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annotate src/core/ngx_slab.c @ 6828:99770a5ea14f

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Slab: slots statistics. For each slot, the number of total and used entries, as well as the number of allocation requests and failures, are tracked.
author Ruslan Ermilov <ru@nginx.com>
date Wed, 07 Dec 2016 22:25:37 +0300
parents 0e61510c56c4
children 6e757036e588
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441
da8c5707af39 nginx-0.1.0-2004-09-28-12:34:51 import; set copyright and remove unused files
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2 /*
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3 * Copyright (C) Igor Sysoev
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d620f497c50f Copyright updated.
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4 * Copyright (C) Nginx, Inc.
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5 */
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6
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7 #include <ngx_config.h>
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8 #include <ngx_core.h>
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9
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10
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11 #define NGX_SLAB_PAGE_MASK 3
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12 #define NGX_SLAB_PAGE 0
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13 #define NGX_SLAB_BIG 1
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14 #define NGX_SLAB_EXACT 2
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15 #define NGX_SLAB_SMALL 3
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16
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17 #if (NGX_PTR_SIZE == 4)
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18
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19 #define NGX_SLAB_PAGE_FREE 0
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20 #define NGX_SLAB_PAGE_BUSY 0xffffffff
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21 #define NGX_SLAB_PAGE_START 0x80000000
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22
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23 #define NGX_SLAB_SHIFT_MASK 0x0000000f
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24 #define NGX_SLAB_MAP_MASK 0xffff0000
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25 #define NGX_SLAB_MAP_SHIFT 16
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26
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27 #define NGX_SLAB_BUSY 0xffffffff
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28
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29 #else /* (NGX_PTR_SIZE == 8) */
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30
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31 #define NGX_SLAB_PAGE_FREE 0
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32 #define NGX_SLAB_PAGE_BUSY 0xffffffffffffffff
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33 #define NGX_SLAB_PAGE_START 0x8000000000000000
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34
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35 #define NGX_SLAB_SHIFT_MASK 0x000000000000000f
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36 #define NGX_SLAB_MAP_MASK 0xffffffff00000000
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37 #define NGX_SLAB_MAP_SHIFT 32
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38
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39 #define NGX_SLAB_BUSY 0xffffffffffffffff
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40
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41 #endif
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42
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43
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44 #define ngx_slab_slots(pool) \
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45 (ngx_slab_page_t *) ((u_char *) (pool) + sizeof(ngx_slab_pool_t))
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46
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47 #define ngx_slab_page_type(page) ((page)->prev & NGX_SLAB_PAGE_MASK)
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48
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49 #define ngx_slab_page_prev(page) \
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50 (ngx_slab_page_t *) ((page)->prev & ~NGX_SLAB_PAGE_MASK)
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51
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52 #define ngx_slab_page_addr(pool, page) \
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53 ((((page) - (pool)->pages) << ngx_pagesize_shift) \
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54 + (uintptr_t) (pool)->start)
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55
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56
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57 #if (NGX_DEBUG_MALLOC)
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58
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59 #define ngx_slab_junk(p, size) ngx_memset(p, 0xA5, size)
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60
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61 #elif (NGX_HAVE_DEBUG_MALLOC)
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62
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63 #define ngx_slab_junk(p, size) \
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64 if (ngx_debug_malloc) ngx_memset(p, 0xA5, size)
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65
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66 #else
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67
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68 #define ngx_slab_junk(p, size)
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69
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70 #endif
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71
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72 static ngx_slab_page_t *ngx_slab_alloc_pages(ngx_slab_pool_t *pool,
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73 ngx_uint_t pages);
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74 static void ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page,
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75 ngx_uint_t pages);
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76 static void ngx_slab_error(ngx_slab_pool_t *pool, ngx_uint_t level,
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77 char *text);
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78
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79
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80 static ngx_uint_t ngx_slab_max_size;
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81 static ngx_uint_t ngx_slab_exact_size;
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82 static ngx_uint_t ngx_slab_exact_shift;
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83
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84
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85 void
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86 ngx_slab_init(ngx_slab_pool_t *pool)
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87 {
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88 u_char *p;
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89 size_t size;
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90 ngx_int_t m;
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91 ngx_uint_t i, n, pages;
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92 ngx_slab_page_t *slots, *page;
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93
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94 /* STUB */
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95 if (ngx_slab_max_size == 0) {
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96 ngx_slab_max_size = ngx_pagesize / 2;
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97 ngx_slab_exact_size = ngx_pagesize / (8 * sizeof(uintptr_t));
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98 for (n = ngx_slab_exact_size; n >>= 1; ngx_slab_exact_shift++) {
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99 /* void */
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100 }
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101 }
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102 /**/
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103
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104 pool->min_size = 1 << pool->min_shift;
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105
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106 slots = ngx_slab_slots(pool);
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107
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108 p = (u_char *) slots;
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109 size = pool->end - p;
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110
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111 ngx_slab_junk(p, size);
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112
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113 n = ngx_pagesize_shift - pool->min_shift;
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114
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115 for (i = 0; i < n; i++) {
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116 /* only "next" is used in list head */
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117 slots[i].slab = 0;
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118 slots[i].next = &slots[i];
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119 slots[i].prev = 0;
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120 }
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121
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122 p += n * sizeof(ngx_slab_page_t);
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123
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124 pool->stats = (ngx_slab_stat_t *) p;
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125 ngx_memzero(pool->stats, n * sizeof(ngx_slab_stat_t));
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126
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127 p += n * sizeof(ngx_slab_stat_t);
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128
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129 size -= n * (sizeof(ngx_slab_page_t) + sizeof(ngx_slab_stat_t));
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130
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131 pages = (ngx_uint_t) (size / (ngx_pagesize + sizeof(ngx_slab_page_t)));
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132
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133 pool->pages = (ngx_slab_page_t *) p;
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134 ngx_memzero(pool->pages, pages * sizeof(ngx_slab_page_t));
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135
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136 page = pool->pages;
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137
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138 /* only "next" is used in list head */
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139 pool->free.slab = 0;
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140 pool->free.next = page;
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141 pool->free.prev = 0;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
142
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
143 page->slab = pages;
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
144 page->next = &pool->free;
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
145 page->prev = (uintptr_t) &pool->free;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
146
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
147 pool->start = ngx_align_ptr(p + pages * sizeof(ngx_slab_page_t),
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
148 ngx_pagesize);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
149
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
150 m = pages - (pool->end - pool->start) / ngx_pagesize;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
151 if (m > 0) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
152 pages -= m;
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
153 page->slab = pages;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
154 }
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
155
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
156 pool->last = pool->pages + pages;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
157
5634
5024d29354f1 Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5362
diff changeset
158 pool->log_nomem = 1;
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
159 pool->log_ctx = &pool->zero;
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
160 pool->zero = '\0';
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
161 }
357
e260514b9ad4 nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
162
e260514b9ad4 nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
163
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
164 void *
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
165 ngx_slab_alloc(ngx_slab_pool_t *pool, size_t size)
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
166 {
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
167 void *p;
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
168
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
169 ngx_shmtx_lock(&pool->mutex);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
170
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
171 p = ngx_slab_alloc_locked(pool, size);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
172
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
173 ngx_shmtx_unlock(&pool->mutex);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
174
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
175 return p;
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
176 }
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
177
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
178
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
179 void *
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
180 ngx_slab_alloc_locked(ngx_slab_pool_t *pool, size_t size)
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
181 {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
182 size_t s;
881
5ed08a4c3bd3 fix building on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
183 uintptr_t p, n, m, mask, *bitmap;
5ed08a4c3bd3 fix building on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
184 ngx_uint_t i, slot, shift, map;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
185 ngx_slab_page_t *page, *prev, *slots;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
186
5766
abdb027be9d5 Core: bugfix for the ngx_slab_max_size case.
Jianjun Zheng <codeeply@gmail.com>
parents: 5726
diff changeset
187 if (size > ngx_slab_max_size) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
188
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
189 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0,
967
1cb178720355 style fix
Igor Sysoev <igor@sysoev.ru>
parents: 966
diff changeset
190 "slab alloc: %uz", size);
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
191
4829
40de49cf6b37 Fixed overflow if ngx_slab_alloc() is called with very big "size" argument.
Ruslan Ermilov <ru@nginx.com>
parents: 4764
diff changeset
192 page = ngx_slab_alloc_pages(pool, (size >> ngx_pagesize_shift)
40de49cf6b37 Fixed overflow if ngx_slab_alloc() is called with very big "size" argument.
Ruslan Ermilov <ru@nginx.com>
parents: 4764
diff changeset
193 + ((size % ngx_pagesize) ? 1 : 0));
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
194 if (page) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
195 p = ngx_slab_page_addr(pool, page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
196
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
197 } else {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
198 p = 0;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
199 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
200
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
201 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
202 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
203
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
204 if (size > pool->min_size) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
205 shift = 1;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
206 for (s = size - 1; s >>= 1; shift++) { /* void */ }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
207 slot = shift - pool->min_shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
208
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
209 } else {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
210 shift = pool->min_shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
211 slot = 0;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
212 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
213
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
214 pool->stats[slot].reqs++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
215
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
216 ngx_log_debug2(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0,
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
217 "slab alloc: %uz slot: %ui", size, slot);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
218
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
219 slots = ngx_slab_slots(pool);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
220 page = slots[slot].next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
221
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
222 if (page->next != page) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
223
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
224 if (shift < ngx_slab_exact_shift) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
225
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
226 bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
227
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
228 map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
229
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
230 for (n = 0; n < map; n++) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
231
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
232 if (bitmap[n] != NGX_SLAB_BUSY) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
233
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
234 for (m = 1, i = 0; m; m <<= 1, i++) {
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
235 if (bitmap[n] & m) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
236 continue;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
237 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
238
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
239 bitmap[n] |= m;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
240
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
241 i = (n * sizeof(uintptr_t) * 8 + i) << shift;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
242
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
243 p = (uintptr_t) bitmap + i;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
244
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
245 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
246
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
247 if (bitmap[n] == NGX_SLAB_BUSY) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
248 for (n = n + 1; n < map; n++) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
249 if (bitmap[n] != NGX_SLAB_BUSY) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
250 goto done;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
251 }
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
252 }
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
253
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
254 prev = ngx_slab_page_prev(page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
255 prev->next = page->next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
256 page->next->prev = page->prev;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
257
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
258 page->next = NULL;
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
259 page->prev = NGX_SLAB_SMALL;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
260 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
261
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
262 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
263 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
264 }
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
265 }
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
266
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
267 } else if (shift == ngx_slab_exact_shift) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
268
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
269 for (m = 1, i = 0; m; m <<= 1, i++) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
270 if (page->slab & m) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
271 continue;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
272 }
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
273
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
274 page->slab |= m;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
275
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
276 if (page->slab == NGX_SLAB_BUSY) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
277 prev = ngx_slab_page_prev(page);
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
278 prev->next = page->next;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
279 page->next->prev = page->prev;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
280
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
281 page->next = NULL;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
282 page->prev = NGX_SLAB_EXACT;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
283 }
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
284
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
285 p = ngx_slab_page_addr(pool, page) + (i << shift);
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
286
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
287 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
288
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
289 goto done;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
290 }
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
291
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
292 } else { /* shift > ngx_slab_exact_shift */
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
293
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
294 mask = ((uintptr_t) 1 << (ngx_pagesize >> shift)) - 1;
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
295 mask <<= NGX_SLAB_MAP_SHIFT;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
296
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
297 for (m = (uintptr_t) 1 << NGX_SLAB_MAP_SHIFT, i = 0;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
298 m & mask;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
299 m <<= 1, i++)
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
300 {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
301 if (page->slab & m) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
302 continue;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
303 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
304
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
305 page->slab |= m;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
306
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
307 if ((page->slab & NGX_SLAB_MAP_MASK) == mask) {
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
308 prev = ngx_slab_page_prev(page);
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
309 prev->next = page->next;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
310 page->next->prev = page->prev;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
311
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
312 page->next = NULL;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
313 page->prev = NGX_SLAB_BIG;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
314 }
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
315
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
316 p = ngx_slab_page_addr(pool, page) + (i << shift);
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
317
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
318 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
319
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
320 goto done;
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
321 }
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
322 }
6826
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
323
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
324 ngx_slab_error(pool, NGX_LOG_ALERT, "ngx_slab_alloc(): page is busy");
d0404c9a7675 Slab: simplified allocation from slots.
Ruslan Ermilov <ru@nginx.com>
parents: 6825
diff changeset
325 ngx_debug_point();
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
326 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
327
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
328 page = ngx_slab_alloc_pages(pool, 1);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
329
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
330 if (page) {
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
331 if (shift < ngx_slab_exact_shift) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
332 bitmap = (uintptr_t *) ngx_slab_page_addr(pool, page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
333
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
334 n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
335
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
336 if (n == 0) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
337 n = 1;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
338 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
339
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
340 bitmap[0] = ((uintptr_t) 2 << n) - 1;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
341
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
342 map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
343
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
344 for (i = 1; i < map; i++) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
345 bitmap[i] = 0;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
346 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
347
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
348 page->slab = shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
349 page->next = &slots[slot];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
350 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
351
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
352 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
353
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
354 pool->stats[slot].total += (ngx_pagesize >> shift) - n;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
355
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
356 p = ngx_slab_page_addr(pool, page) + (n << shift);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
357
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
358 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
359
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
360 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
361
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
362 } else if (shift == ngx_slab_exact_shift) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
363
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
364 page->slab = 1;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
365 page->next = &slots[slot];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
366 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
367
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
368 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
369
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
370 pool->stats[slot].total += sizeof(uintptr_t) * 8;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
371
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
372 p = ngx_slab_page_addr(pool, page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
373
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
374 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
375
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
376 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
377
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
378 } else { /* shift > ngx_slab_exact_shift */
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
379
881
5ed08a4c3bd3 fix building on 64-bit platforms
Igor Sysoev <igor@sysoev.ru>
parents: 860
diff changeset
380 page->slab = ((uintptr_t) 1 << NGX_SLAB_MAP_SHIFT) | shift;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
381 page->next = &slots[slot];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
382 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
383
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
384 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
385
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
386 pool->stats[slot].total += ngx_pagesize >> shift;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
387
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
388 p = ngx_slab_page_addr(pool, page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
389
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
390 pool->stats[slot].used++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
391
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
392 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
393 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
394 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
395
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
396 p = 0;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
397
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
398 pool->stats[slot].fails++;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
399
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
400 done:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
401
6480
f01ab2dbcfdc Fixed logging.
Sergey Kandaurov <pluknet@nginx.com>
parents: 6474
diff changeset
402 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0,
f01ab2dbcfdc Fixed logging.
Sergey Kandaurov <pluknet@nginx.com>
parents: 6474
diff changeset
403 "slab alloc: %p", (void *) p);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
404
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
405 return (void *) p;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
406 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
407
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
408
5726
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
409 void *
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
410 ngx_slab_calloc(ngx_slab_pool_t *pool, size_t size)
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
411 {
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
412 void *p;
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
413
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
414 ngx_shmtx_lock(&pool->mutex);
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
415
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
416 p = ngx_slab_calloc_locked(pool, size);
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
417
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
418 ngx_shmtx_unlock(&pool->mutex);
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
419
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
420 return p;
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
421 }
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
422
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
423
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
424 void *
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
425 ngx_slab_calloc_locked(ngx_slab_pool_t *pool, size_t size)
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
426 {
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
427 void *p;
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
428
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
429 p = ngx_slab_alloc_locked(pool, size);
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
430 if (p) {
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
431 ngx_memzero(p, size);
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
432 }
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
433
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
434 return p;
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
435 }
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
436
25ade23cf281 Core: added ngx_slab_calloc() and ngx_slab_calloc_locked().
Ruslan Ermilov <ru@nginx.com>
parents: 5718
diff changeset
437
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
438 void
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
439 ngx_slab_free(ngx_slab_pool_t *pool, void *p)
357
e260514b9ad4 nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
440 {
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
441 ngx_shmtx_lock(&pool->mutex);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
442
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
443 ngx_slab_free_locked(pool, p);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
444
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
445 ngx_shmtx_unlock(&pool->mutex);
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
446 }
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
447
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
448
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
449 void
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
450 ngx_slab_free_locked(ngx_slab_pool_t *pool, void *p)
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
451 {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
452 size_t size;
1018
06306a20b8bb fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 1016
diff changeset
453 uintptr_t slab, m, *bitmap;
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
454 ngx_uint_t i, n, type, slot, shift, map;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
455 ngx_slab_page_t *slots, *page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
456
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
457 ngx_log_debug1(NGX_LOG_DEBUG_ALLOC, ngx_cycle->log, 0, "slab free: %p", p);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
458
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
459 if ((u_char *) p < pool->start || (u_char *) p > pool->end) {
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
460 ngx_slab_error(pool, NGX_LOG_ALERT, "ngx_slab_free(): outside of pool");
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
461 goto fail;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
462 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
463
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
464 n = ((u_char *) p - pool->start) >> ngx_pagesize_shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
465 page = &pool->pages[n];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
466 slab = page->slab;
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
467 type = ngx_slab_page_type(page);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
468
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
469 switch (type) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
470
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
471 case NGX_SLAB_SMALL:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
472
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
473 shift = slab & NGX_SLAB_SHIFT_MASK;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
474 size = 1 << shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
475
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
476 if ((uintptr_t) p & (size - 1)) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
477 goto wrong_chunk;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
478 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
479
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
480 n = ((uintptr_t) p & (ngx_pagesize - 1)) >> shift;
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
481 m = (uintptr_t) 1 << (n % (sizeof(uintptr_t) * 8));
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
482 n /= sizeof(uintptr_t) * 8;
5362
79b9101cecf4 Handling of ngx_int_t != intptr_t case.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4829
diff changeset
483 bitmap = (uintptr_t *)
79b9101cecf4 Handling of ngx_int_t != intptr_t case.
Maxim Dounin <mdounin@mdounin.ru>
parents: 4829
diff changeset
484 ((uintptr_t) p & ~((uintptr_t) ngx_pagesize - 1));
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
485
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
486 if (bitmap[n] & m) {
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
487 slot = shift - pool->min_shift;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
488
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
489 if (page->next == NULL) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
490 slots = ngx_slab_slots(pool);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
491
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
492 page->next = slots[slot].next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
493 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
494
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
495 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_SMALL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
496 page->next->prev = (uintptr_t) page | NGX_SLAB_SMALL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
497 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
498
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
499 bitmap[n] &= ~m;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
500
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
501 n = (ngx_pagesize >> shift) / ((1 << shift) * 8);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
502
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
503 if (n == 0) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
504 n = 1;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
505 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
506
1016
d0e8c81d3bb7 fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 967
diff changeset
507 if (bitmap[0] & ~(((uintptr_t) 1 << n) - 1)) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
508 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
509 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
510
6827
0e61510c56c4 Slab: simplified some math.
Ruslan Ermilov <ru@nginx.com>
parents: 6826
diff changeset
511 map = (ngx_pagesize >> shift) / (sizeof(uintptr_t) * 8);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
512
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
513 for (i = 1; i < map; i++) {
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
514 if (bitmap[i]) {
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
515 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
516 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
517 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
518
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
519 ngx_slab_free_pages(pool, page, 1);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
520
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
521 pool->stats[slot].total -= (ngx_pagesize >> shift) - n;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
522
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
523 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
524 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
525
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
526 goto chunk_already_free;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
527
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
528 case NGX_SLAB_EXACT:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
529
1016
d0e8c81d3bb7 fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 967
diff changeset
530 m = (uintptr_t) 1 <<
d0e8c81d3bb7 fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 967
diff changeset
531 (((uintptr_t) p & (ngx_pagesize - 1)) >> ngx_slab_exact_shift);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
532 size = ngx_slab_exact_size;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
533
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
534 if ((uintptr_t) p & (size - 1)) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
535 goto wrong_chunk;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
536 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
537
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
538 if (slab & m) {
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
539 slot = ngx_slab_exact_shift - pool->min_shift;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
540
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
541 if (slab == NGX_SLAB_BUSY) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
542 slots = ngx_slab_slots(pool);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
543
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
544 page->next = slots[slot].next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
545 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
546
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
547 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_EXACT;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
548 page->next->prev = (uintptr_t) page | NGX_SLAB_EXACT;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
549 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
550
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
551 page->slab &= ~m;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
552
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
553 if (page->slab) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
554 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
555 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
556
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
557 ngx_slab_free_pages(pool, page, 1);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
558
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
559 pool->stats[slot].total -= sizeof(uintptr_t) * 8;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
560
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
561 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
562 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
563
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
564 goto chunk_already_free;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
565
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
566 case NGX_SLAB_BIG:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
567
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
568 shift = slab & NGX_SLAB_SHIFT_MASK;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
569 size = 1 << shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
570
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
571 if ((uintptr_t) p & (size - 1)) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
572 goto wrong_chunk;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
573 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
574
1016
d0e8c81d3bb7 fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 967
diff changeset
575 m = (uintptr_t) 1 << ((((uintptr_t) p & (ngx_pagesize - 1)) >> shift)
d0e8c81d3bb7 fix slab allocator on 64-bit platfroms
Igor Sysoev <igor@sysoev.ru>
parents: 967
diff changeset
576 + NGX_SLAB_MAP_SHIFT);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
577
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
578 if (slab & m) {
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
579 slot = shift - pool->min_shift;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
580
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
581 if (page->next == NULL) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
582 slots = ngx_slab_slots(pool);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
583
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
584 page->next = slots[slot].next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
585 slots[slot].next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
586
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
587 page->prev = (uintptr_t) &slots[slot] | NGX_SLAB_BIG;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
588 page->next->prev = (uintptr_t) page | NGX_SLAB_BIG;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
589 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
590
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
591 page->slab &= ~m;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
592
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
593 if (page->slab & NGX_SLAB_MAP_MASK) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
594 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
595 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
596
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
597 ngx_slab_free_pages(pool, page, 1);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
598
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
599 pool->stats[slot].total -= ngx_pagesize >> shift;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
600
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
601 goto done;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
602 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
603
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
604 goto chunk_already_free;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
605
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
606 case NGX_SLAB_PAGE:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
607
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
608 if ((uintptr_t) p & (ngx_pagesize - 1)) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
609 goto wrong_chunk;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
610 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
611
6809
87d7e640b45d Slab: improved double free detection.
Ruslan Ermilov <ru@nginx.com>
parents: 6808
diff changeset
612 if (!(slab & NGX_SLAB_PAGE_START)) {
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
613 ngx_slab_error(pool, NGX_LOG_ALERT,
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
614 "ngx_slab_free(): page is already free");
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
615 goto fail;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
616 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
617
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
618 if (slab == NGX_SLAB_PAGE_BUSY) {
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
619 ngx_slab_error(pool, NGX_LOG_ALERT,
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
620 "ngx_slab_free(): pointer to wrong page");
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
621 goto fail;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
622 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
623
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
624 n = ((u_char *) p - pool->start) >> ngx_pagesize_shift;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
625 size = slab & ~NGX_SLAB_PAGE_START;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
626
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
627 ngx_slab_free_pages(pool, &pool->pages[n], size);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
628
2711
6b87e875e87a fix building by BCC without NGX_DEBUG_MALLOC
Igor Sysoev <igor@sysoev.ru>
parents: 2611
diff changeset
629 ngx_slab_junk(p, size << ngx_pagesize_shift);
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
630
2711
6b87e875e87a fix building by BCC without NGX_DEBUG_MALLOC
Igor Sysoev <igor@sysoev.ru>
parents: 2611
diff changeset
631 return;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
632 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
633
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
634 /* not reached */
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
635
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
636 return;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
637
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
638 done:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
639
6828
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
640 pool->stats[slot].used--;
99770a5ea14f Slab: slots statistics.
Ruslan Ermilov <ru@nginx.com>
parents: 6827
diff changeset
641
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
642 ngx_slab_junk(p, size);
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
643
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
644 return;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
645
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
646 wrong_chunk:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
647
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
648 ngx_slab_error(pool, NGX_LOG_ALERT,
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
649 "ngx_slab_free(): pointer to wrong chunk");
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
650
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
651 goto fail;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
652
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
653 chunk_already_free:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
654
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
655 ngx_slab_error(pool, NGX_LOG_ALERT,
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
656 "ngx_slab_free(): chunk is already free");
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
657
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
658 fail:
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
659
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
660 return;
357
e260514b9ad4 nginx-0.0.7-2004-06-16-23:36:07 import
Igor Sysoev <igor@sysoev.ru>
parents:
diff changeset
661 }
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
662
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
663
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
664 static ngx_slab_page_t *
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
665 ngx_slab_alloc_pages(ngx_slab_pool_t *pool, ngx_uint_t pages)
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
666 {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
667 ngx_slab_page_t *page, *p;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
668
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
669 for (page = pool->free.next; page != &pool->free; page = page->next) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
670
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
671 if (page->slab >= pages) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
672
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
673 if (page->slab > pages) {
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
674 page[page->slab - 1].prev = (uintptr_t) &page[pages];
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
675
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
676 page[pages].slab = page->slab - pages;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
677 page[pages].next = page->next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
678 page[pages].prev = page->prev;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
679
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
680 p = (ngx_slab_page_t *) page->prev;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
681 p->next = &page[pages];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
682 page->next->prev = (uintptr_t) &page[pages];
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
683
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
684 } else {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
685 p = (ngx_slab_page_t *) page->prev;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
686 p->next = page->next;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
687 page->next->prev = page->prev;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
688 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
689
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
690 page->slab = pages | NGX_SLAB_PAGE_START;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
691 page->next = NULL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
692 page->prev = NGX_SLAB_PAGE;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
693
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
694 if (--pages == 0) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
695 return page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
696 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
697
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
698 for (p = page + 1; pages; pages--) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
699 p->slab = NGX_SLAB_PAGE_BUSY;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
700 p->next = NULL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
701 p->prev = NGX_SLAB_PAGE;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
702 p++;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
703 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
704
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
705 return page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
706 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
707 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
708
5634
5024d29354f1 Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5362
diff changeset
709 if (pool->log_nomem) {
5024d29354f1 Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5362
diff changeset
710 ngx_slab_error(pool, NGX_LOG_CRIT,
5024d29354f1 Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5362
diff changeset
711 "ngx_slab_alloc() failed: no memory");
5024d29354f1 Core: slab log_nomem flag.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5362
diff changeset
712 }
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
713
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
714 return NULL;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
715 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
716
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
717
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
718 static void
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
719 ngx_slab_free_pages(ngx_slab_pool_t *pool, ngx_slab_page_t *page,
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
720 ngx_uint_t pages)
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
721 {
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
722 ngx_slab_page_t *prev, *join;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
723
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
724 page->slab = pages--;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
725
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
726 if (pages) {
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
727 ngx_memzero(&page[1], pages * sizeof(ngx_slab_page_t));
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
728 }
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
729
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
730 if (page->next) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
731 prev = ngx_slab_page_prev(page);
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
732 prev->next = page->next;
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
733 page->next->prev = page->prev;
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
734 }
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
735
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
736 join = page + page->slab;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
737
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
738 if (join < pool->last) {
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
739
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
740 if (ngx_slab_page_type(join) == NGX_SLAB_PAGE) {
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
741
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
742 if (join->next != NULL) {
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
743 pages += join->slab;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
744 page->slab += join->slab;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
745
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
746 prev = ngx_slab_page_prev(join);
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
747 prev->next = join->next;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
748 join->next->prev = join->prev;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
749
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
750 join->slab = NGX_SLAB_PAGE_FREE;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
751 join->next = NULL;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
752 join->prev = NGX_SLAB_PAGE;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
753 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
754 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
755 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
756
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
757 if (page > pool->pages) {
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
758 join = page - 1;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
759
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
760 if (ngx_slab_page_type(join) == NGX_SLAB_PAGE) {
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
761
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
762 if (join->slab == NGX_SLAB_PAGE_FREE) {
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
763 join = ngx_slab_page_prev(join);
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
764 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
765
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
766 if (join->next != NULL) {
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
767 pages += join->slab;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
768 join->slab += page->slab;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
769
6823
88c8c3d65184 Slab: improved code readability.
Ruslan Ermilov <ru@nginx.com>
parents: 6809
diff changeset
770 prev = ngx_slab_page_prev(join);
5718
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
771 prev->next = join->next;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
772 join->next->prev = join->prev;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
773
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
774 page->slab = NGX_SLAB_PAGE_FREE;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
775 page->next = NULL;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
776 page->prev = NGX_SLAB_PAGE;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
777
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
778 page = join;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
779 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
780 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
781 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
782
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
783 if (pages) {
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
784 page[pages].prev = (uintptr_t) page;
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
785 }
c46657e391a3 Core: slab allocator free pages defragmentation.
Maxim Dounin <mdounin@mdounin.ru>
parents: 5634
diff changeset
786
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
787 page->prev = (uintptr_t) &pool->free;
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
788 page->next = pool->free.next;
966
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
789
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
790 page->next->prev = (uintptr_t) page;
715336c243e1 many bug fixes and ngx_slab_alloc_locked()/ngx_slab_free_locked()
Igor Sysoev <igor@sysoev.ru>
parents: 881
diff changeset
791
860
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
792 pool->free.next = page;
201d017ea470 slab allocator in shared memory
Igor Sysoev <igor@sysoev.ru>
parents: 826
diff changeset
793 }
2611
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
794
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
795
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
796 static void
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
797 ngx_slab_error(ngx_slab_pool_t *pool, ngx_uint_t level, char *text)
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
798 {
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
799 ngx_log_error(level, ngx_cycle->log, 0, "%s%s", text, pool->log_ctx);
2bce3f6416c6 improve ngx_slab_alloc() error logging
Igor Sysoev <igor@sysoev.ru>
parents: 2610
diff changeset
800 }