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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. /** @addtogroup genericmm
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. #ifndef KERN_SLAB_H_
  36. #define KERN_SLAB_H_
  37.  
  38. #include <adt/list.h>
  39. #include <synch/spinlock.h>
  40. #include <atomic.h>
  41. #include <mm/frame.h>
  42.  
  43. /** Minimum size to be allocated by malloc */
  44. #define SLAB_MIN_MALLOC_W 4
  45.  
  46. /** Maximum size to be allocated by malloc */
  47. #define SLAB_MAX_MALLOC_W 18
  48.  
  49. /** Initial Magazine size (TODO: dynamically growing magazines) */
  50. #define SLAB_MAG_SIZE  4
  51.  
  52. /** If object size is less, store control structure inside SLAB */
  53. #define SLAB_INSIDE_SIZE   (PAGE_SIZE >> 3)
  54.  
  55. /** Maximum wasted space we allow for cache */
  56. #define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) >> 2)
  57.  
  58. /* slab_reclaim constants */
  59.  
  60. /** Reclaim all possible memory, because we are in memory stress */
  61. #define SLAB_RECLAIM_ALL  0x1
  62.  
  63. /* cache_create flags */
  64.  
  65. /** Do not use per-cpu cache */
  66. #define SLAB_CACHE_NOMAGAZINE 0x1
  67. /** Have control structure inside SLAB */
  68. #define SLAB_CACHE_SLINSIDE   0x2
  69. /** We add magazine cache later, if we have this flag */
  70. #define SLAB_CACHE_MAGDEFERRED (0x4 | SLAB_CACHE_NOMAGAZINE)
  71.  
  72. typedef struct {
  73.     link_t link;
  74.     count_t busy;  /**< Count of full slots in magazine */
  75.     count_t size;  /**< Number of slots in magazine */
  76.     void *objs[0]; /**< Slots in magazine */
  77. } slab_magazine_t;
  78.  
  79. typedef struct {
  80.     slab_magazine_t *current;
  81.     slab_magazine_t *last;
  82.     SPINLOCK_DECLARE(lock);
  83. } slab_mag_cache_t;
  84.  
  85.  
  86. typedef struct {
  87.     char *name;
  88.  
  89.     link_t link;
  90.  
  91.     /* Configuration */
  92.     /** Size of slab position - align_up(sizeof(obj)) */
  93.     size_t size;
  94.  
  95.     int (*constructor)(void *obj, int kmflag);
  96.     int (*destructor)(void *obj);
  97.  
  98.     /** Flags changing behaviour of cache */
  99.     int flags;
  100.  
  101.     /* Computed values */
  102.     uint8_t order;      /**< Order of frames to be allocated */
  103.     int objects;        /**< Number of objects that fit in */
  104.  
  105.     /* Statistics */
  106.     atomic_t allocated_slabs;
  107.     atomic_t allocated_objs;
  108.     atomic_t cached_objs;
  109.     /** How many magazines in magazines list */
  110.     atomic_t magazine_counter;
  111.  
  112.     /* Slabs */
  113.     link_t full_slabs;  /**< List of full slabs */
  114.     link_t partial_slabs;   /**< List of partial slabs */
  115.     SPINLOCK_DECLARE(slablock);
  116.     /* Magazines  */
  117.     link_t magazines;   /**< List o full magazines */
  118.     SPINLOCK_DECLARE(maglock);
  119.  
  120.     /** CPU cache */
  121.     slab_mag_cache_t *mag_cache;
  122. } slab_cache_t;
  123.  
  124. extern slab_cache_t * slab_cache_create(char *name, size_t size, size_t align,
  125.     int (*constructor)(void *obj, int kmflag), int (*destructor)(void *obj),
  126.     int flags);
  127. extern void slab_cache_destroy(slab_cache_t *cache);
  128.  
  129. extern void * slab_alloc(slab_cache_t *cache, int flags);
  130. extern void slab_free(slab_cache_t *cache, void *obj);
  131. extern count_t slab_reclaim(int flags);
  132.  
  133. /* slab subsytem initialization */
  134. extern void slab_cache_init(void);
  135. extern void slab_enable_cpucache(void);
  136.  
  137. /* kconsole debug */
  138. extern void slab_print_list(void);
  139.  
  140. /* malloc support */
  141. extern void * malloc(unsigned int size, int flags);
  142. extern void * realloc(void *ptr, unsigned int size, int flags);
  143. extern void free(void *ptr);
  144. #endif
  145.  
  146. /** @}
  147.  */
  148.