Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / include / linux / zsmalloc.h
blob57a8e98f2708c8e65fb5433343c3a999d4f4dafc
1 /*
2 * zsmalloc memory allocator
4 * Copyright (C) 2011 Nitin Gupta
5 * Copyright (C) 2012, 2013 Minchan Kim
7 * This code is released using a dual license strategy: BSD/GPL
8 * You can choose the license that better fits your requirements.
10 * Released under the terms of 3-clause BSD License
11 * Released under the terms of GNU General Public License Version 2.0
14 #ifndef _ZS_MALLOC_H_
15 #define _ZS_MALLOC_H_
17 #include <linux/types.h>
20 * zsmalloc mapping modes
22 * NOTE: These only make a difference when a mapped object spans pages.
23 * They also have no effect when PGTABLE_MAPPING is selected.
25 enum 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) */
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.
37 struct zs_pool_stats {
38 /* How many pages were migrated (freed) */
39 unsigned long pages_compacted;
42 struct zs_pool;
44 struct zs_pool *zs_create_pool(const char *name);
45 void zs_destroy_pool(struct zs_pool *pool);
47 unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags);
48 void zs_free(struct zs_pool *pool, unsigned long obj);
50 void *zs_map_object(struct zs_pool *pool, unsigned long handle,
51 enum zs_mapmode mm);
52 void zs_unmap_object(struct zs_pool *pool, unsigned long handle);
54 unsigned long zs_get_total_pages(struct zs_pool *pool);
55 unsigned long zs_compact(struct zs_pool *pool);
57 void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats);
58 #endif