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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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| 34 | |||
| 35 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
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| 36 | #define SLAB_MAG_SIZE 4 |
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| 37 | |||
| 38 | /** If object size is less, store control structure inside SLAB */ |
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| 39 | #define SLAB_INSIDE_SIZE (PAGE_SIZE / 6) |
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| 40 | |||
| 762 | palkovsky | 41 | /** Maximum wasted space we allow for cache */ |
| 42 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) / 4) |
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| 759 | palkovsky | 43 | |
| 44 | /* slab_reclaim constants */ |
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| 45 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
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| 46 | * we are in memory stress */ |
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| 47 | |||
| 48 | /* cache_create flags */ |
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| 49 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
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| 50 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
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| 51 | |||
| 52 | typedef struct { |
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| 53 | link_t link; |
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| 762 | palkovsky | 54 | count_t busy; /**< Count of full slots in magazine */ |
| 55 | count_t size; /**< Number of slots in magazine */ |
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| 56 | void *objs[0]; /**< Slots in magazine */ |
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| 759 | palkovsky | 57 | }slab_magazine_t; |
| 58 | |||
| 59 | typedef struct { |
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| 60 | char *name; |
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| 61 | |||
| 62 | SPINLOCK_DECLARE(lock); |
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| 63 | link_t link; |
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| 64 | /* Configuration */ |
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| 762 | palkovsky | 65 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
| 759 | palkovsky | 66 | int (*constructor)(void *obj, int kmflag); |
| 67 | void (*destructor)(void *obj); |
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| 762 | palkovsky | 68 | int flags; /**< Flags changing behaviour of cache */ |
| 759 | palkovsky | 69 | |
| 70 | /* Computed values */ |
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| 762 | palkovsky | 71 | __u8 order; /**< Order of frames to be allocated */ |
| 72 | int objects; /**< Number of objects that fit in */ |
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| 759 | palkovsky | 73 | |
| 74 | /* Statistics */ |
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| 75 | |||
| 76 | /* Slabs */ |
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| 762 | palkovsky | 77 | link_t full_slabs; /**< List of full slabs */ |
| 78 | link_t partial_slabs; /**< List of partial slabs */ |
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| 759 | palkovsky | 79 | /* Magazines */ |
| 762 | palkovsky | 80 | link_t magazines; /**< List o full magazines */ |
| 81 | |||
| 82 | /** CPU cache */ |
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| 759 | palkovsky | 83 | struct { |
| 84 | slab_magazine_t *current; |
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| 85 | slab_magazine_t *last; |
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| 86 | SPINLOCK_DECLARE(lock); |
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| 87 | }mag_cache[0]; |
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| 88 | }slab_cache_t; |
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| 89 | |||
| 762 | palkovsky | 90 | extern slab_cache_t * slab_cache_create(char *name, |
| 91 | size_t size, |
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| 92 | size_t align, |
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| 93 | int (*constructor)(void *obj, int kmflag), |
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| 94 | void (*destructor)(void *obj), |
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| 95 | int flags); |
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| 96 | extern void slab_cache_destroy(slab_cache_t *cache); |
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| 759 | palkovsky | 97 | |
| 762 | palkovsky | 98 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
| 99 | extern void slab_free(slab_cache_t *cache, void *obj); |
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| 100 | extern count_t slab_reclaim(int flags); |
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| 759 | palkovsky | 101 | |
| 102 | /** Initialize SLAB subsytem */ |
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| 762 | palkovsky | 103 | extern void slab_cache_init(void); |
| 759 | palkovsky | 104 | |
| 105 | /* KConsole debug */ |
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| 762 | palkovsky | 106 | extern void slab_print_list(void); |
| 759 | palkovsky | 107 | |
| 108 | #endif |