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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  22  *
  23  */
  24 #include <unistd.h>
  25 #include <fcntl.h>
  26 #include <string.h>
  27 #include <limits.h>
  28 #include <signal.h>
  29 #include <time.h>
  30 #include <locale.h>
  31 #include <assert.h>
  32 #include <time.h>
  33 #include <inttypes.h>
  34 #include <sys/stat.h>
  35 #include <sys/wait.h>
  36 #include <sys/ipc.h>
  37 #include <sys/mman.h>
  38 #include <math.h>
  39
  40 #include "fio.h"
  41 #ifndef FIO_NO_HAVE_SHM_H
  42 #include <sys/shm.h>
  43 #endif
  44 #include "hash.h"
  45 #include "smalloc.h"
  46 #include "verify.h"
  47 #include "trim.h"
  48 #include "diskutil.h"
  49 #include "cgroup.h"
  50 #include "profile.h"
  51 #include "lib/rand.h"
  52 #include "lib/memalign.h"
  53 #include "server.h"
  54 #include "lib/getrusage.h"
  55 #include "idletime.h"
  56 #include "err.h"
  57 #include "lib/tp.h"
  58 #include "workqueue.h"
  59 #include "lib/mountcheck.h"
  60
  61 static pthread_t helper_thread;
  62 static pthread_mutex_t helper_lock;
  63 pthread_cond_t helper_cond;
  64 int helper_do_stat = 0;
  65
  66 static struct fio_mutex *startup_mutex;
  67 static struct flist_head *cgroup_list;
  68 static char *cgroup_mnt;
  69 static int exit_value;
  70 static volatile int fio_abort;
  71 static unsigned int nr_process = 0;
  72 static unsigned int nr_thread = 0;
  73
  74 struct io_log *agg_io_log[DDIR_RWDIR_CNT];
  75
  76 int groupid = 0;
  77 unsigned int thread_number = 0;
  78 unsigned int stat_number = 0;
  79 int shm_id = 0;
  80 int temp_stall_ts;
  81 unsigned long done_secs = 0;
  82 volatile int helper_exit = 0;
  83
  84 #define PAGE_ALIGN(buf) \
  85         (char *) (((uintptr_t) (buf) + page_mask) & ~page_mask)
  86
  87 #define JOB_START_TIMEOUT       (5 * 1000)
  88
  89 static void sig_int(int sig)
  90 {
  91         if (threads) {
  92                 if (is_backend)
  93                         fio_server_got_signal(sig);
  94                 else {
  95                         log_info("\nfio: terminating on signal %d\n", sig);
  96                         log_info_flush();
  97                         exit_value = 128;
  98                 }
  99
 100                 fio_terminate_threads(TERMINATE_ALL);
 101         }
 102 }
 103
 104 void sig_show_status(int sig)
 105 {
 106         show_running_run_stats();
 107 }
 108
 109 static void set_sig_handlers(void)
 110 {
 111         struct sigaction act;
 112
 113         memset(&act, 0, sizeof(act));
 114         act.sa_handler = sig_int;
 115         act.sa_flags = SA_RESTART;
 116         sigaction(SIGINT, &act, NULL);
 117
 118         memset(&act, 0, sizeof(act));
 119         act.sa_handler = sig_int;
 120         act.sa_flags = SA_RESTART;
 121         sigaction(SIGTERM, &act, NULL);
 122
 123 /* Windows uses SIGBREAK as a quit signal from other applications */
 124 #ifdef WIN32
 125         memset(&act, 0, sizeof(act));
 126         act.sa_handler = sig_int;
 127         act.sa_flags = SA_RESTART;
 128         sigaction(SIGBREAK, &act, NULL);
 129 #endif
 130
 131         memset(&act, 0, sizeof(act));
 132         act.sa_handler = sig_show_status;
 133         act.sa_flags = SA_RESTART;
 134         sigaction(SIGUSR1, &act, NULL);
 135
 136         if (is_backend) {
 137                 memset(&act, 0, sizeof(act));
 138                 act.sa_handler = sig_int;
 139                 act.sa_flags = SA_RESTART;
 140                 sigaction(SIGPIPE, &act, NULL);
 141         }
 142 }
 143
 144 /*
 145  * Check if we are above the minimum rate given.
 146  */
 147 static bool __check_min_rate(struct thread_data *td, struct timeval *now,
 148                              enum fio_ddir ddir)
 149 {
 150         unsigned long long bytes = 0;
 151         unsigned long iops = 0;
 152         unsigned long spent;
 153         unsigned long rate;
 154         unsigned int ratemin = 0;
 155         unsigned int rate_iops = 0;
 156         unsigned int rate_iops_min = 0;
 157
 158         assert(ddir_rw(ddir));
 159
 160         if (!td->o.ratemin[ddir] && !td->o.rate_iops_min[ddir])
 161                 return false;
 162
 163         /*
 164          * allow a 2 second settle period in the beginning
 165          */
 166         if (mtime_since(&td->start, now) < 2000)
 167                 return false;
 168
 169         iops += td->this_io_blocks[ddir];
 170         bytes += td->this_io_bytes[ddir];
 171         ratemin += td->o.ratemin[ddir];
 172         rate_iops += td->o.rate_iops[ddir];
 173         rate_iops_min += td->o.rate_iops_min[ddir];
 174
 175         /*
 176          * if rate blocks is set, sample is running
 177          */
 178         if (td->rate_bytes[ddir] || td->rate_blocks[ddir]) {
 179                 spent = mtime_since(&td->lastrate[ddir], now);
 180                 if (spent < td->o.ratecycle)
 181                         return false;
 182
 183                 if (td->o.rate[ddir] || td->o.ratemin[ddir]) {
 184                         /*
 185                          * check bandwidth specified rate
 186                          */
 187                         if (bytes < td->rate_bytes[ddir]) {
 188                                 log_err("%s: min rate %u not met\n", td->o.name,
 189                                                                 ratemin);
 190                                 return true;
 191                         } else {
 192                                 if (spent)
 193                                         rate = ((bytes - td->rate_bytes[ddir]) * 1000) / spent;
 194                                 else
 195                                         rate = 0;
 196
 197                                 if (rate < ratemin ||
 198                                     bytes < td->rate_bytes[ddir]) {
 199                                         log_err("%s: min rate %u not met, got"
 200                                                 " %luKB/sec\n", td->o.name,
 201                                                         ratemin, rate);
 202                                         return true;
 203                                 }
 204                         }
 205                 } else {
 206                         /*
 207                          * checks iops specified rate
 208                          */
 209                         if (iops < rate_iops) {
 210                                 log_err("%s: min iops rate %u not met\n",
 211                                                 td->o.name, rate_iops);
 212                                 return true;
 213                         } else {
 214                                 if (spent)
 215                                         rate = ((iops - td->rate_blocks[ddir]) * 1000) / spent;
 216                                 else
 217                                         rate = 0;
 218
 219                                 if (rate < rate_iops_min ||
 220                                     iops < td->rate_blocks[ddir]) {
 221                                         log_err("%s: min iops rate %u not met,"
 222                                                 " got %lu\n", td->o.name,
 223                                                         rate_iops_min, rate);
 224                                         return true;
 225                                 }
 226                         }
 227                 }
 228         }
 229
 230         td->rate_bytes[ddir] = bytes;
 231         td->rate_blocks[ddir] = iops;
 232         memcpy(&td->lastrate[ddir], now, sizeof(*now));
 233         return false;
 234 }
 235
 236 static bool check_min_rate(struct thread_data *td, struct timeval *now)
 237 {
 238         bool ret = false;
 239
 240         if (td->bytes_done[DDIR_READ])
 241                 ret |= __check_min_rate(td, now, DDIR_READ);
 242         if (td->bytes_done[DDIR_WRITE])
 243                 ret |= __check_min_rate(td, now, DDIR_WRITE);
 244         if (td->bytes_done[DDIR_TRIM])
 245                 ret |= __check_min_rate(td, now, DDIR_TRIM);
 246
 247         return ret;
 248 }
 249
 250 /*
 251  * When job exits, we can cancel the in-flight IO if we are using async
 252  * io. Attempt to do so.
 253  */
 254 static void cleanup_pending_aio(struct thread_data *td)
 255 {
 256         int r;
 257
 258         /*
 259          * get immediately available events, if any
 260          */
 261         r = io_u_queued_complete(td, 0);
 262         if (r < 0)
 263                 return;
 264
 265         /*
 266          * now cancel remaining active events
 267          */
 268         if (td->io_ops->cancel) {
 269                 struct io_u *io_u;
 270                 int i;
 271
 272                 io_u_qiter(&td->io_u_all, io_u, i) {
 273                         if (io_u->flags & IO_U_F_FLIGHT) {
 274                                 r = td->io_ops->cancel(td, io_u);
 275                                 if (!r)
 276                                         put_io_u(td, io_u);
 277                         }
 278                 }
 279         }
 280
 281         if (td->cur_depth)
 282                 r = io_u_queued_complete(td, td->cur_depth);
 283 }
 284
 285 /*
 286  * Helper to handle the final sync of a file. Works just like the normal
 287  * io path, just does everything sync.
 288  */
 289 static bool fio_io_sync(struct thread_data *td, struct fio_file *f)
 290 {
 291         struct io_u *io_u = __get_io_u(td);
 292         int ret;
 293
 294         if (!io_u)
 295                 return true;
 296
 297         io_u->ddir = DDIR_SYNC;
 298         io_u->file = f;
 299
 300         if (td_io_prep(td, io_u)) {
 301                 put_io_u(td, io_u);
 302                 return true;
 303         }
 304
 305 requeue:
 306         ret = td_io_queue(td, io_u);
 307         if (ret < 0) {
 308                 td_verror(td, io_u->error, "td_io_queue");
 309                 put_io_u(td, io_u);
 310                 return true;
 311         } else if (ret == FIO_Q_QUEUED) {
 312                 if (io_u_queued_complete(td, 1) < 0)
 313                         return true;
 314         } else if (ret == FIO_Q_COMPLETED) {
 315                 if (io_u->error) {
 316                         td_verror(td, io_u->error, "td_io_queue");
 317                         return true;
 318                 }
 319
 320                 if (io_u_sync_complete(td, io_u) < 0)
 321                         return true;
 322         } else if (ret == FIO_Q_BUSY) {
 323                 if (td_io_commit(td))
 324                         return true;
 325                 goto requeue;
 326         }
 327
 328         return false;
 329 }
 330
 331 static int fio_file_fsync(struct thread_data *td, struct fio_file *f)
 332 {
 333         int ret;
 334
 335         if (fio_file_open(f))
 336                 return fio_io_sync(td, f);
 337
 338         if (td_io_open_file(td, f))
 339                 return 1;
 340
 341         ret = fio_io_sync(td, f);
 342         td_io_close_file(td, f);
 343         return ret;
 344 }
 345
 346 static inline void __update_tv_cache(struct thread_data *td)
 347 {
 348         fio_gettime(&td->tv_cache, NULL);
 349 }
 350
 351 static inline void update_tv_cache(struct thread_data *td)
 352 {
 353         if ((++td->tv_cache_nr & td->tv_cache_mask) == td->tv_cache_mask)
 354                 __update_tv_cache(td);
 355 }
 356
 357 static inline bool runtime_exceeded(struct thread_data *td, struct timeval *t)
 358 {
 359         if (in_ramp_time(td))
 360                 return false;
 361         if (!td->o.timeout)
 362                 return false;
 363         if (utime_since(&td->epoch, t) >= td->o.timeout)
 364                 return true;
 365
 366         return false;
 367 }
 368
 369 /*
 370  * We need to update the runtime consistently in ms, but keep a running
 371  * tally of the current elapsed time in microseconds for sub millisecond
 372  * updates.
 373  */
 374 static inline void update_runtime(struct thread_data *td,
 375                                   unsigned long long *elapsed_us,
 376                                   const enum fio_ddir ddir)
 377 {
 378         if (ddir == DDIR_WRITE && td_write(td) && td->o.verify_only)
 379                 return;
 380
 381         td->ts.runtime[ddir] -= (elapsed_us[ddir] + 999) / 1000;
 382         elapsed_us[ddir] += utime_since_now(&td->start);
 383         td->ts.runtime[ddir] += (elapsed_us[ddir] + 999) / 1000;
 384 }
 385
 386 static bool break_on_this_error(struct thread_data *td, enum fio_ddir ddir,
 387                                 int *retptr)
 388 {
 389         int ret = *retptr;
 390
 391         if (ret < 0 || td->error) {
 392                 int err = td->error;
 393                 enum error_type_bit eb;
 394
 395                 if (ret < 0)
 396                         err = -ret;
 397
 398                 eb = td_error_type(ddir, err);
 399                 if (!(td->o.continue_on_error & (1 << eb)))
 400                         return true;
 401
 402                 if (td_non_fatal_error(td, eb, err)) {
 403                         /*
 404                          * Continue with the I/Os in case of
 405                          * a non fatal error.
 406                          */
 407                         update_error_count(td, err);
 408                         td_clear_error(td);
 409                         *retptr = 0;
 410                         return false;
 411                 } else if (td->o.fill_device && err == ENOSPC) {
 412                         /*
 413                          * We expect to hit this error if
 414                          * fill_device option is set.
 415                          */
 416                         td_clear_error(td);
 417                         fio_mark_td_terminate(td);
 418                         return true;
 419                 } else {
 420                         /*
 421                          * Stop the I/O in case of a fatal
 422                          * error.
 423                          */
 424                         update_error_count(td, err);
 425                         return true;
 426                 }
 427         }
 428
 429         return false;
 430 }
 431
 432 static void check_update_rusage(struct thread_data *td)
 433 {
 434         if (td->update_rusage) {
 435                 td->update_rusage = 0;
 436                 update_rusage_stat(td);
 437                 fio_mutex_up(td->rusage_sem);
 438         }
 439 }
 440
 441 static int wait_for_completions(struct thread_data *td, struct timeval *time)
 442 {
 443         const int full = queue_full(td);
 444         int min_evts = 0;
 445         int ret;
 446
 447         /*
 448          * if the queue is full, we MUST reap at least 1 event
 449          */
 450         min_evts = min(td->o.iodepth_batch_complete_min, td->cur_depth);
 451         if ((full && !min_evts) || !td->o.iodepth_batch_complete_min)
 452                 min_evts = 1;
 453
 454         if (time && (__should_check_rate(td, DDIR_READ) ||
 455             __should_check_rate(td, DDIR_WRITE) ||
 456             __should_check_rate(td, DDIR_TRIM)))
 457                 fio_gettime(time, NULL);
 458
 459         do {
 460                 ret = io_u_queued_complete(td, min_evts);
 461                 if (ret < 0)
 462                         break;
 463         } while (full && (td->cur_depth > td->o.iodepth_low));
 464
 465         return ret;
 466 }
 467
 468 int io_queue_event(struct thread_data *td, struct io_u *io_u, int *ret,
 469                    enum fio_ddir ddir, uint64_t *bytes_issued, int from_verify,
 470                    struct timeval *comp_time)
 471 {
 472         int ret2;
 473
 474         switch (*ret) {
 475         case FIO_Q_COMPLETED:
 476                 if (io_u->error) {
 477                         *ret = -io_u->error;
 478                         clear_io_u(td, io_u);
 479                 } else if (io_u->resid) {
 480                         int bytes = io_u->xfer_buflen - io_u->resid;
 481                         struct fio_file *f = io_u->file;
 482
 483                         if (bytes_issued)
 484                                 *bytes_issued += bytes;
 485
 486                         if (!from_verify)
 487                                 trim_io_piece(td, io_u);
 488
 489                         /*
 490                          * zero read, fail
 491                          */
 492                         if (!bytes) {
 493                                 if (!from_verify)
 494                                         unlog_io_piece(td, io_u);
 495                                 td_verror(td, EIO, "full resid");
 496                                 put_io_u(td, io_u);
 497                                 break;
 498                         }
 499
 500                         io_u->xfer_buflen = io_u->resid;
 501                         io_u->xfer_buf += bytes;
 502                         io_u->offset += bytes;
 503
 504                         if (ddir_rw(io_u->ddir))
 505                                 td->ts.short_io_u[io_u->ddir]++;
 506
 507                         f = io_u->file;
 508                         if (io_u->offset == f->real_file_size)
 509                                 goto sync_done;
 510
 511                         requeue_io_u(td, &io_u);
 512                 } else {
 513 sync_done:
 514                         if (comp_time && (__should_check_rate(td, DDIR_READ) ||
 515                             __should_check_rate(td, DDIR_WRITE) ||
 516                             __should_check_rate(td, DDIR_TRIM)))
 517                                 fio_gettime(comp_time, NULL);
 518
 519                         *ret = io_u_sync_complete(td, io_u);
 520                         if (*ret < 0)
 521                                 break;
 522                 }
 523                 return 0;
 524         case FIO_Q_QUEUED:
 525                 /*
 526                  * if the engine doesn't have a commit hook,
 527                  * the io_u is really queued. if it does have such
 528                  * a hook, it has to call io_u_queued() itself.
 529                  */
 530                 if (td->io_ops->commit == NULL)
 531                         io_u_queued(td, io_u);
 532                 if (bytes_issued)
 533                         *bytes_issued += io_u->xfer_buflen;
 534                 break;
 535         case FIO_Q_BUSY:
 536                 if (!from_verify)
 537                         unlog_io_piece(td, io_u);
 538                 requeue_io_u(td, &io_u);
 539                 ret2 = td_io_commit(td);
 540                 if (ret2 < 0)
 541                         *ret = ret2;
 542                 break;
 543         default:
 544                 assert(*ret < 0);
 545                 td_verror(td, -(*ret), "td_io_queue");
 546                 break;
 547         }
 548
 549         if (break_on_this_error(td, ddir, ret))
 550                 return 1;
 551
 552         return 0;
 553 }
 554
 555 static inline bool io_in_polling(struct thread_data *td)
 556 {
 557         return !td->o.iodepth_batch_complete_min &&
 558                    !td->o.iodepth_batch_complete_max;
 559 }
 560
 561 /*
 562  * The main verify engine. Runs over the writes we previously submitted,
 563  * reads the blocks back in, and checks the crc/md5 of the data.
 564  */
 565 static void do_verify(struct thread_data *td, uint64_t verify_bytes)
 566 {
 567         struct fio_file *f;
 568         struct io_u *io_u;
 569         int ret, min_events;
 570         unsigned int i;
 571
 572         dprint(FD_VERIFY, "starting loop\n");
 573
 574         /*
 575          * sync io first and invalidate cache, to make sure we really
 576          * read from disk.
 577          */
 578         for_each_file(td, f, i) {
 579                 if (!fio_file_open(f))
 580                         continue;
 581                 if (fio_io_sync(td, f))
 582                         break;
 583                 if (file_invalidate_cache(td, f))
 584                         break;
 585         }
 586
 587         check_update_rusage(td);
 588
 589         if (td->error)
 590                 return;
 591
 592         td_set_runstate(td, TD_VERIFYING);
 593
 594         io_u = NULL;
 595         while (!td->terminate) {
 596                 enum fio_ddir ddir;
 597                 int full;
 598
 599                 update_tv_cache(td);
 600                 check_update_rusage(td);
 601
 602                 if (runtime_exceeded(td, &td->tv_cache)) {
 603                         __update_tv_cache(td);
 604                         if (runtime_exceeded(td, &td->tv_cache)) {
 605                                 fio_mark_td_terminate(td);
 606                                 break;
 607                         }
 608                 }
 609
 610                 if (flow_threshold_exceeded(td))
 611                         continue;
 612
 613                 if (!td->o.experimental_verify) {
 614                         io_u = __get_io_u(td);
 615                         if (!io_u)
 616                                 break;
 617
 618                         if (get_next_verify(td, io_u)) {
 619                                 put_io_u(td, io_u);
 620                                 break;
 621                         }
 622
 623                         if (td_io_prep(td, io_u)) {
 624                                 put_io_u(td, io_u);
 625                                 break;
 626                         }
 627                 } else {
 628                         if (ddir_rw_sum(td->bytes_done) + td->o.rw_min_bs > verify_bytes)
 629                                 break;
 630
 631                         while ((io_u = get_io_u(td)) != NULL) {
 632                                 if (IS_ERR(io_u)) {
 633                                         io_u = NULL;
 634                                         ret = FIO_Q_BUSY;
 635                                         goto reap;
 636                                 }
 637
 638                                 /*
 639                                  * We are only interested in the places where
 640                                  * we wrote or trimmed IOs. Turn those into
 641                                  * reads for verification purposes.
 642                                  */
 643                                 if (io_u->ddir == DDIR_READ) {
 644                                         /*
 645                                          * Pretend we issued it for rwmix
 646                                          * accounting
 647                                          */
 648                                         td->io_issues[DDIR_READ]++;
 649                                         put_io_u(td, io_u);
 650                                         continue;
 651                                 } else if (io_u->ddir == DDIR_TRIM) {
 652                                         io_u->ddir = DDIR_READ;
 653                                         io_u_set(io_u, IO_U_F_TRIMMED);
 654                                         break;
 655                                 } else if (io_u->ddir == DDIR_WRITE) {
 656                                         io_u->ddir = DDIR_READ;
 657                                         break;
 658                                 } else {
 659                                         put_io_u(td, io_u);
 660                                         continue;
 661                                 }
 662                         }
 663
 664                         if (!io_u)
 665                                 break;
 666                 }
 667
 668                 if (verify_state_should_stop(td, io_u)) {
 669                         put_io_u(td, io_u);
 670                         break;
 671                 }
 672
 673                 if (td->o.verify_async)
 674                         io_u->end_io = verify_io_u_async;
 675                 else
 676                         io_u->end_io = verify_io_u;
 677
 678                 ddir = io_u->ddir;
 679                 if (!td->o.disable_slat)
 680                         fio_gettime(&io_u->start_time, NULL);
 681
 682                 ret = td_io_queue(td, io_u);
 683
 684                 if (io_queue_event(td, io_u, &ret, ddir, NULL, 1, NULL))
 685                         break;
 686
 687                 /*
 688                  * if we can queue more, do so. but check if there are
 689                  * completed io_u's first. Note that we can get BUSY even
 690                  * without IO queued, if the system is resource starved.
 691                  */
 692 reap:
 693                 full = queue_full(td) || (ret == FIO_Q_BUSY && td->cur_depth);
 694                 if (full || io_in_polling(td))
 695                         ret = wait_for_completions(td, NULL);
 696
 697                 if (ret < 0)
 698                         break;
 699         }
 700
 701         check_update_rusage(td);
 702
 703         if (!td->error) {
 704                 min_events = td->cur_depth;
 705
 706                 if (min_events)
 707                         ret = io_u_queued_complete(td, min_events);
 708         } else
 709                 cleanup_pending_aio(td);
 710
 711         td_set_runstate(td, TD_RUNNING);
 712
 713         dprint(FD_VERIFY, "exiting loop\n");
 714 }
 715
 716 static bool exceeds_number_ios(struct thread_data *td)
 717 {
 718         unsigned long long number_ios;
 719
 720         if (!td->o.number_ios)
 721                 return false;
 722
 723         number_ios = ddir_rw_sum(td->io_blocks);
 724         number_ios += td->io_u_queued + td->io_u_in_flight;
 725
 726         return number_ios >= (td->o.number_ios * td->loops);
 727 }
 728
 729 static bool io_issue_bytes_exceeded(struct thread_data *td)
 730 {
 731         unsigned long long bytes, limit;
 732
 733         if (td_rw(td))
 734                 bytes = td->io_issue_bytes[DDIR_READ] + td->io_issue_bytes[DDIR_WRITE];
 735         else if (td_write(td))
 736                 bytes = td->io_issue_bytes[DDIR_WRITE];
 737         else if (td_read(td))
 738                 bytes = td->io_issue_bytes[DDIR_READ];
 739         else
 740                 bytes = td->io_issue_bytes[DDIR_TRIM];
 741
 742         if (td->o.io_limit)
 743                 limit = td->o.io_limit;
 744         else
 745                 limit = td->o.size;
 746
 747         limit *= td->loops;
 748         return bytes >= limit || exceeds_number_ios(td);
 749 }
 750
 751 static bool io_complete_bytes_exceeded(struct thread_data *td)
 752 {
 753         unsigned long long bytes, limit;
 754
 755         if (td_rw(td))
 756                 bytes = td->this_io_bytes[DDIR_READ] + td->this_io_bytes[DDIR_WRITE];
 757         else if (td_write(td))
 758                 bytes = td->this_io_bytes[DDIR_WRITE];
 759         else if (td_read(td))
 760                 bytes = td->this_io_bytes[DDIR_READ];
 761         else
 762                 bytes = td->this_io_bytes[DDIR_TRIM];
 763
 764         if (td->o.io_limit)
 765                 limit = td->o.io_limit;
 766         else
 767                 limit = td->o.size;
 768
 769         limit *= td->loops;
 770         return bytes >= limit || exceeds_number_ios(td);
 771 }
 772
 773 /*
 774  * used to calculate the next io time for rate control
 775  *
 776  */
 777 static long long usec_for_io(struct thread_data *td, enum fio_ddir ddir)
 778 {
 779         uint64_t secs, remainder, bps, bytes, iops;
 780
 781         assert(!(td->flags & TD_F_CHILD));
 782         bytes = td->rate_io_issue_bytes[ddir];
 783         bps = td->rate_bps[ddir];
 784
 785         if (td->o.rate_process == RATE_PROCESS_POISSON) {
 786                 uint64_t val;
 787                 iops = bps / td->o.bs[ddir];
 788                 val = (int64_t) (1000000 / iops) *
 789                                 -logf(__rand_0_1(&td->poisson_state));
 790                 if (val) {
 791                         dprint(FD_RATE, "poisson rate iops=%llu\n",
 792                                         (unsigned long long) 1000000 / val);
 793                 }
 794                 td->last_usec += val;
 795                 return td->last_usec;
 796         } else if (bps) {
 797                 secs = bytes / bps;
 798                 remainder = bytes % bps;
 799                 return remainder * 1000000 / bps + secs * 1000000;
 800         }
 801
 802         return 0;
 803 }
 804
 805 /*
 806  * Main IO worker function. It retrieves io_u's to process and queues
 807  * and reaps them, checking for rate and errors along the way.
 808  *
 809  * Returns number of bytes written and trimmed.
 810  */
 811 static uint64_t do_io(struct thread_data *td)
 812 {
 813         unsigned int i;
 814         int ret = 0;
 815         uint64_t total_bytes, bytes_issued = 0;
 816
 817         if (in_ramp_time(td))
 818                 td_set_runstate(td, TD_RAMP);
 819         else
 820                 td_set_runstate(td, TD_RUNNING);
 821
 822         lat_target_init(td);
 823
 824         total_bytes = td->o.size;
 825         /*
 826         * Allow random overwrite workloads to write up to io_limit
 827         * before starting verification phase as 'size' doesn't apply.
 828         */
 829         if (td_write(td) && td_random(td) && td->o.norandommap)
 830                 total_bytes = max(total_bytes, (uint64_t) td->o.io_limit);
 831         /*
 832          * If verify_backlog is enabled, we'll run the verify in this
 833          * handler as well. For that case, we may need up to twice the
 834          * amount of bytes.
 835          */
 836         if (td->o.verify != VERIFY_NONE &&
 837            (td_write(td) && td->o.verify_backlog))
 838                 total_bytes += td->o.size;
 839
 840         /* In trimwrite mode, each byte is trimmed and then written, so
 841          * allow total_bytes to be twice as big */
 842         if (td_trimwrite(td))
 843                 total_bytes += td->total_io_size;
 844
 845         while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
 846                 (!flist_empty(&td->trim_list)) || !io_issue_bytes_exceeded(td) ||
 847                 td->o.time_based) {
 848                 struct timeval comp_time;
 849                 struct io_u *io_u;
 850                 int full;
 851                 enum fio_ddir ddir;
 852
 853                 check_update_rusage(td);
 854
 855                 if (td->terminate || td->done)
 856                         break;
 857
 858                 update_tv_cache(td);
 859
 860                 if (runtime_exceeded(td, &td->tv_cache)) {
 861                         __update_tv_cache(td);
 862                         if (runtime_exceeded(td, &td->tv_cache)) {
 863                                 fio_mark_td_terminate(td);
 864                                 break;
 865                         }
 866                 }
 867
 868                 if (flow_threshold_exceeded(td))
 869                         continue;
 870
 871                 if (!td->o.time_based && bytes_issued >= total_bytes)
 872                         break;
 873
 874                 io_u = get_io_u(td);
 875                 if (IS_ERR_OR_NULL(io_u)) {
 876                         int err = PTR_ERR(io_u);
 877
 878                         io_u = NULL;
 879                         if (err == -EBUSY) {
 880                                 ret = FIO_Q_BUSY;
 881                                 goto reap;
 882                         }
 883                         if (td->o.latency_target)
 884                                 goto reap;
 885                         break;
 886                 }
 887
 888                 ddir = io_u->ddir;
 889
 890                 /*
 891                  * Add verification end_io handler if:
 892                  *      - Asked to verify (!td_rw(td))
 893                  *      - Or the io_u is from our verify list (mixed write/ver)
 894                  */
 895                 if (td->o.verify != VERIFY_NONE && io_u->ddir == DDIR_READ &&
 896                     ((io_u->flags & IO_U_F_VER_LIST) || !td_rw(td))) {
 897
 898                         if (!td->o.verify_pattern_bytes) {
 899                                 io_u->rand_seed = __rand(&td->verify_state);
 900                                 if (sizeof(int) != sizeof(long *))
 901                                         io_u->rand_seed *= __rand(&td->verify_state);
 902                         }
 903
 904                         if (verify_state_should_stop(td, io_u)) {
 905                                 put_io_u(td, io_u);
 906                                 break;
 907                         }
 908
 909                         if (td->o.verify_async)
 910                                 io_u->end_io = verify_io_u_async;
 911                         else
 912                                 io_u->end_io = verify_io_u;
 913                         td_set_runstate(td, TD_VERIFYING);
 914                 } else if (in_ramp_time(td))
 915                         td_set_runstate(td, TD_RAMP);
 916                 else
 917                         td_set_runstate(td, TD_RUNNING);
 918
 919                 /*
 920                  * Always log IO before it's issued, so we know the specific
 921                  * order of it. The logged unit will track when the IO has
 922                  * completed.
 923                  */
 924                 if (td_write(td) && io_u->ddir == DDIR_WRITE &&
 925                     td->o.do_verify &&
 926                     td->o.verify != VERIFY_NONE &&
 927                     !td->o.experimental_verify)
 928                         log_io_piece(td, io_u);
 929
 930                 if (td->o.io_submit_mode == IO_MODE_OFFLOAD) {
 931                         const unsigned long blen = io_u->xfer_buflen;
 932                         const enum fio_ddir ddir = acct_ddir(io_u);
 933
 934                         if (td->error)
 935                                 break;
 936
 937                         ret = workqueue_enqueue(&td->io_wq, &io_u->work);
 938                         if (ret)
 939                                 ret = FIO_Q_QUEUED;
 940                         else
 941                                 ret = FIO_Q_BUSY;
 942
 943                         if (ret == FIO_Q_QUEUED && ddir_rw(ddir)) {
 944                                 td->io_issues[ddir]++;
 945                                 td->io_issue_bytes[ddir] += blen;
 946                                 td->rate_io_issue_bytes[ddir] += blen;
 947                         }
 948
 949                         if (should_check_rate(td))
 950                                 td->rate_next_io_time[ddir] = usec_for_io(td, ddir);
 951
 952                 } else {
 953                         ret = td_io_queue(td, io_u);
 954
 955                         if (should_check_rate(td))
 956                                 td->rate_next_io_time[ddir] = usec_for_io(td, ddir);
 957
 958                         if (io_queue_event(td, io_u, &ret, ddir, &bytes_issued, 0, &comp_time))
 959                                 break;
 960
 961                         /*
 962                          * See if we need to complete some commands. Note that
 963                          * we can get BUSY even without IO queued, if the
 964                          * system is resource starved.
 965                          */
 966 reap:
 967                         full = queue_full(td) ||
 968                                 (ret == FIO_Q_BUSY && td->cur_depth);
 969                         if (full || io_in_polling(td))
 970                                 ret = wait_for_completions(td, &comp_time);
 971                 }
 972                 if (ret < 0)
 973                         break;
 974                 if (!ddir_rw_sum(td->bytes_done) &&
 975                     !(td->io_ops->flags & FIO_NOIO))
 976                         continue;
 977
 978                 if (!in_ramp_time(td) && should_check_rate(td)) {
 979                         if (check_min_rate(td, &comp_time)) {
 980                                 if (exitall_on_terminate)
 981                                         fio_terminate_threads(td->groupid);
 982                                 td_verror(td, EIO, "check_min_rate");
 983                                 break;
 984                         }
 985                 }
 986                 if (!in_ramp_time(td) && td->o.latency_target)
 987                         lat_target_check(td);
 988
 989                 if (td->o.thinktime) {
 990                         unsigned long long b;
 991
 992                         b = ddir_rw_sum(td->io_blocks);
 993                         if (!(b % td->o.thinktime_blocks)) {
 994                                 int left;
 995
 996                                 io_u_quiesce(td);
 997
 998                                 if (td->o.thinktime_spin)
 999                                         usec_spin(td->o.thinktime_spin);
1000
1001                                 left = td->o.thinktime - td->o.thinktime_spin;
1002                                 if (left)
1003                                         usec_sleep(td, left);
1004                         }
1005                 }
1006         }
1007
1008         check_update_rusage(td);
1009
1010         if (td->trim_entries)
1011                 log_err("fio: %lu trim entries leaked?\n", td->trim_entries);
1012
1013         if (td->o.fill_device && td->error == ENOSPC) {
1014                 td->error = 0;
1015                 fio_mark_td_terminate(td);
1016         }
1017         if (!td->error) {
1018                 struct fio_file *f;
1019
1020                 if (td->o.io_submit_mode == IO_MODE_OFFLOAD) {
1021                         workqueue_flush(&td->io_wq);
1022                         i = 0;
1023                 } else
1024                         i = td->cur_depth;
1025
1026                 if (i) {
1027                         ret = io_u_queued_complete(td, i);
1028                         if (td->o.fill_device && td->error == ENOSPC)
1029                                 td->error = 0;
1030                 }
1031
1032                 if (should_fsync(td) && td->o.end_fsync) {
1033                         td_set_runstate(td, TD_FSYNCING);
1034
1035                         for_each_file(td, f, i) {
1036                                 if (!fio_file_fsync(td, f))
1037                                         continue;
1038
1039                                 log_err("fio: end_fsync failed for file %s\n",
1040                                                                 f->file_name);
1041                         }
1042                 }
1043         } else
1044                 cleanup_pending_aio(td);
1045
1046         /*
1047          * stop job if we failed doing any IO
1048          */
1049         if (!ddir_rw_sum(td->this_io_bytes))
1050                 td->done = 1;
1051
1052         return td->bytes_done[DDIR_WRITE] + td->bytes_done[DDIR_TRIM];
1053 }
1054
1055 static void cleanup_io_u(struct thread_data *td)
1056 {
1057         struct io_u *io_u;
1058
1059         while ((io_u = io_u_qpop(&td->io_u_freelist)) != NULL) {
1060
1061                 if (td->io_ops->io_u_free)
1062                         td->io_ops->io_u_free(td, io_u);
1063
1064                 fio_memfree(io_u, sizeof(*io_u));
1065         }
1066
1067         free_io_mem(td);
1068
1069         io_u_rexit(&td->io_u_requeues);
1070         io_u_qexit(&td->io_u_freelist);
1071         io_u_qexit(&td->io_u_all);
1072
1073         if (td->last_write_comp)
1074                 sfree(td->last_write_comp);
1075 }
1076
1077 static int init_io_u(struct thread_data *td)
1078 {
1079         struct io_u *io_u;
1080         unsigned int max_bs, min_write;
1081         int cl_align, i, max_units;
1082         int data_xfer = 1, err;
1083         char *p;
1084
1085         max_units = td->o.iodepth;
1086         max_bs = td_max_bs(td);
1087         min_write = td->o.min_bs[DDIR_WRITE];
1088         td->orig_buffer_size = (unsigned long long) max_bs
1089                                         * (unsigned long long) max_units;
1090
1091         if ((td->io_ops->flags & FIO_NOIO) || !(td_read(td) || td_write(td)))
1092                 data_xfer = 0;
1093
1094         err = 0;
1095         err += io_u_rinit(&td->io_u_requeues, td->o.iodepth);
1096         err += io_u_qinit(&td->io_u_freelist, td->o.iodepth);
1097         err += io_u_qinit(&td->io_u_all, td->o.iodepth);
1098
1099         if (err) {
1100                 log_err("fio: failed setting up IO queues\n");
1101                 return 1;
1102         }
1103
1104         /*
1105          * if we may later need to do address alignment, then add any
1106          * possible adjustment here so that we don't cause a buffer
1107          * overflow later. this adjustment may be too much if we get
1108          * lucky and the allocator gives us an aligned address.
1109          */
1110         if (td->o.odirect || td->o.mem_align || td->o.oatomic ||
1111             (td->io_ops->flags & FIO_RAWIO))
1112                 td->orig_buffer_size += page_mask + td->o.mem_align;
1113
1114         if (td->o.mem_type == MEM_SHMHUGE || td->o.mem_type == MEM_MMAPHUGE) {
1115                 unsigned long bs;
1116
1117                 bs = td->orig_buffer_size + td->o.hugepage_size - 1;
1118                 td->orig_buffer_size = bs & ~(td->o.hugepage_size - 1);
1119         }
1120
1121         if (td->orig_buffer_size != (size_t) td->orig_buffer_size) {
1122                 log_err("fio: IO memory too large. Reduce max_bs or iodepth\n");
1123                 return 1;
1124         }
1125
1126         if (data_xfer && allocate_io_mem(td))
1127                 return 1;
1128
1129         if (td->o.odirect || td->o.mem_align || td->o.oatomic ||
1130             (td->io_ops->flags & FIO_RAWIO))
1131                 p = PAGE_ALIGN(td->orig_buffer) + td->o.mem_align;
1132         else
1133                 p = td->orig_buffer;
1134
1135         cl_align = os_cache_line_size();
1136
1137         for (i = 0; i < max_units; i++) {
1138                 void *ptr;
1139
1140                 if (td->terminate)
1141                         return 1;
1142
1143                 ptr = fio_memalign(cl_align, sizeof(*io_u));
1144                 if (!ptr) {
1145                         log_err("fio: unable to allocate aligned memory\n");
1146                         break;
1147                 }
1148
1149                 io_u = ptr;
1150                 memset(io_u, 0, sizeof(*io_u));
1151                 INIT_FLIST_HEAD(&io_u->verify_list);
1152                 dprint(FD_MEM, "io_u alloc %p, index %u\n", io_u, i);
1153
1154                 if (data_xfer) {
1155                         io_u->buf = p;
1156                         dprint(FD_MEM, "io_u %p, mem %p\n", io_u, io_u->buf);
1157
1158                         if (td_write(td))
1159                                 io_u_fill_buffer(td, io_u, min_write, max_bs);
1160                         if (td_write(td) && td->o.verify_pattern_bytes) {
1161                                 /*
1162                                  * Fill the buffer with the pattern if we are
1163                                  * going to be doing writes.
1164                                  */
1165                                 fill_verify_pattern(td, io_u->buf, max_bs, io_u, 0, 0);
1166                         }
1167                 }
1168
1169                 io_u->index = i;
1170                 io_u->flags = IO_U_F_FREE;
1171                 io_u_qpush(&td->io_u_freelist, io_u);
1172
1173                 /*
1174                  * io_u never leaves this stack, used for iteration of all
1175                  * io_u buffers.
1176                  */
1177                 io_u_qpush(&td->io_u_all, io_u);
1178
1179                 if (td->io_ops->io_u_init) {
1180                         int ret = td->io_ops->io_u_init(td, io_u);
1181
1182                         if (ret) {
1183                                 log_err("fio: failed to init engine data: %d\n", ret);
1184                                 return 1;
1185                         }
1186                 }
1187
1188                 p += max_bs;
1189         }
1190
1191         if (td->o.verify != VERIFY_NONE) {
1192                 td->last_write_comp = scalloc(max_units, sizeof(uint64_t));
1193                 if (!td->last_write_comp) {
1194                         log_err("fio: failed to alloc write comp data\n");
1195                         return 1;
1196                 }
1197         }
1198
1199         return 0;
1200 }
1201
1202 static int switch_ioscheduler(struct thread_data *td)
1203 {
1204         char tmp[256], tmp2[128];
1205         FILE *f;
1206         int ret;
1207
1208         if (td->io_ops->flags & FIO_DISKLESSIO)
1209                 return 0;
1210
1211         sprintf(tmp, "%s/queue/scheduler", td->sysfs_root);
1212
1213         f = fopen(tmp, "r+");
1214         if (!f) {
1215                 if (errno == ENOENT) {
1216                         log_err("fio: os or kernel doesn't support IO scheduler"
1217                                 " switching\n");
1218                         return 0;
1219                 }
1220                 td_verror(td, errno, "fopen iosched");
1221                 return 1;
1222         }
1223
1224         /*
1225          * Set io scheduler.
1226          */
1227         ret = fwrite(td->o.ioscheduler, strlen(td->o.ioscheduler), 1, f);
1228         if (ferror(f) || ret != 1) {
1229                 td_verror(td, errno, "fwrite");
1230                 fclose(f);
1231                 return 1;
1232         }
1233
1234         rewind(f);
1235
1236         /*
1237          * Read back and check that the selected scheduler is now the default.
1238          */
1239         memset(tmp, 0, sizeof(tmp));
1240         ret = fread(tmp, sizeof(tmp), 1, f);
1241         if (ferror(f) || ret < 0) {
1242                 td_verror(td, errno, "fread");
1243                 fclose(f);
1244                 return 1;
1245         }
1246         /*
1247          * either a list of io schedulers or "none\n" is expected.
1248          */
1249         tmp[strlen(tmp) - 1] = '\0';
1250
1251
1252         sprintf(tmp2, "[%s]", td->o.ioscheduler);
1253         if (!strstr(tmp, tmp2)) {
1254                 log_err("fio: io scheduler %s not found\n", td->o.ioscheduler);
1255                 td_verror(td, EINVAL, "iosched_switch");
1256                 fclose(f);
1257                 return 1;
1258         }
1259
1260         fclose(f);
1261         return 0;
1262 }
1263
1264 static bool keep_running(struct thread_data *td)
1265 {
1266         unsigned long long limit;
1267
1268         if (td->done)
1269                 return false;
1270         if (td->o.time_based)
1271                 return true;
1272         if (td->o.loops) {
1273                 td->o.loops--;
1274                 return true;
1275         }
1276         if (exceeds_number_ios(td))
1277                 return false;
1278
1279         if (td->o.io_limit)
1280                 limit = td->o.io_limit;
1281         else
1282                 limit = td->o.size;
1283
1284         if (limit != -1ULL && ddir_rw_sum(td->io_bytes) < limit) {
1285                 uint64_t diff;
1286
1287                 /*
1288                  * If the difference is less than the minimum IO size, we
1289                  * are done.
1290                  */
1291                 diff = limit - ddir_rw_sum(td->io_bytes);
1292                 if (diff < td_max_bs(td))
1293                         return false;
1294
1295                 if (fio_files_done(td))
1296                         return false;
1297
1298                 return true;
1299         }
1300
1301         return false;
1302 }
1303
1304 static int exec_string(struct thread_options *o, const char *string, const char *mode)
1305 {
1306         size_t newlen = strlen(string) + strlen(o->name) + strlen(mode) + 9 + 1;
1307         int ret;
1308         char *str;
1309
1310         str = malloc(newlen);
1311         sprintf(str, "%s &> %s.%s.txt", string, o->name, mode);
1312
1313         log_info("%s : Saving output of %s in %s.%s.txt\n",o->name, mode, o->name, mode);
1314         ret = system(str);
1315         if (ret == -1)
1316                 log_err("fio: exec of cmd <%s> failed\n", str);
1317
1318         free(str);
1319         return ret;
1320 }
1321
1322 /*
1323  * Dry run to compute correct state of numberio for verification.
1324  */
1325 static uint64_t do_dry_run(struct thread_data *td)
1326 {
1327         td_set_runstate(td, TD_RUNNING);
1328
1329         while ((td->o.read_iolog_file && !flist_empty(&td->io_log_list)) ||
1330                 (!flist_empty(&td->trim_list)) || !io_complete_bytes_exceeded(td)) {
1331                 struct io_u *io_u;
1332                 int ret;
1333
1334                 if (td->terminate || td->done)
1335                         break;
1336
1337                 io_u = get_io_u(td);
1338                 if (!io_u)
1339                         break;
1340
1341                 io_u_set(io_u, IO_U_F_FLIGHT);
1342                 io_u->error = 0;
1343                 io_u->resid = 0;
1344                 if (ddir_rw(acct_ddir(io_u)))
1345                         td->io_issues[acct_ddir(io_u)]++;
1346                 if (ddir_rw(io_u->ddir)) {
1347                         io_u_mark_depth(td, 1);
1348                         td->ts.total_io_u[io_u->ddir]++;
1349                 }
1350
1351                 if (td_write(td) && io_u->ddir == DDIR_WRITE &&
1352                     td->o.do_verify &&
1353                     td->o.verify != VERIFY_NONE &&
1354                     !td->o.experimental_verify)
1355                         log_io_piece(td, io_u);
1356
1357                 ret = io_u_sync_complete(td, io_u);
1358                 (void) ret;
1359         }
1360
1361         return td->bytes_done[DDIR_WRITE] + td->bytes_done[DDIR_TRIM];
1362 }
1363
1364 static void io_workqueue_fn(struct thread_data *td, struct workqueue_work *work)
1365 {
1366         struct io_u *io_u = container_of(work, struct io_u, work);
1367         const enum fio_ddir ddir = io_u->ddir;
1368         int ret;
1369
1370         dprint(FD_RATE, "io_u %p queued by %u\n", io_u, gettid());
1371
1372         io_u_set(io_u, IO_U_F_NO_FILE_PUT);
1373
1374         td->cur_depth++;
1375
1376         do {
1377                 ret = td_io_queue(td, io_u);
1378                 if (ret != FIO_Q_BUSY)
1379                         break;
1380                 ret = io_u_queued_complete(td, 1);
1381                 if (ret > 0)
1382                         td->cur_depth -= ret;
1383                 io_u_clear(io_u, IO_U_F_FLIGHT);
1384         } while (1);
1385
1386         dprint(FD_RATE, "io_u %p ret %d by %u\n", io_u, ret, gettid());
1387
1388         io_queue_event(td, io_u, &ret, ddir, NULL, 0, NULL);
1389
1390         if (ret == FIO_Q_COMPLETED)
1391                 td->cur_depth--;
1392         else if (ret == FIO_Q_QUEUED) {
1393                 unsigned int min_evts;
1394
1395                 if (td->o.iodepth == 1)
1396                         min_evts = 1;
1397                 else
1398                         min_evts = 0;
1399
1400                 ret = io_u_queued_complete(td, min_evts);
1401                 if (ret > 0)
1402                         td->cur_depth -= ret;
1403         } else if (ret == FIO_Q_BUSY) {
1404                 ret = io_u_queued_complete(td, td->cur_depth);
1405                 if (ret > 0)
1406                         td->cur_depth -= ret;
1407         }
1408 }
1409
1410 static bool io_workqueue_pre_sleep_flush_fn(struct thread_data *td)
1411 {
1412         if (td->io_u_queued || td->cur_depth || td->io_u_in_flight)
1413                 return true;
1414
1415         return false;
1416 }
1417
1418 static void io_workqueue_pre_sleep_fn(struct thread_data *td)
1419 {
1420         int ret;
1421
1422         ret = io_u_quiesce(td);
1423         if (ret > 0)
1424                 td->cur_depth -= ret;
1425 }
1426
1427 struct workqueue_ops rated_wq_ops = {
1428         .fn                     = io_workqueue_fn,
1429         .pre_sleep_flush_fn     = io_workqueue_pre_sleep_flush_fn,
1430         .pre_sleep_fn           = io_workqueue_pre_sleep_fn,
1431 };
1432
1433 /*
1434  * Entry point for the thread based jobs. The process based jobs end up
1435  * here as well, after a little setup.
1436  */
1437 static void *thread_main(void *data)
1438 {
1439         unsigned long long elapsed_us[DDIR_RWDIR_CNT] = { 0, };
1440         struct thread_data *td = data;
1441         struct thread_options *o = &td->o;
1442         pthread_condattr_t attr;
1443         int clear_state;
1444         int ret;
1445
1446         if (!o->use_thread) {
1447                 setsid();
1448                 td->pid = getpid();
1449         } else
1450                 td->pid = gettid();
1451
1452         fio_local_clock_init(o->use_thread);
1453
1454         dprint(FD_PROCESS, "jobs pid=%d started\n", (int) td->pid);
1455
1456         if (is_backend)
1457                 fio_server_send_start(td);
1458
1459         INIT_FLIST_HEAD(&td->io_log_list);
1460         INIT_FLIST_HEAD(&td->io_hist_list);
1461         INIT_FLIST_HEAD(&td->verify_list);
1462         INIT_FLIST_HEAD(&td->trim_list);
1463         INIT_FLIST_HEAD(&td->next_rand_list);
1464         pthread_mutex_init(&td->io_u_lock, NULL);
1465         td->io_hist_tree = RB_ROOT;
1466
1467         pthread_condattr_init(&attr);
1468         pthread_cond_init(&td->verify_cond, &attr);
1469         pthread_cond_init(&td->free_cond, &attr);
1470
1471         td_set_runstate(td, TD_INITIALIZED);
1472         dprint(FD_MUTEX, "up startup_mutex\n");
1473         fio_mutex_up(startup_mutex);
1474         dprint(FD_MUTEX, "wait on td->mutex\n");
1475         fio_mutex_down(td->mutex);
1476         dprint(FD_MUTEX, "done waiting on td->mutex\n");
1477
1478         /*
1479          * A new gid requires privilege, so we need to do this before setting
1480          * the uid.
1481          */
1482         if (o->gid != -1U && setgid(o->gid)) {
1483                 td_verror(td, errno, "setgid");
1484                 goto err;
1485         }
1486         if (o->uid != -1U && setuid(o->uid)) {
1487                 td_verror(td, errno, "setuid");
1488                 goto err;
1489         }
1490
1491         /*
1492          * If we have a gettimeofday() thread, make sure we exclude that
1493          * thread from this job
1494          */
1495         if (o->gtod_cpu)
1496                 fio_cpu_clear(&o->cpumask, o->gtod_cpu);
1497
1498         /*
1499          * Set affinity first, in case it has an impact on the memory
1500          * allocations.
1501          */
1502         if (fio_option_is_set(o, cpumask)) {
1503                 if (o->cpus_allowed_policy == FIO_CPUS_SPLIT) {
1504                         ret = fio_cpus_split(&o->cpumask, td->thread_number - 1);
1505                         if (!ret) {
1506                                 log_err("fio: no CPUs set\n");
1507                                 log_err("fio: Try increasing number of available CPUs\n");
1508                                 td_verror(td, EINVAL, "cpus_split");
1509                                 goto err;
1510                         }
1511                 }
1512                 ret = fio_setaffinity(td->pid, o->cpumask);
1513                 if (ret == -1) {
1514                         td_verror(td, errno, "cpu_set_affinity");
1515                         goto err;
1516                 }
1517         }
1518
1519 #ifdef CONFIG_LIBNUMA
1520         /* numa node setup */
1521         if (fio_option_is_set(o, numa_cpunodes) ||
1522             fio_option_is_set(o, numa_memnodes)) {
1523                 struct bitmask *mask;
1524
1525                 if (numa_available() < 0) {
1526                         td_verror(td, errno, "Does not support NUMA API\n");
1527                         goto err;
1528                 }
1529
1530                 if (fio_option_is_set(o, numa_cpunodes)) {
1531                         mask = numa_parse_nodestring(o->numa_cpunodes);
1532                         ret = numa_run_on_node_mask(mask);
1533                         numa_free_nodemask(mask);
1534                         if (ret == -1) {
1535                                 td_verror(td, errno, \
1536                                         "numa_run_on_node_mask failed\n");
1537                                 goto err;
1538                         }
1539                 }
1540
1541                 if (fio_option_is_set(o, numa_memnodes)) {
1542                         mask = NULL;
1543                         if (o->numa_memnodes)
1544                                 mask = numa_parse_nodestring(o->numa_memnodes);
1545
1546                         switch (o->numa_mem_mode) {
1547                         case MPOL_INTERLEAVE:
1548                                 numa_set_interleave_mask(mask);
1549                                 break;
1550                         case MPOL_BIND:
1551                                 numa_set_membind(mask);
1552                                 break;
1553                         case MPOL_LOCAL:
1554                                 numa_set_localalloc();
1555                                 break;
1556                         case MPOL_PREFERRED:
1557                                 numa_set_preferred(o->numa_mem_prefer_node);
1558                                 break;
1559                         case MPOL_DEFAULT:
1560                         default:
1561                                 break;
1562                         }
1563
1564                         if (mask)
1565                                 numa_free_nodemask(mask);
1566
1567                 }
1568         }
1569 #endif
1570
1571         if (fio_pin_memory(td))
1572                 goto err;
1573
1574         /*
1575          * May alter parameters that init_io_u() will use, so we need to
1576          * do this first.
1577          */
1578         if (init_iolog(td))
1579                 goto err;
1580
1581         if (init_io_u(td))
1582                 goto err;
1583
1584         if (o->verify_async && verify_async_init(td))
1585                 goto err;
1586
1587         if (fio_option_is_set(o, ioprio) ||
1588             fio_option_is_set(o, ioprio_class)) {
1589                 ret = ioprio_set(IOPRIO_WHO_PROCESS, 0, o->ioprio_class, o->ioprio);
1590                 if (ret == -1) {
1591                         td_verror(td, errno, "ioprio_set");
1592                         goto err;
1593                 }
1594         }
1595
1596         if (o->cgroup && cgroup_setup(td, cgroup_list, &cgroup_mnt))
1597                 goto err;
1598
1599         errno = 0;
1600         if (nice(o->nice) == -1 && errno != 0) {
1601                 td_verror(td, errno, "nice");
1602                 goto err;
1603         }
1604
1605         if (o->ioscheduler && switch_ioscheduler(td))
1606                 goto err;
1607
1608         if (!o->create_serialize && setup_files(td))
1609                 goto err;
1610
1611         if (td_io_init(td))
1612                 goto err;
1613
1614         if (init_random_map(td))
1615                 goto err;
1616
1617         if (o->exec_prerun && exec_string(o, o->exec_prerun, (const char *)"prerun"))
1618                 goto err;
1619
1620         if (o->pre_read) {
1621                 if (pre_read_files(td) < 0)
1622                         goto err;
1623         }
1624
1625         if (td->flags & TD_F_COMPRESS_LOG)
1626                 tp_init(&td->tp_data);
1627
1628         fio_verify_init(td);
1629
1630         if ((o->io_submit_mode == IO_MODE_OFFLOAD) &&
1631             workqueue_init(td, &td->io_wq, &rated_wq_ops, td->o.iodepth))
1632                 goto err;
1633
1634         fio_gettime(&td->epoch, NULL);
1635         fio_getrusage(&td->ru_start);
1636         memcpy(&td->bw_sample_time, &td->epoch, sizeof(td->epoch));
1637         memcpy(&td->iops_sample_time, &td->epoch, sizeof(td->epoch));
1638
1639         if (o->ratemin[DDIR_READ] || o->ratemin[DDIR_WRITE] ||
1640                         o->ratemin[DDIR_TRIM]) {
1641                 memcpy(&td->lastrate[DDIR_READ], &td->bw_sample_time,
1642                                         sizeof(td->bw_sample_time));
1643                 memcpy(&td->lastrate[DDIR_WRITE], &td->bw_sample_time,
1644                                         sizeof(td->bw_sample_time));
1645                 memcpy(&td->lastrate[DDIR_TRIM], &td->bw_sample_time,
1646                                         sizeof(td->bw_sample_time));
1647         }
1648
1649         clear_state = 0;
1650         while (keep_running(td)) {
1651                 uint64_t verify_bytes;
1652
1653                 fio_gettime(&td->start, NULL);
1654                 memcpy(&td->tv_cache, &td->start, sizeof(td->start));
1655
1656                 if (clear_state)
1657                         clear_io_state(td, 0);
1658
1659                 prune_io_piece_log(td);
1660
1661                 if (td->o.verify_only && (td_write(td) || td_rw(td)))
1662                         verify_bytes = do_dry_run(td);
1663                 else
1664                         verify_bytes = do_io(td);
1665
1666                 clear_state = 1;
1667
1668                 /*
1669                  * Make sure we've successfully updated the rusage stats
1670                  * before waiting on the stat mutex. Otherwise we could have
1671                  * the stat thread holding stat mutex and waiting for
1672                  * the rusage_sem, which would never get upped because
1673                  * this thread is waiting for the stat mutex.
1674                  */
1675                 check_update_rusage(td);
1676
1677                 fio_mutex_down(stat_mutex);
1678                 if (td_read(td) && td->io_bytes[DDIR_READ])
1679                         update_runtime(td, elapsed_us, DDIR_READ);
1680                 if (td_write(td) && td->io_bytes[DDIR_WRITE])
1681                         update_runtime(td, elapsed_us, DDIR_WRITE);
1682                 if (td_trim(td) && td->io_bytes[DDIR_TRIM])
1683                         update_runtime(td, elapsed_us, DDIR_TRIM);
1684                 fio_gettime(&td->start, NULL);
1685                 fio_mutex_up(stat_mutex);
1686
1687                 if (td->error || td->terminate)
1688                         break;
1689
1690                 if (!o->do_verify ||
1691                     o->verify == VERIFY_NONE ||
1692                     (td->io_ops->flags & FIO_UNIDIR))
1693                         continue;
1694
1695                 clear_io_state(td, 0);
1696
1697                 fio_gettime(&td->start, NULL);
1698
1699                 do_verify(td, verify_bytes);
1700
1701                 /*
1702                  * See comment further up for why this is done here.
1703                  */
1704                 check_update_rusage(td);
1705
1706                 fio_mutex_down(stat_mutex);
1707                 update_runtime(td, elapsed_us, DDIR_READ);
1708                 fio_gettime(&td->start, NULL);
1709                 fio_mutex_up(stat_mutex);
1710
1711                 if (td->error || td->terminate)
1712                         break;
1713         }
1714
1715         update_rusage_stat(td);
1716         td->ts.total_run_time = mtime_since_now(&td->epoch);
1717         td->ts.io_bytes[DDIR_READ] = td->io_bytes[DDIR_READ];
1718         td->ts.io_bytes[DDIR_WRITE] = td->io_bytes[DDIR_WRITE];
1719         td->ts.io_bytes[DDIR_TRIM] = td->io_bytes[DDIR_TRIM];
1720
1721         if (td->o.verify_state_save && !(td->flags & TD_F_VSTATE_SAVED) &&
1722             (td->o.verify != VERIFY_NONE && td_write(td)))
1723                 verify_save_state(td->thread_number);
1724
1725         fio_unpin_memory(td);
1726
1727         fio_writeout_logs(td);
1728
1729         if (o->io_submit_mode == IO_MODE_OFFLOAD)
1730                 workqueue_exit(&td->io_wq);
1731
1732         if (td->flags & TD_F_COMPRESS_LOG)
1733                 tp_exit(&td->tp_data);
1734
1735         if (o->exec_postrun)
1736                 exec_string(o, o->exec_postrun, (const char *)"postrun");
1737
1738         if (exitall_on_terminate)
1739                 fio_terminate_threads(td->groupid);
1740
1741 err:
1742         if (td->error)
1743                 log_info("fio: pid=%d, err=%d/%s\n", (int) td->pid, td->error,
1744                                                         td->verror);
1745
1746         if (o->verify_async)
1747                 verify_async_exit(td);
1748
1749         close_and_free_files(td);
1750         cleanup_io_u(td);
1751         close_ioengine(td);
1752         cgroup_shutdown(td, &cgroup_mnt);
1753         verify_free_state(td);
1754
1755         if (fio_option_is_set(o, cpumask)) {
1756                 ret = fio_cpuset_exit(&o->cpumask);
1757                 if (ret)
1758                         td_verror(td, ret, "fio_cpuset_exit");
1759         }
1760
1761         /*
1762          * do this very late, it will log file closing as well
1763          */
1764         if (o->write_iolog_file)
1765                 write_iolog_close(td);
1766
1767         fio_mutex_remove(td->mutex);
1768         td->mutex = NULL;
1769
1770         td_set_runstate(td, TD_EXITED);
1771
1772         /*
1773          * Do this last after setting our runstate to exited, so we
1774          * know that the stat thread is signaled.
1775          */
1776         check_update_rusage(td);
1777
1778         return (void *) (uintptr_t) td->error;
1779 }
1780
1781
1782 /*
1783  * We cannot pass the td data into a forked process, so attach the td and
1784  * pass it to the thread worker.
1785  */
1786 static int fork_main(int shmid, int offset)
1787 {
1788         struct thread_data *td;
1789         void *data, *ret;
1790
1791 #if !defined(__hpux) && !defined(CONFIG_NO_SHM)
1792         data = shmat(shmid, NULL, 0);
1793         if (data == (void *) -1) {
1794                 int __err = errno;
1795
1796                 perror("shmat");
1797                 return __err;
1798         }
1799 #else
1800         /*
1801          * HP-UX inherits shm mappings?
1802          */
1803         data = threads;
1804 #endif
1805
1806         td = data + offset * sizeof(struct thread_data);
1807         ret = thread_main(td);
1808         shmdt(data);
1809         return (int) (uintptr_t) ret;
1810 }
1811
1812 static void dump_td_info(struct thread_data *td)
1813 {
1814         log_err("fio: job '%s' hasn't exited in %lu seconds, it appears to "
1815                 "be stuck. Doing forceful exit of this job.\n", td->o.name,
1816                         (unsigned long) time_since_now(&td->terminate_time));
1817 }
1818
1819 /*
1820  * Run over the job map and reap the threads that have exited, if any.
1821  */
1822 static void reap_threads(unsigned int *nr_running, unsigned int *t_rate,
1823                          unsigned int *m_rate)
1824 {
1825         struct thread_data *td;
1826         unsigned int cputhreads, realthreads, pending;
1827         int i, status, ret;
1828
1829         /*
1830          * reap exited threads (TD_EXITED -> TD_REAPED)
1831          */
1832         realthreads = pending = cputhreads = 0;
1833         for_each_td(td, i) {
1834                 int flags = 0;
1835
1836                 /*
1837                  * ->io_ops is NULL for a thread that has closed its
1838                  * io engine
1839                  */
1840                 if (td->io_ops && !strcmp(td->io_ops->name, "cpuio"))
1841                         cputhreads++;
1842                 else
1843                         realthreads++;
1844
1845                 if (!td->pid) {
1846                         pending++;
1847                         continue;
1848                 }
1849                 if (td->runstate == TD_REAPED)
1850                         continue;
1851                 if (td->o.use_thread) {
1852                         if (td->runstate == TD_EXITED) {
1853                                 td_set_runstate(td, TD_REAPED);
1854                                 goto reaped;
1855                         }
1856                         continue;
1857                 }
1858
1859                 flags = WNOHANG;
1860                 if (td->runstate == TD_EXITED)
1861                         flags = 0;
1862
1863                 /*
1864                  * check if someone quit or got killed in an unusual way
1865                  */
1866                 ret = waitpid(td->pid, &status, flags);
1867                 if (ret < 0) {
1868                         if (errno == ECHILD) {
1869                                 log_err("fio: pid=%d disappeared %d\n",
1870                                                 (int) td->pid, td->runstate);
1871                                 td->sig = ECHILD;
1872                                 td_set_runstate(td, TD_REAPED);
1873                                 goto reaped;
1874                         }
1875                         perror("waitpid");
1876                 } else if (ret == td->pid) {
1877                         if (WIFSIGNALED(status)) {
1878                                 int sig = WTERMSIG(status);
1879
1880                                 if (sig != SIGTERM && sig != SIGUSR2)
1881                                         log_err("fio: pid=%d, got signal=%d\n",
1882                                                         (int) td->pid, sig);
1883                                 td->sig = sig;
1884                                 td_set_runstate(td, TD_REAPED);
1885                                 goto reaped;
1886                         }
1887                         if (WIFEXITED(status)) {
1888                                 if (WEXITSTATUS(status) && !td->error)
1889                                         td->error = WEXITSTATUS(status);
1890
1891                                 td_set_runstate(td, TD_REAPED);
1892                                 goto reaped;
1893                         }
1894                 }
1895
1896                 /*
1897                  * If the job is stuck, do a forceful timeout of it and
1898                  * move on.
1899                  */
1900                 if (td->terminate &&
1901                     time_since_now(&td->terminate_time) >= FIO_REAP_TIMEOUT) {
1902                         dump_td_info(td);
1903                         td_set_runstate(td, TD_REAPED);
1904                         goto reaped;
1905                 }
1906
1907                 /*
1908                  * thread is not dead, continue
1909                  */
1910                 pending++;
1911                 continue;
1912 reaped:
1913                 (*nr_running)--;
1914                 (*m_rate) -= ddir_rw_sum(td->o.ratemin);
1915                 (*t_rate) -= ddir_rw_sum(td->o.rate);
1916                 if (!td->pid)
1917                         pending--;
1918
1919                 if (td->error)
1920                         exit_value++;
1921
1922                 done_secs += mtime_since_now(&td->epoch) / 1000;
1923                 profile_td_exit(td);
1924         }
1925
1926         if (*nr_running == cputhreads && !pending && realthreads)
1927                 fio_terminate_threads(TERMINATE_ALL);
1928 }
1929
1930 static bool __check_trigger_file(void)
1931 {
1932         struct stat sb;
1933
1934         if (!trigger_file)
1935                 return false;
1936
1937         if (stat(trigger_file, &sb))
1938                 return false;
1939
1940         if (unlink(trigger_file) < 0)
1941                 log_err("fio: failed to unlink %s: %s\n", trigger_file,
1942                                                         strerror(errno));
1943
1944         return true;
1945 }
1946
1947 static bool trigger_timedout(void)
1948 {
1949         if (trigger_timeout)
1950                 return time_since_genesis() >= trigger_timeout;
1951
1952         return false;
1953 }
1954
1955 void exec_trigger(const char *cmd)
1956 {
1957         int ret;
1958
1959         if (!cmd)
1960                 return;
1961
1962         ret = system(cmd);
1963         if (ret == -1)
1964                 log_err("fio: failed executing %s trigger\n", cmd);
1965 }
1966
1967 void check_trigger_file(void)
1968 {
1969         if (__check_trigger_file() || trigger_timedout()) {
1970                 if (nr_clients)
1971                         fio_clients_send_trigger(trigger_remote_cmd);
1972                 else {
1973                         verify_save_state(IO_LIST_ALL);
1974                         fio_terminate_threads(TERMINATE_ALL);
1975                         exec_trigger(trigger_cmd);
1976                 }
1977         }
1978 }
1979
1980 static int fio_verify_load_state(struct thread_data *td)
1981 {
1982         int ret;
1983
1984         if (!td->o.verify_state)
1985                 return 0;
1986
1987         if (is_backend) {
1988                 void *data;
1989                 int ver;
1990
1991                 ret = fio_server_get_verify_state(td->o.name,
1992                                         td->thread_number - 1, &data, &ver);
1993                 if (!ret)
1994                         verify_convert_assign_state(td, data, ver);
1995         } else
1996                 ret = verify_load_state(td, "local");
1997
1998         return ret;
1999 }
2000
2001 static void do_usleep(unsigned int usecs)
2002 {
2003         check_for_running_stats();
2004         check_trigger_file();
2005         usleep(usecs);
2006 }
2007
2008 static bool check_mount_writes(struct thread_data *td)
2009 {
2010         struct fio_file *f;
2011         unsigned int i;
2012
2013         if (!td_write(td) || td->o.allow_mounted_write)
2014                 return false;
2015
2016         for_each_file(td, f, i) {
2017                 if (f->filetype != FIO_TYPE_BD)
2018                         continue;
2019                 if (device_is_mounted(f->file_name))
2020                         goto mounted;
2021         }
2022
2023         return false;
2024 mounted:
2025         log_err("fio: %s appears mounted, and 'allow_mounted_write' isn't set. Aborting.", f->file_name);
2026         return true;
2027 }
2028
2029 /*
2030  * Main function for kicking off and reaping jobs, as needed.
2031  */
2032 static void run_threads(void)
2033 {
2034         struct thread_data *td;
2035         unsigned int i, todo, nr_running, m_rate, t_rate, nr_started;
2036         uint64_t spent;
2037
2038         if (fio_gtod_offload && fio_start_gtod_thread())
2039                 return;
2040
2041         fio_idle_prof_init();
2042
2043         set_sig_handlers();
2044
2045         nr_thread = nr_process = 0;
2046         for_each_td(td, i) {
2047                 if (check_mount_writes(td))
2048                         return;
2049                 if (td->o.use_thread)
2050                         nr_thread++;
2051                 else
2052                         nr_process++;
2053         }
2054
2055         if (output_format & FIO_OUTPUT_NORMAL) {
2056                 log_info("Starting ");
2057                 if (nr_thread)
2058                         log_info("%d thread%s", nr_thread,
2059                                                 nr_thread > 1 ? "s" : "");
2060                 if (nr_process) {
2061                         if (nr_thread)
2062                                 log_info(" and ");
2063                         log_info("%d process%s", nr_process,
2064                                                 nr_process > 1 ? "es" : "");
2065                 }
2066                 log_info("\n");
2067                 log_info_flush();
2068         }
2069
2070         todo = thread_number;
2071         nr_running = 0;
2072         nr_started = 0;
2073         m_rate = t_rate = 0;
2074
2075         for_each_td(td, i) {
2076                 print_status_init(td->thread_number - 1);
2077
2078                 if (!td->o.create_serialize)
2079                         continue;
2080
2081                 if (fio_verify_load_state(td))
2082                         goto reap;
2083
2084                 /*
2085                  * do file setup here so it happens sequentially,
2086                  * we don't want X number of threads getting their
2087                  * client data interspersed on disk
2088                  */
2089                 if (setup_files(td)) {
2090 reap:
2091                         exit_value++;
2092                         if (td->error)
2093                                 log_err("fio: pid=%d, err=%d/%s\n",
2094                                         (int) td->pid, td->error, td->verror);
2095                         td_set_runstate(td, TD_REAPED);
2096                         todo--;
2097                 } else {
2098                         struct fio_file *f;
2099                         unsigned int j;
2100
2101                         /*
2102                          * for sharing to work, each job must always open
2103                          * its own files. so close them, if we opened them
2104                          * for creation
2105                          */
2106                         for_each_file(td, f, j) {
2107                                 if (fio_file_open(f))
2108                                         td_io_close_file(td, f);
2109                         }
2110                 }
2111         }
2112
2113         /* start idle threads before io threads start to run */
2114         fio_idle_prof_start();
2115
2116         set_genesis_time();
2117
2118         while (todo) {
2119                 struct thread_data *map[REAL_MAX_JOBS];
2120                 struct timeval this_start;
2121                 int this_jobs = 0, left;
2122
2123                 /*
2124                  * create threads (TD_NOT_CREATED -> TD_CREATED)
2125                  */
2126                 for_each_td(td, i) {
2127                         if (td->runstate != TD_NOT_CREATED)
2128                                 continue;
2129
2130                         /*
2131                          * never got a chance to start, killed by other
2132                          * thread for some reason
2133                          */
2134                         if (td->terminate) {
2135                                 todo--;
2136                                 continue;
2137                         }
2138
2139                         if (td->o.start_delay) {
2140                                 spent = utime_since_genesis();
2141
2142                                 if (td->o.start_delay > spent)
2143                                         continue;
2144                         }
2145
2146                         if (td->o.stonewall && (nr_started || nr_running)) {
2147                                 dprint(FD_PROCESS, "%s: stonewall wait\n",
2148                                                         td->o.name);
2149                                 break;
2150                         }
2151
2152                         init_disk_util(td);
2153
2154                         td->rusage_sem = fio_mutex_init(FIO_MUTEX_LOCKED);
2155                         td->update_rusage = 0;
2156
2157                         /*
2158                          * Set state to created. Thread will transition
2159                          * to TD_INITIALIZED when it's done setting up.
2160                          */
2161                         td_set_runstate(td, TD_CREATED);
2162                         map[this_jobs++] = td;
2163                         nr_started++;
2164
2165                         if (td->o.use_thread) {
2166                                 int ret;
2167
2168                                 dprint(FD_PROCESS, "will pthread_create\n");
2169                                 ret = pthread_create(&td->thread, NULL,
2170                                                         thread_main, td);
2171                                 if (ret) {
2172                                         log_err("pthread_create: %s\n",
2173                                                         strerror(ret));
2174                                         nr_started--;
2175                                         break;
2176                                 }
2177                                 ret = pthread_detach(td->thread);
2178                                 if (ret)
2179                                         log_err("pthread_detach: %s",
2180                                                         strerror(ret));
2181                         } else {
2182                                 pid_t pid;
2183                                 dprint(FD_PROCESS, "will fork\n");
2184                                 pid = fork();
2185                                 if (!pid) {
2186                                         int ret = fork_main(shm_id, i);
2187
2188                                         _exit(ret);
2189                                 } else if (i == fio_debug_jobno)
2190                                         *fio_debug_jobp = pid;
2191                         }
2192                         dprint(FD_MUTEX, "wait on startup_mutex\n");
2193                         if (fio_mutex_down_timeout(startup_mutex, 10)) {
2194                                 log_err("fio: job startup hung? exiting.\n");
2195                                 fio_terminate_threads(TERMINATE_ALL);
2196                                 fio_abort = 1;
2197                                 nr_started--;
2198                                 break;
2199                         }
2200                         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
2201                 }
2202
2203                 /*
2204                  * Wait for the started threads to transition to
2205                  * TD_INITIALIZED.
2206                  */
2207                 fio_gettime(&this_start, NULL);
2208                 left = this_jobs;
2209                 while (left && !fio_abort) {
2210                         if (mtime_since_now(&this_start) > JOB_START_TIMEOUT)
2211                                 break;
2212
2213                         do_usleep(100000);
2214
2215                         for (i = 0; i < this_jobs; i++) {
2216                                 td = map[i];
2217                                 if (!td)
2218                                         continue;
2219                                 if (td->runstate == TD_INITIALIZED) {
2220                                         map[i] = NULL;
2221                                         left--;
2222                                 } else if (td->runstate >= TD_EXITED) {
2223                                         map[i] = NULL;
2224                                         left--;
2225                                         todo--;
2226                                         nr_running++; /* work-around... */
2227                                 }
2228                         }
2229                 }
2230
2231                 if (left) {
2232                         log_err("fio: %d job%s failed to start\n", left,
2233                                         left > 1 ? "s" : "");
2234                         for (i = 0; i < this_jobs; i++) {
2235                                 td = map[i];
2236                                 if (!td)
2237                                         continue;
2238                                 kill(td->pid, SIGTERM);
2239                         }
2240                         break;
2241                 }
2242
2243                 /*
2244                  * start created threads (TD_INITIALIZED -> TD_RUNNING).
2245                  */
2246                 for_each_td(td, i) {
2247                         if (td->runstate != TD_INITIALIZED)
2248                                 continue;
2249
2250                         if (in_ramp_time(td))
2251                                 td_set_runstate(td, TD_RAMP);
2252                         else
2253                                 td_set_runstate(td, TD_RUNNING);
2254                         nr_running++;
2255                         nr_started--;
2256                         m_rate += ddir_rw_sum(td->o.ratemin);
2257                         t_rate += ddir_rw_sum(td->o.rate);
2258                         todo--;
2259                         fio_mutex_up(td->mutex);
2260                 }
2261
2262                 reap_threads(&nr_running, &t_rate, &m_rate);
2263
2264                 if (todo)
2265                         do_usleep(100000);
2266         }
2267
2268         while (nr_running) {
2269                 reap_threads(&nr_running, &t_rate, &m_rate);
2270                 do_usleep(10000);
2271         }
2272
2273         fio_idle_prof_stop();
2274
2275         update_io_ticks();
2276 }
2277
2278 static void wait_for_helper_thread_exit(void)
2279 {
2280         void *ret;
2281
2282         helper_exit = 1;
2283         pthread_cond_signal(&helper_cond);
2284         pthread_join(helper_thread, &ret);
2285 }
2286
2287 static void free_disk_util(void)
2288 {
2289         disk_util_prune_entries();
2290
2291         pthread_cond_destroy(&helper_cond);
2292 }
2293
2294 static void *helper_thread_main(void *data)
2295 {
2296         int ret = 0;
2297
2298         fio_mutex_up(startup_mutex);
2299
2300         while (!ret) {
2301                 uint64_t sec = DISK_UTIL_MSEC / 1000;
2302                 uint64_t nsec = (DISK_UTIL_MSEC % 1000) * 1000000;
2303                 struct timespec ts;
2304                 struct timeval tv;
2305
2306                 gettimeofday(&tv, NULL);
2307                 ts.tv_sec = tv.tv_sec + sec;
2308                 ts.tv_nsec = (tv.tv_usec * 1000) + nsec;
2309
2310                 if (ts.tv_nsec >= 1000000000ULL) {
2311                         ts.tv_nsec -= 1000000000ULL;
2312                         ts.tv_sec++;
2313                 }
2314
2315                 pthread_cond_timedwait(&helper_cond, &helper_lock, &ts);
2316
2317                 ret = update_io_ticks();
2318
2319                 if (helper_do_stat) {
2320                         helper_do_stat = 0;
2321                         __show_running_run_stats();
2322                 }
2323
2324                 if (!is_backend)
2325                         print_thread_status();
2326         }
2327
2328         return NULL;
2329 }
2330
2331 static int create_helper_thread(void)
2332 {
2333         int ret;
2334
2335         setup_disk_util();
2336
2337         pthread_cond_init(&helper_cond, NULL);
2338         pthread_mutex_init(&helper_lock, NULL);
2339
2340         ret = pthread_create(&helper_thread, NULL, helper_thread_main, NULL);
2341         if (ret) {
2342                 log_err("Can't create helper thread: %s\n", strerror(ret));
2343                 return 1;
2344         }
2345
2346         dprint(FD_MUTEX, "wait on startup_mutex\n");
2347         fio_mutex_down(startup_mutex);
2348         dprint(FD_MUTEX, "done waiting on startup_mutex\n");
2349         return 0;
2350 }
2351
2352 int fio_backend(void)
2353 {
2354         struct thread_data *td;
2355         int i;
2356
2357         if (exec_profile) {
2358                 if (load_profile(exec_profile))
2359                         return 1;
2360                 free(exec_profile);
2361                 exec_profile = NULL;
2362         }
2363         if (!thread_number)
2364                 return 0;
2365
2366         if (write_bw_log) {
2367                 struct log_params p = {
2368                         .log_type = IO_LOG_TYPE_BW,
2369                 };
2370
2371                 setup_log(&agg_io_log[DDIR_READ], &p, "agg-read_bw.log");
2372                 setup_log(&agg_io_log[DDIR_WRITE], &p, "agg-write_bw.log");
2373                 setup_log(&agg_io_log[DDIR_TRIM], &p, "agg-trim_bw.log");
2374         }
2375
2376         startup_mutex = fio_mutex_init(FIO_MUTEX_LOCKED);
2377         if (startup_mutex == NULL)
2378                 return 1;
2379
2380         set_genesis_time();
2381         stat_init();
2382         create_helper_thread();
2383
2384         cgroup_list = smalloc(sizeof(*cgroup_list));
2385         INIT_FLIST_HEAD(cgroup_list);
2386
2387         run_threads();
2388
2389         wait_for_helper_thread_exit();
2390
2391         if (!fio_abort) {
2392                 __show_run_stats();
2393                 if (write_bw_log) {
2394                         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
2395                                 struct io_log *log = agg_io_log[i];
2396
2397                                 flush_log(log, 0);
2398                                 free_log(log);
2399                         }
2400                 }
2401         }
2402
2403         for_each_td(td, i) {
2404                 fio_options_free(td);
2405                 if (td->rusage_sem) {
2406                         fio_mutex_remove(td->rusage_sem);
2407                         td->rusage_sem = NULL;
2408                 }
2409         }
2410
2411         free_disk_util();
2412         cgroup_kill(cgroup_list);
2413         sfree(cgroup_list);
2414         sfree(cgroup_mnt);
2415
2416         fio_mutex_remove(startup_mutex);
2417         stat_exit();
2418         return exit_value;
2419 }