Linux kernel mirror (for testing)
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linux
1/*
2 * memory buffer pool support
3 */
4#ifndef _LINUX_MEMPOOL_H
5#define _LINUX_MEMPOOL_H
6
7#include <linux/wait.h>
8
9struct kmem_cache;
10
11typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
12typedef void (mempool_free_t)(void *element, void *pool_data);
13
14typedef struct mempool_s {
15 spinlock_t lock;
16 int min_nr; /* nr of elements at *elements */
17 int curr_nr; /* Current nr of elements at *elements */
18 void **elements;
19
20 void *pool_data;
21 mempool_alloc_t *alloc;
22 mempool_free_t *free;
23 wait_queue_head_t wait;
24} mempool_t;
25
26extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
27 mempool_free_t *free_fn, void *pool_data);
28extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
29 mempool_free_t *free_fn, void *pool_data,
30 gfp_t gfp_mask, int nid);
31
32extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask);
33extern void mempool_destroy(mempool_t *pool);
34extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
35extern void mempool_free(void *element, mempool_t *pool);
36
37/*
38 * A mempool_alloc_t and mempool_free_t that get the memory from
39 * a slab that is passed in through pool_data.
40 */
41void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
42void mempool_free_slab(void *element, void *pool_data);
43static inline mempool_t *
44mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
45{
46 return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
47 (void *) kc);
48}
49
50/*
51 * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
52 * amount of memory specified by pool_data
53 */
54void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
55void mempool_kfree(void *element, void *pool_data);
56static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
57{
58 return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
59 (void *) size);
60}
61
62/*
63 * A mempool_alloc_t and mempool_free_t for a simple page allocator that
64 * allocates pages of the order specified by pool_data
65 */
66void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
67void mempool_free_pages(void *element, void *pool_data);
68static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
69{
70 return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
71 (void *)(long)order);
72}
73
74#endif /* _LINUX_MEMPOOL_H */