Mercurial > hg > nginx-quic
annotate src/http/ngx_http_cache.h @ 8759:56dec0d4e5b1 quic
QUIC: avoid excessive buffer allocations in stream output.
Previously, when a few bytes were send to a QUIC stream by the application, a
4K buffer was allocated for these bytes. Then a STREAM frame was created and
that entire buffer was used as data for that frame. The frame with the buffer
were in use up until the frame was acked by client. Meanwhile, when more
bytes were send to the stream, more buffers were allocated and assigned as
data to newer STREAM frames. In this scenario most buffer memory is unused.
Now the unused part of the stream output buffer is available for further
stream output while earlier parts of the buffer are waiting to be acked.
This is achieved by splitting the output buffer.
author | Roman Arutyunyan <arut@nginx.com> |
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date | Fri, 24 Dec 2021 18:13:51 +0300 |
parents | 3781de64e747 |
children |
rev | line source |
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441
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1 |
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2 /* |
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3 * Copyright (C) Igor Sysoev |
4412 | 4 * Copyright (C) Nginx, Inc. |
441
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5 */ |
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8 #ifndef _NGX_HTTP_CACHE_H_INCLUDED_ |
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9 #define _NGX_HTTP_CACHE_H_INCLUDED_ |
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12 #include <ngx_config.h> |
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13 #include <ngx_core.h> |
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14 #include <ngx_http.h> |
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18 #define NGX_HTTP_CACHE_BYPASS 2 |
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19 #define NGX_HTTP_CACHE_EXPIRED 3 |
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20 #define NGX_HTTP_CACHE_STALE 4 |
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21 #define NGX_HTTP_CACHE_UPDATING 5 |
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22 #define NGX_HTTP_CACHE_REVALIDATED 6 |
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23 #define NGX_HTTP_CACHE_HIT 7 |
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24 #define NGX_HTTP_CACHE_SCARCE 8 |
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25 |
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26 #define NGX_HTTP_CACHE_KEY_LEN 16 |
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27 #define NGX_HTTP_CACHE_ETAG_LEN 128 |
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28 #define NGX_HTTP_CACHE_VARY_LEN 128 |
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29 |
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30 #define NGX_HTTP_CACHE_VERSION 5 |
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31 |
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33 typedef struct { |
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34 ngx_uint_t status; |
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35 time_t valid; |
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36 } ngx_http_cache_valid_t; |
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37 |
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38 |
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39 typedef struct { |
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40 ngx_rbtree_node_t node; |
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41 ngx_queue_t queue; |
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42 |
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43 u_char key[NGX_HTTP_CACHE_KEY_LEN |
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44 - sizeof(ngx_rbtree_key_t)]; |
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45 |
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46 unsigned count:20; |
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47 unsigned uses:10; |
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48 unsigned valid_msec:10; |
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49 unsigned error:10; |
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50 unsigned exists:1; |
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51 unsigned updating:1; |
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52 unsigned deleting:1; |
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53 unsigned purged:1; |
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54 /* 10 unused bits */ |
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55 |
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56 ngx_file_uniq_t uniq; |
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57 time_t expire; |
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58 time_t valid_sec; |
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59 size_t body_start; |
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60 off_t fs_size; |
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61 ngx_msec_t lock_time; |
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62 } ngx_http_file_cache_node_t; |
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63 |
469 | 64 |
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65 struct ngx_http_cache_s { |
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66 ngx_file_t file; |
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67 ngx_array_t keys; |
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68 uint32_t crc32; |
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69 u_char key[NGX_HTTP_CACHE_KEY_LEN]; |
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70 u_char main[NGX_HTTP_CACHE_KEY_LEN]; |
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71 |
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72 ngx_file_uniq_t uniq; |
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73 time_t valid_sec; |
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74 time_t updating_sec; |
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75 time_t error_sec; |
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76 time_t last_modified; |
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77 time_t date; |
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78 |
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79 ngx_str_t etag; |
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80 ngx_str_t vary; |
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81 u_char variant[NGX_HTTP_CACHE_KEY_LEN]; |
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82 |
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83 size_t buffer_size; |
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84 size_t header_start; |
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85 size_t body_start; |
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86 off_t length; |
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87 off_t fs_size; |
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88 |
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89 ngx_uint_t min_uses; |
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90 ngx_uint_t error; |
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91 ngx_uint_t valid_msec; |
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92 ngx_uint_t vary_tag; |
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93 |
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94 ngx_buf_t *buf; |
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95 |
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96 ngx_http_file_cache_t *file_cache; |
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97 ngx_http_file_cache_node_t *node; |
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98 |
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99 #if (NGX_THREADS || NGX_COMPAT) |
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100 ngx_thread_task_t *thread_task; |
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101 #endif |
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102 |
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103 ngx_msec_t lock_timeout; |
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104 ngx_msec_t lock_age; |
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105 ngx_msec_t lock_time; |
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106 ngx_msec_t wait_time; |
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107 |
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108 ngx_event_t wait_event; |
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109 |
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110 unsigned lock:1; |
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111 unsigned waiting:1; |
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112 |
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113 unsigned updated:1; |
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114 unsigned updating:1; |
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115 unsigned exists:1; |
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116 unsigned temp_file:1; |
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117 unsigned purged:1; |
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118 unsigned reading:1; |
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119 unsigned secondary:1; |
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120 unsigned update_variant:1; |
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121 unsigned background:1; |
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122 |
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123 unsigned stale_updating:1; |
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124 unsigned stale_error:1; |
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125 }; |
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126 |
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127 |
473 | 128 typedef struct { |
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129 ngx_uint_t version; |
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130 time_t valid_sec; |
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131 time_t updating_sec; |
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132 time_t error_sec; |
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133 time_t last_modified; |
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134 time_t date; |
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135 uint32_t crc32; |
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136 u_short valid_msec; |
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137 u_short header_start; |
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138 u_short body_start; |
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139 u_char etag_len; |
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140 u_char etag[NGX_HTTP_CACHE_ETAG_LEN]; |
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141 u_char vary_len; |
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142 u_char vary[NGX_HTTP_CACHE_VARY_LEN]; |
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143 u_char variant[NGX_HTTP_CACHE_KEY_LEN]; |
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144 } ngx_http_file_cache_header_t; |
477 | 145 |
146 | |
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147 typedef struct { |
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148 ngx_rbtree_t rbtree; |
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149 ngx_rbtree_node_t sentinel; |
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150 ngx_queue_t queue; |
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151 ngx_atomic_t cold; |
3018 | 152 ngx_atomic_t loading; |
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153 off_t size; |
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154 ngx_uint_t count; |
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155 ngx_uint_t watermark; |
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156 } ngx_http_file_cache_sh_t; |
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157 |
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158 |
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159 struct ngx_http_file_cache_s { |
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160 ngx_http_file_cache_sh_t *sh; |
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161 ngx_slab_pool_t *shpool; |
469 | 162 |
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163 ngx_path_t *path; |
201
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164 |
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165 off_t min_free; |
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166 off_t max_size; |
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167 size_t bsize; |
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168 |
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169 time_t inactive; |
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170 |
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171 time_t fail_time; |
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172 |
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173 ngx_uint_t files; |
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174 ngx_uint_t loader_files; |
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175 ngx_msec_t last; |
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176 ngx_msec_t loader_sleep; |
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177 ngx_msec_t loader_threshold; |
201
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178 |
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179 ngx_uint_t manager_files; |
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180 ngx_msec_t manager_sleep; |
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181 ngx_msec_t manager_threshold; |
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182 |
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183 ngx_shm_zone_t *shm_zone; |
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184 |
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185 ngx_uint_t use_temp_path; |
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186 /* unsigned use_temp_path:1 */ |
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187 }; |
200
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188 |
197
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189 |
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190 ngx_int_t ngx_http_file_cache_new(ngx_http_request_t *r); |
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191 ngx_int_t ngx_http_file_cache_create(ngx_http_request_t *r); |
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192 void ngx_http_file_cache_create_key(ngx_http_request_t *r); |
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193 ngx_int_t ngx_http_file_cache_open(ngx_http_request_t *r); |
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Cache: update variant while setting header.
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194 ngx_int_t ngx_http_file_cache_set_header(ngx_http_request_t *r, u_char *buf); |
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195 void ngx_http_file_cache_update(ngx_http_request_t *r, ngx_temp_file_t *tf); |
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196 void ngx_http_file_cache_update_header(ngx_http_request_t *r); |
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197 ngx_int_t ngx_http_cache_send(ngx_http_request_t *); |
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198 void ngx_http_file_cache_free(ngx_http_cache_t *c, ngx_temp_file_t *tf); |
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199 time_t ngx_http_file_cache_valid(ngx_array_t *cache_valid, ngx_uint_t status); |
199
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200 |
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201 char *ngx_http_file_cache_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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202 void *conf); |
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203 char *ngx_http_file_cache_valid_set_slot(ngx_conf_t *cf, ngx_command_t *cmd, |
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204 void *conf); |
469 | 205 |
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206 |
2952 | 207 extern ngx_str_t ngx_http_cache_status[]; |
208 | |
199
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209 |
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210 #endif /* _NGX_HTTP_CACHE_H_INCLUDED_ */ |