Subversion Repositories HelenOS

Rev

Rev 762 | Go to most recent revision | Details | Last modification | View Log | RSS feed

Rev Author Line No. Line
759 palkovsky 1
/*
2
 * Copyright (C) 2005 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 <list.h>
33
#include <synch/spinlock.h>
34
 
35
/** Initial Magazine size (TODO: dynamically growing magazines) */
36
#define SLAB_MAG_SIZE  4
37
 
38
/** If object size is less, store control structure inside SLAB */
39
#define SLAB_INSIDE_SIZE   (PAGE_SIZE / 6)
40
 
41
/* slab_alloc constants */
42
#define SLAB_ATOMIC       0x1 /**< Do not sleep when no free memory, 
43
                   may return NULL */
44
#define SLAB_NO_RECLAIM   0x2 /**< Do not try to call slab_reclaim, if no
45
                 free memory is found - avoid deadlock */
46
 
47
/* slab_reclaim constants */
48
#define SLAB_RECLAIM_ALL  0x1 /**< Reclaim all possible memory, because
49
                   *   we are in memory stress */
50
 
51
/* cache_create flags */
52
#define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
53
#define SLAB_CACHE_SLINSIDE   0x2 /**< Have control structure inside SLAB */
54
 
55
typedef struct {
56
    link_t link;
57
    count_t busy;
58
    count_t size;
59
    void *objs[0];
60
}slab_magazine_t;
61
 
62
typedef struct {
63
    char *name;
64
 
65
    SPINLOCK_DECLARE(lock);
66
    link_t link;
67
    /* Configuration */
68
    size_t size;
69
    size_t align;
70
    int (*constructor)(void *obj, int kmflag);
71
    void (*destructor)(void *obj);
72
    int flags;
73
 
74
    /* Computed values */
75
    int pages;
76
    int objects;
77
 
78
    /* Statistics */
79
 
80
    /* Slabs */
81
    link_t full_slabs;
82
    link_t partial_slabs;
83
    /* Magazines  */
84
    link_t magazines;
85
    /* CPU cache */
86
    struct {
87
        slab_magazine_t *current;
88
        slab_magazine_t *last;
89
        SPINLOCK_DECLARE(lock);
90
    }mag_cache[0];
91
}slab_cache_t;
92
 
93
typedef struct {
94
    slab_cache_t *cache; /**< Pointer to parent cache */
95
    void *start;       /**< Start address of first available item */
96
    count_t available; /**< Count of available items in this slab */
97
    index_t nextavail; /**< The index of next available item */
98
}slab_slab_t;
99
 
100
 
101
slab_cache_t * slab_cache_create(char *name,
102
                 size_t size,
103
                 size_t align,
104
                 int (*constructor)(void *obj, int kmflag),
105
                 void (*destructor)(void *obj),
106
                 int flags);
107
void slab_cache_destroy(slab_cache_t *cache);
108
 
109
void * slab_alloc(slab_cache_t *cache, int flags);
110
void slab_free(slab_cache_t *cache, void *obj);
111
count_t slab_reclaim(int flags);
112
 
113
/** Initialize SLAB subsytem */
114
void slab_cache_init(void);
115
 
116
/* KConsole debug */
117
void slab_print_list(void);
118
 
119
#endif