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.
V2: Only warn once.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slub.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/mm/slub.c b/mm/slub.c
index c67bd0a..00f8557 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) {
+ printk("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);
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:45 2012
Message-Id: <20120820204045.631917955@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:23 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>,
David Rientjes <rientjes@xxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Subject: C12 [02/19] slub: Use kmem_cache for the kmem_cache structure
References: <20120820204021.494276880@xxxxxxxxx>
Do not use kmalloc() but kmem_cache_alloc() for the allocation
of the kmem_cache structures in slub.
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slub.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 00f8557..e0b9403 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 = {
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:46 2012
Message-Id: <20120820204045.851930436@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:24 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>,
David Rientjes <rientjes@xxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Subject: C12 [03/19] Improve error handling in kmem_cache_create
References: <20120820204021.494276880@xxxxxxxxx>
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.
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab_common.c | 28 +++++++++++++++++++++++-----
1 file changed, 23 insertions(+), 5 deletions(-)
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c 2012-08-17 14:51:51.000000000 -0500
+++ linux/mm/slab_common.c 2012-08-17 14:53:03.741358408 -0500
@@ -97,17 +97,37 @@ static inline int kmem_cache_sanity_chec
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;
+ struct kmem_cache *s;
+ 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;
}
>From cl@xxxxxxxxx Mon Aug 20 15:40:46 2012
Message-Id: <20120820204046.073099027@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:25 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>,
David Rientjes <rientjes@xxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Subject: C12 [04/19] Move list_add() to slab_common.c
References: <20120820204021.494276880@xxxxxxxxx>
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().
V1->V2:
- SLOB: Add code to remove the slab from list
(will be removed a couple of patches down when we also move the
list_del to common code).
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
Reviewed-by: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 3b4587b..a699031 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 b61c9ae..d419a3e 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 45d4ca7..5225d28 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 e0b9403..37d5177 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);
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:46 2012
Message-Id: <20120820204046.295896507@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:26 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [05/19] Extract a common function for kmem_cache_destroy
References: <20120820204021.494276880@xxxxxxxxx>
kmem_cache_destroy does basically the same in all allocators.
Extract common code which is easy since we already have common mutex handling.
V1-V2:
- Move percpu freeing to later so that we fail cleaner if
objects are left in the cache [JoonSoo Kim]
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 55 +++---------------------------------------------------
mm/slab.h | 3 +++
mm/slab_common.c | 25 +++++++++++++++++++++++++
mm/slob.c | 15 +++++++--------
mm/slub.c | 36 +++++++++++------------------------
5 files changed, 49 insertions(+), 85 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index a699031..6826d93 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -803,16 +803,6 @@ static void cache_estimate(unsigned long gfporder, size_t buffer_size,
*left_over = slab_size - nr_objs*buffer_size - mgmt_size;
}
-#define slab_error(cachep, msg) __slab_error(__func__, cachep, msg)
-
-static void __slab_error(const char *function, struct kmem_cache *cachep,
- char *msg)
-{
- printk(KERN_ERR "slab error in %s(): cache `%s': %s\n",
- function, cachep->name, msg);
- dump_stack();
-}
-
/*
* By default on NUMA we use alien caches to stage the freeing of
* objects allocated from other nodes. This causes massive memory
@@ -2206,7 +2196,7 @@ 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 +2753,10 @@ 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 db7848c..07a537e 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 d419a3e..5cc1371 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 5225d28..289be4f 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 37d5177..c99c0af 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
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:46 2012
Message-Id: <20120820204046.515866110@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:27 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [06/19] Always use the name "kmem_cache" for the slab cache
with the kmem_cache structure.
References: <20120820204021.494276880@xxxxxxxxx>
Make all allocators use the "kmem_cache" slabname for the "kmem_cache" structure.
Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
Reviewed-by: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 6826d93..6365632 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,
@@ -1584,15 +1584,17 @@ 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
@@ -1604,9 +1606,9 @@ 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.
@@ -1615,43 +1617,43 @@ 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 */
@@ -1718,15 +1720,15 @@ 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);
@@ -1747,7 +1749,7 @@ 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);
@@ -2213,7 +2215,7 @@ void __kmem_cache_destroy(struct kmem_cache *cachep)
kfree(l3);
}
}
- kmem_cache_free(&cache_cache, cachep);
+ kmem_cache_free(kmem_cache, cachep);
}
@@ -2463,7 +2465,7 @@ __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;
@@ -2521,7 +2523,7 @@ __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)
@@ -3289,7 +3291,7 @@ 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 07a537e..6724aa6 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 5cc1371..850c497 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 289be4f..7d272c3 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 c99c0af..607fee5 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
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:46 2012
Message-Id: <20120820204046.735969151@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:28 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [07/19] Move freeing of kmem_cache structure to common code
References: <20120820204021.494276880@xxxxxxxxx>
The freeing action is basically the same in all slab allocators.
Move to the common kmem_cache_destroy() function.
Reviewed-by: Joonsoo Kim <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 6365632..814cfc9 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2215,7 +2215,6 @@ 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 850c497..3e3c403 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 7d272c3..cb4ab96 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 607fee5..8da785a 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 = {
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:47 2012
Message-Id: <20120820204046.956046154@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:29 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [08/19] Get rid of __kmem_cache_destroy
References: <20120820204021.494276880@xxxxxxxxx>
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 <js1304@xxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 814cfc9..9449e7e 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2198,26 +2198,6 @@ 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
@@ -2354,9 +2334,6 @@ 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)
@@ -2581,7 +2558,7 @@ __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;
}
@@ -2756,7 +2733,26 @@ 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 6724aa6..c4f9a36 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 3e3c403..777cae0 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 cb4ab96..50f6053 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 8da785a..bb02589 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;
}
/********************************************************************
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:47 2012
Message-Id: <20120820204047.175918656@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:30 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [09/19] Move duping of slab name to slab_common.c
References: <20120820204021.494276880@xxxxxxxxx>
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.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 777cae0..cb3b2c1 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;
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 bb02589..09ea157 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)
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:47 2012
Message-Id: <20120820204047.397109364@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:31 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [10/19] Do slab aliasing call from common code
References: <20120820204021.494276880@xxxxxxxxx>
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.
V1->V2:
- Move kstrdup before kmem_cache_alias invocation.
(JoonSoo Kim)
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 c4f9a36..84c28f4 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 cb3b2c1..e5cd47f 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 09ea157..5751f30 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,
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:47 2012
Message-Id: <20120820204047.617307815@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:32 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [11/19] Move sysfs_slab_add to common
References: <20120820204021.494276880@xxxxxxxxx>
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.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
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 84c28f4..ec7b944 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 e5cd47f..ec93056 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 5751f30..5e37c89 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;
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:48 2012
Message-Id: <20120820204047.835900109@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:33 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [12/19] Move kmem_cache allocations into common code.
References: <20120820204021.494276880@xxxxxxxxx>
Shift the allocations to common code. That way the allocation
and freeing of the kmem_cache structures is handled by common code.
V2->V3: Use GFP_KERNEL instead of GFP_NOWAIT (JoonSoo Kim).
V1->V2: Use the return code from setup_cpucache() in slab instead of returning -ENOSPC
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 34 ++++++++++++++++------------------
mm/slab.h | 4 ++--
mm/slab_common.c | 18 ++++++++++--------
mm/slob.c | 43 ++++++++++++++++++-------------------------
mm/slub.c | 22 ++++++----------------
5 files changed, 52 insertions(+), 69 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 9449e7e..386447d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1666,7 +1666,8 @@ 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,
@@ -1674,8 +1675,8 @@ 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,
@@ -1694,7 +1695,8 @@ 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,
@@ -1702,7 +1704,8 @@ 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,
@@ -2346,13 +2349,13 @@ 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
@@ -2440,11 +2443,6 @@ __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;
@@ -2499,8 +2497,7 @@ __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);
@@ -2557,9 +2554,10 @@ __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) {
@@ -2572,7 +2570,7 @@ __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 ec7b944..077b07a 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 ec93056..6827d5b 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 50f6053..bffa8fa 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -508,34 +508,27 @@ 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;
+
+ kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
+ 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 5e37c89..6ad0edc 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;
}
/*
@@ -3266,7 +3265,7 @@ static struct kmem_cache *__init create_kmalloc_cache(const char *name,
* 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
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:48 2012
Message-Id: <20120820204048.054636477@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:34 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [13/19] Shrink __kmem_cache_create() parameter lists
References: <20120820204021.494276880@xxxxxxxxx>
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 <cl@xxxxxxxxx>
---
mm/slab.c | 91 ++++++++++++++++++++++++------------------------------
mm/slab.h | 3 +-
mm/slab_common.c | 26 ++++++++--------
mm/slob.c | 8 ++---
mm/slub.c | 39 +++++++++++------------
5 files changed, 76 insertions(+), 91 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 386447d..c2c1c88 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1667,20 +1667,20 @@ 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);
}
@@ -1696,22 +1696,21 @@ 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++;
@@ -2350,8 +2349,7 @@ 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;
@@ -2385,9 +2383,9 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
* unaligned accesses for some archs when redzoning is used, and makes
* sure any on-slab bufctl's are also correctly aligned.
*/
- if (size & (BYTES_PER_WORD - 1)) {
- size += (BYTES_PER_WORD - 1);
- size &= ~(BYTES_PER_WORD - 1);
+ if (cachep->size & (BYTES_PER_WORD - 1)) {
+ cachep->size += (BYTES_PER_WORD - 1);
+ cachep->size &= ~(BYTES_PER_WORD - 1);
}
/* calculate the final buffer alignment: */
@@ -2400,7 +2398,7 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
* one cacheline.
*/
ralign = cache_line_size();
- while (size <= ralign / 2)
+ while (cachep->size <= ralign / 2)
ralign /= 2;
} else {
ralign = BYTES_PER_WORD;
@@ -2418,8 +2416,8 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
ralign = REDZONE_ALIGN;
/* If redzoning, ensure that the second redzone is suitably
* aligned, by adjusting the object size accordingly. */
- size += REDZONE_ALIGN - 1;
- size &= ~(REDZONE_ALIGN - 1);
+ cachep->size += REDZONE_ALIGN - 1;
+ cachep->size &= ~(REDZONE_ALIGN - 1);
}
/* 2) arch mandated alignment */
@@ -2427,8 +2425,8 @@ __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))
@@ -2436,7 +2434,7 @@ __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;
@@ -2444,8 +2442,6 @@ __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
/*
@@ -2482,7 +2478,7 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
* it too early on. Always use on-slab management when
* SLAB_NOLEAKTRACE to avoid recursive calls into kmemleak)
*/
- if ((size >= (PAGE_SIZE >> 3)) && !slab_early_init &&
+ if ((cachep->size >= (PAGE_SIZE >> 3)) && !slab_early_init &&
!(flags & SLAB_NOLEAKTRACE))
/*
* Size is large, assume best to place the slab management obj
@@ -2490,17 +2486,15 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
*/
flags |= CFLGS_OFF_SLAB;
- size = ALIGN(size, align);
+ cachep->size = ALIGN(cachep->size, cachep->align);
- left_over = calculate_slab_order(cachep, size, align, flags);
+ left_over = calculate_slab_order(cachep, 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
@@ -2521,23 +2515,22 @@ __kmem_cache_create (struct kmem_cache *cachep, const char *name, size_t size, s
* poisoning, then it's going to smash the contents of
* the redzone and userword anyhow, so switch them off.
*/
- if (size % PAGE_SIZE == 0 && flags & SLAB_POISON)
+ if (cachep->size % PAGE_SIZE == 0 && flags & SLAB_POISON)
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
#endif
}
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;
cachep->allocflags = 0;
if (CONFIG_ZONE_DMA_FLAG && (flags & SLAB_CACHE_DMA))
cachep->allocflags |= GFP_DMA;
- cachep->size = size;
- cachep->reciprocal_buffer_size = reciprocal_value(size);
+ cachep->reciprocal_buffer_size = reciprocal_value(cachep->size);
if (flags & CFLGS_OFF_SLAB) {
cachep->slabp_cache = kmem_find_general_cachep(slab_size, 0u);
@@ -2550,8 +2543,6 @@ __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 077b07a..67aeaa2 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 6827d5b..4640ef65 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;
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 bffa8fa..0df4943 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 6ad0edc..744ba08 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_alloc(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
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:48 2012
Message-Id: <20120820204048.277068757@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:35 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [14/19] Move kmem_cache refcounting to common code
References: <20120820204021.494276880@xxxxxxxxx>
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 <cl@xxxxxxxxx>
---
mm/slab.c | 1 -
mm/slab_common.c | 5 +++--
mm/slob.c | 2 --
mm/slub.c | 1 -
4 files changed, 3 insertions(+), 6 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index c2c1c88..32ba049 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2543,7 +2543,6 @@ __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 4640ef65..0dc1cde 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 0df4943..3edfeaa 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -524,8 +524,6 @@ int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
if (c->align < align)
c->align = align;
- kmemleak_alloc(c, sizeof(struct kmem_cache), 1, GFP_KERNEL);
- c->refcount = 1;
return 0;
}
diff --git a/mm/slub.c b/mm/slub.c
index 744ba08..e8115c8 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
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:48 2012
Message-Id: <20120820204048.501111128@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:36 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [15/19] slab: Simplify bootstrap
References: <20120820204021.494276880@xxxxxxxxx>
The nodelists field in kmem_cache is pointing to the first unused
object in the array field when bootstrap is complete.
On boot we use a statically allocated array for that purpose.
A problem with the current approach is that the statically sized
kmem_cache structure can only contain NR_CPUS entries. If the number
of nodes plus the number of cpus is greater then we would overwrite
memory following the kmem_cache_boot definition.
Increase the size of the array field to ensure that also the node
pointers fit into the array field.
Once we do that we no longer need the kmem_cache_nodelists
array and we can then also simplify bootstrap.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
include/linux/slab_def.h | 2 +-
mm/slab.c | 18 +++++++++++++-----
2 files changed, 14 insertions(+), 6 deletions(-)
diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
index 36d7031..a2b9206 100644
--- a/include/linux/slab_def.h
+++ b/include/linux/slab_def.h
@@ -91,7 +91,7 @@ struct kmem_cache {
* is statically defined, so we reserve the max number of cpus.
*/
struct kmem_list3 **nodelists;
- struct array_cache *array[NR_CPUS];
+ struct array_cache *array[NR_CPUS + MAX_NUMNODES];
/*
* Do not add fields after array[]
*/
diff --git a/mm/slab.c b/mm/slab.c
index 32ba049..33449a6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -578,9 +578,7 @@ static struct arraycache_init initarray_generic =
{ {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
/* internal cache of cache description objs */
-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,
@@ -1572,6 +1570,15 @@ static void __init set_up_list3s(struct kmem_cache *cachep, int index)
}
/*
+ * The memory after the last cpu cache pointer is used for the
+ * the nodelists pointer.
+ */
+static void setup_nodelists_pointer(struct kmem_cache *s)
+{
+ s->nodelists = (struct kmem_list3 **)&s->array[nr_cpu_ids];
+}
+
+/*
* Initialisation. Called after the page allocator have been initialised and
* before smp_init().
*/
@@ -1585,13 +1592,15 @@ void __init kmem_cache_init(void)
int node;
kmem_cache = &kmem_cache_boot;
+ setup_nodelists_pointer(kmem_cache);
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)
+ if (i < nr_node_ids)
kmem_cache->nodelists[i] = NULL;
}
set_up_list3s(kmem_cache, CACHE_CACHE);
@@ -1631,7 +1640,6 @@ void __init kmem_cache_init(void)
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
@@ -2441,7 +2449,7 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
else
gfp = GFP_NOWAIT;
- cachep->nodelists = (struct kmem_list3 **)&cachep->array[nr_cpu_ids];
+ setup_nodelists_pointer(cachep);
#if DEBUG
/*
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:48 2012
Message-Id: <20120820204048.719864526@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:37 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [16/19] Create common functions for boot slab creation
References: <20120820204021.494276880@xxxxxxxxx>
Use a special function to create kmalloc caches and use that function in
SLAB and SLUB.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 48 ++++++++++++++----------------------------------
mm/slab.h | 5 +++++
mm/slab_common.c | 32 ++++++++++++++++++++++++++++++++
mm/slub.c | 36 +++---------------------------------
4 files changed, 54 insertions(+), 67 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 33449a6..4d88b39 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1674,23 +1674,13 @@ void __init kmem_cache_init(void)
* bug.
*/
- 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_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);
- }
+ sizes[INDEX_AC].cs_cachep = create_kmalloc_cache(names[INDEX_AC].name,
+ sizes[INDEX_AC].cs_size, ARCH_KMALLOC_FLAGS);
+
+ if (INDEX_AC != INDEX_L3)
+ sizes[INDEX_L3].cs_cachep =
+ create_kmalloc_cache(names[INDEX_L3].name,
+ sizes[INDEX_L3].cs_size, ARCH_KMALLOC_FLAGS);
slab_early_init = 0;
@@ -1702,24 +1692,14 @@ void __init kmem_cache_init(void)
* Note for systems short on memory removing the alignment will
* allow tighter packing of the smaller caches.
*/
- if (!sizes->cs_cachep) {
- 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);
- }
+ if (!sizes->cs_cachep)
+ sizes->cs_cachep = create_kmalloc_cache(names->name,
+ sizes->cs_size, ARCH_KMALLOC_FLAGS);
+
#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,
- ARCH_KMALLOC_FLAGS|SLAB_CACHE_DMA| SLAB_PANIC);
- list_add(&sizes->cs_dmacachep->list, &slab_caches);
+ sizes->cs_dmacachep = create_kmalloc_cache(
+ names->name_dma, sizes->cs_size,
+ SLAB_CACHE_DMA|ARCH_KMALLOC_FLAGS);
#endif
sizes++;
names++;
diff --git a/mm/slab.h b/mm/slab.h
index 67aeaa2..ad8a7de 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -35,6 +35,11 @@ extern struct kmem_cache *kmem_cache;
/* Functions provided by the slab allocators */
extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
+extern struct kmem_cache *create_kmalloc_cache(const char *name, size_t size,
+ unsigned long flags);
+extern void create_boot_cache(struct kmem_cache *, const char *name,
+ size_t size, 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 *));
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 0dc1cde..db7b6cf 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -197,3 +197,35 @@ int slab_is_available(void)
{
return slab_state >= UP;
}
+
+/* Create a cache during boot when no slab services are available yet */
+void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t size,
+ unsigned long flags)
+{
+ int err;
+
+ s->name = name;
+ s->size = s->object_size = size;
+ s->align = ARCH_KMALLOC_MINALIGN;
+ err = __kmem_cache_create(s, flags);
+
+ if (err)
+ panic("Creation of kmalloc slab %s size=%ld failed. Reason %d\n",
+ name, size, err);
+
+ list_add(&s->list, &slab_caches);
+ s->refcount = -1; /* Exempt from merging for now */
+}
+
+struct kmem_cache *__init create_kmalloc_cache(const char *name, size_t size,
+ unsigned long flags)
+{
+ struct kmem_cache *s = kmem_cache_zalloc(kmem_cache, GFP_NOWAIT);
+
+ if (!s)
+ panic("Out of memory when creating slab %s\n", name);
+
+ create_boot_cache(s, name, size, flags);
+ s->refcount = 1;
+ return s;
+}
diff --git a/mm/slub.c b/mm/slub.c
index e8115c8..05d7c50 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3246,32 +3246,6 @@ static int __init setup_slub_nomerge(char *str)
__setup("slub_nomerge", setup_slub_nomerge);
-static struct kmem_cache *__init create_kmalloc_cache(const char *name,
- int size, unsigned int flags)
-{
- struct kmem_cache *s;
-
- s = kmem_cache_alloc(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, flags))
- goto panic;
-
- list_add(&s->list, &slab_caches);
- return s;
-
-panic:
- panic("Creation of kmalloc slab %s size=%d failed.\n", name, size);
- return NULL;
-}
-
/*
* Conversion table for small slabs sizes / 8 to the index in the
* kmalloc array. This is necessary for slabs < 192 since we have non power
@@ -3714,10 +3688,8 @@ void __init kmem_cache_init(void)
*/
kmem_cache_node = (void *)kmem_cache + kmalloc_size;
- 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);
+ create_boot_cache(kmem_cache_node, "kmem_cache_node",
+ sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN);
hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
@@ -3725,9 +3697,7 @@ void __init kmem_cache_init(void)
slab_state = PARTIAL;
temp_kmem_cache = kmem_cache;
- kmem_cache->name = "kmem_cache";
- kmem_cache->size = kmem_cache->object_size = kmem_size;
- kmem_cache_open(kmem_cache, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
+ create_boot_cache(kmem_cache, "kmem_cache", kmem_size, SLAB_HWCACHE_ALIGN);
kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
memcpy(kmem_cache, temp_kmem_cache, kmem_size);
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:49 2012
Message-Id: <20120820204048.939929562@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:38 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [17/19] slub: Use a statically allocated kmem_cache boot structure for bootstrap
References: <20120820204021.494276880@xxxxxxxxx>
Simplify bootstrap by statically allocated two kmem_cache structures. These are
freed after bootup is complete. Allows us to no longer worry about calculations
of sizes of kmem_cache structures during bootstrap.
Reviewed-by: Glauber Costa <glommer@xxxxxxxxxxxxx>
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slub.c | 41 +++++++++++------------------------------
1 file changed, 11 insertions(+), 30 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index 05d7c50..2610bcb 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3642,9 +3642,6 @@ static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s)
{
int node;
- list_add(&s->list, &slab_caches);
- s->refcount = -1;
-
for_each_node_state(node, N_NORMAL_MEMORY) {
struct kmem_cache_node *n = get_node(s, node);
struct page *p;
@@ -3661,13 +3658,13 @@ static void __init kmem_cache_bootstrap_fixup(struct kmem_cache *s)
}
}
+static __initdata struct kmem_cache boot_kmem_cache,
+ boot_kmem_cache_node;
+
void __init kmem_cache_init(void)
{
int i;
- int caches = 0;
- struct kmem_cache *temp_kmem_cache;
- int order;
- struct kmem_cache *temp_kmem_cache_node;
+ int caches = 2;
unsigned long kmalloc_size;
if (debug_guardpage_minorder())
@@ -3676,49 +3673,33 @@ void __init kmem_cache_init(void)
kmem_size = offsetof(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);
-
- /*
- * Must first have the slab cache available for the allocations of the
- * struct kmem_cache_node's. There is special bootstrap code in
- * kmem_cache_open for slab_state == DOWN.
- */
- kmem_cache_node = (void *)kmem_cache + kmalloc_size;
+ kmem_cache_node = &boot_kmem_cache_node;
create_boot_cache(kmem_cache_node, "kmem_cache_node",
- sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN);
+ sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN);
hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
/* Able to allocate the per node structures */
slab_state = PARTIAL;
- temp_kmem_cache = kmem_cache;
- create_boot_cache(kmem_cache, "kmem_cache", kmem_size, SLAB_HWCACHE_ALIGN);
+ create_boot_cache(&boot_kmem_cache, "kmem_cache", kmem_size,
+ SLAB_HWCACHE_ALIGN);
- kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
- memcpy(kmem_cache, temp_kmem_cache, kmem_size);
+ kmem_cache = kmem_cache_alloc(&boot_kmem_cache, GFP_NOWAIT);
+ memcpy(kmem_cache, &boot_kmem_cache, kmem_size);
/*
* Allocate kmem_cache_node properly from the kmem_cache slab.
* kmem_cache_node is separately allocated so no need to
* update any list pointers.
*/
- temp_kmem_cache_node = kmem_cache_node;
-
kmem_cache_node = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
- memcpy(kmem_cache_node, temp_kmem_cache_node, kmem_size);
+ memcpy(kmem_cache_node, &boot_kmem_cache_node, kmem_size);
kmem_cache_bootstrap_fixup(kmem_cache_node);
-
- caches++;
kmem_cache_bootstrap_fixup(kmem_cache);
- caches++;
- /* Free temporary boot structure */
- free_pages((unsigned long)temp_kmem_cache, order);
/* Now we can use the kmem_cache to allocate kmalloc slabs */
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:49 2012
Message-Id: <20120820204049.162739290@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:39 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [18/19] slab: Use the new create_boot_cache function to simplify bootstrap
References: <20120820204021.494276880@xxxxxxxxx>
Simplify setup and reduce code in kmem_cache_init(). This allows us to
get rid of initarray_cache as well as the manual setup code for
the kmem_cache and kmem_cache_node arrays during bootstrap.
We introduce a new bootstrap state "PARTIAL" for slab that signals the
creation of a kmem_cache boot cache.
V1->V2: Get rid of initarray_cache as well.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 51 ++++++++++++++++++---------------------------------
1 file changed, 18 insertions(+), 33 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 4d88b39..0612c54 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -572,8 +572,6 @@ static struct cache_names __initdata cache_names[] = {
#undef CACHE
};
-static struct arraycache_init initarray_cache __initdata =
- { {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
static struct arraycache_init initarray_generic =
{ {0, BOOT_CPUCACHE_ENTRIES, 1, 0} };
@@ -1584,12 +1582,9 @@ static void setup_nodelists_pointer(struct kmem_cache *s)
*/
void __init kmem_cache_init(void)
{
- size_t left_over;
struct cache_sizes *sizes;
struct cache_names *names;
int i;
- int order;
- int node;
kmem_cache = &kmem_cache_boot;
setup_nodelists_pointer(kmem_cache);
@@ -1633,36 +1628,17 @@ void __init kmem_cache_init(void)
* 6) Resize the head arrays of the kmalloc caches to their final sizes.
*/
- node = numa_mem_id();
-
/* 1) create the kmem_cache */
- INIT_LIST_HEAD(&slab_caches);
- list_add(&kmem_cache->list, &slab_caches);
- kmem_cache->colour_off = cache_line_size();
- kmem_cache->array[smp_processor_id()] = &initarray_cache.cache;
/*
* struct kmem_cache size depends on nr_node_ids & nr_cpu_ids
*/
- kmem_cache->size = offsetof(struct kmem_cache, array[nr_cpu_ids]) +
- nr_node_ids * sizeof(struct kmem_list3 *);
- kmem_cache->object_size = kmem_cache->size;
- kmem_cache->size = ALIGN(kmem_cache->object_size,
- cache_line_size());
- kmem_cache->reciprocal_buffer_size =
- reciprocal_value(kmem_cache->size);
-
- for (order = 0; order < MAX_ORDER; order++) {
- cache_estimate(order, kmem_cache->size,
- cache_line_size(), 0, &left_over, &kmem_cache->num);
- if (kmem_cache->num)
- break;
- }
- 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());
+ create_boot_cache(kmem_cache, "kmem_cache",
+ offsetof(struct kmem_cache, array[nr_cpu_ids]) +
+ nr_node_ids * sizeof(struct kmem_list3 *),
+ SLAB_HWCACHE_ALIGN);
+
+ slab_state = PARTIAL;
/* 2+3) create the kmalloc caches */
sizes = malloc_sizes;
@@ -1710,7 +1686,6 @@ void __init kmem_cache_init(void)
ptr = kmalloc(sizeof(struct arraycache_init), GFP_NOWAIT);
- BUG_ON(cpu_cache_get(kmem_cache) != &initarray_cache.cache);
memcpy(ptr, cpu_cache_get(kmem_cache),
sizeof(struct arraycache_init));
/*
@@ -2265,7 +2240,16 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
if (slab_state == DOWN) {
/*
- * Note: the first kmem_cache_create must create the cache
+ * Note: Creation of first cache (kmem_cache).
+ * The setup_list3s is taken care
+ * of by the caller of __kmem_cache_create
+ */
+ cachep->array[smp_processor_id()] = &initarray_generic.cache;
+ slab_state = PARTIAL;
+ } else
+ if (slab_state == PARTIAL) {
+ /*
+ * Note: the second kmem_cache_create must create the cache
* that's used by kmalloc(24), otherwise the creation of
* further caches will BUG().
*/
@@ -2273,7 +2257,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
/*
* If the cache that's used by kmalloc(sizeof(kmem_list3)) is
- * the first cache, then we need to set up all its list3s,
+ * the second cache, then we need to set up all its list3s,
* otherwise the creation of further caches will BUG().
*/
set_up_list3s(cachep, SIZE_AC);
@@ -2282,6 +2266,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp)
else
slab_state = PARTIAL_ARRAYCACHE;
} else {
+ /* Remaining boot caches */
cachep->array[smp_processor_id()] =
kmalloc(sizeof(struct arraycache_init), gfp);
--
1.7.9.5
>From cl@xxxxxxxxx Mon Aug 20 15:40:49 2012
Message-Id: <20120820204049.378693056@xxxxxxxxx>
User-Agent: quilt/0.50-1
Date: Mon, 20 Aug 2012 15:40:40 -0500
From: Christoph Lameter <cl@xxxxxxxxx>
To: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <js1304@xxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxxxxx>
Cc: linux-mm@xxxxxxxxx
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Subject: C12 [19/19] Common alignment code
References: <20120820204021.494276880@xxxxxxxxx>
Extract the code to do object alignment from the allocators.
Do the alignment calculations in slab_common so that the
__kmem_cache_create functions of the allocators do not have
to deal with alignment.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
---
mm/slab.c | 20 --------------------
mm/slab.h | 3 +++
mm/slab_common.c | 32 ++++++++++++++++++++++++++++++--
mm/slob.c | 10 ----------
mm/slub.c | 38 +-------------------------------------
5 files changed, 34 insertions(+), 69 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 0612c54..6c26dec 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2361,22 +2361,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
cachep->size &= ~(BYTES_PER_WORD - 1);
}
- /* calculate the final buffer alignment: */
-
- /* 1) arch recommendation: can be overridden for debug */
- if (flags & SLAB_HWCACHE_ALIGN) {
- /*
- * Default alignment: as specified by the arch code. Except if
- * an object is really small, then squeeze multiple objects into
- * one cacheline.
- */
- ralign = cache_line_size();
- while (cachep->size <= ralign / 2)
- ralign /= 2;
- } else {
- ralign = BYTES_PER_WORD;
- }
-
/*
* Redzoning and user store require word alignment or possibly larger.
* Note this will be overridden by architecture or caller mandated
@@ -2393,10 +2377,6 @@ __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags)
cachep->size &= ~(REDZONE_ALIGN - 1);
}
- /* 2) arch mandated alignment */
- if (ralign < ARCH_SLAB_MINALIGN) {
- ralign = ARCH_SLAB_MINALIGN;
- }
/* 3) caller mandated alignment */
if (ralign < cachep->align) {
ralign = cachep->align;
diff --git a/mm/slab.h b/mm/slab.h
index ad8a7de..799f29a 100644
--- a/mm/slab.h
+++ b/mm/slab.h
@@ -32,6 +32,9 @@ extern struct list_head slab_caches;
/* The slab cache that manages slab cache information */
extern struct kmem_cache *kmem_cache;
+unsigned long calculate_alignment(unsigned long flags,
+ unsigned long align, unsigned long size);
+
/* Functions provided by the slab allocators */
extern int __kmem_cache_create(struct kmem_cache *, unsigned long flags);
diff --git a/mm/slab_common.c b/mm/slab_common.c
index db7b6cf..4268c40 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -71,6 +71,34 @@ static inline int kmem_cache_sanity_check(const char *name, size_t size)
#endif
/*
+ * Figure out what the alignment of the objects will be given a set of
+ * flags, a user specified alignment and the size of the objects.
+ */
+unsigned long calculate_alignment(unsigned long flags,
+ unsigned long align, unsigned long size)
+{
+ /*
+ * If the user wants hardware cache aligned objects then follow that
+ * suggestion if the object is sufficiently large.
+ *
+ * The hardware cache alignment cannot override the specified
+ * alignment though. If that is greater then use it.
+ */
+ if (flags & SLAB_HWCACHE_ALIGN) {
+ unsigned long ralign = cache_line_size();
+ while (size <= ralign / 2)
+ ralign /= 2;
+ align = max(align, ralign);
+ }
+
+ if (align < ARCH_SLAB_MINALIGN)
+ align = ARCH_SLAB_MINALIGN;
+
+ return ALIGN(align, sizeof(void *));
+}
+
+
+/*
* kmem_cache_create - Create a cache.
* @name: A string which is used in /proc/slabinfo to identify this cache.
* @size: The size of objects to be created in this cache.
@@ -115,7 +143,7 @@ struct kmem_cache *kmem_cache_create(const char *name, size_t size, size_t align
s = kmem_cache_zalloc(kmem_cache, GFP_KERNEL);
if (s) {
s->object_size = s->size = size;
- s->align = align;
+ s->align = calculate_alignment(flags, align, size);
s->ctor = ctor;
s->name = kstrdup(name, GFP_KERNEL);
if (!s->name) {
@@ -206,7 +234,7 @@ void __init create_boot_cache(struct kmem_cache *s, const char *name, size_t siz
s->name = name;
s->size = s->object_size = size;
- s->align = ARCH_KMALLOC_MINALIGN;
+ s->align = calculate_alignment(flags, ARCH_KMALLOC_MINALIGN, size);
err = __kmem_cache_create(s, flags);
if (err)
diff --git a/mm/slob.c b/mm/slob.c
index 3edfeaa..8a73604 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -124,7 +124,6 @@ static inline void clear_slob_page_free(struct page *sp)
#define SLOB_UNIT sizeof(slob_t)
#define SLOB_UNITS(size) (((size) + SLOB_UNIT - 1)/SLOB_UNIT)
-#define SLOB_ALIGN L1_CACHE_BYTES
/*
* struct slob_rcu is inserted at the tail of allocated slob blocks, which
@@ -510,20 +509,11 @@ EXPORT_SYMBOL(ksize);
int __kmem_cache_create(struct kmem_cache *c, unsigned long flags)
{
- 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;
- /* 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;
-
return 0;
}
diff --git a/mm/slub.c b/mm/slub.c
index 2610bcb..6a44211 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2754,32 +2754,6 @@ static inline int calculate_order(int size, int reserved)
return -ENOSYS;
}
-/*
- * Figure out what the alignment of the objects will be.
- */
-static unsigned long calculate_alignment(unsigned long flags,
- unsigned long align, unsigned long size)
-{
- /*
- * If the user wants hardware cache aligned objects then follow that
- * suggestion if the object is sufficiently large.
- *
- * The hardware cache alignment cannot override the specified
- * alignment though. If that is greater then use it.
- */
- if (flags & SLAB_HWCACHE_ALIGN) {
- unsigned long ralign = cache_line_size();
- while (size <= ralign / 2)
- ralign /= 2;
- align = max(align, ralign);
- }
-
- if (align < ARCH_SLAB_MINALIGN)
- align = ARCH_SLAB_MINALIGN;
-
- return ALIGN(align, sizeof(void *));
-}
-
static void
init_kmem_cache_node(struct kmem_cache_node *n)
{
@@ -2913,7 +2887,6 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
{
unsigned long flags = s->flags;
unsigned long size = s->object_size;
- unsigned long align = s->align;
int order;
/*
@@ -2985,19 +2958,11 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
#endif
/*
- * Determine the alignment based on various parameters that the
- * user specified and the dynamic determination of cache line size
- * on bootup.
- */
- align = calculate_alignment(flags, align, s->object_size);
- s->align = align;
-
- /*
* SLUB stores one object immediately after another beginning from
* offset 0. In order to align the objects we have to simply size
* each object to conform to the alignment.
*/
- size = ALIGN(size, align);
+ size = ALIGN(size, s->align);
s->size = size;
if (forced_order >= 0)
order = forced_order;
@@ -3026,7 +2991,6 @@ static int calculate_sizes(struct kmem_cache *s, int forced_order)
s->max = s->oo;
return !!oo_objects(s->oo);
-
}
static int kmem_cache_open(struct kmem_cache *s, unsigned long flags)
--
1.7.9.5
--
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