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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 #include <linux/compiler.h>
  9 
 10 struct kmem_cache;
 11 
 12 typedef void * (mempool_alloc_t)(gfp_t gfp_mask, void *pool_data);
 13 typedef void (mempool_free_t)(void *element, void *pool_data);
 14 
 15 typedef 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 
 27 extern mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
 28                         mempool_free_t *free_fn, void *pool_data);
 29 extern 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 
 33 extern int mempool_resize(mempool_t *pool, int new_min_nr);
 34 extern void mempool_destroy(mempool_t *pool);
 35 extern void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask) __malloc;
 36 extern 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  */
 43 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data);
 44 void mempool_free_slab(void *element, void *pool_data);
 45 static inline mempool_t *
 46 mempool_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  */
 56 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data);
 57 void mempool_kfree(void *element, void *pool_data);
 58 static 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  */
 68 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data);
 69 void mempool_free_pages(void *element, void *pool_data);
 70 static 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 */
 77 

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