1 /* 2 * zsmalloc memory allocator 3 * 4 * Copyright (C) 2011 Nitin Gupta 5 * Copyright (C) 2012, 2013 Minchan Kim 6 * 7 * This code is released using a dual license strategy: BSD/GPL 8 * You can choose the license that better fits your requirements. 9 * 10 * Released under the terms of 3-clause BSD License 11 * Released under the terms of GNU General Public License Version 2.0 12 */ 13 14 #ifndef _ZS_MALLOC_H_ 15 #define _ZS_MALLOC_H_ 16 17 #include <linux/types.h> 18 19 /* 20 * zsmalloc mapping modes 21 * 22 * NOTE: These only make a difference when a mapped object spans pages. 23 */ 24 enum zs_mapmode { 25 ZS_MM_RW, /* normal read-write mapping */ 26 ZS_MM_RO, /* read-only (no copy-out at unmap time) */ 27 ZS_MM_WO /* write-only (no copy-in at map time) */ 28 /* 29 * NOTE: ZS_MM_WO should only be used for initializing new 30 * (uninitialized) allocations. Partial writes to already 31 * initialized allocations should use ZS_MM_RW to preserve the 32 * existing data. 33 */ 34 }; 35 36 struct zs_pool_stats { 37 /* How many pages were migrated (freed) */ 38 atomic_long_t pages_compacted; 39 }; 40 41 struct zs_pool; 42 43 struct zs_pool *zs_create_pool(const char *name); 44 void zs_destroy_pool(struct zs_pool *pool); 45 46 unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); 47 void zs_free(struct zs_pool *pool, unsigned long obj); 48 49 size_t zs_huge_class_size(struct zs_pool *pool); 50 51 void *zs_map_object(struct zs_pool *pool, unsigned long handle, 52 enum zs_mapmode mm); 53 void zs_unmap_object(struct zs_pool *pool, unsigned long handle); 54 55 unsigned long zs_get_total_pages(struct zs_pool *pool); 56 unsigned long zs_compact(struct zs_pool *pool); 57 58 void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); 59 #endif 60