Mercurial > hg > nginx
annotate src/os/win32/ngx_shmem.c @ 7985:ec2e6893caaa
Simplified sendfile(SF_NODISKIO) usage.
Starting with FreeBSD 11, there is no need to use AIO operations to preload
data into cache for sendfile(SF_NODISKIO) to work. Instead, sendfile()
handles non-blocking loading data from disk by itself. It still can, however,
return EBUSY if a page is already being loaded (for example, by a different
process). If this happens, we now post an event for the next event loop
iteration, so sendfile() is retried "after a short period", as manpage
recommends.
The limit of the number of EBUSY tolerated without any progress is preserved,
but now it does not result in an alert, since on an idle system event loop
iteration might be very short and EBUSY can happen many times in a row.
Instead, SF_NODISKIO is simply disabled for one call once the limit is
reached.
With this change, sendfile(SF_NODISKIO) is now used automatically as long as
sendfile() is enabled, and no longer requires "aio on;".
author | Maxim Dounin <mdounin@mdounin.ru> |
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date | Mon, 27 Dec 2021 19:48:33 +0300 |
parents | af7eba90645d |
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rev | line source |
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605 | 1 |
2 /* | |
3 * Copyright (C) Igor Sysoev | |
4412 | 4 * Copyright (C) Nginx, Inc. |
605 | 5 */ |
6 | |
7 | |
8 #include <ngx_config.h> | |
9 #include <ngx_core.h> | |
10 | |
11 | |
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12 /* |
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13 * Base addresses selected by system for shared memory mappings are likely |
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14 * to be different on Windows Vista and later versions due to address space |
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15 * layout randomization. This is however incompatible with storing absolute |
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16 * addresses within the shared memory. |
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17 * |
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18 * To make it possible to store absolute addresses we create mappings |
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19 * at the same address in all processes by starting mappings at predefined |
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20 * addresses. The addresses were selected somewhat randomly in order to |
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21 * minimize the probability that some other library doing something similar |
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22 * conflicts with us. The addresses are from the following typically free |
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23 * blocks: |
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24 * |
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25 * - 0x10000000 .. 0x70000000 (about 1.5 GB in total) on 32-bit platforms |
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26 * - 0x000000007fff0000 .. 0x000007f68e8b0000 (about 8 TB) on 64-bit platforms |
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27 * |
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28 * Additionally, we allow to change the mapping address once it was detected |
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29 * to be different from one originally used. This is needed to support |
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30 * reconfiguration. |
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31 */ |
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32 |
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33 |
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34 #ifdef _WIN64 |
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35 #define NGX_SHMEM_BASE 0x0000047047e00000 |
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36 #else |
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37 #define NGX_SHMEM_BASE 0x2efe0000 |
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38 #endif |
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39 |
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40 |
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41 ngx_uint_t ngx_allocation_granularity; |
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42 |
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43 |
605 | 44 ngx_int_t |
45 ngx_shm_alloc(ngx_shm_t *shm) | |
46 { | |
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47 u_char *name; |
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48 uint64_t size; |
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49 static u_char *base = (u_char *) NGX_SHMEM_BASE; |
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50 |
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51 name = ngx_alloc(shm->name.len + 2 + NGX_INT32_LEN, shm->log); |
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52 if (name == NULL) { |
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53 return NGX_ERROR; |
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54 } |
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55 |
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56 (void) ngx_sprintf(name, "%V_%s%Z", &shm->name, ngx_unique); |
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57 |
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58 ngx_set_errno(0); |
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59 |
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60 size = shm->size; |
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61 |
605 | 62 shm->handle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, |
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63 (u_long) (size >> 32), |
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64 (u_long) (size & 0xffffffff), |
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65 (char *) name); |
605 | 66 |
67 if (shm->handle == NULL) { | |
68 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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69 "CreateFileMapping(%uz, %s) failed", |
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70 shm->size, name); |
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71 ngx_free(name); |
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72 |
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73 return NGX_ERROR; |
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74 } |
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75 |
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76 ngx_free(name); |
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77 |
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78 if (ngx_errno == ERROR_ALREADY_EXISTS) { |
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79 shm->exists = 1; |
605 | 80 } |
81 | |
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82 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, base); |
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83 |
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84 if (shm->addr != NULL) { |
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85 base += ngx_align(size, ngx_allocation_granularity); |
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86 return NGX_OK; |
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87 } |
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88 |
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89 ngx_log_debug3(NGX_LOG_DEBUG_CORE, shm->log, ngx_errno, |
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90 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed, " |
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91 "retry without a base address", |
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92 shm->size, base, &shm->name); |
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93 |
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94 /* |
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95 * Order of shared memory zones may be different in the master process |
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96 * and worker processes after reconfiguration. As a result, the above |
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97 * may fail due to a conflict with a previously created mapping remapped |
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98 * to a different address. Additionally, there may be a conflict with |
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99 * some other uses of the memory. In this case we retry without a base |
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100 * address to let the system assign the address itself. |
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101 */ |
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102 |
605 | 103 shm->addr = MapViewOfFile(shm->handle, FILE_MAP_WRITE, 0, 0, 0); |
104 | |
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105 if (shm->addr != NULL) { |
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106 return NGX_OK; |
605 | 107 } |
108 | |
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109 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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110 "MapViewOfFile(%uz) of file mapping \"%V\" failed", |
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111 shm->size, &shm->name); |
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112 |
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113 if (CloseHandle(shm->handle) == 0) { |
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114 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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115 "CloseHandle() of file mapping \"%V\" failed", |
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116 &shm->name); |
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117 } |
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118 |
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119 return NGX_ERROR; |
605 | 120 } |
121 | |
122 | |
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123 ngx_int_t |
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124 ngx_shm_remap(ngx_shm_t *shm, u_char *addr) |
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125 { |
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126 if (UnmapViewOfFile(shm->addr) == 0) { |
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127 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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128 "UnmapViewOfFile(%p) of file mapping \"%V\" failed", |
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129 shm->addr, &shm->name); |
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130 return NGX_ERROR; |
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131 } |
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132 |
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133 shm->addr = MapViewOfFileEx(shm->handle, FILE_MAP_WRITE, 0, 0, 0, addr); |
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134 |
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135 if (shm->addr != NULL) { |
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136 return NGX_OK; |
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137 } |
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138 |
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139 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, |
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140 "MapViewOfFileEx(%uz, %p) of file mapping \"%V\" failed", |
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141 shm->size, addr, &shm->name); |
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142 |
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143 return NGX_ERROR; |
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144 } |
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145 |
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146 |
605 | 147 void |
148 ngx_shm_free(ngx_shm_t *shm) | |
149 { | |
150 if (UnmapViewOfFile(shm->addr) == 0) { | |
151 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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152 "UnmapViewOfFile(%p) of file mapping \"%V\" failed", |
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153 shm->addr, &shm->name); |
605 | 154 } |
155 | |
156 if (CloseHandle(shm->handle) == 0) { | |
157 ngx_log_error(NGX_LOG_ALERT, shm->log, ngx_errno, | |
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158 "CloseHandle() of file mapping \"%V\" failed", |
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159 &shm->name); |
605 | 160 } |
161 } |