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 * They also have no effect when PGTABLE_MAPPING is selected. 24 */ 25enum zs_mapmode { 26 ZS_MM_RW, /* normal read-write mapping */ 27 ZS_MM_RO, /* read-only (no copy-out at unmap time) */ 28 ZS_MM_WO /* write-only (no copy-in at map time) */ 29 /* 30 * NOTE: ZS_MM_WO should only be used for initializing new 31 * (uninitialized) allocations. Partial writes to already 32 * initialized allocations should use ZS_MM_RW to preserve the 33 * existing data. 34 */ 35}; 36 37struct zs_pool_stats { 38 /* How many pages were migrated (freed) */ 39 unsigned long pages_compacted; 40}; 41 42struct zs_pool; 43 44struct zs_pool *zs_create_pool(const char *name, gfp_t flags); 45void zs_destroy_pool(struct zs_pool *pool); 46 47unsigned long zs_malloc(struct zs_pool *pool, size_t size); 48void zs_free(struct zs_pool *pool, unsigned long obj); 49 50void *zs_map_object(struct zs_pool *pool, unsigned long handle, 51 enum zs_mapmode mm); 52void zs_unmap_object(struct zs_pool *pool, unsigned long handle); 53 54unsigned long zs_get_total_pages(struct zs_pool *pool); 55unsigned long zs_compact(struct zs_pool *pool); 56 57void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); 58#endif 59