Merge branch 'slab/common-for-cgroups' into slab/for-linus
Fix up a trivial conflict with NUMA_NO_NODE cleanups.
Conflicts:
mm/slob.c
Signed-off-by: Pekka Enberg <penberg@kernel.org>
diff --git a/mm/slab.c b/mm/slab.c
index d264d90..a99f71a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -570,9 +570,9 @@
{ {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,
@@ -795,6 +795,7 @@
*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,
@@ -805,6 +806,7 @@
dump_stack();
add_taint(TAINT_BAD_PAGE);
}
+#endif
/*
* By default on NUMA we use alien caches to stage the freeing of
@@ -1587,15 +1589,17 @@
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
@@ -1607,9 +1611,9 @@
/* 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.
@@ -1618,43 +1622,43 @@
* 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 */
@@ -1667,19 +1671,22 @@
* 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);
+ sizes[INDEX_AC].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+ 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_create(names[INDEX_L3].name,
- sizes[INDEX_L3].cs_size,
- ARCH_KMALLOC_MINALIGN,
- ARCH_KMALLOC_FLAGS|SLAB_PANIC,
- NULL);
+ sizes[INDEX_L3].cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+ 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);
}
slab_early_init = 0;
@@ -1693,20 +1700,23 @@
* allow tighter packing of the smaller caches.
*/
if (!sizes->cs_cachep) {
- sizes->cs_cachep = __kmem_cache_create(names->name,
- sizes->cs_size,
- ARCH_KMALLOC_MINALIGN,
- ARCH_KMALLOC_FLAGS|SLAB_PANIC,
- NULL);
+ sizes->cs_cachep = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+ 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_create(
- names->name_dma,
- sizes->cs_size,
- ARCH_KMALLOC_MINALIGN,
- ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA|
- SLAB_PANIC,
- NULL);
+ 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,
+ ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC);
+ list_add(&sizes->cs_dmacachep->list, &slab_caches);
#endif
sizes++;
names++;
@@ -1717,15 +1727,15 @@
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);
@@ -1746,7 +1756,7 @@
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);
@@ -2195,27 +2205,6 @@
}
}
-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
@@ -2352,9 +2341,6 @@
* 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)
@@ -2367,13 +2353,13 @@
* 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 *))
+int
+__kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
{
size_t left_over, slab_size, ralign;
- struct kmem_cache *cachep = NULL;
gfp_t gfp;
+ int err;
+ size_t size = cachep->size;
#if DEBUG
#if FORCED_DEBUG
@@ -2445,8 +2431,8 @@
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))
@@ -2454,21 +2440,14 @@
/*
* 4) Store it.
*/
- align = ralign;
+ cachep->align = ralign;
if (slab_is_available())
gfp = GFP_KERNEL;
else
gfp = GFP_NOWAIT;
- /* Get cache's description obj. */
- cachep = kmem_cache_zalloc(&cache_cache, gfp);
- if (!cachep)
- return NULL;
-
cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
- cachep->object_size = size;
- cachep->align = align;
#if DEBUG
/*
@@ -2514,18 +2493,15 @@
*/
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);
- kmem_cache_free(&cache_cache, cachep);
- return NULL;
- }
+ 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
@@ -2553,8 +2529,8 @@
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;
@@ -2575,12 +2551,11 @@
*/
BUG_ON(ZERO_OR_NULL_PTR(cachep->slabp_cache));
}
- cachep->ctor = ctor;
- cachep->name = name;
- if (setup_cpu_cache(cachep, gfp)) {
- __kmem_cache_destroy(cachep);
- return NULL;
+ err = setup_cpu_cache(cachep, gfp);
+ if (err) {
+ __kmem_cache_shutdown(cachep);
+ return err;
}
if (flags & SLAB_DEBUG_OBJECTS) {
@@ -2593,9 +2568,7 @@
slab_set_debugobj_lock_classes(cachep);
}
- /* cache setup completed, link it into the list */
- list_add(&cachep->list, &slab_caches);
- return cachep;
+ return 0;
}
#if DEBUG
@@ -2754,49 +2727,29 @@
}
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());
+ int i;
+ struct kmem_list3 *l3;
+ int rc = __cache_shrink(cachep);
- /* 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 (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);
+ }
}
-
- if (unlikely(cachep->flags & SLAB_DESTROY_BY_RCU))
- rcu_barrier();
-
- __kmem_cache_destroy(cachep);
- mutex_unlock(&slab_mutex);
- put_online_cpus();
+ return 0;
}
-EXPORT_SYMBOL(kmem_cache_destroy);
/*
* Get the memory for a slab management obj.
@@ -3330,7 +3283,7 @@
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 db7848c..7deeb44 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -25,9 +25,26 @@
/* 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;
-struct kmem_cache *__kmem_cache_create(const char *name, size_t size,
+/* The slab cache that manages slab cache information */
+extern struct kmem_cache *kmem_cache;
+
+/* Functions provided by the slab allocators */
+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 *));
+#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 8cf8b49..9c21725 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)
@@ -98,21 +99,92 @@
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_alias(name, size, align, flags, ctor);
+ if (s)
+ goto out_locked;
+
+ s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
+ if (s) {
+ 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) {
+
+ s->refcount = 1;
+ list_add(&s->list, &slab_caches);
+
+ } else {
+ kfree(s->name);
+ kmem_cache_free(kmem_cache, s);
+ }
+ } else
+ err = -ENOMEM;
+
+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;
}
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();
+
+ kfree(s->name);
+ 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",
+ 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 dd47d16..f3a5ced 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -529,44 +529,24 @@
}
EXPORT_SYMBOL(ksize);
-struct kmem_cache *__kmem_cache_create(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)
{
- struct kmem_cache *c;
+ size_t align = c->size;
- c = slob_alloc(sizeof(struct kmem_cache),
- GFP_KERNEL, ARCH_KMALLOC_MINALIGN, NUMA_NO_NODE);
-
- 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;
+ 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;
+ /* 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;
-void kmem_cache_destroy(struct kmem_cache *c)
-{
- kmemleak_free(c);
- if (c->flags & SLAB_DESTROY_BY_RCU)
- rcu_barrier();
- slob_free(c, sizeof(struct kmem_cache));
+ return 0;
}
-EXPORT_SYMBOL(kmem_cache_destroy);
void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
{
@@ -634,14 +614,28 @@
}
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;
}
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 97a49d9..a0d6984 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -210,11 +210,7 @@
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);
- kfree(s);
-}
+static inline void sysfs_slab_remove(struct kmem_cache *s) { }
#endif
@@ -626,7 +622,7 @@
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];
@@ -2627,6 +2623,13 @@
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);
@@ -3041,17 +3044,9 @@
}
-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)
{
- memset(s, 0, kmem_size);
- 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))
@@ -3113,7 +3108,6 @@
else
s->cpu_partial = 30;
- s->refcount = 1;
#ifdef CONFIG_NUMA
s->remote_node_defrag_ratio = 1000;
#endif
@@ -3121,16 +3115,16 @@
goto error;
if (alloc_kmem_cache_cpus(s))
- return 1;
+ return 0;
free_kmem_cache_nodes(s);
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 0;
+ return -EINVAL;
}
/*
@@ -3152,7 +3146,7 @@
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);
@@ -3184,7 +3178,7 @@
discard_slab(s, page);
} else {
list_slab_objects(s, page,
- "Objects remaining on kmem_cache_close()");
+ "Objects remaining in %s on kmem_cache_close()");
}
}
}
@@ -3197,7 +3191,6 @@
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);
@@ -3206,33 +3199,20 @@
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();
+ int rc = kmem_cache_close(s);
+
+ if (!rc)
sysfs_slab_remove(s);
- } else
- mutex_unlock(&slab_mutex);
+
+ return rc;
}
-EXPORT_SYMBOL(kmem_cache_destroy);
/********************************************************************
* Kmalloc subsystem
@@ -3241,8 +3221,6 @@
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
@@ -3288,14 +3266,17 @@
{
struct kmem_cache *s;
- s = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
+ 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);
@@ -3734,12 +3715,12 @@
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());
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
@@ -3748,9 +3729,10 @@
*/
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);
@@ -3758,8 +3740,10 @@
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);
@@ -3948,11 +3932,10 @@
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;
- char *n;
s = find_mergeable(size, align, flags, name, ctor);
if (s) {
@@ -3966,36 +3949,29 @@
if (sysfs_slab_alias(s, name)) {
s->refcount--;
- return NULL;
+ s = NULL;
}
- return s;
}
- n = kstrdup(name, GFP_KERNEL);
- if (!n)
- return NULL;
+ return s;
+}
- s = kmalloc(kmem_size, GFP_KERNEL);
- if (s) {
- if (kmem_cache_open(s, n,
- size, align, flags, ctor)) {
- int r;
+int __kmem_cache_create(struct kmem_cache *s, unsigned long flags)
+{
+ int err;
- list_add(&s->list, &slab_caches);
- mutex_unlock(&slab_mutex);
- r = sysfs_slab_add(s);
- mutex_lock(&slab_mutex);
+ err = kmem_cache_open(s, flags);
+ if (err)
+ return err;
- if (!r)
- return s;
+ mutex_unlock(&slab_mutex);
+ err = sysfs_slab_add(s);
+ mutex_lock(&slab_mutex);
- list_del(&s->list);
- kmem_cache_close(s);
- }
- kfree(s);
- }
- kfree(n);
- return NULL;
+ if (err)
+ kmem_cache_close(s);
+
+ return err;
}
#ifdef CONFIG_SMP
@@ -5225,14 +5201,6 @@
return err;
}
-static void kmem_cache_release(struct kobject *kobj)
-{
- struct kmem_cache *s = to_slab(kobj);
-
- kfree(s->name);
- kfree(s);
-}
-
static const struct sysfs_ops slab_sysfs_ops = {
.show = slab_attr_show,
.store = slab_attr_store,
@@ -5240,7 +5208,6 @@
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)