| 1 | /* |
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| 2 | * zsmalloc memory allocator |
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| 3 | * |
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| 4 | * Copyright (C) 2011 Nitin Gupta |
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| 5 | * Copyright (C) 2012, 2013 Minchan Kim |
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| 6 | * |
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| 7 | * This code is released using a dual license strategy: BSD/GPL |
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| 8 | * You can choose the license that better fits your requirements. |
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| 9 | * |
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| 10 | * Released under the terms of 3-clause BSD License |
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| 11 | * Released under the terms of GNU General Public License Version 2.0 |
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| 12 | */ |
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| 13 | |
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| 14 | #ifndef _ZS_MALLOC_H_ |
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| 15 | #define _ZS_MALLOC_H_ |
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| 16 | |
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| 17 | #include <linux/types.h> |
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| 18 | |
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| 19 | /* |
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| 20 | * zsmalloc mapping modes |
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| 21 | * |
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| 22 | * NOTE: These only make a difference when a mapped object spans pages. |
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| 23 | */ |
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| 24 | enum zs_mapmode { |
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| 25 | ZS_MM_RW, /* normal read-write mapping */ |
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| 26 | ZS_MM_RO, /* read-only (no copy-out at unmap time) */ |
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| 27 | ZS_MM_WO /* write-only (no copy-in at map time) */ |
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| 28 | /* |
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| 29 | * NOTE: ZS_MM_WO should only be used for initializing new |
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| 30 | * (uninitialized) allocations. Partial writes to already |
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| 31 | * initialized allocations should use ZS_MM_RW to preserve the |
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| 32 | * existing data. |
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| 33 | */ |
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| 34 | }; |
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| 35 | |
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| 36 | struct zs_pool_stats { |
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| 37 | /* How many pages were migrated (freed) */ |
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| 38 | atomic_long_t pages_compacted; |
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| 39 | }; |
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| 40 | |
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| 41 | struct zs_pool; |
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| 42 | |
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| 43 | struct zs_pool *zs_create_pool(const char *name); |
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| 44 | void zs_destroy_pool(struct zs_pool *pool); |
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| 45 | |
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| 46 | unsigned long zs_malloc(struct zs_pool *pool, size_t size, gfp_t flags); |
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| 47 | void zs_free(struct zs_pool *pool, unsigned long obj); |
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| 48 | |
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| 49 | size_t zs_huge_class_size(struct zs_pool *pool); |
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| 50 | |
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| 51 | void *zs_map_object(struct zs_pool *pool, unsigned long handle, |
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| 52 | enum zs_mapmode mm); |
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| 53 | void zs_unmap_object(struct zs_pool *pool, unsigned long handle); |
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| 54 | |
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| 55 | unsigned long zs_get_total_pages(struct zs_pool *pool); |
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| 56 | unsigned long zs_compact(struct zs_pool *pool); |
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| 57 | |
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| 58 | unsigned int zs_lookup_class_index(struct zs_pool *pool, unsigned int size); |
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| 59 | |
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| 60 | void zs_pool_stats(struct zs_pool *pool, struct zs_pool_stats *stats); |
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| 61 | #endif |
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| 62 | |
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