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slub: reduce differences between SMP and NUMA 

Reduce the #ifdefs and simplify bootstrap by making SMP and NUMA as much alike
as possible. This means that there will be an additional indirection to get to
the kmem_cache_node field under SMP.

Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2010-09-28 08:10:26 -05:00 committed by Pekka Enberg
parent ed59ecbf89
commit 7340cc8414
2 changed files with 2 additions and 42 deletions
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5
include/linux/slub_def.h
View File

@ -96,11 +96,8 @@ struct kmem_cache {
* Defragmentation by allocating from a remote node.
*/
int remote_node_defrag_ratio;
struct kmem_cache_node *node[MAX_NUMNODES];
#else
/* Avoid an extra cache line for UP */
struct kmem_cache_node local_node;
#endif
struct kmem_cache_node *node[MAX_NUMNODES];
};
/*

39
mm/slub.c
View File

@ -233,11 +233,7 @@ int slab_is_available(void)
static inline struct kmem_cache_node *get_node(struct kmem_cache *s, int node)
{
#ifdef CONFIG_NUMA
return s->node[node];
#else
return &s->local_node;
#endif
}
/* Verify that a pointer has an address that is valid within a slab page */
@ -871,7 +867,7 @@ static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
* dilemma by deferring the increment of the count during
* bootstrap (see early_kmem_cache_node_alloc).
*/
if (!NUMA_BUILD || n) {
if (n) {
atomic_long_inc(&n->nr_slabs);
atomic_long_add(objects, &n->total_objects);
}
@ -2112,7 +2108,6 @@ static inline int alloc_kmem_cache_cpus(struct kmem_cache *s)
return s->cpu_slab != NULL;
}
#ifdef CONFIG_NUMA
static struct kmem_cache *kmem_cache_node;
/*
@ -2202,17 +2197,6 @@ static int init_kmem_cache_nodes(struct kmem_cache *s)
}
return 1;
}
#else
static void free_kmem_cache_nodes(struct kmem_cache *s)
{
}
static int init_kmem_cache_nodes(struct kmem_cache *s)
{
init_kmem_cache_node(&s->local_node, s);
return 1;
}
#endif
static void set_min_partial(struct kmem_cache *s, unsigned long min)
{
@ -3023,8 +3007,6 @@ void __init kmem_cache_init(void)
int caches = 0;
struct kmem_cache *temp_kmem_cache;
int order;
#ifdef CONFIG_NUMA
struct kmem_cache *temp_kmem_cache_node;
unsigned long kmalloc_size;
@ -3048,12 +3030,6 @@ void __init kmem_cache_init(void)
0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL);
hotplug_memory_notifier(slab_memory_callback, SLAB_CALLBACK_PRI);
#else
/* Allocate a single kmem_cache from the page allocator */
kmem_size = sizeof(struct kmem_cache);
order = get_order(kmem_size);
kmem_cache = (void *)__get_free_pages(GFP_NOWAIT, order);
#endif
/* Able to allocate the per node structures */
slab_state = PARTIAL;
@ -3064,7 +3040,6 @@ void __init kmem_cache_init(void)
kmem_cache = kmem_cache_alloc(kmem_cache, GFP_NOWAIT);
memcpy(kmem_cache, temp_kmem_cache, kmem_size);
#ifdef CONFIG_NUMA
/*
* Allocate kmem_cache_node properly from the kmem_cache slab.
* kmem_cache_node is separately allocated so no need to
@ -3078,18 +3053,6 @@ void __init kmem_cache_init(void)
kmem_cache_bootstrap_fixup(kmem_cache_node);
caches++;
#else
/*
* kmem_cache has kmem_cache_node embedded and we moved it!
* Update the list heads
*/
INIT_LIST_HEAD(&kmem_cache->local_node.partial);
list_splice(&temp_kmem_cache->local_node.partial, &kmem_cache->local_node.partial);
#ifdef CONFIG_SLUB_DEBUG
INIT_LIST_HEAD(&kmem_cache->local_node.full);
list_splice(&temp_kmem_cache->local_node.full, &kmem_cache->local_node.full);
#endif
#endif
kmem_cache_bootstrap_fixup(kmem_cache);
caches++;
/* Free temporary boot structure */