| 1 | /*
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| 2 | * Copyright (C) 2006 Ondrej Palkovsky
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| 3 | * All rights reserved.
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| 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 |
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| 29 | #ifndef __SLAB_H__
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| 30 | #define __SLAB_H__
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| 31 |
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| 32 | #include <list.h>
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| 33 | #include <synch/spinlock.h>
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| 34 | #include <arch/atomic.h>
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| 35 |
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| 36 | /** Minimum size to be allocated by malloc */
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| 37 | #define SLAB_MIN_MALLOC_W 3
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| 38 |
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| 39 | /** Maximum size to be allocated by malloc */
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| 40 | #define SLAB_MAX_MALLOC_W 17
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| 41 |
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| 42 | /** Initial Magazine size (TODO: dynamically growing magazines) */
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| 43 | #define SLAB_MAG_SIZE 4
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| 44 |
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| 45 | /** If object size is less, store control structure inside SLAB */
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| 46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3)
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| 47 |
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| 48 | /** Maximum wasted space we allow for cache */
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| 49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2)
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| 50 |
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| 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 |
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| 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 |
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| 59 | typedef struct {
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| 60 | link_t link;
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| 61 | count_t busy; /**< Count of full slots in magazine */
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| 62 | count_t size; /**< Number of slots in magazine */
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| 63 | void *objs[0]; /**< Slots in magazine */
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| 64 | }slab_magazine_t;
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| 65 |
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| 66 | typedef struct {
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| 67 | char *name;
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| 68 |
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| 69 | link_t link;
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| 70 | /* Configuration */
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| 71 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */
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| 72 | int (*constructor)(void *obj, int kmflag);
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| 73 | void (*destructor)(void *obj);
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| 74 | int flags; /**< Flags changing behaviour of cache */
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| 75 |
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| 76 | /* Computed values */
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| 77 | __u8 order; /**< Order of frames to be allocated */
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| 78 | int objects; /**< Number of objects that fit in */
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| 79 |
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| 80 | /* Statistics */
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| 81 | atomic_t allocated_slabs;
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| 82 | atomic_t allocated_objs;
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| 83 | atomic_t cached_objs;
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| 84 |
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| 85 | /* Slabs */
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| 86 | link_t full_slabs; /**< List of full slabs */
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| 87 | link_t partial_slabs; /**< List of partial slabs */
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| 88 | SPINLOCK_DECLARE(slablock);
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| 89 | /* Magazines */
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| 90 | link_t magazines; /**< List o full magazines */
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| 91 | SPINLOCK_DECLARE(maglock);
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| 92 |
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| 93 | /** CPU cache */
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| 94 | struct {
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| 95 | slab_magazine_t *current;
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| 96 | slab_magazine_t *last;
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| 97 | SPINLOCK_DECLARE(lock);
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| 98 | }mag_cache[0];
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| 99 | }slab_cache_t;
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| 100 |
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| 101 | extern slab_cache_t * slab_cache_create(char *name,
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| 102 | size_t size,
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| 103 | size_t align,
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| 104 | int (*constructor)(void *obj, int kmflag),
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| 105 | void (*destructor)(void *obj),
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| 106 | int flags);
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| 107 | extern void slab_cache_destroy(slab_cache_t *cache);
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| 108 |
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| 109 | extern void * slab_alloc(slab_cache_t *cache, int flags);
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| 110 | extern void slab_free(slab_cache_t *cache, void *obj);
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| 111 | extern count_t slab_reclaim(int flags);
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| 112 |
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| 113 | /** Initialize SLAB subsytem */
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| 114 | extern void slab_cache_init(void);
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| 115 |
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| 116 | /* KConsole debug */
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| 117 | extern void slab_print_list(void);
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| 118 |
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| 119 | /* Malloc support */
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| 120 | extern void * kalloc(unsigned int size, int flags);
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| 121 | extern void kfree(void *obj);
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| 122 |
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| 123 | #endif
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