linux-kernel - [PATCH] Slab infrastructure for array operations

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Date:	Thu, 18 Dec 2014 10:33:23 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
cc:	akpm@...uxfoundation.org, Steven Rostedt <rostedt@...dmis.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <js1304@...il.com>
Subject: [PATCH] Slab infrastructure for array operations

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@...ux.com>

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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