diskutil.c

   1 #include <stdio.h>
   2 #include <string.h>
   3 #include <sys/types.h>
   4 #include <sys/stat.h>
   5 #include <sys/sysmacros.h>
   6 #include <dirent.h>
   7 #include <libgen.h>
   8 #ifdef CONFIG_VALGRIND_DEV
   9 #include <valgrind/drd.h>
  10 #else
  11 #define DRD_IGNORE_VAR(x) do { } while (0)
  12 #endif
  13
  14 #include "fio.h"
  15 #include "smalloc.h"
  16 #include "diskutil.h"
  17 #include "helper_thread.h"
  18
  19 static int last_majdev, last_mindev;
  20 static struct disk_util *last_du;
  21
  22 static struct fio_sem *disk_util_sem;
  23
  24 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
  25                 int majdev, int mindev, char *path);
  26
  27 static void disk_util_free(struct disk_util *du)
  28 {
  29         if (du == last_du)
  30                 last_du = NULL;
  31
  32         while (!flist_empty(&du->slaves)) {
  33                 struct disk_util *slave;
  34
  35                 slave = flist_first_entry(&du->slaves, struct disk_util, slavelist);
  36                 flist_del(&slave->slavelist);
  37                 slave->users--;
  38         }
  39
  40         fio_sem_remove(du->lock);
  41         free(du->sysfs_root);
  42         sfree(du);
  43 }
  44
  45 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
  46 {
  47         unsigned in_flight;
  48         unsigned long long sectors[2];
  49         char line[256];
  50         FILE *f;
  51         char *p;
  52         int ret;
  53
  54         dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
  55
  56         f = fopen(du->path, "r");
  57         if (!f)
  58                 return 1;
  59
  60         p = fgets(line, sizeof(line), f);
  61         if (!p) {
  62                 fclose(f);
  63                 return 1;
  64         }
  65
  66         dprint(FD_DISKUTIL, "%s: %s", du->path, p);
  67
  68         ret = sscanf(p, "%llu %llu %llu %llu %llu %llu %llu %llu %u %llu %llu\n",
  69                                 (unsigned long long *) &dus->s.ios[0],
  70                                 (unsigned long long *) &dus->s.merges[0],
  71                                 &sectors[0],
  72                                 (unsigned long long *) &dus->s.ticks[0],
  73                                 (unsigned long long *) &dus->s.ios[1],
  74                                 (unsigned long long *) &dus->s.merges[1],
  75                                 &sectors[1],
  76                                 (unsigned long long *) &dus->s.ticks[1],
  77                                 &in_flight,
  78                                 (unsigned long long *) &dus->s.io_ticks,
  79                                 (unsigned long long *) &dus->s.time_in_queue);
  80         fclose(f);
  81         dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
  82         dus->s.sectors[0] = sectors[0];
  83         dus->s.sectors[1] = sectors[1];
  84         return ret != 11;
  85 }
  86
  87 static void update_io_tick_disk(struct disk_util *du)
  88 {
  89         struct disk_util_stat __dus, *dus, *ldus;
  90         struct timespec t;
  91
  92         if (!du->users)
  93                 return;
  94         if (get_io_ticks(du, &__dus))
  95                 return;
  96
  97         dus = &du->dus;
  98         ldus = &du->last_dus;
  99
 100         dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
 101         dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
 102         dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
 103         dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
 104         dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
 105         dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
 106         dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
 107         dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
 108         dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
 109         dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
 110
 111         fio_gettime(&t, NULL);
 112         dus->s.msec += mtime_since(&du->time, &t);
 113         memcpy(&du->time, &t, sizeof(t));
 114         memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
 115 }
 116
 117 int update_io_ticks(void)
 118 {
 119         struct flist_head *entry;
 120         struct disk_util *du;
 121         int ret = 0;
 122
 123         dprint(FD_DISKUTIL, "update io ticks\n");
 124
 125         fio_sem_down(disk_util_sem);
 126
 127         if (!helper_should_exit()) {
 128                 flist_for_each(entry, &disk_list) {
 129                         du = flist_entry(entry, struct disk_util, list);
 130                         update_io_tick_disk(du);
 131                 }
 132         } else
 133                 ret = 1;
 134
 135         fio_sem_up(disk_util_sem);
 136         return ret;
 137 }
 138
 139 static struct disk_util *disk_util_exists(int major, int minor)
 140 {
 141         struct flist_head *entry;
 142         struct disk_util *du;
 143
 144         fio_sem_down(disk_util_sem);
 145
 146         flist_for_each(entry, &disk_list) {
 147                 du = flist_entry(entry, struct disk_util, list);
 148
 149                 if (major == du->major && minor == du->minor) {
 150                         fio_sem_up(disk_util_sem);
 151                         return du;
 152                 }
 153         }
 154
 155         fio_sem_up(disk_util_sem);
 156         return NULL;
 157 }
 158
 159 static int get_device_numbers(char *file_name, int *maj, int *min)
 160 {
 161         struct stat st;
 162         int majdev, mindev;
 163         char tempname[PATH_MAX], *p;
 164
 165         if (!lstat(file_name, &st)) {
 166                 if (S_ISBLK(st.st_mode)) {
 167                         majdev = major(st.st_rdev);
 168                         mindev = minor(st.st_rdev);
 169                 } else if (S_ISCHR(st.st_mode)) {
 170                         majdev = major(st.st_rdev);
 171                         mindev = minor(st.st_rdev);
 172                         if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
 173                                 return -1;
 174                 } else if (S_ISFIFO(st.st_mode))
 175                         return -1;
 176                 else {
 177                         majdev = major(st.st_dev);
 178                         mindev = minor(st.st_dev);
 179                 }
 180         } else {
 181                 /*
 182                  * must be a file, open "." in that path
 183                  */
 184                 snprintf(tempname, ARRAY_SIZE(tempname), "%s", file_name);
 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                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s", slavesdir,
 245                                 dirent->d_name);
 246                 /* Can we always assume that the slaves device entries
 247                  * are links to the real directories for the slave
 248                  * devices?
 249                  */
 250                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 251                 if (linklen < 0) {
 252                         perror("readlink() for slave device.");
 253                         closedir(dirhandle);
 254                         return;
 255                 }
 256                 slavepath[linklen] = '\0';
 257
 258                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s/dev",
 259                                 slavesdir, slavepath);
 260                 if (access(temppath, F_OK) != 0)
 261                         nowarn_snprintf(temppath, sizeof(temppath),
 262                                         "%s/%s/device/dev", slavesdir,
 263                                         slavepath);
 264                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 265                         perror("Error getting slave device numbers");
 266                         closedir(dirhandle);
 267                         return;
 268                 }
 269
 270                 /*
 271                  * See if this maj,min already exists
 272                  */
 273                 slavedu = disk_util_exists(majdev, mindev);
 274                 if (slavedu)
 275                         continue;
 276
 277                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s", slavesdir,
 278                                 slavepath);
 279                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 280                 slavedu = disk_util_exists(majdev, mindev);
 281
 282                 /* Should probably use an assert here. slavedu should
 283                  * always be present at this point. */
 284                 if (slavedu) {
 285                         slavedu->users++;
 286                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 287                 }
 288         }
 289
 290         closedir(dirhandle);
 291 }
 292
 293 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 294                                        int mindev, char *path)
 295 {
 296         struct disk_util *du, *__du;
 297         struct flist_head *entry;
 298         int l;
 299
 300         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 301
 302         du = smalloc(sizeof(*du));
 303         if (!du)
 304                 return NULL;
 305
 306         DRD_IGNORE_VAR(du->users);
 307         memset(du, 0, sizeof(*du));
 308         INIT_FLIST_HEAD(&du->list);
 309         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 310         if (l < 0 || l >= sizeof(du->path)) {
 311                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 312                         path, sizeof(du->path) - 1);
 313                 sfree(du);
 314                 return NULL;
 315         }
 316         snprintf((char *) du->dus.name, ARRAY_SIZE(du->dus.name), "%s",
 317                  basename(path));
 318         du->sysfs_root = strdup(path);
 319         du->major = majdev;
 320         du->minor = mindev;
 321         INIT_FLIST_HEAD(&du->slavelist);
 322         INIT_FLIST_HEAD(&du->slaves);
 323         du->lock = fio_sem_init(FIO_SEM_UNLOCKED);
 324         du->users = 0;
 325
 326         fio_sem_down(disk_util_sem);
 327
 328         flist_for_each(entry, &disk_list) {
 329                 __du = flist_entry(entry, struct disk_util, list);
 330
 331                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 332
 333                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 334                         disk_util_free(du);
 335                         fio_sem_up(disk_util_sem);
 336                         return __du;
 337                 }
 338         }
 339
 340         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 341
 342         fio_gettime(&du->time, NULL);
 343         get_io_ticks(du, &du->last_dus);
 344
 345         flist_add_tail(&du->list, &disk_list);
 346         fio_sem_up(disk_util_sem);
 347
 348         find_add_disk_slaves(td, path, du);
 349         return du;
 350 }
 351
 352 static int check_dev_match(int majdev, int mindev, char *path)
 353 {
 354         int major, minor;
 355
 356         if (read_block_dev_entry(path, &major, &minor))
 357                 return 1;
 358
 359         if (majdev == major && mindev == minor)
 360                 return 0;
 361
 362         return 1;
 363 }
 364
 365 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 366 {
 367         struct dirent *dir;
 368         struct stat st;
 369         int found = 0;
 370         DIR *D;
 371
 372         D = opendir(path);
 373         if (!D)
 374                 return 0;
 375
 376         while ((dir = readdir(D)) != NULL) {
 377                 char full_path[257];
 378
 379                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 380                         continue;
 381
 382                 sprintf(full_path, "%s/%s", path, dir->d_name);
 383
 384                 if (!strcmp(dir->d_name, "dev")) {
 385                         if (!check_dev_match(majdev, mindev, full_path)) {
 386                                 found = 1;
 387                                 break;
 388                         }
 389                 }
 390
 391                 if (link_ok) {
 392                         if (stat(full_path, &st) == -1) {
 393                                 perror("stat");
 394                                 break;
 395                         }
 396                 } else {
 397                         if (lstat(full_path, &st) == -1) {
 398                                 perror("stat");
 399                                 break;
 400                         }
 401                 }
 402
 403                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 404                         continue;
 405
 406                 found = find_block_dir(majdev, mindev, full_path, 0);
 407                 if (found) {
 408                         strcpy(path, full_path);
 409                         break;
 410                 }
 411         }
 412
 413         closedir(D);
 414         return found;
 415 }
 416
 417 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 418                                                    int majdev, int mindev,
 419                                                    char *path)
 420 {
 421         struct stat st;
 422         char tmp[PATH_MAX];
 423         char *p;
 424
 425         /*
 426          * If there's a ../queue/ directory there, we are inside a partition.
 427          * Check if that is the case and jump back. For loop/md/dm etc we
 428          * are already in the right spot.
 429          */
 430         sprintf(tmp, "%s/../queue", path);
 431         if (!stat(tmp, &st)) {
 432                 p = dirname(path);
 433                 sprintf(tmp, "%s/queue", p);
 434                 if (stat(tmp, &st)) {
 435                         log_err("unknown sysfs layout\n");
 436                         return NULL;
 437                 }
 438                 snprintf(tmp, ARRAY_SIZE(tmp), "%s", p);
 439                 sprintf(path, "%s", tmp);
 440         }
 441
 442         return disk_util_add(td, majdev, mindev, path);
 443 }
 444
 445 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 446                                                  char *filename)
 447 {
 448
 449         char foo[PATH_MAX];
 450         struct disk_util *du;
 451         int mindev, majdev;
 452
 453         if (get_device_numbers(filename, &majdev, &mindev))
 454                 return NULL;
 455
 456         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 457                         mindev);
 458
 459         du = disk_util_exists(majdev, mindev);
 460         if (du)
 461                 return du;
 462
 463         /*
 464          * for an fs without a device, we will repeatedly stat through
 465          * sysfs which can take oodles of time for thousands of files. so
 466          * cache the last lookup and compare with that before going through
 467          * everything again.
 468          */
 469         if (mindev == last_mindev && majdev == last_majdev)
 470                 return last_du;
 471
 472         last_mindev = mindev;
 473         last_majdev = majdev;
 474
 475         sprintf(foo, "/sys/block");
 476         if (!find_block_dir(majdev, mindev, foo, 1))
 477                 return NULL;
 478
 479         return __init_per_file_disk_util(td, majdev, mindev, foo);
 480 }
 481
 482 static struct disk_util *__init_disk_util(struct thread_data *td,
 483                                           struct fio_file *f)
 484 {
 485         return init_per_file_disk_util(td, f->file_name);
 486 }
 487
 488 void init_disk_util(struct thread_data *td)
 489 {
 490         struct fio_file *f;
 491         unsigned int i;
 492
 493         if (!td->o.do_disk_util ||
 494             td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
 495                 return;
 496
 497         for_each_file(td, f, i)
 498                 f->du = __init_disk_util(td, f);
 499 }
 500
 501 static void show_agg_stats(struct disk_util_agg *agg, int terse,
 502                            struct buf_output *out)
 503 {
 504         if (!agg->slavecount)
 505                 return;
 506
 507         if (!terse) {
 508                 log_buf(out, ", aggrios=%llu/%llu, aggrmerge=%llu/%llu, "
 509                          "aggrticks=%llu/%llu, aggrin_queue=%llu, "
 510                          "aggrutil=%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         } else {
 520                 log_buf(out, ";slaves;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 521                         (unsigned long long) agg->ios[0] / agg->slavecount,
 522                         (unsigned long long) agg->ios[1] / agg->slavecount,
 523                         (unsigned long long) agg->merges[0] / agg->slavecount,
 524                         (unsigned long long) agg->merges[1] / agg->slavecount,
 525                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 526                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 527                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 528                         agg->max_util.u.f);
 529         }
 530 }
 531
 532 static void aggregate_slaves_stats(struct disk_util *masterdu)
 533 {
 534         struct disk_util_agg *agg = &masterdu->agg;
 535         struct disk_util_stat *dus;
 536         struct flist_head *entry;
 537         struct disk_util *slavedu;
 538         double util;
 539
 540         flist_for_each(entry, &masterdu->slaves) {
 541                 slavedu = flist_entry(entry, struct disk_util, slavelist);
 542                 dus = &slavedu->dus;
 543                 agg->ios[0] += dus->s.ios[0];
 544                 agg->ios[1] += dus->s.ios[1];
 545                 agg->merges[0] += dus->s.merges[0];
 546                 agg->merges[1] += dus->s.merges[1];
 547                 agg->sectors[0] += dus->s.sectors[0];
 548                 agg->sectors[1] += dus->s.sectors[1];
 549                 agg->ticks[0] += dus->s.ticks[0];
 550                 agg->ticks[1] += dus->s.ticks[1];
 551                 agg->time_in_queue += dus->s.time_in_queue;
 552                 agg->slavecount++;
 553
 554                 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
 555                 /* System utilization is the utilization of the
 556                  * component with the highest utilization.
 557                  */
 558                 if (util > agg->max_util.u.f)
 559                         agg->max_util.u.f = util;
 560
 561         }
 562
 563         if (agg->max_util.u.f > 100.0)
 564                 agg->max_util.u.f = 100.0;
 565 }
 566
 567 void disk_util_prune_entries(void)
 568 {
 569         fio_sem_down(disk_util_sem);
 570
 571         while (!flist_empty(&disk_list)) {
 572                 struct disk_util *du;
 573
 574                 du = flist_first_entry(&disk_list, struct disk_util, list);
 575                 flist_del(&du->list);
 576                 disk_util_free(du);
 577         }
 578
 579         last_majdev = last_mindev = -1;
 580         fio_sem_up(disk_util_sem);
 581         fio_sem_remove(disk_util_sem);
 582 }
 583
 584 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 585                      int terse, struct buf_output *out)
 586 {
 587         double util = 0;
 588
 589         if (dus->s.msec)
 590                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 591         if (util > 100.0)
 592                 util = 100.0;
 593
 594         if (!terse) {
 595                 if (agg->slavecount)
 596                         log_buf(out, "  ");
 597
 598                 log_buf(out, "  %s: ios=%llu/%llu, merge=%llu/%llu, "
 599                          "ticks=%llu/%llu, in_queue=%llu, util=%3.2f%%",
 600                                 dus->name,
 601                                 (unsigned long long) dus->s.ios[0],
 602                                 (unsigned long long) dus->s.ios[1],
 603                                 (unsigned long long) dus->s.merges[0],
 604                                 (unsigned long long) dus->s.merges[1],
 605                                 (unsigned long long) dus->s.ticks[0],
 606                                 (unsigned long long) dus->s.ticks[1],
 607                                 (unsigned long long) dus->s.time_in_queue,
 608                                 util);
 609         } else {
 610                 log_buf(out, ";%s;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 611                                 dus->name,
 612                                 (unsigned long long) dus->s.ios[0],
 613                                 (unsigned long long) dus->s.ios[1],
 614                                 (unsigned long long) dus->s.merges[0],
 615                                 (unsigned long long) dus->s.merges[1],
 616                                 (unsigned long long) dus->s.ticks[0],
 617                                 (unsigned long long) dus->s.ticks[1],
 618                                 (unsigned long long) dus->s.time_in_queue,
 619                                 util);
 620         }
 621
 622         /*
 623          * If the device has slaves, aggregate the stats for
 624          * those slave devices also.
 625          */
 626         show_agg_stats(agg, terse, out);
 627
 628         if (!terse)
 629                 log_buf(out, "\n");
 630 }
 631
 632 void json_array_add_disk_util(struct disk_util_stat *dus,
 633                 struct disk_util_agg *agg, struct json_array *array)
 634 {
 635         struct json_object *obj;
 636         double util = 0;
 637
 638         if (dus->s.msec)
 639                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 640         if (util > 100.0)
 641                 util = 100.0;
 642
 643         obj = json_create_object();
 644         json_array_add_value_object(array, obj);
 645
 646         json_object_add_value_string(obj, "name", dus->name);
 647         json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
 648         json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
 649         json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
 650         json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
 651         json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
 652         json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
 653         json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
 654         json_object_add_value_float(obj, "util", util);
 655
 656         /*
 657          * If the device has slaves, aggregate the stats for
 658          * those slave devices also.
 659          */
 660         if (!agg->slavecount)
 661                 return;
 662         json_object_add_value_int(obj, "aggr_read_ios",
 663                                 agg->ios[0] / agg->slavecount);
 664         json_object_add_value_int(obj, "aggr_write_ios",
 665                                 agg->ios[1] / agg->slavecount);
 666         json_object_add_value_int(obj, "aggr_read_merges",
 667                                 agg->merges[0] / agg->slavecount);
 668         json_object_add_value_int(obj, "aggr_write_merge",
 669                                 agg->merges[1] / agg->slavecount);
 670         json_object_add_value_int(obj, "aggr_read_ticks",
 671                                 agg->ticks[0] / agg->slavecount);
 672         json_object_add_value_int(obj, "aggr_write_ticks",
 673                                 agg->ticks[1] / agg->slavecount);
 674         json_object_add_value_int(obj, "aggr_in_queue",
 675                                 agg->time_in_queue / agg->slavecount);
 676         json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
 677 }
 678
 679 static void json_object_add_disk_utils(struct json_object *obj,
 680                                        struct flist_head *head)
 681 {
 682         struct json_array *array = json_create_array();
 683         struct flist_head *entry;
 684         struct disk_util *du;
 685
 686         json_object_add_value_array(obj, "disk_util", array);
 687
 688         flist_for_each(entry, head) {
 689                 du = flist_entry(entry, struct disk_util, list);
 690
 691                 aggregate_slaves_stats(du);
 692                 json_array_add_disk_util(&du->dus, &du->agg, array);
 693         }
 694 }
 695
 696 void show_disk_util(int terse, struct json_object *parent,
 697                     struct buf_output *out)
 698 {
 699         struct flist_head *entry;
 700         struct disk_util *du;
 701         bool do_json;
 702
 703         if (!is_running_backend())
 704                 return;
 705
 706         fio_sem_down(disk_util_sem);
 707
 708         if (flist_empty(&disk_list)) {
 709                 fio_sem_up(disk_util_sem);
 710                 return;
 711         }
 712
 713         if ((output_format & FIO_OUTPUT_JSON) && parent)
 714                 do_json = true;
 715         else
 716                 do_json = false;
 717
 718         if (!terse && !do_json)
 719                 log_buf(out, "\nDisk stats (read/write):\n");
 720
 721         if (do_json)
 722                 json_object_add_disk_utils(parent, &disk_list);
 723         else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
 724                 flist_for_each(entry, &disk_list) {
 725                         du = flist_entry(entry, struct disk_util, list);
 726
 727                         aggregate_slaves_stats(du);
 728                         print_disk_util(&du->dus, &du->agg, terse, out);
 729                 }
 730         }
 731
 732         fio_sem_up(disk_util_sem);
 733 }
 734
 735 void setup_disk_util(void)
 736 {
 737         disk_util_sem = fio_sem_init(FIO_SEM_UNLOCKED);
 738 }