zsmalloc.h 1.4 KB
Newer Older
1 2 3 4
/*
 * zsmalloc memory allocator
 *
 * Copyright (C) 2011  Nitin Gupta
M
Minchan Kim 已提交
5
 * Copyright (C) 2012, 2013 Minchan Kim
6 7 8 9 10 11 12 13 14 15 16 17 18
 *
 * 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>

19 20 21
/*
 * zsmalloc mapping modes
 *
N
Nitin Cupta 已提交
22 23
 * NOTE: These only make a difference when a mapped object spans pages.
 * They also have no effect when PGTABLE_MAPPING is selected.
24
 */
25 26 27 28
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) */
N
Nitin Cupta 已提交
29 30 31 32 33 34
	/*
	 * 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.
	 */
35 36
};

37 38
struct zs_pool;

39
struct zs_pool *zs_create_pool(gfp_t flags);
40 41
void zs_destroy_pool(struct zs_pool *pool);

42 43
unsigned long zs_malloc(struct zs_pool *pool, size_t size);
void zs_free(struct zs_pool *pool, unsigned long obj);
44

45 46
void *zs_map_object(struct zs_pool *pool, unsigned long handle,
			enum zs_mapmode mm);
47
void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
48

49
unsigned long zs_get_total_pages(struct zs_pool *pool);
50 51

#endif