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authorChristoph Lameter <cl@linux.com>2015-09-05 01:45:34 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-09-05 02:54:41 +0300
commit484748f0b65a1950b2b93f444a2287e8dd2cedd6 (patch)
treef7064d3e5cf25ba0a20fed59004797d7001418a5 /include/linux/slab.h
parent2ae44005b678431a5c7a55dafcd09421ba3fadf0 (diff)
downloadlinux-484748f0b65a1950b2b93f444a2287e8dd2cedd6.tar.xz
slab: infrastructure for bulk object allocation and freeing
Add the basic infrastructure for alloc/free operations on pointer arrays. It includes a generic function in the common slab code that is used in this infrastructure patch to create the unoptimized functionality for slab bulk operations. Allocators can then provide optimized allocation functions for situations in which large numbers of objects are needed. These optimization may avoid taking locks repeatedly and bypass metadata creation if all objects in slab pages can be used to provide the objects required. Allocators can extend the skeletons provided and add their own code to the bulk alloc and free functions. They can keep the generic allocation and freeing and just fall back to those if optimizations would not work (like for example when debugging is on). Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/slab.h')
-rw-r--r--include/linux/slab.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index a99f0e5243e1..7e37d448ed91 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -290,6 +290,16 @@ void *__kmalloc(size_t size, gfp_t flags);
void *kmem_cache_alloc(struct kmem_cache *, gfp_t flags);
void kmem_cache_free(struct kmem_cache *, void *);
+/*
+ * Bulk allocation and freeing operations. These are accellerated in an
+ * allocator specific way to avoid taking locks repeatedly or building
+ * metadata structures unnecessarily.
+ *
+ * Note that interrupts must be enabled when calling these functions.
+ */
+void kmem_cache_free_bulk(struct kmem_cache *, size_t, void **);
+bool kmem_cache_alloc_bulk(struct kmem_cache *, gfp_t, size_t, void **);
+
#ifdef CONFIG_NUMA
void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);