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