/* * zsmalloc memory allocator * * Copyright (C) 2011 Nitin Gupta * Copyright (C) 2012, 2013 Minchan Kim * * This code is released using a dual license strategy: BSD/GPL * You can choose the license that better fits your requirements. * * Released under the terms of 3-clause BSD License * Released under the terms of GNU General Public License Version 2.0 */ #ifndef _ZS_MALLOC_H_ #define _ZS_MALLOC_H_ #include <linux/types.h> /* * zsmalloc mapping modes * * NOTE: These only make a difference when a mapped object spans pages. * They also have no effect when PGTABLE_MAPPING is selected. */ enum zs_mapmode { ZS_MM_RW, /* normal read-write mapping */ ZS_MM_RO, /* read-only (no copy-out at unmap time) */ ZS_MM_WO /* write-only (no copy-in at map time) */ /* * NOTE: ZS_MM_WO should only be used for initializing new * (uninitialized) allocations. Partial writes to already * initialized allocations should use ZS_MM_RW to preserve the * existing data. */ }; struct zs_pool_stats { /* How many pages were migrated (freed) */ unsigned long pages_compacted; }; struct zs_pool; struct zs_pool *zs_create_pool(const char *name); void zs_destroy_pool(struct zs_pool *pool); unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); void zs_free(struct zs_pool *pool, unsigned long obj); void *zs_map_object(struct zs_pool *pool, unsigned long handle, enum zs_mapmode mm); void zs_unmap_object(struct zs_pool *pool, unsigned long handle); unsigned long zs_get_total_pages(struct zs_pool *pool); unsigned long zs_compact(struct zs_pool *pool); void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); #endif