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  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 <atomic.h>
  35. #include <mm/frame.h>
  36.  
  37. /** Minimum size to be allocated by malloc */
  38. #define SLAB_MIN_MALLOC_W 4
  39.  
  40. /** Maximum size to be allocated by malloc */
  41. #define SLAB_MAX_MALLOC_W 18
  42.  
  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 */
  47. #define SLAB_INSIDE_SIZE   (PAGE_SIZE >> 3)
  48.  
  49. /** Maximum wasted space we allow for cache */
  50. #define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) >> 2)
  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 */
  59. /** We add magazine cache later, if we have this flag */
  60. #define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE)
  61.  
  62. typedef struct {
  63.     link_t link;
  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 */
  67. }slab_magazine_t;
  68.  
  69. typedef struct {
  70.     slab_magazine_t *current;
  71.     slab_magazine_t *last;
  72.     SPINLOCK_DECLARE(lock);
  73. }slab_mag_cache_t;
  74.  
  75.  
  76. typedef struct {
  77.     char *name;
  78.  
  79.     link_t link;
  80.     /* Configuration */
  81.     size_t size;      /**< Size of SLAB position - align_up(sizeof(obj)) */
  82.     int (*constructor)(void *obj, int kmflag);
  83.     int (*destructor)(void *obj);
  84.     int flags;        /**< Flags changing behaviour of cache */
  85.  
  86.     /* Computed values */
  87.     __u8 order;        /**< Order of frames to be allocated */
  88.     int objects;      /**< Number of objects that fit in */
  89.  
  90.     /* Statistics */
  91.     atomic_t allocated_slabs;
  92.     atomic_t allocated_objs;
  93.     atomic_t cached_objs;
  94.     atomic_t magazine_counter; /*<< How many magazines in magazines list */
  95.  
  96.     /* Slabs */
  97.     link_t full_slabs;     /**< List of full slabs */
  98.     link_t partial_slabs;  /**< List of partial slabs */
  99.     SPINLOCK_DECLARE(slablock);
  100.     /* Magazines  */
  101.     link_t magazines;      /**< List o full magazines */
  102.     SPINLOCK_DECLARE(maglock);
  103.  
  104.     /** CPU cache */
  105.     slab_mag_cache_t *mag_cache;
  106. }slab_cache_t;
  107.  
  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),
  112.                     int (*destructor)(void *obj),
  113.                     int flags);
  114. extern void slab_cache_destroy(slab_cache_t *cache);
  115.  
  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);
  119.  
  120. /** Initialize SLAB subsytem */
  121. extern void slab_cache_init(void);
  122. extern void slab_enable_cpucache(void);
  123.  
  124. /* KConsole debug */
  125. extern void slab_print_list(void);
  126.  
  127. /* Malloc support */
  128. extern void * malloc(unsigned int size, int flags);
  129. extern void free(void *obj);
  130. #endif
  131.