linux/include/linux/mempool.h
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   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 */
  75
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