usr/src/lib/libmtmalloc/common/mtmalloc_impl.h

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1998-2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _MTMALLOC_IMPL_H
  28 #define _MTMALLOC_IMPL_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 /*
  33  * Various data structures that define the guts of the mt malloc
  34  * library.
  35  */
  36
  37 #include <sys/types.h>
  38 #include <synch.h>
  39
  40 #ifdef __cplusplus
  41 extern "C" {
  42 #endif
  43
  44 typedef struct cache {
  45         mutex_t mt_cache_lock;  /* lock for this data structure */
  46         caddr_t mt_freelist;    /* free block bit mask */
  47         caddr_t mt_arena;       /* addr of arena for actual dblks */
  48         size_t  mt_nfree;       /* how many freeblocks do we have */
  49         size_t mt_size;         /* size of this cache */
  50         size_t mt_span;         /* how long is this cache */
  51         struct cache *mt_next;  /* next cache in list */
  52         int mt_hunks;           /* at creation time what chunk size */
  53 } cache_t;
  54
  55 typedef struct oversize {
  56         struct oversize *next_bysize;
  57         struct oversize *prev_bysize;
  58         struct oversize *next_byaddr;
  59         struct oversize *prev_byaddr;
  60         struct oversize *hash_next;
  61         caddr_t addr;
  62         size_t  size;
  63 } oversize_t;
  64
  65 typedef struct cache_head {
  66         cache_t *mt_cache;
  67         cache_t *mt_hint;
  68 } cache_head_t;
  69
  70 /* used to avoid false sharing, should be power-of-2 >= cache coherency size */
  71 #define CACHE_COHERENCY_UNIT    64
  72
  73 #define PERCPU_SIZE     CACHE_COHERENCY_UNIT
  74 #define PERCPU_PAD      (PERCPU_SIZE - sizeof (mutex_t) - \
  75                         sizeof (cache_head_t *))
  76
  77 typedef struct percpu {
  78         mutex_t mt_parent_lock; /* used for hooking in new caches */
  79         cache_head_t *mt_caches;
  80         char mt_pad[PERCPU_PAD];
  81 } percpu_t;
  82
  83 typedef uint_t (*curcpu_func)(void);
  84
  85 #define DATA_SHIFT      1
  86 #define TAIL_SHIFT      2
  87
  88 /*
  89  * Oversize bit definitions: 3 bits to represent the oversize for
  90  * head fragment, data itself, and tail fragment.
  91  * If the head fragment is oversize, the first bit is on.
  92  * If the data itself is oversize, the second bit is on.
  93  * If the tail fragment is oversize, then the third bit is on.
  94  */
  95 #define NONE_OVERSIZE           0x0
  96 #define HEAD_OVERSIZE           0x1
  97 #define DATA_OVERSIZE           0x2
  98 #define HEAD_AND_DATA_OVERSIZE  0x3
  99 #define TAIL_OVERSIZE           0x4
 100 #define HEAD_AND_TAIL_OVERSIZE  0x5
 101 #define DATA_AND_TAIL_OVERSIZE  0x6
 102 #define ALL_OVERSIZE            0x7
 103
 104 #ifdef __cplusplus
 105 }
 106 #endif
 107
 108 #endif /* _MTMALLOC_IMPL_H */