This patch adds the basic infrastructure for alloc / free operations
on pointer arrays. It includes a fallback function.
Allocators must define _HAVE_SLAB_ALLOCATOR_OPERATIONS in their
header files in order to implement their own fast version for
these array operations.
Signed-off-by: Christoph Lameter <cl@xxxxxxxxx>
Index: linux/include/linux/slab.h
===================================================================
--- linux.orig/include/linux/slab.h 2014-12-16 09:27:26.369447763 -0600
+++ linux/include/linux/slab.h 2014-12-18 10:30:33.394927526 -0600
@@ -123,6 +123,7 @@ struct kmem_cache *memcg_create_kmem_cac
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);
void kmem_cache_free(struct kmem_cache *, void *);
+void kmem_cache_free_array(struct kmem_cache *, int, void **);
/*
* Please use this macro to create slab caches. Simply specify the
@@ -289,6 +290,7 @@ static __always_inline int kmalloc_index
void *__kmalloc(size_t size, gfp_t flags);
void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags);
+int kmem_cache_alloc_array(struct kmem_cache *, gfp_t, int, void **);
#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node);
Index: linux/mm/slab_common.c
===================================================================
--- linux.orig/mm/slab_common.c 2014-12-12 10:27:49.360799479 -0600
+++ linux/mm/slab_common.c 2014-12-18 10:25:41.695889129 -0600
@@ -105,6 +105,31 @@ static inline int kmem_cache_sanity_chec
}
#endif
+#ifndef _HAVE_SLAB_ALLOCATOR_ARRAY_OPERATIONS
+int kmem_cache_alloc_array(struct kmem_cache *s, gfp_t flags, int nr, void **p)
+{
+ int i;
+
+ for (i=0; i < nr; i++) {
+ void *x = p[i] = kmem_cache_alloc(s, flags);
+ if (!x)
+ return i;
+ }
+ return nr;
+}
+EXPORT_SYMBOL(kmem_cache_alloc_array);
+
+void kmem_cache_free_array(struct kmem_cache *s, int nr, void **p)
+{
+ int i;
+
+ for (i=0; i < nr; i++)
+ kmem_cache_free(s, p[i]);
+}
+EXPORT_SYMBOL(kmem_cache_free_array);
+
+#endif
+
#ifdef CONFIG_MEMCG_KMEM
static int memcg_alloc_cache_params(struct mem_cgroup *memcg,
struct kmem_cache *s, struct kmem_cache *root_cache)
--
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