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 <assert.h>
   8 #include <sys/types.h>
   9 #include <sys/stat.h>
  10 #include <unistd.h>
  11 #ifdef CONFIG_ZLIB
  12 #include <zlib.h>
  13 #endif
  14
  15 #include "flist.h"
  16 #include "fio.h"
  17 #include "trim.h"
  18 #include "filelock.h"
  19 #include "smalloc.h"
  20 #include "blktrace.h"
  21 #include "pshared.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         unsigned long orig_delay = delay;
  67         uint64_t this_delay;
  68         struct timespec ts;
  69
  70         if (delay < td->time_offset) {
  71                 td->time_offset = 0;
  72                 return;
  73         }
  74
  75         delay -= td->time_offset;
  76         if (delay < usec)
  77                 return;
  78
  79         delay -= usec;
  80
  81         fio_gettime(&ts, NULL);
  82         while (delay && !td->terminate) {
  83                 this_delay = delay;
  84                 if (this_delay > 500000)
  85                         this_delay = 500000;
  86
  87                 usec_sleep(td, this_delay);
  88                 delay -= this_delay;
  89         }
  90
  91         usec = utime_since_now(&ts);
  92         if (usec > orig_delay)
  93                 td->time_offset = usec - orig_delay;
  94         else
  95                 td->time_offset = 0;
  96 }
  97
  98 static int ipo_special(struct thread_data *td, struct io_piece *ipo)
  99 {
 100         struct fio_file *f;
 101         int ret;
 102
 103         /*
 104          * Not a special ipo
 105          */
 106         if (ipo->ddir != DDIR_INVAL)
 107                 return 0;
 108
 109         f = td->files[ipo->fileno];
 110
 111         switch (ipo->file_action) {
 112         case FIO_LOG_OPEN_FILE:
 113                 if (td->o.replay_redirect && fio_file_open(f)) {
 114                         dprint(FD_FILE, "iolog: ignoring re-open of file %s\n",
 115                                         f->file_name);
 116                         break;
 117                 }
 118                 ret = td_io_open_file(td, f);
 119                 if (!ret)
 120                         break;
 121                 td_verror(td, ret, "iolog open file");
 122                 return -1;
 123         case FIO_LOG_CLOSE_FILE:
 124                 td_io_close_file(td, f);
 125                 break;
 126         case FIO_LOG_UNLINK_FILE:
 127                 td_io_unlink_file(td, f);
 128                 break;
 129         default:
 130                 log_err("fio: bad file action %d\n", ipo->file_action);
 131                 break;
 132         }
 133
 134         return 1;
 135 }
 136
 137 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
 138 {
 139         struct io_piece *ipo;
 140         unsigned long elapsed;
 141
 142         while (!flist_empty(&td->io_log_list)) {
 143                 int ret;
 144
 145                 ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
 146                 flist_del(&ipo->list);
 147                 remove_trim_entry(td, ipo);
 148
 149                 ret = ipo_special(td, ipo);
 150                 if (ret < 0) {
 151                         free(ipo);
 152                         break;
 153                 } else if (ret > 0) {
 154                         free(ipo);
 155                         continue;
 156                 }
 157
 158                 io_u->ddir = ipo->ddir;
 159                 if (ipo->ddir != DDIR_WAIT) {
 160                         io_u->offset = ipo->offset;
 161                         io_u->buflen = ipo->len;
 162                         io_u->file = td->files[ipo->fileno];
 163                         get_file(io_u->file);
 164                         dprint(FD_IO, "iolog: get %llu/%lu/%s\n", io_u->offset,
 165                                                 io_u->buflen, io_u->file->file_name);
 166                         if (ipo->delay)
 167                                 iolog_delay(td, ipo->delay);
 168                 } else {
 169                         elapsed = mtime_since_genesis();
 170                         if (ipo->delay > elapsed)
 171                                 usec_sleep(td, (ipo->delay - elapsed) * 1000);
 172                 }
 173
 174                 free(ipo);
 175
 176                 if (io_u->ddir != DDIR_WAIT)
 177                         return 0;
 178         }
 179
 180         td->done = 1;
 181         return 1;
 182 }
 183
 184 void prune_io_piece_log(struct thread_data *td)
 185 {
 186         struct io_piece *ipo;
 187         struct fio_rb_node *n;
 188
 189         while ((n = rb_first(&td->io_hist_tree)) != NULL) {
 190                 ipo = rb_entry(n, struct io_piece, rb_node);
 191                 rb_erase(n, &td->io_hist_tree);
 192                 remove_trim_entry(td, ipo);
 193                 td->io_hist_len--;
 194                 free(ipo);
 195         }
 196
 197         while (!flist_empty(&td->io_hist_list)) {
 198                 ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
 199                 flist_del(&ipo->list);
 200                 remove_trim_entry(td, ipo);
 201                 td->io_hist_len--;
 202                 free(ipo);
 203         }
 204 }
 205
 206 /*
 207  * log a successful write, so we can unwind the log for verify
 208  */
 209 void log_io_piece(struct thread_data *td, struct io_u *io_u)
 210 {
 211         struct fio_rb_node **p, *parent;
 212         struct io_piece *ipo, *__ipo;
 213
 214         ipo = malloc(sizeof(struct io_piece));
 215         init_ipo(ipo);
 216         ipo->file = io_u->file;
 217         ipo->offset = io_u->offset;
 218         ipo->len = io_u->buflen;
 219         ipo->numberio = io_u->numberio;
 220         ipo->flags = IP_F_IN_FLIGHT;
 221
 222         io_u->ipo = ipo;
 223
 224         if (io_u_should_trim(td, io_u)) {
 225                 flist_add_tail(&ipo->trim_list, &td->trim_list);
 226                 td->trim_entries++;
 227         }
 228
 229         /*
 230          * Only sort writes if we don't have a random map in which case we need
 231          * to check for duplicate blocks and drop the old one, which we rely on
 232          * the rb insert/lookup for handling.
 233          */
 234         if (file_randommap(td, ipo->file)) {
 235                 INIT_FLIST_HEAD(&ipo->list);
 236                 flist_add_tail(&ipo->list, &td->io_hist_list);
 237                 ipo->flags |= IP_F_ONLIST;
 238                 td->io_hist_len++;
 239                 return;
 240         }
 241
 242         RB_CLEAR_NODE(&ipo->rb_node);
 243
 244         /*
 245          * Sort the entry into the verification list
 246          */
 247 restart:
 248         p = &td->io_hist_tree.rb_node;
 249         parent = NULL;
 250         while (*p) {
 251                 int overlap = 0;
 252                 parent = *p;
 253
 254                 __ipo = rb_entry(parent, struct io_piece, rb_node);
 255                 if (ipo->file < __ipo->file)
 256                         p = &(*p)->rb_left;
 257                 else if (ipo->file > __ipo->file)
 258                         p = &(*p)->rb_right;
 259                 else if (ipo->offset < __ipo->offset) {
 260                         p = &(*p)->rb_left;
 261                         overlap = ipo->offset + ipo->len > __ipo->offset;
 262                 }
 263                 else if (ipo->offset > __ipo->offset) {
 264                         p = &(*p)->rb_right;
 265                         overlap = __ipo->offset + __ipo->len > ipo->offset;
 266                 }
 267                 else
 268                         overlap = 1;
 269
 270                 if (overlap) {
 271                         dprint(FD_IO, "iolog: overlap %llu/%lu, %llu/%lu\n",
 272                                 __ipo->offset, __ipo->len,
 273                                 ipo->offset, ipo->len);
 274                         td->io_hist_len--;
 275                         rb_erase(parent, &td->io_hist_tree);
 276                         remove_trim_entry(td, __ipo);
 277                         if (!(__ipo->flags & IP_F_IN_FLIGHT))
 278                                 free(__ipo);
 279                         goto restart;
 280                 }
 281         }
 282
 283         rb_link_node(&ipo->rb_node, parent, p);
 284         rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
 285         ipo->flags |= IP_F_ONRB;
 286         td->io_hist_len++;
 287 }
 288
 289 void unlog_io_piece(struct thread_data *td, struct io_u *io_u)
 290 {
 291         struct io_piece *ipo = io_u->ipo;
 292
 293         if (td->ts.nr_block_infos) {
 294                 uint32_t *info = io_u_block_info(td, io_u);
 295                 if (BLOCK_INFO_STATE(*info) < BLOCK_STATE_TRIM_FAILURE) {
 296                         if (io_u->ddir == DDIR_TRIM)
 297                                 *info = BLOCK_INFO_SET_STATE(*info,
 298                                                 BLOCK_STATE_TRIM_FAILURE);
 299                         else if (io_u->ddir == DDIR_WRITE)
 300                                 *info = BLOCK_INFO_SET_STATE(*info,
 301                                                 BLOCK_STATE_WRITE_FAILURE);
 302                 }
 303         }
 304
 305         if (!ipo)
 306                 return;
 307
 308         if (ipo->flags & IP_F_ONRB)
 309                 rb_erase(&ipo->rb_node, &td->io_hist_tree);
 310         else if (ipo->flags & IP_F_ONLIST)
 311                 flist_del(&ipo->list);
 312
 313         free(ipo);
 314         io_u->ipo = NULL;
 315         td->io_hist_len--;
 316 }
 317
 318 void trim_io_piece(struct thread_data *td, const struct io_u *io_u)
 319 {
 320         struct io_piece *ipo = io_u->ipo;
 321
 322         if (!ipo)
 323                 return;
 324
 325         ipo->len = io_u->xfer_buflen - io_u->resid;
 326 }
 327
 328 void write_iolog_close(struct thread_data *td)
 329 {
 330         fflush(td->iolog_f);
 331         fclose(td->iolog_f);
 332         free(td->iolog_buf);
 333         td->iolog_f = NULL;
 334         td->iolog_buf = NULL;
 335 }
 336
 337 /*
 338  * Read version 2 iolog data. It is enhanced to include per-file logging,
 339  * syncs, etc.
 340  */
 341 static int read_iolog2(struct thread_data *td, FILE *f)
 342 {
 343         unsigned long long offset;
 344         unsigned int bytes;
 345         int reads, writes, waits, fileno = 0, file_action = 0; /* stupid gcc */
 346         char *rfname, *fname, *act;
 347         char *str, *p;
 348         enum fio_ddir rw;
 349
 350         free_release_files(td);
 351
 352         /*
 353          * Read in the read iolog and store it, reuse the infrastructure
 354          * for doing verifications.
 355          */
 356         str = malloc(4096);
 357         rfname = fname = malloc(256+16);
 358         act = malloc(256+16);
 359
 360         reads = writes = waits = 0;
 361         while ((p = fgets(str, 4096, f)) != NULL) {
 362                 struct io_piece *ipo;
 363                 int r;
 364
 365                 r = sscanf(p, "%256s %256s %llu %u", rfname, act, &offset,
 366                                                                         &bytes);
 367
 368                 if (td->o.replay_redirect)
 369                         fname = td->o.replay_redirect;
 370
 371                 if (r == 4) {
 372                         /*
 373                          * Check action first
 374                          */
 375                         if (!strcmp(act, "wait"))
 376                                 rw = DDIR_WAIT;
 377                         else if (!strcmp(act, "read"))
 378                                 rw = DDIR_READ;
 379                         else if (!strcmp(act, "write"))
 380                                 rw = DDIR_WRITE;
 381                         else if (!strcmp(act, "sync"))
 382                                 rw = DDIR_SYNC;
 383                         else if (!strcmp(act, "datasync"))
 384                                 rw = DDIR_DATASYNC;
 385                         else if (!strcmp(act, "trim"))
 386                                 rw = DDIR_TRIM;
 387                         else {
 388                                 log_err("fio: bad iolog file action: %s\n",
 389                                                                         act);
 390                                 continue;
 391                         }
 392                         fileno = get_fileno(td, fname);
 393                 } else if (r == 2) {
 394                         rw = DDIR_INVAL;
 395                         if (!strcmp(act, "add")) {
 396                                 if (td->o.replay_redirect &&
 397                                     get_fileno(td, fname) != -1) {
 398                                         dprint(FD_FILE, "iolog: ignoring"
 399                                                 " re-add of file %s\n", fname);
 400                                 } else {
 401                                         fileno = add_file(td, fname, 0, 1);
 402                                         file_action = FIO_LOG_ADD_FILE;
 403                                 }
 404                                 continue;
 405                         } else if (!strcmp(act, "open")) {
 406                                 fileno = get_fileno(td, fname);
 407                                 file_action = FIO_LOG_OPEN_FILE;
 408                         } else if (!strcmp(act, "close")) {
 409                                 fileno = get_fileno(td, fname);
 410                                 file_action = FIO_LOG_CLOSE_FILE;
 411                         } else {
 412                                 log_err("fio: bad iolog file action: %s\n",
 413                                                                         act);
 414                                 continue;
 415                         }
 416                 } else {
 417                         log_err("bad iolog2: %s\n", p);
 418                         continue;
 419                 }
 420
 421                 if (rw == DDIR_READ)
 422                         reads++;
 423                 else if (rw == DDIR_WRITE) {
 424                         /*
 425                          * Don't add a write for ro mode
 426                          */
 427                         if (read_only)
 428                                 continue;
 429                         writes++;
 430                 } else if (rw == DDIR_WAIT) {
 431                         if (td->o.no_stall)
 432                                 continue;
 433                         waits++;
 434                 } else if (rw == DDIR_INVAL) {
 435                 } else if (!ddir_sync(rw)) {
 436                         log_err("bad ddir: %d\n", rw);
 437                         continue;
 438                 }
 439
 440                 /*
 441                  * Make note of file
 442                  */
 443                 ipo = malloc(sizeof(*ipo));
 444                 init_ipo(ipo);
 445                 ipo->ddir = rw;
 446                 if (rw == DDIR_WAIT) {
 447                         ipo->delay = offset;
 448                 } else {
 449                         if (td->o.replay_scale)
 450                                 ipo->offset = offset / td->o.replay_scale;
 451                         else
 452                                 ipo->offset = offset;
 453                         ipo_bytes_align(td->o.replay_align, ipo);
 454
 455                         ipo->len = bytes;
 456                         if (rw != DDIR_INVAL && bytes > td->o.max_bs[rw])
 457                                 td->o.max_bs[rw] = bytes;
 458                         ipo->fileno = fileno;
 459                         ipo->file_action = file_action;
 460                         td->o.size += bytes;
 461                 }
 462
 463                 queue_io_piece(td, ipo);
 464         }
 465
 466         free(str);
 467         free(act);
 468         free(rfname);
 469
 470         if (writes && read_only) {
 471                 log_err("fio: <%s> skips replay of %d writes due to"
 472                         " read-only\n", td->o.name, writes);
 473                 writes = 0;
 474         }
 475
 476         if (!reads && !writes && !waits)
 477                 return 1;
 478         else if (reads && !writes)
 479                 td->o.td_ddir = TD_DDIR_READ;
 480         else if (!reads && writes)
 481                 td->o.td_ddir = TD_DDIR_WRITE;
 482         else
 483                 td->o.td_ddir = TD_DDIR_RW;
 484
 485         return 0;
 486 }
 487
 488 /*
 489  * open iolog, check version, and call appropriate parser
 490  */
 491 static int init_iolog_read(struct thread_data *td)
 492 {
 493         char buffer[256], *p;
 494         FILE *f;
 495         int ret;
 496
 497         f = fopen(td->o.read_iolog_file, "r");
 498         if (!f) {
 499                 perror("fopen read iolog");
 500                 return 1;
 501         }
 502
 503         p = fgets(buffer, sizeof(buffer), f);
 504         if (!p) {
 505                 td_verror(td, errno, "iolog read");
 506                 log_err("fio: unable to read iolog\n");
 507                 fclose(f);
 508                 return 1;
 509         }
 510
 511         /*
 512          * version 2 of the iolog stores a specific string as the
 513          * first line, check for that
 514          */
 515         if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2)))
 516                 ret = read_iolog2(td, f);
 517         else {
 518                 log_err("fio: iolog version 1 is no longer supported\n");
 519                 ret = 1;
 520         }
 521
 522         fclose(f);
 523         return ret;
 524 }
 525
 526 /*
 527  * Set up a log for storing io patterns.
 528  */
 529 static int init_iolog_write(struct thread_data *td)
 530 {
 531         struct fio_file *ff;
 532         FILE *f;
 533         unsigned int i;
 534
 535         f = fopen(td->o.write_iolog_file, "a");
 536         if (!f) {
 537                 perror("fopen write iolog");
 538                 return 1;
 539         }
 540
 541         /*
 542          * That's it for writing, setup a log buffer and we're done.
 543           */
 544         td->iolog_f = f;
 545         td->iolog_buf = malloc(8192);
 546         setvbuf(f, td->iolog_buf, _IOFBF, 8192);
 547
 548         /*
 549          * write our version line
 550          */
 551         if (fprintf(f, "%s\n", iolog_ver2) < 0) {
 552                 perror("iolog init\n");
 553                 return 1;
 554         }
 555
 556         /*
 557          * add all known files
 558          */
 559         for_each_file(td, ff, i)
 560                 log_file(td, ff, FIO_LOG_ADD_FILE);
 561
 562         return 0;
 563 }
 564
 565 int init_iolog(struct thread_data *td)
 566 {
 567         int ret = 0;
 568
 569         if (td->o.read_iolog_file) {
 570                 int need_swap;
 571
 572                 /*
 573                  * Check if it's a blktrace file and load that if possible.
 574                  * Otherwise assume it's a normal log file and load that.
 575                  */
 576                 if (is_blktrace(td->o.read_iolog_file, &need_swap))
 577                         ret = load_blktrace(td, td->o.read_iolog_file, need_swap);
 578                 else
 579                         ret = init_iolog_read(td);
 580         } else if (td->o.write_iolog_file)
 581                 ret = init_iolog_write(td);
 582
 583         if (ret)
 584                 td_verror(td, EINVAL, "failed initializing iolog");
 585
 586         return ret;
 587 }
 588
 589 void setup_log(struct io_log **log, struct log_params *p,
 590                const char *filename)
 591 {
 592         struct io_log *l;
 593         int i;
 594         struct io_u_plat_entry *entry;
 595         struct flist_head *list;
 596
 597         l = scalloc(1, sizeof(*l));
 598         INIT_FLIST_HEAD(&l->io_logs);
 599         l->log_type = p->log_type;
 600         l->log_offset = p->log_offset;
 601         l->log_gz = p->log_gz;
 602         l->log_gz_store = p->log_gz_store;
 603         l->avg_msec = p->avg_msec;
 604         l->hist_msec = p->hist_msec;
 605         l->hist_coarseness = p->hist_coarseness;
 606         l->filename = strdup(filename);
 607         l->td = p->td;
 608
 609         /* Initialize histogram lists for each r/w direction,
 610          * with initial io_u_plat of all zeros:
 611          */
 612         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 613                 list = &l->hist_window[i].list;
 614                 INIT_FLIST_HEAD(list);
 615                 entry = calloc(1, sizeof(struct io_u_plat_entry));
 616                 flist_add(&entry->list, list);
 617         }
 618
 619         if (l->td && l->td->o.io_submit_mode != IO_MODE_OFFLOAD) {
 620                 struct io_logs *p;
 621
 622                 p = calloc(1, sizeof(*l->pending));
 623                 p->max_samples = DEF_LOG_ENTRIES;
 624                 p->log = calloc(p->max_samples, log_entry_sz(l));
 625                 l->pending = p;
 626         }
 627
 628         if (l->log_offset)
 629                 l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
 630
 631         INIT_FLIST_HEAD(&l->chunk_list);
 632
 633         if (l->log_gz && !p->td)
 634                 l->log_gz = 0;
 635         else if (l->log_gz || l->log_gz_store) {
 636                 mutex_init_pshared(&l->chunk_lock);
 637                 mutex_init_pshared(&l->deferred_free_lock);
 638                 p->td->flags |= TD_F_COMPRESS_LOG;
 639         }
 640
 641         *log = l;
 642 }
 643
 644 #ifdef CONFIG_SETVBUF
 645 static void *set_file_buffer(FILE *f)
 646 {
 647         size_t size = 1048576;
 648         void *buf;
 649
 650         buf = malloc(size);
 651         setvbuf(f, buf, _IOFBF, size);
 652         return buf;
 653 }
 654
 655 static void clear_file_buffer(void *buf)
 656 {
 657         free(buf);
 658 }
 659 #else
 660 static void *set_file_buffer(FILE *f)
 661 {
 662         return NULL;
 663 }
 664
 665 static void clear_file_buffer(void *buf)
 666 {
 667 }
 668 #endif
 669
 670 void free_log(struct io_log *log)
 671 {
 672         while (!flist_empty(&log->io_logs)) {
 673                 struct io_logs *cur_log;
 674
 675                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
 676                 flist_del_init(&cur_log->list);
 677                 free(cur_log->log);
 678                 sfree(cur_log);
 679         }
 680
 681         if (log->pending) {
 682                 free(log->pending->log);
 683                 free(log->pending);
 684                 log->pending = NULL;
 685         }
 686
 687         free(log->pending);
 688         free(log->filename);
 689         sfree(log);
 690 }
 691
 692 uint64_t hist_sum(int j, int stride, uint64_t *io_u_plat,
 693                 uint64_t *io_u_plat_last)
 694 {
 695         uint64_t sum;
 696         int k;
 697
 698         if (io_u_plat_last) {
 699                 for (k = sum = 0; k < stride; k++)
 700                         sum += io_u_plat[j + k] - io_u_plat_last[j + k];
 701         } else {
 702                 for (k = sum = 0; k < stride; k++)
 703                         sum += io_u_plat[j + k];
 704         }
 705
 706         return sum;
 707 }
 708
 709 static void flush_hist_samples(FILE *f, int hist_coarseness, void *samples,
 710                                uint64_t sample_size)
 711 {
 712         struct io_sample *s;
 713         int log_offset;
 714         uint64_t i, j, nr_samples;
 715         struct io_u_plat_entry *entry, *entry_before;
 716         uint64_t *io_u_plat;
 717         uint64_t *io_u_plat_before;
 718
 719         int stride = 1 << hist_coarseness;
 720
 721         if (!sample_size)
 722                 return;
 723
 724         s = __get_sample(samples, 0, 0);
 725         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 726
 727         nr_samples = sample_size / __log_entry_sz(log_offset);
 728
 729         for (i = 0; i < nr_samples; i++) {
 730                 s = __get_sample(samples, log_offset, i);
 731
 732                 entry = s->data.plat_entry;
 733                 io_u_plat = entry->io_u_plat;
 734
 735                 entry_before = flist_first_entry(&entry->list, struct io_u_plat_entry, list);
 736                 io_u_plat_before = entry_before->io_u_plat;
 737
 738                 fprintf(f, "%lu, %u, %u, ", (unsigned long) s->time,
 739                                                 io_sample_ddir(s), s->bs);
 740                 for (j = 0; j < FIO_IO_U_PLAT_NR - stride; j += stride) {
 741                         fprintf(f, "%llu, ", (unsigned long long)
 742                                 hist_sum(j, stride, io_u_plat, io_u_plat_before));
 743                 }
 744                 fprintf(f, "%llu\n", (unsigned long long)
 745                         hist_sum(FIO_IO_U_PLAT_NR - stride, stride, io_u_plat,
 746                                         io_u_plat_before));
 747
 748                 flist_del(&entry_before->list);
 749                 free(entry_before);
 750         }
 751 }
 752
 753 void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 754 {
 755         struct io_sample *s;
 756         int log_offset;
 757         uint64_t i, nr_samples;
 758
 759         if (!sample_size)
 760                 return;
 761
 762         s = __get_sample(samples, 0, 0);
 763         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 764
 765         nr_samples = sample_size / __log_entry_sz(log_offset);
 766
 767         for (i = 0; i < nr_samples; i++) {
 768                 s = __get_sample(samples, log_offset, i);
 769
 770                 if (!log_offset) {
 771                         fprintf(f, "%lu, %" PRId64 ", %u, %u\n",
 772                                         (unsigned long) s->time,
 773                                         s->data.val,
 774                                         io_sample_ddir(s), s->bs);
 775                 } else {
 776                         struct io_sample_offset *so = (void *) s;
 777
 778                         fprintf(f, "%lu, %" PRId64 ", %u, %u, %llu\n",
 779                                         (unsigned long) s->time,
 780                                         s->data.val,
 781                                         io_sample_ddir(s), s->bs,
 782                                         (unsigned long long) so->offset);
 783                 }
 784         }
 785 }
 786
 787 #ifdef CONFIG_ZLIB
 788
 789 struct iolog_flush_data {
 790         struct workqueue_work work;
 791         struct io_log *log;
 792         void *samples;
 793         uint32_t nr_samples;
 794         bool free;
 795 };
 796
 797 #define GZ_CHUNK        131072
 798
 799 static struct iolog_compress *get_new_chunk(unsigned int seq)
 800 {
 801         struct iolog_compress *c;
 802
 803         c = malloc(sizeof(*c));
 804         INIT_FLIST_HEAD(&c->list);
 805         c->buf = malloc(GZ_CHUNK);
 806         c->len = 0;
 807         c->seq = seq;
 808         return c;
 809 }
 810
 811 static void free_chunk(struct iolog_compress *ic)
 812 {
 813         free(ic->buf);
 814         free(ic);
 815 }
 816
 817 static int z_stream_init(z_stream *stream, int gz_hdr)
 818 {
 819         int wbits = 15;
 820
 821         memset(stream, 0, sizeof(*stream));
 822         stream->zalloc = Z_NULL;
 823         stream->zfree = Z_NULL;
 824         stream->opaque = Z_NULL;
 825         stream->next_in = Z_NULL;
 826
 827         /*
 828          * zlib magic - add 32 for auto-detection of gz header or not,
 829          * if we decide to store files in a gzip friendly format.
 830          */
 831         if (gz_hdr)
 832                 wbits += 32;
 833
 834         if (inflateInit2(stream, wbits) != Z_OK)
 835                 return 1;
 836
 837         return 0;
 838 }
 839
 840 struct inflate_chunk_iter {
 841         unsigned int seq;
 842         int err;
 843         void *buf;
 844         size_t buf_size;
 845         size_t buf_used;
 846         size_t chunk_sz;
 847 };
 848
 849 static void finish_chunk(z_stream *stream, FILE *f,
 850                          struct inflate_chunk_iter *iter)
 851 {
 852         int ret;
 853
 854         ret = inflateEnd(stream);
 855         if (ret != Z_OK)
 856                 log_err("fio: failed to end log inflation seq %d (%d)\n",
 857                                 iter->seq, ret);
 858
 859         flush_samples(f, iter->buf, iter->buf_used);
 860         free(iter->buf);
 861         iter->buf = NULL;
 862         iter->buf_size = iter->buf_used = 0;
 863 }
 864
 865 /*
 866  * Iterative chunk inflation. Handles cases where we cross into a new
 867  * sequence, doing flush finish of previous chunk if needed.
 868  */
 869 static size_t inflate_chunk(struct iolog_compress *ic, int gz_hdr, FILE *f,
 870                             z_stream *stream, struct inflate_chunk_iter *iter)
 871 {
 872         size_t ret;
 873
 874         dprint(FD_COMPRESS, "inflate chunk size=%lu, seq=%u\n",
 875                                 (unsigned long) ic->len, ic->seq);
 876
 877         if (ic->seq != iter->seq) {
 878                 if (iter->seq)
 879                         finish_chunk(stream, f, iter);
 880
 881                 z_stream_init(stream, gz_hdr);
 882                 iter->seq = ic->seq;
 883         }
 884
 885         stream->avail_in = ic->len;
 886         stream->next_in = ic->buf;
 887
 888         if (!iter->buf_size) {
 889                 iter->buf_size = iter->chunk_sz;
 890                 iter->buf = malloc(iter->buf_size);
 891         }
 892
 893         while (stream->avail_in) {
 894                 size_t this_out = iter->buf_size - iter->buf_used;
 895                 int err;
 896
 897                 stream->avail_out = this_out;
 898                 stream->next_out = iter->buf + iter->buf_used;
 899
 900                 err = inflate(stream, Z_NO_FLUSH);
 901                 if (err < 0) {
 902                         log_err("fio: failed inflating log: %d\n", err);
 903                         iter->err = err;
 904                         break;
 905                 }
 906
 907                 iter->buf_used += this_out - stream->avail_out;
 908
 909                 if (!stream->avail_out) {
 910                         iter->buf_size += iter->chunk_sz;
 911                         iter->buf = realloc(iter->buf, iter->buf_size);
 912                         continue;
 913                 }
 914
 915                 if (err == Z_STREAM_END)
 916                         break;
 917         }
 918
 919         ret = (void *) stream->next_in - ic->buf;
 920
 921         dprint(FD_COMPRESS, "inflated to size=%lu\n", (unsigned long) iter->buf_size);
 922
 923         return ret;
 924 }
 925
 926 /*
 927  * Inflate stored compressed chunks, or write them directly to the log
 928  * file if so instructed.
 929  */
 930 static int inflate_gz_chunks(struct io_log *log, FILE *f)
 931 {
 932         struct inflate_chunk_iter iter = { .chunk_sz = log->log_gz, };
 933         z_stream stream;
 934
 935         while (!flist_empty(&log->chunk_list)) {
 936                 struct iolog_compress *ic;
 937
 938                 ic = flist_first_entry(&log->chunk_list, struct iolog_compress, list);
 939                 flist_del(&ic->list);
 940
 941                 if (log->log_gz_store) {
 942                         size_t ret;
 943
 944                         dprint(FD_COMPRESS, "log write chunk size=%lu, "
 945                                 "seq=%u\n", (unsigned long) ic->len, ic->seq);
 946
 947                         ret = fwrite(ic->buf, ic->len, 1, f);
 948                         if (ret != 1 || ferror(f)) {
 949                                 iter.err = errno;
 950                                 log_err("fio: error writing compressed log\n");
 951                         }
 952                 } else
 953                         inflate_chunk(ic, log->log_gz_store, f, &stream, &iter);
 954
 955                 free_chunk(ic);
 956         }
 957
 958         if (iter.seq) {
 959                 finish_chunk(&stream, f, &iter);
 960                 free(iter.buf);
 961         }
 962
 963         return iter.err;
 964 }
 965
 966 /*
 967  * Open compressed log file and decompress the stored chunks and
 968  * write them to stdout. The chunks are stored sequentially in the
 969  * file, so we iterate over them and do them one-by-one.
 970  */
 971 int iolog_file_inflate(const char *file)
 972 {
 973         struct inflate_chunk_iter iter = { .chunk_sz = 64 * 1024 * 1024, };
 974         struct iolog_compress ic;
 975         z_stream stream;
 976         struct stat sb;
 977         size_t ret;
 978         size_t total;
 979         void *buf;
 980         FILE *f;
 981
 982         f = fopen(file, "r");
 983         if (!f) {
 984                 perror("fopen");
 985                 return 1;
 986         }
 987
 988         if (stat(file, &sb) < 0) {
 989                 fclose(f);
 990                 perror("stat");
 991                 return 1;
 992         }
 993
 994         ic.buf = buf = malloc(sb.st_size);
 995         ic.len = sb.st_size;
 996         ic.seq = 1;
 997
 998         ret = fread(ic.buf, ic.len, 1, f);
 999         if (ret == 0 && ferror(f)) {
1000                 perror("fread");
1001                 fclose(f);
1002                 free(buf);
1003                 return 1;
1004         } else if (ferror(f) || (!feof(f) && ret != 1)) {
1005                 log_err("fio: short read on reading log\n");
1006                 fclose(f);
1007                 free(buf);
1008                 return 1;
1009         }
1010
1011         fclose(f);
1012
1013         /*
1014          * Each chunk will return Z_STREAM_END. We don't know how many
1015          * chunks are in the file, so we just keep looping and incrementing
1016          * the sequence number until we have consumed the whole compressed
1017          * file.
1018          */
1019         total = ic.len;
1020         do {
1021                 size_t iret;
1022
1023                 iret = inflate_chunk(&ic,  1, stdout, &stream, &iter);
1024                 total -= iret;
1025                 if (!total)
1026                         break;
1027                 if (iter.err)
1028                         break;
1029
1030                 ic.seq++;
1031                 ic.len -= iret;
1032                 ic.buf += iret;
1033         } while (1);
1034
1035         if (iter.seq) {
1036                 finish_chunk(&stream, stdout, &iter);
1037                 free(iter.buf);
1038         }
1039
1040         free(buf);
1041         return iter.err;
1042 }
1043
1044 #else
1045
1046 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1047 {
1048         return 0;
1049 }
1050
1051 int iolog_file_inflate(const char *file)
1052 {
1053         log_err("fio: log inflation not possible without zlib\n");
1054         return 1;
1055 }
1056
1057 #endif
1058
1059 void flush_log(struct io_log *log, bool do_append)
1060 {
1061         void *buf;
1062         FILE *f;
1063
1064         if (!do_append)
1065                 f = fopen(log->filename, "w");
1066         else
1067                 f = fopen(log->filename, "a");
1068         if (!f) {
1069                 perror("fopen log");
1070                 return;
1071         }
1072
1073         buf = set_file_buffer(f);
1074
1075         inflate_gz_chunks(log, f);
1076
1077         while (!flist_empty(&log->io_logs)) {
1078                 struct io_logs *cur_log;
1079
1080                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1081                 flist_del_init(&cur_log->list);
1082
1083                 if (log->td && log == log->td->clat_hist_log)
1084                         flush_hist_samples(f, log->hist_coarseness, cur_log->log,
1085                                            log_sample_sz(log, cur_log));
1086                 else
1087                         flush_samples(f, cur_log->log, log_sample_sz(log, cur_log));
1088
1089                 sfree(cur_log);
1090         }
1091
1092         fclose(f);
1093         clear_file_buffer(buf);
1094 }
1095
1096 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
1097 {
1098         if (td->flags & TD_F_COMPRESS_LOG)
1099                 iolog_flush(log);
1100
1101         if (trylock) {
1102                 if (fio_trylock_file(log->filename))
1103                         return 1;
1104         } else
1105                 fio_lock_file(log->filename);
1106
1107         if (td->client_type == FIO_CLIENT_TYPE_GUI || is_backend)
1108                 fio_send_iolog(td, log, log->filename);
1109         else
1110                 flush_log(log, !td->o.per_job_logs);
1111
1112         fio_unlock_file(log->filename);
1113         free_log(log);
1114         return 0;
1115 }
1116
1117 size_t log_chunk_sizes(struct io_log *log)
1118 {
1119         struct flist_head *entry;
1120         size_t ret;
1121
1122         if (flist_empty(&log->chunk_list))
1123                 return 0;
1124
1125         ret = 0;
1126         pthread_mutex_lock(&log->chunk_lock);
1127         flist_for_each(entry, &log->chunk_list) {
1128                 struct iolog_compress *c;
1129
1130                 c = flist_entry(entry, struct iolog_compress, list);
1131                 ret += c->len;
1132         }
1133         pthread_mutex_unlock(&log->chunk_lock);
1134         return ret;
1135 }
1136
1137 #ifdef CONFIG_ZLIB
1138
1139 static void iolog_put_deferred(struct io_log *log, void *ptr)
1140 {
1141         if (!ptr)
1142                 return;
1143
1144         pthread_mutex_lock(&log->deferred_free_lock);
1145         if (log->deferred < IOLOG_MAX_DEFER) {
1146                 log->deferred_items[log->deferred] = ptr;
1147                 log->deferred++;
1148         } else if (!fio_did_warn(FIO_WARN_IOLOG_DROP))
1149                 log_err("fio: had to drop log entry free\n");
1150         pthread_mutex_unlock(&log->deferred_free_lock);
1151 }
1152
1153 static void iolog_free_deferred(struct io_log *log)
1154 {
1155         int i;
1156
1157         if (!log->deferred)
1158                 return;
1159
1160         pthread_mutex_lock(&log->deferred_free_lock);
1161
1162         for (i = 0; i < log->deferred; i++) {
1163                 free(log->deferred_items[i]);
1164                 log->deferred_items[i] = NULL;
1165         }
1166
1167         log->deferred = 0;
1168         pthread_mutex_unlock(&log->deferred_free_lock);
1169 }
1170
1171 static int gz_work(struct iolog_flush_data *data)
1172 {
1173         struct iolog_compress *c = NULL;
1174         struct flist_head list;
1175         unsigned int seq;
1176         z_stream stream;
1177         size_t total = 0;
1178         int ret;
1179
1180         INIT_FLIST_HEAD(&list);
1181
1182         memset(&stream, 0, sizeof(stream));
1183         stream.zalloc = Z_NULL;
1184         stream.zfree = Z_NULL;
1185         stream.opaque = Z_NULL;
1186
1187         ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
1188         if (ret != Z_OK) {
1189                 log_err("fio: failed to init gz stream\n");
1190                 goto err;
1191         }
1192
1193         seq = ++data->log->chunk_seq;
1194
1195         stream.next_in = (void *) data->samples;
1196         stream.avail_in = data->nr_samples * log_entry_sz(data->log);
1197
1198         dprint(FD_COMPRESS, "deflate input size=%lu, seq=%u, log=%s\n",
1199                                 (unsigned long) stream.avail_in, seq,
1200                                 data->log->filename);
1201         do {
1202                 if (c)
1203                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1204                                 (unsigned long) c->len);
1205                 c = get_new_chunk(seq);
1206                 stream.avail_out = GZ_CHUNK;
1207                 stream.next_out = c->buf;
1208                 ret = deflate(&stream, Z_NO_FLUSH);
1209                 if (ret < 0) {
1210                         log_err("fio: deflate log (%d)\n", ret);
1211                         free_chunk(c);
1212                         goto err;
1213                 }
1214
1215                 c->len = GZ_CHUNK - stream.avail_out;
1216                 flist_add_tail(&c->list, &list);
1217                 total += c->len;
1218         } while (stream.avail_in);
1219
1220         stream.next_out = c->buf + c->len;
1221         stream.avail_out = GZ_CHUNK - c->len;
1222
1223         ret = deflate(&stream, Z_FINISH);
1224         if (ret < 0) {
1225                 /*
1226                  * Z_BUF_ERROR is special, it just means we need more
1227                  * output space. We'll handle that below. Treat any other
1228                  * error as fatal.
1229                  */
1230                 if (ret != Z_BUF_ERROR) {
1231                         log_err("fio: deflate log (%d)\n", ret);
1232                         flist_del(&c->list);
1233                         free_chunk(c);
1234                         goto err;
1235                 }
1236         }
1237
1238         total -= c->len;
1239         c->len = GZ_CHUNK - stream.avail_out;
1240         total += c->len;
1241         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, (unsigned long) c->len);
1242
1243         if (ret != Z_STREAM_END) {
1244                 do {
1245                         c = get_new_chunk(seq);
1246                         stream.avail_out = GZ_CHUNK;
1247                         stream.next_out = c->buf;
1248                         ret = deflate(&stream, Z_FINISH);
1249                         c->len = GZ_CHUNK - stream.avail_out;
1250                         total += c->len;
1251                         flist_add_tail(&c->list, &list);
1252                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1253                                 (unsigned long) c->len);
1254                 } while (ret != Z_STREAM_END);
1255         }
1256
1257         dprint(FD_COMPRESS, "deflated to size=%lu\n", (unsigned long) total);
1258
1259         ret = deflateEnd(&stream);
1260         if (ret != Z_OK)
1261                 log_err("fio: deflateEnd %d\n", ret);
1262
1263         iolog_put_deferred(data->log, data->samples);
1264
1265         if (!flist_empty(&list)) {
1266                 pthread_mutex_lock(&data->log->chunk_lock);
1267                 flist_splice_tail(&list, &data->log->chunk_list);
1268                 pthread_mutex_unlock(&data->log->chunk_lock);
1269         }
1270
1271         ret = 0;
1272 done:
1273         if (data->free)
1274                 sfree(data);
1275         return ret;
1276 err:
1277         while (!flist_empty(&list)) {
1278                 c = flist_first_entry(list.next, struct iolog_compress, list);
1279                 flist_del(&c->list);
1280                 free_chunk(c);
1281         }
1282         ret = 1;
1283         goto done;
1284 }
1285
1286 /*
1287  * Invoked from our compress helper thread, when logging would have exceeded
1288  * the specified memory limitation. Compresses the previously stored
1289  * entries.
1290  */
1291 static int gz_work_async(struct submit_worker *sw, struct workqueue_work *work)
1292 {
1293         return gz_work(container_of(work, struct iolog_flush_data, work));
1294 }
1295
1296 static int gz_init_worker(struct submit_worker *sw)
1297 {
1298         struct thread_data *td = sw->wq->td;
1299
1300         if (!fio_option_is_set(&td->o, log_gz_cpumask))
1301                 return 0;
1302
1303         if (fio_setaffinity(gettid(), td->o.log_gz_cpumask) == -1) {
1304                 log_err("gz: failed to set CPU affinity\n");
1305                 return 1;
1306         }
1307
1308         return 0;
1309 }
1310
1311 static struct workqueue_ops log_compress_wq_ops = {
1312         .fn             = gz_work_async,
1313         .init_worker_fn = gz_init_worker,
1314         .nice           = 1,
1315 };
1316
1317 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1318 {
1319         if (!(td->flags & TD_F_COMPRESS_LOG))
1320                 return 0;
1321
1322         workqueue_init(td, &td->log_compress_wq, &log_compress_wq_ops, 1, sk_out);
1323         return 0;
1324 }
1325
1326 void iolog_compress_exit(struct thread_data *td)
1327 {
1328         if (!(td->flags & TD_F_COMPRESS_LOG))
1329                 return;
1330
1331         workqueue_exit(&td->log_compress_wq);
1332 }
1333
1334 /*
1335  * Queue work item to compress the existing log entries. We reset the
1336  * current log to a small size, and reference the existing log in the
1337  * data that we queue for compression. Once compression has been done,
1338  * this old log is freed. If called with finish == true, will not return
1339  * until the log compression has completed, and will flush all previous
1340  * logs too
1341  */
1342 static int iolog_flush(struct io_log *log)
1343 {
1344         struct iolog_flush_data *data;
1345
1346         data = malloc(sizeof(*data));
1347         if (!data)
1348                 return 1;
1349
1350         data->log = log;
1351         data->free = false;
1352
1353         while (!flist_empty(&log->io_logs)) {
1354                 struct io_logs *cur_log;
1355
1356                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1357                 flist_del_init(&cur_log->list);
1358
1359                 data->samples = cur_log->log;
1360                 data->nr_samples = cur_log->nr_samples;
1361
1362                 sfree(cur_log);
1363
1364                 gz_work(data);
1365         }
1366
1367         free(data);
1368         return 0;
1369 }
1370
1371 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1372 {
1373         struct iolog_flush_data *data;
1374
1375         data = smalloc(sizeof(*data));
1376         if (!data)
1377                 return 1;
1378
1379         data->log = log;
1380
1381         data->samples = cur_log->log;
1382         data->nr_samples = cur_log->nr_samples;
1383         data->free = true;
1384
1385         cur_log->nr_samples = cur_log->max_samples = 0;
1386         cur_log->log = NULL;
1387
1388         workqueue_enqueue(&log->td->log_compress_wq, &data->work);
1389
1390         iolog_free_deferred(log);
1391
1392         return 0;
1393 }
1394 #else
1395
1396 static int iolog_flush(struct io_log *log)
1397 {
1398         return 1;
1399 }
1400
1401 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1402 {
1403         return 1;
1404 }
1405
1406 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1407 {
1408         return 0;
1409 }
1410
1411 void iolog_compress_exit(struct thread_data *td)
1412 {
1413 }
1414
1415 #endif
1416
1417 struct io_logs *iolog_cur_log(struct io_log *log)
1418 {
1419         if (flist_empty(&log->io_logs))
1420                 return NULL;
1421
1422         return flist_last_entry(&log->io_logs, struct io_logs, list);
1423 }
1424
1425 uint64_t iolog_nr_samples(struct io_log *iolog)
1426 {
1427         struct flist_head *entry;
1428         uint64_t ret = 0;
1429
1430         flist_for_each(entry, &iolog->io_logs) {
1431                 struct io_logs *cur_log;
1432
1433                 cur_log = flist_entry(entry, struct io_logs, list);
1434                 ret += cur_log->nr_samples;
1435         }
1436
1437         return ret;
1438 }
1439
1440 static int __write_log(struct thread_data *td, struct io_log *log, int try)
1441 {
1442         if (log)
1443                 return finish_log(td, log, try);
1444
1445         return 0;
1446 }
1447
1448 static int write_iops_log(struct thread_data *td, int try, bool unit_log)
1449 {
1450         int ret;
1451
1452         if (per_unit_log(td->iops_log) != unit_log)
1453                 return 0;
1454
1455         ret = __write_log(td, td->iops_log, try);
1456         if (!ret)
1457                 td->iops_log = NULL;
1458
1459         return ret;
1460 }
1461
1462 static int write_slat_log(struct thread_data *td, int try, bool unit_log)
1463 {
1464         int ret;
1465
1466         if (!unit_log)
1467                 return 0;
1468
1469         ret = __write_log(td, td->slat_log, try);
1470         if (!ret)
1471                 td->slat_log = NULL;
1472
1473         return ret;
1474 }
1475
1476 static int write_clat_log(struct thread_data *td, int try, bool unit_log)
1477 {
1478         int ret;
1479
1480         if (!unit_log)
1481                 return 0;
1482
1483         ret = __write_log(td, td->clat_log, try);
1484         if (!ret)
1485                 td->clat_log = NULL;
1486
1487         return ret;
1488 }
1489
1490 static int write_clat_hist_log(struct thread_data *td, int try, bool unit_log)
1491 {
1492         int ret;
1493
1494         if (!unit_log)
1495                 return 0;
1496
1497         ret = __write_log(td, td->clat_hist_log, try);
1498         if (!ret)
1499                 td->clat_hist_log = NULL;
1500
1501         return ret;
1502 }
1503
1504 static int write_lat_log(struct thread_data *td, int try, bool unit_log)
1505 {
1506         int ret;
1507
1508         if (!unit_log)
1509                 return 0;
1510
1511         ret = __write_log(td, td->lat_log, try);
1512         if (!ret)
1513                 td->lat_log = NULL;
1514
1515         return ret;
1516 }
1517
1518 static int write_bandw_log(struct thread_data *td, int try, bool unit_log)
1519 {
1520         int ret;
1521
1522         if (per_unit_log(td->bw_log) != unit_log)
1523                 return 0;
1524
1525         ret = __write_log(td, td->bw_log, try);
1526         if (!ret)
1527                 td->bw_log = NULL;
1528
1529         return ret;
1530 }
1531
1532 enum {
1533         BW_LOG_MASK     = 1,
1534         LAT_LOG_MASK    = 2,
1535         SLAT_LOG_MASK   = 4,
1536         CLAT_LOG_MASK   = 8,
1537         IOPS_LOG_MASK   = 16,
1538         CLAT_HIST_LOG_MASK = 32,
1539
1540         ALL_LOG_NR      = 6,
1541 };
1542
1543 struct log_type {
1544         unsigned int mask;
1545         int (*fn)(struct thread_data *, int, bool);
1546 };
1547
1548 static struct log_type log_types[] = {
1549         {
1550                 .mask   = BW_LOG_MASK,
1551                 .fn     = write_bandw_log,
1552         },
1553         {
1554                 .mask   = LAT_LOG_MASK,
1555                 .fn     = write_lat_log,
1556         },
1557         {
1558                 .mask   = SLAT_LOG_MASK,
1559                 .fn     = write_slat_log,
1560         },
1561         {
1562                 .mask   = CLAT_LOG_MASK,
1563                 .fn     = write_clat_log,
1564         },
1565         {
1566                 .mask   = IOPS_LOG_MASK,
1567                 .fn     = write_iops_log,
1568         },
1569         {
1570                 .mask   = CLAT_HIST_LOG_MASK,
1571                 .fn     = write_clat_hist_log,
1572         }
1573 };
1574
1575 void td_writeout_logs(struct thread_data *td, bool unit_logs)
1576 {
1577         unsigned int log_mask = 0;
1578         unsigned int log_left = ALL_LOG_NR;
1579         int old_state, i;
1580
1581         old_state = td_bump_runstate(td, TD_FINISHING);
1582
1583         finalize_logs(td, unit_logs);
1584
1585         while (log_left) {
1586                 int prev_log_left = log_left;
1587
1588                 for (i = 0; i < ALL_LOG_NR && log_left; i++) {
1589                         struct log_type *lt = &log_types[i];
1590                         int ret;
1591
1592                         if (!(log_mask & lt->mask)) {
1593                                 ret = lt->fn(td, log_left != 1, unit_logs);
1594                                 if (!ret) {
1595                                         log_left--;
1596                                         log_mask |= lt->mask;
1597                                 }
1598                         }
1599                 }
1600
1601                 if (prev_log_left == log_left)
1602                         usleep(5000);
1603         }
1604
1605         td_restore_runstate(td, old_state);
1606 }
1607
1608 void fio_writeout_logs(bool unit_logs)
1609 {
1610         struct thread_data *td;
1611         int i;
1612
1613         for_each_td(td, i)
1614                 td_writeout_logs(td, unit_logs);
1615 }