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TOMOYO Linux Cross Reference
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 
  9 struct kmem_cache;
 10 
 11 typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
 12 typedef void (mempool_free_t)(void *element, void *pool_data);
 13 
 14 typedef 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 
 26 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
 27                         mempool_free_t *free_fn, void *pool_data);
 28 extern 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 
 32 extern int mempool_resize(mempool_t *pool, int new_min_nr);
 33 extern void mempool_destroy(mempool_t *pool);
 34 extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask);
 35 extern 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 cache that is passed in through pool_data.
 40  * Note: the slab cache may not have a ctor function.
 41  */
 42 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
 43 void mempool_free_slab(void *element, void *pool_data);
 44 static inline mempool_t *
 45 mempool_create_slab_pool(int min_nr, struct kmem_cache *kc)
 46 {
 47         return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab,
 48                               (void *) kc);
 49 }
 50 
 51 /*
 52  * a mempool_alloc_t and a mempool_free_t to kmalloc and kfree the
 53  * amount of memory specified by pool_data
 54  */
 55 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
 56 void mempool_kfree(void *element, void *pool_data);
 57 static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
 58 {
 59         return mempool_create(min_nr, mempool_kmalloc, mempool_kfree,
 60                               (void *) size);
 61 }
 62 
 63 /*
 64  * A mempool_alloc_t and mempool_free_t for a simple page allocator that
 65  * allocates pages of the order specified by pool_data
 66  */
 67 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
 68 void mempool_free_pages(void *element, void *pool_data);
 69 static inline mempool_t *mempool_create_page_pool(int min_nr, int order)
 70 {
 71         return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages,
 72                               (void *)(long)order);
 73 }
 74 
 75 #endif /* _LINUX_MEMPOOL_H */
 76 

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