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61989a80 NG |
1 | /* |
2 | * zsmalloc memory allocator | |
3 | * | |
4 | * Copyright (C) 2011 Nitin Gupta | |
31fc00bb | 5 | * Copyright (C) 2012, 2013 Minchan Kim |
61989a80 NG |
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 | ||
b7418510 SJ |
19 | /* |
20 | * zsmalloc mapping modes | |
21 | * | |
c3e3e88a NC |
22 | * NOTE: These only make a difference when a mapped object spans pages. |
23 | * They also have no effect when PGTABLE_MAPPING is selected. | |
396b7fd6 | 24 | */ |
b7418510 SJ |
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) */ | |
c3e3e88a NC |
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 | */ | |
b7418510 SJ |
35 | }; |
36 | ||
7d3f3938 | 37 | struct zs_pool_stats { |
860c707d SS |
38 | /* How many pages were migrated (freed) */ |
39 | unsigned long pages_compacted; | |
7d3f3938 SS |
40 | }; |
41 | ||
61989a80 NG |
42 | struct zs_pool; |
43 | ||
d0d8da2d | 44 | struct zs_pool *zs_create_pool(const char *name); |
61989a80 NG |
45 | void zs_destroy_pool(struct zs_pool *pool); |
46 | ||
d0d8da2d | 47 | unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); |
c2344348 | 48 | void zs_free(struct zs_pool *pool, unsigned long obj); |
61989a80 | 49 | |
7f47f23b SS |
50 | size_t zs_huge_class_size(struct zs_pool *pool); |
51 | ||
b7418510 SJ |
52 | void *zs_map_object(struct zs_pool *pool, unsigned long handle, |
53 | enum zs_mapmode mm); | |
c2344348 | 54 | void zs_unmap_object(struct zs_pool *pool, unsigned long handle); |
61989a80 | 55 | |
722cdc17 | 56 | unsigned long zs_get_total_pages(struct zs_pool *pool); |
312fcae2 | 57 | unsigned long zs_compact(struct zs_pool *pool); |
61989a80 | 58 | |
7d3f3938 | 59 | void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); |
61989a80 | 60 | #endif |