backend.c

   1 /*
   2  * fio - the flexible io tester
   3  *
   4  * Copyright (C) 2005 Jens Axboe <axboe@suse.de>
   5  * Copyright (C) 2006-2012 Jens Axboe <axboe@kernel.dk>
   6  *
   7  * The license below covers all files distributed with fio unless otherwise
   8  * noted in the file itself.
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License version 2 as
  12  *  published by the Free Software Foundation.
  13  *
  14  *  This program is distributed in the hope that it will be useful,
  15  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *  GNU General Public License for more details.
  18  *
  19  *  You should have received a copy of the GNU General Public License
  20  *  along with this program; if not, write to the Free Software
  21  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  *
  23  */
  24 #include <unistd.h>
  25 #include <string.h>
  26 #include <signal.h>
  27 #include <assert.h>
  28 #include <inttypes.h>
  29 #include <sys/stat.h>
  30 #include <sys/wait.h>
  31 #include <math.h>
  32
  33 #include "fio.h"
  34 #include "smalloc.h"
  35 #include "verify.h"
  36 #include "diskutil.h"
  37 #include "cgroup.h"
  38 #include "profile.h"
  39 #include "lib/rand.h"
  40 #include "lib/memalign.h"
  41 #include "server.h"
  42 #include "lib/getrusage.h"
  43 #include "idletime.h"
  44 #include "err.h"
  45 #include "workqueue.h"
  46 #include "lib/mountcheck.h"
  47 #include "rate-submit.h"
  48 #include "helper_thread.h"
  49 #include "pshared.h"
  50
  51 static struct fio_sem *startup_sem;
  52 static struct flist_head *cgroup_list;
  53 static char *cgroup_mnt;
  54 static int exit_value;
  55 static volatile int fio_abort;
  56 static unsigned int nr_process = 0;
  57 static unsigned int nr_thread = 0;
  58
  59 struct io_log *agg_io_log[DDIR_RWDIR_CNT];
  60
  61 int groupid = 0;
  62 unsigned int thread_number = 0;
  63 unsigned int stat_number = 0;
  64 int shm_id = 0;
  65 int temp_stall_ts;
  66 unsigned long done_secs = 0;
  67
  68 #define JOB_START_TIMEOUT       (5 * 1000)
  69
  70 static void sig_int(int sig)
  71 {
  72         if (threads) {
  73                 if (is_backend)
  74                         fio_server_got_signal(sig);
  75                 else {
  76                         log_info("\nfio: terminating on signal %d\n", sig);
  77                         log_info_flush();
  78                         exit_value = 128;
  79                 }
  80
  81                 fio_terminate_threads(TERMINATE_ALL);
  82         }
  83 }
  84
  85 void sig_show_status(int sig)
  86 {
  87         show_running_run_stats();
  88 }
  89
  90 static void set_sig_handlers(void)
  91 {
  92         struct sigaction act;
  93
  94         memset(&act, 0, sizeof(act));
  95         act.sa_handler = sig_int;
  96         act.sa_flags = SA_RESTART;
  97         sigaction(SIGINT, &act, NULL);
  98
  99         memset(&act, 0, sizeof(act));
 100         act.sa_handler = sig_int;
 101         act.sa_flags = SA_RESTART;
 102         sigaction(SIGTERM, &act, NULL);
 103
 104 /* Windows uses SIGBREAK as a quit signal from other applications */
 105 #ifdef WIN32
 106         memset(&act, 0, sizeof(act));
 107         act.sa_handler = sig_int;
 108         act.sa_flags = SA_RESTART;
 109         sigaction(SIGBREAK, &act, NULL);
 110 #endif
 111
 112         memset(&act, 0, sizeof(act));
 113         act.sa_handler = sig_show_status;
 114         act.sa_flags = SA_RESTART;
 115         sigaction(SIGUSR1, &act, NULL);
 116
 117         if (is_backend) {
 118                 memset(&act, 0, sizeof(act));
 119                 act.sa_handler = sig_int;
 120                 act.sa_flags = SA_RESTART;
 121                 sigaction(SIGPIPE, &act, NULL);
 122         }
 123 }
 124
 125 /*
 126  * Check if we are above the minimum rate given.
 127  */
 128 static bool __check_min_rate(struct thread_data *td, struct timespec *now,
 129                              enum fio_ddir ddir)
 130 {
 131         unsigned long long bytes = 0;
 132         unsigned long iops = 0;
 133         unsigned long spent;
 134         unsigned long rate;
 135         unsigned int ratemin = 0;
 136         unsigned int rate_iops = 0;
 137         unsigned int rate_iops_min = 0;
 138
 139         assert(ddir_rw(ddir));
 140
 141         if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
 142                 return false;
 143
 144         /*
 145          * allow a 2 second settle period in the beginning
 146          */
 147         if (mtime_since(&td->start, now) < 2000)
 148                 return false;
 149
 150         iops += td->this_io_blocks[ddir];
 151         bytes += td->this_io_bytes[ddir];
 152         ratemin += td->o.ratemin[ddir];
 153         rate_iops += td->o.rate_iops[ddir];
 154         rate_iops_min += td->o.rate_iops_min[ddir];
 155
 156         /*
 157          * if rate blocks is set, sample is running
 158          */
 159         if (td->rate_bytes[ddir] || td->rate_blocks[ddir]) {
 160                 spent = mtime_since(&td->lastrate[ddir], now);
 161                 if (spent < td->o.ratecycle)
 162                         return false;
 163
 164                 if (td->o.rate[ddir] || td->o.ratemin[ddir]) {
 165                         /*
 166                          * check bandwidth specified rate
 167                          */
 168                         if (bytes < td->rate_bytes[ddir]) {
 169                                 log_err("%s: rate_min=%uB/s not met, only transferred %lluB\n",
 170                                         td->o.name, ratemin, bytes);
 171                                 return true;
 172                         } else {
 173                                 if (spent)
 174                                         rate = ((bytes - td->rate_bytes[ddir]) * 1000) / spent;
 175                                 else
 176                                         rate = 0;
 177
 178                                 if (rate < ratemin ||
 179                                     bytes < td->rate_bytes[ddir]) {
 180                                         log_err("%s: rate_min=%uB/s not met, got %luB/s\n",
 181                                                 td->o.name, ratemin, rate);
 182                                         return true;
 183                                 }
 184                         }
 185                 } else {
 186                         /*
 187                          * checks iops specified rate
 188                          */
 189                         if (iops < rate_iops) {
 190                                 log_err("%s: rate_iops_min=%u not met, only performed %lu IOs\n",
 191                                                 td->o.name, rate_iops, iops);
 192                                 return true;
 193                         } else {
 194                                 if (spent)
 195                                         rate = ((iops - td->rate_blocks[ddir]) * 1000) / spent;
 196                                 else
 197                                         rate = 0;
 198
 199                                 if (rate < rate_iops_min ||
 200                                     iops < td->rate_blocks[ddir]) {
 201                                         log_err("%s: rate_iops_min=%u not met, got %lu IOPS\n",
 202                                                 td->o.name, rate_iops_min, rate);
 203                                         return true;
 204                                 }
 205                         }
 206                 }
 207         }
 208
 209         td->rate_bytes[ddir] = bytes;
 210         td->rate_blocks[ddir] = iops;
 211         memcpy(&td->lastrate[ddir], now, sizeof(*now));
 212         return false;
 213 }
 214
 215 static bool check_min_rate(struct thread_data *td, struct timespec *now)
 216 {
 217         bool ret = false;
 218
 219         if (td->bytes_done[DDIR_READ])
 220                 ret |= __check_min_rate(td, now, DDIR_READ);
 221         if (td->bytes_done[DDIR_WRITE])
 222                 ret |= __check_min_rate(td, now, DDIR_WRITE);
 223         if (td->bytes_done[DDIR_TRIM])
 224                 ret |= __check_min_rate(td, now, DDIR_TRIM);
 225
 226         return ret;
 227 }
 228
 229 /*
 230  * When job exits, we can cancel the in-flight IO if we are using async
 231  * io. Attempt to do so.
 232  */
 233 static void cleanup_pending_aio(struct thread_data *td)
 234 {
 235         int r;
 236
 237         /*
 238          * get immediately available events, if any
 239          */
 240         r = io_u_queued_complete(td, 0);
 241         if (r < 0)
 242                 return;
 243
 244         /*
 245          * now cancel remaining active events
 246          */
 247         if (td->io_ops->cancel) {
 248                 struct io_u *io_u;
 249                 int i;
 250
 251                 io_u_qiter(&td->io_u_all, io_u, i) {
 252                         if (io_u->flags & IO_U_F_FLIGHT) {
 253                                 r = td->io_ops->cancel(td, io_u);
 254                                 if (!r)
 255                                         put_io_u(td, io_u);
 256                         }
 257                 }
 258         }
 259
 260         if (td->cur_depth)
 261                 r = io_u_queued_complete(td, td->cur_depth);
 262 }
 263
 264 /*
 265  * Helper to handle the final sync of a file. Works just like the normal
 266  * io path, just does everything sync.
 267  */
 268 static bool fio_io_sync(struct thread_data *td, struct fio_file *f)
 269 {
 270         struct io_u *io_u = __get_io_u(td);
 271         int ret;
 272
 273         if (!io_u)
 274                 return true;
 275
 276         io_u->ddir = DDIR_SYNC;
 277         io_u->file = f;
 278
 279         if (td_io_prep(td, io_u)) {
 280                 put_io_u(td, io_u);
 281                 return true;
 282         }
 283
 284 requeue:
 285         ret = td_io_queue(td, io_u);
 286         if (ret < 0) {
 287                 td_verror(td, io_u->error, "td_io_queue");
 288                 put_io_u(td, io_u);
 289                 return true;
 290         } else if (ret == FIO_Q_QUEUED) {
 291                 td_io_commit(td);
 292                 if (io_u_queued_complete(td, 1) < 0)
 293                         return true;
 294         } else if (ret == FIO_Q_COMPLETED) {
 295                 if (io_u->error) {
 296                         td_verror(td, io_u->error, "td_io_queue");
 297                         return true;
 298                 }
 299
 300                 if (io_u_sync_complete(td, io_u) < 0)
 301                         return true;
 302         } else if (ret == FIO_Q_BUSY) {
 303                 td_io_commit(td);
 304                 goto requeue;
 305         }
 306
 307         return false;
 308 }
 309
 310 static int fio_file_fsync(struct thread_data *td, struct fio_file *f)
 311 {
 312         int ret;
 313
 314         if (fio_file_open(f))
 315                 return fio_io_sync(td, f);
 316
 317         if (td_io_open_file(td, f))
 318                 return 1;
 319
 320         ret = fio_io_sync(td, f);
 321         td_io_close_file(td, f);
 322         return ret;
 323 }
 324
 325 static inline void __update_ts_cache(struct thread_data *td)
 326 {
 327         fio_gettime(&td->ts_cache, NULL);
 328 }
 329
 330 static inline void update_ts_cache(struct thread_data *td)
 331 {
 332         if ((++td->ts_cache_nr & td->ts_cache_mask) == td->ts_cache_mask)
 333                 __update_ts_cache(td);
 334 }
 335
 336 static inline bool runtime_exceeded(struct thread_data *td, struct timespec *t)
 337 {
 338         if (in_ramp_time(td))
 339                 return false;
 340         if (!td->o.timeout)
 341                 return false;
 342         if (utime_since(&td->epoch, t) >= td->o.timeout)
 343                 return true;
 344
 345         return false;
 346 }
 347
 348 /*
 349  * We need to update the runtime consistently in ms, but keep a running
 350  * tally of the current elapsed time in microseconds for sub millisecond
 351  * updates.
 352  */
 353 static inline void update_runtime(struct thread_data *td,
 354                                   unsigned long long *elapsed_us,
 355                                   const enum fio_ddir ddir)
 356 {
 357         if (ddir == DDIR_WRITE && td_write(td) && td->o.verify_only)
 358                 return;
 359
 360         td->ts.runtime[ddir] -= (elapsed_us[ddir] + 999) / 1000;
 361         elapsed_us[ddir] += utime_since_now(&td->start);
 362         td->ts.runtime[ddir] += (elapsed_us[ddir] + 999) / 1000;
 363 }
 364
 365 static bool break_on_this_error(struct thread_data *td, enum fio_ddir ddir,
 366                                 int *retptr)
 367 {
 368         int ret = *retptr;
 369
 370         if (ret < 0 || td->error) {
 371                 int err = td->error;
 372                 enum error_type_bit eb;
 373
 374                 if (ret < 0)
 375                         err = -ret;
 376
 377                 eb = td_error_type(ddir, err);
 378                 if (!(td->o.continue_on_error & (1 << eb)))
 379                         return true;
 380
 381                 if (td_non_fatal_error(td, eb, err)) {
 382                         /*
 383                          * Continue with the I/Os in case of
 384                          * a non fatal error.
 385                          */
 386                         update_error_count(td, err);
 387                         td_clear_error(td);
 388                         *retptr = 0;
 389                         return false;
 390                 } else if (td->o.fill_device && err == ENOSPC) {
 391                         /*
 392                          * We expect to hit this error if
 393                          * fill_device option is set.
 394                          */
 395                         td_clear_error(td);
 396                         fio_mark_td_terminate(td);
 397                         return true;
 398                 } else {
 399                         /*
 400                          * Stop the I/O in case of a fatal
 401                          * error.
 402                          */
 403                         update_error_count(td, err);
 404                         return true;
 405                 }
 406         }
 407
 408         return false;
 409 }
 410
 411 static void check_update_rusage(struct thread_data *td)
 412 {
 413         if (td->update_rusage) {
 414                 td->update_rusage = 0;
 415                 update_rusage_stat(td);
 416                 fio_sem_up(td->rusage_sem);
 417         }
 418 }
 419
 420 static int wait_for_completions(struct thread_data *td, struct timespec *time)
 421 {
 422         const int full = queue_full(td);
 423         int min_evts = 0;
 424         int ret;
 425
 426         if (td->flags & TD_F_REGROW_LOGS)
 427                 return io_u_quiesce(td);
 428
 429         /*
 430          * if the queue is full, we MUST reap at least 1 event
 431          */
 432         min_evts = min(td->o.iodepth_batch_complete_min, td->cur_depth);
 433         if ((full && !min_evts) || !td->o.iodepth_batch_complete_min)
 434                 min_evts = 1;
 435
 436         if (time && (__should_check_rate(td, DDIR_READ) ||
 437             __should_check_rate(td, DDIR_WRITE) ||
 438             __should_check_rate(td, DDIR_TRIM)))
 439                 fio_gettime(time, NULL);
 440
 441         do {
 442                 ret = io_u_queued_complete(td, min_evts);
 443                 if (ret < 0)
 444                         break;
 445         } while (full && (td->cur_depth > td->o.iodepth_low));
 446
 447         return ret;
 448 }
 449
 450 int io_queue_event(struct thread_data *td, struct io_u *io_u, int *ret,
 451                    enum fio_ddir ddir, uint64_t *bytes_issued, int from_verify,
 452                    struct timespec *comp_time)
 453 {
 454         switch (*ret) {
 455         case FIO_Q_COMPLETED:
 456                 if (io_u->error) {
 457                         *ret = -io_u->error;
 458                         clear_io_u(td, io_u);
 459                 } else if (io_u->resid) {
 460                         int bytes = io_u->xfer_buflen - io_u->resid;
 461                         struct fio_file *f = io_u->file;
 462
 463                         if (bytes_issued)
 464                                 *bytes_issued += bytes;
 465
 466                         if (!from_verify)
 467                                 trim_io_piece(td, io_u);
 468
 469                         /*
 470                          * zero read, fail
 471                          */
 472                         if (!bytes) {
 473                                 if (!from_verify)
 474                                         unlog_io_piece(td, io_u);
 475                                 td_verror(td, EIO, "full resid");
 476                                 put_io_u(td, io_u);
 477                                 break;
 478                         }
 479
 480                         io_u->xfer_buflen = io_u->resid;
 481                         io_u->xfer_buf += bytes;
 482                         io_u->offset += bytes;
 483
 484                         if (ddir_rw(io_u->ddir))
 485                                 td->ts.short_io_u[io_u->ddir]++;
 486
 487                         if (io_u->offset == f->real_file_size)
 488                                 goto sync_done;
 489
 490                         requeue_io_u(td, &io_u);
 491                 } else {
 492 sync_done:
 493                         if (comp_time && (__should_check_rate(td, DDIR_READ) ||
 494                             __should_check_rate(td, DDIR_WRITE) ||
 495                             __should_check_rate(td, DDIR_TRIM)))
 496                                 fio_gettime(comp_time, NULL);
 497
 498                         *ret = io_u_sync_complete(td, io_u);
 499                         if (*ret < 0)
 500                                 break;
 501                 }
 502
 503                 if (td->flags & TD_F_REGROW_LOGS)
 504                         regrow_logs(td);
 505
 506                 /*
 507                  * when doing I/O (not when verifying),
 508                  * check for any errors that are to be ignored
 509                  */
 510                 if (!from_verify)
 511                         break;
 512
 513                 return 0;
 514         case FIO_Q_QUEUED:
 515                 /*
 516                  * if the engine doesn't have a commit hook,
 517                  * the io_u is really queued. if it does have such
 518                  * a hook, it has to call io_u_queued() itself.
 519                  */
 520                 if (td->io_ops->commit == NULL)
 521                         io_u_queued(td, io_u);
 522                 if (bytes_issued)
 523                         *bytes_issued += io_u->xfer_buflen;
 524                 break;
 525         case FIO_Q_BUSY:
 526                 if (!from_verify)
 527                         unlog_io_piece(td, io_u);
 528                 requeue_io_u(td, &io_u);
 529                 td_io_commit(td);
 530                 break;
 531         default:
 532                 assert(*ret < 0);
 533                 td_verror(td, -(*ret), "td_io_queue");
 534                 break;
 535         }
 536
 537         if (break_on_this_error(td, ddir, ret))
 538                 return 1;
 539
 540         return 0;
 541 }
 542
 543 static inline bool io_in_polling(struct thread_data *td)
 544 {
 545         return !td->o.iodepth_batch_complete_min &&
 546                    !td->o.iodepth_batch_complete_max;
 547 }
 548 /*
 549  * Unlinks files from thread data fio_file structure
 550  */
 551 static int unlink_all_files(struct thread_data *td)
 552 {
 553         struct fio_file *f;
 554         unsigned int i;
 555         int ret = 0;
 556
 557         for_each_file(td, f, i) {
 558                 if (f->filetype != FIO_TYPE_FILE)
 559                         continue;
 560                 ret = td_io_unlink_file(td, f);
 561                 if (ret)
 562                         break;
 563         }
 564
 565         if (ret)
 566                 td_verror(td, ret, "unlink_all_files");
 567
 568         return ret;
 569 }
 570
 571 /*
 572  * Check if io_u will overlap an in-flight IO in the queue
 573  */
 574 static bool in_flight_overlap(struct io_u_queue *q, struct io_u *io_u)
 575 {
 576         bool overlap;
 577         struct io_u *check_io_u;
 578         unsigned long long x1, x2, y1, y2;
 579         int i;
 580
 581         x1 = io_u->offset;
 582         x2 = io_u->offset + io_u->buflen;
 583         overlap = false;
 584         io_u_qiter(q, check_io_u, i) {
 585                 if (check_io_u->flags & IO_U_F_FLIGHT) {
 586                         y1 = check_io_u->offset;
 587                         y2 = check_io_u->offset + check_io_u->buflen;
 588
 589                         if (x1 < y2 && y1 < x2) {
 590                                 overlap = true;
 591                                 dprint(FD_IO, "in-flight overlap: %llu/%lu, %llu/%lu\n",
 592                                                 x1, io_u->buflen,
 593                                                 y1, check_io_u->buflen);
 594                                 break;
 595                         }
 596                 }
 597         }
 598
 599         return overlap;
 600 }
 601
 602 static int io_u_submit(struct thread_data *td, struct io_u *io_u)
 603 {
 604         /*
 605          * Check for overlap if the user asked us to, and we have
 606          * at least one IO in flight besides this one.
 607          */
 608         if (td->o.serialize_overlap && td->cur_depth > 1 &&
 609             in_flight_overlap(&td->io_u_all, io_u))
 610                 return FIO_Q_BUSY;
 611
 612         return td_io_queue(td, io_u);
 613 }
 614
 615 /*
 616  * The main verify engine. Runs over the writes we previously submitted,
 617  * reads the blocks back in, and checks the crc/md5 of the data.
 618  */
 619 static void do_verify(struct thread_data *td, uint64_t verify_bytes)
 620 {
 621         struct fio_file *f;
 622         struct io_u *io_u;
 623         int ret, min_events;
 624         unsigned int i;
 625
 626         dprint(FD_VERIFY, "starting loop\n");
 627
 628         /*
 629          * sync io first and invalidate cache, to make sure we really
 630          * read from disk.
 631          */
 632         for_each_file(td, f, i) {
 633                 if (!fio_file_open(f))
 634                         continue;
 635                 if (fio_io_sync(td, f))
 636                         break;
 637                 if (file_invalidate_cache(td, f))
 638                         break;
 639         }
 640
 641         check_update_rusage(td);
 642
 643         if (td->error)
 644                 return;
 645
 646         /*
 647          * verify_state needs to be reset before verification
 648          * proceeds so that expected random seeds match actual
 649          * random seeds in headers. The main loop will reset
 650          * all random number generators if randrepeat is set.
 651          */
 652         if (!td->o.rand_repeatable)
 653                 td_fill_verify_state_seed(td);
 654
 655         td_set_runstate(td, TD_VERIFYING);
 656
 657         io_u = NULL;
 658         while (!td->terminate) {
 659                 enum fio_ddir ddir;
 660                 int full;
 661
 662                 update_ts_cache(td);
 663                 check_update_rusage(td);
 664
 665                 if (runtime_exceeded(td, &td->ts_cache)) {
 666                         __update_ts_cache(td);
 667                         if (runtime_exceeded(td, &td->ts_cache)) {
 668                                 fio_mark_td_terminate(td);
 669                                 break;
 670                         }
 671                 }
 672
 673                 if (flow_threshold_exceeded(td))
 674                         continue;
 675
 676                 if (!td->o.experimental_verify) {
 677                         io_u = __get_io_u(td);
 678                         if (!io_u)
 679                                 break;
 680
 681                         if (get_next_verify(td, io_u)) {
 682                                 put_io_u(td, io_u);
 683                                 break;
 684                         }
 685
 686                         if (td_io_prep(td, io_u)) {
 687                                 put_io_u(td, io_u);
 688                                 break;
 689                         }
 690                 } else {
 691                         if (ddir_rw_sum(td->bytes_done) + td->o.rw_min_bs > verify_bytes)
 692                                 break;
 693
 694                         while ((io_u = get_io_u(td)) != NULL) {
 695                                 if (IS_ERR_OR_NULL(io_u)) {
 696                                         io_u = NULL;
 697                                         ret = FIO_Q_BUSY;
 698                                         goto reap;
 699                                 }
 700
 701                                 /*
 702                                  * We are only interested in the places where
 703                                  * we wrote or trimmed IOs. Turn those into
 704                                  * reads for verification purposes.
 705                                  */
 706                                 if (io_u->ddir == DDIR_READ) {
 707                                         /*
 708                                          * Pretend we issued it for rwmix
 709                                          * accounting
 710                                          */
 711                                         td->io_issues[DDIR_READ]++;
 712                                         put_io_u(td, io_u);
 713                                         continue;
 714                                 } else if (io_u->ddir == DDIR_TRIM) {
 715                                         io_u->ddir = DDIR_READ;
 716                                         io_u_set(td, io_u, IO_U_F_TRIMMED);
 717                                         break;
 718                                 } else if (io_u->ddir == DDIR_WRITE) {
 719                                         io_u->ddir = DDIR_READ;
 720                                         populate_verify_io_u(td, io_u);
 721                                         break;
 722                                 } else {
 723                                         put_io_u(td, io_u);
 724                                         continue;
 725                                 }
 726                         }
 727
 728                         if (!io_u)
 729                                 break;
 730                 }
 731
 732                 if (verify_state_should_stop(td, io_u)) {
 733                         put_io_u(td, io_u);
 734                         break;
 735                 }
 736
 737                 if (td->o.verify_async)
 738                         io_u->end_io = verify_io_u_async;
 739                 else
 740                         io_u->end_io = verify_io_u;
 741
 742                 ddir = io_u->ddir;
 743                 if (!td->o.disable_slat)
 744                         fio_gettime(&io_u->start_time, NULL);
 745
 746                 ret = io_u_submit(td, io_u);
 747
 748                 if (io_queue_event(td, io_u, &ret, ddir, NULL, 1, NULL))
 749                         break;
 750
 751                 /*
 752                  * if we can queue more, do so. but check if there are
 753                  * completed io_u's first. Note that we can get BUSY even
 754                  * without IO queued, if the system is resource starved.
 755                  */
 756 reap:
 757                 full = queue_full(td) || (ret == FIO_Q_BUSY && td->cur_depth);
 758                 if (full || io_in_polling(td))
 759                         ret = wait_for_completions(td, NULL);
 760
 761                 if (ret < 0)
 762                         break;
 763         }
 764
 765         check_update_rusage(td);
 766
 767         if (!td->error) {
 768                 min_events = td->cur_depth;
 769
 770                 if (min_events)
 771                         ret = io_u_queued_complete(td, min_events);
 772         } else
 773                 cleanup_pending_aio(td);
 774
 775         td_set_runstate(td, TD_RUNNING);
 776
 777         dprint(FD_VERIFY, "exiting loop\n");
 778 }
 779
 780 static bool exceeds_number_ios(struct thread_data *td)
 781 {
 782         unsigned long long number_ios;
 783
 784         if (!td->o.number_ios)
 785                 return false;
 786
 787         number_ios = ddir_rw_sum(td->io_blocks);
 788         number_ios += td->io_u_queued + td->io_u_in_flight;
 789
 790         return number_ios >= (td->o.number_ios * td->loops);
 791 }
 792
 793 static bool io_bytes_exceeded(struct thread_data *td, uint64_t *this_bytes)
 794 {
 795         unsigned long long bytes, limit;
 796
 797         if (td_rw(td))
 798                 bytes = this_bytes[DDIR_READ] + this_bytes[DDIR_WRITE];
 799         else if (td_write(td))
 800                 bytes = this_bytes[DDIR_WRITE];
 801         else if (td_read(td))
 802                 bytes = this_bytes[DDIR_READ];
 803         else
 804                 bytes = this_bytes[DDIR_TRIM];
 805
 806         if (td->o.io_size)
 807                 limit = td->o.io_size;
 808         else
 809                 limit = td->o.size;
 810
 811         limit *= td->loops;
 812         return bytes >= limit || exceeds_number_ios(td);
 813 }
 814
 815 static bool io_issue_bytes_exceeded(struct thread_data *td)
 816 {
 817         return io_bytes_exceeded(td, td->io_issue_bytes);
 818 }
 819
 820 static bool io_complete_bytes_exceeded(struct thread_data *td)
 821 {
 822         return io_bytes_exceeded(td, td->this_io_bytes);
 823 }
 824
 825 /*
 826  * used to calculate the next io time for rate control
 827  *
 828  */
 829 static long long usec_for_io(struct thread_data *td, enum fio_ddir ddir)
 830 {
 831         uint64_t bps = td->rate_bps[ddir];
 832
 833         assert(!(td->flags & TD_F_CHILD));
 834
 835         if (td->o.rate_process == RATE_PROCESS_POISSON) {
 836                 uint64_t val, iops;
 837
 838                 iops = bps / td->o.bs[ddir];
 839                 val = (int64_t) (1000000 / iops) *
 840                                 -logf(__rand_0_1(&td->poisson_state[ddir]));
 841                 if (val) {
 842                         dprint(FD_RATE, "poisson rate iops=%llu, ddir=%d\n",
 843                                         (unsigned long long) 1000000 / val,
 844                                         ddir);
 845                 }
 846                 td->last_usec[ddir] += val;
 847                 return td->last_usec[ddir];
 848         } else if (bps) {
 849                 uint64_t bytes = td->rate_io_issue_bytes[ddir];
 850                 uint64_t secs = bytes / bps;
 851                 uint64_t remainder = bytes % bps;
 852
 853                 return remainder * 1000000 / bps + secs * 1000000;
 854         }
 855
 856         return 0;
 857 }
 858
 859 static void handle_thinktime(struct thread_data *td, enum fio_ddir ddir)
 860 {
 861         unsigned long long b;
 862         uint64_t total;
 863         int left;
 864
 865         b = ddir_rw_sum(td->io_blocks);
 866         if (b % td->o.thinktime_blocks)
 867                 return;
 868
 869         io_u_quiesce(td);
 870
 871         total = 0;
 872         if (td->o.thinktime_spin)
 873                 total = usec_spin(td->o.thinktime_spin);
 874
 875         left = td->o.thinktime - total;
 876         if (left)
 877                 total += usec_sleep(td, left);
 878
 879         /*
 880          * If we're ignoring thinktime for the rate, add the number of bytes
 881          * we would have done while sleeping, minus one block to ensure we
 882          * start issuing immediately after the sleep.
 883          */
 884         if (total && td->rate_bps[ddir] && td->o.rate_ign_think) {
 885                 uint64_t missed = (td->rate_bps[ddir] * total) / 1000000ULL;
 886                 uint64_t bs = td->o.min_bs[ddir];
 887                 uint64_t usperop = bs * 1000000ULL / td->rate_bps[ddir];
 888                 uint64_t over;
 889
 890                 if (usperop <= total)
 891                         over = bs;
 892                 else
 893                         over = (usperop - total) / usperop * -bs;
 894
 895                 td->rate_io_issue_bytes[ddir] += (missed - over);
 896         }
 897 }
 898
 899 /*
 900  * Main IO worker function. It retrieves io_u's to process and queues
 901  * and reaps them, checking for rate and errors along the way.
 902  *
 903  * Returns number of bytes written and trimmed.
 904  */
 905 static void do_io(struct thread_data *td, uint64_t *bytes_done)
 906 {
 907         unsigned int i;
 908         int ret = 0;
 909         uint64_t total_bytes, bytes_issued = 0;
 910
 911         for (i = 0; i < DDIR_RWDIR_CNT; i++)
 912                 bytes_done[i] = td->bytes_done[i];
 913
 914         if (in_ramp_time(td))
 915                 td_set_runstate(td, TD_RAMP);
 916         else
 917                 td_set_runstate(td, TD_RUNNING);
 918
 919         lat_target_init(td);
 920
 921         total_bytes = td->o.size;
 922         /*
 923         * Allow random overwrite workloads to write up to io_size
 924         * before starting verification phase as 'size' doesn't apply.
 925         */
 926         if (td_write(td) && td_random(td) && td->o.norandommap)
 927                 total_bytes = max(total_bytes, (uint64_t) td->o.io_size);
 928         /*
 929          * If verify_backlog is enabled, we'll run the verify in this
 930          * handler as well. For that case, we may need up to twice the
 931          * amount of bytes.
 932          */
 933         if (td->o.verify != VERIFY_NONE &&
 934            (td_write(td) && td->o.verify_backlog))
 935                 total_bytes += td->o.size;
 936
 937         /* In trimwrite mode, each byte is trimmed and then written, so
 938          * allow total_bytes to be twice as big */
 939         if (td_trimwrite(td))
 940                 total_bytes += td->total_io_size;
 941
 942         while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
 943                 (!flist_empty(&td->trim_list)) || !io_issue_bytes_exceeded(td) ||
 944                 td->o.time_based) {
 945                 struct timespec comp_time;
 946                 struct io_u *io_u;
 947                 int full;
 948                 enum fio_ddir ddir;
 949
 950                 check_update_rusage(td);
 951
 952                 if (td->terminate || td->done)
 953                         break;
 954
 955                 update_ts_cache(td);
 956
 957                 if (runtime_exceeded(td, &td->ts_cache)) {
 958                         __update_ts_cache(td);
 959                         if (runtime_exceeded(td, &td->ts_cache)) {
 960                                 fio_mark_td_terminate(td);
 961                                 break;
 962                         }
 963                 }
 964
 965                 if (flow_threshold_exceeded(td))
 966                         continue;
 967
 968                 /*
 969                  * Break if we exceeded the bytes. The exception is time
 970                  * based runs, but we still need to break out of the loop
 971                  * for those to run verification, if enabled.
 972                  */
 973                 if (bytes_issued >= total_bytes &&
 974                     (!td->o.time_based ||
 975                      (td->o.time_based && td->o.verify != VERIFY_NONE)))
 976                         break;
 977
 978                 io_u = get_io_u(td);
 979                 if (IS_ERR_OR_NULL(io_u)) {
 980                         int err = PTR_ERR(io_u);
 981
 982                         io_u = NULL;
 983                         ddir = DDIR_INVAL;
 984                         if (err == -EBUSY) {
 985                                 ret = FIO_Q_BUSY;
 986                                 goto reap;
 987                         }
 988                         if (td->o.latency_target)
 989                                 goto reap;
 990                         break;
 991                 }
 992
 993                 if (io_u->ddir == DDIR_WRITE && td->flags & TD_F_DO_VERIFY)
 994                         populate_verify_io_u(td, io_u);
 995
 996                 ddir = io_u->ddir;
 997
 998                 /*
 999                  * Add verification end_io handler if:
1000                  *      - Asked to verify (!td_rw(td))
1001                  *      - Or the io_u is from our verify list (mixed write/ver)
1002                  */
1003                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ &&
1004                     ((io_u->flags & IO_U_F_VER_LIST) || !td_rw(td))) {
1005
1006                         if (!td->o.verify_pattern_bytes) {
1007                                 io_u->rand_seed = __rand(&td->verify_state);
1008                                 if (sizeof(int) != sizeof(long *))
1009                                         io_u->rand_seed *= __rand(&td->verify_state);
1010                         }
1011
1012                         if (verify_state_should_stop(td, io_u)) {
1013                                 put_io_u(td, io_u);
1014                                 break;
1015                         }
1016
1017                         if (td->o.verify_async)
1018                                 io_u->end_io = verify_io_u_async;
1019                         else
1020                                 io_u->end_io = verify_io_u;
1021                         td_set_runstate(td, TD_VERIFYING);
1022                 } else if (in_ramp_time(td))
1023                         td_set_runstate(td, TD_RAMP);
1024                 else
1025                         td_set_runstate(td, TD_RUNNING);
1026
1027                 /*
1028                  * Always log IO before it's issued, so we know the specific
1029                  * order of it. The logged unit will track when the IO has
1030                  * completed.
1031                  */
1032                 if (td_write(td) && io_u->ddir == DDIR_WRITE &&
1033                     td->o.do_verify &&
1034                     td->o.verify != VERIFY_NONE &&
1035                     !td->o.experimental_verify)
1036                         log_io_piece(td, io_u);
1037
1038                 if (td->o.io_submit_mode == IO_MODE_OFFLOAD) {
1039                         const unsigned long blen = io_u->xfer_buflen;
1040                         const enum fio_ddir ddir = acct_ddir(io_u);
1041
1042                         if (td->error)
1043                                 break;
1044
1045                         workqueue_enqueue(&td->io_wq, &io_u->work);
1046                         ret = FIO_Q_QUEUED;
1047
1048                         if (ddir_rw(ddir)) {
1049                                 td->io_issues[ddir]++;
1050                                 td->io_issue_bytes[ddir] += blen;
1051                                 td->rate_io_issue_bytes[ddir] += blen;
1052                         }
1053
1054                         if (should_check_rate(td))
1055                                 td->rate_next_io_time[ddir] = usec_for_io(td, ddir);
1056
1057                 } else {
1058                         ret = io_u_submit(td, io_u);
1059
1060                         if (should_check_rate(td))
1061                                 td->rate_next_io_time[ddir] = usec_for_io(td, ddir);
1062
1063                         if (io_queue_event(td, io_u, &ret, ddir, &bytes_issued, 0, &comp_time))
1064                                 break;
1065
1066                         /*
1067                          * See if we need to complete some commands. Note that
1068                          * we can get BUSY even without IO queued, if the
1069                          * system is resource starved.
1070                          */
1071 reap:
1072                         full = queue_full(td) ||
1073                                 (ret == FIO_Q_BUSY && td->cur_depth);
1074                         if (full || io_in_polling(td))
1075                                 ret = wait_for_completions(td, &comp_time);
1076                 }
1077                 if (ret < 0)
1078                         break;
1079                 if (!ddir_rw_sum(td->bytes_done) &&
1080                     !td_ioengine_flagged(td, FIO_NOIO))
1081                         continue;
1082
1083                 if (!in_ramp_time(td) && should_check_rate(td)) {
1084                         if (check_min_rate(td, &comp_time)) {
1085                                 if (exitall_on_terminate || td->o.exitall_error)
1086                                         fio_terminate_threads(td->groupid);
1087                                 td_verror(td, EIO, "check_min_rate");
1088                                 break;
1089                         }
1090                 }
1091                 if (!in_ramp_time(td) && td->o.latency_target)
1092                         lat_target_check(td);
1093
1094                 if (ddir_rw(ddir) && td->o.thinktime)
1095                         handle_thinktime(td, ddir);
1096         }
1097
1098         check_update_rusage(td);
1099
1100         if (td->trim_entries)
1101                 log_err("fio: %lu trim entries leaked?\n", td->trim_entries);
1102
1103         if (td->o.fill_device && td->error == ENOSPC) {
1104                 td->error = 0;
1105                 fio_mark_td_terminate(td);
1106         }
1107         if (!td->error) {
1108                 struct fio_file *f;
1109
1110                 if (td->o.io_submit_mode == IO_MODE_OFFLOAD) {
1111                         workqueue_flush(&td->io_wq);
1112                         i = 0;
1113                 } else
1114                         i = td->cur_depth;
1115
1116                 if (i) {
1117                         ret = io_u_queued_complete(td, i);
1118                         if (td->o.fill_device && td->error == ENOSPC)
1119                                 td->error = 0;
1120                 }
1121
1122                 if (should_fsync(td) && td->o.end_fsync) {
1123                         td_set_runstate(td, TD_FSYNCING);
1124
1125                         for_each_file(td, f, i) {
1126                                 if (!fio_file_fsync(td, f))
1127                                         continue;
1128
1129                                 log_err("fio: end_fsync failed for file %s\n",
1130                                                                 f->file_name);
1131                         }
1132                 }
1133         } else
1134                 cleanup_pending_aio(td);
1135
1136         /*
1137          * stop job if we failed doing any IO
1138          */
1139         if (!ddir_rw_sum(td->this_io_bytes))
1140                 td->done = 1;
1141
1142         for (i = 0; i < DDIR_RWDIR_CNT; i++)
1143                 bytes_done[i] = td->bytes_done[i] - bytes_done[i];
1144 }
1145
1146 static void free_file_completion_logging(struct thread_data *td)
1147 {
1148         struct fio_file *f;
1149         unsigned int i;
1150
1151         for_each_file(td, f, i) {
1152                 if (!f->last_write_comp)
1153                         break;
1154                 sfree(f->last_write_comp);
1155         }
1156 }
1157
1158 static int init_file_completion_logging(struct thread_data *td,
1159                                         unsigned int depth)
1160 {
1161         struct fio_file *f;
1162         unsigned int i;
1163
1164         if (td->o.verify == VERIFY_NONE || !td->o.verify_state_save)
1165                 return 0;
1166
1167         for_each_file(td, f, i) {
1168                 f->last_write_comp = scalloc(depth, sizeof(uint64_t));
1169                 if (!f->last_write_comp)
1170                         goto cleanup;
1171         }
1172
1173         return 0;
1174
1175 cleanup:
1176         free_file_completion_logging(td);
1177         log_err("fio: failed to alloc write comp data\n");
1178         return 1;
1179 }
1180
1181 static void cleanup_io_u(struct thread_data *td)
1182 {
1183         struct io_u *io_u;
1184
1185         while ((io_u = io_u_qpop(&td->io_u_freelist)) != NULL) {
1186
1187                 if (td->io_ops->io_u_free)
1188                         td->io_ops->io_u_free(td, io_u);
1189
1190                 fio_memfree(io_u, sizeof(*io_u));
1191         }
1192
1193         free_io_mem(td);
1194
1195         io_u_rexit(&td->io_u_requeues);
1196         io_u_qexit(&td->io_u_freelist);
1197         io_u_qexit(&td->io_u_all);
1198
1199         free_file_completion_logging(td);
1200 }
1201
1202 static int init_io_u(struct thread_data *td)
1203 {
1204         struct io_u *io_u;
1205         unsigned int max_bs, min_write;
1206         int cl_align, i, max_units;
1207         int data_xfer = 1, err;
1208         char *p;
1209
1210         max_units = td->o.iodepth;
1211         max_bs = td_max_bs(td);
1212         min_write = td->o.min_bs[DDIR_WRITE];
1213         td->orig_buffer_size = (unsigned long long) max_bs
1214                                         * (unsigned long long) max_units;
1215
1216         if (td_ioengine_flagged(td, FIO_NOIO) || !(td_read(td) || td_write(td)))
1217                 data_xfer = 0;
1218
1219         err = 0;
1220         err += !io_u_rinit(&td->io_u_requeues, td->o.iodepth);
1221         err += !io_u_qinit(&td->io_u_freelist, td->o.iodepth);
1222         err += !io_u_qinit(&td->io_u_all, td->o.iodepth);
1223
1224         if (err) {
1225                 log_err("fio: failed setting up IO queues\n");
1226                 return 1;
1227         }
1228
1229         /*
1230          * if we may later need to do address alignment, then add any
1231          * possible adjustment here so that we don't cause a buffer
1232          * overflow later. this adjustment may be too much if we get
1233          * lucky and the allocator gives us an aligned address.
1234          */
1235         if (td->o.odirect || td->o.mem_align || td->o.oatomic ||
1236             td_ioengine_flagged(td, FIO_RAWIO))
1237                 td->orig_buffer_size += page_mask + td->o.mem_align;
1238
1239         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
1240                 unsigned long bs;
1241
1242                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
1243                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
1244         }
1245
1246         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
1247                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
1248                 return 1;
1249         }
1250
1251         if (data_xfer && allocate_io_mem(td))
1252                 return 1;
1253
1254         if (td->o.odirect || td->o.mem_align || td->o.oatomic ||
1255             td_ioengine_flagged(td, FIO_RAWIO))
1256                 p = PTR_ALIGN(td->orig_buffer, page_mask) + td->o.mem_align;
1257         else
1258                 p = td->orig_buffer;
1259
1260         cl_align = os_cache_line_size();
1261
1262         for (i = 0; i < max_units; i++) {
1263                 void *ptr;
1264
1265                 if (td->terminate)
1266                         return 1;
1267
1268                 ptr = fio_memalign(cl_align, sizeof(*io_u));
1269                 if (!ptr) {
1270                         log_err("fio: unable to allocate aligned memory\n");
1271                         break;
1272                 }
1273
1274                 io_u = ptr;
1275                 memset(io_u, 0, sizeof(*io_u));
1276                 INIT_FLIST_HEAD(&io_u->verify_list);
1277                 dprint(FD_MEM, "io_u alloc %p, index %u\n", io_u, i);
1278
1279                 if (data_xfer) {
1280                         io_u->buf = p;
1281                         dprint(FD_MEM, "io_u %p, mem %p\n", io_u, io_u->buf);
1282
1283                         if (td_write(td))
1284                                 io_u_fill_buffer(td, io_u, min_write, max_bs);
1285                         if (td_write(td) && td->o.verify_pattern_bytes) {
1286                                 /*
1287                                  * Fill the buffer with the pattern if we are
1288                                  * going to be doing writes.
1289                                  */
1290                                 fill_verify_pattern(td, io_u->buf, max_bs, io_u, 0, 0);
1291                         }
1292                 }
1293
1294                 io_u->index = i;
1295                 io_u->flags = IO_U_F_FREE;
1296                 io_u_qpush(&td->io_u_freelist, io_u);
1297
1298                 /*
1299                  * io_u never leaves this stack, used for iteration of all
1300                  * io_u buffers.
1301                  */
1302                 io_u_qpush(&td->io_u_all, io_u);
1303
1304                 if (td->io_ops->io_u_init) {
1305                         int ret = td->io_ops->io_u_init(td, io_u);
1306
1307                         if (ret) {
1308                                 log_err("fio: failed to init engine data: %d\n", ret);
1309                                 return 1;
1310                         }
1311                 }
1312
1313                 p += max_bs;
1314         }
1315
1316         if (init_file_completion_logging(td, max_units))
1317                 return 1;
1318
1319         return 0;
1320 }
1321
1322 /*
1323  * This function is Linux specific.
1324  * FIO_HAVE_IOSCHED_SWITCH enabled currently means it's Linux.
1325  */
1326 static int switch_ioscheduler(struct thread_data *td)
1327 {
1328 #ifdef FIO_HAVE_IOSCHED_SWITCH
1329         char tmp[256], tmp2[128], *p;
1330         FILE *f;
1331         int ret;
1332
1333         if (td_ioengine_flagged(td, FIO_DISKLESSIO))
1334                 return 0;
1335
1336         assert(td->files && td->files[0]);
1337         sprintf(tmp, "%s/queue/scheduler", td->files[0]->du->sysfs_root);
1338
1339         f = fopen(tmp, "r+");
1340         if (!f) {
1341                 if (errno == ENOENT) {
1342                         log_err("fio: os or kernel doesn't support IO scheduler"
1343                                 " switching\n");
1344                         return 0;
1345                 }
1346                 td_verror(td, errno, "fopen iosched");
1347                 return 1;
1348         }
1349
1350         /*
1351          * Set io scheduler.
1352          */
1353         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
1354         if (ferror(f) || ret != 1) {
1355                 td_verror(td, errno, "fwrite");
1356                 fclose(f);
1357                 return 1;
1358         }
1359
1360         rewind(f);
1361
1362         /*
1363          * Read back and check that the selected scheduler is now the default.
1364          */
1365         ret = fread(tmp, 1, sizeof(tmp) - 1, f);
1366         if (ferror(f) || ret < 0) {
1367                 td_verror(td, errno, "fread");
1368                 fclose(f);
1369                 return 1;
1370         }
1371         tmp[ret] = '\0';
1372         /*
1373          * either a list of io schedulers or "none\n" is expected. Strip the
1374          * trailing newline.
1375          */
1376         p = tmp;
1377         strsep(&p, "\n");
1378
1379         /*
1380          * Write to "none" entry doesn't fail, so check the result here.
1381          */
1382         if (!strcmp(tmp, "none")) {
1383                 log_err("fio: io scheduler is not tunable\n");
1384                 fclose(f);
1385                 return 0;
1386         }
1387
1388         sprintf(tmp2, "[%s]", td->o.ioscheduler);
1389         if (!strstr(tmp, tmp2)) {
1390                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
1391                 td_verror(td, EINVAL, "iosched_switch");
1392                 fclose(f);
1393                 return 1;
1394         }
1395
1396         fclose(f);
1397         return 0;
1398 #else
1399         return 0;
1400 #endif
1401 }
1402
1403 static bool keep_running(struct thread_data *td)
1404 {
1405         unsigned long long limit;
1406
1407         if (td->done)
1408                 return false;
1409         if (td->terminate)
1410                 return false;
1411         if (td->o.time_based)
1412                 return true;
1413         if (td->o.loops) {
1414                 td->o.loops--;
1415                 return true;
1416         }
1417         if (exceeds_number_ios(td))
1418                 return false;
1419
1420         if (td->o.io_size)
1421                 limit = td->o.io_size;
1422         else
1423                 limit = td->o.size;
1424
1425         if (limit != -1ULL && ddir_rw_sum(td->io_bytes) < limit) {
1426                 uint64_t diff;
1427
1428                 /*
1429                  * If the difference is less than the maximum IO size, we
1430                  * are done.
1431                  */
1432                 diff = limit - ddir_rw_sum(td->io_bytes);
1433                 if (diff < td_max_bs(td))
1434                         return false;
1435
1436                 if (fio_files_done(td) && !td->o.io_size)
1437                         return false;
1438
1439                 return true;
1440         }
1441
1442         return false;
1443 }
1444
1445 static int exec_string(struct thread_options *o, const char *string, const char *mode)
1446 {
1447         size_t newlen = strlen(string) + strlen(o->name) + strlen(mode) + 9 + 1;
1448         int ret;
1449         char *str;
1450
1451         str = malloc(newlen);
1452         sprintf(str, "%s &> %s.%s.txt", string, o->name, mode);
1453
1454         log_info("%s : Saving output of %s in %s.%s.txt\n",o->name, mode, o->name, mode);
1455         ret = system(str);
1456         if (ret == -1)
1457                 log_err("fio: exec of cmd <%s> failed\n", str);
1458
1459         free(str);
1460         return ret;
1461 }
1462
1463 /*
1464  * Dry run to compute correct state of numberio for verification.
1465  */
1466 static uint64_t do_dry_run(struct thread_data *td)
1467 {
1468         td_set_runstate(td, TD_RUNNING);
1469
1470         while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
1471                 (!flist_empty(&td->trim_list)) || !io_complete_bytes_exceeded(td)) {
1472                 struct io_u *io_u;
1473                 int ret;
1474
1475                 if (td->terminate || td->done)
1476                         break;
1477
1478                 io_u = get_io_u(td);
1479                 if (IS_ERR_OR_NULL(io_u))
1480                         break;
1481
1482                 io_u_set(td, io_u, IO_U_F_FLIGHT);
1483                 io_u->error = 0;
1484                 io_u->resid = 0;
1485                 if (ddir_rw(acct_ddir(io_u)))
1486                         td->io_issues[acct_ddir(io_u)]++;
1487                 if (ddir_rw(io_u->ddir)) {
1488                         io_u_mark_depth(td, 1);
1489                         td->ts.total_io_u[io_u->ddir]++;
1490                 }
1491
1492                 if (td_write(td) && io_u->ddir == DDIR_WRITE &&
1493                     td->o.do_verify &&
1494                     td->o.verify != VERIFY_NONE &&
1495                     !td->o.experimental_verify)
1496                         log_io_piece(td, io_u);
1497
1498                 ret = io_u_sync_complete(td, io_u);
1499                 (void) ret;
1500         }
1501
1502         return td->bytes_done[DDIR_WRITE] + td->bytes_done[DDIR_TRIM];
1503 }
1504
1505 struct fork_data {
1506         struct thread_data *td;
1507         struct sk_out *sk_out;
1508 };
1509
1510 /*
1511  * Entry point for the thread based jobs. The process based jobs end up
1512  * here as well, after a little setup.
1513  */
1514 static void *thread_main(void *data)
1515 {
1516         struct fork_data *fd = data;
1517         unsigned long long elapsed_us[DDIR_RWDIR_CNT] = { 0, };
1518         struct thread_data *td = fd->td;
1519         struct thread_options *o = &td->o;
1520         struct sk_out *sk_out = fd->sk_out;
1521         uint64_t bytes_done[DDIR_RWDIR_CNT];
1522         int deadlock_loop_cnt;
1523         bool clear_state, did_some_io;
1524         int ret;
1525
1526         sk_out_assign(sk_out);
1527         free(fd);
1528
1529         if (!o->use_thread) {
1530                 setsid();
1531                 td->pid = getpid();
1532         } else
1533                 td->pid = gettid();
1534
1535         fio_local_clock_init(o->use_thread);
1536
1537         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
1538
1539         if (is_backend)
1540                 fio_server_send_start(td);
1541
1542         INIT_FLIST_HEAD(&td->io_log_list);
1543         INIT_FLIST_HEAD(&td->io_hist_list);
1544         INIT_FLIST_HEAD(&td->verify_list);
1545         INIT_FLIST_HEAD(&td->trim_list);
1546         td->io_hist_tree = RB_ROOT;
1547
1548         ret = mutex_cond_init_pshared(&td->io_u_lock, &td->free_cond);
1549         if (ret) {
1550                 td_verror(td, ret, "mutex_cond_init_pshared");
1551                 goto err;
1552         }
1553         ret = cond_init_pshared(&td->verify_cond);
1554         if (ret) {
1555                 td_verror(td, ret, "mutex_cond_pshared");
1556                 goto err;
1557         }
1558
1559         td_set_runstate(td, TD_INITIALIZED);
1560         dprint(FD_MUTEX, "up startup_sem\n");
1561         fio_sem_up(startup_sem);
1562         dprint(FD_MUTEX, "wait on td->sem\n");
1563         fio_sem_down(td->sem);
1564         dprint(FD_MUTEX, "done waiting on td->sem\n");
1565
1566         /*
1567          * A new gid requires privilege, so we need to do this before setting
1568          * the uid.
1569          */
1570         if (o->gid != -1U && setgid(o->gid)) {
1571                 td_verror(td, errno, "setgid");
1572                 goto err;
1573         }
1574         if (o->uid != -1U && setuid(o->uid)) {
1575                 td_verror(td, errno, "setuid");
1576                 goto err;
1577         }
1578
1579         /*
1580          * Do this early, we don't want the compress threads to be limited
1581          * to the same CPUs as the IO workers. So do this before we set
1582          * any potential CPU affinity
1583          */
1584         if (iolog_compress_init(td, sk_out))
1585                 goto err;
1586
1587         /*
1588          * If we have a gettimeofday() thread, make sure we exclude that
1589          * thread from this job
1590          */
1591         if (o->gtod_cpu)
1592                 fio_cpu_clear(&o->cpumask, o->gtod_cpu);
1593
1594         /*
1595          * Set affinity first, in case it has an impact on the memory
1596          * allocations.
1597          */
1598         if (fio_option_is_set(o, cpumask)) {
1599                 if (o->cpus_allowed_policy == FIO_CPUS_SPLIT) {
1600                         ret = fio_cpus_split(&o->cpumask, td->thread_number - 1);
1601                         if (!ret) {
1602                                 log_err("fio: no CPUs set\n");
1603                                 log_err("fio: Try increasing number of available CPUs\n");
1604                                 td_verror(td, EINVAL, "cpus_split");
1605                                 goto err;
1606                         }
1607                 }
1608                 ret = fio_setaffinity(td->pid, o->cpumask);
1609                 if (ret == -1) {
1610                         td_verror(td, errno, "cpu_set_affinity");
1611                         goto err;
1612                 }
1613         }
1614
1615 #ifdef CONFIG_LIBNUMA
1616         /* numa node setup */
1617         if (fio_option_is_set(o, numa_cpunodes) ||
1618             fio_option_is_set(o, numa_memnodes)) {
1619                 struct bitmask *mask;
1620
1621                 if (numa_available() < 0) {
1622                         td_verror(td, errno, "Does not support NUMA API\n");
1623                         goto err;
1624                 }
1625
1626                 if (fio_option_is_set(o, numa_cpunodes)) {
1627                         mask = numa_parse_nodestring(o->numa_cpunodes);
1628                         ret = numa_run_on_node_mask(mask);
1629                         numa_free_nodemask(mask);
1630                         if (ret == -1) {
1631                                 td_verror(td, errno, \
1632                                         "numa_run_on_node_mask failed\n");
1633                                 goto err;
1634                         }
1635                 }
1636
1637                 if (fio_option_is_set(o, numa_memnodes)) {
1638                         mask = NULL;
1639                         if (o->numa_memnodes)
1640                                 mask = numa_parse_nodestring(o->numa_memnodes);
1641
1642                         switch (o->numa_mem_mode) {
1643                         case MPOL_INTERLEAVE:
1644                                 numa_set_interleave_mask(mask);
1645                                 break;
1646                         case MPOL_BIND:
1647                                 numa_set_membind(mask);
1648                                 break;
1649                         case MPOL_LOCAL:
1650                                 numa_set_localalloc();
1651                                 break;
1652                         case MPOL_PREFERRED:
1653                                 numa_set_preferred(o->numa_mem_prefer_node);
1654                                 break;
1655                         case MPOL_DEFAULT:
1656                         default:
1657                                 break;
1658                         }
1659
1660                         if (mask)
1661                                 numa_free_nodemask(mask);
1662
1663                 }
1664         }
1665 #endif
1666
1667         if (fio_pin_memory(td))
1668                 goto err;
1669
1670         /*
1671          * May alter parameters that init_io_u() will use, so we need to
1672          * do this first.
1673          */
1674         if (init_iolog(td))
1675                 goto err;
1676
1677         if (init_io_u(td))
1678                 goto err;
1679
1680         if (o->verify_async && verify_async_init(td))
1681                 goto err;
1682
1683         if (fio_option_is_set(o, ioprio) ||
1684             fio_option_is_set(o, ioprio_class)) {
1685                 ret = ioprio_set(IOPRIO_WHO_PROCESS, 0, o->ioprio_class, o->ioprio);
1686                 if (ret == -1) {
1687                         td_verror(td, errno, "ioprio_set");
1688                         goto err;
1689                 }
1690         }
1691
1692         if (o->cgroup && cgroup_setup(td, cgroup_list, &cgroup_mnt))
1693                 goto err;
1694
1695         errno = 0;
1696         if (nice(o->nice) == -1 && errno != 0) {
1697                 td_verror(td, errno, "nice");
1698                 goto err;
1699         }
1700
1701         if (o->ioscheduler && switch_ioscheduler(td))
1702                 goto err;
1703
1704         if (!o->create_serialize && setup_files(td))
1705                 goto err;
1706
1707         if (td_io_init(td))
1708                 goto err;
1709
1710         if (!init_random_map(td))
1711                 goto err;
1712
1713         if (o->exec_prerun && exec_string(o, o->exec_prerun, (const char *)"prerun"))
1714                 goto err;
1715
1716         if (o->pre_read && !pre_read_files(td))
1717                 goto err;
1718
1719         fio_verify_init(td);
1720
1721         if (rate_submit_init(td, sk_out))
1722                 goto err;
1723
1724         set_epoch_time(td, o->log_unix_epoch);
1725         fio_getrusage(&td->ru_start);
1726         memcpy(&td->bw_sample_time, &td->epoch, sizeof(td->epoch));
1727         memcpy(&td->iops_sample_time, &td->epoch, sizeof(td->epoch));
1728         memcpy(&td->ss.prev_time, &td->epoch, sizeof(td->epoch));
1729
1730         if (o->ratemin[DDIR_READ] || o->ratemin[DDIR_WRITE] ||
1731                         o->ratemin[DDIR_TRIM]) {
1732                 memcpy(&td->lastrate[DDIR_READ], &td->bw_sample_time,
1733                                         sizeof(td->bw_sample_time));
1734                 memcpy(&td->lastrate[DDIR_WRITE], &td->bw_sample_time,
1735                                         sizeof(td->bw_sample_time));
1736                 memcpy(&td->lastrate[DDIR_TRIM], &td->bw_sample_time,
1737                                         sizeof(td->bw_sample_time));
1738         }
1739
1740         memset(bytes_done, 0, sizeof(bytes_done));
1741         clear_state = false;
1742         did_some_io = false;
1743
1744         while (keep_running(td)) {
1745                 uint64_t verify_bytes;
1746
1747                 fio_gettime(&td->start, NULL);
1748                 memcpy(&td->ts_cache, &td->start, sizeof(td->start));
1749
1750                 if (clear_state) {
1751                         clear_io_state(td, 0);
1752
1753                         if (o->unlink_each_loop && unlink_all_files(td))
1754                                 break;
1755                 }
1756
1757                 prune_io_piece_log(td);
1758
1759                 if (td->o.verify_only && td_write(td))
1760                         verify_bytes = do_dry_run(td);
1761                 else {
1762                         do_io(td, bytes_done);
1763
1764                         if (!ddir_rw_sum(bytes_done)) {
1765                                 fio_mark_td_terminate(td);
1766                                 verify_bytes = 0;
1767                         } else {
1768                                 verify_bytes = bytes_done[DDIR_WRITE] +
1769                                                 bytes_done[DDIR_TRIM];
1770                         }
1771                 }
1772
1773                 /*
1774                  * If we took too long to shut down, the main thread could
1775                  * already consider us reaped/exited. If that happens, break
1776                  * out and clean up.
1777                  */
1778                 if (td->runstate >= TD_EXITED)
1779                         break;
1780
1781                 clear_state = true;
1782
1783                 /*
1784                  * Make sure we've successfully updated the rusage stats
1785                  * before waiting on the stat mutex. Otherwise we could have
1786                  * the stat thread holding stat mutex and waiting for
1787                  * the rusage_sem, which would never get upped because
1788                  * this thread is waiting for the stat mutex.
1789                  */
1790                 deadlock_loop_cnt = 0;
1791                 do {
1792                         check_update_rusage(td);
1793                         if (!fio_sem_down_trylock(stat_sem))
1794                                 break;
1795                         usleep(1000);
1796                         if (deadlock_loop_cnt++ > 5000) {
1797                                 log_err("fio seems to be stuck grabbing stat_sem, forcibly exiting\n");
1798                                 td->error = EDEADLK;
1799                                 goto err;
1800                         }
1801                 } while (1);
1802
1803                 if (td_read(td) && td->io_bytes[DDIR_READ])
1804                         update_runtime(td, elapsed_us, DDIR_READ);
1805                 if (td_write(td) && td->io_bytes[DDIR_WRITE])
1806                         update_runtime(td, elapsed_us, DDIR_WRITE);
1807                 if (td_trim(td) && td->io_bytes[DDIR_TRIM])
1808                         update_runtime(td, elapsed_us, DDIR_TRIM);
1809                 fio_gettime(&td->start, NULL);
1810                 fio_sem_up(stat_sem);
1811
1812                 if (td->error || td->terminate)
1813                         break;
1814
1815                 if (!o->do_verify ||
1816                     o->verify == VERIFY_NONE ||
1817                     td_ioengine_flagged(td, FIO_UNIDIR))
1818                         continue;
1819
1820                 if (ddir_rw_sum(bytes_done))
1821                         did_some_io = true;
1822
1823                 clear_io_state(td, 0);
1824
1825                 fio_gettime(&td->start, NULL);
1826
1827                 do_verify(td, verify_bytes);
1828
1829                 /*
1830                  * See comment further up for why this is done here.
1831                  */
1832                 check_update_rusage(td);
1833
1834                 fio_sem_down(stat_sem);
1835                 update_runtime(td, elapsed_us, DDIR_READ);
1836                 fio_gettime(&td->start, NULL);
1837                 fio_sem_up(stat_sem);
1838
1839                 if (td->error || td->terminate)
1840                         break;
1841         }
1842
1843         /*
1844          * If td ended up with no I/O when it should have had,
1845          * then something went wrong unless FIO_NOIO or FIO_DISKLESSIO.
1846          * (Are we not missing other flags that can be ignored ?)
1847          */
1848         if ((td->o.size || td->o.io_size) && !ddir_rw_sum(bytes_done) &&
1849             !did_some_io && !td->o.create_only &&
1850             !(td_ioengine_flagged(td, FIO_NOIO) ||
1851               td_ioengine_flagged(td, FIO_DISKLESSIO)))
1852                 log_err("%s: No I/O performed by %s, "
1853                          "perhaps try --debug=io option for details?\n",
1854                          td->o.name, td->io_ops->name);
1855
1856         td_set_runstate(td, TD_FINISHING);
1857
1858         update_rusage_stat(td);
1859         td->ts.total_run_time = mtime_since_now(&td->epoch);
1860         td->ts.io_bytes[DDIR_READ] = td->io_bytes[DDIR_READ];
1861         td->ts.io_bytes[DDIR_WRITE] = td->io_bytes[DDIR_WRITE];
1862         td->ts.io_bytes[DDIR_TRIM] = td->io_bytes[DDIR_TRIM];
1863
1864         if (td->o.verify_state_save && !(td->flags & TD_F_VSTATE_SAVED) &&
1865             (td->o.verify != VERIFY_NONE && td_write(td)))
1866                 verify_save_state(td->thread_number);
1867
1868         fio_unpin_memory(td);
1869
1870         td_writeout_logs(td, true);
1871
1872         iolog_compress_exit(td);
1873         rate_submit_exit(td);
1874
1875         if (o->exec_postrun)
1876                 exec_string(o, o->exec_postrun, (const char *)"postrun");
1877
1878         if (exitall_on_terminate || (o->exitall_error && td->error))
1879                 fio_terminate_threads(td->groupid);
1880
1881 err:
1882         if (td->error)
1883                 log_info("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1884                                                         td->verror);
1885
1886         if (o->verify_async)
1887                 verify_async_exit(td);
1888
1889         close_and_free_files(td);
1890         cleanup_io_u(td);
1891         close_ioengine(td);
1892         cgroup_shutdown(td, &cgroup_mnt);
1893         verify_free_state(td);
1894
1895         if (td->zone_state_index) {
1896                 int i;
1897
1898                 for (i = 0; i < DDIR_RWDIR_CNT; i++)
1899                         free(td->zone_state_index[i]);
1900                 free(td->zone_state_index);
1901                 td->zone_state_index = NULL;
1902         }
1903
1904         if (fio_option_is_set(o, cpumask)) {
1905                 ret = fio_cpuset_exit(&o->cpumask);
1906                 if (ret)
1907                         td_verror(td, ret, "fio_cpuset_exit");
1908         }
1909
1910         /*
1911          * do this very late, it will log file closing as well
1912          */
1913         if (o->write_iolog_file)
1914                 write_iolog_close(td);
1915
1916         td_set_runstate(td, TD_EXITED);
1917
1918         /*
1919          * Do this last after setting our runstate to exited, so we
1920          * know that the stat thread is signaled.
1921          */
1922         check_update_rusage(td);
1923
1924         sk_out_drop();
1925         return (void *) (uintptr_t) td->error;
1926 }
1927
1928 /*
1929  * Run over the job map and reap the threads that have exited, if any.
1930  */
1931 static void reap_threads(unsigned int *nr_running, uint64_t *t_rate,
1932                          uint64_t *m_rate)
1933 {
1934         struct thread_data *td;
1935         unsigned int cputhreads, realthreads, pending;
1936         int i, status, ret;
1937
1938         /*
1939          * reap exited threads (TD_EXITED -> TD_REAPED)
1940          */
1941         realthreads = pending = cputhreads = 0;
1942         for_each_td(td, i) {
1943                 int flags = 0;
1944
1945                  if (!strcmp(td->o.ioengine, "cpuio"))
1946                         cputhreads++;
1947                 else
1948                         realthreads++;
1949
1950                 if (!td->pid) {
1951                         pending++;
1952                         continue;
1953                 }
1954                 if (td->runstate == TD_REAPED)
1955                         continue;
1956                 if (td->o.use_thread) {
1957                         if (td->runstate == TD_EXITED) {
1958                                 td_set_runstate(td, TD_REAPED);
1959                                 goto reaped;
1960                         }
1961                         continue;
1962                 }
1963
1964                 flags = WNOHANG;
1965                 if (td->runstate == TD_EXITED)
1966                         flags = 0;
1967
1968                 /*
1969                  * check if someone quit or got killed in an unusual way
1970                  */
1971                 ret = waitpid(td->pid, &status, flags);
1972                 if (ret < 0) {
1973                         if (errno == ECHILD) {
1974                                 log_err("fio: pid=%d disappeared %d\n",
1975                                                 (int) td->pid, td->runstate);
1976                                 td->sig = ECHILD;
1977                                 td_set_runstate(td, TD_REAPED);
1978                                 goto reaped;
1979                         }
1980                         perror("waitpid");
1981                 } else if (ret == td->pid) {
1982                         if (WIFSIGNALED(status)) {
1983                                 int sig = WTERMSIG(status);
1984
1985                                 if (sig != SIGTERM && sig != SIGUSR2)
1986                                         log_err("fio: pid=%d, got signal=%d\n",
1987                                                         (int) td->pid, sig);
1988                                 td->sig = sig;
1989                                 td_set_runstate(td, TD_REAPED);
1990                                 goto reaped;
1991                         }
1992                         if (WIFEXITED(status)) {
1993                                 if (WEXITSTATUS(status) && !td->error)
1994                                         td->error = WEXITSTATUS(status);
1995
1996                                 td_set_runstate(td, TD_REAPED);
1997                                 goto reaped;
1998                         }
1999                 }
2000
2001                 /*
2002                  * If the job is stuck, do a forceful timeout of it and
2003                  * move on.
2004                  */
2005                 if (td->terminate &&
2006                     td->runstate < TD_FSYNCING &&
2007                     time_since_now(&td->terminate_time) >= FIO_REAP_TIMEOUT) {
2008                         log_err("fio: job '%s' (state=%d) hasn't exited in "
2009                                 "%lu seconds, it appears to be stuck. Doing "
2010                                 "forceful exit of this job.\n",
2011                                 td->o.name, td->runstate,
2012                                 (unsigned long) time_since_now(&td->terminate_time));
2013                         td_set_runstate(td, TD_REAPED);
2014                         goto reaped;
2015                 }
2016
2017                 /*
2018                  * thread is not dead, continue
2019                  */
2020                 pending++;
2021                 continue;
2022 reaped:
2023                 (*nr_running)--;
2024                 (*m_rate) -= ddir_rw_sum(td->o.ratemin);
2025                 (*t_rate) -= ddir_rw_sum(td->o.rate);
2026                 if (!td->pid)
2027                         pending--;
2028
2029                 if (td->error)
2030                         exit_value++;
2031
2032                 done_secs += mtime_since_now(&td->epoch) / 1000;
2033                 profile_td_exit(td);
2034         }
2035
2036         if (*nr_running == cputhreads && !pending && realthreads)
2037                 fio_terminate_threads(TERMINATE_ALL);
2038 }
2039
2040 static bool __check_trigger_file(void)
2041 {
2042         struct stat sb;
2043
2044         if (!trigger_file)
2045                 return false;
2046
2047         if (stat(trigger_file, &sb))
2048                 return false;
2049
2050         if (unlink(trigger_file) < 0)
2051                 log_err("fio: failed to unlink %s: %s\n", trigger_file,
2052                                                         strerror(errno));
2053
2054         return true;
2055 }
2056
2057 static bool trigger_timedout(void)
2058 {
2059         if (trigger_timeout)
2060                 if (time_since_genesis() >= trigger_timeout) {
2061                         trigger_timeout = 0;
2062                         return true;
2063                 }
2064
2065         return false;
2066 }
2067
2068 void exec_trigger(const char *cmd)
2069 {
2070         int ret;
2071
2072         if (!cmd || cmd[0] == '\0')
2073                 return;
2074
2075         ret = system(cmd);
2076         if (ret == -1)
2077                 log_err("fio: failed executing %s trigger\n", cmd);
2078 }
2079
2080 void check_trigger_file(void)
2081 {
2082         if (__check_trigger_file() || trigger_timedout()) {
2083                 if (nr_clients)
2084                         fio_clients_send_trigger(trigger_remote_cmd);
2085                 else {
2086                         verify_save_state(IO_LIST_ALL);
2087                         fio_terminate_threads(TERMINATE_ALL);
2088                         exec_trigger(trigger_cmd);
2089                 }
2090         }
2091 }
2092
2093 static int fio_verify_load_state(struct thread_data *td)
2094 {
2095         int ret;
2096
2097         if (!td->o.verify_state)
2098                 return 0;
2099
2100         if (is_backend) {
2101                 void *data;
2102
2103                 ret = fio_server_get_verify_state(td->o.name,
2104                                         td->thread_number - 1, &data);
2105                 if (!ret)
2106                         verify_assign_state(td, data);
2107         } else
2108                 ret = verify_load_state(td, "local");
2109
2110         return ret;
2111 }
2112
2113 static void do_usleep(unsigned int usecs)
2114 {
2115         check_for_running_stats();
2116         check_trigger_file();
2117         usleep(usecs);
2118 }
2119
2120 static bool check_mount_writes(struct thread_data *td)
2121 {
2122         struct fio_file *f;
2123         unsigned int i;
2124
2125         if (!td_write(td) || td->o.allow_mounted_write)
2126                 return false;
2127
2128         /*
2129          * If FIO_HAVE_CHARDEV_SIZE is defined, it's likely that chrdevs
2130          * are mkfs'd and mounted.
2131          */
2132         for_each_file(td, f, i) {
2133 #ifdef FIO_HAVE_CHARDEV_SIZE
2134                 if (f->filetype != FIO_TYPE_BLOCK && f->filetype != FIO_TYPE_CHAR)
2135 #else
2136                 if (f->filetype != FIO_TYPE_BLOCK)
2137 #endif
2138                         continue;
2139                 if (device_is_mounted(f->file_name))
2140                         goto mounted;
2141         }
2142
2143         return false;
2144 mounted:
2145         log_err("fio: %s appears mounted, and 'allow_mounted_write' isn't set. Aborting.\n", f->file_name);
2146         return true;
2147 }
2148
2149 static bool waitee_running(struct thread_data *me)
2150 {
2151         const char *waitee = me->o.wait_for;
2152         const char *self = me->o.name;
2153         struct thread_data *td;
2154         int i;
2155
2156         if (!waitee)
2157                 return false;
2158
2159         for_each_td(td, i) {
2160                 if (!strcmp(td->o.name, self) || strcmp(td->o.name, waitee))
2161                         continue;
2162
2163                 if (td->runstate < TD_EXITED) {
2164                         dprint(FD_PROCESS, "%s fenced by %s(%s)\n",
2165                                         self, td->o.name,
2166                                         runstate_to_name(td->runstate));
2167                         return true;
2168                 }
2169         }
2170
2171         dprint(FD_PROCESS, "%s: %s completed, can run\n", self, waitee);
2172         return false;
2173 }
2174
2175 /*
2176  * Main function for kicking off and reaping jobs, as needed.
2177  */
2178 static void run_threads(struct sk_out *sk_out)
2179 {
2180         struct thread_data *td;
2181         unsigned int i, todo, nr_running, nr_started;
2182         uint64_t m_rate, t_rate;
2183         uint64_t spent;
2184
2185         if (fio_gtod_offload && fio_start_gtod_thread())
2186                 return;
2187
2188         fio_idle_prof_init();
2189
2190         set_sig_handlers();
2191
2192         nr_thread = nr_process = 0;
2193         for_each_td(td, i) {
2194                 if (check_mount_writes(td))
2195                         return;
2196                 if (td->o.use_thread)
2197                         nr_thread++;
2198                 else
2199                         nr_process++;
2200         }
2201
2202         if (output_format & FIO_OUTPUT_NORMAL) {
2203                 log_info("Starting ");
2204                 if (nr_thread)
2205                         log_info("%d thread%s", nr_thread,
2206                                                 nr_thread > 1 ? "s" : "");
2207                 if (nr_process) {
2208                         if (nr_thread)
2209                                 log_info(" and ");
2210                         log_info("%d process%s", nr_process,
2211                                                 nr_process > 1 ? "es" : "");
2212                 }
2213                 log_info("\n");
2214                 log_info_flush();
2215         }
2216
2217         todo = thread_number;
2218         nr_running = 0;
2219         nr_started = 0;
2220         m_rate = t_rate = 0;
2221
2222         for_each_td(td, i) {
2223                 print_status_init(td->thread_number - 1);
2224
2225                 if (!td->o.create_serialize)
2226                         continue;
2227
2228                 if (fio_verify_load_state(td))
2229                         goto reap;
2230
2231                 /*
2232                  * do file setup here so it happens sequentially,
2233                  * we don't want X number of threads getting their
2234                  * client data interspersed on disk
2235                  */
2236                 if (setup_files(td)) {
2237 reap:
2238                         exit_value++;
2239                         if (td->error)
2240                                 log_err("fio: pid=%d, err=%d/%s\n",
2241                                         (int) td->pid, td->error, td->verror);
2242                         td_set_runstate(td, TD_REAPED);
2243                         todo--;
2244                 } else {
2245                         struct fio_file *f;
2246                         unsigned int j;
2247
2248                         /*
2249                          * for sharing to work, each job must always open
2250                          * its own files. so close them, if we opened them
2251                          * for creation
2252                          */
2253                         for_each_file(td, f, j) {
2254                                 if (fio_file_open(f))
2255                                         td_io_close_file(td, f);
2256                         }
2257                 }
2258         }
2259
2260         /* start idle threads before io threads start to run */
2261         fio_idle_prof_start();
2262
2263         set_genesis_time();
2264
2265         while (todo) {
2266                 struct thread_data *map[REAL_MAX_JOBS];
2267                 struct timespec this_start;
2268                 int this_jobs = 0, left;
2269                 struct fork_data *fd;
2270
2271                 /*
2272                  * create threads (TD_NOT_CREATED -> TD_CREATED)
2273                  */
2274                 for_each_td(td, i) {
2275                         if (td->runstate != TD_NOT_CREATED)
2276                                 continue;
2277
2278                         /*
2279                          * never got a chance to start, killed by other
2280                          * thread for some reason
2281                          */
2282                         if (td->terminate) {
2283                                 todo--;
2284                                 continue;
2285                         }
2286
2287                         if (td->o.start_delay) {
2288                                 spent = utime_since_genesis();
2289
2290                                 if (td->o.start_delay > spent)
2291                                         continue;
2292                         }
2293
2294                         if (td->o.stonewall && (nr_started || nr_running)) {
2295                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
2296                                                         td->o.name);
2297                                 break;
2298                         }
2299
2300                         if (waitee_running(td)) {
2301                                 dprint(FD_PROCESS, "%s: waiting for %s\n",
2302                                                 td->o.name, td->o.wait_for);
2303                                 continue;
2304                         }
2305
2306                         init_disk_util(td);
2307
2308                         td->rusage_sem = fio_sem_init(FIO_SEM_LOCKED);
2309                         td->update_rusage = 0;
2310
2311                         /*
2312                          * Set state to created. Thread will transition
2313                          * to TD_INITIALIZED when it's done setting up.
2314                          */
2315                         td_set_runstate(td, TD_CREATED);
2316                         map[this_jobs++] = td;
2317                         nr_started++;
2318
2319                         fd = calloc(1, sizeof(*fd));
2320                         fd->td = td;
2321                         fd->sk_out = sk_out;
2322
2323                         if (td->o.use_thread) {
2324                                 int ret;
2325
2326                                 dprint(FD_PROCESS, "will pthread_create\n");
2327                                 ret = pthread_create(&td->thread, NULL,
2328                                                         thread_main, fd);
2329                                 if (ret) {
2330                                         log_err("pthread_create: %s\n",
2331                                                         strerror(ret));
2332                                         free(fd);
2333                                         nr_started--;
2334                                         break;
2335                                 }
2336                                 fd = NULL;
2337                                 ret = pthread_detach(td->thread);
2338                                 if (ret)
2339                                         log_err("pthread_detach: %s",
2340                                                         strerror(ret));
2341                         } else {
2342                                 pid_t pid;
2343                                 dprint(FD_PROCESS, "will fork\n");
2344                                 pid = fork();
2345                                 if (!pid) {
2346                                         int ret;
2347
2348                                         ret = (int)(uintptr_t)thread_main(fd);
2349                                         _exit(ret);
2350                                 } else if (i == fio_debug_jobno)
2351                                         *fio_debug_jobp = pid;
2352                         }
2353                         dprint(FD_MUTEX, "wait on startup_sem\n");
2354                         if (fio_sem_down_timeout(startup_sem, 10000)) {
2355                                 log_err("fio: job startup hung? exiting.\n");
2356                                 fio_terminate_threads(TERMINATE_ALL);
2357                                 fio_abort = 1;
2358                                 nr_started--;
2359                                 free(fd);
2360                                 break;
2361                         }
2362                         dprint(FD_MUTEX, "done waiting on startup_sem\n");
2363                 }
2364
2365                 /*
2366                  * Wait for the started threads to transition to
2367                  * TD_INITIALIZED.
2368                  */
2369                 fio_gettime(&this_start, NULL);
2370                 left = this_jobs;
2371                 while (left && !fio_abort) {
2372                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
2373                                 break;
2374
2375                         do_usleep(100000);
2376
2377                         for (i = 0; i < this_jobs; i++) {
2378                                 td = map[i];
2379                                 if (!td)
2380                                         continue;
2381                                 if (td->runstate == TD_INITIALIZED) {
2382                                         map[i] = NULL;
2383                                         left--;
2384                                 } else if (td->runstate >= TD_EXITED) {
2385                                         map[i] = NULL;
2386                                         left--;
2387                                         todo--;
2388                                         nr_running++; /* work-around... */
2389                                 }
2390                         }
2391                 }
2392
2393                 if (left) {
2394                         log_err("fio: %d job%s failed to start\n", left,
2395                                         left > 1 ? "s" : "");
2396                         for (i = 0; i < this_jobs; i++) {
2397                                 td = map[i];
2398                                 if (!td)
2399                                         continue;
2400                                 kill(td->pid, SIGTERM);
2401                         }
2402                         break;
2403                 }
2404
2405                 /*
2406                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
2407                  */
2408                 for_each_td(td, i) {
2409                         if (td->runstate != TD_INITIALIZED)
2410                                 continue;
2411
2412                         if (in_ramp_time(td))
2413                                 td_set_runstate(td, TD_RAMP);
2414                         else
2415                                 td_set_runstate(td, TD_RUNNING);
2416                         nr_running++;
2417                         nr_started--;
2418                         m_rate += ddir_rw_sum(td->o.ratemin);
2419                         t_rate += ddir_rw_sum(td->o.rate);
2420                         todo--;
2421                         fio_sem_up(td->sem);
2422                 }
2423
2424                 reap_threads(&nr_running, &t_rate, &m_rate);
2425
2426                 if (todo)
2427                         do_usleep(100000);
2428         }
2429
2430         while (nr_running) {
2431                 reap_threads(&nr_running, &t_rate, &m_rate);
2432                 do_usleep(10000);
2433         }
2434
2435         fio_idle_prof_stop();
2436
2437         update_io_ticks();
2438 }
2439
2440 static void free_disk_util(void)
2441 {
2442         disk_util_prune_entries();
2443         helper_thread_destroy();
2444 }
2445
2446 int fio_backend(struct sk_out *sk_out)
2447 {
2448         struct thread_data *td;
2449         int i;
2450
2451         if (exec_profile) {
2452                 if (load_profile(exec_profile))
2453                         return 1;
2454                 free(exec_profile);
2455                 exec_profile = NULL;
2456         }
2457         if (!thread_number)
2458                 return 0;
2459
2460         if (write_bw_log) {
2461                 struct log_params p = {
2462                         .log_type = IO_LOG_TYPE_BW,
2463                 };
2464
2465                 setup_log(&agg_io_log[DDIR_READ], &p, "agg-read_bw.log");
2466                 setup_log(&agg_io_log[DDIR_WRITE], &p, "agg-write_bw.log");
2467                 setup_log(&agg_io_log[DDIR_TRIM], &p, "agg-trim_bw.log");
2468         }
2469
2470         startup_sem = fio_sem_init(FIO_SEM_LOCKED);
2471         if (startup_sem == NULL)
2472                 return 1;
2473
2474         set_genesis_time();
2475         stat_init();
2476         helper_thread_create(startup_sem, sk_out);
2477
2478         cgroup_list = smalloc(sizeof(*cgroup_list));
2479         if (cgroup_list)
2480                 INIT_FLIST_HEAD(cgroup_list);
2481
2482         run_threads(sk_out);
2483
2484         helper_thread_exit();
2485
2486         if (!fio_abort) {
2487                 __show_run_stats();
2488                 if (write_bw_log) {
2489                         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
2490                                 struct io_log *log = agg_io_log[i];
2491
2492                                 flush_log(log, false);
2493                                 free_log(log);
2494                         }
2495                 }
2496         }
2497
2498         for_each_td(td, i) {
2499                 steadystate_free(td);
2500                 fio_options_free(td);
2501                 if (td->rusage_sem) {
2502                         fio_sem_remove(td->rusage_sem);
2503                         td->rusage_sem = NULL;
2504                 }
2505                 fio_sem_remove(td->sem);
2506                 td->sem = NULL;
2507         }
2508
2509         free_disk_util();
2510         if (cgroup_list) {
2511                 cgroup_kill(cgroup_list);
2512                 sfree(cgroup_list);
2513         }
2514         sfree(cgroup_mnt);
2515
2516         fio_sem_remove(startup_sem);
2517         stat_exit();
2518         return exit_value;
2519 }