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, int nid); 30 31 extern int mempool_resize(mempool_t *pool, int new_min_nr, gfp_t gfp_mask); 32 extern void mempool_destroy(mempool_t *pool); 33 extern void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask); 34 extern void mempool_free(void *element, mempool_t *pool); 35 36 /* 37 * A mempool_alloc_t and mempool_free_t that get the memory from 38 * a slab that is passed in through pool_data. 39 */ 40 void *mempool_alloc_slab(gfp_t gfp_mask, void *pool_data); 41 void mempool_free_slab(void *element, void *pool_data); 42 static inline mempool_t * 43 mempool_create_slab_pool(int min_nr, struct kmem_cache *kc) 44 { 45 return mempool_create(min_nr, mempool_alloc_slab, mempool_free_slab, 46 (void *) kc); 47 } 48 49 /* 50 * 2 mempool_alloc_t's and a mempool_free_t to kmalloc/kzalloc and kfree 51 * the amount of memory specified by pool_data 52 */ 53 void *mempool_kmalloc(gfp_t gfp_mask, void *pool_data); 54 void *mempool_kzalloc(gfp_t gfp_mask, void *pool_data); 55 void mempool_kfree(void *element, void *pool_data); 56 static 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 static inline mempool_t *mempool_create_kzalloc_pool(int min_nr, size_t size) 62 { 63 return mempool_create(min_nr, mempool_kzalloc, mempool_kfree, 64 (void *) size); 65 } 66 67 /* 68 * A mempool_alloc_t and mempool_free_t for a simple page allocator that 69 * allocates pages of the order specified by pool_data 70 */ 71 void *mempool_alloc_pages(gfp_t gfp_mask, void *pool_data); 72 void mempool_free_pages(void *element, void *pool_data); 73 static inline mempool_t *mempool_create_page_pool(int min_nr, int order) 74 { 75 return mempool_create(min_nr, mempool_alloc_pages, mempool_free_pages, 76 (void *)(long)order); 77 } 78 79 #endif /* _LINUX_MEMPOOL_H */ 80
