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 #include <netinet/in.h>
  24 #include <netinet/tcp.h>
  25 #include <arpa/inet.h>
  26 #include <sys/stat.h>
  27 #include <sys/socket.h>
  28 #include <sys/un.h>
  29
  30 static int iolog_flush(struct io_log *log);
  31
  32 static const char iolog_ver2[] = "fio version 2 iolog";
  33
  34 void queue_io_piece(struct thread_data *td, struct io_piece *ipo)
  35 {
  36         flist_add_tail(&ipo->list, &td->io_log_list);
  37         td->total_io_size += ipo->len;
  38 }
  39
  40 void log_io_u(const struct thread_data *td, const struct io_u *io_u)
  41 {
  42         if (!td->o.write_iolog_file)
  43                 return;
  44
  45         fprintf(td->iolog_f, "%s %s %llu %llu\n", io_u->file->file_name,
  46                                                 io_ddir_name(io_u->ddir),
  47                                                 io_u->offset, io_u->buflen);
  48 }
  49
  50 void log_file(struct thread_data *td, struct fio_file *f,
  51               enum file_log_act what)
  52 {
  53         const char *act[] = { "add", "open", "close" };
  54
  55         assert(what < 3);
  56
  57         if (!td->o.write_iolog_file)
  58                 return;
  59
  60
  61         /*
  62          * this happens on the pre-open/close done before the job starts
  63          */
  64         if (!td->iolog_f)
  65                 return;
  66
  67         fprintf(td->iolog_f, "%s %s\n", f->file_name, act[what]);
  68 }
  69
  70 static void iolog_delay(struct thread_data *td, unsigned long delay)
  71 {
  72         uint64_t usec = utime_since_now(&td->last_issue);
  73         unsigned long orig_delay = delay;
  74         uint64_t this_delay;
  75         struct timespec ts;
  76
  77         if (delay < td->time_offset) {
  78                 td->time_offset = 0;
  79                 return;
  80         }
  81
  82         delay -= td->time_offset;
  83         if (delay < usec)
  84                 return;
  85
  86         delay -= usec;
  87
  88         fio_gettime(&ts, NULL);
  89         while (delay && !td->terminate) {
  90                 this_delay = delay;
  91                 if (this_delay > 500000)
  92                         this_delay = 500000;
  93
  94                 usec_sleep(td, this_delay);
  95                 delay -= this_delay;
  96         }
  97
  98         usec = utime_since_now(&ts);
  99         if (usec > orig_delay)
 100                 td->time_offset = usec - orig_delay;
 101         else
 102                 td->time_offset = 0;
 103 }
 104
 105 static int ipo_special(struct thread_data *td, struct io_piece *ipo)
 106 {
 107         struct fio_file *f;
 108         int ret;
 109
 110         /*
 111          * Not a special ipo
 112          */
 113         if (ipo->ddir != DDIR_INVAL)
 114                 return 0;
 115
 116         f = td->files[ipo->fileno];
 117
 118         switch (ipo->file_action) {
 119         case FIO_LOG_OPEN_FILE:
 120                 if (td->o.replay_redirect && fio_file_open(f)) {
 121                         dprint(FD_FILE, "iolog: ignoring re-open of file %s\n",
 122                                         f->file_name);
 123                         break;
 124                 }
 125                 ret = td_io_open_file(td, f);
 126                 if (!ret)
 127                         break;
 128                 td_verror(td, ret, "iolog open file");
 129                 return -1;
 130         case FIO_LOG_CLOSE_FILE:
 131                 td_io_close_file(td, f);
 132                 break;
 133         case FIO_LOG_UNLINK_FILE:
 134                 td_io_unlink_file(td, f);
 135                 break;
 136         default:
 137                 log_err("fio: bad file action %d\n", ipo->file_action);
 138                 break;
 139         }
 140
 141         return 1;
 142 }
 143
 144 static bool read_iolog2(struct thread_data *td);
 145
 146 int read_iolog_get(struct thread_data *td, struct io_u *io_u)
 147 {
 148         struct io_piece *ipo;
 149         unsigned long elapsed;
 150
 151         while (!flist_empty(&td->io_log_list)) {
 152                 int ret;
 153                 if (td->o.read_iolog_chunked) {
 154                         if (td->io_log_checkmark == td->io_log_current) {
 155                                 if (!read_iolog2(td))
 156                                         return 1;
 157                         }
 158                         td->io_log_current--;
 159                 }
 160                 ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
 161                 flist_del(&ipo->list);
 162                 remove_trim_entry(td, ipo);
 163
 164                 ret = ipo_special(td, ipo);
 165                 if (ret < 0) {
 166                         free(ipo);
 167                         break;
 168                 } else if (ret > 0) {
 169                         free(ipo);
 170                         continue;
 171                 }
 172
 173                 io_u->ddir = ipo->ddir;
 174                 if (ipo->ddir != DDIR_WAIT) {
 175                         io_u->offset = ipo->offset;
 176                         io_u->buflen = ipo->len;
 177                         io_u->file = td->files[ipo->fileno];
 178                         get_file(io_u->file);
 179                         dprint(FD_IO, "iolog: get %llu/%llu/%s\n", io_u->offset,
 180                                                 io_u->buflen, io_u->file->file_name);
 181                         if (ipo->delay)
 182                                 iolog_delay(td, ipo->delay);
 183                 } else {
 184                         elapsed = mtime_since_genesis();
 185                         if (ipo->delay > elapsed)
 186                                 usec_sleep(td, (ipo->delay - elapsed) * 1000);
 187                 }
 188
 189                 free(ipo);
 190
 191                 if (io_u->ddir != DDIR_WAIT)
 192                         return 0;
 193         }
 194
 195         td->done = 1;
 196         return 1;
 197 }
 198
 199 void prune_io_piece_log(struct thread_data *td)
 200 {
 201         struct io_piece *ipo;
 202         struct fio_rb_node *n;
 203
 204         while ((n = rb_first(&td->io_hist_tree)) != NULL) {
 205                 ipo = rb_entry(n, struct io_piece, rb_node);
 206                 rb_erase(n, &td->io_hist_tree);
 207                 remove_trim_entry(td, ipo);
 208                 td->io_hist_len--;
 209                 free(ipo);
 210         }
 211
 212         while (!flist_empty(&td->io_hist_list)) {
 213                 ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
 214                 flist_del(&ipo->list);
 215                 remove_trim_entry(td, ipo);
 216                 td->io_hist_len--;
 217                 free(ipo);
 218         }
 219 }
 220
 221 /*
 222  * log a successful write, so we can unwind the log for verify
 223  */
 224 void log_io_piece(struct thread_data *td, struct io_u *io_u)
 225 {
 226         struct fio_rb_node **p, *parent;
 227         struct io_piece *ipo, *__ipo;
 228
 229         ipo = calloc(1, sizeof(struct io_piece));
 230         init_ipo(ipo);
 231         ipo->file = io_u->file;
 232         ipo->offset = io_u->offset;
 233         ipo->len = io_u->buflen;
 234         ipo->numberio = io_u->numberio;
 235         ipo->flags = IP_F_IN_FLIGHT;
 236
 237         io_u->ipo = ipo;
 238
 239         if (io_u_should_trim(td, io_u)) {
 240                 flist_add_tail(&ipo->trim_list, &td->trim_list);
 241                 td->trim_entries++;
 242         }
 243
 244         /*
 245          * Only sort writes if we don't have a random map in which case we need
 246          * to check for duplicate blocks and drop the old one, which we rely on
 247          * the rb insert/lookup for handling.
 248          */
 249         if (file_randommap(td, ipo->file)) {
 250                 INIT_FLIST_HEAD(&ipo->list);
 251                 flist_add_tail(&ipo->list, &td->io_hist_list);
 252                 ipo->flags |= IP_F_ONLIST;
 253                 td->io_hist_len++;
 254                 return;
 255         }
 256
 257         RB_CLEAR_NODE(&ipo->rb_node);
 258
 259         /*
 260          * Sort the entry into the verification list
 261          */
 262 restart:
 263         p = &td->io_hist_tree.rb_node;
 264         parent = NULL;
 265         while (*p) {
 266                 int overlap = 0;
 267                 parent = *p;
 268
 269                 __ipo = rb_entry(parent, struct io_piece, rb_node);
 270                 if (ipo->file < __ipo->file)
 271                         p = &(*p)->rb_left;
 272                 else if (ipo->file > __ipo->file)
 273                         p = &(*p)->rb_right;
 274                 else if (ipo->offset < __ipo->offset) {
 275                         p = &(*p)->rb_left;
 276                         overlap = ipo->offset + ipo->len > __ipo->offset;
 277                 }
 278                 else if (ipo->offset > __ipo->offset) {
 279                         p = &(*p)->rb_right;
 280                         overlap = __ipo->offset + __ipo->len > ipo->offset;
 281                 }
 282                 else
 283                         overlap = 1;
 284
 285                 if (overlap) {
 286                         dprint(FD_IO, "iolog: overlap %llu/%lu, %llu/%lu\n",
 287                                 __ipo->offset, __ipo->len,
 288                                 ipo->offset, ipo->len);
 289                         td->io_hist_len--;
 290                         rb_erase(parent, &td->io_hist_tree);
 291                         remove_trim_entry(td, __ipo);
 292                         if (!(__ipo->flags & IP_F_IN_FLIGHT))
 293                                 free(__ipo);
 294                         goto restart;
 295                 }
 296         }
 297
 298         rb_link_node(&ipo->rb_node, parent, p);
 299         rb_insert_color(&ipo->rb_node, &td->io_hist_tree);
 300         ipo->flags |= IP_F_ONRB;
 301         td->io_hist_len++;
 302 }
 303
 304 void unlog_io_piece(struct thread_data *td, struct io_u *io_u)
 305 {
 306         struct io_piece *ipo = io_u->ipo;
 307
 308         if (td->ts.nr_block_infos) {
 309                 uint32_t *info = io_u_block_info(td, io_u);
 310                 if (BLOCK_INFO_STATE(*info) < BLOCK_STATE_TRIM_FAILURE) {
 311                         if (io_u->ddir == DDIR_TRIM)
 312                                 *info = BLOCK_INFO_SET_STATE(*info,
 313                                                 BLOCK_STATE_TRIM_FAILURE);
 314                         else if (io_u->ddir == DDIR_WRITE)
 315                                 *info = BLOCK_INFO_SET_STATE(*info,
 316                                                 BLOCK_STATE_WRITE_FAILURE);
 317                 }
 318         }
 319
 320         if (!ipo)
 321                 return;
 322
 323         if (ipo->flags & IP_F_ONRB)
 324                 rb_erase(&ipo->rb_node, &td->io_hist_tree);
 325         else if (ipo->flags & IP_F_ONLIST)
 326                 flist_del(&ipo->list);
 327
 328         free(ipo);
 329         io_u->ipo = NULL;
 330         td->io_hist_len--;
 331 }
 332
 333 void trim_io_piece(const struct io_u *io_u)
 334 {
 335         struct io_piece *ipo = io_u->ipo;
 336
 337         if (!ipo)
 338                 return;
 339
 340         ipo->len = io_u->xfer_buflen - io_u->resid;
 341 }
 342
 343 void write_iolog_close(struct thread_data *td)
 344 {
 345         fflush(td->iolog_f);
 346         fclose(td->iolog_f);
 347         free(td->iolog_buf);
 348         td->iolog_f = NULL;
 349         td->iolog_buf = NULL;
 350 }
 351
 352 static int64_t iolog_items_to_fetch(struct thread_data *td)
 353 {
 354         struct timespec now;
 355         uint64_t elapsed;
 356         uint64_t for_1s;
 357         int64_t items_to_fetch;
 358
 359         if (!td->io_log_highmark)
 360                 return 10;
 361
 362
 363         fio_gettime(&now, NULL);
 364         elapsed = ntime_since(&td->io_log_highmark_time, &now);
 365         if (elapsed) {
 366                 for_1s = (td->io_log_highmark - td->io_log_current) * 1000000000 / elapsed;
 367                 items_to_fetch = for_1s - td->io_log_current;
 368                 if (items_to_fetch < 0)
 369                         items_to_fetch = 0;
 370         } else
 371                 items_to_fetch = 0;
 372
 373         td->io_log_highmark = td->io_log_current + items_to_fetch;
 374         td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
 375         fio_gettime(&td->io_log_highmark_time, NULL);
 376
 377         return items_to_fetch;
 378 }
 379
 380 /*
 381  * Read version 2 iolog data. It is enhanced to include per-file logging,
 382  * syncs, etc.
 383  */
 384 static bool read_iolog2(struct thread_data *td)
 385 {
 386         unsigned long long offset;
 387         unsigned int bytes;
 388         int reads, writes, waits, fileno = 0, file_action = 0; /* stupid gcc */
 389         char *rfname, *fname, *act;
 390         char *str, *p;
 391         enum fio_ddir rw;
 392         bool realloc = false;
 393         int64_t items_to_fetch = 0;
 394
 395         if (td->o.read_iolog_chunked) {
 396                 items_to_fetch = iolog_items_to_fetch(td);
 397                 if (!items_to_fetch)
 398                         return true;
 399         }
 400
 401         /*
 402          * Read in the read iolog and store it, reuse the infrastructure
 403          * for doing verifications.
 404          */
 405         str = malloc(4096);
 406         rfname = fname = malloc(256+16);
 407         act = malloc(256+16);
 408
 409         reads = writes = waits = 0;
 410         while ((p = fgets(str, 4096, td->io_log_rfile)) != NULL) {
 411                 struct io_piece *ipo;
 412                 int r;
 413
 414                 r = sscanf(p, "%256s %256s %llu %u", rfname, act, &offset,
 415                                                                         &bytes);
 416
 417                 if (td->o.replay_redirect)
 418                         fname = td->o.replay_redirect;
 419
 420                 if (r == 4) {
 421                         /*
 422                          * Check action first
 423                          */
 424                         if (!strcmp(act, "wait"))
 425                                 rw = DDIR_WAIT;
 426                         else if (!strcmp(act, "read"))
 427                                 rw = DDIR_READ;
 428                         else if (!strcmp(act, "write"))
 429                                 rw = DDIR_WRITE;
 430                         else if (!strcmp(act, "sync"))
 431                                 rw = DDIR_SYNC;
 432                         else if (!strcmp(act, "datasync"))
 433                                 rw = DDIR_DATASYNC;
 434                         else if (!strcmp(act, "trim"))
 435                                 rw = DDIR_TRIM;
 436                         else {
 437                                 log_err("fio: bad iolog file action: %s\n",
 438                                                                         act);
 439                                 continue;
 440                         }
 441                         fileno = get_fileno(td, fname);
 442                 } else if (r == 2) {
 443                         rw = DDIR_INVAL;
 444                         if (!strcmp(act, "add")) {
 445                                 if (td->o.replay_redirect &&
 446                                     get_fileno(td, fname) != -1) {
 447                                         dprint(FD_FILE, "iolog: ignoring"
 448                                                 " re-add of file %s\n", fname);
 449                                 } else {
 450                                         fileno = add_file(td, fname, td->subjob_number, 1);
 451                                         file_action = FIO_LOG_ADD_FILE;
 452                                 }
 453                                 continue;
 454                         } else if (!strcmp(act, "open")) {
 455                                 fileno = get_fileno(td, fname);
 456                                 file_action = FIO_LOG_OPEN_FILE;
 457                         } else if (!strcmp(act, "close")) {
 458                                 fileno = get_fileno(td, fname);
 459                                 file_action = FIO_LOG_CLOSE_FILE;
 460                         } else {
 461                                 log_err("fio: bad iolog file action: %s\n",
 462                                                                         act);
 463                                 continue;
 464                         }
 465                 } else {
 466                         log_err("bad iolog2: %s\n", p);
 467                         continue;
 468                 }
 469
 470                 if (rw == DDIR_READ)
 471                         reads++;
 472                 else if (rw == DDIR_WRITE) {
 473                         /*
 474                          * Don't add a write for ro mode
 475                          */
 476                         if (read_only)
 477                                 continue;
 478                         writes++;
 479                 } else if (rw == DDIR_WAIT) {
 480                         if (td->o.no_stall)
 481                                 continue;
 482                         waits++;
 483                 } else if (rw == DDIR_INVAL) {
 484                 } else if (!ddir_sync(rw)) {
 485                         log_err("bad ddir: %d\n", rw);
 486                         continue;
 487                 }
 488
 489                 /*
 490                  * Make note of file
 491                  */
 492                 ipo = calloc(1, sizeof(*ipo));
 493                 init_ipo(ipo);
 494                 ipo->ddir = rw;
 495                 if (rw == DDIR_WAIT) {
 496                         ipo->delay = offset;
 497                 } else {
 498                         if (td->o.replay_scale)
 499                                 ipo->offset = offset / td->o.replay_scale;
 500                         else
 501                                 ipo->offset = offset;
 502                         ipo_bytes_align(td->o.replay_align, ipo);
 503
 504                         ipo->len = bytes;
 505                         if (rw != DDIR_INVAL && bytes > td->o.max_bs[rw]) {
 506                                 realloc = true;
 507                                 td->o.max_bs[rw] = bytes;
 508                         }
 509                         ipo->fileno = fileno;
 510                         ipo->file_action = file_action;
 511                         td->o.size += bytes;
 512                 }
 513
 514                 queue_io_piece(td, ipo);
 515
 516                 if (td->o.read_iolog_chunked) {
 517                         td->io_log_current++;
 518                         items_to_fetch--;
 519                         if (items_to_fetch == 0)
 520                                 break;
 521                 }
 522         }
 523
 524         free(str);
 525         free(act);
 526         free(rfname);
 527
 528         if (td->o.read_iolog_chunked) {
 529                 td->io_log_highmark = td->io_log_current;
 530                 td->io_log_checkmark = (td->io_log_highmark + 1) / 2;
 531                 fio_gettime(&td->io_log_highmark_time, NULL);
 532         }
 533
 534         if (writes && read_only) {
 535                 log_err("fio: <%s> skips replay of %d writes due to"
 536                         " read-only\n", td->o.name, writes);
 537                 writes = 0;
 538         }
 539
 540         if (td->o.read_iolog_chunked) {
 541                 if (td->io_log_current == 0) {
 542                         return false;
 543                 }
 544                 td->o.td_ddir = TD_DDIR_RW;
 545                 if (realloc && td->orig_buffer)
 546                 {
 547                         io_u_quiesce(td);
 548                         free_io_mem(td);
 549                         init_io_u_buffers(td);
 550                 }
 551                 return true;
 552         }
 553
 554         if (!reads && !writes && !waits)
 555                 return false;
 556         else if (reads && !writes)
 557                 td->o.td_ddir = TD_DDIR_READ;
 558         else if (!reads && writes)
 559                 td->o.td_ddir = TD_DDIR_WRITE;
 560         else
 561                 td->o.td_ddir = TD_DDIR_RW;
 562
 563         return true;
 564 }
 565
 566 static bool is_socket(const char *path)
 567 {
 568         struct stat buf;
 569         int r;
 570
 571         r = stat(path, &buf);
 572         if (r == -1)
 573                 return false;
 574
 575         return S_ISSOCK(buf.st_mode);
 576 }
 577
 578 static int open_socket(const char *path)
 579 {
 580         struct sockaddr_un addr;
 581         int ret, fd;
 582
 583         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 584         if (fd < 0)
 585                 return fd;
 586
 587         addr.sun_family = AF_UNIX;
 588         if (snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", path) >=
 589             sizeof(addr.sun_path)) {
 590                 log_err("%s: path name %s is too long for a Unix socket\n",
 591                         __func__, path);
 592         }
 593
 594         ret = connect(fd, (const struct sockaddr *)&addr, strlen(path) + sizeof(addr.sun_family));
 595         if (!ret)
 596                 return fd;
 597
 598         close(fd);
 599         return -1;
 600 }
 601
 602 /*
 603  * open iolog, check version, and call appropriate parser
 604  */
 605 static bool init_iolog_read(struct thread_data *td)
 606 {
 607         char buffer[256], *p, *fname;
 608         FILE *f = NULL;
 609
 610         fname = get_name_by_idx(td->o.read_iolog_file, td->subjob_number);
 611         dprint(FD_IO, "iolog: name=%s\n", fname);
 612
 613         if (is_socket(fname)) {
 614                 int fd;
 615
 616                 fd = open_socket(fname);
 617                 if (fd >= 0)
 618                         f = fdopen(fd, "r");
 619         } else
 620                 f = fopen(fname, "r");
 621
 622         free(fname);
 623
 624         if (!f) {
 625                 perror("fopen read iolog");
 626                 return false;
 627         }
 628
 629         p = fgets(buffer, sizeof(buffer), f);
 630         if (!p) {
 631                 td_verror(td, errno, "iolog read");
 632                 log_err("fio: unable to read iolog\n");
 633                 fclose(f);
 634                 return false;
 635         }
 636
 637         /*
 638          * version 2 of the iolog stores a specific string as the
 639          * first line, check for that
 640          */
 641         if (!strncmp(iolog_ver2, buffer, strlen(iolog_ver2))) {
 642                 free_release_files(td);
 643                 td->io_log_rfile = f;
 644                 return read_iolog2(td);
 645         }
 646
 647         log_err("fio: iolog version 1 is no longer supported\n");
 648         fclose(f);
 649         return false;
 650 }
 651
 652 /*
 653  * Set up a log for storing io patterns.
 654  */
 655 static bool init_iolog_write(struct thread_data *td)
 656 {
 657         struct fio_file *ff;
 658         FILE *f;
 659         unsigned int i;
 660
 661         f = fopen(td->o.write_iolog_file, "a");
 662         if (!f) {
 663                 perror("fopen write iolog");
 664                 return false;
 665         }
 666
 667         /*
 668          * That's it for writing, setup a log buffer and we're done.
 669           */
 670         td->iolog_f = f;
 671         td->iolog_buf = malloc(8192);
 672         setvbuf(f, td->iolog_buf, _IOFBF, 8192);
 673
 674         /*
 675          * write our version line
 676          */
 677         if (fprintf(f, "%s\n", iolog_ver2) < 0) {
 678                 perror("iolog init\n");
 679                 return false;
 680         }
 681
 682         /*
 683          * add all known files
 684          */
 685         for_each_file(td, ff, i)
 686                 log_file(td, ff, FIO_LOG_ADD_FILE);
 687
 688         return true;
 689 }
 690
 691 bool init_iolog(struct thread_data *td)
 692 {
 693         bool ret;
 694
 695         if (td->o.read_iolog_file) {
 696                 int need_swap;
 697
 698                 /*
 699                  * Check if it's a blktrace file and load that if possible.
 700                  * Otherwise assume it's a normal log file and load that.
 701                  */
 702                 if (is_blktrace(td->o.read_iolog_file, &need_swap))
 703                         ret = load_blktrace(td, td->o.read_iolog_file, need_swap);
 704                 else
 705                         ret = init_iolog_read(td);
 706         } else if (td->o.write_iolog_file)
 707                 ret = init_iolog_write(td);
 708         else
 709                 ret = true;
 710
 711         if (!ret)
 712                 td_verror(td, EINVAL, "failed initializing iolog");
 713
 714         return ret;
 715 }
 716
 717 void setup_log(struct io_log **log, struct log_params *p,
 718                const char *filename)
 719 {
 720         struct io_log *l;
 721         int i;
 722         struct io_u_plat_entry *entry;
 723         struct flist_head *list;
 724
 725         l = scalloc(1, sizeof(*l));
 726         INIT_FLIST_HEAD(&l->io_logs);
 727         l->log_type = p->log_type;
 728         l->log_offset = p->log_offset;
 729         l->log_gz = p->log_gz;
 730         l->log_gz_store = p->log_gz_store;
 731         l->avg_msec = p->avg_msec;
 732         l->hist_msec = p->hist_msec;
 733         l->hist_coarseness = p->hist_coarseness;
 734         l->filename = strdup(filename);
 735         l->td = p->td;
 736
 737         /* Initialize histogram lists for each r/w direction,
 738          * with initial io_u_plat of all zeros:
 739          */
 740         for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 741                 list = &l->hist_window[i].list;
 742                 INIT_FLIST_HEAD(list);
 743                 entry = calloc(1, sizeof(struct io_u_plat_entry));
 744                 flist_add(&entry->list, list);
 745         }
 746
 747         if (l->td && l->td->o.io_submit_mode != IO_MODE_OFFLOAD) {
 748                 struct io_logs *__p;
 749
 750                 __p = calloc(1, sizeof(*l->pending));
 751                 __p->max_samples = DEF_LOG_ENTRIES;
 752                 __p->log = calloc(__p->max_samples, log_entry_sz(l));
 753                 l->pending = __p;
 754         }
 755
 756         if (l->log_offset)
 757                 l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
 758
 759         INIT_FLIST_HEAD(&l->chunk_list);
 760
 761         if (l->log_gz && !p->td)
 762                 l->log_gz = 0;
 763         else if (l->log_gz || l->log_gz_store) {
 764                 mutex_init_pshared(&l->chunk_lock);
 765                 mutex_init_pshared(&l->deferred_free_lock);
 766                 p->td->flags |= TD_F_COMPRESS_LOG;
 767         }
 768
 769         *log = l;
 770 }
 771
 772 #ifdef CONFIG_SETVBUF
 773 static void *set_file_buffer(FILE *f)
 774 {
 775         size_t size = 1048576;
 776         void *buf;
 777
 778         buf = malloc(size);
 779         setvbuf(f, buf, _IOFBF, size);
 780         return buf;
 781 }
 782
 783 static void clear_file_buffer(void *buf)
 784 {
 785         free(buf);
 786 }
 787 #else
 788 static void *set_file_buffer(FILE *f)
 789 {
 790         return NULL;
 791 }
 792
 793 static void clear_file_buffer(void *buf)
 794 {
 795 }
 796 #endif
 797
 798 void free_log(struct io_log *log)
 799 {
 800         while (!flist_empty(&log->io_logs)) {
 801                 struct io_logs *cur_log;
 802
 803                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
 804                 flist_del_init(&cur_log->list);
 805                 free(cur_log->log);
 806                 sfree(cur_log);
 807         }
 808
 809         if (log->pending) {
 810                 free(log->pending->log);
 811                 free(log->pending);
 812                 log->pending = NULL;
 813         }
 814
 815         free(log->pending);
 816         free(log->filename);
 817         sfree(log);
 818 }
 819
 820 uint64_t hist_sum(int j, int stride, uint64_t *io_u_plat,
 821                 uint64_t *io_u_plat_last)
 822 {
 823         uint64_t sum;
 824         int k;
 825
 826         if (io_u_plat_last) {
 827                 for (k = sum = 0; k < stride; k++)
 828                         sum += io_u_plat[j + k] - io_u_plat_last[j + k];
 829         } else {
 830                 for (k = sum = 0; k < stride; k++)
 831                         sum += io_u_plat[j + k];
 832         }
 833
 834         return sum;
 835 }
 836
 837 static void flush_hist_samples(FILE *f, int hist_coarseness, void *samples,
 838                                uint64_t sample_size)
 839 {
 840         struct io_sample *s;
 841         int log_offset;
 842         uint64_t i, j, nr_samples;
 843         struct io_u_plat_entry *entry, *entry_before;
 844         uint64_t *io_u_plat;
 845         uint64_t *io_u_plat_before;
 846
 847         int stride = 1 << hist_coarseness;
 848
 849         if (!sample_size)
 850                 return;
 851
 852         s = __get_sample(samples, 0, 0);
 853         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 854
 855         nr_samples = sample_size / __log_entry_sz(log_offset);
 856
 857         for (i = 0; i < nr_samples; i++) {
 858                 s = __get_sample(samples, log_offset, i);
 859
 860                 entry = s->data.plat_entry;
 861                 io_u_plat = entry->io_u_plat;
 862
 863                 entry_before = flist_first_entry(&entry->list, struct io_u_plat_entry, list);
 864                 io_u_plat_before = entry_before->io_u_plat;
 865
 866                 fprintf(f, "%lu, %u, %llu, ", (unsigned long) s->time,
 867                                                 io_sample_ddir(s), (unsigned long long) s->bs);
 868                 for (j = 0; j < FIO_IO_U_PLAT_NR - stride; j += stride) {
 869                         fprintf(f, "%llu, ", (unsigned long long)
 870                                 hist_sum(j, stride, io_u_plat, io_u_plat_before));
 871                 }
 872                 fprintf(f, "%llu\n", (unsigned long long)
 873                         hist_sum(FIO_IO_U_PLAT_NR - stride, stride, io_u_plat,
 874                                         io_u_plat_before));
 875
 876                 flist_del(&entry_before->list);
 877                 free(entry_before);
 878         }
 879 }
 880
 881 void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 882 {
 883         struct io_sample *s;
 884         int log_offset;
 885         uint64_t i, nr_samples;
 886
 887         if (!sample_size)
 888                 return;
 889
 890         s = __get_sample(samples, 0, 0);
 891         log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
 892
 893         nr_samples = sample_size / __log_entry_sz(log_offset);
 894
 895         for (i = 0; i < nr_samples; i++) {
 896                 s = __get_sample(samples, log_offset, i);
 897
 898                 if (!log_offset) {
 899                         fprintf(f, "%lu, %" PRId64 ", %u, %llu\n",
 900                                         (unsigned long) s->time,
 901                                         s->data.val,
 902                                         io_sample_ddir(s), (unsigned long long) s->bs);
 903                 } else {
 904                         struct io_sample_offset *so = (void *) s;
 905
 906                         fprintf(f, "%lu, %" PRId64 ", %u, %llu, %llu\n",
 907                                         (unsigned long) s->time,
 908                                         s->data.val,
 909                                         io_sample_ddir(s), (unsigned long long) s->bs,
 910                                         (unsigned long long) so->offset);
 911                 }
 912         }
 913 }
 914
 915 #ifdef CONFIG_ZLIB
 916
 917 struct iolog_flush_data {
 918         struct workqueue_work work;
 919         struct io_log *log;
 920         void *samples;
 921         uint32_t nr_samples;
 922         bool free;
 923 };
 924
 925 #define GZ_CHUNK        131072
 926
 927 static struct iolog_compress *get_new_chunk(unsigned int seq)
 928 {
 929         struct iolog_compress *c;
 930
 931         c = malloc(sizeof(*c));
 932         INIT_FLIST_HEAD(&c->list);
 933         c->buf = malloc(GZ_CHUNK);
 934         c->len = 0;
 935         c->seq = seq;
 936         return c;
 937 }
 938
 939 static void free_chunk(struct iolog_compress *ic)
 940 {
 941         free(ic->buf);
 942         free(ic);
 943 }
 944
 945 static int z_stream_init(z_stream *stream, int gz_hdr)
 946 {
 947         int wbits = 15;
 948
 949         memset(stream, 0, sizeof(*stream));
 950         stream->zalloc = Z_NULL;
 951         stream->zfree = Z_NULL;
 952         stream->opaque = Z_NULL;
 953         stream->next_in = Z_NULL;
 954
 955         /*
 956          * zlib magic - add 32 for auto-detection of gz header or not,
 957          * if we decide to store files in a gzip friendly format.
 958          */
 959         if (gz_hdr)
 960                 wbits += 32;
 961
 962         if (inflateInit2(stream, wbits) != Z_OK)
 963                 return 1;
 964
 965         return 0;
 966 }
 967
 968 struct inflate_chunk_iter {
 969         unsigned int seq;
 970         int err;
 971         void *buf;
 972         size_t buf_size;
 973         size_t buf_used;
 974         size_t chunk_sz;
 975 };
 976
 977 static void finish_chunk(z_stream *stream, FILE *f,
 978                          struct inflate_chunk_iter *iter)
 979 {
 980         int ret;
 981
 982         ret = inflateEnd(stream);
 983         if (ret != Z_OK)
 984                 log_err("fio: failed to end log inflation seq %d (%d)\n",
 985                                 iter->seq, ret);
 986
 987         flush_samples(f, iter->buf, iter->buf_used);
 988         free(iter->buf);
 989         iter->buf = NULL;
 990         iter->buf_size = iter->buf_used = 0;
 991 }
 992
 993 /*
 994  * Iterative chunk inflation. Handles cases where we cross into a new
 995  * sequence, doing flush finish of previous chunk if needed.
 996  */
 997 static size_t inflate_chunk(struct iolog_compress *ic, int gz_hdr, FILE *f,
 998                             z_stream *stream, struct inflate_chunk_iter *iter)
 999 {
1000         size_t ret;
1001
1002         dprint(FD_COMPRESS, "inflate chunk size=%lu, seq=%u\n",
1003                                 (unsigned long) ic->len, ic->seq);
1004
1005         if (ic->seq != iter->seq) {
1006                 if (iter->seq)
1007                         finish_chunk(stream, f, iter);
1008
1009                 z_stream_init(stream, gz_hdr);
1010                 iter->seq = ic->seq;
1011         }
1012
1013         stream->avail_in = ic->len;
1014         stream->next_in = ic->buf;
1015
1016         if (!iter->buf_size) {
1017                 iter->buf_size = iter->chunk_sz;
1018                 iter->buf = malloc(iter->buf_size);
1019         }
1020
1021         while (stream->avail_in) {
1022                 size_t this_out = iter->buf_size - iter->buf_used;
1023                 int err;
1024
1025                 stream->avail_out = this_out;
1026                 stream->next_out = iter->buf + iter->buf_used;
1027
1028                 err = inflate(stream, Z_NO_FLUSH);
1029                 if (err < 0) {
1030                         log_err("fio: failed inflating log: %d\n", err);
1031                         iter->err = err;
1032                         break;
1033                 }
1034
1035                 iter->buf_used += this_out - stream->avail_out;
1036
1037                 if (!stream->avail_out) {
1038                         iter->buf_size += iter->chunk_sz;
1039                         iter->buf = realloc(iter->buf, iter->buf_size);
1040                         continue;
1041                 }
1042
1043                 if (err == Z_STREAM_END)
1044                         break;
1045         }
1046
1047         ret = (void *) stream->next_in - ic->buf;
1048
1049         dprint(FD_COMPRESS, "inflated to size=%lu\n", (unsigned long) iter->buf_size);
1050
1051         return ret;
1052 }
1053
1054 /*
1055  * Inflate stored compressed chunks, or write them directly to the log
1056  * file if so instructed.
1057  */
1058 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1059 {
1060         struct inflate_chunk_iter iter = { .chunk_sz = log->log_gz, };
1061         z_stream stream;
1062
1063         while (!flist_empty(&log->chunk_list)) {
1064                 struct iolog_compress *ic;
1065
1066                 ic = flist_first_entry(&log->chunk_list, struct iolog_compress, list);
1067                 flist_del(&ic->list);
1068
1069                 if (log->log_gz_store) {
1070                         size_t ret;
1071
1072                         dprint(FD_COMPRESS, "log write chunk size=%lu, "
1073                                 "seq=%u\n", (unsigned long) ic->len, ic->seq);
1074
1075                         ret = fwrite(ic->buf, ic->len, 1, f);
1076                         if (ret != 1 || ferror(f)) {
1077                                 iter.err = errno;
1078                                 log_err("fio: error writing compressed log\n");
1079                         }
1080                 } else
1081                         inflate_chunk(ic, log->log_gz_store, f, &stream, &iter);
1082
1083                 free_chunk(ic);
1084         }
1085
1086         if (iter.seq) {
1087                 finish_chunk(&stream, f, &iter);
1088                 free(iter.buf);
1089         }
1090
1091         return iter.err;
1092 }
1093
1094 /*
1095  * Open compressed log file and decompress the stored chunks and
1096  * write them to stdout. The chunks are stored sequentially in the
1097  * file, so we iterate over them and do them one-by-one.
1098  */
1099 int iolog_file_inflate(const char *file)
1100 {
1101         struct inflate_chunk_iter iter = { .chunk_sz = 64 * 1024 * 1024, };
1102         struct iolog_compress ic;
1103         z_stream stream;
1104         struct stat sb;
1105         size_t ret;
1106         size_t total;
1107         void *buf;
1108         FILE *f;
1109
1110         f = fopen(file, "r");
1111         if (!f) {
1112                 perror("fopen");
1113                 return 1;
1114         }
1115
1116         if (stat(file, &sb) < 0) {
1117                 fclose(f);
1118                 perror("stat");
1119                 return 1;
1120         }
1121
1122         ic.buf = buf = malloc(sb.st_size);
1123         ic.len = sb.st_size;
1124         ic.seq = 1;
1125
1126         ret = fread(ic.buf, ic.len, 1, f);
1127         if (ret == 0 && ferror(f)) {
1128                 perror("fread");
1129                 fclose(f);
1130                 free(buf);
1131                 return 1;
1132         } else if (ferror(f) || (!feof(f) && ret != 1)) {
1133                 log_err("fio: short read on reading log\n");
1134                 fclose(f);
1135                 free(buf);
1136                 return 1;
1137         }
1138
1139         fclose(f);
1140
1141         /*
1142          * Each chunk will return Z_STREAM_END. We don't know how many
1143          * chunks are in the file, so we just keep looping and incrementing
1144          * the sequence number until we have consumed the whole compressed
1145          * file.
1146          */
1147         total = ic.len;
1148         do {
1149                 size_t iret;
1150
1151                 iret = inflate_chunk(&ic,  1, stdout, &stream, &iter);
1152                 total -= iret;
1153                 if (!total)
1154                         break;
1155                 if (iter.err)
1156                         break;
1157
1158                 ic.seq++;
1159                 ic.len -= iret;
1160                 ic.buf += iret;
1161         } while (1);
1162
1163         if (iter.seq) {
1164                 finish_chunk(&stream, stdout, &iter);
1165                 free(iter.buf);
1166         }
1167
1168         free(buf);
1169         return iter.err;
1170 }
1171
1172 #else
1173
1174 static int inflate_gz_chunks(struct io_log *log, FILE *f)
1175 {
1176         return 0;
1177 }
1178
1179 int iolog_file_inflate(const char *file)
1180 {
1181         log_err("fio: log inflation not possible without zlib\n");
1182         return 1;
1183 }
1184
1185 #endif
1186
1187 void flush_log(struct io_log *log, bool do_append)
1188 {
1189         void *buf;
1190         FILE *f;
1191
1192         if (!do_append)
1193                 f = fopen(log->filename, "w");
1194         else
1195                 f = fopen(log->filename, "a");
1196         if (!f) {
1197                 perror("fopen log");
1198                 return;
1199         }
1200
1201         buf = set_file_buffer(f);
1202
1203         inflate_gz_chunks(log, f);
1204
1205         while (!flist_empty(&log->io_logs)) {
1206                 struct io_logs *cur_log;
1207
1208                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1209                 flist_del_init(&cur_log->list);
1210
1211                 if (log->td && log == log->td->clat_hist_log)
1212                         flush_hist_samples(f, log->hist_coarseness, cur_log->log,
1213                                            log_sample_sz(log, cur_log));
1214                 else
1215                         flush_samples(f, cur_log->log, log_sample_sz(log, cur_log));
1216
1217                 sfree(cur_log);
1218         }
1219
1220         fclose(f);
1221         clear_file_buffer(buf);
1222 }
1223
1224 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
1225 {
1226         if (td->flags & TD_F_COMPRESS_LOG)
1227                 iolog_flush(log);
1228
1229         if (trylock) {
1230                 if (fio_trylock_file(log->filename))
1231                         return 1;
1232         } else
1233                 fio_lock_file(log->filename);
1234
1235         if (td->client_type == FIO_CLIENT_TYPE_GUI || is_backend)
1236                 fio_send_iolog(td, log, log->filename);
1237         else
1238                 flush_log(log, !td->o.per_job_logs);
1239
1240         fio_unlock_file(log->filename);
1241         free_log(log);
1242         return 0;
1243 }
1244
1245 size_t log_chunk_sizes(struct io_log *log)
1246 {
1247         struct flist_head *entry;
1248         size_t ret;
1249
1250         if (flist_empty(&log->chunk_list))
1251                 return 0;
1252
1253         ret = 0;
1254         pthread_mutex_lock(&log->chunk_lock);
1255         flist_for_each(entry, &log->chunk_list) {
1256                 struct iolog_compress *c;
1257
1258                 c = flist_entry(entry, struct iolog_compress, list);
1259                 ret += c->len;
1260         }
1261         pthread_mutex_unlock(&log->chunk_lock);
1262         return ret;
1263 }
1264
1265 #ifdef CONFIG_ZLIB
1266
1267 static void iolog_put_deferred(struct io_log *log, void *ptr)
1268 {
1269         if (!ptr)
1270                 return;
1271
1272         pthread_mutex_lock(&log->deferred_free_lock);
1273         if (log->deferred < IOLOG_MAX_DEFER) {
1274                 log->deferred_items[log->deferred] = ptr;
1275                 log->deferred++;
1276         } else if (!fio_did_warn(FIO_WARN_IOLOG_DROP))
1277                 log_err("fio: had to drop log entry free\n");
1278         pthread_mutex_unlock(&log->deferred_free_lock);
1279 }
1280
1281 static void iolog_free_deferred(struct io_log *log)
1282 {
1283         int i;
1284
1285         if (!log->deferred)
1286                 return;
1287
1288         pthread_mutex_lock(&log->deferred_free_lock);
1289
1290         for (i = 0; i < log->deferred; i++) {
1291                 free(log->deferred_items[i]);
1292                 log->deferred_items[i] = NULL;
1293         }
1294
1295         log->deferred = 0;
1296         pthread_mutex_unlock(&log->deferred_free_lock);
1297 }
1298
1299 static int gz_work(struct iolog_flush_data *data)
1300 {
1301         struct iolog_compress *c = NULL;
1302         struct flist_head list;
1303         unsigned int seq;
1304         z_stream stream;
1305         size_t total = 0;
1306         int ret;
1307
1308         INIT_FLIST_HEAD(&list);
1309
1310         memset(&stream, 0, sizeof(stream));
1311         stream.zalloc = Z_NULL;
1312         stream.zfree = Z_NULL;
1313         stream.opaque = Z_NULL;
1314
1315         ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
1316         if (ret != Z_OK) {
1317                 log_err("fio: failed to init gz stream\n");
1318                 goto err;
1319         }
1320
1321         seq = ++data->log->chunk_seq;
1322
1323         stream.next_in = (void *) data->samples;
1324         stream.avail_in = data->nr_samples * log_entry_sz(data->log);
1325
1326         dprint(FD_COMPRESS, "deflate input size=%lu, seq=%u, log=%s\n",
1327                                 (unsigned long) stream.avail_in, seq,
1328                                 data->log->filename);
1329         do {
1330                 if (c)
1331                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1332                                 (unsigned long) c->len);
1333                 c = get_new_chunk(seq);
1334                 stream.avail_out = GZ_CHUNK;
1335                 stream.next_out = c->buf;
1336                 ret = deflate(&stream, Z_NO_FLUSH);
1337                 if (ret < 0) {
1338                         log_err("fio: deflate log (%d)\n", ret);
1339                         free_chunk(c);
1340                         goto err;
1341                 }
1342
1343                 c->len = GZ_CHUNK - stream.avail_out;
1344                 flist_add_tail(&c->list, &list);
1345                 total += c->len;
1346         } while (stream.avail_in);
1347
1348         stream.next_out = c->buf + c->len;
1349         stream.avail_out = GZ_CHUNK - c->len;
1350
1351         ret = deflate(&stream, Z_FINISH);
1352         if (ret < 0) {
1353                 /*
1354                  * Z_BUF_ERROR is special, it just means we need more
1355                  * output space. We'll handle that below. Treat any other
1356                  * error as fatal.
1357                  */
1358                 if (ret != Z_BUF_ERROR) {
1359                         log_err("fio: deflate log (%d)\n", ret);
1360                         flist_del(&c->list);
1361                         free_chunk(c);
1362                         goto err;
1363                 }
1364         }
1365
1366         total -= c->len;
1367         c->len = GZ_CHUNK - stream.avail_out;
1368         total += c->len;
1369         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq, (unsigned long) c->len);
1370
1371         if (ret != Z_STREAM_END) {
1372                 do {
1373                         c = get_new_chunk(seq);
1374                         stream.avail_out = GZ_CHUNK;
1375                         stream.next_out = c->buf;
1376                         ret = deflate(&stream, Z_FINISH);
1377                         c->len = GZ_CHUNK - stream.avail_out;
1378                         total += c->len;
1379                         flist_add_tail(&c->list, &list);
1380                         dprint(FD_COMPRESS, "seq=%d, chunk=%lu\n", seq,
1381                                 (unsigned long) c->len);
1382                 } while (ret != Z_STREAM_END);
1383         }
1384
1385         dprint(FD_COMPRESS, "deflated to size=%lu\n", (unsigned long) total);
1386
1387         ret = deflateEnd(&stream);
1388         if (ret != Z_OK)
1389                 log_err("fio: deflateEnd %d\n", ret);
1390
1391         iolog_put_deferred(data->log, data->samples);
1392
1393         if (!flist_empty(&list)) {
1394                 pthread_mutex_lock(&data->log->chunk_lock);
1395                 flist_splice_tail(&list, &data->log->chunk_list);
1396                 pthread_mutex_unlock(&data->log->chunk_lock);
1397         }
1398
1399         ret = 0;
1400 done:
1401         if (data->free)
1402                 sfree(data);
1403         return ret;
1404 err:
1405         while (!flist_empty(&list)) {
1406                 c = flist_first_entry(list.next, struct iolog_compress, list);
1407                 flist_del(&c->list);
1408                 free_chunk(c);
1409         }
1410         ret = 1;
1411         goto done;
1412 }
1413
1414 /*
1415  * Invoked from our compress helper thread, when logging would have exceeded
1416  * the specified memory limitation. Compresses the previously stored
1417  * entries.
1418  */
1419 static int gz_work_async(struct submit_worker *sw, struct workqueue_work *work)
1420 {
1421         return gz_work(container_of(work, struct iolog_flush_data, work));
1422 }
1423
1424 static int gz_init_worker(struct submit_worker *sw)
1425 {
1426         struct thread_data *td = sw->wq->td;
1427
1428         if (!fio_option_is_set(&td->o, log_gz_cpumask))
1429                 return 0;
1430
1431         if (fio_setaffinity(gettid(), td->o.log_gz_cpumask) == -1) {
1432                 log_err("gz: failed to set CPU affinity\n");
1433                 return 1;
1434         }
1435
1436         return 0;
1437 }
1438
1439 static struct workqueue_ops log_compress_wq_ops = {
1440         .fn             = gz_work_async,
1441         .init_worker_fn = gz_init_worker,
1442         .nice           = 1,
1443 };
1444
1445 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1446 {
1447         if (!(td->flags & TD_F_COMPRESS_LOG))
1448                 return 0;
1449
1450         workqueue_init(td, &td->log_compress_wq, &log_compress_wq_ops, 1, sk_out);
1451         return 0;
1452 }
1453
1454 void iolog_compress_exit(struct thread_data *td)
1455 {
1456         if (!(td->flags & TD_F_COMPRESS_LOG))
1457                 return;
1458
1459         workqueue_exit(&td->log_compress_wq);
1460 }
1461
1462 /*
1463  * Queue work item to compress the existing log entries. We reset the
1464  * current log to a small size, and reference the existing log in the
1465  * data that we queue for compression. Once compression has been done,
1466  * this old log is freed. If called with finish == true, will not return
1467  * until the log compression has completed, and will flush all previous
1468  * logs too
1469  */
1470 static int iolog_flush(struct io_log *log)
1471 {
1472         struct iolog_flush_data *data;
1473
1474         data = malloc(sizeof(*data));
1475         if (!data)
1476                 return 1;
1477
1478         data->log = log;
1479         data->free = false;
1480
1481         while (!flist_empty(&log->io_logs)) {
1482                 struct io_logs *cur_log;
1483
1484                 cur_log = flist_first_entry(&log->io_logs, struct io_logs, list);
1485                 flist_del_init(&cur_log->list);
1486
1487                 data->samples = cur_log->log;
1488                 data->nr_samples = cur_log->nr_samples;
1489
1490                 sfree(cur_log);
1491
1492                 gz_work(data);
1493         }
1494
1495         free(data);
1496         return 0;
1497 }
1498
1499 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1500 {
1501         struct iolog_flush_data *data;
1502
1503         data = smalloc(sizeof(*data));
1504         if (!data)
1505                 return 1;
1506
1507         data->log = log;
1508
1509         data->samples = cur_log->log;
1510         data->nr_samples = cur_log->nr_samples;
1511         data->free = true;
1512
1513         cur_log->nr_samples = cur_log->max_samples = 0;
1514         cur_log->log = NULL;
1515
1516         workqueue_enqueue(&log->td->log_compress_wq, &data->work);
1517
1518         iolog_free_deferred(log);
1519
1520         return 0;
1521 }
1522 #else
1523
1524 static int iolog_flush(struct io_log *log)
1525 {
1526         return 1;
1527 }
1528
1529 int iolog_cur_flush(struct io_log *log, struct io_logs *cur_log)
1530 {
1531         return 1;
1532 }
1533
1534 int iolog_compress_init(struct thread_data *td, struct sk_out *sk_out)
1535 {
1536         return 0;
1537 }
1538
1539 void iolog_compress_exit(struct thread_data *td)
1540 {
1541 }
1542
1543 #endif
1544
1545 struct io_logs *iolog_cur_log(struct io_log *log)
1546 {
1547         if (flist_empty(&log->io_logs))
1548                 return NULL;
1549
1550         return flist_last_entry(&log->io_logs, struct io_logs, list);
1551 }
1552
1553 uint64_t iolog_nr_samples(struct io_log *iolog)
1554 {
1555         struct flist_head *entry;
1556         uint64_t ret = 0;
1557
1558         flist_for_each(entry, &iolog->io_logs) {
1559                 struct io_logs *cur_log;
1560
1561                 cur_log = flist_entry(entry, struct io_logs, list);
1562                 ret += cur_log->nr_samples;
1563         }
1564
1565         return ret;
1566 }
1567
1568 static int __write_log(struct thread_data *td, struct io_log *log, int try)
1569 {
1570         if (log)
1571                 return finish_log(td, log, try);
1572
1573         return 0;
1574 }
1575
1576 static int write_iops_log(struct thread_data *td, int try, bool unit_log)
1577 {
1578         int ret;
1579
1580         if (per_unit_log(td->iops_log) != unit_log)
1581                 return 0;
1582
1583         ret = __write_log(td, td->iops_log, try);
1584         if (!ret)
1585                 td->iops_log = NULL;
1586
1587         return ret;
1588 }
1589
1590 static int write_slat_log(struct thread_data *td, int try, bool unit_log)
1591 {
1592         int ret;
1593
1594         if (!unit_log)
1595                 return 0;
1596
1597         ret = __write_log(td, td->slat_log, try);
1598         if (!ret)
1599                 td->slat_log = NULL;
1600
1601         return ret;
1602 }
1603
1604 static int write_clat_log(struct thread_data *td, int try, bool unit_log)
1605 {
1606         int ret;
1607
1608         if (!unit_log)
1609                 return 0;
1610
1611         ret = __write_log(td, td->clat_log, try);
1612         if (!ret)
1613                 td->clat_log = NULL;
1614
1615         return ret;
1616 }
1617
1618 static int write_clat_hist_log(struct thread_data *td, int try, bool unit_log)
1619 {
1620         int ret;
1621
1622         if (!unit_log)
1623                 return 0;
1624
1625         ret = __write_log(td, td->clat_hist_log, try);
1626         if (!ret)
1627                 td->clat_hist_log = NULL;
1628
1629         return ret;
1630 }
1631
1632 static int write_lat_log(struct thread_data *td, int try, bool unit_log)
1633 {
1634         int ret;
1635
1636         if (!unit_log)
1637                 return 0;
1638
1639         ret = __write_log(td, td->lat_log, try);
1640         if (!ret)
1641                 td->lat_log = NULL;
1642
1643         return ret;
1644 }
1645
1646 static int write_bandw_log(struct thread_data *td, int try, bool unit_log)
1647 {
1648         int ret;
1649
1650         if (per_unit_log(td->bw_log) != unit_log)
1651                 return 0;
1652
1653         ret = __write_log(td, td->bw_log, try);
1654         if (!ret)
1655                 td->bw_log = NULL;
1656
1657         return ret;
1658 }
1659
1660 enum {
1661         BW_LOG_MASK     = 1,
1662         LAT_LOG_MASK    = 2,
1663         SLAT_LOG_MASK   = 4,
1664         CLAT_LOG_MASK   = 8,
1665         IOPS_LOG_MASK   = 16,
1666         CLAT_HIST_LOG_MASK = 32,
1667
1668         ALL_LOG_NR      = 6,
1669 };
1670
1671 struct log_type {
1672         unsigned int mask;
1673         int (*fn)(struct thread_data *, int, bool);
1674 };
1675
1676 static struct log_type log_types[] = {
1677         {
1678                 .mask   = BW_LOG_MASK,
1679                 .fn     = write_bandw_log,
1680         },
1681         {
1682                 .mask   = LAT_LOG_MASK,
1683                 .fn     = write_lat_log,
1684         },
1685         {
1686                 .mask   = SLAT_LOG_MASK,
1687                 .fn     = write_slat_log,
1688         },
1689         {
1690                 .mask   = CLAT_LOG_MASK,
1691                 .fn     = write_clat_log,
1692         },
1693         {
1694                 .mask   = IOPS_LOG_MASK,
1695                 .fn     = write_iops_log,
1696         },
1697         {
1698                 .mask   = CLAT_HIST_LOG_MASK,
1699                 .fn     = write_clat_hist_log,
1700         }
1701 };
1702
1703 void td_writeout_logs(struct thread_data *td, bool unit_logs)
1704 {
1705         unsigned int log_mask = 0;
1706         unsigned int log_left = ALL_LOG_NR;
1707         int old_state, i;
1708
1709         old_state = td_bump_runstate(td, TD_FINISHING);
1710
1711         finalize_logs(td, unit_logs);
1712
1713         while (log_left) {
1714                 int prev_log_left = log_left;
1715
1716                 for (i = 0; i < ALL_LOG_NR && log_left; i++) {
1717                         struct log_type *lt = &log_types[i];
1718                         int ret;
1719
1720                         if (!(log_mask & lt->mask)) {
1721                                 ret = lt->fn(td, log_left != 1, unit_logs);
1722                                 if (!ret) {
1723                                         log_left--;
1724                                         log_mask |= lt->mask;
1725                                 }
1726                         }
1727                 }
1728
1729                 if (prev_log_left == log_left)
1730                         usleep(5000);
1731         }
1732
1733         td_restore_runstate(td, old_state);
1734 }
1735
1736 void fio_writeout_logs(bool unit_logs)
1737 {
1738         struct thread_data *td;
1739         int i;
1740
1741         for_each_td(td, i)
1742                 td_writeout_logs(td, unit_logs);
1743 }