| 1 | /*
|
|---|
| 2 | * Copyright (C) 2006 Ondrej Palkovsky
|
|---|
| 3 | * All rights reserved.
|
|---|
| 4 | *
|
|---|
| 5 | * Redistribution and use in source and binary forms, with or without
|
|---|
| 6 | * modification, are permitted provided that the following conditions
|
|---|
| 7 | * are met:
|
|---|
| 8 | *
|
|---|
| 9 | * - Redistributions of source code must retain the above copyright
|
|---|
| 10 | * notice, this list of conditions and the following disclaimer.
|
|---|
| 11 | * - Redistributions in binary form must reproduce the above copyright
|
|---|
| 12 | * notice, this list of conditions and the following disclaimer in the
|
|---|
| 13 | * documentation and/or other materials provided with the distribution.
|
|---|
| 14 | * - The name of the author may not be used to endorse or promote products
|
|---|
| 15 | * derived from this software without specific prior written permission.
|
|---|
| 16 | *
|
|---|
| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|---|
| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|---|
| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|---|
| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|---|
| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|---|
| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|---|
| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|---|
| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|---|
| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|---|
| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|---|
| 27 | */
|
|---|
| 28 |
|
|---|
| 29 | #ifndef __SLAB_H__
|
|---|
| 30 | #define __SLAB_H__
|
|---|
| 31 |
|
|---|
| 32 | #include <adt/list.h>
|
|---|
| 33 | #include <synch/spinlock.h>
|
|---|
| 34 | #include <arch/atomic.h>
|
|---|
| 35 |
|
|---|
| 36 | /** Minimum size to be allocated by malloc */
|
|---|
| 37 | #define SLAB_MIN_MALLOC_W 3
|
|---|
| 38 |
|
|---|
| 39 | /** Maximum size to be allocated by malloc */
|
|---|
| 40 | #define SLAB_MAX_MALLOC_W 17
|
|---|
| 41 |
|
|---|
| 42 | /** Initial Magazine size (TODO: dynamically growing magazines) */
|
|---|
| 43 | #define SLAB_MAG_SIZE 4
|
|---|
| 44 |
|
|---|
| 45 | /** If object size is less, store control structure inside SLAB */
|
|---|
| 46 | #define SLAB_INSIDE_SIZE (PAGE_SIZE >> 3)
|
|---|
| 47 |
|
|---|
| 48 | /** Maximum wasted space we allow for cache */
|
|---|
| 49 | #define SLAB_MAX_BADNESS(cache) ((PAGE_SIZE << (cache)->order) >> 2)
|
|---|
| 50 |
|
|---|
| 51 | /* slab_reclaim constants */
|
|---|
| 52 | #define SLAB_RECLAIM_ALL 0x1 /**< Reclaim all possible memory, because
|
|---|
| 53 | * we are in memory stress */
|
|---|
| 54 |
|
|---|
| 55 | /* cache_create flags */
|
|---|
| 56 | #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
|
|---|
| 57 | #define SLAB_CACHE_SLINSIDE 0x2 /**< Have control structure inside SLAB */
|
|---|
| 58 |
|
|---|
| 59 | typedef struct {
|
|---|
| 60 | link_t link;
|
|---|
| 61 | count_t busy; /**< Count of full slots in magazine */
|
|---|
| 62 | count_t size; /**< Number of slots in magazine */
|
|---|
| 63 | void *objs[0]; /**< Slots in magazine */
|
|---|
| 64 | }slab_magazine_t;
|
|---|
| 65 |
|
|---|
| 66 | typedef struct {
|
|---|
| 67 | char *name;
|
|---|
| 68 |
|
|---|
| 69 | link_t link;
|
|---|
| 70 | /* Configuration */
|
|---|
| 71 | size_t size; /**< Size of SLAB position - align_up(sizeof(obj)) */
|
|---|
| 72 | int (*constructor)(void *obj, int kmflag);
|
|---|
| 73 | int (*destructor)(void *obj);
|
|---|
| 74 | int flags; /**< Flags changing behaviour of cache */
|
|---|
| 75 |
|
|---|
| 76 | /* Computed values */
|
|---|
| 77 | __u8 order; /**< Order of frames to be allocated */
|
|---|
| 78 | int objects; /**< Number of objects that fit in */
|
|---|
| 79 |
|
|---|
| 80 | /* Statistics */
|
|---|
| 81 | atomic_t allocated_slabs;
|
|---|
| 82 | atomic_t allocated_objs;
|
|---|
| 83 | atomic_t cached_objs;
|
|---|
| 84 | atomic_t magazine_counter; /*<< How many magazines in magazines list */
|
|---|
| 85 |
|
|---|
| 86 | /* Slabs */
|
|---|
| 87 | link_t full_slabs; /**< List of full slabs */
|
|---|
| 88 | link_t partial_slabs; /**< List of partial slabs */
|
|---|
| 89 | SPINLOCK_DECLARE(slablock);
|
|---|
| 90 | /* Magazines */
|
|---|
| 91 | link_t magazines; /**< List o full magazines */
|
|---|
| 92 | SPINLOCK_DECLARE(maglock);
|
|---|
| 93 |
|
|---|
| 94 | /** CPU cache */
|
|---|
| 95 | struct {
|
|---|
| 96 | slab_magazine_t *current;
|
|---|
| 97 | slab_magazine_t *last;
|
|---|
| 98 | SPINLOCK_DECLARE(lock);
|
|---|
| 99 | }mag_cache[0];
|
|---|
| 100 | }slab_cache_t;
|
|---|
| 101 |
|
|---|
| 102 | extern slab_cache_t * slab_cache_create(char *name,
|
|---|
| 103 | size_t size,
|
|---|
| 104 | size_t align,
|
|---|
| 105 | int (*constructor)(void *obj, int kmflag),
|
|---|
| 106 | int (*destructor)(void *obj),
|
|---|
| 107 | int flags);
|
|---|
| 108 | extern void slab_cache_destroy(slab_cache_t *cache);
|
|---|
| 109 |
|
|---|
| 110 | extern void * slab_alloc(slab_cache_t *cache, int flags);
|
|---|
| 111 | extern void slab_free(slab_cache_t *cache, void *obj);
|
|---|
| 112 | extern count_t slab_reclaim(int flags);
|
|---|
| 113 |
|
|---|
| 114 | /** Initialize SLAB subsytem */
|
|---|
| 115 | extern void slab_cache_init(void);
|
|---|
| 116 |
|
|---|
| 117 | /* KConsole debug */
|
|---|
| 118 | extern void slab_print_list(void);
|
|---|
| 119 |
|
|---|
| 120 | /* Malloc support */
|
|---|
| 121 | extern void * kalloc(unsigned int size, int flags);
|
|---|
| 122 | extern void kfree(void *obj);
|
|---|
| 123 |
|
|---|
| 124 | #endif
|
|---|
