1 #ifndef _LINUX_SLUB_DEF_H
2 #define _LINUX_SLUB_DEF_H
5 * SLUB : A Slab allocator without object queues.
7 * (C) 2007 SGI, Christoph Lameter
9 #include <linux/types.h>
10 #include <linux/gfp.h>
11 #include <linux/bug.h>
12 #include <linux/workqueue.h>
13 #include <linux/kobject.h>
15 #include <linux/kmemleak.h>
18 ALLOC_FASTPATH, /* Allocation from cpu slab */
19 ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
20 FREE_FASTPATH, /* Free to cpu slub */
21 FREE_SLOWPATH, /* Freeing not to cpu slab */
22 FREE_FROZEN, /* Freeing to frozen slab */
23 FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
24 FREE_REMOVE_PARTIAL, /* Freeing removes last object */
25 ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
26 ALLOC_SLAB, /* Cpu slab acquired from page allocator */
27 ALLOC_REFILL, /* Refill cpu slab from slab freelist */
28 ALLOC_NODE_MISMATCH, /* Switching cpu slab */
29 FREE_SLAB, /* Slab freed to the page allocator */
30 CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
31 DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
32 DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
33 DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
34 DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
35 DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
36 DEACTIVATE_BYPASS, /* Implicit deactivation */
37 ORDER_FALLBACK, /* Number of times fallback was necessary */
38 CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
39 CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
40 CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
41 CPU_PARTIAL_FREE, /* Refill cpu partial on free */
42 CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
43 CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
46 struct kmem_cache_cpu {
47 void **freelist; /* Pointer to next available object */
48 unsigned long tid; /* Globally unique transaction id */
49 struct page *page; /* The slab from which we are allocating */
50 struct page *partial; /* Partially allocated frozen slabs */
51 #ifdef CONFIG_SLUB_STATS
52 unsigned stat[NR_SLUB_STAT_ITEMS];
57 * Word size structure that can be atomically updated or read and that
58 * contains both the order and the number of objects that a slab of the
59 * given order would contain.
61 struct kmem_cache_order_objects {
66 * Slab cache management.
69 struct kmem_cache_cpu __percpu *cpu_slab;
70 /* Used for retriving partial slabs etc */
72 unsigned long min_partial;
73 int size; /* The size of an object including meta data */
74 int object_size; /* The size of an object without meta data */
75 int offset; /* Free pointer offset. */
76 int cpu_partial; /* Number of per cpu partial objects to keep around */
77 struct kmem_cache_order_objects oo;
79 /* Allocation and freeing of slabs */
80 struct kmem_cache_order_objects max;
81 struct kmem_cache_order_objects min;
82 gfp_t allocflags; /* gfp flags to use on each alloc */
83 int refcount; /* Refcount for slab cache destroy */
85 int inuse; /* Offset to metadata */
86 int align; /* Alignment */
87 int reserved; /* Reserved bytes at the end of slabs */
88 const char *name; /* Name (only for display!) */
89 struct list_head list; /* List of slab caches */
91 struct kobject kobj; /* For sysfs */
93 #ifdef CONFIG_MEMCG_KMEM
94 struct memcg_cache_params *memcg_params;
95 int max_attr_size; /* for propagation, maximum size of a stored attr */
100 * Defragmentation by allocating from a remote node.
102 int remote_node_defrag_ratio;
104 struct kmem_cache_node *node[MAX_NUMNODES];
107 void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
108 void *__kmalloc(size_t size, gfp_t flags);
110 static __always_inline void *
111 kmalloc_order(size_t size, gfp_t flags, unsigned int order)
115 flags |= (__GFP_COMP | __GFP_KMEMCG);
116 ret = (void *) __get_free_pages(flags, order);
117 kmemleak_alloc(ret, size, 1, flags);
122 * Calling this on allocated memory will check that the memory
123 * is expected to be in use, and print warnings if not.
125 #ifdef CONFIG_SLUB_DEBUG
126 extern bool verify_mem_not_deleted(const void *x);
128 static inline bool verify_mem_not_deleted(const void *x)
134 #ifdef CONFIG_TRACING
136 kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size);
137 extern void *kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order);
139 static __always_inline void *
140 kmem_cache_alloc_trace(struct kmem_cache *s, gfp_t gfpflags, size_t size)
142 return kmem_cache_alloc(s, gfpflags);
145 static __always_inline void *
146 kmalloc_order_trace(size_t size, gfp_t flags, unsigned int order)
148 return kmalloc_order(size, flags, order);
152 static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
154 unsigned int order = get_order(size);
155 return kmalloc_order_trace(size, flags, order);
158 static __always_inline void *kmalloc(size_t size, gfp_t flags)
160 if (__builtin_constant_p(size)) {
161 if (size > KMALLOC_MAX_CACHE_SIZE)
162 return kmalloc_large(size, flags);
164 if (!(flags & GFP_DMA)) {
165 int index = kmalloc_index(size);
168 return ZERO_SIZE_PTR;
170 return kmem_cache_alloc_trace(kmalloc_caches[index],
174 return __kmalloc(size, flags);
178 void *__kmalloc_node(size_t size, gfp_t flags, int node);
179 void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
181 #ifdef CONFIG_TRACING
182 extern void *kmem_cache_alloc_node_trace(struct kmem_cache *s,
184 int node, size_t size);
186 static __always_inline void *
187 kmem_cache_alloc_node_trace(struct kmem_cache *s,
189 int node, size_t size)
191 return kmem_cache_alloc_node(s, gfpflags, node);
195 static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
197 if (__builtin_constant_p(size) &&
198 size <= KMALLOC_MAX_CACHE_SIZE && !(flags & GFP_DMA)) {
199 int index = kmalloc_index(size);
202 return ZERO_SIZE_PTR;
204 return kmem_cache_alloc_node_trace(kmalloc_caches[index],
207 return __kmalloc_node(size, flags, node);
211 #endif /* _LINUX_SLUB_DEF_H */