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| Rev | Author | Line No. | Line |
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| 759 | palkovsky | 1 | /* |
| 762 | palkovsky | 2 | * Copyright (C) 2006 Ondrej Palkovsky |
| 759 | palkovsky | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 29 | #ifndef __SLAB_H__ |
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| 30 | #define __SLAB_H__ |
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| 31 | |||
| 32 | #include <list.h> |
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| 33 | #include <synch/spinlock.h> |
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| 764 | palkovsky | 34 | #include <arch/atomic.h> |
| 759 | palkovsky | 35 | |
| 771 | palkovsky | 36 | /** Minimum size to be allocated by malloc */ |
| 37 | #define SLAB_MIN_MALLOC_W 3 |
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| 38 | |||
| 39 | /** Maximum size to be allocated by malloc */ |
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| 40 | #define SLAB_MAX_MALLOC_W 17 |
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| 41 | |||
| 759 | palkovsky | 42 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
| 43 | #define SLAB_MAG_SIZE 4 |
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| 44 | |||
| 45 | /** If object size is less, store control structure inside SLAB */ |
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| 766 | palkovsky | 46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
| 759 | palkovsky | 47 | |
| 762 | palkovsky | 48 | /** Maximum wasted space we allow for cache */ |
| 771 | palkovsky | 49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2) |
| 759 | palkovsky | 50 | |
| 51 | /* slab_reclaim constants */ |
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| 52 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
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| 53 | * we are in memory stress */ |
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| 54 | |||
| 55 | /* cache_create flags */ |
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| 56 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
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| 57 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
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| 58 | |||
| 59 | typedef struct { |
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| 60 | link_t link; |
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| 762 | palkovsky | 61 | count_t busy; /**< Count of full slots in magazine */ |
| 62 | count_t size; /**< Number of slots in magazine */ |
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| 63 | void *objs[0]; /**< Slots in magazine */ |
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| 759 | palkovsky | 64 | }slab_magazine_t; |
| 65 | |||
| 66 | typedef struct { |
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| 67 | char *name; |
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| 68 | |||
| 69 | SPINLOCK_DECLARE(lock); |
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| 70 | link_t link; |
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| 71 | /* Configuration */ |
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| 762 | palkovsky | 72 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
| 759 | palkovsky | 73 | int (*constructor)(void *obj, int kmflag); |
| 74 | void (*destructor)(void *obj); |
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| 762 | palkovsky | 75 | int flags; /**< Flags changing behaviour of cache */ |
| 759 | palkovsky | 76 | |
| 77 | /* Computed values */ |
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| 762 | palkovsky | 78 | __u8 order; /**< Order of frames to be allocated */ |
| 79 | int objects; /**< Number of objects that fit in */ |
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| 759 | palkovsky | 80 | |
| 81 | /* Statistics */ |
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| 764 | palkovsky | 82 | atomic_t allocated_slabs; |
| 83 | atomic_t allocated_objs; |
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| 767 | palkovsky | 84 | atomic_t cached_objs; |
| 759 | palkovsky | 85 | |
| 86 | /* Slabs */ |
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| 762 | palkovsky | 87 | link_t full_slabs; /**< List of full slabs */ |
| 88 | link_t partial_slabs; /**< List of partial slabs */ |
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| 759 | palkovsky | 89 | /* Magazines */ |
| 762 | palkovsky | 90 | link_t magazines; /**< List o full magazines */ |
| 91 | |||
| 92 | /** CPU cache */ |
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| 759 | palkovsky | 93 | struct { |
| 94 | slab_magazine_t *current; |
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| 95 | slab_magazine_t *last; |
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| 96 | SPINLOCK_DECLARE(lock); |
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| 97 | }mag_cache[0]; |
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| 98 | }slab_cache_t; |
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| 99 | |||
| 762 | palkovsky | 100 | extern slab_cache_t * slab_cache_create(char *name, |
| 101 | size_t size, |
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| 102 | size_t align, |
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| 103 | int (*constructor)(void *obj, int kmflag), |
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| 104 | void (*destructor)(void *obj), |
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| 105 | int flags); |
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| 106 | extern void slab_cache_destroy(slab_cache_t *cache); |
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| 759 | palkovsky | 107 | |
| 762 | palkovsky | 108 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
| 109 | extern void slab_free(slab_cache_t *cache, void *obj); |
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| 110 | extern count_t slab_reclaim(int flags); |
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| 759 | palkovsky | 111 | |
| 112 | /** Initialize SLAB subsytem */ |
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| 762 | palkovsky | 113 | extern void slab_cache_init(void); |
| 759 | palkovsky | 114 | |
| 115 | /* KConsole debug */ |
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| 762 | palkovsky | 116 | extern void slab_print_list(void); |
| 759 | palkovsky | 117 | |
| 771 | palkovsky | 118 | /* Malloc support */ |
| 119 | extern void * kalloc(unsigned int size, int flags); |
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| 120 | extern void kfree(void *obj); |
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| 121 | |||
| 759 | palkovsky | 122 | #endif |