From 79576102afc24fcc6627d7a15691e432d9a2eacb Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:06:14 +0000 Subject: mm/slub: Add debugging to verify correct cache use on kmem_cache_free() Add additional debugging to check that the objects is actually from the cache the caller claims. Doing so currently trips up some other debugging code. It takes a lot to infer from that what was happening. Reviewed-by: Glauber Costa Signed-off-by: Christoph Lameter [ penberg@kernel.org: Use pr_err() ] Signed-off-by: Pekka Enberg --- mm/slub.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index c67bd0a4a952..990592174340 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2614,6 +2614,13 @@ void kmem_cache_free(struct kmem_cache *s, void *x) page = virt_to_head_page(x); + if (kmem_cache_debug(s) && page->slab != s) { + pr_err("kmem_cache_free: Wrong slab cache. %s but object" + " is from %s\n", page->slab->name, s->name); + WARN_ON_ONCE(1); + return; + } + slab_free(s, page, x, _RET_IP_); trace_kmem_cache_free(_RET_IP_, x); -- cgit v1.2.3-58-ga151 From 208c4358dc4a8f0fe99e49eb8d21a869b01e7d34 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:06:14 +0000 Subject: mm/slub: Use kmem_cache for the kmem_cache structure Do not use kmalloc() but kmem_cache_alloc() for the allocation of the kmem_cache structures in slub. Reviewed-by: Glauber Costa Acked-by: David Rientjes Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/mm/slub.c b/mm/slub.c index 990592174340..c66908983218 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -213,7 +213,7 @@ static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) static inline void sysfs_slab_remove(struct kmem_cache *s) { kfree(s->name); - kfree(s); + kmem_cache_free(kmem_cache, s); } #endif @@ -3969,7 +3969,7 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, if (!n) return NULL; - s = kmalloc(kmem_size, GFP_KERNEL); + s = kmem_cache_alloc(kmem_cache, GFP_KERNEL); if (s) { if (kmem_cache_open(s, n, size, align, flags, ctor)) { @@ -3986,7 +3986,7 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, list_del(&s->list); kmem_cache_close(s); } - kfree(s); + kmem_cache_free(kmem_cache, s); } kfree(n); return NULL; @@ -5224,7 +5224,7 @@ static void kmem_cache_release(struct kobject *kobj) struct kmem_cache *s = to_slab(kobj); kfree(s->name); - kfree(s); + kmem_cache_free(kmem_cache, s); } static const struct sysfs_ops slab_sysfs_ops = { -- cgit v1.2.3-58-ga151 From 686d550d222e8f83f6e709debbedf9d8ef77aec7 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:20:33 +0000 Subject: mm/slab_common: Improve error handling in kmem_cache_create Instead of using s == NULL use an errorcode. This allows much more detailed diagnostics as to what went wrong. As we add more functionality from the slab allocators to the common kmem_cache_create() function we will also add more error conditions. Print the error code during the panic as well as in a warning if the module can handle failure. The API for kmem_cache_create() currently does not allow the returning of an error code. Return NULL but log the cause of the problem in the syslog. Reviewed-by: Glauber Costa Acked-by: David Rientjes Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab_common.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 8cf8b4962d6c..fe8dc943c285 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -98,16 +98,36 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align unsigned long flags, void (*ctor)(void *)) { struct kmem_cache *s = NULL; + int err = 0; get_online_cpus(); mutex_lock(&slab_mutex); - if (kmem_cache_sanity_check(name, size) == 0) - s = __kmem_cache_create(name, size, align, flags, ctor); + + if (!kmem_cache_sanity_check(name, size) == 0) + goto out_locked; + + + s = __kmem_cache_create(name, size, align, flags, ctor); + if (!s) + err = -ENOSYS; /* Until __kmem_cache_create returns code */ + +out_locked: mutex_unlock(&slab_mutex); put_online_cpus(); - if (!s && (flags & SLAB_PANIC)) - panic("kmem_cache_create: Failed to create slab '%s'\n", name); + if (err) { + + if (flags & SLAB_PANIC) + panic("kmem_cache_create: Failed to create slab '%s'. Error %d\n", + name, err); + else { + printk(KERN_WARNING "kmem_cache_create(%s) failed with error %d", + name, err); + dump_stack(); + } + + return NULL; + } return s; } -- cgit v1.2.3-58-ga151 From 7c9adf5a5471647f392169ef19d3e81dcfa76045 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:38:33 +0000 Subject: mm/sl[aou]b: Move list_add() to slab_common.c Move the code to append the new kmem_cache to the list of slab caches to the kmem_cache_create code in the shared code. This is possible now since the acquisition of the mutex was moved into kmem_cache_create(). Acked-by: David Rientjes Reviewed-by: Glauber Costa Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 7 +++++-- mm/slab_common.c | 7 +++++++ mm/slob.c | 4 ++++ mm/slub.c | 2 -- 4 files changed, 16 insertions(+), 4 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 3b4587bb7b19..a69903168497 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1680,6 +1680,7 @@ void __init kmem_cache_init(void) ARCH_KMALLOC_FLAGS|SLAB_PANIC, NULL); + list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches); if (INDEX_AC != INDEX_L3) { sizes[INDEX_L3].cs_cachep = __kmem_cache_create(names[INDEX_L3].name, @@ -1687,6 +1688,7 @@ void __init kmem_cache_init(void) ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_PANIC, NULL); + list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches); } slab_early_init = 0; @@ -1705,6 +1707,7 @@ void __init kmem_cache_init(void) ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_PANIC, NULL); + list_add(&sizes->cs_cachep->list, &slab_caches); } #ifdef CONFIG_ZONE_DMA sizes->cs_dmacachep = __kmem_cache_create( @@ -1714,6 +1717,7 @@ void __init kmem_cache_init(void) ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC, NULL); + list_add(&sizes->cs_dmacachep->list, &slab_caches); #endif sizes++; names++; @@ -2583,6 +2587,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, } cachep->ctor = ctor; cachep->name = name; + cachep->refcount = 1; if (setup_cpu_cache(cachep, gfp)) { __kmem_cache_destroy(cachep); @@ -2599,8 +2604,6 @@ __kmem_cache_create (const char *name, size_t size, size_t align, slab_set_debugobj_lock_classes(cachep); } - /* cache setup completed, link it into the list */ - list_add(&cachep->list, &slab_caches); return cachep; } diff --git a/mm/slab_common.c b/mm/slab_common.c index fe8dc943c285..5190a7cd02bd 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -111,6 +111,13 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align if (!s) err = -ENOSYS; /* Until __kmem_cache_create returns code */ + /* + * Check if the slab has actually been created and if it was a + * real instatiation. Aliases do not belong on the list + */ + if (s && s->refcount == 1) + list_add(&s->list, &slab_caches); + out_locked: mutex_unlock(&slab_mutex); put_online_cpus(); diff --git a/mm/slob.c b/mm/slob.c index 45d4ca79933a..5225d28f2694 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -540,6 +540,10 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, void kmem_cache_destroy(struct kmem_cache *c) { + mutex_lock(&slab_mutex); + list_del(&c->list); + mutex_unlock(&slab_mutex); + kmemleak_free(c); if (c->flags & SLAB_DESTROY_BY_RCU) rcu_barrier(); diff --git a/mm/slub.c b/mm/slub.c index c66908983218..24aa362edef7 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3975,7 +3975,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size, align, flags, ctor)) { int r; - list_add(&s->list, &slab_caches); mutex_unlock(&slab_mutex); r = sysfs_slab_add(s); mutex_lock(&slab_mutex); @@ -3983,7 +3982,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, if (!r) return s; - list_del(&s->list); kmem_cache_close(s); } kmem_cache_free(kmem_cache, s); -- cgit v1.2.3-58-ga151 From 945cf2b6199be70ff03102b9e642c3bb05d01de9 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:18:33 +0000 Subject: mm/sl[aou]b: Extract a common function for kmem_cache_destroy kmem_cache_destroy does basically the same in all allocators. Extract common code which is easy since we already have common mutex handling. Reviewed-by: Glauber Costa Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 45 +++------------------------------------------ mm/slab.h | 3 +++ mm/slab_common.c | 25 +++++++++++++++++++++++++ mm/slob.c | 15 +++++++-------- mm/slub.c | 36 +++++++++++------------------------- 5 files changed, 49 insertions(+), 75 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index a69903168497..49a74b349e39 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2206,7 +2206,7 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) } } -static void __kmem_cache_destroy(struct kmem_cache *cachep) +void __kmem_cache_destroy(struct kmem_cache *cachep) { int i; struct kmem_list3 *l3; @@ -2763,49 +2763,10 @@ int kmem_cache_shrink(struct kmem_cache *cachep) } EXPORT_SYMBOL(kmem_cache_shrink); -/** - * kmem_cache_destroy - delete a cache - * @cachep: the cache to destroy - * - * Remove a &struct kmem_cache object from the slab cache. - * - * 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 - * cache being allocated each time a module is loaded and unloaded, if the - * module doesn't have persistent in-kernel storage across loads and unloads. - * - * The cache must be empty before calling this function. - * - * The caller must guarantee that no one will allocate memory from the cache - * during the kmem_cache_destroy(). - */ -void kmem_cache_destroy(struct kmem_cache *cachep) +int __kmem_cache_shutdown(struct kmem_cache *cachep) { - BUG_ON(!cachep || in_interrupt()); - - /* Find the cache in the chain of caches. */ - get_online_cpus(); - mutex_lock(&slab_mutex); - /* - * the chain is never empty, cache_cache is never destroyed - */ - list_del(&cachep->list); - if (__cache_shrink(cachep)) { - slab_error(cachep, "Can't free all objects"); - list_add(&cachep->list, &slab_caches); - mutex_unlock(&slab_mutex); - put_online_cpus(); - return; - } - - if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU)) - rcu_barrier(); - - __kmem_cache_destroy(cachep); - mutex_unlock(&slab_mutex); - put_online_cpus(); + return __cache_shrink(cachep); } -EXPORT_SYMBOL(kmem_cache_destroy); /* * Get the memory for a slab management obj. diff --git a/mm/slab.h b/mm/slab.h index db7848caaa25..07a537ed5da3 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -30,4 +30,7 @@ extern struct list_head slab_caches; struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); +int __kmem_cache_shutdown(struct kmem_cache *); +void __kmem_cache_destroy(struct kmem_cache *); + #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index 5190a7cd02bd..a1c4f0b5aaed 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -140,6 +140,31 @@ out_locked: } EXPORT_SYMBOL(kmem_cache_create); +void kmem_cache_destroy(struct kmem_cache *s) +{ + get_online_cpus(); + mutex_lock(&slab_mutex); + s->refcount--; + if (!s->refcount) { + list_del(&s->list); + + if (!__kmem_cache_shutdown(s)) { + if (s->flags & SLAB_DESTROY_BY_RCU) + rcu_barrier(); + + __kmem_cache_destroy(s); + } else { + list_add(&s->list, &slab_caches); + printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n", + s->name); + dump_stack(); + } + } + mutex_unlock(&slab_mutex); + put_online_cpus(); +} +EXPORT_SYMBOL(kmem_cache_destroy); + int slab_is_available(void) { return slab_state >= UP; diff --git a/mm/slob.c b/mm/slob.c index 5225d28f2694..289be4f4681a 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -538,18 +538,11 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, return c; } -void kmem_cache_destroy(struct kmem_cache *c) +void __kmem_cache_destroy(struct kmem_cache *c) { - mutex_lock(&slab_mutex); - list_del(&c->list); - mutex_unlock(&slab_mutex); - kmemleak_free(c); - if (c->flags & SLAB_DESTROY_BY_RCU) - rcu_barrier(); slob_free(c, sizeof(struct kmem_cache)); } -EXPORT_SYMBOL(kmem_cache_destroy); void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) { @@ -617,6 +610,12 @@ unsigned int kmem_cache_size(struct kmem_cache *c) } EXPORT_SYMBOL(kmem_cache_size); +int __kmem_cache_shutdown(struct kmem_cache *c) +{ + /* No way to check for remaining objects */ + return 0; +} + int kmem_cache_shrink(struct kmem_cache *d) { return 0; diff --git a/mm/slub.c b/mm/slub.c index 24aa362edef7..724adea34384 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -624,7 +624,7 @@ static void object_err(struct kmem_cache *s, struct page *page, print_trailer(s, page, object); } -static void slab_err(struct kmem_cache *s, struct page *page, char *fmt, ...) +static void slab_err(struct kmem_cache *s, struct page *page, const char *fmt, ...) { va_list args; char buf[100]; @@ -3146,7 +3146,7 @@ static void list_slab_objects(struct kmem_cache *s, struct page *page, sizeof(long), GFP_ATOMIC); if (!map) return; - slab_err(s, page, "%s", text); + slab_err(s, page, text, s->name); slab_lock(page); get_map(s, page, map); @@ -3178,7 +3178,7 @@ static void free_partial(struct kmem_cache *s, struct kmem_cache_node *n) discard_slab(s, page); } else { list_slab_objects(s, page, - "Objects remaining on kmem_cache_close()"); + "Objects remaining in %s on kmem_cache_close()"); } } } @@ -3191,7 +3191,6 @@ static inline int kmem_cache_close(struct kmem_cache *s) int node; flush_all(s); - free_percpu(s->cpu_slab); /* Attempt to free all objects */ for_each_node_state(node, N_NORMAL_MEMORY) { struct kmem_cache_node *n = get_node(s, node); @@ -3200,33 +3199,20 @@ static inline int kmem_cache_close(struct kmem_cache *s) if (n->nr_partial || slabs_node(s, node)) return 1; } + free_percpu(s->cpu_slab); free_kmem_cache_nodes(s); return 0; } -/* - * Close a cache and release the kmem_cache structure - * (must be used for caches created using kmem_cache_create) - */ -void kmem_cache_destroy(struct kmem_cache *s) +int __kmem_cache_shutdown(struct kmem_cache *s) { - mutex_lock(&slab_mutex); - s->refcount--; - if (!s->refcount) { - list_del(&s->list); - mutex_unlock(&slab_mutex); - if (kmem_cache_close(s)) { - printk(KERN_ERR "SLUB %s: %s called for cache that " - "still has objects.\n", s->name, __func__); - dump_stack(); - } - if (s->flags & SLAB_DESTROY_BY_RCU) - rcu_barrier(); - sysfs_slab_remove(s); - } else - mutex_unlock(&slab_mutex); + return kmem_cache_close(s); +} + +void __kmem_cache_destroy(struct kmem_cache *s) +{ + sysfs_slab_remove(s); } -EXPORT_SYMBOL(kmem_cache_destroy); /******************************************************************** * Kmalloc subsystem -- cgit v1.2.3-58-ga151 From 9b030cb865f137e1574596983face2a07e41e8b2 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:20:33 +0000 Subject: mm/sl[aou]b: Use "kmem_cache" name for slab cache with kmem_cache struct Make all allocators use the "kmem_cache" slabname for the "kmem_cache" structure. Reviewed-by: Glauber Costa Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 72 +++++++++++++++++++++++++++++--------------------------- mm/slab.h | 6 +++++ mm/slab_common.c | 1 + mm/slob.c | 8 +++++++ mm/slub.c | 2 -- 5 files changed, 52 insertions(+), 37 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 49a74b349e39..ef94799a1aa5 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -578,9 +578,9 @@ static struct arraycache_init initarray_generic = { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} }; /* internal cache of cache description objs */ -static struct kmem_list3 *cache_cache_nodelists[MAX_NUMNODES]; -static struct kmem_cache cache_cache = { - .nodelists = cache_cache_nodelists, +static struct kmem_list3 *kmem_cache_nodelists[MAX_NUMNODES]; +static struct kmem_cache kmem_cache_boot = { + .nodelists = kmem_cache_nodelists, .batchcount = 1, .limit = BOOT_CPUCACHE_ENTRIES, .shared = 1, @@ -1594,15 +1594,17 @@ void __init kmem_cache_init(void) int order; int node; + kmem_cache = &kmem_cache_boot; + if (num_possible_nodes() == 1) use_alien_caches = 0; for (i = 0; i < NUM_INIT_LISTS; i++) { kmem_list3_init(&initkmem_list3[i]); if (i < MAX_NUMNODES) - cache_cache.nodelists[i] = NULL; + kmem_cache->nodelists[i] = NULL; } - set_up_list3s(&cache_cache, CACHE_CACHE); + set_up_list3s(kmem_cache, CACHE_CACHE); /* * Fragmentation resistance on low memory - only use bigger @@ -1614,9 +1616,9 @@ 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 kmem_cache cache: it contains the struct + * kmem_cache structures of all caches, except kmem_cache itself: + * kmem_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. @@ -1625,43 +1627,43 @@ void __init kmem_cache_init(void) * An __init data area is used for the head array. * 3) Create the remaining kmalloc caches, with minimally sized * head arrays. - * 4) Replace the __init data head arrays for cache_cache and the first + * 4) Replace the __init data head arrays for kmem_cache and the first * kmalloc cache with kmalloc allocated arrays. - * 5) Replace the __init data for kmem_list3 for cache_cache and + * 5) Replace the __init data for kmem_list3 for kmem_cache and * the other cache's with kmalloc allocated memory. * 6) Resize the head arrays of the kmalloc caches to their final sizes. */ node = numa_mem_id(); - /* 1) create the cache_cache */ + /* 1) create the kmem_cache */ INIT_LIST_HEAD(&slab_caches); - list_add(&cache_cache.list, &slab_caches); - cache_cache.colour_off = cache_line_size(); - cache_cache.array[smp_processor_id()] = &initarray_cache.cache; - cache_cache.nodelists[node] = &initkmem_list3[CACHE_CACHE + node]; + list_add(&kmem_cache->list, &slab_caches); + kmem_cache->colour_off = cache_line_size(); + kmem_cache->array[smp_processor_id()] = &initarray_cache.cache; + kmem_cache->nodelists[node] = &initkmem_list3[CACHE_CACHE + node]; /* * struct kmem_cache size depends on nr_node_ids & nr_cpu_ids */ - cache_cache.size = offsetof(struct kmem_cache, array[nr_cpu_ids]) + + kmem_cache->size = offsetof(struct kmem_cache, array[nr_cpu_ids]) + nr_node_ids * sizeof(struct kmem_list3 *); - cache_cache.object_size = cache_cache.size; - cache_cache.size = ALIGN(cache_cache.size, + kmem_cache->object_size = kmem_cache->size; + kmem_cache->size = ALIGN(kmem_cache->object_size, cache_line_size()); - cache_cache.reciprocal_buffer_size = - reciprocal_value(cache_cache.size); + kmem_cache->reciprocal_buffer_size = + reciprocal_value(kmem_cache->size); for (order = 0; order < MAX_ORDER; order++) { - cache_estimate(order, cache_cache.size, - cache_line_size(), 0, &left_over, &cache_cache.num); - if (cache_cache.num) + cache_estimate(order, kmem_cache->size, + cache_line_size(), 0, &left_over, &kmem_cache->num); + if (kmem_cache->num) break; } - 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) + + BUG_ON(!kmem_cache->num); + kmem_cache->gfporder = order; + kmem_cache->colour = left_over / kmem_cache->colour_off; + kmem_cache->slab_size = ALIGN(kmem_cache->num * sizeof(kmem_bufctl_t) + sizeof(struct slab), cache_line_size()); /* 2+3) create the kmalloc caches */ @@ -1728,15 +1730,15 @@ void __init kmem_cache_init(void) ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); - BUG_ON(cpu_cache_get(&cache_cache) != &initarray_cache.cache); - memcpy(ptr, cpu_cache_get(&cache_cache), + BUG_ON(cpu_cache_get(kmem_cache) != &initarray_cache.cache); + memcpy(ptr, cpu_cache_get(kmem_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; + kmem_cache->array[smp_processor_id()] = ptr; ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT); @@ -1757,7 +1759,7 @@ void __init kmem_cache_init(void) int nid; for_each_online_node(nid) { - init_list(&cache_cache, &initkmem_list3[CACHE_CACHE + nid], nid); + init_list(kmem_cache, &initkmem_list3[CACHE_CACHE + nid], nid); init_list(malloc_sizes[INDEX_AC].cs_cachep, &initkmem_list3[SIZE_AC + nid], nid); @@ -2223,7 +2225,7 @@ void __kmem_cache_destroy(struct kmem_cache *cachep) kfree(l3); } } - kmem_cache_free(&cache_cache, cachep); + kmem_cache_free(kmem_cache, cachep); } @@ -2473,7 +2475,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, gfp = GFP_NOWAIT; /* Get cache's description obj. */ - cachep = kmem_cache_zalloc(&cache_cache, gfp); + cachep = kmem_cache_zalloc(kmem_cache, gfp); if (!cachep) return NULL; @@ -2531,7 +2533,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, if (!cachep->num) { printk(KERN_ERR "kmem_cache_create: couldn't create cache %s.\n", name); - kmem_cache_free(&cache_cache, cachep); + kmem_cache_free(kmem_cache, cachep); return NULL; } slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) @@ -3299,7 +3301,7 @@ static void *cache_alloc_debugcheck_after(struct kmem_cache *cachep, static bool slab_should_failslab(struct kmem_cache *cachep, gfp_t flags) { - if (cachep == &cache_cache) + if (cachep == kmem_cache) return false; return should_failslab(cachep->object_size, flags, cachep->flags); diff --git a/mm/slab.h b/mm/slab.h index 07a537ed5da3..6724aa6f662f 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -25,8 +25,14 @@ extern enum slab_state slab_state; /* The slab cache mutex protects the management structures during changes */ extern struct mutex slab_mutex; + +/* The list of all slab caches on the system */ extern struct list_head slab_caches; +/* The slab cache that manages slab cache information */ +extern struct kmem_cache *kmem_cache; + +/* Functions provided by the slab allocators */ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); diff --git a/mm/slab_common.c b/mm/slab_common.c index a1c4f0b5aaed..5374150f5486 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -22,6 +22,7 @@ enum slab_state slab_state; LIST_HEAD(slab_caches); DEFINE_MUTEX(slab_mutex); +struct kmem_cache *kmem_cache; #ifdef CONFIG_DEBUG_VM static int kmem_cache_sanity_check(const char *name, size_t size) diff --git a/mm/slob.c b/mm/slob.c index 289be4f4681a..7d272c3dcc08 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -622,8 +622,16 @@ int kmem_cache_shrink(struct kmem_cache *d) } EXPORT_SYMBOL(kmem_cache_shrink); +struct kmem_cache kmem_cache_boot = { + .name = "kmem_cache", + .size = sizeof(struct kmem_cache), + .flags = SLAB_PANIC, + .align = ARCH_KMALLOC_MINALIGN, +}; + void __init kmem_cache_init(void) { + kmem_cache = &kmem_cache_boot; slab_state = UP; } diff --git a/mm/slub.c b/mm/slub.c index 724adea34384..e0d1e0470309 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3221,8 +3221,6 @@ void __kmem_cache_destroy(struct kmem_cache *s) struct kmem_cache *kmalloc_caches[SLUB_PAGE_SHIFT]; EXPORT_SYMBOL(kmalloc_caches); -static struct kmem_cache *kmem_cache; - #ifdef CONFIG_ZONE_DMA static struct kmem_cache *kmalloc_dma_caches[SLUB_PAGE_SHIFT]; #endif -- cgit v1.2.3-58-ga151 From 8f4c765c22deee766319ae9a1db68325f14816e6 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:18:32 +0000 Subject: mm/sl[aou]b: Move freeing of kmem_cache structure to common code The freeing action is basically the same in all slab allocators. Move to the common kmem_cache_destroy() function. Reviewed-by: Glauber Costa Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 1 - mm/slab_common.c | 1 + mm/slob.c | 2 -- mm/slub.c | 2 -- 4 files changed, 1 insertion(+), 5 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index ef94799a1aa5..8ca6ec6301fa 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2225,7 +2225,6 @@ void __kmem_cache_destroy(struct kmem_cache *cachep) kfree(l3); } } - kmem_cache_free(kmem_cache, cachep); } diff --git a/mm/slab_common.c b/mm/slab_common.c index 5374150f5486..d6deae9108cd 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -154,6 +154,7 @@ void kmem_cache_destroy(struct kmem_cache *s) rcu_barrier(); __kmem_cache_destroy(s); + kmem_cache_free(kmem_cache, s); } else { list_add(&s->list, &slab_caches); printk(KERN_ERR "kmem_cache_destroy %s: Slab cache still has objects\n", diff --git a/mm/slob.c b/mm/slob.c index 7d272c3dcc08..cb4ab9675293 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -540,8 +540,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, void __kmem_cache_destroy(struct kmem_cache *c) { - kmemleak_free(c); - slob_free(c, sizeof(struct kmem_cache)); } void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) diff --git a/mm/slub.c b/mm/slub.c index e0d1e0470309..6f932f7a8219 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -213,7 +213,6 @@ static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) static inline void sysfs_slab_remove(struct kmem_cache *s) { kfree(s->name); - kmem_cache_free(kmem_cache, s); } #endif @@ -5206,7 +5205,6 @@ static void kmem_cache_release(struct kobject *kobj) struct kmem_cache *s = to_slab(kobj); kfree(s->name); - kmem_cache_free(kmem_cache, s); } static const struct sysfs_ops slab_sysfs_ops = { -- cgit v1.2.3-58-ga151 From 12c3667fb780e20360ad0bde32dfb3591ef609ad Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:38:33 +0000 Subject: mm/sl[aou]b: Get rid of __kmem_cache_destroy What is done there can be done in __kmem_cache_shutdown. This affects RCU handling somewhat. On rcu free all slab allocators do not refer to other management structures than the kmem_cache structure. Therefore these other structures can be freed before the rcu deferred free to the page allocator occurs. Reviewed-by: Joonsoo Kim Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 46 +++++++++++++++++++++------------------------- mm/slab.h | 1 - mm/slab_common.c | 1 - mm/slob.c | 4 ---- mm/slub.c | 10 +++++----- 5 files changed, 26 insertions(+), 36 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index 8ca6ec6301fa..de961b48a6a4 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2208,26 +2208,6 @@ static void slab_destroy(struct kmem_cache *cachep, struct slab *slabp) } } -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); - } - } -} - - /** * calculate_slab_order - calculate size (page order) of slabs * @cachep: pointer to the cache that is being created @@ -2364,9 +2344,6 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) * Cannot be called within a int, but can be interrupted. * The @ctor is run when new pages are allocated by the cache. * - * @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 flags are * * %SLAB_POISON - Poison the slab with a known test pattern (a5a5a5a5) @@ -2591,7 +2568,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, cachep->refcount = 1; if (setup_cpu_cache(cachep, gfp)) { - __kmem_cache_destroy(cachep); + __kmem_cache_shutdown(cachep); return NULL; } @@ -2766,7 +2743,26 @@ EXPORT_SYMBOL(kmem_cache_shrink); int __kmem_cache_shutdown(struct kmem_cache *cachep) { - return __cache_shrink(cachep); + int i; + struct kmem_list3 *l3; + int rc = __cache_shrink(cachep); + + if (rc) + return rc; + + 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); + } + } + return 0; } /* diff --git a/mm/slab.h b/mm/slab.h index 6724aa6f662f..c4f9a361bd18 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -37,6 +37,5 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); int __kmem_cache_shutdown(struct kmem_cache *); -void __kmem_cache_destroy(struct kmem_cache *); #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index d6deae9108cd..7df814e8fbea 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -153,7 +153,6 @@ void kmem_cache_destroy(struct kmem_cache *s) if (s->flags & SLAB_DESTROY_BY_RCU) rcu_barrier(); - __kmem_cache_destroy(s); kmem_cache_free(kmem_cache, s); } else { list_add(&s->list, &slab_caches); diff --git a/mm/slob.c b/mm/slob.c index cb4ab9675293..50f605322700 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -538,10 +538,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, return c; } -void __kmem_cache_destroy(struct kmem_cache *c) -{ -} - void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) { void *b; diff --git a/mm/slub.c b/mm/slub.c index 6f932f7a8219..e5e09873f5ec 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3205,12 +3205,12 @@ static inline int kmem_cache_close(struct kmem_cache *s) int __kmem_cache_shutdown(struct kmem_cache *s) { - return kmem_cache_close(s); -} + int rc = kmem_cache_close(s); -void __kmem_cache_destroy(struct kmem_cache *s) -{ - sysfs_slab_remove(s); + if (!rc) + sysfs_slab_remove(s); + + return rc; } /******************************************************************** -- cgit v1.2.3-58-ga151 From db265eca77000c5dafc5608975afe8dafb2a02d5 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:18:33 +0000 Subject: mm/sl[aou]b: Move duping of slab name to slab_common.c Duping of the slabname has to be done by each slab. Moving this code to slab_common avoids duplicate implementations. With this patch we have common string handling for all slab allocators. Strings passed to kmem_cache_create() are copied internally. Subsystems can create temporary strings to create slab caches. Slabs allocated in early states of bootstrap will never be freed (and those can never be freed since they are essential to slab allocator operations). During bootstrap we therefore do not have to worry about duping names. Reviewed-by: Glauber Costa Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab_common.c | 30 +++++++++++++++++++++--------- mm/slub.c | 21 ++------------------- 2 files changed, 23 insertions(+), 28 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index 7df814e8fbea..f18c06fd97c7 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -100,6 +100,7 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align { struct kmem_cache *s = NULL; int err = 0; + char *n; get_online_cpus(); mutex_lock(&slab_mutex); @@ -108,16 +109,26 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align goto out_locked; - s = __kmem_cache_create(name, size, align, flags, ctor); - if (!s) - err = -ENOSYS; /* Until __kmem_cache_create returns code */ + n = kstrdup(name, GFP_KERNEL); + if (!n) { + err = -ENOMEM; + goto out_locked; + } + + s = __kmem_cache_create(n, size, align, flags, ctor); + + if (s) { + /* + * Check if the slab has actually been created and if it was a + * real instatiation. Aliases do not belong on the list + */ + if (s->refcount == 1) + list_add(&s->list, &slab_caches); - /* - * Check if the slab has actually been created and if it was a - * real instatiation. Aliases do not belong on the list - */ - if (s && s->refcount == 1) - list_add(&s->list, &slab_caches); + } else { + kfree(n); + err = -ENOSYS; /* Until __kmem_cache_create returns code */ + } out_locked: mutex_unlock(&slab_mutex); @@ -153,6 +164,7 @@ void kmem_cache_destroy(struct kmem_cache *s) if (s->flags & SLAB_DESTROY_BY_RCU) rcu_barrier(); + kfree(s->name); kmem_cache_free(kmem_cache, s); } else { list_add(&s->list, &slab_caches); diff --git a/mm/slub.c b/mm/slub.c index e5e09873f5ec..91c9a2fe6760 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -210,10 +210,7 @@ static void sysfs_slab_remove(struct kmem_cache *); static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; } -static inline void sysfs_slab_remove(struct kmem_cache *s) -{ - kfree(s->name); -} +static inline void sysfs_slab_remove(struct kmem_cache *s) { } #endif @@ -3929,7 +3926,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { struct kmem_cache *s; - char *n; s = find_mergeable(size, align, flags, name, ctor); if (s) { @@ -3948,13 +3944,9 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, return s; } - n = kstrdup(name, GFP_KERNEL); - if (!n) - return NULL; - s = kmem_cache_alloc(kmem_cache, GFP_KERNEL); if (s) { - if (kmem_cache_open(s, n, + if (kmem_cache_open(s, name, size, align, flags, ctor)) { int r; @@ -3969,7 +3961,6 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, } kmem_cache_free(kmem_cache, s); } - kfree(n); return NULL; } @@ -5200,13 +5191,6 @@ static ssize_t slab_attr_store(struct kobject *kobj, return err; } -static void kmem_cache_release(struct kobject *kobj) -{ - struct kmem_cache *s = to_slab(kobj); - - kfree(s->name); -} - static const struct sysfs_ops slab_sysfs_ops = { .show = slab_attr_show, .store = slab_attr_store, @@ -5214,7 +5198,6 @@ static const struct sysfs_ops slab_sysfs_ops = { static struct kobj_type slab_ktype = { .sysfs_ops = &slab_sysfs_ops, - .release = kmem_cache_release }; static int uevent_filter(struct kset *kset, struct kobject *kobj) -- cgit v1.2.3-58-ga151 From cbb79694d592e9a76880f6ef6db8feccaeee1c32 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:18:32 +0000 Subject: mm/sl[aou]b: Do slab aliasing call from common code The slab aliasing logic causes some strange contortions in slub. So add a call to deal with aliases to slab_common.c but disable it for other slab allocators by providng stubs that fail to create aliases. Full general support for aliases will require additional cleanup passes and more standardization of fields in kmem_cache. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.h | 10 ++++++++++ mm/slab_common.c | 4 ++++ mm/slub.c | 15 +++++++++++---- 3 files changed, 25 insertions(+), 4 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index c4f9a361bd18..84c28f451d2d 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -36,6 +36,16 @@ extern struct kmem_cache *kmem_cache; struct kmem_cache *__kmem_cache_create(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); +#ifdef CONFIG_SLUB +struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *)); +#else +static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *)) +{ return NULL; } +#endif + + int __kmem_cache_shutdown(struct kmem_cache *); #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index f18c06fd97c7..adc42b01b25b 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -115,6 +115,10 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align goto out_locked; } + s = __kmem_cache_alias(name, size, align, flags, ctor); + if (s) + goto out_locked; + s = __kmem_cache_create(n, size, align, flags, ctor); if (s) { diff --git a/mm/slub.c b/mm/slub.c index 91c9a2fe6760..64d445e7a27d 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3708,7 +3708,7 @@ void __init kmem_cache_init(void) slub_max_order = 0; kmem_size = offsetof(struct kmem_cache, node) + - nr_node_ids * sizeof(struct kmem_cache_node *); + nr_node_ids * sizeof(struct kmem_cache_node *); /* Allocate two kmem_caches from the page allocator */ kmalloc_size = ALIGN(kmem_size, cache_line_size()); @@ -3922,7 +3922,7 @@ static struct kmem_cache *find_mergeable(size_t size, return NULL; } -struct kmem_cache *__kmem_cache_create(const char *name, size_t size, +struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { struct kmem_cache *s; @@ -3939,11 +3939,18 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, if (sysfs_slab_alias(s, name)) { s->refcount--; - return NULL; + s = NULL; } - return s; } + return s; +} + +struct kmem_cache *__kmem_cache_create(const char *name, size_t size, + size_t align, unsigned long flags, void (*ctor)(void *)) +{ + struct kmem_cache *s; + s = kmem_cache_alloc(kmem_cache, GFP_KERNEL); if (s) { if (kmem_cache_open(s, name, -- cgit v1.2.3-58-ga151 From 96d17b7be0a9849d381442030886211dbb2a7061 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:18:32 +0000 Subject: mm/sl[aou]b: Move sysfs_slab_add to common Simplify locking by moving the slab_add_sysfs after all locks have been dropped. Eases the upcoming move to provide sysfs support for all allocators. Reviewed-by: Glauber Costa Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.h | 3 +++ mm/slab_common.c | 8 ++++++++ mm/slub.c | 15 ++------------- 3 files changed, 13 insertions(+), 13 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index 84c28f451d2d..ec7b94429b99 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -39,10 +39,13 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, #ifdef CONFIG_SLUB struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); +extern int sysfs_slab_add(struct kmem_cache *s); #else static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { return NULL; } +static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } + #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index adc42b01b25b..4f722084baed 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -152,6 +152,14 @@ out_locked: return NULL; } + if (s->refcount == 1) { + err = sysfs_slab_add(s); + if (err) + printk(KERN_WARNING "kmem_cache_create(%s) failed to" + " create sysfs entry. Error %d\n", + name, err); + } + return s; } EXPORT_SYMBOL(kmem_cache_create); diff --git a/mm/slub.c b/mm/slub.c index 64d445e7a27d..8d00fd78df23 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -202,12 +202,10 @@ struct track { enum track_item { TRACK_ALLOC, TRACK_FREE }; #ifdef CONFIG_SYSFS -static int sysfs_slab_add(struct kmem_cache *); static int sysfs_slab_alias(struct kmem_cache *, const char *); static void sysfs_slab_remove(struct kmem_cache *); #else -static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; } static inline void sysfs_slab_remove(struct kmem_cache *s) { } @@ -3955,16 +3953,7 @@ struct kmem_cache *__kmem_cache_create(const char *name, size_t size, if (s) { if (kmem_cache_open(s, name, size, align, flags, ctor)) { - int r; - - mutex_unlock(&slab_mutex); - r = sysfs_slab_add(s); - mutex_lock(&slab_mutex); - - if (!r) - return s; - - kmem_cache_close(s); + return s; } kmem_cache_free(kmem_cache, s); } @@ -5258,7 +5247,7 @@ static char *create_unique_id(struct kmem_cache *s) return name; } -static int sysfs_slab_add(struct kmem_cache *s) +int sysfs_slab_add(struct kmem_cache *s) { int err; const char *name; -- cgit v1.2.3-58-ga151 From 278b1bb1313664d4999a7f7d47a8a8d964862d02 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Wed, 5 Sep 2012 00:20:34 +0000 Subject: mm/sl[aou]b: Move kmem_cache allocations into common code Shift the allocations to common code. That way the allocation and freeing of the kmem_cache structures is handled by common code. Reviewed-by: Glauber Costa Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 34 ++++++++++++++++------------------ mm/slab.h | 4 ++-- mm/slab_common.c | 18 ++++++++++-------- mm/slob.c | 42 +++++++++++++++++------------------------- mm/slub.c | 24 +++++++----------------- 5 files changed, 52 insertions(+), 70 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index de961b48a6a4..abc83334e5fb 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1676,7 +1676,8 @@ void __init kmem_cache_init(void) * bug. */ - sizes[INDEX_AC].cs_cachep = __kmem_cache_create(names[INDEX_AC].name, + sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + __kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name, sizes[INDEX_AC].cs_size, ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_PANIC, @@ -1684,8 +1685,8 @@ void __init kmem_cache_init(void) list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches); if (INDEX_AC != INDEX_L3) { - sizes[INDEX_L3].cs_cachep = - __kmem_cache_create(names[INDEX_L3].name, + sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + __kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name, sizes[INDEX_L3].cs_size, ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_PANIC, @@ -1704,7 +1705,8 @@ void __init kmem_cache_init(void) * allow tighter packing of the smaller caches. */ if (!sizes->cs_cachep) { - sizes->cs_cachep = __kmem_cache_create(names->name, + sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + __kmem_cache_create(sizes->cs_cachep, names->name, sizes->cs_size, ARCH_KMALLOC_MINALIGN, ARCH_KMALLOC_FLAGS|SLAB_PANIC, @@ -1712,7 +1714,8 @@ void __init kmem_cache_init(void) list_add(&sizes->cs_cachep->list, &slab_caches); } #ifdef CONFIG_ZONE_DMA - sizes->cs_dmacachep = __kmem_cache_create( + sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + __kmem_cache_create(sizes->cs_dmacachep, names->name_dma, sizes->cs_size, ARCH_KMALLOC_MINALIGN, @@ -2356,13 +2359,13 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) * 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, +int +__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { size_t left_over, slab_size, ralign; - struct kmem_cache *cachep = NULL; gfp_t gfp; + int err; #if DEBUG #if FORCED_DEBUG @@ -2450,11 +2453,6 @@ __kmem_cache_create (const char *name, size_t size, size_t align, else gfp = GFP_NOWAIT; - /* Get cache's description obj. */ - cachep = kmem_cache_zalloc(kmem_cache, gfp); - if (!cachep) - return NULL; - cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids]; cachep->object_size = size; cachep->align = align; @@ -2509,8 +2507,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, if (!cachep->num) { printk(KERN_ERR "kmem_cache_create: couldn't create cache %s.\n", name); - kmem_cache_free(kmem_cache, cachep); - return NULL; + return -E2BIG; } slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) + sizeof(struct slab), align); @@ -2567,9 +2564,10 @@ __kmem_cache_create (const char *name, size_t size, size_t align, cachep->name = name; cachep->refcount = 1; - if (setup_cpu_cache(cachep, gfp)) { + err = setup_cpu_cache(cachep, gfp); + if (err) { __kmem_cache_shutdown(cachep); - return NULL; + return err; } if (flags & SLAB_DEBUG_OBJECTS) { @@ -2582,7 +2580,7 @@ __kmem_cache_create (const char *name, size_t size, size_t align, slab_set_debugobj_lock_classes(cachep); } - return cachep; + return 0; } #if DEBUG diff --git a/mm/slab.h b/mm/slab.h index ec7b94429b99..077b07a24efe 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -33,8 +33,8 @@ extern struct list_head slab_caches; extern struct kmem_cache *kmem_cache; /* Functions provided by the slab allocators */ -struct kmem_cache *__kmem_cache_create(const char *name, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *)); +extern int __kmem_cache_create(struct kmem_cache *, const char *name, + size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); #ifdef CONFIG_SLUB struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, diff --git a/mm/slab_common.c b/mm/slab_common.c index 4f722084baed..f50d2ed4fbf1 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -119,19 +119,21 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align if (s) goto out_locked; - s = __kmem_cache_create(n, size, align, flags, ctor); - + s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL); if (s) { - /* - * Check if the slab has actually been created and if it was a - * real instatiation. Aliases do not belong on the list - */ - if (s->refcount == 1) + err = __kmem_cache_create(s, n, size, align, flags, ctor); + if (!err) + list_add(&s->list, &slab_caches); + else { + kfree(n); + kmem_cache_free(kmem_cache, s); + } + } else { kfree(n); - err = -ENOSYS; /* Until __kmem_cache_create returns code */ + err = -ENOMEM; } out_locked: diff --git a/mm/slob.c b/mm/slob.c index 50f605322700..9b0cee1e8475 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -508,34 +508,26 @@ size_t ksize(const void *block) } EXPORT_SYMBOL(ksize); -struct kmem_cache *__kmem_cache_create(const char *name, size_t size, +int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { - struct kmem_cache *c; - - c = slob_alloc(sizeof(struct kmem_cache), - GFP_KERNEL, ARCH_KMALLOC_MINALIGN, -1); - - if (c) { - c->name = name; - c->size = size; - if (flags & SLAB_DESTROY_BY_RCU) { - /* leave room for rcu footer at the end of object */ - c->size += sizeof(struct slob_rcu); - } - c->flags = flags; - c->ctor = ctor; - /* ignore alignment unless it's forced */ - c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0; - if (c->align < ARCH_SLAB_MINALIGN) - c->align = ARCH_SLAB_MINALIGN; - if (c->align < align) - c->align = align; - - kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL); - c->refcount = 1; + c->name = name; + c->size = size; + if (flags & SLAB_DESTROY_BY_RCU) { + /* leave room for rcu footer at the end of object */ + c->size += sizeof(struct slob_rcu); } - return c; + c->flags = flags; + c->ctor = ctor; + /* ignore alignment unless it's forced */ + c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0; + if (c->align < ARCH_SLAB_MINALIGN) + c->align = ARCH_SLAB_MINALIGN; + if (c->align < align) + c->align = align; + + c->refcount = 1; + return 0; } void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) diff --git a/mm/slub.c b/mm/slub.c index 8d00fd78df23..0ad3fffc7d23 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3034,7 +3034,6 @@ static int kmem_cache_open(struct kmem_cache *s, size_t align, unsigned long flags, void (*ctor)(void *)) { - memset(s, 0, kmem_size); s->name = name; s->ctor = ctor; s->object_size = size; @@ -3109,7 +3108,7 @@ static int kmem_cache_open(struct kmem_cache *s, goto error; if (alloc_kmem_cache_cpus(s)) - return 1; + return 0; free_kmem_cache_nodes(s); error: @@ -3118,7 +3117,7 @@ error: "order=%u offset=%u flags=%lx\n", s->name, (unsigned long)size, s->size, oo_order(s->oo), s->offset, flags); - return 0; + return -EINVAL; } /* @@ -3260,13 +3259,13 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name, { struct kmem_cache *s; - s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); + s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); /* * This function is called with IRQs disabled during early-boot on * single CPU so there's no need to take slab_mutex here. */ - if (!kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN, + if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN, flags, NULL)) goto panic; @@ -3944,20 +3943,11 @@ struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, return s; } -struct kmem_cache *__kmem_cache_create(const char *name, size_t size, +int __kmem_cache_create(struct kmem_cache *s, + const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { - struct kmem_cache *s; - - s = kmem_cache_alloc(kmem_cache, GFP_KERNEL); - if (s) { - if (kmem_cache_open(s, name, - size, align, flags, ctor)) { - return s; - } - kmem_cache_free(kmem_cache, s); - } - return NULL; + return kmem_cache_open(s, name, size, align, flags, ctor); } #ifdef CONFIG_SMP -- cgit v1.2.3-58-ga151 From 8a13a4cc80bb25c9eab2e7e56bab724fcfa55fce Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:18:33 +0000 Subject: mm/sl[aou]b: Shrink __kmem_cache_create() parameter lists Do the initial settings of the fields in common code. This will allow us to push more processing into common code later and improve readability. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 73 +++++++++++++++++++++++++------------------------------- mm/slab.h | 3 +-- mm/slab_common.c | 26 ++++++++++---------- mm/slob.c | 8 +++---- mm/slub.c | 39 ++++++++++++++---------------- 5 files changed, 68 insertions(+), 81 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index abc83334e5fb..f1f6d54e129a 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1677,20 +1677,20 @@ void __init kmem_cache_init(void) */ sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); - __kmem_cache_create(sizes[INDEX_AC].cs_cachep, names[INDEX_AC].name, - sizes[INDEX_AC].cs_size, - ARCH_KMALLOC_MINALIGN, - ARCH_KMALLOC_FLAGS|SLAB_PANIC, - NULL); - + sizes[INDEX_AC].cs_cachep->name = names[INDEX_AC].name; + sizes[INDEX_AC].cs_cachep->size = sizes[INDEX_AC].cs_size; + sizes[INDEX_AC].cs_cachep->object_size = sizes[INDEX_AC].cs_size; + sizes[INDEX_AC].cs_cachep->align = ARCH_KMALLOC_MINALIGN; + __kmem_cache_create(sizes[INDEX_AC].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); list_add(&sizes[INDEX_AC].cs_cachep->list, &slab_caches); + if (INDEX_AC != INDEX_L3) { sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); - __kmem_cache_create(sizes[INDEX_L3].cs_cachep, names[INDEX_L3].name, - sizes[INDEX_L3].cs_size, - ARCH_KMALLOC_MINALIGN, - ARCH_KMALLOC_FLAGS|SLAB_PANIC, - NULL); + sizes[INDEX_L3].cs_cachep->name = names[INDEX_L3].name; + sizes[INDEX_L3].cs_cachep->size = sizes[INDEX_L3].cs_size; + sizes[INDEX_L3].cs_cachep->object_size = sizes[INDEX_L3].cs_size; + sizes[INDEX_L3].cs_cachep->align = ARCH_KMALLOC_MINALIGN; + __kmem_cache_create(sizes[INDEX_L3].cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); list_add(&sizes[INDEX_L3].cs_cachep->list, &slab_caches); } @@ -1706,22 +1706,21 @@ void __init kmem_cache_init(void) */ if (!sizes->cs_cachep) { sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); - __kmem_cache_create(sizes->cs_cachep, names->name, - sizes->cs_size, - ARCH_KMALLOC_MINALIGN, - ARCH_KMALLOC_FLAGS|SLAB_PANIC, - NULL); + sizes->cs_cachep->name = names->name; + sizes->cs_cachep->size = sizes->cs_size; + sizes->cs_cachep->object_size = sizes->cs_size; + sizes->cs_cachep->align = ARCH_KMALLOC_MINALIGN; + __kmem_cache_create(sizes->cs_cachep, ARCH_KMALLOC_FLAGS|SLAB_PANIC); list_add(&sizes->cs_cachep->list, &slab_caches); } #ifdef CONFIG_ZONE_DMA sizes->cs_dmacachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + sizes->cs_dmacachep->name = names->name_dma; + sizes->cs_dmacachep->size = sizes->cs_size; + sizes->cs_dmacachep->object_size = sizes->cs_size; + sizes->cs_dmacachep->align = ARCH_KMALLOC_MINALIGN; __kmem_cache_create(sizes->cs_dmacachep, - names->name_dma, - sizes->cs_size, - ARCH_KMALLOC_MINALIGN, - ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| - SLAB_PANIC, - NULL); + ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC); list_add(&sizes->cs_dmacachep->list, &slab_caches); #endif sizes++; @@ -2360,12 +2359,12 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) * as davem. */ int -__kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, size_t align, - unsigned long flags, void (*ctor)(void *)) +__kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) { size_t left_over, slab_size, ralign; gfp_t gfp; int err; + size_t size = cachep->size; #if DEBUG #if FORCED_DEBUG @@ -2437,8 +2436,8 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s ralign = ARCH_SLAB_MINALIGN; } /* 3) caller mandated alignment */ - if (ralign < align) { - ralign = align; + if (ralign < cachep->align) { + ralign = cachep->align; } /* disable debug if necessary */ if (ralign > __alignof__(unsigned long long)) @@ -2446,7 +2445,7 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s /* * 4) Store it. */ - align = ralign; + cachep->align = ralign; if (slab_is_available()) gfp = GFP_KERNEL; @@ -2454,8 +2453,6 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s gfp = GFP_NOWAIT; cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids]; - cachep->object_size = size; - cachep->align = align; #if DEBUG /* @@ -2500,17 +2497,15 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s */ flags |= CFLGS_OFF_SLAB; - size = ALIGN(size, align); + size = ALIGN(size, cachep->align); - left_over = calculate_slab_order(cachep, size, align, flags); + left_over = calculate_slab_order(cachep, size, cachep->align, flags); - if (!cachep->num) { - printk(KERN_ERR - "kmem_cache_create: couldn't create cache %s.\n", name); + if (!cachep->num) return -E2BIG; - } + slab_size = ALIGN(cachep->num * sizeof(kmem_bufctl_t) - + sizeof(struct slab), align); + + sizeof(struct slab), cachep->align); /* * If the slab has been placed off-slab, and we have enough space then @@ -2538,8 +2533,8 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s cachep->colour_off = cache_line_size(); /* Offset must be a multiple of the alignment. */ - if (cachep->colour_off < align) - cachep->colour_off = align; + if (cachep->colour_off < cachep->align) + cachep->colour_off = cachep->align; cachep->colour = left_over / cachep->colour_off; cachep->slab_size = slab_size; cachep->flags = flags; @@ -2560,8 +2555,6 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s */ BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache)); } - cachep->ctor = ctor; - cachep->name = name; cachep->refcount = 1; err = setup_cpu_cache(cachep, gfp); diff --git a/mm/slab.h b/mm/slab.h index 077b07a24efe..67aeaa2d39cc 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -33,8 +33,7 @@ extern struct list_head slab_caches; extern struct kmem_cache *kmem_cache; /* Functions provided by the slab allocators */ -extern int __kmem_cache_create(struct kmem_cache *, const char *name, - size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); +extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags); #ifdef CONFIG_SLUB struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, diff --git a/mm/slab_common.c b/mm/slab_common.c index f50d2ed4fbf1..8a85a19d90ef 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -100,7 +100,6 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align { struct kmem_cache *s = NULL; int err = 0; - char *n; get_online_cpus(); mutex_lock(&slab_mutex); @@ -109,32 +108,33 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align goto out_locked; - n = kstrdup(name, GFP_KERNEL); - if (!n) { - err = -ENOMEM; - goto out_locked; - } - s = __kmem_cache_alias(name, size, align, flags, ctor); if (s) goto out_locked; s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL); if (s) { - err = __kmem_cache_create(s, n, size, align, flags, ctor); + s->object_size = s->size = size; + s->align = align; + s->ctor = ctor; + s->name = kstrdup(name, GFP_KERNEL); + if (!s->name) { + kmem_cache_free(kmem_cache, s); + err = -ENOMEM; + goto out_locked; + } + + err = __kmem_cache_create(s, flags); if (!err) list_add(&s->list, &slab_caches); else { - kfree(n); + kfree(s->name); kmem_cache_free(kmem_cache, s); } - - } else { - kfree(n); + } else err = -ENOMEM; - } out_locked: mutex_unlock(&slab_mutex); diff --git a/mm/slob.c b/mm/slob.c index 9b0cee1e8475..cac05d92f329 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -508,17 +508,15 @@ size_t ksize(const void *block) } EXPORT_SYMBOL(ksize); -int __kmem_cache_create(struct kmem_cache *c, const char *name, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *)) +int __kmem_cache_create(struct kmem_cache *c, unsigned long flags) { - c->name = name; - c->size = size; + size_t align = c->size; + if (flags & SLAB_DESTROY_BY_RCU) { /* leave room for rcu footer at the end of object */ c->size += sizeof(struct slob_rcu); } c->flags = flags; - c->ctor = ctor; /* ignore alignment unless it's forced */ c->align = (flags & SLAB_HWCACHE_ALIGN) ? SLOB_ALIGN : 0; if (c->align < ARCH_SLAB_MINALIGN) diff --git a/mm/slub.c b/mm/slub.c index 0ad3fffc7d23..d8ee419d5a15 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3029,16 +3029,9 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order) } -static int kmem_cache_open(struct kmem_cache *s, - const char *name, size_t size, - size_t align, unsigned long flags, - void (*ctor)(void *)) +static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) { - s->name = name; - s->ctor = ctor; - s->object_size = size; - s->align = align; - s->flags = kmem_cache_flags(size, flags, name, ctor); + s->flags = kmem_cache_flags(s->size, flags, s->name, s->ctor); s->reserved = 0; if (need_reserve_slab_rcu && (s->flags & SLAB_DESTROY_BY_RCU)) @@ -3115,7 +3108,7 @@ error: if (flags & SLAB_PANIC) panic("Cannot create slab %s size=%lu realsize=%u " "order=%u offset=%u flags=%lx\n", - s->name, (unsigned long)size, s->size, oo_order(s->oo), + s->name, (unsigned long)s->size, s->size, oo_order(s->oo), s->offset, flags); return -EINVAL; } @@ -3261,12 +3254,15 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name, s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT); + s->name = name; + s->size = s->object_size = size; + s->align = ARCH_KMALLOC_MINALIGN; + /* * This function is called with IRQs disabled during early-boot on * single CPU so there's no need to take slab_mutex here. */ - if (kmem_cache_open(s, name, size, ARCH_KMALLOC_MINALIGN, - flags, NULL)) + if (kmem_cache_open(s, flags)) goto panic; list_add(&s->list, &slab_caches); @@ -3719,9 +3715,10 @@ void __init kmem_cache_init(void) */ kmem_cache_node = (void *)kmem_cache + kmalloc_size; - kmem_cache_open(kmem_cache_node, "kmem_cache_node", - sizeof(struct kmem_cache_node), - 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); + kmem_cache_node->name = "kmem_cache_node"; + kmem_cache_node->size = kmem_cache_node->object_size = + sizeof(struct kmem_cache_node); + kmem_cache_open(kmem_cache_node, SLAB_HWCACHE_ALIGN | SLAB_PANIC); hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI); @@ -3729,8 +3726,10 @@ void __init kmem_cache_init(void) slab_state = PARTIAL; temp_kmem_cache = kmem_cache; - kmem_cache_open(kmem_cache, "kmem_cache", kmem_size, - 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); + kmem_cache->name = "kmem_cache"; + kmem_cache->size = kmem_cache->object_size = kmem_size; + kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC); + kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT); memcpy(kmem_cache, temp_kmem_cache, kmem_size); @@ -3943,11 +3942,9 @@ struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, return s; } -int __kmem_cache_create(struct kmem_cache *s, - const char *name, size_t size, - size_t align, unsigned long flags, void (*ctor)(void *)) +int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) { - return kmem_cache_open(s, name, size, align, flags, ctor); + return kmem_cache_open(s, flags); } #ifdef CONFIG_SMP -- cgit v1.2.3-58-ga151 From cce89f4f6911286500cf7be0363f46c9b0a12ce0 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 4 Sep 2012 23:38:33 +0000 Subject: mm/sl[aou]b: Move kmem_cache refcounting to common code Get rid of the refcount stuff in the allocators and do that part of kmem_cache management in the common code. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 1 - mm/slab_common.c | 5 +++-- mm/slob.c | 1 - mm/slub.c | 1 - 4 files changed, 3 insertions(+), 5 deletions(-) diff --git a/mm/slab.c b/mm/slab.c index f1f6d54e129a..11d9af5f9d2e 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2555,7 +2555,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) */ BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache)); } - cachep->refcount = 1; err = setup_cpu_cache(cachep, gfp); if (err) { diff --git a/mm/slab_common.c b/mm/slab_common.c index 8a85a19d90ef..651a3c60847a 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -125,11 +125,12 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align } err = __kmem_cache_create(s, flags); - if (!err) + if (!err) { + s->refcount = 1; list_add(&s->list, &slab_caches); - else { + } else { kfree(s->name); kmem_cache_free(kmem_cache, s); } diff --git a/mm/slob.c b/mm/slob.c index cac05d92f329..3edfeaac3208 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -524,7 +524,6 @@ int __kmem_cache_create(struct kmem_cache *c, unsigned long flags) if (c->align < align) c->align = align; - c->refcount = 1; return 0; } diff --git a/mm/slub.c b/mm/slub.c index d8ee419d5a15..0b122d8ec216 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3093,7 +3093,6 @@ static int kmem_cache_open(struct kmem_cache *s, unsigned long flags) else s->cpu_partial = 30; - s->refcount = 1; #ifdef CONFIG_NUMA s->remote_node_defrag_ratio = 1000; #endif -- cgit v1.2.3-58-ga151 From aac3a1664aba429f47c70edfc76ee10fcd808471 Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Wed, 5 Sep 2012 12:07:44 +0300 Subject: Revert "mm/sl[aou]b: Move sysfs_slab_add to common" This reverts commit 96d17b7be0a9849d381442030886211dbb2a7061 which caused the following errors at boot: [ 1.114885] kobject (ffff88001a802578): tried to init an initialized object, something is seriously wrong. [ 1.114885] Pid: 1, comm: swapper/0 Tainted: G W 3.6.0-rc1+ #6 [ 1.114885] Call Trace: [ 1.114885] [] kobject_init+0x87/0xa0 [ 1.115555] [] kobject_init_and_add+0x2a/0x90 [ 1.115555] [] ? sprintf+0x40/0x50 [ 1.115555] [] sysfs_slab_add+0x80/0x210 [ 1.115555] [] kmem_cache_create+0xa5/0x250 [ 1.115555] [] ? md_init+0x144/0x144 [ 1.115555] [] local_init+0xa4/0x11b [ 1.115555] [] dm_init+0x14/0x45 [ 1.115836] [] do_one_initcall+0x3a/0x160 [ 1.116834] [] kernel_init+0x133/0x1b7 [ 1.117835] [] ? do_early_param+0x86/0x86 [ 1.117835] [] kernel_thread_helper+0x4/0x10 [ 1.118401] [] ? start_kernel+0x33f/0x33f [ 1.119832] [] ? gs_change+0xb/0xb [ 1.120325] ------------[ cut here ]------------ [ 1.120835] WARNING: at fs/sysfs/dir.c:536 sysfs_add_one+0xc1/0xf0() [ 1.121437] sysfs: cannot create duplicate filename '/kernel/slab/:t-0000016' [ 1.121831] Modules linked in: [ 1.122138] Pid: 1, comm: swapper/0 Tainted: G W 3.6.0-rc1+ #6 [ 1.122831] Call Trace: [ 1.123074] [] ? sysfs_add_one+0xc1/0xf0 [ 1.123833] [] warn_slowpath_common+0x7a/0xb0 [ 1.124405] [] warn_slowpath_fmt+0x41/0x50 [ 1.124832] [] sysfs_add_one+0xc1/0xf0 [ 1.125337] [] create_dir+0x73/0xd0 [ 1.125832] [] sysfs_create_dir+0x81/0xe0 [ 1.126363] [] kobject_add_internal+0x9d/0x210 [ 1.126832] [] kobject_init_and_add+0x63/0x90 [ 1.127406] [] sysfs_slab_add+0x80/0x210 [ 1.127832] [] kmem_cache_create+0xa5/0x250 [ 1.128384] [] ? md_init+0x144/0x144 [ 1.128833] [] local_init+0xa4/0x11b [ 1.129831] [] dm_init+0x14/0x45 [ 1.130305] [] do_one_initcall+0x3a/0x160 [ 1.130831] [] kernel_init+0x133/0x1b7 [ 1.131351] [] ? do_early_param+0x86/0x86 [ 1.131830] [] kernel_thread_helper+0x4/0x10 [ 1.132392] [] ? start_kernel+0x33f/0x33f [ 1.132830] [] ? gs_change+0xb/0xb [ 1.133315] ---[ end trace 2703540871c8fab7 ]--- [ 1.133830] ------------[ cut here ]------------ [ 1.134274] WARNING: at lib/kobject.c:196 kobject_add_internal+0x1f5/0x210() [ 1.134829] kobject_add_internal failed for :t-0000016 with -EEXIST, don't try to register things with the same name in the same directory. [ 1.135829] Modules linked in: [ 1.136135] Pid: 1, comm: swapper/0 Tainted: G W 3.6.0-rc1+ #6 [ 1.136828] Call Trace: [ 1.137071] [] ? kobject_add_internal+0x1f5/0x210 [ 1.137830] [] warn_slowpath_common+0x7a/0xb0 [ 1.138402] [] warn_slowpath_fmt+0x41/0x50 [ 1.138830] [] ? release_sysfs_dirent+0x73/0xf0 [ 1.139419] [] kobject_add_internal+0x1f5/0x210 [ 1.139830] [] kobject_init_and_add+0x63/0x90 [ 1.140429] [] sysfs_slab_add+0x80/0x210 [ 1.140830] [] kmem_cache_create+0xa5/0x250 [ 1.141829] [] ? md_init+0x144/0x144 [ 1.142307] [] local_init+0xa4/0x11b [ 1.142829] [] dm_init+0x14/0x45 [ 1.143307] [] do_one_initcall+0x3a/0x160 [ 1.143829] [] kernel_init+0x133/0x1b7 [ 1.144352] [] ? do_early_param+0x86/0x86 [ 1.144829] [] kernel_thread_helper+0x4/0x10 [ 1.145405] [] ? start_kernel+0x33f/0x33f [ 1.145828] [] ? gs_change+0xb/0xb [ 1.146313] ---[ end trace 2703540871c8fab8 ]--- Conflicts: mm/slub.c Signed-off-by: Pekka Enberg --- mm/slab.h | 3 --- mm/slab_common.c | 8 -------- mm/slub.c | 19 +++++++++++++++++-- 3 files changed, 17 insertions(+), 13 deletions(-) diff --git a/mm/slab.h b/mm/slab.h index 67aeaa2d39cc..7deeb449a301 100644 --- a/mm/slab.h +++ b/mm/slab.h @@ -38,13 +38,10 @@ extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags); #ifdef CONFIG_SLUB struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)); -extern int sysfs_slab_add(struct kmem_cache *s); #else static inline struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, size_t align, unsigned long flags, void (*ctor)(void *)) { return NULL; } -static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } - #endif diff --git a/mm/slab_common.c b/mm/slab_common.c index 651a3c60847a..9c217255ac49 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -155,14 +155,6 @@ out_locked: return NULL; } - if (s->refcount == 1) { - err = sysfs_slab_add(s); - if (err) - printk(KERN_WARNING "kmem_cache_create(%s) failed to" - " create sysfs entry. Error %d\n", - name, err); - } - return s; } EXPORT_SYMBOL(kmem_cache_create); diff --git a/mm/slub.c b/mm/slub.c index 0b122d8ec216..dafd465f7a3f 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -202,10 +202,12 @@ struct track { enum track_item { TRACK_ALLOC, TRACK_FREE }; #ifdef CONFIG_SYSFS +static int sysfs_slab_add(struct kmem_cache *); static int sysfs_slab_alias(struct kmem_cache *, const char *); static void sysfs_slab_remove(struct kmem_cache *); #else +static inline int sysfs_slab_add(struct kmem_cache *s) { return 0; } static inline int sysfs_slab_alias(struct kmem_cache *s, const char *p) { return 0; } static inline void sysfs_slab_remove(struct kmem_cache *s) { } @@ -3943,7 +3945,20 @@ struct kmem_cache *__kmem_cache_alias(const char *name, size_t size, int __kmem_cache_create(struct kmem_cache *s, unsigned long flags) { - return kmem_cache_open(s, flags); + int err; + + err = kmem_cache_open(s, flags); + if (err) + return err; + + mutex_unlock(&slab_mutex); + err = sysfs_slab_add(s); + mutex_lock(&slab_mutex); + + if (err) + kmem_cache_close(s); + + return err; } #ifdef CONFIG_SMP @@ -5233,7 +5248,7 @@ static char *create_unique_id(struct kmem_cache *s) return name; } -int sysfs_slab_add(struct kmem_cache *s) +static int sysfs_slab_add(struct kmem_cache *s) { int err; const char *name; -- cgit v1.2.3-58-ga151 From 9df53b154ac712c87db1170057aa6df05eb7bdbd Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Sat, 8 Sep 2012 18:27:10 +0000 Subject: slub: Zero initial memory segment for kmem_cache and kmem_cache_node Tony Luck reported the following problem on IA-64: Worked fine yesterday on next-20120905, crashes today. First sign of trouble was an unaligned access, then a NULL dereference. SL*B related bits of my config: CONFIG_SLUB_DEBUG=y # CONFIG_SLAB is not set CONFIG_SLUB=y CONFIG_SLABINFO=y # CONFIG_SLUB_DEBUG_ON is not set # CONFIG_SLUB_STATS is not set And he console log. PID hash table entries: 4096 (order: 1, 32768 bytes) Dentry cache hash table entries: 262144 (order: 7, 2097152 bytes) Inode-cache hash table entries: 131072 (order: 6, 1048576 bytes) Memory: 2047920k/2086064k available (13992k code, 38144k reserved, 6012k data, 880k init) kernel unaligned access to 0xca2ffc55fb373e95, ip=0xa0000001001be550 swapper[0]: error during unaligned kernel access -1 [1] Modules linked in: Pid: 0, CPU 0, comm: swapper psr : 00001010084a2018 ifs : 800000000000060f ip : [] Not tainted (3.6.0-rc4-zx1-smp-next-20120906) ip is at new_slab+0x90/0x680 unat: 0000000000000000 pfs : 000000000000060f rsc : 0000000000000003 rnat: 9666960159966a59 bsps: a0000001001441c0 pr : 9666960159965a59 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c8a70433f csd : 0000000000000000 ssd : 0000000000000000 b0 : a0000001001be500 b6 : a00000010112cb20 b7 : a0000001011660a0 f6 : 0fff7f0f0f0f0e54f0000 f7 : 0ffe8c5c1000000000000 f8 : 1000d8000000000000000 f9 : 100068800000000000000 f10 : 10005f0f0f0f0e54f0000 f11 : 1003e0000000000000078 r1 : a00000010155eef0 r2 : 0000000000000000 r3 : fffffffffffc1638 r8 : e0000040600081b8 r9 : ca2ffc55fb373e95 r10 : 0000000000000000 r11 : e000004040001646 r12 : a000000101287e20 r13 : a000000101280000 r14 : 0000000000004000 r15 : 0000000000000078 r16 : ca2ffc55fb373e75 r17 : e000004040040000 r18 : fffffffffffc1646 r19 : e000004040001646 r20 : fffffffffffc15f8 r21 : 000000000000004d r22 : a00000010132fa68 r23 : 00000000000000ed r24 : 0000000000000000 r25 : 0000000000000000 r26 : 0000000000000001 r27 : a0000001012b8500 r28 : a00000010135f4a0 r29 : 0000000000000000 r30 : 0000000000000000 r31 : 0000000000000001 Unable to handle kernel NULL pointer dereference (address 0000000000000018) swapper[0]: Oops 11003706212352 [2] Modules linked in: Pid: 0, CPU 0, comm: swapper psr : 0000121008022018 ifs : 800000000000cc18 ip : [] Not tainted (3.6.0-rc4-zx1-smp-next-20120906) ip is at __copy_user+0x891/0x960 unat: 0000000000000000 pfs : 0000000000000813 rsc : 0000000000000003 rnat: 0000000000000000 bsps: 0000000000000000 pr : 9666960159961765 ldrs: 0000000000000000 ccv : 0000000000000000 fpsr: 0009804c0270033f csd : 0000000000000000 ssd : 0000000000000000 b0 : a00000010004b550 b6 : a00000010004b740 b7 : a00000010000c750 f6 : 000000000000000000000 f7 : 1003e9e3779b97f4a7c16 f8 : 1003e0a00000010001550 f9 : 100068800000000000000 f10 : 10005f0f0f0f0e54f0000 f11 : 1003e0000000000000078 r1 : a00000010155eef0 r2 : a0000001012870b0 r3 : a0000001012870b8 r8 : 0000000000000298 r9 : 0000000000000013 r10 : 0000000000000000 r11 : 9666960159961a65 r12 : a000000101287010 r13 : a000000101280000 r14 : a000000101287068 r15 : a000000101287080 r16 : 0000000000000298 r17 : 0000000000000010 r18 : 0000000000000018 r19 : a000000101287310 r20 : 0000000000000290 r21 : 0000000000000000 r22 : 0000000000000000 r23 : a000000101386f58 r24 : 0000000000000000 r25 : 000000007fffffff r26 : a000000101287078 r27 : a0000001013c69b0 r28 : 0000000000000000 r29 : 0000000000000014 r30 : 0000000000000000 r31 : 0000000000000813 Sedat Dilek and Hugh Dickins reported similar problems as well. Earlier patches in the common set moved the zeroing of the kmem_cache structure into common code. See "Move allocation of kmem_cache into common code". The allocation for the two special structures is still done from SLUB specific code but no zeroing is done since the cache creation functions used to zero. This now needs to be updated so that the structures are zeroed during allocation in kmem_cache_init(). Otherwise random pointer values may be followed. Reported-by: Tony Luck Reported-by: Sedat Dilek Tested-by: Sedat Dilek Reported-by: Hugh Dickins Tested-by: Sedat Dilek Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/mm/slub.c b/mm/slub.c index dafd465f7a3f..2258ed82880a 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3707,7 +3707,7 @@ void __init kmem_cache_init(void) /* Allocate two kmem_caches from the page allocator */ kmalloc_size = ALIGN(kmem_size, cache_line_size()); order = get_order(2 * kmalloc_size); - kmem_cache = (void *)__get_free_pages(GFP_NOWAIT, order); + kmem_cache = (void *)__get_free_pages(GFP_NOWAIT | __GFP_ZERO, order); /* * Must first have the slab cache available for the allocations of the -- cgit v1.2.3-58-ga151 From f28510d30c7f03daa290019fbc57ad8277347614 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 11 Sep 2012 19:49:38 +0000 Subject: slab: Only define slab_error for DEBUG On Tue, 11 Sep 2012, Stephen Rothwell wrote: > After merging the final tree, today's linux-next build (sparc64 defconfig) > produced this warning: > > mm/slab.c:808:13: warning: '__slab_error' defined but not used [-Wunused-function] > > Introduced by commit 945cf2b6199b ("mm/sl[aou]b: Extract a common > function for kmem_cache_destroy"). All uses of slab_error() are now > guarded by DEBUG. There is no use case left for slab builds without DEBUG. Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slab.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/slab.c b/mm/slab.c index 11d9af5f9d2e..8524923966b5 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -803,6 +803,7 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size, *left_over = slab_size - nr_objs*buffer_size - mgmt_size; } +#if DEBUG #define slab_error(cachep, msg) __slab_error(__func__, cachep, msg) static void __slab_error(const char *function, struct kmem_cache *cachep, @@ -812,6 +813,7 @@ static void __slab_error(const char *function, struct kmem_cache *cachep, function, cachep->name, msg); dump_stack(); } +#endif /* * By default on NUMA we use alien caches to stage the freeing of -- cgit v1.2.3-58-ga151