned int objnr = (unsigned)(objp-slabp->s_mem) / cachep->buffer_size; + unsigned int objnr = obj_to_index(cachep, slabp, objp); #if DEBUG /* Verify that the slab belongs to the intended node */ WARN_ON(slabp->nodeid != nodeid); - if (slab_bufctl(slabp)[objnr] != BUFCTL_FREE) { + if (slab_bufctl(slabp)[objnr] + 1 <= SLAB_LIMIT + 1) { printk(KERN_ERR "slab: double free detected in cache " - "'%s', objp %p\n", cachep->name, objp); + "'%s', objp %p\n", cachep->name, objp); BUG(); } #endif @@ -2397,44 +2689,53 @@ static void slab_put_obj(struct kmem_cache *cachep, struct slab *slabp, void *ob slabp->inuse--; } -static void set_slab_attr(struct kmem_cache *cachep, struct slab *slabp, void *objp) +/* + * Map pages beginning at addr to the given cache and slab. This is required + * for the slab allocator to be able to lookup the cache and slab of a + * virtual address for kfree, ksize, kmem_ptr_validate, and slab debugging. + */ +static void slab_map_pages(struct kmem_cache *cache, struct slab *slab, + void *addr) { - int i; + int nr_pages; struct page *page; - /* Nasty!!!!!! I hope this is OK. */ - i = 1 << cachep->gfporder; - page = virt_to_page(objp); + page = virt_to_page(addr); + + nr_pages = 1; + if (likely(!PageCompound(page))) + nr_pages <<= cache->gfporder; + do { - page_set_cache(page, cachep); - page_set_slab(page, slabp); + page_set_cache(page, cache); + page_set_slab(page, slab); page++; - } while (--i); + } while (--nr_pages); } /* * Grow (by 1) the number of slabs within a cache. This is called by * kmem_cache_alloc() when there are no active objs left in a cache. */ -static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid) +static int cache_grow(struct kmem_cache *cachep, + gfp_t flags, int nodeid, void *objp) { struct slab *slabp; - void *objp; size_t offset; gfp_t local_flags; unsigned long ctor_flags; struct kmem_list3 *l3; - /* Be lazy and only check for valid flags here, - * keeping it out of the critical path in kmem_cache_alloc(). + /* + * Be lazy and only check for valid flags here, keeping it out of the + * critical path in kmem_cache_alloc(). */ - if (flags & ~(SLAB_DMA | SLAB_LEVEL_MASK | SLAB_NO_GROW)) - BUG(); - if (flags & SLAB_NO_GROW) + BUG_ON(flags & ~(GFP_DMA | GFP_LEVEL_MASK | __GFP_NO_GROW)); + if (flags & __GFP_NO_GROW) return 0; ctor_flags = SLAB_CTOR_CONSTRUCTOR; - local_flags = (flags & SLAB_LEVEL_MASK); + local_flags = (flags & GFP_LEVEL_MASK); if (!(local_flags & __GFP_WAIT)) /* * Not allowed to sleep. Need to tell a constructor about @@ -2467,18 +2768,23 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid) */ kmem_flagcheck(cachep, flags); - /* Get mem for the objs. - * Attempt to allocate a physical page from 'nodeid', + /* + * Get mem for the objs. Attempt to allocate a physical page from + * 'nodeid'. */ - if (!(objp = kmem_getpages(cachep, flags, nodeid))) + if (!objp) + objp = kmem_getpages(cachep, flags, nodeid); + if (!objp) goto failed; /* Get slab management. */ - if (!(slabp = alloc_slabmgmt(cachep, objp, offset, local_flags))) + slabp = alloc_slabmgmt(cachep, objp, offset, + local_flags & ~GFP_THISNODE, nodeid); + if (!slabp) goto opps1; slabp->nodeid = nodeid; - set_slab_attr(cachep, slabp, objp); + slab_map_pages(cachep, slabp, objp); cache_init_objs(cachep, slabp, ctor_flags); @@ -2493,9 +2799,9 @@ static int cache_grow(struct kmem_cache *cachep, gfp_t flags, int nodeid) l3->free_objects += cachep->num; spin_unlock(&l3->list_lock); return 1; - opps1: +opps1: kmem_freepages(cachep, objp); - failed: +failed: if (local_flags & __GFP_WAIT) local_irq_disable(); return 0; @@ -2526,6 +2832,28 @@ static void kfree_debugcheck(const void *objp) } } +static inline void verify_redzone_free(struct kmem_cache *cache, void *obj) +{ + unsigned long redzone1, redzone2; + + redzone1 = *dbg_redzone1(cache, obj); + redzone2 = *dbg_redzone2(cache, obj); + + /* + * Redzone is ok. + */ + if (redzone1 == RED_ACTIVE && redzone2 == RED_ACTIVE) + return; + + if (redzone1 == RED_INACTIVE && redzone2 == RED_INACTIVE) + slab_error(cache, "double free detected"); + else + slab_error(cache, "memory outside object was overwritten"); + + printk(KERN_ERR "%p: redzone 1:0x%lx, redzone 2:0x%lx.\n", + obj, redzone1, redzone2); +} + static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, void *caller) { @@ -2537,43 +2865,26 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, kfree_debugcheck(objp); page = virt_to_page(objp); - if (page_get_cache(page) != cachep) { - printk(KERN_ERR - "mismatch in kmem_cache_free: expected cache %p, got %p\n", - page_get_cache(page), cachep); - printk(KERN_ERR "%p is %s.\n", cachep, cachep->name); - printk(KERN_ERR "%p is %s.\n", page_get_cache(page), - page_get_cache(page)->name); - WARN_ON(1); - } slabp = page_get_slab(page); if (cachep->flags & SLAB_RED_ZONE) { - if (*dbg_redzone1(cachep, objp) != RED_ACTIVE - || *dbg_redzone2(cachep, objp) != RED_ACTIVE) { - slab_error(cachep, - "double free, or memory outside" - " object was overwritten"); - printk(KERN_ERR - "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n", - objp, *dbg_redzone1(cachep, objp), - *dbg_redzone2(cachep, objp)); - } + verify_redzone_free(cachep, objp); *dbg_redzone1(cachep, objp) = RED_INACTIVE; *dbg_redzone2(cachep, objp) = RED_INACTIVE; } if (cachep->flags & SLAB_STORE_USER) *dbg_userword(cachep, objp) = caller; - objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; + objnr = obj_to_index(cachep, slabp, objp); BUG_ON(objnr >= cachep->num); - BUG_ON(objp != slabp->s_mem + objnr * cachep->buffer_size); + BUG_ON(objp != index_to_obj(cachep, slabp, objnr)); if (cachep->flags & SLAB_DEBUG_INITIAL) { - /* Need to call the slab's constructor so the - * caller can perform a verify of its state (debugging). - * Called without the cache-lock held. + /* + * Need to call the slab's constructor so the caller can + * perform a verify of its state (debugging). Called without + * the cache-lock held. */ cachep->ctor(objp + obj_offset(cachep), cachep, SLAB_CTOR_CONSTRUCTOR | SLAB_CTOR_VERIFY); @@ -2584,9 +2895,12 @@ static void *cache_free_debugcheck(struct kmem_cache *cachep, void *objp, */ cachep->dtor(objp + obj_offset(cachep), cachep, 0); } +#ifdef CONFIG_DEBUG_SLAB_LEAK + slab_bufctl(slabp)[objnr] = BUFCTL_FREE; +#endif if (cachep->flags & SLAB_POISON) { #ifdef CONFIG_DEBUG_PAGEALLOC - if ((cachep->buffer_size % PAGE_SIZE) == 0 && OFF_SLAB(cachep)) { + if ((cachep->buffer_size % PAGE_SIZE)==0 && OFF_SLAB(cachep)) { store_stackinfo(cachep, objp, (unsigned long)caller); kernel_map_pages(virt_to_page(objp), cachep->buffer_size / PAGE_SIZE, 0); @@ -2612,14 +2926,14 @@ static void check_slabp(struct kmem_cache *cachep, struct slab *slabp) goto bad; } if (entries != cachep->num - slabp->inuse) { - bad: - printk(KERN_ERR - "slab: Internal list corruption detected in cache '%s'(%d), slabp %p(%d). Hexdump:\n", - cachep->name, cachep->num, slabp, slabp->inuse); +bad: + printk(KERN_ERR "slab: Internal list corruption detected in " + "cache '%s'(%d), slabp %p(%d). Hexdump:\n", + cachep->name, cachep->num, slabp, slabp->inuse); for (i = 0; i < sizeof(*slabp) + cachep->num * sizeof(kmem_bufctl_t); i++) { - if ((i % 16) == 0) + if (i % 16 == 0) printk("\n%03x:", i); printk(" %02x", ((unsigned char *)slabp)[i]); } @@ -2638,37 +2952,31 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) int batchcount; struct kmem_list3 *l3; struct array_cache *ac; + int node; + + node = numa_node_id(); check_irq_off(); ac = cpu_cache_get(cachep); - retry: +retry: batchcount = ac->batchcount; if (!ac->touched && batchcount > BATCHREFILL_LIMIT) { - /* if there was little recent activity on this - * cache, then perform only a partial refill. - * Otherwise we could generate refill bouncing. + /* + * If there was little recent activity on this cache, then + * perform only a partial refill. Otherwise we could generate + * refill bouncing. */ batchcount = BATCHREFILL_LIMIT; } - l3 = cachep->nodelists[numa_node_id()]; + l3 = cachep->nodelists[node]; BUG_ON(ac->avail > 0 || !l3); spin_lock(&l3->list_lock); - if (l3->shared) { - struct array_cache *shared_array = l3->shared; - if (shared_array->avail) { - if (batchcount > shared_array->avail) - batchcount = shared_array->avail; - shared_array->avail -= batchcount; - ac->avail = batchcount; - memcpy(ac->entry, - &(shared_array->entry[shared_array->avail]), - sizeof(void *) * batchcount); - shared_array->touched = 1; - goto alloc_done; - } - } + /* See if we can refill from the shared array */ + if (l3->shared && transfer_objects(ac, l3->shared, batchcount)) + goto alloc_done; + while (batchcount > 0) { struct list_head *entry; struct slab *slabp; @@ -2690,7 +2998,7 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) STATS_SET_HIGH(cachep); ac->entry[ac->avail++] = slab_get_obj(cachep, slabp, - numa_node_id()); + node); } check_slabp(cachep, slabp); @@ -2702,29 +3010,29 @@ static void *cache_alloc_refill(struct kmem_cache *cachep, gfp_t flags) list_add(&slabp->list, &l3->slabs_partial); } - must_grow: +must_grow: l3->free_objects -= ac->avail; - alloc_done: +alloc_done: spin_unlock(&l3->list_lock); if (unlikely(!ac->avail)) { int x; - x = cache_grow(cachep, flags, numa_node_id()); + x = cache_grow(cachep, flags | GFP_THISNODE, node, NULL); - // cache_grow can reenable interrupts, then ac could change. + /* cache_grow can reenable interrupts, then ac could change. */ ac = cpu_cache_get(cachep); - if (!x && ac->avail == 0) // no objects in sight? abort + if (!x && ac->avail == 0) /* no objects in sight? abort */ return NULL; - if (!ac->avail) // objects refilled by interrupt? + if (!ac->avail) /* objects refilled by interrupt? */ goto retry; } ac->touched = 1; return ac->entry[--ac->avail]; } -static inline void -cache_alloc_debugcheck_before(struct kmem_cache *cachep, gfp_t flags) +static inline void cache_alloc_debugcheck_before(struct kmem_cache *cachep, + gfp_t flags) { might_sleep_if(flags & __GFP_WAIT); #if DEBUG @@ -2733,8 +3041,8 @@ cache_alloc_debugcheck_before(struct kmem_cache *cachep, gfp_t flags) } #if DEBUG -static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, gfp_t flags, - void *objp, void *caller) +static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, + gfp_t flags, void *objp, void *caller) { if (!objp) return objp; @@ -2754,19 +3062,28 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, gfp_t flags *dbg_userword(cachep, objp) = caller; if (cachep->flags & SLAB_RED_ZONE) { - if (*dbg_redzone1(cachep, objp) != RED_INACTIVE - || *dbg_redzone2(cachep, objp) != RED_INACTIVE) { - slab_error(cachep, - "double free, or memory outside" - " object was overwritten"); + if (*dbg_redzone1(cachep, objp) != RED_INACTIVE || + *dbg_redzone2(cachep, objp) != RED_INACTIVE) { + slab_error(cachep, "double free, or memory outside" + " object was overwritten"); printk(KERN_ERR - "%p: redzone 1: 0x%lx, redzone 2: 0x%lx.\n", - objp, *dbg_redzone1(cachep, objp), - *dbg_redzone2(cachep, objp)); + "%p: redzone 1:0x%lx, redzone 2:0x%lx\n", + objp, *dbg_redzone1(cachep, objp), + *dbg_redzone2(cachep, objp)); } *dbg_redzone1(cachep, objp) = RED_ACTIVE; *dbg_redzone2(cachep, objp) = RED_ACTIVE; } +#ifdef CONFIG_DEBUG_SLAB_LEAK + { + struct slab *slabp; + unsigned objnr; + + slabp = page_get_slab(virt_to_page(objp)); + objnr = (unsigned)(objp - slabp->s_mem) / cachep->buffer_size; + slab_bufctl(slabp)[objnr] = BUFCTL_ACTIVE; + } +#endif objp += obj_offset(cachep); if (cachep->ctor && cachep->flags & SLAB_POISON) { unsigned long ctor_flags = SLAB_CTOR_CONSTRUCTOR; @@ -2776,27 +3093,101 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, gfp_t flags cachep->ctor(objp, cachep, ctor_flags); } +#if ARCH_SLAB_MINALIGN + if ((u32)objp & (ARCH_SLAB_MINALIGN-1)) { + printk(KERN_ERR "0x%p: not aligned to ARCH_SLAB_MINALIGN=%d\n", + objp, ARCH_SLAB_MINALIGN); + } +#endif return objp; } #else #define cache_alloc_debugcheck_after(a,b,objp,d) (objp) #endif +#ifdef CONFIG_FAILSLAB + +static struct failslab_attr { + + struct fault_attr attr; + + u32 ignore_gfp_wait; +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + struct dentry *ignore_gfp_wait_file; +#endif + +} failslab = { + .attr = FAULT_ATTR_INITIALIZER, + .ignore_gfp_wait = 1, +}; + +static int __init setup_failslab(char *str) +{ + return setup_fault_attr(&failslab.attr, str); +} +__setup("failslab=", setup_failslab); + +static int should_failslab(struct kmem_cache *cachep, gfp_t flags) +{ + if (cachep == &cache_cache) + return 0; + if (flags & __GFP_NOFAIL) + return 0; + if (failslab.ignore_gfp_wait && (flags & __GFP_WAIT)) + return 0; + + return should_fail(&failslab.attr, obj_size(cachep)); +} + +#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS + +static int __init failslab_debugfs(void) +{ + mode_t mode = S_IFREG | S_IRUSR | S_IWUSR; + struct dentry *dir; + int err; + + err = init_fault_attr_dentries(&failslab.attr, "failslab"); + if (err) + return err; + dir = failslab.attr.dentries.dir; + + failslab.ignore_gfp_wait_file = + debugfs_create_bool("ignore-gfp-wait", mode, dir, + &failslab.ignore_gfp_wait); + + if (!failslab.ignore_gfp_wait_file) { + err = -ENOMEM; + debugfs_remove(failslab.ignore_gfp_wait_file); + cleanup_fault_attr_dentries(&failslab.attr); + } + + return err; +} + +late_initcall(failslab_debugfs); + +#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */ + +#else /* CONFIG_FAILSLAB */ + +static inline int should_failslab(struct kmem_cache *cachep, gfp_t flags) +{ + return 0; +} + +#endif /* CONFIG_FAILSLAB */ + static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) { void *objp; struct array_cache *ac; -#ifdef CONFIG_NUMA - if (unlikely(current->mempolicy && !in_interrupt())) { - int nid = slab_node(current->mempolicy); + check_irq_off(); - if (nid != numa_node_id()) - return __cache_alloc_node(cachep, flags, nid); - } -#endif + if (should_failslab(cachep, flags)) + return NULL; - check_irq_off(); ac = cpu_cache_get(cachep); if (likely(ac->avail)) { STATS_INC_ALLOCHIT(cachep); @@ -2809,16 +3200,30 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags) return objp; } -static __always_inline void * -__cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) +static __always_inline void *__cache_alloc(struct kmem_cache *cachep, + gfp_t flags, void *caller) { unsigned long save_flags; - void *objp; + void *objp = NULL; cache_alloc_debugcheck_before(cachep, flags); local_irq_save(save_flags); - objp = ____cache_alloc(cachep, flags); + + if (unlikely(NUMA_BUILD && + current->flags & (PF_SPREAD_SLAB | PF_MEMPOLICY))) + objp = alternate_node_alloc(cachep, flags); + + if (!objp) + objp = ____cache_alloc(cachep, flags); + /* + * We may just have run out of memory on the local node. + * ____cache_alloc_node() knows how to locate memory on other nodes + */ + if (NUMA_BUILD && !objp) + objp = ____cache_alloc_node(cachep, flags, numa_node_id()); + + vx_slab_alloc(cachep, flags); local_irq_restore(save_flags); objp = cache_alloc_debugcheck_after(cachep, flags, objp, caller); @@ -2827,10 +3232,102 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller) } #ifdef CONFIG_NUMA +/* + * Try allocating on another node if PF_SPREAD_SLAB|PF_MEMPOLICY. + * + * If we are in_interrupt, then process context, including cpusets and + * mempolicy, may not apply and should not be used for allocation policy. + */ +static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags) +{ + int nid_alloc, nid_here; + + if (in_interrupt() || (flags & __GFP_THISNODE)) + return NULL; + nid_alloc = nid_here = numa_node_id(); + if (cpuset_do_slab_mem_spread() && (cachep->flags & SLAB_MEM_SPREAD)) + nid_alloc = cpuset_mem_spread_node(); + else if (current->mempolicy) + nid_alloc = slab_node(current->mempolicy); + if (nid_alloc != nid_here) + return ____cache_alloc_node(cachep, flags, nid_alloc); + return NULL; +} + +/* + * Fallback function if there was no memory available and no objects on a + * certain node and fall back is permitted. First we scan all the + * available nodelists for available objects. If that fails then we + * perform an allocation without specifying a node. This allows the page + * allocator to do its reclaim / fallback magic. We then insert the + * slab into the proper nodelist and then allocate from it. + */ +void *fallback_alloc(struct kmem_cache *cache, gfp_t flags) +{ + struct zonelist *zonelist = &NODE_DATA(slab_node(current->mempolicy)) + ->node_zonelists[gfp_zone(flags)]; + struct zone **z; + void *obj = NULL; + int nid; + gfp_t local_flags = (flags & GFP_LEVEL_MASK); + +retry: + /* + * Look through allowed nodes for objects available + * from existing per node queues. + */ + for (z = zonelist->zones; *z && !obj; z++) { + nid = zone_to_nid(*z); + + if (cpuset_zone_allowed_hardwall(*z, flags) && + cache->nodelists[nid] && + cache->nodelists[nid]->free_objects) + obj = ____cache_alloc_node(cache, + flags | GFP_THISNODE, nid); + } + + if (!obj && !(flags & __GFP_NO_GROW)) { + /* + * This allocation will be performed within the constraints + * of the current cpuset / memory policy requirements. + * We may trigger various forms of reclaim on the allowed + * set and go into memory reserves if necessary. + */ + if (local_flags & __GFP_WAIT) + local_irq_enable(); + kmem_flagcheck(cache, flags); + obj = kmem_getpages(cache, flags, -1); + if (local_flags & __GFP_WAIT) + local_irq_disable(); + if (obj) { + /* + * Insert into the appropriate per node queues + */ + nid = page_to_nid(virt_to_page(obj)); + if (cache_grow(cache, flags, nid, obj)) { + obj = ____cache_alloc_node(cache, + flags | GFP_THISNODE, nid); + if (!obj) + /* + * Another processor may allocate the + * objects in the slab since we are + * not holding any locks. + */ + goto retry; + } else { + /* cache_grow already freed obj */ + obj = NULL; + } + } + } + return obj; +} + /* * A interface to enable slab creation on nodeid */ -static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) +static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, + int nodeid) { struct list_head *entry; struct slab *slabp; @@ -2841,7 +3338,7 @@ static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int node l3 = cachep->nodelists[nodeid]; BUG_ON(!l3); - retry: +retry: check_irq_off(); spin_lock(&l3->list_lock); entry = l3->slabs_partial.next; @@ -2864,28 +3361,32 @@ static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int node obj = slab_get_obj(cachep, slabp, nodeid); check_slabp(cachep, slabp); + vx_slab_alloc(cachep, flags); l3->free_objects--; /* move slabp to correct slabp list: */ list_del(&slabp->list); - if (slabp->free == BUFCTL_END) { + if (slabp->free == BUFCTL_END) list_add(&slabp->list, &l3->slabs_full); - } else { + else list_add(&slabp->list, &l3->slabs_partial); - } spin_unlock(&l3->list_lock); goto done; - must_grow: +must_grow: spin_unlock(&l3->list_lock); - x = cache_grow(cachep, flags, nodeid); + x = cache_grow(cachep, flags | GFP_THISNODE, nodeid, NULL); + if (x) + goto retry; - if (!x) - return NULL; + if (!(flags & __GFP_THISNODE)) + /* Unable to grow the cache. Fall back to other nodes. */ + return fallback_alloc(cachep, flags); + + return NULL; - goto retry; - done: +done: return obj; } #endif @@ -2917,6 +3418,12 @@ static void free_block(struct kmem_cache *cachep, void **objpp, int nr_objects, if (slabp->inuse == 0) { if (l3->free_objects > l3->free_limit) { l3->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, slabp); } else { list_add(&slabp->list, &l3->slabs_free); @@ -2958,7 +3465,7 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) } free_block(cachep, ac->entry, batchcount, node); - free_done: +free_done: #if STATS { int i = 0; @@ -2979,16 +3486,12 @@ static void cache_flusharray(struct kmem_cache *cachep, struct array_cache *ac) #endif spin_unlock(&l3->list_lock); ac->avail -= batchcount; - memmove(ac->entry, &(ac->entry[batchcount]), - sizeof(void *) * ac->avail); + memmove(ac->entry, &(ac->entry[batchcount]), sizeof(void *)*ac->avail); } /* - * __cache_free - * Release an obj back to its cache. If the obj has a constructed - * state, it must be in this state _before_ it is released. - * - * Called with disabled ints. + * Release an obj back to its cache. If the obj has a constructed state, it must + * be in this state _before_ it is released. Called with disabled ints. */ static inline void __cache_free(struct kmem_cache *cachep, void *objp) { @@ -2996,40 +3499,11 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp) check_irq_off(); objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0)); + vx_slab_free(cachep); + + if (cache_free_alien(cachep, objp)) + return; - /* Make sure we are not freeing a object from another - * node to the array cache on this cpu. - */ -#ifdef CONFIG_NUMA - { - struct slab *slabp; - slabp = virt_to_slab(objp); - if (unlikely(slabp->nodeid != numa_node_id())) { - struct array_cache *alien = NULL; - int nodeid = slabp->nodeid; - struct kmem_list3 *l3 = - cachep->nodelists[numa_node_id()]; - - STATS_INC_NODEFREES(cachep); - if (l3->alien && l3->alien[nodeid]) { - alien = l3->alien[nodeid]; - spin_lock(&alien->lock); - if (unlikely(alien->avail == alien->limit)) - __drain_alien_cache(cachep, - alien, nodeid); - alien->entry[alien->avail++] = objp; - spin_unlock(&alien->lock); - } else { - spin_lock(&(cachep->nodelists[nodeid])-> - list_lock); - free_block(cachep, &objp, 1, nodeid); - spin_unlock(&(cachep->nodelists[nodeid])-> - list_lock); - } - return; - } - } -#endif if (likely(ac->avail < ac->limit)) { STATS_INC_FREEHIT(cachep); ac->entry[ac->avail++] = objp; @@ -3055,6 +3529,23 @@ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) } EXPORT_SYMBOL(kmem_cache_alloc); +/** + * kmem_cache_zalloc - Allocate an object. The memory is set to zero. + * @cache: The cache to allocate from. + * @flags: See kmalloc(). + * + * Allocate an object from this cache and set the allocated memory to zero. + * The flags are only relevant if the cache has no available objects. + */ +void *kmem_cache_zalloc(struct kmem_cache *cache, gfp_t flags) +{ + void *ret = __cache_alloc(cache, flags, __builtin_return_address(0)); + if (ret) + memset(ret, 0, obj_size(cache)); + return ret; +} +EXPORT_SYMBOL(kmem_cache_zalloc); + /** * kmem_ptr_validate - check if an untrusted pointer might * be a slab entry. @@ -3069,7 +3560,7 @@ EXPORT_SYMBOL(kmem_cache_alloc); * * Currently only used for dentry validation. */ -int fastcall kmem_ptr_validate(struct kmem_cache *cachep, void *ptr) +int kmem_ptr_validate(struct kmem_cache *cachep, const void *ptr) { unsigned long addr = (unsigned long)ptr; unsigned long min_addr = PAGE_OFFSET; @@ -3093,7 +3584,7 @@ int fastcall kmem_ptr_validate(struct kmem_cache *cachep, void *ptr) if (unlikely(page_get_cache(page) != cachep)) goto out; return 1; - out: +out: return 0; } @@ -3103,36 +3594,61 @@ int fastcall kmem_ptr_validate(struct kmem_cache *cachep, void *ptr) * @cachep: The cache to allocate from. * @flags: See kmalloc(). * @nodeid: node number of the target node. + * @caller: return address of caller, used for debug information + * + * Identical to kmem_cache_alloc but it will allocate memory on the given + * node, which can improve the performance for cpu bound structures. * - * Identical to kmem_cache_alloc, except that this function is slow - * and can sleep. And it will allocate memory on the given node, which - * can improve the performance for cpu bound structures. - * New and improved: it will now make sure that the object gets - * put on the correct node list so that there is no false sharing. + * Fallback to other node is possible if __GFP_THISNODE is not set. */ -void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) +static __always_inline void * +__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, + int nodeid, void *caller) { unsigned long save_flags; - void *ptr; + void *ptr = NULL; cache_alloc_debugcheck_before(cachep, flags); local_irq_save(save_flags); - if (nodeid == -1 || nodeid == numa_node_id() || - !cachep->nodelists[nodeid]) - ptr = ____cache_alloc(cachep, flags); - else - ptr = __cache_alloc_node(cachep, flags, nodeid); - local_irq_restore(save_flags); + if (unlikely(nodeid == -1)) + nodeid = numa_node_id(); - ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, - __builtin_return_address(0)); + if (likely(cachep->nodelists[nodeid])) { + if (nodeid == numa_node_id()) { + /* + * Use the locally cached objects if possible. + * However ____cache_alloc does not allow fallback + * to other nodes. It may fail while we still have + * objects on other nodes available. + */ + ptr = ____cache_alloc(cachep, flags); + } + if (!ptr) { + /* ___cache_alloc_node can fall back to other nodes */ + ptr = ____cache_alloc_node(cachep, flags, nodeid); + } + } else { + /* Node not bootstrapped yet */ + if (!(flags & __GFP_THISNODE)) + ptr = fallback_alloc(cachep, flags); + } + + local_irq_restore(save_flags); + ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller); return ptr; } + +void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) +{ + return __cache_alloc_node(cachep, flags, nodeid, + __builtin_return_address(0)); +} EXPORT_SYMBOL(kmem_cache_alloc_node); -void *kmalloc_node(size_t size, gfp_t flags, int node) +static __always_inline void * +__do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller) { struct kmem_cache *cachep; @@ -3141,29 +3657,35 @@ void *kmalloc_node(size_t size, gfp_t flags, int node) return NULL; return kmem_cache_alloc_node(cachep, flags, node); } -EXPORT_SYMBOL(kmalloc_node); -#endif + +#ifdef CONFIG_DEBUG_SLAB +void *__kmalloc_node(size_t size, gfp_t flags, int node) +{ + return __do_kmalloc_node(size, flags, node, + __builtin_return_address(0)); +} +EXPORT_SYMBOL(__kmalloc_node); + +void *__kmalloc_node_track_caller(size_t size, gfp_t flags, + int node, void *caller) +{ + 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, NULL); +} +EXPORT_SYMBOL(__kmalloc_node); +#endif /* CONFIG_DEBUG_SLAB */ +#endif /* CONFIG_NUMA */ /** - * kmalloc - allocate memory + * __do_kmalloc - allocate memory * @size: how many bytes of memory are required. - * @flags: the type of memory to allocate. - * - * kmalloc is the normal method of allocating memory - * in the kernel. - * - * The @flags argument may be one of: - * - * %GFP_USER - Allocate memory on behalf of user. May sleep. - * - * %GFP_KERNEL - Allocate normal kernel ram. May sleep. - * - * %GFP_ATOMIC - Allocation will not sleep. Use inside interrupt handlers. - * - * Additionally, the %GFP_DMA flag may be set to indicate the memory - * must be suitable for DMA. This can mean different things on different - * platforms. For example, on i386, it means that the memory must come - * from the first 16MB. + * @flags: the type of memory to allocate (see kmalloc). + * @caller: function caller for debug tracking of the caller */ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, void *caller) @@ -3181,71 +3703,26 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, return __cache_alloc(cachep, flags, caller); } -#ifndef CONFIG_DEBUG_SLAB +#ifdef CONFIG_DEBUG_SLAB void *__kmalloc(size_t size, gfp_t flags) { - return __do_kmalloc(size, flags, NULL); + return __do_kmalloc(size, flags, __builtin_return_address(0)); } EXPORT_SYMBOL(__kmalloc); -#else - void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) { return __do_kmalloc(size, flags, caller); } EXPORT_SYMBOL(__kmalloc_track_caller); -#endif - -#ifdef CONFIG_SMP -/** - * __alloc_percpu - allocate one copy of the object for every present - * cpu in the system, zeroing them. - * Objects should be dereferenced using the per_cpu_ptr macro only. - * - * @size: how many bytes of memory are required. - */ -void *__alloc_percpu(size_t size) +#else +void *__kmalloc(size_t size, gfp_t flags) { - int i; - struct percpu_data *pdata = kmalloc(sizeof(*pdata), GFP_KERNEL); - - if (!pdata) - return NULL; - - /* - * Cannot use for_each_online_cpu since a cpu may come online - * and we have no way of figuring out how to fix the array - * that we have allocated then.... - */ - for_each_cpu(i) { - int node = cpu_to_node(i); - - if (node_online(node)) - pdata->ptrs[i] = kmalloc_node(size, GFP_KERNEL, node); - else - pdata->ptrs[i] = kmalloc(size, GFP_KERNEL); - - if (!pdata->ptrs[i]) - goto unwind_oom; - memset(pdata->ptrs[i], 0, size); - } - - /* Catch derefs w/o wrappers */ - return (void *)(~(unsigned long)pdata); - - unwind_oom: - while (--i >= 0) { - if (!cpu_possible(i)) - continue; - kfree(pdata->ptrs[i]); - } - kfree(pdata); - return NULL; + return __do_kmalloc(size, flags, NULL); } -EXPORT_SYMBOL(__alloc_percpu); +EXPORT_SYMBOL(__kmalloc); #endif /** @@ -3260,6 +3737,8 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp) { unsigned long flags; + BUG_ON(virt_to_cache(objp) != cachep); + local_irq_save(flags); __cache_free(cachep, objp); local_irq_restore(flags); @@ -3285,35 +3764,12 @@ void kfree(const void *objp) local_irq_save(flags); kfree_debugcheck(objp); c = virt_to_cache(objp); - mutex_debug_check_no_locks_freed(objp, obj_size(c)); + debug_check_no_locks_freed(objp, obj_size(c)); __cache_free(c, (void *)objp); local_irq_restore(flags); } EXPORT_SYMBOL(kfree); -#ifdef CONFIG_SMP -/** - * free_percpu - free previously allocated percpu memory - * @objp: pointer returned by alloc_percpu. - * - * Don't free memory not originally allocated by alloc_percpu() - * The complemented objp is to check for that. - */ -void free_percpu(const void *objp) -{ - int i; - struct percpu_data *p = (struct percpu_data *)(~(unsigned long)objp); - - /* - * We allocate for all cpus so we cannot use for online cpu here. - */ - for_each_cpu(i) - kfree(p->ptrs[i]); - kfree(p); -} -EXPORT_SYMBOL(free_percpu); -#endif - unsigned int kmem_cache_size(struct kmem_cache *cachep) { return obj_size(cachep); @@ -3327,61 +3783,88 @@ const char *kmem_cache_name(struct kmem_cache *cachep) EXPORT_SYMBOL_GPL(kmem_cache_name); /* - * This initializes kmem_list3 for all nodes. + * This initializes kmem_list3 or resizes varioius caches for all nodes. */ static int alloc_kmemlist(struct kmem_cache *cachep) { int node; struct kmem_list3 *l3; - int err = 0; + struct array_cache *new_shared; + struct array_cache **new_alien = NULL; for_each_online_node(node) { - struct array_cache *nc = NULL, *new; - struct array_cache **new_alien = NULL; -#ifdef CONFIG_NUMA - if (!(new_alien = alloc_alien_cache(node, cachep->limit))) - goto fail; -#endif - if (!(new = alloc_arraycache(node, (cachep->shared * - cachep->batchcount), - 0xbaadf00d))) + + if (use_alien_caches) { + new_alien = alloc_alien_cache(node, cachep->limit); + if (!new_alien) + goto fail; + } + + new_shared = alloc_arraycache(node, + cachep->shared*cachep->batchcount, + 0xbaadf00d); + if (!new_shared) { + free_alien_cache(new_alien); goto fail; - if ((l3 = cachep->nodelists[node])) { + } + + l3 = cachep->nodelists[node]; + if (l3) { + struct array_cache *shared = l3->shared; spin_lock_irq(&l3->list_lock); - if ((nc = cachep->nodelists[node]->shared)) - free_block(cachep, nc->entry, nc->avail, node); + if (shared) + free_block(cachep, shared->entry, + shared->avail, node); - l3->shared = new; - if (!cachep->nodelists[node]->alien) { + l3->shared = new_shared; + if (!l3->alien) { l3->alien = new_alien; new_alien = NULL; } l3->free_limit = (1 + nr_cpus_node(node)) * - cachep->batchcount + cachep->num; + cachep->batchcount + cachep->num; spin_unlock_irq(&l3->list_lock); - kfree(nc); + kfree(shared); free_alien_cache(new_alien); continue; } - if (!(l3 = kmalloc_node(sizeof(struct kmem_list3), - GFP_KERNEL, node))) + l3 = kmalloc_node(sizeof(struct kmem_list3), GFP_KERNEL, node); + if (!l3) { + free_alien_cache(new_alien); + kfree(new_shared); goto fail; + } kmem_list3_init(l3); l3->next_reap = jiffies + REAPTIMEOUT_LIST3 + - ((unsigned long)cachep) % REAPTIMEOUT_LIST3; - l3->shared = new; + ((unsigned long)cachep) % REAPTIMEOUT_LIST3; + l3->shared = new_shared; l3->alien = new_alien; l3->free_limit = (1 + nr_cpus_node(node)) * - cachep->batchcount + cachep->num; + cachep->batchcount + cachep->num; cachep->nodelists[node] = l3; } - return err; - fail: - err = -ENOMEM; - return err; + return 0; + +fail: + if (!cachep->next.next) { + /* Cache is not active yet. Roll back what we did */ + node--; + while (node >= 0) { + if (cachep->nodelists[node]) { + l3 = cachep->nodelists[node]; + + kfree(l3->shared); + free_alien_cache(l3->alien); + kfree(l3); + cachep->nodelists[node] = NULL; + } + node--; + } + } + return -ENOMEM; } struct ccupdate_struct { @@ -3391,7 +3874,7 @@ struct ccupdate_struct { static void do_ccupdate_local(void *info) { - struct ccupdate_struct *new = (struct ccupdate_struct *)info; + struct ccupdate_struct *new = info; struct array_cache *old; check_irq_off(); @@ -3401,35 +3884,38 @@ static void do_ccupdate_local(void *info) new->new[smp_processor_id()] = old; } -static int do_tune_cpucache(struct kmem_cache *cachep, int limit, int batchcount, - int shared) +/* Always called with the cache_chain_mutex held */ +static int do_tune_cpucache(struct kmem_cache *cachep, int limit, + int batchcount, int shared) { - struct ccupdate_struct new; - int i, err; + struct ccupdate_struct *new; + int i; + + new = kzalloc(sizeof(*new), GFP_KERNEL); + if (!new) + return -ENOMEM; - memset(&new.new, 0, sizeof(new.new)); for_each_online_cpu(i) { - new.new[i] = - alloc_arraycache(cpu_to_node(i), limit, batchcount); - if (!new.new[i]) { + new->new[i] = alloc_arraycache(cpu_to_node(i), limit, + batchcount); + if (!new->new[i]) { for (i--; i >= 0; i--) - kfree(new.new[i]); + kfree(new->new[i]); + kfree(new); return -ENOMEM; } } - new.cachep = cachep; + new->cachep = cachep; - smp_call_function_all_cpus(do_ccupdate_local, (void *)&new); + on_each_cpu(do_ccupdate_local, (void *)new, 1, 1); check_irq_on(); - spin_lock(&cachep->spinlock); cachep->batchcount = batchcount; cachep->limit = limit; cachep->shared = shared; - spin_unlock(&cachep->spinlock); for_each_online_cpu(i) { - struct array_cache *ccold = new.new[i]; + struct array_cache *ccold = new->new[i]; if (!ccold) continue; spin_lock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); @@ -3437,25 +3923,21 @@ static int do_tune_cpucache(struct kmem_cache *cachep, int limit, int batchcount spin_unlock_irq(&cachep->nodelists[cpu_to_node(i)]->list_lock); kfree(ccold); } - - err = alloc_kmemlist(cachep); - if (err) { - printk(KERN_ERR "alloc_kmemlist failed for %s, error %d.\n", - cachep->name, -err); - BUG(); - } - return 0; + kfree(new); + return alloc_kmemlist(cachep); } -static void enable_cpucache(struct kmem_cache *cachep) +/* Called with cache_chain_mutex held always */ +static int enable_cpucache(struct kmem_cache *cachep) { int err; int limit, shared; - /* The head array serves three purposes: + /* + * The head array serves three purposes: * - create a LIFO ordering, i.e. return objects that are cache-warm * - reduce the number of spinlock operations. - * - reduce the number of linked list operations on the slab and + * - reduce the number of linked list operations on the slab and * bufctl chains: array operations are cheaper. * The numbers are guessed, we should auto-tune as described by * Bonwick. @@ -3471,7 +3953,8 @@ static void enable_cpucache(struct kmem_cache *cachep) else limit = 120; - /* Cpu bound tasks (e.g. network routing) can exhibit cpu bound + /* + * CPU bound tasks (e.g. network routing) can exhibit cpu bound * allocation behaviour: Most allocs on one cpu, most free operations * on another cpu. For these cases, an efficient object passing between * cpus is necessary. This is provided by a shared array. The array @@ -3486,9 +3969,9 @@ static void enable_cpucache(struct kmem_cache *cachep) #endif #if DEBUG - /* With debugging enabled, large batchcount lead to excessively - * long periods with disabled local interrupts. Limit the - * batchcount + /* + * With debugging enabled, large batchcount lead to excessively long + * periods with disabled local interrupts. Limit the batchcount */ if (limit > 32) limit = 32; @@ -3497,25 +3980,35 @@ static void enable_cpucache(struct kmem_cache *cachep) if (err) printk(KERN_ERR "enable_cpucache failed for %s, error %d.\n", cachep->name, -err); + return err; } -static void drain_array_locked(struct kmem_cache *cachep, struct array_cache *ac, - int force, int node) +/* + * Drain an array if it contains any elements taking the l3 lock only if + * necessary. Note that the l3 listlock also protects the array_cache + * if drain_array() is used on the shared array. + */ +void drain_array(struct kmem_cache *cachep, struct kmem_list3 *l3, + struct array_cache *ac, int force, int node) { int tofree; - check_spinlock_acquired_node(cachep, node); + if (!ac || !ac->avail) + return; if (ac->touched && !force) { ac->touched = 0; - } else if (ac->avail) { - tofree = force ? ac->avail : (ac->limit + 4) / 5; - if (tofree > ac->avail) { - tofree = (ac->avail + 1) / 2; + } else { + spin_lock_irq(&l3->list_lock); + if (ac->avail) { + tofree = force ? ac->avail : (ac->limit + 4) / 5; + if (tofree > ac->avail) + tofree = (ac->avail + 1) / 2; + free_block(cachep, ac->entry, tofree, node); + ac->avail -= tofree; + memmove(ac->entry, &(ac->entry[tofree]), + sizeof(void *) * ac->avail); } - free_block(cachep, ac->entry, tofree, node); - ac->avail -= tofree; - memmove(ac->entry, &(ac->entry[tofree]), - sizeof(void *) * ac->avail); + spin_unlock_irq(&l3->list_lock); } } @@ -3528,88 +4021,66 @@ static void drain_array_locked(struct kmem_cache *cachep, struct array_cache *ac * - clear the per-cpu caches for this CPU. * - return freeable pages to the main free memory pool. * - * If we cannot acquire the cache chain mutex then just give up - we'll - * try again on the next iteration. + * If we cannot acquire the cache chain mutex then just give up - we'll try + * again on the next iteration. */ -static void cache_reap(void *unused) +static void cache_reap(struct work_struct *unused) { - struct list_head *walk; + struct kmem_cache *searchp; struct kmem_list3 *l3; + int node = numa_node_id(); if (!mutex_trylock(&cache_chain_mutex)) { /* Give up. Setup the next iteration. */ schedule_delayed_work(&__get_cpu_var(reap_work), - REAPTIMEOUT_CPUC); + round_jiffies_relative(REAPTIMEOUT_CPUC)); return; } - list_for_each(walk, &cache_chain) { - struct kmem_cache *searchp; - struct list_head *p; - int tofree; - struct slab *slabp; - - searchp = list_entry(walk, struct kmem_cache, next); - - if (searchp->flags & SLAB_NO_REAP) - goto next; - + list_for_each_entry(searchp, &cache_chain, next) { check_irq_on(); - l3 = searchp->nodelists[numa_node_id()]; + /* + * We only take the l3 lock if absolutely necessary and we + * have established with reasonable certainty that + * we can do some work if the lock was obtained. + */ + l3 = searchp->nodelists[node]; + reap_alien(searchp, l3); - spin_lock_irq(&l3->list_lock); - drain_array_locked(searchp, cpu_cache_get(searchp), 0, - numa_node_id()); + drain_array(searchp, l3, cpu_cache_get(searchp), 0, node); + /* + * These are racy checks but it does not matter + * if we skip one check or scan twice. + */ if (time_after(l3->next_reap, jiffies)) - goto next_unlock; + goto next; l3->next_reap = jiffies + REAPTIMEOUT_LIST3; - if (l3->shared) - drain_array_locked(searchp, l3->shared, 0, - numa_node_id()); + drain_array(searchp, l3, l3->shared, 0, node); - if (l3->free_touched) { + if (l3->free_touched) l3->free_touched = 0; - goto next_unlock; - } - - tofree = - (l3->free_limit + 5 * searchp->num - - 1) / (5 * searchp->num); - do { - p = l3->slabs_free.next; - if (p == &(l3->slabs_free)) - break; - - slabp = list_entry(p, struct slab, list); - BUG_ON(slabp->inuse); - list_del(&slabp->list); - STATS_INC_REAPED(searchp); + else { + int freed; - /* Safe to drop the lock. The slab is no longer - * linked to the cache. - * searchp cannot disappear, we hold - * cache_chain_lock - */ - l3->free_objects -= searchp->num; - spin_unlock_irq(&l3->list_lock); - slab_destroy(searchp, slabp); - spin_lock_irq(&l3->list_lock); - } while (--tofree > 0); - next_unlock: - spin_unlock_irq(&l3->list_lock); - next: + freed = drain_freelist(searchp, l3, (l3->free_limit + + 5 * searchp->num - 1) / (5 * searchp->num)); + STATS_ADD_REAPED(searchp, freed); + } +next: cond_resched(); } check_irq_on(); mutex_unlock(&cache_chain_mutex); next_reap_node(); - /* Setup the next iteration */ - schedule_delayed_work(&__get_cpu_var(reap_work), REAPTIMEOUT_CPUC); + refresh_cpu_vm_stats(smp_processor_id()); + /* Set up the next iteration */ + schedule_delayed_work(&__get_cpu_var(reap_work), + round_jiffies_relative(REAPTIMEOUT_CPUC)); } #ifdef CONFIG_PROC_FS @@ -3631,7 +4102,7 @@ static void print_slabinfo_header(struct seq_file *m) seq_puts(m, " : slabdata "); #if STATS seq_puts(m, " : globalstat " - " "); + " "); seq_puts(m, " : cpustat "); #endif seq_putc(m, '\n'); @@ -3658,8 +4129,8 @@ static void *s_next(struct seq_file *m, void *p, loff_t *pos) { struct kmem_cache *cachep = p; ++*pos; - return cachep->next.next == &cache_chain ? NULL - : list_entry(cachep->next.next, struct kmem_cache, next); + return cachep->next.next == &cache_chain ? + NULL : list_entry(cachep->next.next, struct kmem_cache, next); } static void s_stop(struct seq_file *m, void *p) @@ -3670,7 +4141,6 @@ static void s_stop(struct seq_file *m, void *p) static int s_show(struct seq_file *m, void *p) { struct kmem_cache *cachep = p; - struct list_head *q; struct slab *slabp; unsigned long active_objs; unsigned long num_objs; @@ -3681,7 +4151,6 @@ static int s_show(struct seq_file *m, void *p) int node; struct kmem_list3 *l3; - spin_lock(&cachep->spinlock); active_objs = 0; num_slabs = 0; for_each_online_node(node) { @@ -3692,15 +4161,13 @@ static int s_show(struct seq_file *m, void *p) check_irq_on(); spin_lock_irq(&l3->list_lock); - list_for_each(q, &l3->slabs_full) { - slabp = list_entry(q, struct slab, list); + list_for_each_entry(slabp, &l3->slabs_full, list) { if (slabp->inuse != cachep->num && !error) error = "slabs_full accounting error"; active_objs += cachep->num; active_slabs++; } - list_for_each(q, &l3->slabs_partial) { - slabp = list_entry(q, struct slab, list); + list_for_each_entry(slabp, &l3->slabs_partial, list) { if (slabp->inuse == cachep->num && !error) error = "slabs_partial inuse accounting error"; if (!slabp->inuse && !error) @@ -3708,8 +4175,7 @@ static int s_show(struct seq_file *m, void *p) active_objs += slabp->inuse; active_slabs++; } - list_for_each(q, &l3->slabs_free) { - slabp = list_entry(q, struct slab, list); + list_for_each_entry(slabp, &l3->slabs_free, list) { if (slabp->inuse && !error) error = "slabs_free/inuse accounting error"; num_slabs++; @@ -3746,9 +4212,12 @@ static int s_show(struct seq_file *m, void *p) unsigned long max_freeable = cachep->max_freeable; unsigned long node_allocs = cachep->node_allocs; unsigned long node_frees = cachep->node_frees; + unsigned long overflows = cachep->node_overflow; seq_printf(m, " : globalstat %7lu %6lu %5lu %4lu \ - %4lu %4lu %4lu %4lu", allocs, high, grown, reaped, errors, max_freeable, node_allocs, node_frees); + %4lu %4lu %4lu %4lu %4lu", allocs, high, grown, + reaped, errors, max_freeable, node_allocs, + node_frees, overflows); } /* cpu stats */ { @@ -3762,7 +4231,6 @@ static int s_show(struct seq_file *m, void *p) } #endif seq_putc(m, '\n'); - spin_unlock(&cachep->spinlock); return 0; } @@ -3780,7 +4248,7 @@ static int s_show(struct seq_file *m, void *p) * + further values on SMP and with statistics enabled */ -struct seq_operations slabinfo_op = { +const struct seq_operations slabinfo_op = { .start = s_start, .next = s_next, .stop = s_stop, @@ -3800,7 +4268,7 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer, { char kbuf[MAX_SLABINFO_WRITE + 1], *tmp; int limit, batchcount, shared, res; - struct list_head *p; + struct kmem_cache *cachep; if (count > MAX_SLABINFO_WRITE) return -EINVAL; @@ -3819,14 +4287,10 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer, /* Find the cache in the chain of caches. */ mutex_lock(&cache_chain_mutex); res = -EINVAL; - list_for_each(p, &cache_chain) { - struct kmem_cache *cachep = list_entry(p, struct kmem_cache, - next); - + list_for_each_entry(cachep, &cache_chain, next) { if (!strcmp(cachep->name, kbuf)) { - if (limit < 1 || - batchcount < 1 || - batchcount > limit || shared < 0) { + if (limit < 1 || batchcount < 1 || + batchcount > limit || shared < 0) { res = 0; } else { res = do_tune_cpucache(cachep, limit, @@ -3840,6 +4304,155 @@ ssize_t slabinfo_write(struct file *file, const char __user * buffer, res = count; return res; } + +#ifdef CONFIG_DEBUG_SLAB_LEAK + +static void *leaks_start(struct seq_file *m, loff_t *pos) +{ + loff_t n = *pos; + struct list_head *p; + + mutex_lock(&cache_chain_mutex); + p = cache_chain.next; + while (n--) { + p = p->next; + if (p == &cache_chain) + return NULL; + } + return list_entry(p, struct kmem_cache, next); +} + +static inline int add_caller(unsigned long *n, unsigned long v) +{ + unsigned long *p; + int l; + if (!v) + return 1; + l = n[1]; + p = n + 2; + while (l) { + int i = l/2; + unsigned long *q = p + 2 * i; + if (*q == v) { + q[1]++; + return 1; + } + if (*q > v) { + l = i; + } else { + p = q + 2; + l -= i + 1; + } + } + if (++n[1] == n[0]) + return 0; + memmove(p + 2, p, n[1] * 2 * sizeof(unsigned long) - ((void *)p - (void *)n)); + p[0] = v; + p[1] = 1; + return 1; +} + +static void handle_slab(unsigned long *n, struct kmem_cache *c, struct slab *s) +{ + void *p; + int i; + if (n[0] == n[1]) + return; + for (i = 0, p = s->s_mem; i < c->num; i++, p += c->buffer_size) { + if (slab_bufctl(s)[i] != BUFCTL_ACTIVE) + continue; + if (!add_caller(n, (unsigned long)*dbg_userword(c, p))) + return; + } +} + +static void show_symbol(struct seq_file *m, unsigned long address) +{ +#ifdef CONFIG_KALLSYMS + char *modname; + const char *name; + unsigned long offset, size; + char namebuf[KSYM_NAME_LEN+1]; + + name = kallsyms_lookup(address, &size, &offset, &modname, namebuf); + + if (name) { + seq_printf(m, "%s+%#lx/%#lx", name, offset, size); + if (modname) + seq_printf(m, " [%s]", modname); + return; + } +#endif + seq_printf(m, "%p", (void *)address); +} + +static int leaks_show(struct seq_file *m, void *p) +{ + struct kmem_cache *cachep = p; + struct slab *slabp; + struct kmem_list3 *l3; + const char *name; + unsigned long *n = m->private; + int node; + int i; + + if (!(cachep->flags & SLAB_STORE_USER)) + return 0; + if (!(cachep->flags & SLAB_RED_ZONE)) + return 0; + + /* OK, we can do it */ + + n[1] = 0; + + for_each_online_node(node) { + l3 = cachep->nodelists[node]; + if (!l3) + continue; + + check_irq_on(); + spin_lock_irq(&l3->list_lock); + + list_for_each_entry(slabp, &l3->slabs_full, list) + handle_slab(n, cachep, slabp); + list_for_each_entry(slabp, &l3->slabs_partial, list) + handle_slab(n, cachep, slabp); + spin_unlock_irq(&l3->list_lock); + } + name = cachep->name; + if (n[0] == n[1]) { + /* Increase the buffer size */ + mutex_unlock(&cache_chain_mutex); + m->private = kzalloc(n[0] * 4 * sizeof(unsigned long), GFP_KERNEL); + if (!m->private) { + /* Too bad, we are really out */ + m->private = n; + mutex_lock(&cache_chain_mutex); + return -ENOMEM; + } + *(unsigned long *)m->private = n[0] * 2; + kfree(n); + mutex_lock(&cache_chain_mutex); + /* Now make sure this entry will be retried */ + m->count = m->size; + return 0; + } + for (i = 0; i < n[1]; i++) { + seq_printf(m, "%s: %lu ", name, n[2*i+3]); + show_symbol(m, n[2*i+2]); + seq_putc(m, '\n'); + } + + return 0; +} + +const struct seq_operations slabstats_op = { + .start = leaks_start, + .next = s_next, + .stop = s_stop, + .show = leaks_show, +}; +#endif #endif /**