-#ifdef CONFIG_SMP
-/*
- * Per cpu array for per cpu structures.
- *
- * The per cpu array places all kmem_cache_cpu structures from one processor
- * close together meaning that it becomes possible that multiple per cpu
- * structures are contained in one cacheline. This may be particularly
- * beneficial for the kmalloc caches.
- *
- * A desktop system typically has around 60-80 slabs. With 100 here we are
- * likely able to get per cpu structures for all caches from the array defined
- * here. We must be able to cover all kmalloc caches during bootstrap.
- *
- * If the per cpu array is exhausted then fall back to kmalloc
- * of individual cachelines. No sharing is possible then.
- */
-#define NR_KMEM_CACHE_CPU 100
-
-static DEFINE_PER_CPU(struct kmem_cache_cpu,
- kmem_cache_cpu)[NR_KMEM_CACHE_CPU];
-
-static DEFINE_PER_CPU(struct kmem_cache_cpu *, kmem_cache_cpu_free);
-static DECLARE_BITMAP(kmem_cach_cpu_free_init_once, CONFIG_NR_CPUS);
-
-static struct kmem_cache_cpu *alloc_kmem_cache_cpu(struct kmem_cache *s,
- int cpu, gfp_t flags)
-{
- struct kmem_cache_cpu *c = per_cpu(kmem_cache_cpu_free, cpu);
-
- if (c)
- per_cpu(kmem_cache_cpu_free, cpu) =
- (void *)c->freelist;
- else {
- /* Table overflow: So allocate ourselves */
- c = kmalloc_node(
- ALIGN(sizeof(struct kmem_cache_cpu), cache_line_size()),
- flags, cpu_to_node(cpu));
- if (!c)
- return NULL;
- }
-
- init_kmem_cache_cpu(s, c);
- return c;
-}
-
-static void free_kmem_cache_cpu(struct kmem_cache_cpu *c, int cpu)
-{
- if (c < per_cpu(kmem_cache_cpu, cpu) ||
- c >= per_cpu(kmem_cache_cpu, cpu) + NR_KMEM_CACHE_CPU) {
- kfree(c);
- return;
- }
- c->freelist = (void *)per_cpu(kmem_cache_cpu_free, cpu);
- per_cpu(kmem_cache_cpu_free, cpu) = c;
-}
-
-static void free_kmem_cache_cpus(struct kmem_cache *s)
-{
- int cpu;
-
- for_each_online_cpu(cpu) {
- struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);
-
- if (c) {
- s->cpu_slab[cpu] = NULL;
- free_kmem_cache_cpu(c, cpu);
- }
- }
-}
-
-static int alloc_kmem_cache_cpus(struct kmem_cache *s, gfp_t flags)
-{
- int cpu;
-
- for_each_online_cpu(cpu) {
- struct kmem_cache_cpu *c = get_cpu_slab(s, cpu);