1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _LINUX_SLAB_DEF_H
3 #define _LINUX_SLAB_DEF_H
5 #include <linux/reciprocal_div.h>
8 * Definitions unique to the original Linux SLAB allocator.
12 struct array_cache __percpu *cpu_cache;
14 /* 1) Cache tunables. Protected by slab_mutex */
15 unsigned int batchcount;
20 struct reciprocal_value reciprocal_buffer_size;
21 /* 2) touched by every alloc & free from the backend */
23 slab_flags_t flags; /* constant flags */
24 unsigned int num; /* # of objs per slab */
26 /* 3) cache_grow/shrink */
27 /* order of pgs per slab (2^n) */
28 unsigned int gfporder;
30 /* force GFP flags, e.g. GFP_DMA */
33 size_t colour; /* cache colouring range */
34 unsigned int colour_off; /* colour offset */
35 struct kmem_cache *freelist_cache;
36 unsigned int freelist_size;
38 /* constructor func */
39 void (*ctor)(void *obj);
41 /* 4) cache creation/removal */
43 struct list_head list;
49 #ifdef CONFIG_DEBUG_SLAB
50 unsigned long num_active;
51 unsigned long num_allocations;
52 unsigned long high_mark;
56 unsigned long max_freeable;
57 unsigned long node_allocs;
58 unsigned long node_frees;
59 unsigned long node_overflow;
64 #ifdef CONFIG_DEBUG_SLAB_LEAK
65 atomic_t store_user_clean;
69 * If debugging is enabled, then the allocator can add additional
70 * fields and/or padding to every object. 'size' contains the total
71 * object size including these internal fields, while 'obj_offset'
72 * and 'object_size' contain the offset to the user object and its
76 #endif /* CONFIG_DEBUG_SLAB */
79 struct memcg_cache_params memcg_params;
82 struct kasan_cache kasan_info;
85 #ifdef CONFIG_SLAB_FREELIST_RANDOM
86 unsigned int *random_seq;
89 unsigned int useroffset; /* Usercopy region offset */
90 unsigned int usersize; /* Usercopy region size */
92 struct kmem_cache_node *node[MAX_NUMNODES];
95 static inline void *nearest_obj(struct kmem_cache *cache, struct page *page,
98 void *object = x - (x - page->s_mem) % cache->size;
99 void *last_object = page->s_mem + (cache->num - 1) * cache->size;
101 if (unlikely(object > last_object))
107 #endif /* _LINUX_SLAB_DEF_H */