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authorPekka Enberg <penberg@cs.helsinki.fi>2006-03-25 03:06:43 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-25 08:22:49 -0800
commit40c07ae8daa659b8feb149c84731629386873c16 (patch)
tree77d9e7572135de30f184103cc6dd36f9c0f8dfbf
parenta8c0f9a41f88da703ade33f9c1626a55c786e8bb (diff)
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[PATCH] slab: optimize constant-size kzalloc calls
As suggested by Eric Dumazet, optimize kzalloc() calls that pass a compile-time constant size. Please note that the patch increases kernel text slightly (~200 bytes for defconfig on x86). Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/slab.h30
-rw-r--r--mm/util.c6
2 files changed, 30 insertions, 6 deletions
diff --git a/include/linux/slab.h b/include/linux/slab.h
index 1216b09e07b..15e1d9736b1 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -110,7 +110,30 @@ found:
return __kmalloc(size, flags);
}
-extern void *kzalloc(size_t, gfp_t);
+extern void *__kzalloc(size_t, gfp_t);
+
+static inline void *kzalloc(size_t size, gfp_t flags)
+{
+ if (__builtin_constant_p(size)) {
+ int i = 0;
+#define CACHE(x) \
+ if (size <= x) \
+ goto found; \
+ else \
+ i++;
+#include "kmalloc_sizes.h"
+#undef CACHE
+ {
+ extern void __you_cannot_kzalloc_that_much(void);
+ __you_cannot_kzalloc_that_much();
+ }
+found:
+ return kmem_cache_zalloc((flags & GFP_DMA) ?
+ malloc_sizes[i].cs_dmacachep :
+ malloc_sizes[i].cs_cachep, flags);
+ }
+ return __kzalloc(size, flags);
+}
/**
* kcalloc - allocate memory for an array. The memory is set to zero.
@@ -161,14 +184,14 @@ void *kmem_cache_zalloc(struct kmem_cache *, gfp_t);
void kmem_cache_free(struct kmem_cache *c, void *b);
const char *kmem_cache_name(struct kmem_cache *);
void *kmalloc(size_t size, gfp_t flags);
-void *kzalloc(size_t size, gfp_t flags);
+void *__kzalloc(size_t size, gfp_t flags);
void kfree(const void *m);
unsigned int ksize(const void *m);
unsigned int kmem_cache_size(struct kmem_cache *c);
static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
{
- return kzalloc(n * size, flags);
+ return __kzalloc(n * size, flags);
}
#define kmem_cache_shrink(d) (0)
@@ -176,6 +199,7 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
#define kmem_ptr_validate(a, b) (0)
#define kmem_cache_alloc_node(c, f, n) kmem_cache_alloc(c, f)
#define kmalloc_node(s, f, n) kmalloc(s, f)
+#define kzalloc(s, f) __kzalloc(s, f)
#define ____kmalloc kmalloc
#endif /* CONFIG_SLOB */
diff --git a/mm/util.c b/mm/util.c
index b68d3d7d035..7368479220b 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -5,18 +5,18 @@
#include <asm/uaccess.h>
/**
- * kzalloc - allocate memory. The memory is set to zero.
+ * __kzalloc - allocate memory. The memory is set to zero.
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate.
*/
-void *kzalloc(size_t size, gfp_t flags)
+void *__kzalloc(size_t size, gfp_t flags)
{
void *ret = ____kmalloc(size, flags);
if (ret)
memset(ret, 0, size);
return ret;
}
-EXPORT_SYMBOL(kzalloc);
+EXPORT_SYMBOL(__kzalloc);
/*
* kstrdup - allocate space for and copy an existing string