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