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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 | |
36 | /** Initial Magazine size (TODO: dynamically growing magazines) */ |
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37 | #define SLAB_MAG_SIZE 4 |
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38 | |||
39 | /** If object size is less, store control structure inside SLAB */ |
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766 | palkovsky | 40 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3) |
759 | palkovsky | 41 | |
762 | palkovsky | 42 | /** Maximum wasted space we allow for cache */ |
766 | palkovsky | 43 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order >> 2)) |
759 | palkovsky | 44 | |
45 | /* slab_reclaim constants */ |
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46 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because |
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47 | * we are in memory stress */ |
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48 | |||
49 | /* cache_create flags */ |
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50 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */ |
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51 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */ |
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52 | |||
53 | typedef struct { |
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54 | link_t link; |
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762 | palkovsky | 55 | count_t busy; /**< Count of full slots in magazine */ |
56 | count_t size; /**< Number of slots in magazine */ |
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57 | void *objs[0]; /**< Slots in magazine */ |
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759 | palkovsky | 58 | }slab_magazine_t; |
59 | |||
60 | typedef struct { |
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61 | char *name; |
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62 | |||
63 | SPINLOCK_DECLARE(lock); |
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64 | link_t link; |
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65 | /* Configuration */ |
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762 | palkovsky | 66 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */ |
759 | palkovsky | 67 | int (*constructor)(void *obj, int kmflag); |
68 | void (*destructor)(void *obj); |
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762 | palkovsky | 69 | int flags; /**< Flags changing behaviour of cache */ |
759 | palkovsky | 70 | |
71 | /* Computed values */ |
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762 | palkovsky | 72 | __u8 order; /**< Order of frames to be allocated */ |
73 | int objects; /**< Number of objects that fit in */ |
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759 | palkovsky | 74 | |
75 | /* Statistics */ |
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764 | palkovsky | 76 | atomic_t allocated_slabs; |
77 | atomic_t allocated_objs; |
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759 | palkovsky | 78 | |
79 | /* Slabs */ |
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762 | palkovsky | 80 | link_t full_slabs; /**< List of full slabs */ |
81 | link_t partial_slabs; /**< List of partial slabs */ |
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759 | palkovsky | 82 | /* Magazines */ |
762 | palkovsky | 83 | link_t magazines; /**< List o full magazines */ |
84 | |||
85 | /** CPU cache */ |
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759 | palkovsky | 86 | struct { |
87 | slab_magazine_t *current; |
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88 | slab_magazine_t *last; |
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89 | SPINLOCK_DECLARE(lock); |
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90 | }mag_cache[0]; |
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91 | }slab_cache_t; |
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92 | |||
762 | palkovsky | 93 | extern slab_cache_t * slab_cache_create(char *name, |
94 | size_t size, |
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95 | size_t align, |
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96 | int (*constructor)(void *obj, int kmflag), |
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97 | void (*destructor)(void *obj), |
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98 | int flags); |
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99 | extern void slab_cache_destroy(slab_cache_t *cache); |
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759 | palkovsky | 100 | |
762 | palkovsky | 101 | extern void * slab_alloc(slab_cache_t *cache, int flags); |
102 | extern void slab_free(slab_cache_t *cache, void *obj); |
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103 | extern count_t slab_reclaim(int flags); |
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759 | palkovsky | 104 | |
105 | /** Initialize SLAB subsytem */ |
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762 | palkovsky | 106 | extern void slab_cache_init(void); |
759 | palkovsky | 107 | |
108 | /* KConsole debug */ |
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762 | palkovsky | 109 | extern void slab_print_list(void); |
759 | palkovsky | 110 | |
111 | #endif |