iolog.c

   1 /*
   2  * Code related to writing an iolog of what a thread is doing, and to
   3  * later read that back and replay
   4  */
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <libgen.h>
   8 #include <assert.h>
   9 #include <sys/types.h>
  10 #include <sys/stat.h>
  11 #include <unistd.h>
  12 #ifdef CONFIG_ZLIB
  13 #include <zlib.h>
  14 #endif
  15
  16 #include "flist.h"
  17 #include "fio.h"
  18 #include "verify.h"
  19 #include "trim.h"
  20 #include "filelock.h"
  21 #include "smalloc.h"
  22
  23 static int iolog_flush(struct io_log *log);
  24
  25 static const char iolog_ver2[] = "fio version 2 iolog";
  26
  27 void queue_io_piece(struct thread_data *td, struct io_piece *ipo)
  28 {
  29         flist_add_tail(&ipo->list, &td->io_log_list);
  30         td->total_io_size += ipo->len;
  31 }
  32
  33 void log_io_u(const struct thread_data *td, const struct io_u *io_u)
  34 {
  35         if (!td->o.write_iolog_file)
  36                 return;
  37
  38         fprintf(td->iolog_f, "%s %s %llu %lu\n", io_u->file->file_name,
  39                                                 io_ddir_name(io_u->ddir),
  40                                                 io_u->offset, io_u->buflen);
  41 }
  42
  43 void log_file(struct thread_data *td, struct fio_file *f,
  44               enum file_log_act what)
  45 {
  46         const char *act[] = { "add", "open", "close" };
  47
  48         assert(what < 3);
  49
  50         if (!td->o.write_iolog_file)
  51                 return;
  52
  53
  54         /*
  55          * this happens on the pre-open/close done before the job starts
  56          */
  57         if (!td->iolog_f)
  58                 return;
  59
  60         fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
  61 }
  62
  63 static void iolog_delay(struct thread_data *td, unsigned long delay)
  64 {
  65         uint64_t usec = utime_since_now(&td->last_issue);
  66         uint64_t this_delay;
  67         struct timeval tv;
  68
  69         if (delay < td->time_offset) {
  70                 td->time_offset = 0;
  71                 return;
  72         }
  73
  74         delay -= td->time_offset;
  75         if (delay < usec)
  76                 return;
  77
  78         delay -= usec;
  79
  80         fio_gettime(&tv, NULL);
  81         while (delay && !td->terminate) {
  82                 this_delay = delay;
  83                 if (this_delay > 500000)
  84                         this_delay = 500000;
  85
  86                 usec_sleep(td, this_delay);
  87                 delay -= this_delay;
  88         }
  89
  90         usec = utime_since_now(&tv);
  91         if (usec > delay)
  92                 td->time_offset = usec - delay;
  93         else
  94                 td->time_offset = 0;
  95 }
  96
  97 static int ipo_special(struct thread_data *td, struct io_piece *ipo)
  98 {
  99         struct fio_file *f;
 100         int ret;
 101
 102         /*
 103          * Not a special ipo
 104          */
 105         if (ipo->ddir != DDIR_INVAL)
 106                 return 0;
 107
 108         f = td->files[ipo->fileno];
 109
 110         switch (ipo->file_action) {
 111         case FIO_LOG_OPEN_FILE:
 112                 ret = td_io_open_file(td, f);
 113                 if (!ret)
 114                         break;
 115                 td_verror(td, ret, "iolog open file");
 116                 return -1;
 117         case FIO_LOG_CLOSE_FILE:
 118                 td_io_close_file(td, f);
 119                 break;
 120         case FIO_LOG_UNLINK_FILE:
 121                 td_io_unlink_file(td, f);
 122                 break;
 123         default:
 124                 log_err("fio: bad file action %d\n", ipo->file_action);
 125                 break;
 126         }
 127
 128         return 1;
 129 }
 130
 131 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
 132 {
 133         struct io_piece *ipo;
 134         unsigned long elapsed;
 135
 136         while (!flist_empty(&td->io_log_list)) {
 137                 int ret;
 138
 139                 ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
 140                 flist_del(&ipo->list);
 141                 remove_trim_entry(td, ipo);
 142
 143                 ret = ipo_special(td, ipo);
 144                 if (ret < 0) {
 145                         free(ipo);
 146                         break;
 147                 } else if (ret > 0) {
 148                         free(ipo);
 149                         continue;
 150                 }
 151
 152                 io_u->ddir = ipo->ddir;
 153                 if (ipo->ddir != DDIR_WAIT) {
 154                         io_u->offset = ipo->offset;
 155                         io_u->buflen = ipo->len;
 156                         io_u->file = td->files[ipo->fileno];
 157                         get_file(io_u->file);
 158                         dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
 159                                                 io_u->buflen, io_u->file->file_name);
 160                         if (ipo->delay)
 161                                 iolog_delay(td, ipo->delay);
 162                 } else {
 163                         elapsed = mtime_since_genesis();
 164                         if (ipo->delay > elapsed)
 165                                 usec_sleep(td, (ipo->delay - elapsed) * 1000);
 166                 }
 167
 168                 free(ipo);
 169
 170                 if (io_u->ddir != DDIR_WAIT)
 171                         return 0;
 172         }
 173
 174         td->done = 1;
 175         return 1;
 176 }
 177
 178 void prune_io_piece_log(struct thread_data *td)
 179 {
 180         struct io_piece *ipo;
 181         struct rb_node *n;
 182
 183         while ((n = rb_first(&td->io_hist_tree)) != NULL) {
 184                 ipo = rb_entry(n, struct io_piece, rb_node);
 185                 rb_erase(n, &td->io_hist_tree);
 186                 remove_trim_entry(td, ipo);
 187                 td->io_hist_len--;
 188                 free(ipo);
 189         }
 190
 191         while (!flist_empty(&td->io_hist_list)) {
 192                 ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
 193                 flist_del(&ipo->list);
 194                 remove_trim_entry(td, ipo);
 195                 td->io_hist_len--;
 196                 free(ipo);
 197         }
 198 }
 199
 200 /*
 201  * log a successful write, so we can unwind the log for verify
 202  */
 203 void log_io_piece(struct thread_data *td, struct io_u *io_u)
 204 {
 205         struct rb_node **p, *parent;
 206         struct io_piece *ipo, *__ipo;
 207
 208         ipo = malloc(sizeof(struct io_piece));
 209         init_ipo(ipo);
 210         ipo->file = io_u->file;
 211         ipo->offset = io_u->offset;
 212         ipo->len = io_u->buflen;
 213         ipo->numberio = io_u->numberio;
 214         ipo->flags = IP_F_IN_FLIGHT;
 215
 216         io_u->ipo = ipo;
 217
 218         if (io_u_should_trim(td, io_u)) {
 219                 flist_add_tail(&ipo->trim_list, &td->trim_list);
 220                 td->trim_entries++;
 221         }
 222
 223         /*
 224          * We don't need to sort the entries, if:
 225          *
 226          *      Sequential writes, or
 227          *      Random writes that lay out the file as it goes along
 228          *
 229          * For both these cases, just reading back data in the order we
 230          * wrote it out is the fastest.
 231          *
 232          * One exception is if we don't have a random map AND we are doing
 233          * verifies, in that case we need to check for duplicate blocks and
 234          * drop the old one, which we rely on the rb insert/lookup for
 235          * handling.
 236          */
 237         if (((!td->o.verifysort) || !td_random(td) || !td->o.overwrite) &&
 238               (file_randommap(td, ipo->file) || td->o.verify == VERIFY_NONE)) {
 239                 INIT_FLIST_HEAD(&ipo->list);
 240                 flist_add_tail(&ipo->list, &td->io_hist_list);
 241                 ipo->flags |= IP_F_ONLIST;
 242                 td->io_hist_len++;
 243                 return;
 244         }
 245
 246         RB_CLEAR_NODE(&ipo->rb_node);
 247
 248         /*
 249          * Sort the entry into the verification list
 250          */
 251 restart:
 252         p = &td->io_hist_tree.rb_node;
 253         parent = NULL;
 254         while (*p) {
 255                 int overlap = 0;
 256                 parent = *p;
 257
 258                 __ipo = rb_entry(parent, struct io_piece, rb_node);
 259                 if (ipo->file < __ipo->file)
 260                         p = &(*p)->rb_left;
 261                 else if (ipo->file > __ipo->file)
 262                         p = &(*p)->rb_right;
 263                 else if (ipo->offset < __ipo->offset) {
 264                         p = &(*p)->rb_left;
 265                         overlap = ipo->offset + ipo->len > __ipo->offset;
 266                 }
 267                 else if (ipo->offset > __ipo->offset) {
 268                         p = &(*p)->rb_right;
 269                         overlap = __ipo->offset + __ipo->len > ipo->offset;
 270                 }
 271                 else
 272                         overlap = 1;
 273
 274                 if (overlap) {
 275                         dprint(FD_IO, "iolog: overlap %llu/%lu, %llu/%lu",
 276                                 __ipo->offset, __ipo->len,
 277                                 ipo->offset, ipo->len);
 278                         td->io_hist_len--;
 279                         rb_erase(parent, &td->io_hist_tree);
 280                         remove_trim_entry(td, __ipo);
 281                         free(__ipo);
 282                         goto restart;
 283                 }
 284         }
 285
 286         rb_link_node(&ipo->rb_node, parent, p);
 287         rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
 288         ipo->flags |= IP_F_ONRB;
 289         td->io_hist_len++;
 290 }
 291
 292 void unlog_io_piece(struct thread_data *td, struct io_u *io_u)
 293 {
 294         struct io_piece *ipo = io_u->ipo;
 295
 296         if (td->ts.nr_block_infos) {
 297                 uint32_t *info = io_u_block_info(td, io_u);
 298                 if (BLOCK_INFO_STATE(*info) < BLOCK_STATE_TRIM_FAILURE) {
 299                         if (io_u->ddir == DDIR_TRIM)
 300                                 *info = BLOCK_INFO_SET_STATE(*info,
 301                                                 BLOCK_STATE_TRIM_FAILURE);
 302                         else if (io_u->ddir == DDIR_WRITE)
 303                                 *info = BLOCK_INFO_SET_STATE(*info,
 304                                                 BLOCK_STATE_WRITE_FAILURE);
 305                 }
 306         }
 307
 308         if (!ipo)
 309                 return;
 310
 311         if (ipo->flags & IP_F_ONRB)
 312                 rb_erase(&ipo->rb_node, &td->io_hist_tree);
 313         else if (ipo->flags & IP_F_ONLIST)
 314                 flist_del(&ipo->list);
 315
 316         free(ipo);
 317         io_u->ipo = NULL;
 318         td->io_hist_len--;
 319 }
 320
 321 void trim_io_piece(struct thread_data *td, const struct io_u *io_u)
 322 {
 323         struct io_piece *ipo = io_u->ipo;
 324
 325         if (!ipo)
 326                 return;
 327
 328         ipo->len = io_u->xfer_buflen - io_u->resid;
 329 }
 330
 331 void write_iolog_close(struct thread_data *td)
 332 {
 333         fflush(td->iolog_f);
 334         fclose(td->iolog_f);
 335         free(td->iolog_buf);
 336         td->iolog_f = NULL;
 337         td->iolog_buf = NULL;
 338 }
 339
 340 /*
 341  * Read version 2 iolog data. It is enhanced to include per-file logging,
 342  * syncs, etc.
 343  */
 344 static int read_iolog2(struct thread_data *td, FILE *f)
 345 {
 346         unsigned long long offset;
 347         unsigned int bytes;
 348         int reads, writes, waits, fileno = 0, file_action = 0; /* stupid gcc */
 349         char *fname, *act;
 350         char *str, *p;
 351         enum fio_ddir rw;
 352
 353         free_release_files(td);
 354
 355         /*
 356          * Read in the read iolog and store it, reuse the infrastructure
 357          * for doing verifications.
 358          */
 359         str = malloc(4096);
 360         fname = malloc(256+16);
 361         act = malloc(256+16);
 362
 363         reads = writes = waits = 0;
 364         while ((p = fgets(str, 4096, f)) != NULL) {
 365                 struct io_piece *ipo;
 366                 int r;
 367
 368                 r = sscanf(p, "%256s %256s %llu %u", fname, act, &offset,
 369                                                                         &bytes);
 370                 if (r == 4) {
 371                         /*
 372                          * Check action first
 373                          */
 374                         if (!strcmp(act, "wait"))
 375                                 rw = DDIR_WAIT;
 376                         else if (!strcmp(act, "read"))
 377                                 rw = DDIR_READ;
 378                         else if (!strcmp(act, "write"))
 379                                 rw = DDIR_WRITE;
 380                         else if (!strcmp(act, "sync"))
 381                                 rw = DDIR_SYNC;
 382                         else if (!strcmp(act, "datasync"))
 383                                 rw = DDIR_DATASYNC;
 384                         else if (!strcmp(act, "trim"))
 385                                 rw = DDIR_TRIM;
 386                         else {
 387                                 log_err("fio: bad iolog file action: %s\n",
 388                                                                         act);
 389                                 continue;
 390                         }
 391                         fileno = get_fileno(td, fname);
 392                 } else if (r == 2) {
 393                         rw = DDIR_INVAL;
 394                         if (!strcmp(act, "add")) {
 395                                 fileno = add_file(td, fname, 0, 1);
 396                                 file_action = FIO_LOG_ADD_FILE;
 397                                 continue;
 398                         } else if (!strcmp(act, "open")) {
 399                                 fileno = get_fileno(td, fname);
 400                                 file_action = FIO_LOG_OPEN_FILE;
 401                         } else if (!strcmp(act, "close")) {
 402                                 fileno = get_fileno(td, fname);
 403                                 file_action = FIO_LOG_CLOSE_FILE;
 404                         } else {
 405                                 log_err("fio: bad iolog file action: %s\n",
 406                                                                         act);
 407                                 continue;
 408                         }
 409                 } else {
 410                         log_err("bad iolog2: %s", p);
 411                         continue;
 412                 }
 413
 414                 if (rw == DDIR_READ)
 415                         reads++;
 416                 else if (rw == DDIR_WRITE) {
 417                         /*
 418                          * Don't add a write for ro mode
 419                          */
 420                         if (read_only)
 421                                 continue;
 422                         writes++;
 423                 } else if (rw == DDIR_WAIT) {
 424                         waits++;
 425                 } else if (rw == DDIR_INVAL) {
 426                 } else if (!ddir_sync(rw)) {
 427                         log_err("bad ddir: %d\n", rw);
 428                         continue;
 429                 }
 430
 431                 /*
 432                  * Make note of file
 433                  */
 434                 ipo = malloc(sizeof(*ipo));
 435                 init_ipo(ipo);
 436                 ipo->ddir = rw;
 437                 if (rw == DDIR_WAIT) {
 438                         ipo->delay = offset;
 439                 } else {
 440                         ipo->offset = offset;
 441                         ipo->len = bytes;
 442                         if (rw != DDIR_INVAL && bytes > td->o.max_bs[rw])
 443                                 td->o.max_bs[rw] = bytes;
 444                         ipo->fileno = fileno;
 445                         ipo->file_action = file_action;
 446                         td->o.size += bytes;
 447                 }
 448
 449                 queue_io_piece(td, ipo);
 450         }
 451
 452         free(str);
 453         free(act);
 454         free(fname);
 455
 456         if (writes && read_only) {
 457                 log_err("fio: <%s> skips replay of %d writes due to"
 458                         " read-only\n", td->o.name, writes);
 459                 writes = 0;
 460         }
 461
 462         if (!reads && !writes && !waits)
 463                 return 1;
 464         else if (reads && !writes)
 465                 td->o.td_ddir = TD_DDIR_READ;
 466         else if (!reads && writes)
 467                 td->o.td_ddir = TD_DDIR_WRITE;
 468         else
 469                 td->o.td_ddir = TD_DDIR_RW;
 470
 471         return 0;
 472 }
 473
 474 /*
 475  * open iolog, check version, and call appropriate parser
 476  */
 477 static int init_iolog_read(struct thread_data *td)
 478 {
 479         char buffer[256], *p;
 480         FILE *f;
 481         int ret;
 482
 483         f = fopen(td->o.read_iolog_file, "r");
 484         if (!f) {
 485                 perror("fopen read iolog");
 486                 return 1;
 487         }
 488
 489         p = fgets(buffer, sizeof(buffer), f);
 490         if (!p) {
 491                 td_verror(td, errno, "iolog read");
 492                 log_err("fio: unable to read iolog\n");
 493                 fclose(f);
 494                 return 1;
 495         }
 496
 497         /*
 498          * version 2 of the iolog stores a specific string as the
 499          * first line, check for that
 500          */
 501         if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
 502                 ret = read_iolog2(td, f);
 503         else {
 504                 log_err("fio: iolog version 1 is no longer supported\n");
 505                 ret = 1;
 506         }
 507
 508         fclose(f);
 509         return ret;
 510 }
 511
 512 /*
 513  * Set up a log for storing io patterns.
 514  */
 515 static int init_iolog_write(struct thread_data *td)
 516 {
 517         struct fio_file *ff;
 518         FILE *f;
 519         unsigned int i;
 520
 521         f = fopen(td->o.write_iolog_file, "a");
 522         if (!f) {
 523                 perror("fopen write iolog");
 524                 return 1;
 525         }
 526
 527         /*
 528          * That's it for writing, setup a log buffer and we're done.
 529           */
 530         td->iolog_f = f;
 531         td->iolog_buf = malloc(8192);
 532         setvbuf(f, td->iolog_buf, _IOFBF, 8192);
 533
 534         /*
 535          * write our version line
 536          */
 537         if (fprintf(f, "%s\n", iolog_ver2) < 0) {
 538                 perror("iolog init\n");
 539                 return 1;
 540         }
 541
 542         /*
 543          * add all known files
 544          */
 545         for_each_file(td, ff, i)
 546                 log_file(td, ff, FIO_LOG_ADD_FILE);
 547
 548         return 0;
 549 }
 550
 551 int init_iolog(struct thread_data *td)
 552 {
 553         int ret = 0;
 554
 555         if (td->o.read_iolog_file) {
 556                 int need_swap;
 557
 558                 /*
 559                  * Check if it's a blktrace file and load that if possible.
 560                  * Otherwise assume it's a normal log file and load that.
 561                  */
 562                 if (is_blktrace(td->o.read_iolog_file, &need_swap))
 563                         ret = load_blktrace(td, td->o.read_iolog_file, need_swap);
 564                 else
 565                         ret = init_iolog_read(td);
 566         } else if (td->o.write_iolog_file)
 567                 ret = init_iolog_write(td);
 568
 569         if (ret)
 570                 td_verror(td, EINVAL, "failed initializing iolog");
 571
 572         return ret;
 573 }
 574
 575 void setup_log(struct io_log **log, struct log_params *p,
 576                const char *filename)
 577 {
 578         struct io_log *l;
 579         int i;
 580         struct io_u_plat_entry *entry;
 581         struct flist_head *list;
 582
 583         l = scalloc(1, sizeof(*l));
 584         INIT_FLIST_HEAD(&l->io_logs);
 585         l->log_type = p->log_type;
 586         l->log_offset = p->log_offset;
 587         l->log_gz = p->log_gz;
 588         l->log_gz_store = p->log_gz_store;
 589         l->avg_msec = p->avg_msec;
 590         l->hist_msec = p->hist_msec;
 591         l->hist_coarseness = p->hist_coarseness;
 592         l->filename = strdup(filename);
 593         l->td = p->td;
 594
 595         /* Initialize histogram lists for each r/w direction,
 596          * with initial io_u_plat of all zeros:
 597          */
 598         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 599                 list = &l->hist_window[i].list.list;
 600                 INIT_FLIST_HEAD(list);
 601                 entry = calloc(1, sizeof(struct io_u_plat_entry));
 602                 flist_add(&entry->list, list);
 603         }
 604
 605         if (l->td && l->td->o.io_submit_mode != IO_MODE_OFFLOAD) {
 606                 struct io_logs *p;
 607
 608                 p = calloc(1, sizeof(*l->pending));
 609                 p->max_samples = DEF_LOG_ENTRIES;
 610                 p->log = calloc(p->max_samples, log_entry_sz(l));
 611                 l->pending = p;
 612         }
 613
 614         if (l->log_offset)
 615                 l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
 616
 617         INIT_FLIST_HEAD(&l->chunk_list);
 618
 619         if (l->log_gz && !p->td)
 620                 l->log_gz = 0;
 621         else if (l->log_gz || l->log_gz_store) {
 622                 mutex_init_pshared(&l->chunk_lock);
 623                 p->td->flags |= TD_F_COMPRESS_LOG;
 624         }
 625
 626         *log = l;
 627 }
 628
 629 #ifdef CONFIG_SETVBUF
 630 static void *set_file_buffer(FILE *f)
 631 {
 632         size_t size = 1048576;
 633         void *buf;
 634
 635         buf = malloc(size);
 636         setvbuf(f, buf, _IOFBF, size);
 637         return buf;
 638 }
 639
 640 static void clear_file_buffer(void *buf)
 641 {
 642         free(buf);
 643 }
 644 #else
 645 static void *set_file_buffer(FILE *f)
 646 {
 647         return NULL;
 648 }
 649
 650 static void clear_file_buffer(void *buf)
 651 {
 652 }
 653 #endif
 654
 655 void free_log(struct io_log *log)
 656 {
 657         while (!flist_empty(&log->io_logs)) {
 658                 struct io_logs *cur_log;
 659
 660                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
 661                 flist_del_init(&cur_log->list);
 662                 free(cur_log->log);
 663                 sfree(cur_log);
 664         }
 665
 666         if (log->pending) {
 667                 free(log->pending->log);
 668                 free(log->pending);
 669                 log->pending = NULL;
 670         }
 671
 672         free(log->pending);
 673         free(log->filename);
 674         sfree(log);
 675 }
 676
 677 static inline unsigned long hist_sum(int j, int stride, unsigned int *io_u_plat,
 678                 unsigned int *io_u_plat_last)
 679 {
 680         unsigned long sum;
 681         int k;
 682
 683         for (k = sum = 0; k < stride; k++)
 684                 sum += io_u_plat[j + k] - io_u_plat_last[j + k];
 685
 686         return sum;
 687 }
 688
 689 void flush_hist_samples(FILE *f, int hist_coarseness, void *samples,
 690                         uint64_t sample_size)
 691 {
 692         struct io_sample *s;
 693         int log_offset;
 694         uint64_t i, j, nr_samples;
 695         struct io_u_plat_entry *entry, *entry_before;
 696         unsigned int *io_u_plat;
 697         unsigned int *io_u_plat_before;
 698
 699         int stride = 1 << hist_coarseness;
 700
 701         if (!sample_size)
 702                 return;
 703
 704         s = __get_sample(samples, 0, 0);
 705         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 706
 707         nr_samples = sample_size / __log_entry_sz(log_offset);
 708
 709         for (i = 0; i < nr_samples; i++) {
 710                 s = __get_sample(samples, log_offset, i);
 711
 712                 entry = (struct io_u_plat_entry *) s->val;
 713                 io_u_plat = entry->io_u_plat;
 714
 715                 entry_before = flist_first_entry(&entry->list, struct io_u_plat_entry, list);
 716                 io_u_plat_before = entry_before->io_u_plat;
 717
 718                 fprintf(f, "%lu, %u, %u, ", (unsigned long)s->time,
 719                         io_sample_ddir(s), s->bs);
 720                 for (j = 0; j < FIO_IO_U_PLAT_NR - stride; j += stride) {
 721                         fprintf(f, "%lu, ", hist_sum(j, stride, io_u_plat, io_u_plat_before));
 722                 }
 723                 fprintf(f, "%lu\n", (unsigned long)
 724                         hist_sum(FIO_IO_U_PLAT_NR - stride, stride, io_u_plat,
 725                                  io_u_plat_before));
 726
 727                 flist_del(&entry_before->list);
 728                 free(entry_before);
 729         }
 730 }
 731
 732 void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 733 {
 734         struct io_sample *s;
 735         int log_offset;
 736         uint64_t i, nr_samples;
 737
 738         if (!sample_size)
 739                 return;
 740
 741         s = __get_sample(samples, 0, 0);
 742         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 743
 744         nr_samples = sample_size / __log_entry_sz(log_offset);
 745
 746         for (i = 0; i < nr_samples; i++) {
 747                 s = __get_sample(samples, log_offset, i);
 748
 749                 if (!log_offset) {
 750                         fprintf(f, "%lu, %lu, %u, %u\n",
 751                                         (unsigned long) s->time,
 752                                         (unsigned long) s->val,
 753                                         io_sample_ddir(s), s->bs);
 754                 } else {
 755                         struct io_sample_offset *so = (void *) s;
 756
 757                         fprintf(f, "%lu, %lu, %u, %u, %llu\n",
 758                                         (unsigned long) s->time,
 759                                         (unsigned long) s->val,
 760                                         io_sample_ddir(s), s->bs,
 761                                         (unsigned long long) so->offset);
 762                 }
 763         }
 764 }
 765
 766 #ifdef CONFIG_ZLIB
 767
 768 struct iolog_flush_data {
 769         struct workqueue_work work;
 770         struct io_log *log;
 771         void *samples;
 772         uint32_t nr_samples;
 773         bool free;
 774 };
 775
 776 #define GZ_CHUNK        131072
 777
 778 static struct iolog_compress *get_new_chunk(unsigned int seq)
 779 {
 780         struct iolog_compress *c;
 781
 782         c = malloc(sizeof(*c));
 783         INIT_FLIST_HEAD(&c->list);
 784         c->buf = malloc(GZ_CHUNK);
 785         c->len = 0;
 786         c->seq = seq;
 787         return c;
 788 }
 789
 790 static void free_chunk(struct iolog_compress *ic)
 791 {
 792         free(ic->buf);
 793         free(ic);
 794 }
 795
 796 static int z_stream_init(z_stream *stream, int gz_hdr)
 797 {
 798         int wbits = 15;
 799
 800         memset(stream, 0, sizeof(*stream));
 801         stream->zalloc = Z_NULL;
 802         stream->zfree = Z_NULL;
 803         stream->opaque = Z_NULL;
 804         stream->next_in = Z_NULL;
 805
 806         /*
 807          * zlib magic - add 32 for auto-detection of gz header or not,
 808          * if we decide to store files in a gzip friendly format.
 809          */
 810         if (gz_hdr)
 811                 wbits += 32;
 812
 813         if (inflateInit2(stream, wbits) != Z_OK)
 814                 return 1;
 815
 816         return 0;
 817 }
 818
 819 struct inflate_chunk_iter {
 820         unsigned int seq;
 821         int err;
 822         void *buf;
 823         size_t buf_size;
 824         size_t buf_used;
 825         size_t chunk_sz;
 826 };
 827
 828 static void finish_chunk(z_stream *stream, FILE *f,
 829                          struct inflate_chunk_iter *iter)
 830 {
 831         int ret;
 832
 833         ret = inflateEnd(stream);
 834         if (ret != Z_OK)
 835                 log_err("fio: failed to end log inflation seq %d (%d)\n",
 836                                 iter->seq, ret);
 837
 838         flush_samples(f, iter->buf, iter->buf_used);
 839         free(iter->buf);
 840         iter->buf = NULL;
 841         iter->buf_size = iter->buf_used = 0;
 842 }
 843
 844 /*
 845  * Iterative chunk inflation. Handles cases where we cross into a new
 846  * sequence, doing flush finish of previous chunk if needed.
 847  */
 848 static size_t inflate_chunk(struct iolog_compress *ic, int gz_hdr, FILE *f,
 849                             z_stream *stream, struct inflate_chunk_iter *iter)
 850 {
 851         size_t ret;
 852
 853         dprint(FD_COMPRESS, "inflate chunk size=%lu, seq=%u\n",
 854                                 (unsigned long) ic->len, ic->seq);
 855
 856         if (ic->seq != iter->seq) {
 857                 if (iter->seq)
 858                         finish_chunk(stream, f, iter);
 859
 860                 z_stream_init(stream, gz_hdr);
 861                 iter->seq = ic->seq;
 862         }
 863
 864         stream->avail_in = ic->len;
 865         stream->next_in = ic->buf;
 866
 867         if (!iter->buf_size) {
 868                 iter->buf_size = iter->chunk_sz;
 869                 iter->buf = malloc(iter->buf_size);
 870         }
 871
 872         while (stream->avail_in) {
 873                 size_t this_out = iter->buf_size - iter->buf_used;
 874                 int err;
 875
 876                 stream->avail_out = this_out;
 877                 stream->next_out = iter->buf + iter->buf_used;
 878
 879                 err = inflate(stream, Z_NO_FLUSH);
 880                 if (err < 0) {
 881                         log_err("fio: failed inflating log: %d\n", err);
 882                         iter->err = err;
 883                         break;
 884                 }
 885
 886                 iter->buf_used += this_out - stream->avail_out;
 887
 888                 if (!stream->avail_out) {
 889                         iter->buf_size += iter->chunk_sz;
 890                         iter->buf = realloc(iter->buf, iter->buf_size);
 891                         continue;
 892                 }
 893
 894                 if (err == Z_STREAM_END)
 895                         break;
 896         }
 897
 898         ret = (void *) stream->next_in - ic->buf;
 899
 900         dprint(FD_COMPRESS, "inflated to size=%lu\n", (unsigned long) iter->buf_size);
 901
 902         return ret;
 903 }
 904
 905 /*
 906  * Inflate stored compressed chunks, or write them directly to the log
 907  * file if so instructed.
 908  */
 909 static int inflate_gz_chunks(struct io_log *log, FILE *f)
 910 {
 911         struct inflate_chunk_iter iter = { .chunk_sz = log->log_gz, };
 912         z_stream stream;
 913
 914         while (!flist_empty(&log->chunk_list)) {
 915                 struct iolog_compress *ic;
 916
 917                 ic = flist_first_entry(&log->chunk_list, struct iolog_compress, list);
 918                 flist_del(&ic->list);
 919
 920                 if (log->log_gz_store) {
 921                         size_t ret;
 922
 923                         dprint(FD_COMPRESS, "log write chunk size=%lu, "
 924                                 "seq=%u\n", (unsigned long) ic->len, ic->seq);
 925
 926                         ret = fwrite(ic->buf, ic->len, 1, f);
 927                         if (ret != 1 || ferror(f)) {
 928                                 iter.err = errno;
 929                                 log_err("fio: error writing compressed log\n");
 930                         }
 931                 } else
 932                         inflate_chunk(ic, log->log_gz_store, f, &stream, &iter);
 933
 934                 free_chunk(ic);
 935         }
 936
 937         if (iter.seq) {
 938                 finish_chunk(&stream, f, &iter);
 939                 free(iter.buf);
 940         }
 941
 942         return iter.err;
 943 }
 944
 945 /*
 946  * Open compressed log file and decompress the stored chunks and
 947  * write them to stdout. The chunks are stored sequentially in the
 948  * file, so we iterate over them and do them one-by-one.
 949  */
 950 int iolog_file_inflate(const char *file)
 951 {
 952         struct inflate_chunk_iter iter = { .chunk_sz = 64 * 1024 * 1024, };
 953         struct iolog_compress ic;
 954         z_stream stream;
 955         struct stat sb;
 956         ssize_t ret;
 957         size_t total;
 958         void *buf;
 959         FILE *f;
 960
 961         f = fopen(file, "r");
 962         if (!f) {
 963                 perror("fopen");
 964                 return 1;
 965         }
 966
 967         if (stat(file, &sb) < 0) {
 968                 fclose(f);
 969                 perror("stat");
 970                 return 1;
 971         }
 972
 973         ic.buf = buf = malloc(sb.st_size);
 974         ic.len = sb.st_size;
 975         ic.seq = 1;
 976
 977         ret = fread(ic.buf, ic.len, 1, f);
 978         if (ret < 0) {
 979                 perror("fread");
 980                 fclose(f);
 981                 free(buf);
 982                 return 1;
 983         } else if (ret != 1) {
 984                 log_err("fio: short read on reading log\n");
 985                 fclose(f);
 986                 free(buf);
 987                 return 1;
 988         }
 989
 990         fclose(f);
 991
 992         /*
 993          * Each chunk will return Z_STREAM_END. We don't know how many
 994          * chunks are in the file, so we just keep looping and incrementing
 995          * the sequence number until we have consumed the whole compressed
 996          * file.
 997          */
 998         total = ic.len;
 999         do {
1000                 size_t iret;
1001
1002                 iret = inflate_chunk(&ic,  1, stdout, &stream, &iter);
1003                 total -= iret;
1004                 if (!total)
1005                         break;
1006                 if (iter.err)
1007                         break;
1008
1009                 ic.seq++;
1010                 ic.len -= iret;
1011                 ic.buf += iret;
1012         } while (1);
1013
1014         if (iter.seq) {
1015                 finish_chunk(&stream, stdout, &iter);
1016                 free(iter.buf);
1017         }
1018
1019         free(buf);
1020         return iter.err;
1021 }
1022
1023 #else
1024
1025 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1026 {
1027         return 0;
1028 }
1029
1030 int iolog_file_inflate(const char *file)
1031 {
1032         log_err("fio: log inflation not possible without zlib\n");
1033         return 1;
1034 }
1035
1036 #endif
1037
1038 void flush_log(struct io_log *log, bool do_append)
1039 {
1040         void *buf;
1041         FILE *f;
1042
1043         if (!do_append)
1044                 f = fopen(log->filename, "w");
1045         else
1046                 f = fopen(log->filename, "a");
1047         if (!f) {
1048                 perror("fopen log");
1049                 return;
1050         }
1051
1052         buf = set_file_buffer(f);
1053
1054         inflate_gz_chunks(log, f);
1055
1056         while (!flist_empty(&log->io_logs)) {
1057                 struct io_logs *cur_log;
1058
1059                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1060                 flist_del_init(&cur_log->list);
1061
1062                 if (log == log->td->clat_hist_log)
1063                         flush_hist_samples(f, log->hist_coarseness, cur_log->log,
1064                                            cur_log->nr_samples * log_entry_sz(log));
1065                 else
1066                         flush_samples(f, cur_log->log, cur_log->nr_samples * log_entry_sz(log));
1067
1068                 sfree(cur_log);
1069         }
1070
1071         fclose(f);
1072         clear_file_buffer(buf);
1073 }
1074
1075 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
1076 {
1077         if (td->flags & TD_F_COMPRESS_LOG)
1078                 iolog_flush(log);
1079
1080         if (trylock) {
1081                 if (fio_trylock_file(log->filename))
1082                         return 1;
1083         } else
1084                 fio_lock_file(log->filename);
1085
1086         if (td->client_type == FIO_CLIENT_TYPE_GUI || is_backend)
1087                 fio_send_iolog(td, log, log->filename);
1088         else
1089                 flush_log(log, !td->o.per_job_logs);
1090
1091         fio_unlock_file(log->filename);
1092         free_log(log);
1093         return 0;
1094 }
1095
1096 size_t log_chunk_sizes(struct io_log *log)
1097 {
1098         struct flist_head *entry;
1099         size_t ret;
1100
1101         if (flist_empty(&log->chunk_list))
1102                 return 0;
1103
1104         ret = 0;
1105         pthread_mutex_lock(&log->chunk_lock);
1106         flist_for_each(entry, &log->chunk_list) {
1107                 struct iolog_compress *c;
1108
1109                 c = flist_entry(entry, struct iolog_compress, list);
1110                 ret += c->len;
1111         }
1112         pthread_mutex_unlock(&log->chunk_lock);
1113         return ret;
1114 }
1115
1116 #ifdef CONFIG_ZLIB
1117
1118 static int gz_work(struct iolog_flush_data *data)
1119 {
1120         struct iolog_compress *c = NULL;
1121         struct flist_head list;
1122         unsigned int seq;
1123         z_stream stream;
1124         size_t total = 0;
1125         int ret;
1126
1127         INIT_FLIST_HEAD(&list);
1128
1129         memset(&stream, 0, sizeof(stream));
1130         stream.zalloc = Z_NULL;
1131         stream.zfree = Z_NULL;
1132         stream.opaque = Z_NULL;
1133
1134         ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
1135         if (ret != Z_OK) {
1136                 log_err("fio: failed to init gz stream\n");
1137                 goto err;
1138         }
1139
1140         seq = ++data->log->chunk_seq;
1141
1142         stream.next_in = (void *) data->samples;
1143         stream.avail_in = data->nr_samples * log_entry_sz(data->log);
1144
1145         dprint(FD_COMPRESS, "deflate input size=%lu, seq=%u, log=%s\n",
1146                                 (unsigned long) stream.avail_in, seq,
1147                                 data->log->filename);
1148         do {
1149                 if (c)
1150                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, c->len);
1151                 c = get_new_chunk(seq);
1152                 stream.avail_out = GZ_CHUNK;
1153                 stream.next_out = c->buf;
1154                 ret = deflate(&stream, Z_NO_FLUSH);
1155                 if (ret < 0) {
1156                         log_err("fio: deflate log (%d)\n", ret);
1157                         free_chunk(c);
1158                         goto err;
1159                 }
1160
1161                 c->len = GZ_CHUNK - stream.avail_out;
1162                 flist_add_tail(&c->list, &list);
1163                 total += c->len;
1164         } while (stream.avail_in);
1165
1166         stream.next_out = c->buf + c->len;
1167         stream.avail_out = GZ_CHUNK - c->len;
1168
1169         ret = deflate(&stream, Z_FINISH);
1170         if (ret < 0) {
1171                 /*
1172                  * Z_BUF_ERROR is special, it just means we need more
1173                  * output space. We'll handle that below. Treat any other
1174                  * error as fatal.
1175                  */
1176                 if (ret != Z_BUF_ERROR) {
1177                         log_err("fio: deflate log (%d)\n", ret);
1178                         flist_del(&c->list);
1179                         free_chunk(c);
1180                         goto err;
1181                 }
1182         }
1183
1184         total -= c->len;
1185         c->len = GZ_CHUNK - stream.avail_out;
1186         total += c->len;
1187         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, c->len);
1188
1189         if (ret != Z_STREAM_END) {
1190                 do {
1191                         c = get_new_chunk(seq);
1192                         stream.avail_out = GZ_CHUNK;
1193                         stream.next_out = c->buf;
1194                         ret = deflate(&stream, Z_FINISH);
1195                         c->len = GZ_CHUNK - stream.avail_out;
1196                         total += c->len;
1197                         flist_add_tail(&c->list, &list);
1198                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, c->len);
1199                 } while (ret != Z_STREAM_END);
1200         }
1201
1202         dprint(FD_COMPRESS, "deflated to size=%lu\n", (unsigned long) total);
1203
1204         ret = deflateEnd(&stream);
1205         if (ret != Z_OK)
1206                 log_err("fio: deflateEnd %d\n", ret);
1207
1208         free(data->samples);
1209
1210         if (!flist_empty(&list)) {
1211                 pthread_mutex_lock(&data->log->chunk_lock);
1212                 flist_splice_tail(&list, &data->log->chunk_list);
1213                 pthread_mutex_unlock(&data->log->chunk_lock);
1214         }
1215
1216         ret = 0;
1217 done:
1218         if (data->free)
1219                 free(data);
1220         return ret;
1221 err:
1222         while (!flist_empty(&list)) {
1223                 c = flist_first_entry(list.next, struct iolog_compress, list);
1224                 flist_del(&c->list);
1225                 free_chunk(c);
1226         }
1227         ret = 1;
1228         goto done;
1229 }
1230
1231 /*
1232  * Invoked from our compress helper thread, when logging would have exceeded
1233  * the specified memory limitation. Compresses the previously stored
1234  * entries.
1235  */
1236 static int gz_work_async(struct submit_worker *sw, struct workqueue_work *work)
1237 {
1238         return gz_work(container_of(work, struct iolog_flush_data, work));
1239 }
1240
1241 static int gz_init_worker(struct submit_worker *sw)
1242 {
1243         struct thread_data *td = sw->wq->td;
1244
1245         if (!fio_option_is_set(&td->o, log_gz_cpumask))
1246                 return 0;
1247
1248         if (fio_setaffinity(gettid(), td->o.log_gz_cpumask) == -1) {
1249                 log_err("gz: failed to set CPU affinity\n");
1250                 return 1;
1251         }
1252
1253         return 0;
1254 }
1255
1256 static struct workqueue_ops log_compress_wq_ops = {
1257         .fn             = gz_work_async,
1258         .init_worker_fn = gz_init_worker,
1259         .nice           = 1,
1260 };
1261
1262 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1263 {
1264         if (!(td->flags & TD_F_COMPRESS_LOG))
1265                 return 0;
1266
1267         workqueue_init(td, &td->log_compress_wq, &log_compress_wq_ops, 1, sk_out);
1268         return 0;
1269 }
1270
1271 void iolog_compress_exit(struct thread_data *td)
1272 {
1273         if (!(td->flags & TD_F_COMPRESS_LOG))
1274                 return;
1275
1276         workqueue_exit(&td->log_compress_wq);
1277 }
1278
1279 /*
1280  * Queue work item to compress the existing log entries. We reset the
1281  * current log to a small size, and reference the existing log in the
1282  * data that we queue for compression. Once compression has been done,
1283  * this old log is freed. If called with finish == true, will not return
1284  * until the log compression has completed, and will flush all previous
1285  * logs too
1286  */
1287 static int iolog_flush(struct io_log *log)
1288 {
1289         struct iolog_flush_data *data;
1290
1291         data = malloc(sizeof(*data));
1292         if (!data)
1293                 return 1;
1294
1295         data->log = log;
1296         data->free = false;
1297
1298         while (!flist_empty(&log->io_logs)) {
1299                 struct io_logs *cur_log;
1300
1301                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1302                 flist_del_init(&cur_log->list);
1303
1304                 data->samples = cur_log->log;
1305                 data->nr_samples = cur_log->nr_samples;
1306
1307                 sfree(cur_log);
1308
1309                 gz_work(data);
1310         }
1311
1312         free(data);
1313         return 0;
1314 }
1315
1316 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1317 {
1318         struct iolog_flush_data *data;
1319
1320         data = malloc(sizeof(*data));
1321         if (!data)
1322                 return 1;
1323
1324         data->log = log;
1325
1326         data->samples = cur_log->log;
1327         data->nr_samples = cur_log->nr_samples;
1328         data->free = true;
1329
1330         cur_log->nr_samples = cur_log->max_samples = 0;
1331         cur_log->log = NULL;
1332
1333         workqueue_enqueue(&log->td->log_compress_wq, &data->work);
1334         return 0;
1335 }
1336 #else
1337
1338 static int iolog_flush(struct io_log *log)
1339 {
1340         return 1;
1341 }
1342
1343 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1344 {
1345         return 1;
1346 }
1347
1348 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1349 {
1350         return 0;
1351 }
1352
1353 void iolog_compress_exit(struct thread_data *td)
1354 {
1355 }
1356
1357 #endif
1358
1359 struct io_logs *iolog_cur_log(struct io_log *log)
1360 {
1361         if (flist_empty(&log->io_logs))
1362                 return NULL;
1363
1364         return flist_last_entry(&log->io_logs, struct io_logs, list);
1365 }
1366
1367 uint64_t iolog_nr_samples(struct io_log *iolog)
1368 {
1369         struct flist_head *entry;
1370         uint64_t ret = 0;
1371
1372         flist_for_each(entry, &iolog->io_logs) {
1373                 struct io_logs *cur_log;
1374
1375                 cur_log = flist_entry(entry, struct io_logs, list);
1376                 ret += cur_log->nr_samples;
1377         }
1378
1379         return ret;
1380 }
1381
1382 static int __write_log(struct thread_data *td, struct io_log *log, int try)
1383 {
1384         if (log)
1385                 return finish_log(td, log, try);
1386
1387         return 0;
1388 }
1389
1390 static int write_iops_log(struct thread_data *td, int try, bool unit_log)
1391 {
1392         int ret;
1393
1394         if (per_unit_log(td->iops_log) != unit_log)
1395                 return 0;
1396
1397         ret = __write_log(td, td->iops_log, try);
1398         if (!ret)
1399                 td->iops_log = NULL;
1400
1401         return ret;
1402 }
1403
1404 static int write_slat_log(struct thread_data *td, int try, bool unit_log)
1405 {
1406         int ret;
1407
1408         if (!unit_log)
1409                 return 0;
1410
1411         ret = __write_log(td, td->slat_log, try);
1412         if (!ret)
1413                 td->slat_log = NULL;
1414
1415         return ret;
1416 }
1417
1418 static int write_clat_log(struct thread_data *td, int try, bool unit_log)
1419 {
1420         int ret;
1421
1422         if (!unit_log)
1423                 return 0;
1424
1425         ret = __write_log(td, td->clat_log, try);
1426         if (!ret)
1427                 td->clat_log = NULL;
1428
1429         return ret;
1430 }
1431
1432 static int write_clat_hist_log(struct thread_data *td, int try, bool unit_log)
1433 {
1434         int ret;
1435
1436         if (!unit_log)
1437                 return 0;
1438
1439         ret = __write_log(td, td->clat_hist_log, try);
1440         if (!ret)
1441                 td->clat_hist_log = NULL;
1442
1443         return ret;
1444 }
1445
1446 static int write_lat_log(struct thread_data *td, int try, bool unit_log)
1447 {
1448         int ret;
1449
1450         if (!unit_log)
1451                 return 0;
1452
1453         ret = __write_log(td, td->lat_log, try);
1454         if (!ret)
1455                 td->lat_log = NULL;
1456
1457         return ret;
1458 }
1459
1460 static int write_bandw_log(struct thread_data *td, int try, bool unit_log)
1461 {
1462         int ret;
1463
1464         if (per_unit_log(td->bw_log) != unit_log)
1465                 return 0;
1466
1467         ret = __write_log(td, td->bw_log, try);
1468         if (!ret)
1469                 td->bw_log = NULL;
1470
1471         return ret;
1472 }
1473
1474 enum {
1475         BW_LOG_MASK     = 1,
1476         LAT_LOG_MASK    = 2,
1477         SLAT_LOG_MASK   = 4,
1478         CLAT_LOG_MASK   = 8,
1479         IOPS_LOG_MASK   = 16,
1480         CLAT_HIST_LOG_MASK = 32,
1481
1482         ALL_LOG_NR      = 6,
1483 };
1484
1485 struct log_type {
1486         unsigned int mask;
1487         int (*fn)(struct thread_data *, int, bool);
1488 };
1489
1490 static struct log_type log_types[] = {
1491         {
1492                 .mask   = BW_LOG_MASK,
1493                 .fn     = write_bandw_log,
1494         },
1495         {
1496                 .mask   = LAT_LOG_MASK,
1497                 .fn     = write_lat_log,
1498         },
1499         {
1500                 .mask   = SLAT_LOG_MASK,
1501                 .fn     = write_slat_log,
1502         },
1503         {
1504                 .mask   = CLAT_LOG_MASK,
1505                 .fn     = write_clat_log,
1506         },
1507         {
1508                 .mask   = IOPS_LOG_MASK,
1509                 .fn     = write_iops_log,
1510         },
1511         {
1512                 .mask   = CLAT_HIST_LOG_MASK,
1513                 .fn     = write_clat_hist_log,
1514         }
1515 };
1516
1517 void td_writeout_logs(struct thread_data *td, bool unit_logs)
1518 {
1519         unsigned int log_mask = 0;
1520         unsigned int log_left = ALL_LOG_NR;
1521         int old_state, i;
1522
1523         old_state = td_bump_runstate(td, TD_FINISHING);
1524
1525         finalize_logs(td, unit_logs);
1526
1527         while (log_left) {
1528                 int prev_log_left = log_left;
1529
1530                 for (i = 0; i < ALL_LOG_NR && log_left; i++) {
1531                         struct log_type *lt = &log_types[i];
1532                         int ret;
1533
1534                         if (!(log_mask & lt->mask)) {
1535                                 ret = lt->fn(td, log_left != 1, unit_logs);
1536                                 if (!ret) {
1537                                         log_left--;
1538                                         log_mask |= lt->mask;
1539                                 }
1540                         }
1541                 }
1542
1543                 if (prev_log_left == log_left)
1544                         usleep(5000);
1545         }
1546
1547         td_restore_runstate(td, old_state);
1548 }
1549
1550 void fio_writeout_logs(bool unit_logs)
1551 {
1552         struct thread_data *td;
1553         int i;
1554
1555         for_each_td(td, i)
1556                 td_writeout_logs(td, unit_logs);
1557 }