143 строки
3.1 KiB
C
143 строки
3.1 KiB
C
#ifndef _LINUX_SLAB_DEF_H
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#define _LINUX_SLAB_DEF_H
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/*
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* Definitions unique to the original Linux SLAB allocator.
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*
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* What we provide here is a way to optimize the frequent kmalloc
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* calls in the kernel by selecting the appropriate general cache
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* if kmalloc was called with a size that can be established at
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* compile time.
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*/
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#include <linux/init.h>
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#include <asm/page.h> /* kmalloc_sizes.h needs PAGE_SIZE */
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#include <asm/cache.h> /* kmalloc_sizes.h needs L1_CACHE_BYTES */
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#include <linux/compiler.h>
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#include <trace/kmemtrace.h>
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/* Size description struct for general caches. */
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struct cache_sizes {
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size_t cs_size;
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struct kmem_cache *cs_cachep;
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#ifdef CONFIG_ZONE_DMA
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struct kmem_cache *cs_dmacachep;
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#endif
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};
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extern struct cache_sizes malloc_sizes[];
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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void *__kmalloc(size_t size, gfp_t flags);
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#ifdef CONFIG_KMEMTRACE
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extern void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags);
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extern size_t slab_buffer_size(struct kmem_cache *cachep);
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#else
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static __always_inline void *
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kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags)
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{
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return kmem_cache_alloc(cachep, flags);
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}
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static inline size_t slab_buffer_size(struct kmem_cache *cachep)
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{
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return 0;
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}
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#endif
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static __always_inline void *kmalloc(size_t size, gfp_t flags)
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{
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struct kmem_cache *cachep;
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void *ret;
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if (__builtin_constant_p(size)) {
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int i = 0;
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if (!size)
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return ZERO_SIZE_PTR;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include <linux/kmalloc_sizes.h>
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#undef CACHE
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return NULL;
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found:
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#ifdef CONFIG_ZONE_DMA
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if (flags & GFP_DMA)
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cachep = malloc_sizes[i].cs_dmacachep;
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else
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#endif
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cachep = malloc_sizes[i].cs_cachep;
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ret = kmem_cache_alloc_notrace(cachep, flags);
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trace_kmalloc(_THIS_IP_, ret,
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size, slab_buffer_size(cachep), flags);
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return ret;
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}
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return __kmalloc(size, flags);
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}
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#ifdef CONFIG_NUMA
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extern void *__kmalloc_node(size_t size, gfp_t flags, int node);
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extern void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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#ifdef CONFIG_KMEMTRACE
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extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
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gfp_t flags,
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int nodeid);
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#else
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static __always_inline void *
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kmem_cache_alloc_node_notrace(struct kmem_cache *cachep,
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gfp_t flags,
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int nodeid)
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{
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return kmem_cache_alloc_node(cachep, flags, nodeid);
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}
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#endif
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static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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struct kmem_cache *cachep;
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void *ret;
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if (__builtin_constant_p(size)) {
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int i = 0;
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if (!size)
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return ZERO_SIZE_PTR;
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#define CACHE(x) \
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if (size <= x) \
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goto found; \
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else \
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i++;
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#include <linux/kmalloc_sizes.h>
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#undef CACHE
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return NULL;
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found:
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#ifdef CONFIG_ZONE_DMA
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if (flags & GFP_DMA)
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cachep = malloc_sizes[i].cs_dmacachep;
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else
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#endif
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cachep = malloc_sizes[i].cs_cachep;
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ret = kmem_cache_alloc_node_notrace(cachep, flags, node);
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trace_kmalloc_node(_THIS_IP_, ret,
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size, slab_buffer_size(cachep),
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flags, node);
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return ret;
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}
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return __kmalloc_node(size, flags, node);
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}
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#endif /* CONFIG_NUMA */
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#endif /* _LINUX_SLAB_DEF_H */
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