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cd748f27 | 1 | /* |
bbc27441 | 2 | * Copyright (C) 1996-2014 The Squid Software Foundation and contributors |
cd748f27 | 3 | * |
bbc27441 AJ |
4 | * Squid software is distributed under GPLv2+ license and includes |
5 | * contributions from numerous individuals and organizations. | |
6 | * Please see the COPYING and CONTRIBUTORS files for details. | |
cd748f27 | 7 | */ |
8 | ||
bbc27441 AJ |
9 | /* DEBUG: section 43 AIOPS */ |
10 | ||
e4116bdb | 11 | #ifndef _REENTRANT |
12 | #error "_REENTRANT MUST be defined to build squid async io support." | |
13 | #endif | |
14 | ||
582c2af2 | 15 | #include "squid.h" |
074d6a40 | 16 | #include "DiskIO/DiskThreads/CommIO.h" |
b9ae18aa | 17 | #include "DiskThreads.h" |
4d5904f7 | 18 | #include "SquidConfig.h" |
074d6a40 AJ |
19 | #include "SquidTime.h" |
20 | #include "Store.h" | |
cd748f27 | 21 | |
1a30fdf5 | 22 | #include <cerrno> |
074d6a40 | 23 | #include <csignal> |
4d5904f7 FC |
24 | #include <sys/stat.h> |
25 | #include <fcntl.h> | |
26 | #include <pthread.h> | |
4d5904f7 | 27 | #include <dirent.h> |
cd748f27 | 28 | #if HAVE_SCHED_H |
4d5904f7 | 29 | #include <sched.h> |
cd748f27 | 30 | #endif |
31 | ||
32 | #define RIDICULOUS_LENGTH 4096 | |
33 | ||
c04d4f40 | 34 | enum _squidaio_thread_status { |
cd748f27 | 35 | _THREAD_STARTING = 0, |
36 | _THREAD_WAITING, | |
37 | _THREAD_BUSY, | |
38 | _THREAD_FAILED, | |
39 | _THREAD_DONE | |
40 | }; | |
c04d4f40 | 41 | typedef enum _squidaio_thread_status squidaio_thread_status; |
cd748f27 | 42 | |
26ac0430 | 43 | typedef struct squidaio_request_t { |
62e76326 | 44 | |
c04d4f40 | 45 | struct squidaio_request_t *next; |
46 | squidaio_request_type request_type; | |
cd748f27 | 47 | int cancelled; |
48 | char *path; | |
49 | int oflag; | |
50 | mode_t mode; | |
51 | int fd; | |
52 | char *bufferp; | |
ee139403 | 53 | size_t buflen; |
cd748f27 | 54 | off_t offset; |
55 | int whence; | |
56 | int ret; | |
57 | int err; | |
62e76326 | 58 | |
cd748f27 | 59 | struct stat *tmpstatp; |
62e76326 | 60 | |
cd748f27 | 61 | struct stat *statp; |
c04d4f40 | 62 | squidaio_result_t *resultp; |
2fadd50d | 63 | } squidaio_request_t; |
cd748f27 | 64 | |
26ac0430 | 65 | typedef struct squidaio_request_queue_t { |
55f0e6f7 | 66 | pthread_mutex_t mutex; |
67 | pthread_cond_t cond; | |
c04d4f40 | 68 | squidaio_request_t *volatile head; |
69 | squidaio_request_t *volatile *volatile tailp; | |
55f0e6f7 | 70 | unsigned long requests; |
f0debecb | 71 | unsigned long blocked; /* main failed to lock the queue */ |
2fadd50d | 72 | } squidaio_request_queue_t; |
55f0e6f7 | 73 | |
c04d4f40 | 74 | typedef struct squidaio_thread_t squidaio_thread_t; |
62e76326 | 75 | |
26ac0430 | 76 | struct squidaio_thread_t { |
c04d4f40 | 77 | squidaio_thread_t *next; |
cd748f27 | 78 | pthread_t thread; |
c04d4f40 | 79 | squidaio_thread_status status; |
62e76326 | 80 | |
c04d4f40 | 81 | struct squidaio_request_t *current_req; |
55f0e6f7 | 82 | unsigned long requests; |
83 | }; | |
cd748f27 | 84 | |
c04d4f40 | 85 | static void squidaio_queue_request(squidaio_request_t *); |
86 | static void squidaio_cleanup_request(squidaio_request_t *); | |
d9c252f2 | 87 | void *squidaio_thread_loop(void *); |
c04d4f40 | 88 | static void squidaio_do_open(squidaio_request_t *); |
89 | static void squidaio_do_read(squidaio_request_t *); | |
90 | static void squidaio_do_write(squidaio_request_t *); | |
91 | static void squidaio_do_close(squidaio_request_t *); | |
92 | static void squidaio_do_stat(squidaio_request_t *); | |
efa3acd1 | 93 | static void squidaio_do_unlink(squidaio_request_t *); |
cd748f27 | 94 | #if AIO_OPENDIR |
c04d4f40 | 95 | static void *squidaio_do_opendir(squidaio_request_t *); |
cd748f27 | 96 | #endif |
c04d4f40 | 97 | static void squidaio_debug(squidaio_request_t *); |
98 | static void squidaio_poll_queues(void); | |
cd748f27 | 99 | |
c04d4f40 | 100 | static squidaio_thread_t *threads = NULL; |
101 | static int squidaio_initialised = 0; | |
cd748f27 | 102 | |
58cd5bbd | 103 | #define AIO_LARGE_BUFS 16384 |
104 | #define AIO_MEDIUM_BUFS AIO_LARGE_BUFS >> 1 | |
105 | #define AIO_SMALL_BUFS AIO_LARGE_BUFS >> 2 | |
106 | #define AIO_TINY_BUFS AIO_LARGE_BUFS >> 3 | |
55f0e6f7 | 107 | #define AIO_MICRO_BUFS 128 |
58cd5bbd | 108 | |
a3efa961 | 109 | static MemAllocator *squidaio_large_bufs = NULL; /* 16K */ |
110 | static MemAllocator *squidaio_medium_bufs = NULL; /* 8K */ | |
111 | static MemAllocator *squidaio_small_bufs = NULL; /* 4K */ | |
112 | static MemAllocator *squidaio_tiny_bufs = NULL; /* 2K */ | |
113 | static MemAllocator *squidaio_micro_bufs = NULL; /* 128K */ | |
58cd5bbd | 114 | |
cd748f27 | 115 | static int request_queue_len = 0; |
a3efa961 | 116 | static MemAllocator *squidaio_request_pool = NULL; |
117 | static MemAllocator *squidaio_thread_pool = NULL; | |
c04d4f40 | 118 | static squidaio_request_queue_t request_queue; |
62e76326 | 119 | |
26ac0430 | 120 | static struct { |
c04d4f40 | 121 | squidaio_request_t *head, **tailp; |
62e76326 | 122 | } |
f0debecb | 123 | |
62e76326 | 124 | request_queue2 = { |
125 | ||
26ac0430 AJ |
126 | NULL, &request_queue2.head |
127 | }; | |
c04d4f40 | 128 | static squidaio_request_queue_t done_queue; |
62e76326 | 129 | |
26ac0430 | 130 | static struct { |
c04d4f40 | 131 | squidaio_request_t *head, **tailp; |
62e76326 | 132 | } |
f0debecb | 133 | |
62e76326 | 134 | done_requests = { |
135 | ||
26ac0430 AJ |
136 | NULL, &done_requests.head |
137 | }; | |
cd748f27 | 138 | static pthread_attr_t globattr; |
5e5c622b | 139 | #if HAVE_SCHED_H |
62e76326 | 140 | |
cd748f27 | 141 | static struct sched_param globsched; |
5e5c622b | 142 | #endif |
cd748f27 | 143 | static pthread_t main_thread; |
144 | ||
a3efa961 | 145 | static MemAllocator * |
c04d4f40 | 146 | squidaio_get_pool(int size) |
58cd5bbd | 147 | { |
58cd5bbd | 148 | if (size <= AIO_LARGE_BUFS) { |
62e76326 | 149 | if (size <= AIO_MICRO_BUFS) |
a3efa961 | 150 | return squidaio_micro_bufs; |
62e76326 | 151 | else if (size <= AIO_TINY_BUFS) |
a3efa961 | 152 | return squidaio_tiny_bufs; |
62e76326 | 153 | else if (size <= AIO_SMALL_BUFS) |
a3efa961 | 154 | return squidaio_small_bufs; |
62e76326 | 155 | else if (size <= AIO_MEDIUM_BUFS) |
a3efa961 | 156 | return squidaio_medium_bufs; |
62e76326 | 157 | else |
a3efa961 | 158 | return squidaio_large_bufs; |
159 | } | |
62e76326 | 160 | |
a3efa961 | 161 | return NULL; |
58cd5bbd | 162 | } |
163 | ||
211f1d0b | 164 | void * |
c04d4f40 | 165 | squidaio_xmalloc(int size) |
58cd5bbd | 166 | { |
167 | void *p; | |
a3efa961 | 168 | MemAllocator *pool; |
58cd5bbd | 169 | |
c04d4f40 | 170 | if ((pool = squidaio_get_pool(size)) != NULL) { |
b001e822 | 171 | p = pool->alloc(); |
58cd5bbd | 172 | } else |
62e76326 | 173 | p = xmalloc(size); |
58cd5bbd | 174 | |
175 | return p; | |
176 | } | |
177 | ||
55f0e6f7 | 178 | static char * |
c04d4f40 | 179 | squidaio_xstrdup(const char *str) |
55f0e6f7 | 180 | { |
181 | char *p; | |
f0debecb | 182 | int len = strlen(str) + 1; |
55f0e6f7 | 183 | |
e6ccf245 | 184 | p = (char *)squidaio_xmalloc(len); |
55f0e6f7 | 185 | strncpy(p, str, len); |
186 | ||
187 | return p; | |
188 | } | |
189 | ||
211f1d0b | 190 | void |
c04d4f40 | 191 | squidaio_xfree(void *p, int size) |
58cd5bbd | 192 | { |
a3efa961 | 193 | MemAllocator *pool; |
58cd5bbd | 194 | |
c04d4f40 | 195 | if ((pool = squidaio_get_pool(size)) != NULL) { |
dc47f531 | 196 | pool->freeOne(p); |
58cd5bbd | 197 | } else |
62e76326 | 198 | xfree(p); |
58cd5bbd | 199 | } |
200 | ||
55f0e6f7 | 201 | static void |
c04d4f40 | 202 | squidaio_xstrfree(char *str) |
55f0e6f7 | 203 | { |
a3efa961 | 204 | MemAllocator *pool; |
f0debecb | 205 | int len = strlen(str) + 1; |
55f0e6f7 | 206 | |
c04d4f40 | 207 | if ((pool = squidaio_get_pool(len)) != NULL) { |
dc47f531 | 208 | pool->freeOne(str); |
55f0e6f7 | 209 | } else |
62e76326 | 210 | xfree(str); |
55f0e6f7 | 211 | } |
212 | ||
d06925a4 | 213 | void |
c04d4f40 | 214 | squidaio_init(void) |
cd748f27 | 215 | { |
216 | int i; | |
c04d4f40 | 217 | squidaio_thread_t *threadp; |
cd748f27 | 218 | |
c04d4f40 | 219 | if (squidaio_initialised) |
62e76326 | 220 | return; |
cd748f27 | 221 | |
222 | pthread_attr_init(&globattr); | |
62e76326 | 223 | |
cd748f27 | 224 | #if HAVE_PTHREAD_ATTR_SETSCOPE |
62e76326 | 225 | |
cd748f27 | 226 | pthread_attr_setscope(&globattr, PTHREAD_SCOPE_SYSTEM); |
62e76326 | 227 | |
cd748f27 | 228 | #endif |
5e5c622b | 229 | #if HAVE_SCHED_H |
62e76326 | 230 | |
cd748f27 | 231 | globsched.sched_priority = 1; |
62e76326 | 232 | |
5e5c622b | 233 | #endif |
62e76326 | 234 | |
cd748f27 | 235 | main_thread = pthread_self(); |
62e76326 | 236 | |
5e5c622b | 237 | #if HAVE_SCHED_H && HAVE_PTHREAD_SETSCHEDPARAM |
62e76326 | 238 | |
cd748f27 | 239 | pthread_setschedparam(main_thread, SCHED_OTHER, &globsched); |
62e76326 | 240 | |
cd748f27 | 241 | #endif |
5e5c622b | 242 | #if HAVE_SCHED_H |
62e76326 | 243 | |
cd748f27 | 244 | globsched.sched_priority = 2; |
62e76326 | 245 | |
5e5c622b | 246 | #endif |
247 | #if HAVE_SCHED_H && HAVE_PTHREAD_ATTR_SETSCHEDPARAM | |
62e76326 | 248 | |
cd748f27 | 249 | pthread_attr_setschedparam(&globattr, &globsched); |
62e76326 | 250 | |
cd748f27 | 251 | #endif |
252 | ||
5a3501d2 | 253 | /* Give each thread a smaller 256KB stack, should be more than sufficient */ |
254 | pthread_attr_setstacksize(&globattr, 256 * 1024); | |
255 | ||
55f0e6f7 | 256 | /* Initialize request queue */ |
257 | if (pthread_mutex_init(&(request_queue.mutex), NULL)) | |
62e76326 | 258 | fatal("Failed to create mutex"); |
259 | ||
55f0e6f7 | 260 | if (pthread_cond_init(&(request_queue.cond), NULL)) |
62e76326 | 261 | fatal("Failed to create condition variable"); |
262 | ||
55f0e6f7 | 263 | request_queue.head = NULL; |
62e76326 | 264 | |
55f0e6f7 | 265 | request_queue.tailp = &request_queue.head; |
62e76326 | 266 | |
55f0e6f7 | 267 | request_queue.requests = 0; |
62e76326 | 268 | |
55f0e6f7 | 269 | request_queue.blocked = 0; |
270 | ||
271 | /* Initialize done queue */ | |
272 | if (pthread_mutex_init(&(done_queue.mutex), NULL)) | |
62e76326 | 273 | fatal("Failed to create mutex"); |
274 | ||
55f0e6f7 | 275 | if (pthread_cond_init(&(done_queue.cond), NULL)) |
62e76326 | 276 | fatal("Failed to create condition variable"); |
277 | ||
55f0e6f7 | 278 | done_queue.head = NULL; |
62e76326 | 279 | |
55f0e6f7 | 280 | done_queue.tailp = &done_queue.head; |
62e76326 | 281 | |
55f0e6f7 | 282 | done_queue.requests = 0; |
62e76326 | 283 | |
55f0e6f7 | 284 | done_queue.blocked = 0; |
cd748f27 | 285 | |
45bb0381 AJ |
286 | // Initialize the thread I/O pipes before creating any threads |
287 | // see bug 3189 comment 5 about race conditions. | |
288 | CommIO::Initialize(); | |
289 | ||
55f0e6f7 | 290 | /* Create threads and get them to sit in their wait loop */ |
04eb0689 | 291 | squidaio_thread_pool = memPoolCreate("aio_thread", sizeof(squidaio_thread_t)); |
62e76326 | 292 | |
9fbbe256 | 293 | assert(NUMTHREADS); |
62e76326 | 294 | |
cb4185f1 | 295 | for (i = 0; i < NUMTHREADS; ++i) { |
b001e822 | 296 | threadp = (squidaio_thread_t *)squidaio_thread_pool->alloc(); |
62e76326 | 297 | threadp->status = _THREAD_STARTING; |
298 | threadp->current_req = NULL; | |
299 | threadp->requests = 0; | |
300 | threadp->next = threads; | |
301 | threads = threadp; | |
302 | ||
303 | if (pthread_create(&threadp->thread, &globattr, squidaio_thread_loop, threadp)) { | |
304 | fprintf(stderr, "Thread creation failed\n"); | |
305 | threadp->status = _THREAD_FAILED; | |
306 | continue; | |
307 | } | |
cd748f27 | 308 | } |
309 | ||
310 | /* Create request pool */ | |
04eb0689 | 311 | squidaio_request_pool = memPoolCreate("aio_request", sizeof(squidaio_request_t)); |
62e76326 | 312 | |
04eb0689 | 313 | squidaio_large_bufs = memPoolCreate("squidaio_large_bufs", AIO_LARGE_BUFS); |
62e76326 | 314 | |
04eb0689 | 315 | squidaio_medium_bufs = memPoolCreate("squidaio_medium_bufs", AIO_MEDIUM_BUFS); |
62e76326 | 316 | |
04eb0689 | 317 | squidaio_small_bufs = memPoolCreate("squidaio_small_bufs", AIO_SMALL_BUFS); |
62e76326 | 318 | |
04eb0689 | 319 | squidaio_tiny_bufs = memPoolCreate("squidaio_tiny_bufs", AIO_TINY_BUFS); |
62e76326 | 320 | |
04eb0689 | 321 | squidaio_micro_bufs = memPoolCreate("squidaio_micro_bufs", AIO_MICRO_BUFS); |
c04d4f40 | 322 | |
323 | squidaio_initialised = 1; | |
cd748f27 | 324 | } |
325 | ||
d06925a4 | 326 | void |
327 | squidaio_shutdown(void) | |
328 | { | |
329 | if (!squidaio_initialised) | |
330 | return; | |
331 | ||
332 | /* This is the same as in squidaio_sync */ | |
333 | do { | |
334 | squidaio_poll_queues(); | |
335 | } while (request_queue_len > 0); | |
336 | ||
337 | CommIO::NotifyIOClose(); | |
338 | ||
339 | squidaio_initialised = 0; | |
340 | } | |
cd748f27 | 341 | |
59a09b98 | 342 | void * |
c04d4f40 | 343 | squidaio_thread_loop(void *ptr) |
cd748f27 | 344 | { |
e6ccf245 | 345 | squidaio_thread_t *threadp = (squidaio_thread_t *)ptr; |
c04d4f40 | 346 | squidaio_request_t *request; |
e6ccf245 | 347 | sigset_t newSig; |
cd748f27 | 348 | |
349 | /* | |
350 | * Make sure to ignore signals which may possibly get sent to | |
351 | * the parent squid thread. Causes havoc with mutex's and | |
352 | * condition waits otherwise | |
353 | */ | |
354 | ||
e6ccf245 | 355 | sigemptyset(&newSig); |
356 | sigaddset(&newSig, SIGPIPE); | |
357 | sigaddset(&newSig, SIGCHLD); | |
605f2c3e | 358 | #if defined(_SQUID_LINUX_THREADS_) |
62e76326 | 359 | |
e6ccf245 | 360 | sigaddset(&newSig, SIGQUIT); |
361 | sigaddset(&newSig, SIGTRAP); | |
cd748f27 | 362 | #else |
62e76326 | 363 | |
e6ccf245 | 364 | sigaddset(&newSig, SIGUSR1); |
365 | sigaddset(&newSig, SIGUSR2); | |
cd748f27 | 366 | #endif |
62e76326 | 367 | |
e6ccf245 | 368 | sigaddset(&newSig, SIGHUP); |
369 | sigaddset(&newSig, SIGTERM); | |
370 | sigaddset(&newSig, SIGINT); | |
371 | sigaddset(&newSig, SIGALRM); | |
372 | pthread_sigmask(SIG_BLOCK, &newSig, NULL); | |
cd748f27 | 373 | |
cd748f27 | 374 | while (1) { |
62e76326 | 375 | threadp->current_req = request = NULL; |
376 | request = NULL; | |
377 | /* Get a request to process */ | |
378 | threadp->status = _THREAD_WAITING; | |
379 | pthread_mutex_lock(&request_queue.mutex); | |
380 | ||
381 | while (!request_queue.head) { | |
382 | pthread_cond_wait(&request_queue.cond, &request_queue.mutex); | |
383 | } | |
384 | ||
385 | request = request_queue.head; | |
386 | ||
387 | if (request) | |
388 | request_queue.head = request->next; | |
389 | ||
390 | if (!request_queue.head) | |
391 | request_queue.tailp = &request_queue.head; | |
392 | ||
393 | pthread_mutex_unlock(&request_queue.mutex); | |
394 | ||
395 | /* process the request */ | |
396 | threadp->status = _THREAD_BUSY; | |
397 | ||
398 | request->next = NULL; | |
399 | ||
400 | threadp->current_req = request; | |
401 | ||
402 | errno = 0; | |
403 | ||
404 | if (!request->cancelled) { | |
405 | switch (request->request_type) { | |
406 | ||
407 | case _AIO_OP_OPEN: | |
408 | squidaio_do_open(request); | |
409 | break; | |
410 | ||
411 | case _AIO_OP_READ: | |
412 | squidaio_do_read(request); | |
413 | break; | |
414 | ||
415 | case _AIO_OP_WRITE: | |
416 | squidaio_do_write(request); | |
417 | break; | |
418 | ||
419 | case _AIO_OP_CLOSE: | |
420 | squidaio_do_close(request); | |
421 | break; | |
422 | ||
efa3acd1 | 423 | case _AIO_OP_UNLINK: |
424 | squidaio_do_unlink(request); | |
425 | break; | |
426 | ||
cd748f27 | 427 | #if AIO_OPENDIR /* Opendir not implemented yet */ |
62e76326 | 428 | |
429 | case _AIO_OP_OPENDIR: | |
430 | squidaio_do_opendir(request); | |
431 | break; | |
cd748f27 | 432 | #endif |
62e76326 | 433 | |
434 | case _AIO_OP_STAT: | |
435 | squidaio_do_stat(request); | |
436 | break; | |
437 | ||
438 | default: | |
439 | request->ret = -1; | |
440 | request->err = EINVAL; | |
441 | break; | |
442 | } | |
443 | } else { /* cancelled */ | |
444 | request->ret = -1; | |
445 | request->err = EINTR; | |
446 | } | |
447 | ||
448 | threadp->status = _THREAD_DONE; | |
449 | /* put the request in the done queue */ | |
450 | pthread_mutex_lock(&done_queue.mutex); | |
451 | *done_queue.tailp = request; | |
452 | done_queue.tailp = &request->next; | |
453 | pthread_mutex_unlock(&done_queue.mutex); | |
454 | CommIO::NotifyIOCompleted(); | |
cb4185f1 | 455 | ++ threadp->requests; |
55f0e6f7 | 456 | } /* while forever */ |
62e76326 | 457 | |
cd748f27 | 458 | return NULL; |
c04d4f40 | 459 | } /* squidaio_thread_loop */ |
cd748f27 | 460 | |
461 | static void | |
c04d4f40 | 462 | squidaio_queue_request(squidaio_request_t * request) |
cd748f27 | 463 | { |
cd748f27 | 464 | static int high_start = 0; |
bf8fe701 | 465 | debugs(43, 9, "squidaio_queue_request: " << request << " type=" << request->request_type << " result=" << request->resultp); |
cd748f27 | 466 | /* Mark it as not executed (failing result, no error) */ |
55f0e6f7 | 467 | request->ret = -1; |
468 | request->err = 0; | |
469 | /* Internal housekeeping */ | |
470 | request_queue_len += 1; | |
471 | request->resultp->_data = request; | |
472 | /* Play some tricks with the request_queue2 queue */ | |
473 | request->next = NULL; | |
62e76326 | 474 | |
40173038 | 475 | if (pthread_mutex_trylock(&request_queue.mutex) == 0) { |
62e76326 | 476 | if (request_queue2.head) { |
477 | /* Grab blocked requests */ | |
478 | *request_queue.tailp = request_queue2.head; | |
479 | request_queue.tailp = request_queue2.tailp; | |
480 | } | |
481 | ||
482 | /* Enqueue request */ | |
483 | *request_queue.tailp = request; | |
484 | ||
485 | request_queue.tailp = &request->next; | |
486 | ||
487 | pthread_cond_signal(&request_queue.cond); | |
488 | ||
489 | pthread_mutex_unlock(&request_queue.mutex); | |
490 | ||
491 | if (request_queue2.head) { | |
492 | /* Clear queue of blocked requests */ | |
493 | request_queue2.head = NULL; | |
494 | request_queue2.tailp = &request_queue2.head; | |
495 | } | |
40173038 | 496 | } else { |
62e76326 | 497 | /* Oops, the request queue is blocked, use request_queue2 */ |
498 | *request_queue2.tailp = request; | |
499 | request_queue2.tailp = &request->next; | |
55f0e6f7 | 500 | } |
62e76326 | 501 | |
55f0e6f7 | 502 | if (request_queue2.head) { |
62e76326 | 503 | static int filter = 0; |
504 | static int filter_limit = 8; | |
505 | ||
506 | if (++filter >= filter_limit) { | |
507 | filter_limit += filter; | |
508 | filter = 0; | |
e0236918 | 509 | debugs(43, DBG_IMPORTANT, "squidaio_queue_request: WARNING - Queue congestion"); |
62e76326 | 510 | } |
cd748f27 | 511 | } |
62e76326 | 512 | |
cd748f27 | 513 | /* Warn if out of threads */ |
55f0e6f7 | 514 | if (request_queue_len > MAGIC1) { |
62e76326 | 515 | static int last_warn = 0; |
516 | static int queue_high, queue_low; | |
517 | ||
518 | if (high_start == 0) { | |
519 | high_start = squid_curtime; | |
520 | queue_high = request_queue_len; | |
521 | queue_low = request_queue_len; | |
522 | } | |
523 | ||
524 | if (request_queue_len > queue_high) | |
525 | queue_high = request_queue_len; | |
526 | ||
527 | if (request_queue_len < queue_low) | |
528 | queue_low = request_queue_len; | |
529 | ||
530 | if (squid_curtime >= (last_warn + 15) && | |
531 | squid_curtime >= (high_start + 5)) { | |
e0236918 | 532 | debugs(43, DBG_IMPORTANT, "squidaio_queue_request: WARNING - Disk I/O overloading"); |
62e76326 | 533 | |
534 | if (squid_curtime >= (high_start + 15)) | |
e0236918 | 535 | debugs(43, DBG_IMPORTANT, "squidaio_queue_request: Queue Length: current=" << |
bf8fe701 | 536 | request_queue_len << ", high=" << queue_high << |
537 | ", low=" << queue_low << ", duration=" << | |
538 | (long int) (squid_curtime - high_start)); | |
62e76326 | 539 | |
540 | last_warn = squid_curtime; | |
541 | } | |
cd748f27 | 542 | } else { |
62e76326 | 543 | high_start = 0; |
cd748f27 | 544 | } |
62e76326 | 545 | |
55f0e6f7 | 546 | /* Warn if seriously overloaded */ |
cd748f27 | 547 | if (request_queue_len > RIDICULOUS_LENGTH) { |
fa84c01d FC |
548 | debugs(43, DBG_CRITICAL, "squidaio_queue_request: Async request queue growing uncontrollably!"); |
549 | debugs(43, DBG_CRITICAL, "squidaio_queue_request: Syncing pending I/O operations.. (blocking)"); | |
62e76326 | 550 | squidaio_sync(); |
fa84c01d | 551 | debugs(43, DBG_CRITICAL, "squidaio_queue_request: Synced"); |
cd748f27 | 552 | } |
c04d4f40 | 553 | } /* squidaio_queue_request */ |
cd748f27 | 554 | |
cd748f27 | 555 | static void |
c04d4f40 | 556 | squidaio_cleanup_request(squidaio_request_t * requestp) |
cd748f27 | 557 | { |
c04d4f40 | 558 | squidaio_result_t *resultp = requestp->resultp; |
cd748f27 | 559 | int cancelled = requestp->cancelled; |
560 | ||
561 | /* Free allocated structures and copy data back to user space if the */ | |
562 | /* request hasn't been cancelled */ | |
62e76326 | 563 | |
cd748f27 | 564 | switch (requestp->request_type) { |
62e76326 | 565 | |
cd748f27 | 566 | case _AIO_OP_STAT: |
62e76326 | 567 | |
568 | if (!cancelled && requestp->ret == 0) | |
41d00cd3 | 569 | memcpy(requestp->statp, requestp->tmpstatp, sizeof(struct stat)); |
62e76326 | 570 | |
571 | squidaio_xfree(requestp->tmpstatp, sizeof(struct stat)); | |
572 | ||
573 | squidaio_xstrfree(requestp->path); | |
574 | ||
575 | break; | |
576 | ||
cd748f27 | 577 | case _AIO_OP_OPEN: |
62e76326 | 578 | if (cancelled && requestp->ret >= 0) |
579 | /* The open() was cancelled but completed */ | |
580 | close(requestp->ret); | |
581 | ||
582 | squidaio_xstrfree(requestp->path); | |
583 | ||
584 | break; | |
585 | ||
cd748f27 | 586 | case _AIO_OP_CLOSE: |
62e76326 | 587 | if (cancelled && requestp->ret < 0) |
588 | /* The close() was cancelled and never got executed */ | |
589 | close(requestp->fd); | |
590 | ||
591 | break; | |
592 | ||
cd748f27 | 593 | case _AIO_OP_UNLINK: |
62e76326 | 594 | |
cd748f27 | 595 | case _AIO_OP_OPENDIR: |
62e76326 | 596 | squidaio_xstrfree(requestp->path); |
597 | ||
598 | break; | |
599 | ||
cd748f27 | 600 | case _AIO_OP_READ: |
62e76326 | 601 | break; |
602 | ||
cd748f27 | 603 | case _AIO_OP_WRITE: |
62e76326 | 604 | break; |
605 | ||
cd748f27 | 606 | default: |
62e76326 | 607 | break; |
cd748f27 | 608 | } |
62e76326 | 609 | |
cd748f27 | 610 | if (resultp != NULL && !cancelled) { |
62e76326 | 611 | resultp->aio_return = requestp->ret; |
612 | resultp->aio_errno = requestp->err; | |
cd748f27 | 613 | } |
62e76326 | 614 | |
dc47f531 | 615 | squidaio_request_pool->freeOne(requestp); |
c04d4f40 | 616 | } /* squidaio_cleanup_request */ |
cd748f27 | 617 | |
cd748f27 | 618 | int |
c04d4f40 | 619 | squidaio_cancel(squidaio_result_t * resultp) |
cd748f27 | 620 | { |
e6ccf245 | 621 | squidaio_request_t *request = (squidaio_request_t *)resultp->_data; |
cd748f27 | 622 | |
55f0e6f7 | 623 | if (request && request->resultp == resultp) { |
bf8fe701 | 624 | debugs(43, 9, "squidaio_cancel: " << request << " type=" << request->request_type << " result=" << request->resultp); |
62e76326 | 625 | request->cancelled = 1; |
626 | request->resultp = NULL; | |
627 | resultp->_data = NULL; | |
628 | resultp->result_type = _AIO_OP_NONE; | |
629 | return 0; | |
55f0e6f7 | 630 | } |
62e76326 | 631 | |
cd748f27 | 632 | return 1; |
c04d4f40 | 633 | } /* squidaio_cancel */ |
cd748f27 | 634 | |
cd748f27 | 635 | int |
c04d4f40 | 636 | squidaio_open(const char *path, int oflag, mode_t mode, squidaio_result_t * resultp) |
cd748f27 | 637 | { |
e65c313f | 638 | squidaio_init(); |
c04d4f40 | 639 | squidaio_request_t *requestp; |
cd748f27 | 640 | |
b001e822 | 641 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 642 | |
c04d4f40 | 643 | requestp->path = (char *) squidaio_xstrdup(path); |
62e76326 | 644 | |
cd748f27 | 645 | requestp->oflag = oflag; |
62e76326 | 646 | |
cd748f27 | 647 | requestp->mode = mode; |
62e76326 | 648 | |
cd748f27 | 649 | requestp->resultp = resultp; |
62e76326 | 650 | |
cd748f27 | 651 | requestp->request_type = _AIO_OP_OPEN; |
62e76326 | 652 | |
cd748f27 | 653 | requestp->cancelled = 0; |
62e76326 | 654 | |
12e137b0 | 655 | resultp->result_type = _AIO_OP_OPEN; |
cd748f27 | 656 | |
c04d4f40 | 657 | squidaio_queue_request(requestp); |
62e76326 | 658 | |
cd748f27 | 659 | return 0; |
660 | } | |
661 | ||
cd748f27 | 662 | static void |
c04d4f40 | 663 | squidaio_do_open(squidaio_request_t * requestp) |
cd748f27 | 664 | { |
665 | requestp->ret = open(requestp->path, requestp->oflag, requestp->mode); | |
666 | requestp->err = errno; | |
667 | } | |
668 | ||
cd748f27 | 669 | int |
ee139403 | 670 | squidaio_read(int fd, char *bufp, size_t bufs, off_t offset, int whence, squidaio_result_t * resultp) |
cd748f27 | 671 | { |
c04d4f40 | 672 | squidaio_request_t *requestp; |
cd748f27 | 673 | |
b001e822 | 674 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 675 | |
cd748f27 | 676 | requestp->fd = fd; |
62e76326 | 677 | |
cd748f27 | 678 | requestp->bufferp = bufp; |
62e76326 | 679 | |
cd748f27 | 680 | requestp->buflen = bufs; |
62e76326 | 681 | |
cd748f27 | 682 | requestp->offset = offset; |
62e76326 | 683 | |
cd748f27 | 684 | requestp->whence = whence; |
62e76326 | 685 | |
cd748f27 | 686 | requestp->resultp = resultp; |
62e76326 | 687 | |
cd748f27 | 688 | requestp->request_type = _AIO_OP_READ; |
62e76326 | 689 | |
cd748f27 | 690 | requestp->cancelled = 0; |
62e76326 | 691 | |
12e137b0 | 692 | resultp->result_type = _AIO_OP_READ; |
cd748f27 | 693 | |
c04d4f40 | 694 | squidaio_queue_request(requestp); |
62e76326 | 695 | |
cd748f27 | 696 | return 0; |
697 | } | |
698 | ||
cd748f27 | 699 | static void |
c04d4f40 | 700 | squidaio_do_read(squidaio_request_t * requestp) |
cd748f27 | 701 | { |
e19994df TH |
702 | if (lseek(requestp->fd, requestp->offset, requestp->whence) >= 0) |
703 | requestp->ret = read(requestp->fd, requestp->bufferp, requestp->buflen); | |
704 | else | |
705 | requestp->ret = -1; | |
cd748f27 | 706 | requestp->err = errno; |
707 | } | |
708 | ||
cd748f27 | 709 | int |
ee139403 | 710 | squidaio_write(int fd, char *bufp, size_t bufs, off_t offset, int whence, squidaio_result_t * resultp) |
cd748f27 | 711 | { |
c04d4f40 | 712 | squidaio_request_t *requestp; |
cd748f27 | 713 | |
b001e822 | 714 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 715 | |
cd748f27 | 716 | requestp->fd = fd; |
62e76326 | 717 | |
d06925a4 | 718 | requestp->bufferp = bufp; |
62e76326 | 719 | |
cd748f27 | 720 | requestp->buflen = bufs; |
62e76326 | 721 | |
cd748f27 | 722 | requestp->offset = offset; |
62e76326 | 723 | |
cd748f27 | 724 | requestp->whence = whence; |
62e76326 | 725 | |
cd748f27 | 726 | requestp->resultp = resultp; |
62e76326 | 727 | |
cd748f27 | 728 | requestp->request_type = _AIO_OP_WRITE; |
62e76326 | 729 | |
cd748f27 | 730 | requestp->cancelled = 0; |
62e76326 | 731 | |
12e137b0 | 732 | resultp->result_type = _AIO_OP_WRITE; |
cd748f27 | 733 | |
c04d4f40 | 734 | squidaio_queue_request(requestp); |
62e76326 | 735 | |
cd748f27 | 736 | return 0; |
737 | } | |
738 | ||
cd748f27 | 739 | static void |
c04d4f40 | 740 | squidaio_do_write(squidaio_request_t * requestp) |
cd748f27 | 741 | { |
d06925a4 | 742 | requestp->ret = write(requestp->fd, requestp->bufferp, requestp->buflen); |
cd748f27 | 743 | requestp->err = errno; |
744 | } | |
745 | ||
cd748f27 | 746 | int |
c04d4f40 | 747 | squidaio_close(int fd, squidaio_result_t * resultp) |
cd748f27 | 748 | { |
c04d4f40 | 749 | squidaio_request_t *requestp; |
cd748f27 | 750 | |
b001e822 | 751 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 752 | |
cd748f27 | 753 | requestp->fd = fd; |
62e76326 | 754 | |
cd748f27 | 755 | requestp->resultp = resultp; |
62e76326 | 756 | |
cd748f27 | 757 | requestp->request_type = _AIO_OP_CLOSE; |
62e76326 | 758 | |
cd748f27 | 759 | requestp->cancelled = 0; |
62e76326 | 760 | |
12e137b0 | 761 | resultp->result_type = _AIO_OP_CLOSE; |
cd748f27 | 762 | |
c04d4f40 | 763 | squidaio_queue_request(requestp); |
62e76326 | 764 | |
cd748f27 | 765 | return 0; |
766 | } | |
767 | ||
cd748f27 | 768 | static void |
c04d4f40 | 769 | squidaio_do_close(squidaio_request_t * requestp) |
cd748f27 | 770 | { |
771 | requestp->ret = close(requestp->fd); | |
772 | requestp->err = errno; | |
773 | } | |
774 | ||
cd748f27 | 775 | int |
62e76326 | 776 | |
c04d4f40 | 777 | squidaio_stat(const char *path, struct stat *sb, squidaio_result_t * resultp) |
cd748f27 | 778 | { |
e65c313f | 779 | squidaio_init(); |
c04d4f40 | 780 | squidaio_request_t *requestp; |
cd748f27 | 781 | |
b001e822 | 782 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 783 | |
c04d4f40 | 784 | requestp->path = (char *) squidaio_xstrdup(path); |
62e76326 | 785 | |
cd748f27 | 786 | requestp->statp = sb; |
62e76326 | 787 | |
c04d4f40 | 788 | requestp->tmpstatp = (struct stat *) squidaio_xmalloc(sizeof(struct stat)); |
62e76326 | 789 | |
cd748f27 | 790 | requestp->resultp = resultp; |
62e76326 | 791 | |
cd748f27 | 792 | requestp->request_type = _AIO_OP_STAT; |
62e76326 | 793 | |
cd748f27 | 794 | requestp->cancelled = 0; |
62e76326 | 795 | |
12e137b0 | 796 | resultp->result_type = _AIO_OP_STAT; |
cd748f27 | 797 | |
c04d4f40 | 798 | squidaio_queue_request(requestp); |
62e76326 | 799 | |
cd748f27 | 800 | return 0; |
801 | } | |
802 | ||
cd748f27 | 803 | static void |
c04d4f40 | 804 | squidaio_do_stat(squidaio_request_t * requestp) |
cd748f27 | 805 | { |
806 | requestp->ret = stat(requestp->path, requestp->tmpstatp); | |
807 | requestp->err = errno; | |
808 | } | |
809 | ||
15a47d1d | 810 | int |
efa3acd1 | 811 | squidaio_unlink(const char *path, squidaio_result_t * resultp) |
15a47d1d | 812 | { |
e65c313f | 813 | squidaio_init(); |
c04d4f40 | 814 | squidaio_request_t *requestp; |
15a47d1d | 815 | |
b001e822 | 816 | requestp = (squidaio_request_t *)squidaio_request_pool->alloc(); |
62e76326 | 817 | |
efa3acd1 | 818 | requestp->path = squidaio_xstrdup(path); |
62e76326 | 819 | |
15a47d1d | 820 | requestp->resultp = resultp; |
62e76326 | 821 | |
efa3acd1 | 822 | requestp->request_type = _AIO_OP_UNLINK; |
62e76326 | 823 | |
15a47d1d | 824 | requestp->cancelled = 0; |
62e76326 | 825 | |
efa3acd1 | 826 | resultp->result_type = _AIO_OP_UNLINK; |
15a47d1d | 827 | |
c04d4f40 | 828 | squidaio_queue_request(requestp); |
62e76326 | 829 | |
15a47d1d | 830 | return 0; |
831 | } | |
832 | ||
15a47d1d | 833 | static void |
efa3acd1 | 834 | squidaio_do_unlink(squidaio_request_t * requestp) |
15a47d1d | 835 | { |
efa3acd1 | 836 | requestp->ret = unlink(requestp->path); |
15a47d1d | 837 | requestp->err = errno; |
838 | } | |
839 | ||
cd748f27 | 840 | #if AIO_OPENDIR |
c04d4f40 | 841 | /* XXX squidaio_opendir NOT implemented yet.. */ |
cd748f27 | 842 | |
843 | int | |
c04d4f40 | 844 | squidaio_opendir(const char *path, squidaio_result_t * resultp) |
cd748f27 | 845 | { |
c04d4f40 | 846 | squidaio_request_t *requestp; |
cd748f27 | 847 | int len; |
848 | ||
b001e822 | 849 | requestp = squidaio_request_pool->alloc(); |
62e76326 | 850 | |
12e137b0 | 851 | resultp->result_type = _AIO_OP_OPENDIR; |
62e76326 | 852 | |
cd748f27 | 853 | return -1; |
854 | } | |
855 | ||
856 | static void | |
c04d4f40 | 857 | squidaio_do_opendir(squidaio_request_t * requestp) |
cd748f27 | 858 | { |
859 | /* NOT IMPLEMENTED */ | |
860 | } | |
861 | ||
862 | #endif | |
863 | ||
55f0e6f7 | 864 | static void |
c04d4f40 | 865 | squidaio_poll_queues(void) |
55f0e6f7 | 866 | { |
867 | /* kick "overflow" request queue */ | |
62e76326 | 868 | |
55f0e6f7 | 869 | if (request_queue2.head && |
62e76326 | 870 | pthread_mutex_trylock(&request_queue.mutex) == 0) { |
871 | *request_queue.tailp = request_queue2.head; | |
872 | request_queue.tailp = request_queue2.tailp; | |
873 | pthread_cond_signal(&request_queue.cond); | |
874 | pthread_mutex_unlock(&request_queue.mutex); | |
875 | request_queue2.head = NULL; | |
876 | request_queue2.tailp = &request_queue2.head; | |
55f0e6f7 | 877 | } |
62e76326 | 878 | |
55f0e6f7 | 879 | /* poll done queue */ |
880 | if (done_queue.head && pthread_mutex_trylock(&done_queue.mutex) == 0) { | |
62e76326 | 881 | |
882 | struct squidaio_request_t *requests = done_queue.head; | |
883 | done_queue.head = NULL; | |
884 | done_queue.tailp = &done_queue.head; | |
885 | pthread_mutex_unlock(&done_queue.mutex); | |
886 | *done_requests.tailp = requests; | |
887 | request_queue_len -= 1; | |
888 | ||
889 | while (requests->next) { | |
890 | requests = requests->next; | |
891 | request_queue_len -= 1; | |
892 | } | |
893 | ||
894 | done_requests.tailp = &requests->next; | |
55f0e6f7 | 895 | } |
55f0e6f7 | 896 | } |
cd748f27 | 897 | |
c04d4f40 | 898 | squidaio_result_t * |
899 | squidaio_poll_done(void) | |
cd748f27 | 900 | { |
c04d4f40 | 901 | squidaio_request_t *request; |
902 | squidaio_result_t *resultp; | |
cd748f27 | 903 | int cancelled; |
55f0e6f7 | 904 | int polled = 0; |
cd748f27 | 905 | |
62e76326 | 906 | AIO_REPOLL: |
55f0e6f7 | 907 | request = done_requests.head; |
62e76326 | 908 | |
55f0e6f7 | 909 | if (request == NULL && !polled) { |
62e76326 | 910 | CommIO::ResetNotifications(); |
911 | squidaio_poll_queues(); | |
912 | polled = 1; | |
913 | request = done_requests.head; | |
55f0e6f7 | 914 | } |
62e76326 | 915 | |
55f0e6f7 | 916 | if (!request) { |
62e76326 | 917 | return NULL; |
cd748f27 | 918 | } |
62e76326 | 919 | |
bf8fe701 | 920 | debugs(43, 9, "squidaio_poll_done: " << request << " type=" << request->request_type << " result=" << request->resultp); |
55f0e6f7 | 921 | done_requests.head = request->next; |
62e76326 | 922 | |
55f0e6f7 | 923 | if (!done_requests.head) |
62e76326 | 924 | done_requests.tailp = &done_requests.head; |
925 | ||
55f0e6f7 | 926 | resultp = request->resultp; |
62e76326 | 927 | |
55f0e6f7 | 928 | cancelled = request->cancelled; |
62e76326 | 929 | |
c04d4f40 | 930 | squidaio_debug(request); |
62e76326 | 931 | |
bf8fe701 | 932 | debugs(43, 5, "DONE: " << request->ret << " -> " << request->err); |
62e76326 | 933 | |
c04d4f40 | 934 | squidaio_cleanup_request(request); |
62e76326 | 935 | |
cd748f27 | 936 | if (cancelled) |
62e76326 | 937 | goto AIO_REPOLL; |
938 | ||
cd748f27 | 939 | return resultp; |
c04d4f40 | 940 | } /* squidaio_poll_done */ |
cd748f27 | 941 | |
942 | int | |
c04d4f40 | 943 | squidaio_operations_pending(void) |
cd748f27 | 944 | { |
55f0e6f7 | 945 | return request_queue_len + (done_requests.head ? 1 : 0); |
cd748f27 | 946 | } |
947 | ||
948 | int | |
c04d4f40 | 949 | squidaio_sync(void) |
cd748f27 | 950 | { |
55f0e6f7 | 951 | /* XXX This might take a while if the queue is large.. */ |
62e76326 | 952 | |
cd748f27 | 953 | do { |
62e76326 | 954 | squidaio_poll_queues(); |
cd748f27 | 955 | } while (request_queue_len > 0); |
62e76326 | 956 | |
c04d4f40 | 957 | return squidaio_operations_pending(); |
cd748f27 | 958 | } |
959 | ||
960 | int | |
c04d4f40 | 961 | squidaio_get_queue_len(void) |
cd748f27 | 962 | { |
963 | return request_queue_len; | |
964 | } | |
965 | ||
966 | static void | |
c04d4f40 | 967 | squidaio_debug(squidaio_request_t * request) |
cd748f27 | 968 | { |
55f0e6f7 | 969 | switch (request->request_type) { |
62e76326 | 970 | |
cd748f27 | 971 | case _AIO_OP_OPEN: |
bf8fe701 | 972 | debugs(43, 5, "OPEN of " << request->path << " to FD " << request->ret); |
62e76326 | 973 | break; |
974 | ||
cd748f27 | 975 | case _AIO_OP_READ: |
bf8fe701 | 976 | debugs(43, 5, "READ on fd: " << request->fd); |
62e76326 | 977 | break; |
978 | ||
cd748f27 | 979 | case _AIO_OP_WRITE: |
bf8fe701 | 980 | debugs(43, 5, "WRITE on fd: " << request->fd); |
62e76326 | 981 | break; |
982 | ||
cd748f27 | 983 | case _AIO_OP_CLOSE: |
bf8fe701 | 984 | debugs(43, 5, "CLOSE of fd: " << request->fd); |
62e76326 | 985 | break; |
986 | ||
cd748f27 | 987 | case _AIO_OP_UNLINK: |
bf8fe701 | 988 | debugs(43, 5, "UNLINK of " << request->path); |
62e76326 | 989 | break; |
990 | ||
cd748f27 | 991 | default: |
62e76326 | 992 | break; |
cd748f27 | 993 | } |
994 | } | |
b0465494 | 995 | |
996 | void | |
997 | squidaio_stats(StoreEntry * sentry) | |
998 | { | |
999 | squidaio_thread_t *threadp; | |
1000 | int i; | |
1001 | ||
1002 | if (!squidaio_initialised) | |
1003 | return; | |
1004 | ||
1005 | storeAppendPrintf(sentry, "\n\nThreads Status:\n"); | |
1006 | ||
1007 | storeAppendPrintf(sentry, "#\tID\t# Requests\n"); | |
1008 | ||
1009 | threadp = threads; | |
1010 | ||
cb4185f1 | 1011 | for (i = 0; i < NUMTHREADS; ++i) { |
691aef5a | 1012 | storeAppendPrintf(sentry, "%i\t0x%lx\t%ld\n", i + 1, (unsigned long)threadp->thread, threadp->requests); |
b0465494 | 1013 | threadp = threadp->next; |
1014 | } | |
1015 | } |