Subversion Repositories HelenOS

Rev

Rev 1428 | Rev 1702 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
759 palkovsky 1 
/*
762 palkovsky 2 
 * Copyright (C) 2006 Ondrej Palkovsky
759 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 
 
788 jermar 32 
#include <adt/list.h>
759 palkovsky 33 
#include <synch/spinlock.h>
1104 jermar 34 
#include <atomic.h>
814 palkovsky 35 
#include <mm/frame.h>
759 palkovsky 36 
 
771 palkovsky 37 
/** Minimum size to be allocated by malloc */
791 palkovsky 38 
#define SLAB_MIN_MALLOC_W 4
771 palkovsky 39 
 
40 
/** Maximum size to be allocated by malloc */
1428 palkovsky 41 
#define SLAB_MAX_MALLOC_W 18
771 palkovsky 42 
 
759 palkovsky 43 
/** Initial Magazine size (TODO: dynamically growing magazines) */
44 
#define SLAB_MAG_SIZE  4
45 
 
46 
/** If object size is less, store control structure inside SLAB */
766 palkovsky 47 
#define SLAB_INSIDE_SIZE   (PAGE_SIZE >> 3)
759 palkovsky 48 
 
762 palkovsky 49 
/** Maximum wasted space we allow for cache */
771 palkovsky 50 
#define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) >> 2)
759 palkovsky 51 
 
52 
/* slab_reclaim constants */
53 
#define SLAB_RECLAIM_ALL  0x1 /**< Reclaim all possible memory, because
54 
                   *   we are in memory stress */
55 
 
56 
/* cache_create flags */
57 
#define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
58 
#define SLAB_CACHE_SLINSIDE   0x2 /**< Have control structure inside SLAB */
789 palkovsky 59 
/** We add magazine cache later, if we have this flag */
60 
#define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE)
759 palkovsky 61 
 
62 
typedef struct {
63 
    link_t link;
762 palkovsky 64 
    count_t busy;  /**< Count of full slots in magazine */
65 
    count_t size;  /**< Number of slots in magazine */
66 
    void *objs[0]; /**< Slots in magazine */
759 palkovsky 67 
}slab_magazine_t;
68 
 
69 
typedef struct {
789 palkovsky 70 
    slab_magazine_t *current;
71 
    slab_magazine_t *last;
72 
    SPINLOCK_DECLARE(lock);
73 
}slab_mag_cache_t;
74 
 
75 
 
76 
typedef struct {
759 palkovsky 77 
    char *name;
78 
 
79 
    link_t link;
80 
    /* Configuration */
1576 jermar 81 
    size_t size;      /**< Size of slab position - align_up(sizeof(obj)) */
759 palkovsky 82 
    int (*constructor)(void *obj, int kmflag);
787 palkovsky 83 
    int (*destructor)(void *obj);
762 palkovsky 84 
    int flags;        /**< Flags changing behaviour of cache */
759 palkovsky 85 
 
86 
    /* Computed values */
762 palkovsky 87 
    __u8 order;        /**< Order of frames to be allocated */
88 
    int objects;      /**< Number of objects that fit in */
759 palkovsky 89 
 
90 
    /* Statistics */
764 palkovsky 91 
    atomic_t allocated_slabs;
92 
    atomic_t allocated_objs;
767 palkovsky 93 
    atomic_t cached_objs;
1576 jermar 94 
    atomic_t magazine_counter; /**< How many magazines in magazines list */
759 palkovsky 95 
 
96 
    /* Slabs */
762 palkovsky 97 
    link_t full_slabs;     /**< List of full slabs */
98 
    link_t partial_slabs;  /**< List of partial slabs */
776 palkovsky 99 
    SPINLOCK_DECLARE(slablock);
759 palkovsky 100 
    /* Magazines  */
762 palkovsky 101 
    link_t magazines;      /**< List o full magazines */
776 palkovsky 102 
    SPINLOCK_DECLARE(maglock);
762 palkovsky 103 
 
104 
    /** CPU cache */
789 palkovsky 105 
    slab_mag_cache_t *mag_cache;
759 palkovsky 106 
}slab_cache_t;
107 
 
762 palkovsky 108 
extern slab_cache_t * slab_cache_create(char *name,
109 
                    size_t size,
110 
                    size_t align,
111 
                    int (*constructor)(void *obj, int kmflag),
787 palkovsky 112 
                    int (*destructor)(void *obj),
762 palkovsky 113 
                    int flags);
114 
extern void slab_cache_destroy(slab_cache_t *cache);
759 palkovsky 115 
 
762 palkovsky 116 
extern void * slab_alloc(slab_cache_t *cache, int flags);
117 
extern void slab_free(slab_cache_t *cache, void *obj);
118 
extern count_t slab_reclaim(int flags);
759 palkovsky 119 
 
1576 jermar 120 
/** Initialize slab subsytem */
762 palkovsky 121 
extern void slab_cache_init(void);
789 palkovsky 122 
extern void slab_enable_cpucache(void);
759 palkovsky 123 
 
1576 jermar 124 
/* kconsole debug */
762 palkovsky 125 
extern void slab_print_list(void);
759 palkovsky 126 
 
1576 jermar 127 
/* malloc support */
822 palkovsky 128 
extern void * malloc(unsigned int size, int flags);
129 
extern void free(void *obj);
759 palkovsky 130 
#endif