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* 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 ZSMALLOC_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);
size_t zs_huge_class_size(struct zs_pool *pool);
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);