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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 <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. /** Maximum wasted space we allow for cache */
  42. #define SLAB_MAX_BADNESS(cache)   ((PAGE_SIZE << (cache)->order) / 4)
  43.  
  44. /* slab_reclaim constants */
  45. #define SLAB_RECLAIM_ALL  0x1 /**< Reclaim all possible memory, because
  46.                    *   we are in memory stress */
  47.  
  48. /* cache_create flags */
  49. #define SLAB_CACHE_NOMAGAZINE 0x1 /**< Do not use per-cpu cache */
  50. #define SLAB_CACHE_SLINSIDE   0x2 /**< Have control structure inside SLAB */
  51.  
  52. typedef struct {
  53.     link_t link;
  54.     count_t busy;  /**< Count of full slots in magazine */
  55.     count_t size;  /**< Number of slots in magazine */
  56.     void *objs[0]; /**< Slots in magazine */
  57. }slab_magazine_t;
  58.  
  59. typedef struct {
  60.     char *name;
  61.  
  62.     SPINLOCK_DECLARE(lock);
  63.     link_t link;
  64.     /* Configuration */
  65.     size_t size;      /**< Size of SLAB position - align_up(sizeof(obj)) */
  66.     int (*constructor)(void *obj, int kmflag);
  67.     void (*destructor)(void *obj);
  68.     int flags;        /**< Flags changing behaviour of cache */
  69.  
  70.     /* Computed values */
  71.     __u8 order;        /**< Order of frames to be allocated */
  72.     int objects;      /**< Number of objects that fit in */
  73.  
  74.     /* Statistics */
  75.  
  76.     /* Slabs */
  77.     link_t full_slabs;     /**< List of full slabs */
  78.     link_t partial_slabs;  /**< List of partial slabs */
  79.     /* Magazines  */
  80.     link_t magazines;      /**< List o full magazines */
  81.  
  82.     /** CPU cache */
  83.     struct {
  84.         slab_magazine_t *current;
  85.         slab_magazine_t *last;
  86.         SPINLOCK_DECLARE(lock);
  87.     }mag_cache[0];
  88. }slab_cache_t;
  89.  
  90. extern slab_cache_t * slab_cache_create(char *name,
  91.                     size_t size,
  92.                     size_t align,
  93.                     int (*constructor)(void *obj, int kmflag),
  94.                     void (*destructor)(void *obj),
  95.                     int flags);
  96. extern void slab_cache_destroy(slab_cache_t *cache);
  97.  
  98. extern void * slab_alloc(slab_cache_t *cache, int flags);
  99. extern void slab_free(slab_cache_t *cache, void *obj);
  100. extern count_t slab_reclaim(int flags);
  101.  
  102. /** Initialize SLAB subsytem */
  103. extern void slab_cache_init(void);
  104.  
  105. /* KConsole debug */
  106. extern void slab_print_list(void);
  107.  
  108. #endif
  109.