linux-stable/include/linux/slab_def.h
Christoph Lameter 4b51d66989 [PATCH] optional ZONE_DMA: optional ZONE_DMA in the VM
Make ZONE_DMA optional in core code.

- ifdef all code for ZONE_DMA and related definitions following the example
  for ZONE_DMA32 and ZONE_HIGHMEM.

- Without ZONE_DMA, ZONE_HIGHMEM and ZONE_DMA32 we get to a ZONES_SHIFT of
  0.

- Modify the VM statistics to work correctly without a DMA zone.

- Modify slab to not create DMA slabs if there is no ZONE_DMA.

[akpm@osdl.org: cleanup]
[jdike@addtoit.com: build fix]
[apw@shadowen.org: Simplify calculation of the number of bits we need for ZONES_SHIFT]
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Cc: Andi Kleen <ak@suse.de>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Kyle McMartin <kyle@mcmartin.ca>
Cc: Matthew Wilcox <willy@debian.org>
Cc: James Bottomley <James.Bottomley@steeleye.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Signed-off-by: Andy Whitcroft <apw@shadowen.org>
Signed-off-by: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-02-11 10:51:18 -08:00

112 lines
2.5 KiB
C

#ifndef _LINUX_SLAB_DEF_H
#define _LINUX_SLAB_DEF_H
/*
* Definitions unique to the original Linux SLAB allocator.
*
* What we provide here is a way to optimize the frequent kmalloc
* calls in the kernel by selecting the appropriate general cache
* if kmalloc was called with a size that can be established at
* compile time.
*/
#include <linux/init.h>
#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
#include <linux/compiler.h>
/* Size description struct for general caches. */
struct cache_sizes {
size_t cs_size;
struct kmem_cache *cs_cachep;
#ifdef CONFIG_ZONE_DMA
struct kmem_cache *cs_dmacachep;
#endif
};
extern struct cache_sizes malloc_sizes[];
static inline void *kmalloc(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_kmalloc_that_much(void);
__you_cannot_kmalloc_that_much();
}
found:
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_alloc(malloc_sizes[i].cs_dmacachep,
flags);
#endif
return kmem_cache_alloc(malloc_sizes[i].cs_cachep, flags);
}
return __kmalloc(size, flags);
}
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:
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_zalloc(malloc_sizes[i].cs_dmacachep,
flags);
#endif
return kmem_cache_zalloc(malloc_sizes[i].cs_cachep, flags);
}
return __kzalloc(size, flags);
}
#ifdef CONFIG_NUMA
extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
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_kmalloc_that_much(void);
__you_cannot_kmalloc_that_much();
}
found:
#ifdef CONFIG_ZONE_DMA
if (flags & GFP_DMA)
return kmem_cache_alloc_node(malloc_sizes[i].cs_dmacachep,
flags, node);
#endif
return kmem_cache_alloc_node(malloc_sizes[i].cs_cachep,
flags, node);
}
return __kmalloc_node(size, flags, node);
}
#endif /* CONFIG_NUMA */
#endif /* _LINUX_SLAB_DEF_H */