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1#ifndef _LINUX_SLUB_DEF_H
2#define _LINUX_SLUB_DEF_H
3
4/*
5 * SLUB : A Slab allocator without object queues.
6 *
7 * (C) 2007 SGI, Christoph Lameter
8 */
9#include <linux/kobject.h>
10
11enum stat_item {
12 ALLOC_FASTPATH, /* Allocation from cpu slab */
13 ALLOC_SLOWPATH, /* Allocation by getting a new cpu slab */
14 FREE_FASTPATH, /* Free to cpu slab */
15 FREE_SLOWPATH, /* Freeing not to cpu slab */
16 FREE_FROZEN, /* Freeing to frozen slab */
17 FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */
18 FREE_REMOVE_PARTIAL, /* Freeing removes last object */
19 ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */
20 ALLOC_SLAB, /* Cpu slab acquired from page allocator */
21 ALLOC_REFILL, /* Refill cpu slab from slab freelist */
22 ALLOC_NODE_MISMATCH, /* Switching cpu slab */
23 FREE_SLAB, /* Slab freed to the page allocator */
24 CPUSLAB_FLUSH, /* Abandoning of the cpu slab */
25 DEACTIVATE_FULL, /* Cpu slab was full when deactivated */
26 DEACTIVATE_EMPTY, /* Cpu slab was empty when deactivated */
27 DEACTIVATE_TO_HEAD, /* Cpu slab was moved to the head of partials */
28 DEACTIVATE_TO_TAIL, /* Cpu slab was moved to the tail of partials */
29 DEACTIVATE_REMOTE_FREES,/* Slab contained remotely freed objects */
30 DEACTIVATE_BYPASS, /* Implicit deactivation */
31 ORDER_FALLBACK, /* Number of times fallback was necessary */
32 CMPXCHG_DOUBLE_CPU_FAIL,/* Failure of this_cpu_cmpxchg_double */
33 CMPXCHG_DOUBLE_FAIL, /* Number of times that cmpxchg double did not match */
34 CPU_PARTIAL_ALLOC, /* Used cpu partial on alloc */
35 CPU_PARTIAL_FREE, /* Refill cpu partial on free */
36 CPU_PARTIAL_NODE, /* Refill cpu partial from node partial */
37 CPU_PARTIAL_DRAIN, /* Drain cpu partial to node partial */
38 NR_SLUB_STAT_ITEMS };
39
40struct kmem_cache_cpu {
41 void **freelist; /* Pointer to next available object */
42 unsigned long tid; /* Globally unique transaction id */
43 struct page *page; /* The slab from which we are allocating */
44 struct page *partial; /* Partially allocated frozen slabs */
45#ifdef CONFIG_SLUB_STATS
46 unsigned stat[NR_SLUB_STAT_ITEMS];
47#endif
48};
49
50/*
51 * Word size structure that can be atomically updated or read and that
52 * contains both the order and the number of objects that a slab of the
53 * given order would contain.
54 */
55struct kmem_cache_order_objects {
56 unsigned long x;
57};
58
59/*
60 * Slab cache management.
61 */
62struct kmem_cache {
63 struct kmem_cache_cpu __percpu *cpu_slab;
64 /* Used for retriving partial slabs etc */
65 unsigned long flags;
66 unsigned long min_partial;
67 int size; /* The size of an object including meta data */
68 int object_size; /* The size of an object without meta data */
69 int offset; /* Free pointer offset. */
70 int cpu_partial; /* Number of per cpu partial objects to keep around */
71 struct kmem_cache_order_objects oo;
72
73 /* Allocation and freeing of slabs */
74 struct kmem_cache_order_objects max;
75 struct kmem_cache_order_objects min;
76 gfp_t allocflags; /* gfp flags to use on each alloc */
77 int refcount; /* Refcount for slab cache destroy */
78 void (*ctor)(void *);
79 int inuse; /* Offset to metadata */
80 int align; /* Alignment */
81 int reserved; /* Reserved bytes at the end of slabs */
82 const char *name; /* Name (only for display!) */
83 struct list_head list; /* List of slab caches */
84 int red_left_pad; /* Left redzone padding size */
85#ifdef CONFIG_SYSFS
86 struct kobject kobj; /* For sysfs */
87#endif
88#ifdef CONFIG_MEMCG
89 struct memcg_cache_params memcg_params;
90 int max_attr_size; /* for propagation, maximum size of a stored attr */
91#ifdef CONFIG_SYSFS
92 struct kset *memcg_kset;
93#endif
94#endif
95
96#ifdef CONFIG_NUMA
97 /*
98 * Defragmentation by allocating from a remote node.
99 */
100 int remote_node_defrag_ratio;
101#endif
102
103#ifdef CONFIG_SLAB_FREELIST_RANDOM
104 unsigned int *random_seq;
105#endif
106
107#ifdef CONFIG_KASAN
108 struct kasan_cache kasan_info;
109#endif
110
111 struct kmem_cache_node *node[MAX_NUMNODES];
112};
113
114#ifdef CONFIG_SYSFS
115#define SLAB_SUPPORTS_SYSFS
116void sysfs_slab_remove(struct kmem_cache *);
117#else
118static inline void sysfs_slab_remove(struct kmem_cache *s)
119{
120}
121#endif
122
123void object_err(struct kmem_cache *s, struct page *page,
124 u8 *object, char *reason);
125
126void *fixup_red_left(struct kmem_cache *s, void *p);
127
128static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
129 void *x) {
130 void *object = x - (x - page_address(page)) % cache->size;
131 void *last_object = page_address(page) +
132 (page->objects - 1) * cache->size;
133 void *result = (unlikely(object > last_object)) ? last_object : object;
134
135 result = fixup_red_left(cache, result);
136 return result;
137}
138
139#endif /* _LINUX_SLUB_DEF_H */