143 строки
3.2 KiB
C
143 строки
3.2 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>
|
|
#include <trace/kmemtrace.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[];
|
|
|
|
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
|
|
void *__kmalloc(size_t size, gfp_t flags);
|
|
|
|
#ifdef CONFIG_KMEMTRACE
|
|
extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags);
|
|
extern size_t slab_buffer_size(struct kmem_cache *cachep);
|
|
#else
|
|
static __always_inline void *
|
|
kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags)
|
|
{
|
|
return kmem_cache_alloc(cachep, flags);
|
|
}
|
|
static inline size_t slab_buffer_size(struct kmem_cache *cachep)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
static __always_inline void *kmalloc(size_t size, gfp_t flags)
|
|
{
|
|
struct kmem_cache *cachep;
|
|
void *ret;
|
|
|
|
if (__builtin_constant_p(size)) {
|
|
int i = 0;
|
|
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
#define CACHE(x) \
|
|
if (size <= x) \
|
|
goto found; \
|
|
else \
|
|
i++;
|
|
#include <linux/kmalloc_sizes.h>
|
|
#undef CACHE
|
|
return NULL;
|
|
found:
|
|
#ifdef CONFIG_ZONE_DMA
|
|
if (flags & GFP_DMA)
|
|
cachep = malloc_sizes[i].cs_dmacachep;
|
|
else
|
|
#endif
|
|
cachep = malloc_sizes[i].cs_cachep;
|
|
|
|
ret = kmem_cache_alloc_notrace(cachep, flags);
|
|
|
|
kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_, ret,
|
|
size, slab_buffer_size(cachep), flags);
|
|
|
|
return ret;
|
|
}
|
|
return __kmalloc(size, flags);
|
|
}
|
|
|
|
#ifdef CONFIG_NUMA
|
|
extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
|
|
extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
|
|
|
|
#ifdef CONFIG_KMEMTRACE
|
|
extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
|
|
gfp_t flags,
|
|
int nodeid);
|
|
#else
|
|
static __always_inline void *
|
|
kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
|
|
gfp_t flags,
|
|
int nodeid)
|
|
{
|
|
return kmem_cache_alloc_node(cachep, flags, nodeid);
|
|
}
|
|
#endif
|
|
|
|
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
|
|
{
|
|
struct kmem_cache *cachep;
|
|
void *ret;
|
|
|
|
if (__builtin_constant_p(size)) {
|
|
int i = 0;
|
|
|
|
if (!size)
|
|
return ZERO_SIZE_PTR;
|
|
|
|
#define CACHE(x) \
|
|
if (size <= x) \
|
|
goto found; \
|
|
else \
|
|
i++;
|
|
#include <linux/kmalloc_sizes.h>
|
|
#undef CACHE
|
|
return NULL;
|
|
found:
|
|
#ifdef CONFIG_ZONE_DMA
|
|
if (flags & GFP_DMA)
|
|
cachep = malloc_sizes[i].cs_dmacachep;
|
|
else
|
|
#endif
|
|
cachep = malloc_sizes[i].cs_cachep;
|
|
|
|
ret = kmem_cache_alloc_node_notrace(cachep, flags, node);
|
|
|
|
kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_,
|
|
ret, size, slab_buffer_size(cachep),
|
|
flags, node);
|
|
|
|
return ret;
|
|
}
|
|
return __kmalloc_node(size, flags, node);
|
|
}
|
|
|
|
#endif /* CONFIG_NUMA */
|
|
|
|
#endif /* _LINUX_SLAB_DEF_H */
|