diskutil.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <sys/time.h>
   4 #include <sys/types.h>
   5 #include <sys/stat.h>
   6 #include <dirent.h>
   7 #include <libgen.h>
   8 #include <math.h>
   9 #include <assert.h>
  10
  11 #include "fio.h"
  12 #include "smalloc.h"
  13 #include "diskutil.h"
  14 #include "helper_thread.h"
  15
  16 static int last_majdev, last_mindev;
  17 static struct disk_util *last_du;
  18
  19 static struct fio_mutex *disk_util_mutex;
  20
  21 FLIST_HEAD(disk_list);
  22
  23 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
  24                 int majdev, int mindev, char *path);
  25
  26 static void disk_util_free(struct disk_util *du)
  27 {
  28         if (du == last_du)
  29                 last_du = NULL;
  30
  31         while (!flist_empty(&du->slaves)) {
  32                 struct disk_util *slave;
  33
  34                 slave = flist_first_entry(&du->slaves, struct disk_util, slavelist);
  35                 flist_del(&slave->slavelist);
  36                 slave->users--;
  37         }
  38
  39         fio_mutex_remove(du->lock);
  40         free(du->sysfs_root);
  41         sfree(du);
  42 }
  43
  44 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
  45 {
  46         unsigned in_flight;
  47         unsigned long long sectors[2];
  48         char line[256];
  49         FILE *f;
  50         char *p;
  51         int ret;
  52
  53         dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
  54
  55         f = fopen(du->path, "r");
  56         if (!f)
  57                 return 1;
  58
  59         p = fgets(line, sizeof(line), f);
  60         if (!p) {
  61                 fclose(f);
  62                 return 1;
  63         }
  64
  65         dprint(FD_DISKUTIL, "%s: %s", du->path, p);
  66
  67         ret = sscanf(p, "%llu %llu %llu %llu %llu %llu %llu %llu %u %llu %llu\n",
  68                                 (unsigned long long *) &dus->s.ios[0],
  69                                 (unsigned long long *) &dus->s.merges[0],
  70                                 &sectors[0],
  71                                 (unsigned long long *) &dus->s.ticks[0],
  72                                 (unsigned long long *) &dus->s.ios[1],
  73                                 (unsigned long long *) &dus->s.merges[1],
  74                                 &sectors[1],
  75                                 (unsigned long long *) &dus->s.ticks[1],
  76                                 &in_flight,
  77                                 (unsigned long long *) &dus->s.io_ticks,
  78                                 (unsigned long long *) &dus->s.time_in_queue);
  79         fclose(f);
  80         dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
  81         dus->s.sectors[0] = sectors[0];
  82         dus->s.sectors[1] = sectors[1];
  83         return ret != 11;
  84 }
  85
  86 static void update_io_tick_disk(struct disk_util *du)
  87 {
  88         struct disk_util_stat __dus, *dus, *ldus;
  89         struct timeval t;
  90
  91         if (!du->users)
  92                 return;
  93         if (get_io_ticks(du, &__dus))
  94                 return;
  95
  96         dus = &du->dus;
  97         ldus = &du->last_dus;
  98
  99         dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
 100         dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
 101         dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
 102         dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
 103         dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
 104         dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
 105         dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
 106         dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
 107         dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
 108         dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
 109
 110         fio_gettime(&t, NULL);
 111         dus->s.msec += mtime_since(&du->time, &t);
 112         memcpy(&du->time, &t, sizeof(t));
 113         memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
 114 }
 115
 116 int update_io_ticks(void)
 117 {
 118         struct flist_head *entry;
 119         struct disk_util *du;
 120         int ret = 0;
 121
 122         dprint(FD_DISKUTIL, "update io ticks\n");
 123
 124         fio_mutex_down(disk_util_mutex);
 125
 126         if (!helper_should_exit()) {
 127                 flist_for_each(entry, &disk_list) {
 128                         du = flist_entry(entry, struct disk_util, list);
 129                         update_io_tick_disk(du);
 130                 }
 131         } else
 132                 ret = 1;
 133
 134         fio_mutex_up(disk_util_mutex);
 135         return ret;
 136 }
 137
 138 static struct disk_util *disk_util_exists(int major, int minor)
 139 {
 140         struct flist_head *entry;
 141         struct disk_util *du;
 142
 143         fio_mutex_down(disk_util_mutex);
 144
 145         flist_for_each(entry, &disk_list) {
 146                 du = flist_entry(entry, struct disk_util, list);
 147
 148                 if (major == du->major && minor == du->minor) {
 149                         fio_mutex_up(disk_util_mutex);
 150                         return du;
 151                 }
 152         }
 153
 154         fio_mutex_up(disk_util_mutex);
 155         return NULL;
 156 }
 157
 158 static int get_device_numbers(char *file_name, int *maj, int *min)
 159 {
 160         struct stat st;
 161         int majdev, mindev;
 162         char tempname[PATH_MAX], *p;
 163
 164         if (!lstat(file_name, &st)) {
 165                 if (S_ISBLK(st.st_mode)) {
 166                         majdev = major(st.st_rdev);
 167                         mindev = minor(st.st_rdev);
 168                 } else if (S_ISCHR(st.st_mode)) {
 169                         majdev = major(st.st_rdev);
 170                         mindev = minor(st.st_rdev);
 171                         if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
 172                                 return -1;
 173                 } else if (S_ISFIFO(st.st_mode))
 174                         return -1;
 175                 else {
 176                         majdev = major(st.st_dev);
 177                         mindev = minor(st.st_dev);
 178                 }
 179         } else {
 180                 /*
 181                  * must be a file, open "." in that path
 182                  */
 183                 tempname[PATH_MAX - 1] = '\0';
 184                 strncpy(tempname, file_name, PATH_MAX - 1);
 185                 p = dirname(tempname);
 186                 if (stat(p, &st)) {
 187                         perror("disk util stat");
 188                         return -1;
 189                 }
 190
 191                 majdev = major(st.st_dev);
 192                 mindev = minor(st.st_dev);
 193         }
 194
 195         *min = mindev;
 196         *maj = majdev;
 197
 198         return 0;
 199 }
 200
 201 static int read_block_dev_entry(char *path, int *maj, int *min)
 202 {
 203         char line[256], *p;
 204         FILE *f;
 205
 206         f = fopen(path, "r");
 207         if (!f) {
 208                 perror("open path");
 209                 return 1;
 210         }
 211
 212         p = fgets(line, sizeof(line), f);
 213         fclose(f);
 214
 215         if (!p)
 216                 return 1;
 217
 218         if (sscanf(p, "%u:%u", maj, min) != 2)
 219                 return 1;
 220
 221         return 0;
 222 }
 223
 224 static void find_add_disk_slaves(struct thread_data *td, char *path,
 225                                  struct disk_util *masterdu)
 226 {
 227         DIR *dirhandle = NULL;
 228         struct dirent *dirent = NULL;
 229         char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
 230         struct disk_util *slavedu = NULL;
 231         int majdev, mindev;
 232         ssize_t linklen;
 233
 234         sprintf(slavesdir, "%s/%s", path, "slaves");
 235         dirhandle = opendir(slavesdir);
 236         if (!dirhandle)
 237                 return;
 238
 239         while ((dirent = readdir(dirhandle)) != NULL) {
 240                 if (!strcmp(dirent->d_name, ".") ||
 241                     !strcmp(dirent->d_name, ".."))
 242                         continue;
 243
 244                 sprintf(temppath, "%s/%s", slavesdir, dirent->d_name);
 245                 /* Can we always assume that the slaves device entries
 246                  * are links to the real directories for the slave
 247                  * devices?
 248                  */
 249                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 250                 if (linklen  < 0) {
 251                         perror("readlink() for slave device.");
 252                         closedir(dirhandle);
 253                         return;
 254                 }
 255                 slavepath[linklen] = '\0';
 256
 257                 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
 258                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 259                         perror("Error getting slave device numbers.");
 260                         closedir(dirhandle);
 261                         return;
 262                 }
 263
 264                 /*
 265                  * See if this maj,min already exists
 266                  */
 267                 slavedu = disk_util_exists(majdev, mindev);
 268                 if (slavedu)
 269                         continue;
 270
 271                 sprintf(temppath, "%s/%s", slavesdir, slavepath);
 272                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 273                 slavedu = disk_util_exists(majdev, mindev);
 274
 275                 /* Should probably use an assert here. slavedu should
 276                  * always be present at this point. */
 277                 if (slavedu) {
 278                         slavedu->users++;
 279                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 280                 }
 281         }
 282
 283         closedir(dirhandle);
 284 }
 285
 286 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 287                                        int mindev, char *path)
 288 {
 289         struct disk_util *du, *__du;
 290         struct flist_head *entry;
 291         int l;
 292
 293         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 294
 295         du = smalloc(sizeof(*du));
 296         if (!du)
 297                 return NULL;
 298
 299         memset(du, 0, sizeof(*du));
 300         INIT_FLIST_HEAD(&du->list);
 301         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 302         if (l < 0 || l >= sizeof(du->path)) {
 303                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 304                         path, sizeof(du->path) - 1);
 305                 sfree(du);
 306                 return NULL;
 307         }
 308         strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
 309         du->sysfs_root = strdup(path);
 310         du->major = majdev;
 311         du->minor = mindev;
 312         INIT_FLIST_HEAD(&du->slavelist);
 313         INIT_FLIST_HEAD(&du->slaves);
 314         du->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 315         du->users = 0;
 316
 317         fio_mutex_down(disk_util_mutex);
 318
 319         flist_for_each(entry, &disk_list) {
 320                 __du = flist_entry(entry, struct disk_util, list);
 321
 322                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 323
 324                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 325                         disk_util_free(du);
 326                         fio_mutex_up(disk_util_mutex);
 327                         return __du;
 328                 }
 329         }
 330
 331         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 332
 333         fio_gettime(&du->time, NULL);
 334         get_io_ticks(du, &du->last_dus);
 335
 336         flist_add_tail(&du->list, &disk_list);
 337         fio_mutex_up(disk_util_mutex);
 338
 339         find_add_disk_slaves(td, path, du);
 340         return du;
 341 }
 342
 343 static int check_dev_match(int majdev, int mindev, char *path)
 344 {
 345         int major, minor;
 346
 347         if (read_block_dev_entry(path, &major, &minor))
 348                 return 1;
 349
 350         if (majdev == major && mindev == minor)
 351                 return 0;
 352
 353         return 1;
 354 }
 355
 356 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 357 {
 358         struct dirent *dir;
 359         struct stat st;
 360         int found = 0;
 361         DIR *D;
 362
 363         D = opendir(path);
 364         if (!D)
 365                 return 0;
 366
 367         while ((dir = readdir(D)) != NULL) {
 368                 char full_path[256];
 369
 370                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 371                         continue;
 372
 373                 sprintf(full_path, "%s/%s", path, dir->d_name);
 374
 375                 if (!strcmp(dir->d_name, "dev")) {
 376                         if (!check_dev_match(majdev, mindev, full_path)) {
 377                                 found = 1;
 378                                 break;
 379                         }
 380                 }
 381
 382                 if (link_ok) {
 383                         if (stat(full_path, &st) == -1) {
 384                                 perror("stat");
 385                                 break;
 386                         }
 387                 } else {
 388                         if (lstat(full_path, &st) == -1) {
 389                                 perror("stat");
 390                                 break;
 391                         }
 392                 }
 393
 394                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 395                         continue;
 396
 397                 found = find_block_dir(majdev, mindev, full_path, 0);
 398                 if (found) {
 399                         strcpy(path, full_path);
 400                         break;
 401                 }
 402         }
 403
 404         closedir(D);
 405         return found;
 406 }
 407
 408 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 409                                                    int majdev, int mindev,
 410                                                    char *path)
 411 {
 412         struct stat st;
 413         char tmp[PATH_MAX];
 414         char *p;
 415
 416         /*
 417          * If there's a ../queue/ directory there, we are inside a partition.
 418          * Check if that is the case and jump back. For loop/md/dm etc we
 419          * are already in the right spot.
 420          */
 421         sprintf(tmp, "%s/../queue", path);
 422         if (!stat(tmp, &st)) {
 423                 p = dirname(path);
 424                 sprintf(tmp, "%s/queue", p);
 425                 if (stat(tmp, &st)) {
 426                         log_err("unknown sysfs layout\n");
 427                         return NULL;
 428                 }
 429                 tmp[PATH_MAX - 1] = '\0';
 430                 strncpy(tmp, p, PATH_MAX - 1);
 431                 sprintf(path, "%s", tmp);
 432         }
 433
 434         return disk_util_add(td, majdev, mindev, path);
 435 }
 436
 437 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 438                                                  char *filename)
 439 {
 440
 441         char foo[PATH_MAX];
 442         struct disk_util *du;
 443         int mindev, majdev;
 444
 445         if (get_device_numbers(filename, &majdev, &mindev))
 446                 return NULL;
 447
 448         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 449                         mindev);
 450
 451         du = disk_util_exists(majdev, mindev);
 452         if (du)
 453                 return du;
 454
 455         /*
 456          * for an fs without a device, we will repeatedly stat through
 457          * sysfs which can take oodles of time for thousands of files. so
 458          * cache the last lookup and compare with that before going through
 459          * everything again.
 460          */
 461         if (mindev == last_mindev && majdev == last_majdev)
 462                 return last_du;
 463
 464         last_mindev = mindev;
 465         last_majdev = majdev;
 466
 467         sprintf(foo, "/sys/block");
 468         if (!find_block_dir(majdev, mindev, foo, 1))
 469                 return NULL;
 470
 471         return __init_per_file_disk_util(td, majdev, mindev, foo);
 472 }
 473
 474 static struct disk_util *__init_disk_util(struct thread_data *td,
 475                                           struct fio_file *f)
 476 {
 477         return init_per_file_disk_util(td, f->file_name);
 478 }
 479
 480 void init_disk_util(struct thread_data *td)
 481 {
 482         struct fio_file *f;
 483         unsigned int i;
 484
 485         if (!td->o.do_disk_util ||
 486             td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
 487                 return;
 488
 489         for_each_file(td, f, i)
 490                 f->du = __init_disk_util(td, f);
 491 }
 492
 493 static void show_agg_stats(struct disk_util_agg *agg, int terse,
 494                            struct buf_output *out)
 495 {
 496         if (!agg->slavecount)
 497                 return;
 498
 499         if (!terse) {
 500                 log_buf(out, ", aggrios=%llu/%llu, aggrmerge=%llu/%llu, "
 501                          "aggrticks=%llu/%llu, aggrin_queue=%llu, "
 502                          "aggrutil=%3.2f%%",
 503                         (unsigned long long) agg->ios[0] / agg->slavecount,
 504                         (unsigned long long) agg->ios[1] / agg->slavecount,
 505                         (unsigned long long) agg->merges[0] / agg->slavecount,
 506                         (unsigned long long) agg->merges[1] / agg->slavecount,
 507                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 508                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 509                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 510                         agg->max_util.u.f);
 511         } else {
 512                 log_buf(out, ";slaves;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 513                         (unsigned long long) agg->ios[0] / agg->slavecount,
 514                         (unsigned long long) agg->ios[1] / agg->slavecount,
 515                         (unsigned long long) agg->merges[0] / agg->slavecount,
 516                         (unsigned long long) agg->merges[1] / agg->slavecount,
 517                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 518                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 519                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 520                         agg->max_util.u.f);
 521         }
 522 }
 523
 524 static void aggregate_slaves_stats(struct disk_util *masterdu)
 525 {
 526         struct disk_util_agg *agg = &masterdu->agg;
 527         struct disk_util_stat *dus;
 528         struct flist_head *entry;
 529         struct disk_util *slavedu;
 530         double util;
 531
 532         flist_for_each(entry, &masterdu->slaves) {
 533                 slavedu = flist_entry(entry, struct disk_util, slavelist);
 534                 dus = &slavedu->dus;
 535                 agg->ios[0] += dus->s.ios[0];
 536                 agg->ios[1] += dus->s.ios[1];
 537                 agg->merges[0] += dus->s.merges[0];
 538                 agg->merges[1] += dus->s.merges[1];
 539                 agg->sectors[0] += dus->s.sectors[0];
 540                 agg->sectors[1] += dus->s.sectors[1];
 541                 agg->ticks[0] += dus->s.ticks[0];
 542                 agg->ticks[1] += dus->s.ticks[1];
 543                 agg->time_in_queue += dus->s.time_in_queue;
 544                 agg->slavecount++;
 545
 546                 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
 547                 /* System utilization is the utilization of the
 548                  * component with the highest utilization.
 549                  */
 550                 if (util > agg->max_util.u.f)
 551                         agg->max_util.u.f = util;
 552
 553         }
 554
 555         if (agg->max_util.u.f > 100.0)
 556                 agg->max_util.u.f = 100.0;
 557 }
 558
 559 void disk_util_prune_entries(void)
 560 {
 561         fio_mutex_down(disk_util_mutex);
 562
 563         while (!flist_empty(&disk_list)) {
 564                 struct disk_util *du;
 565
 566                 du = flist_first_entry(&disk_list, struct disk_util, list);
 567                 flist_del(&du->list);
 568                 disk_util_free(du);
 569         }
 570
 571         last_majdev = last_mindev = -1;
 572         fio_mutex_up(disk_util_mutex);
 573         fio_mutex_remove(disk_util_mutex);
 574 }
 575
 576 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 577                      int terse, struct buf_output *out)
 578 {
 579         double util = 0;
 580
 581         if (dus->s.msec)
 582                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 583         if (util > 100.0)
 584                 util = 100.0;
 585
 586         if (!terse) {
 587                 if (agg->slavecount)
 588                         log_buf(out, "  ");
 589
 590                 log_buf(out, "  %s: ios=%llu/%llu, merge=%llu/%llu, "
 591                          "ticks=%llu/%llu, in_queue=%llu, util=%3.2f%%",
 592                                 dus->name,
 593                                 (unsigned long long) dus->s.ios[0],
 594                                 (unsigned long long) dus->s.ios[1],
 595                                 (unsigned long long) dus->s.merges[0],
 596                                 (unsigned long long) dus->s.merges[1],
 597                                 (unsigned long long) dus->s.ticks[0],
 598                                 (unsigned long long) dus->s.ticks[1],
 599                                 (unsigned long long) dus->s.time_in_queue,
 600                                 util);
 601         } else {
 602                 log_buf(out, ";%s;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 603                                 dus->name,
 604                                 (unsigned long long) dus->s.ios[0],
 605                                 (unsigned long long) dus->s.ios[1],
 606                                 (unsigned long long) dus->s.merges[0],
 607                                 (unsigned long long) dus->s.merges[1],
 608                                 (unsigned long long) dus->s.ticks[0],
 609                                 (unsigned long long) dus->s.ticks[1],
 610                                 (unsigned long long) dus->s.time_in_queue,
 611                                 util);
 612         }
 613
 614         /*
 615          * If the device has slaves, aggregate the stats for
 616          * those slave devices also.
 617          */
 618         show_agg_stats(agg, terse, out);
 619
 620         if (!terse)
 621                 log_buf(out, "\n");
 622 }
 623
 624 void json_array_add_disk_util(struct disk_util_stat *dus,
 625                 struct disk_util_agg *agg, struct json_array *array)
 626 {
 627         struct json_object *obj;
 628         double util = 0;
 629
 630         if (dus->s.msec)
 631                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 632         if (util > 100.0)
 633                 util = 100.0;
 634
 635         obj = json_create_object();
 636         json_array_add_value_object(array, obj);
 637
 638         json_object_add_value_string(obj, "name", dus->name);
 639         json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
 640         json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
 641         json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
 642         json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
 643         json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
 644         json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
 645         json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
 646         json_object_add_value_float(obj, "util", util);
 647
 648         /*
 649          * If the device has slaves, aggregate the stats for
 650          * those slave devices also.
 651          */
 652         if (!agg->slavecount)
 653                 return;
 654         json_object_add_value_int(obj, "aggr_read_ios",
 655                                 agg->ios[0] / agg->slavecount);
 656         json_object_add_value_int(obj, "aggr_write_ios",
 657                                 agg->ios[1] / agg->slavecount);
 658         json_object_add_value_int(obj, "aggr_read_merges",
 659                                 agg->merges[0] / agg->slavecount);
 660         json_object_add_value_int(obj, "aggr_write_merge",
 661                                 agg->merges[1] / agg->slavecount);
 662         json_object_add_value_int(obj, "aggr_read_ticks",
 663                                 agg->ticks[0] / agg->slavecount);
 664         json_object_add_value_int(obj, "aggr_write_ticks",
 665                                 agg->ticks[1] / agg->slavecount);
 666         json_object_add_value_int(obj, "aggr_in_queue",
 667                                 agg->time_in_queue / agg->slavecount);
 668         json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
 669 }
 670
 671 static void json_object_add_disk_utils(struct json_object *obj,
 672                                        struct flist_head *head)
 673 {
 674         struct json_array *array = json_create_array();
 675         struct flist_head *entry;
 676         struct disk_util *du;
 677
 678         json_object_add_value_array(obj, "disk_util", array);
 679
 680         flist_for_each(entry, head) {
 681                 du = flist_entry(entry, struct disk_util, list);
 682
 683                 aggregate_slaves_stats(du);
 684                 json_array_add_disk_util(&du->dus, &du->agg, array);
 685         }
 686 }
 687
 688 void show_disk_util(int terse, struct json_object *parent,
 689                     struct buf_output *out)
 690 {
 691         struct flist_head *entry;
 692         struct disk_util *du;
 693         bool do_json;
 694
 695         if (!disk_util_mutex)
 696                 return;
 697
 698         fio_mutex_down(disk_util_mutex);
 699
 700         if (flist_empty(&disk_list)) {
 701                 fio_mutex_up(disk_util_mutex);
 702                 return;
 703         }
 704
 705         if ((output_format & FIO_OUTPUT_JSON) && parent)
 706                 do_json = true;
 707         else
 708                 do_json = false;
 709
 710         if (!terse && !do_json)
 711                 log_buf(out, "\nDisk stats (read/write):\n");
 712
 713         if (do_json)
 714                 json_object_add_disk_utils(parent, &disk_list);
 715         else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
 716                 flist_for_each(entry, &disk_list) {
 717                         du = flist_entry(entry, struct disk_util, list);
 718
 719                         aggregate_slaves_stats(du);
 720                         print_disk_util(&du->dus, &du->agg, terse, out);
 721                 }
 722         }
 723
 724         fio_mutex_up(disk_util_mutex);
 725 }
 726
 727 void setup_disk_util(void)
 728 {
 729         disk_util_mutex = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 730 }