| #ifndef _LINUX_SLUB_DEF_H |
| #define _LINUX_SLUB_DEF_H |
| |
| /* |
| * SLUB : A Slab allocator without object queues. |
| * |
| * (C) 2007 SGI, Christoph Lameter |
| */ |
| #include <linux/types.h> |
| #include <linux/gfp.h> |
| #include <linux/workqueue.h> |
| #include <linux/kobject.h> |
| #include <trace/kmemtrace.h> |
| |
| enum stat_item { |
| ALLOC_FASTPATH, /* Allocation from cpu slab */ |
| ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */ |
| FREE_FASTPATH, /* Free to cpu slub */ |
| FREE_SLOWPATH, /* Freeing not to cpu slab */ |
| FREE_FROZEN, /* Freeing to frozen slab */ |
| FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ |
| FREE_REMOVE_PARTIAL, /* Freeing removes last object */ |
| ALLOC_FROM_PARTIAL, /* Cpu slab acquired from partial list */ |
| ALLOC_SLAB, /* Cpu slab acquired from page allocator */ |
| ALLOC_REFILL, /* Refill cpu slab from slab freelist */ |
| FREE_SLAB, /* Slab freed to the page allocator */ |
| CPUSLAB_FLUSH, /* Abandoning of the cpu slab */ |
| DEACTIVATE_FULL, /* Cpu slab was full when deactivated */ |
| DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */ |
| DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */ |
| DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */ |
| DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */ |
| ORDER_FALLBACK, /* Number of times fallback was necessary */ |
| NR_SLUB_STAT_ITEMS }; |
| |
| struct kmem_cache_cpu { |
| void **freelist; /* Pointer to first free per cpu object */ |
| struct page *page; /* The slab from which we are allocating */ |
| int node; /* The node of the page (or -1 for debug) */ |
| unsigned int offset; /* Freepointer offset (in word units) */ |
| unsigned int objsize; /* Size of an object (from kmem_cache) */ |
| #ifdef CONFIG_SLUB_STATS |
| unsigned stat[NR_SLUB_STAT_ITEMS]; |
| #endif |
| }; |
| |
| struct kmem_cache_node { |
| spinlock_t list_lock; /* Protect partial list and nr_partial */ |
| unsigned long nr_partial; |
| struct list_head partial; |
| #ifdef CONFIG_SLUB_DEBUG |
| atomic_long_t nr_slabs; |
| atomic_long_t total_objects; |
| struct list_head full; |
| #endif |
| }; |
| |
| /* |
| * Word size structure that can be atomically updated or read and that |
| * contains both the order and the number of objects that a slab of the |
| * given order would contain. |
| */ |
| struct kmem_cache_order_objects { |
| unsigned long x; |
| }; |
| |
| /* |
| * Slab cache management. |
| */ |
| struct kmem_cache { |
| /* Used for retriving partial slabs etc */ |
| unsigned long flags; |
| int size; /* The size of an object including meta data */ |
| int objsize; /* The size of an object without meta data */ |
| int offset; /* Free pointer offset. */ |
| struct kmem_cache_order_objects oo; |
| |
| /* |
| * Avoid an extra cache line for UP, SMP and for the node local to |
| * struct kmem_cache. |
| */ |
| struct kmem_cache_node local_node; |
| |
| /* Allocation and freeing of slabs */ |
| struct kmem_cache_order_objects max; |
| struct kmem_cache_order_objects min; |
| gfp_t allocflags; /* gfp flags to use on each alloc */ |
| int refcount; /* Refcount for slab cache destroy */ |
| void (*ctor)(void *); |
| int inuse; /* Offset to metadata */ |
| int align; /* Alignment */ |
| unsigned long min_partial; |
| const char *name; /* Name (only for display!) */ |
| struct list_head list; /* List of slab caches */ |
| #ifdef CONFIG_SLUB_DEBUG |
| struct kobject kobj; /* For sysfs */ |
| #endif |
| |
| #ifdef CONFIG_NUMA |
| /* |
| * Defragmentation by allocating from a remote node. |
| */ |
| int remote_node_defrag_ratio; |
| struct kmem_cache_node *node[MAX_NUMNODES]; |
| #endif |
| #ifdef CONFIG_SMP |
| struct kmem_cache_cpu *cpu_slab[NR_CPUS]; |
| #else |
| struct kmem_cache_cpu cpu_slab; |
| #endif |
| }; |
| |
| /* |
| * Kmalloc subsystem. |
| */ |
| #if defined(ARCH_KMALLOC_MINALIGN) && ARCH_KMALLOC_MINALIGN > 8 |
| #define KMALLOC_MIN_SIZE ARCH_KMALLOC_MINALIGN |
| #else |
| #define KMALLOC_MIN_SIZE 8 |
| #endif |
| |
| #define KMALLOC_SHIFT_LOW ilog2(KMALLOC_MIN_SIZE) |
| |
| /* |
| * Maximum kmalloc object size handled by SLUB. Larger object allocations |
| * are passed through to the page allocator. The page allocator "fastpath" |
| * is relatively slow so we need this value sufficiently high so that |
| * performance critical objects are allocated through the SLUB fastpath. |
| * |
| * This should be dropped to PAGE_SIZE / 2 once the page allocator |
| * "fastpath" becomes competitive with the slab allocator fastpaths. |
| */ |
| #define SLUB_MAX_SIZE (2 * PAGE_SIZE) |
| |
| #define SLUB_PAGE_SHIFT (PAGE_SHIFT + 2) |
| |
| /* |
| * We keep the general caches in an array of slab caches that are used for |
| * 2^x bytes of allocations. |
| */ |
| extern struct kmem_cache kmalloc_caches[SLUB_PAGE_SHIFT]; |
| |
| /* |
| * Sorry that the following has to be that ugly but some versions of GCC |
| * have trouble with constant propagation and loops. |
| */ |
| static __always_inline int kmalloc_index(size_t size) |
| { |
| if (!size) |
| return 0; |
| |
| if (size <= KMALLOC_MIN_SIZE) |
| return KMALLOC_SHIFT_LOW; |
| |
| #if KMALLOC_MIN_SIZE <= 64 |
| if (size > 64 && size <= 96) |
| return 1; |
| if (size > 128 && size <= 192) |
| return 2; |
| #endif |
| if (size <= 8) return 3; |
| if (size <= 16) return 4; |
| if (size <= 32) return 5; |
| if (size <= 64) return 6; |
| if (size <= 128) return 7; |
| if (size <= 256) return 8; |
| if (size <= 512) return 9; |
| if (size <= 1024) return 10; |
| if (size <= 2 * 1024) return 11; |
| if (size <= 4 * 1024) return 12; |
| /* |
| * The following is only needed to support architectures with a larger page |
| * size than 4k. |
| */ |
| if (size <= 8 * 1024) return 13; |
| if (size <= 16 * 1024) return 14; |
| if (size <= 32 * 1024) return 15; |
| if (size <= 64 * 1024) return 16; |
| if (size <= 128 * 1024) return 17; |
| if (size <= 256 * 1024) return 18; |
| if (size <= 512 * 1024) return 19; |
| if (size <= 1024 * 1024) return 20; |
| if (size <= 2 * 1024 * 1024) return 21; |
| return -1; |
| |
| /* |
| * What we really wanted to do and cannot do because of compiler issues is: |
| * int i; |
| * for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) |
| * if (size <= (1 << i)) |
| * return i; |
| */ |
| } |
| |
| /* |
| * Find the slab cache for a given combination of allocation flags and size. |
| * |
| * This ought to end up with a global pointer to the right cache |
| * in kmalloc_caches. |
| */ |
| static __always_inline struct kmem_cache *kmalloc_slab(size_t size) |
| { |
| int index = kmalloc_index(size); |
| |
| if (index == 0) |
| return NULL; |
| |
| return &kmalloc_caches[index]; |
| } |
| |
| #ifdef CONFIG_ZONE_DMA |
| #define SLUB_DMA __GFP_DMA |
| #else |
| /* Disable DMA functionality */ |
| #define SLUB_DMA (__force gfp_t)0 |
| #endif |
| |
| 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 *s, gfp_t gfpflags); |
| #else |
| static __always_inline void * |
| kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags) |
| { |
| return kmem_cache_alloc(s, gfpflags); |
| } |
| #endif |
| |
| static __always_inline void *kmalloc_large(size_t size, gfp_t flags) |
| { |
| unsigned int order = get_order(size); |
| void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order); |
| |
| trace_kmalloc(_THIS_IP_, ret, size, PAGE_SIZE << order, flags); |
| |
| return ret; |
| } |
| |
| static __always_inline void *kmalloc(size_t size, gfp_t flags) |
| { |
| void *ret; |
| |
| if (__builtin_constant_p(size)) { |
| if (size > SLUB_MAX_SIZE) |
| return kmalloc_large(size, flags); |
| |
| if (!(flags & SLUB_DMA)) { |
| struct kmem_cache *s = kmalloc_slab(size); |
| |
| if (!s) |
| return ZERO_SIZE_PTR; |
| |
| ret = kmem_cache_alloc_notrace(s, flags); |
| |
| trace_kmalloc(_THIS_IP_, ret, size, s->size, flags); |
| |
| return ret; |
| } |
| } |
| return __kmalloc(size, flags); |
| } |
| |
| #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); |
| |
| #ifdef CONFIG_KMEMTRACE |
| extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s, |
| gfp_t gfpflags, |
| int node); |
| #else |
| static __always_inline void * |
| kmem_cache_alloc_node_notrace(struct kmem_cache *s, |
| gfp_t gfpflags, |
| int node) |
| { |
| return kmem_cache_alloc_node(s, gfpflags, node); |
| } |
| #endif |
| |
| static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) |
| { |
| void *ret; |
| |
| if (__builtin_constant_p(size) && |
| size <= SLUB_MAX_SIZE && !(flags & SLUB_DMA)) { |
| struct kmem_cache *s = kmalloc_slab(size); |
| |
| if (!s) |
| return ZERO_SIZE_PTR; |
| |
| ret = kmem_cache_alloc_node_notrace(s, flags, node); |
| |
| trace_kmalloc_node(_THIS_IP_, ret, |
| size, s->size, flags, node); |
| |
| return ret; |
| } |
| return __kmalloc_node(size, flags, node); |
| } |
| #endif |
| |
| #endif /* _LINUX_SLUB_DEF_H */ |