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/kobject.h>
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 */
40 struct 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 #ifdef CONFIG_SLUB_CPU_PARTIAL
45 struct page
*partial
; /* Partially allocated frozen slabs */
47 #ifdef CONFIG_SLUB_STATS
48 unsigned stat
[NR_SLUB_STAT_ITEMS
];
52 #ifdef CONFIG_SLUB_CPU_PARTIAL
53 #define slub_percpu_partial(c) ((c)->partial)
55 #define slub_set_percpu_partial(c, p) \
57 slub_percpu_partial(c) = (p)->next; \
60 #define slub_percpu_partial_read_once(c) READ_ONCE(slub_percpu_partial(c))
62 #define slub_percpu_partial(c) NULL
64 #define slub_set_percpu_partial(c, p)
66 #define slub_percpu_partial_read_once(c) NULL
67 #endif // CONFIG_SLUB_CPU_PARTIAL
70 * Word size structure that can be atomically updated or read and that
71 * contains both the order and the number of objects that a slab of the
72 * given order would contain.
74 struct kmem_cache_order_objects
{
79 * Slab cache management.
82 struct kmem_cache_cpu __percpu
*cpu_slab
;
83 /* Used for retriving partial slabs etc */
85 unsigned long min_partial
;
86 int size
; /* The size of an object including meta data */
87 int object_size
; /* The size of an object without meta data */
88 int offset
; /* Free pointer offset. */
89 #ifdef CONFIG_SLUB_CPU_PARTIAL
90 int cpu_partial
; /* Number of per cpu partial objects to keep around */
92 struct kmem_cache_order_objects oo
;
94 /* Allocation and freeing of slabs */
95 struct kmem_cache_order_objects max
;
96 struct kmem_cache_order_objects min
;
97 gfp_t allocflags
; /* gfp flags to use on each alloc */
98 int refcount
; /* Refcount for slab cache destroy */
100 int inuse
; /* Offset to metadata */
101 int align
; /* Alignment */
102 int reserved
; /* Reserved bytes at the end of slabs */
103 int red_left_pad
; /* Left redzone padding size */
104 const char *name
; /* Name (only for display!) */
105 struct list_head list
; /* List of slab caches */
107 struct kobject kobj
; /* For sysfs */
108 struct work_struct kobj_remove_work
;
111 struct memcg_cache_params memcg_params
;
112 int max_attr_size
; /* for propagation, maximum size of a stored attr */
114 struct kset
*memcg_kset
;
120 * Defragmentation by allocating from a remote node.
122 int remote_node_defrag_ratio
;
125 #ifdef CONFIG_SLAB_FREELIST_RANDOM
126 unsigned int *random_seq
;
130 struct kasan_cache kasan_info
;
133 struct kmem_cache_node
*node
[MAX_NUMNODES
];
136 #ifdef CONFIG_SLUB_CPU_PARTIAL
137 #define slub_cpu_partial(s) ((s)->cpu_partial)
138 #define slub_set_cpu_partial(s, n) \
140 slub_cpu_partial(s) = (n); \
143 #define slub_cpu_partial(s) (0)
144 #define slub_set_cpu_partial(s, n)
145 #endif // CONFIG_SLUB_CPU_PARTIAL
148 #define SLAB_SUPPORTS_SYSFS
149 void sysfs_slab_release(struct kmem_cache
*);
151 static inline void sysfs_slab_release(struct kmem_cache
*s
)
156 void object_err(struct kmem_cache
*s
, struct page
*page
,
157 u8
*object
, char *reason
);
159 void *fixup_red_left(struct kmem_cache
*s
, void *p
);
161 static inline void *nearest_obj(struct kmem_cache
*cache
, struct page
*page
,
163 void *object
= x
- (x
- page_address(page
)) % cache
->size
;
164 void *last_object
= page_address(page
) +
165 (page
->objects
- 1) * cache
->size
;
166 void *result
= (unlikely(object
> last_object
)) ? last_object
: object
;
168 result
= fixup_red_left(cache
, result
);
172 #endif /* _LINUX_SLUB_DEF_H */