Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
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#include <linux/compiler.h>
9
10struct kmem_cache;
11
12typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
13typedef void (mempool_free_t)(void *element, void *pool_data);
14
15typedef struct mempool_s {
16 spinlock_t lock;
17 int min_nr; /* nr of elements at *elements */
18 int curr_nr; /* Current nr of elements at *elements */
19 void **elements;
20
21 void *pool_data;
22 mempool_alloc_t *alloc;
23 mempool_free_t *free;
24 wait_queue_head_t wait;
25} mempool_t;
26
27extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
28 mempool_free_t *free_fn, void *pool_data);
29extern mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
30 mempool_free_t *free_fn, void *pool_data,
31 gfp_t gfp_mask, int nid);
32
33extern int mempool_resize(mempool_t *pool, int new_min_nr);
34extern void mempool_destroy(mempool_t *pool);
35extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
36extern void mempool_free(void *element, mempool_t *pool);
37
38/*
39 * A mempool_alloc_t and mempool_free_t that get the memory from
40 * a slab cache that is passed in through pool_data.
41 * Note: the slab cache may not have a ctor function.
42 */
43void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
44void mempool_free_slab(void *element, void *pool_data);
45static inline mempool_t *
46mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
47{
48 return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
49 (void *) kc);
50}
51
52/*
53 * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
54 * amount of memory specified by pool_data
55 */
56void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
57void mempool_kfree(void *element, void *pool_data);
58static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
59{
60 return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
61 (void *) size);
62}
63
64/*
65 * A mempool_alloc_t and mempool_free_t for a simple page allocator that
66 * allocates pages of the order specified by pool_data
67 */
68void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
69void mempool_free_pages(void *element, void *pool_data);
70static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
71{
72 return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
73 (void *)(long)order);
74}
75
76#endif /* _LINUX_MEMPOOL_H */