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         sfree(du);
  41 }
  42
  43 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
  44 {
  45         unsigned in_flight;
  46         unsigned long long sectors[2];
  47         char line[256];
  48         FILE *f;
  49         char *p;
  50         int ret;
  51
  52         dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
  53
  54         f = fopen(du->path, "r");
  55         if (!f)
  56                 return 1;
  57
  58         p = fgets(line, sizeof(line), f);
  59         if (!p) {
  60                 fclose(f);
  61                 return 1;
  62         }
  63
  64         dprint(FD_DISKUTIL, "%s: %s", du->path, p);
  65
  66         ret = sscanf(p, "%llu %llu %llu %llu %llu %llu %llu %llu %u %llu %llu\n",
  67                                 (unsigned long long *) &dus->s.ios[0],
  68                                 (unsigned long long *) &dus->s.merges[0],
  69                                 &sectors[0],
  70                                 (unsigned long long *) &dus->s.ticks[0],
  71                                 (unsigned long long *) &dus->s.ios[1],
  72                                 (unsigned long long *) &dus->s.merges[1],
  73                                 &sectors[1],
  74                                 (unsigned long long *) &dus->s.ticks[1],
  75                                 &in_flight,
  76                                 (unsigned long long *) &dus->s.io_ticks,
  77                                 (unsigned long long *) &dus->s.time_in_queue);
  78         fclose(f);
  79         dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
  80         dus->s.sectors[0] = sectors[0];
  81         dus->s.sectors[1] = sectors[1];
  82         return ret != 11;
  83 }
  84
  85 static void update_io_tick_disk(struct disk_util *du)
  86 {
  87         struct disk_util_stat __dus, *dus, *ldus;
  88         struct timeval t;
  89
  90         if (!du->users)
  91                 return;
  92         if (get_io_ticks(du, &__dus))
  93                 return;
  94
  95         dus = &du->dus;
  96         ldus = &du->last_dus;
  97
  98         dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
  99         dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
 100         dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
 101         dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
 102         dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
 103         dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
 104         dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
 105         dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
 106         dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
 107         dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
 108
 109         fio_gettime(&t, NULL);
 110         dus->s.msec += mtime_since(&du->time, &t);
 111         memcpy(&du->time, &t, sizeof(t));
 112         memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
 113 }
 114
 115 int update_io_ticks(void)
 116 {
 117         struct flist_head *entry;
 118         struct disk_util *du;
 119         int ret = 0;
 120
 121         dprint(FD_DISKUTIL, "update io ticks\n");
 122
 123         fio_mutex_down(disk_util_mutex);
 124
 125         if (!helper_should_exit()) {
 126                 flist_for_each(entry, &disk_list) {
 127                         du = flist_entry(entry, struct disk_util, list);
 128                         update_io_tick_disk(du);
 129                 }
 130         } else
 131                 ret = 1;
 132
 133         fio_mutex_up(disk_util_mutex);
 134         return ret;
 135 }
 136
 137 static struct disk_util *disk_util_exists(int major, int minor)
 138 {
 139         struct flist_head *entry;
 140         struct disk_util *du;
 141
 142         fio_mutex_down(disk_util_mutex);
 143
 144         flist_for_each(entry, &disk_list) {
 145                 du = flist_entry(entry, struct disk_util, list);
 146
 147                 if (major == du->major && minor == du->minor) {
 148                         fio_mutex_up(disk_util_mutex);
 149                         return du;
 150                 }
 151         }
 152
 153         fio_mutex_up(disk_util_mutex);
 154         return NULL;
 155 }
 156
 157 static int get_device_numbers(char *file_name, int *maj, int *min)
 158 {
 159         struct stat st;
 160         int majdev, mindev;
 161         char tempname[PATH_MAX], *p;
 162
 163         if (!lstat(file_name, &st)) {
 164                 if (S_ISBLK(st.st_mode)) {
 165                         majdev = major(st.st_rdev);
 166                         mindev = minor(st.st_rdev);
 167                 } else if (S_ISCHR(st.st_mode)) {
 168                         majdev = major(st.st_rdev);
 169                         mindev = minor(st.st_rdev);
 170                         if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
 171                                 return -1;
 172                 } else if (S_ISFIFO(st.st_mode))
 173                         return -1;
 174                 else {
 175                         majdev = major(st.st_dev);
 176                         mindev = minor(st.st_dev);
 177                 }
 178         } else {
 179                 /*
 180                  * must be a file, open "." in that path
 181                  */
 182                 tempname[PATH_MAX - 1] = '\0';
 183                 strncpy(tempname, file_name, PATH_MAX - 1);
 184                 p = dirname(tempname);
 185                 if (stat(p, &st)) {
 186                         perror("disk util stat");
 187                         return -1;
 188                 }
 189
 190                 majdev = major(st.st_dev);
 191                 mindev = minor(st.st_dev);
 192         }
 193
 194         *min = mindev;
 195         *maj = majdev;
 196
 197         return 0;
 198 }
 199
 200 static int read_block_dev_entry(char *path, int *maj, int *min)
 201 {
 202         char line[256], *p;
 203         FILE *f;
 204
 205         f = fopen(path, "r");
 206         if (!f) {
 207                 perror("open path");
 208                 return 1;
 209         }
 210
 211         p = fgets(line, sizeof(line), f);
 212         fclose(f);
 213
 214         if (!p)
 215                 return 1;
 216
 217         if (sscanf(p, "%u:%u", maj, min) != 2)
 218                 return 1;
 219
 220         return 0;
 221 }
 222
 223 static void find_add_disk_slaves(struct thread_data *td, char *path,
 224                                  struct disk_util *masterdu)
 225 {
 226         DIR *dirhandle = NULL;
 227         struct dirent *dirent = NULL;
 228         char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
 229         struct disk_util *slavedu = NULL;
 230         int majdev, mindev;
 231         ssize_t linklen;
 232
 233         sprintf(slavesdir, "%s/%s", path, "slaves");
 234         dirhandle = opendir(slavesdir);
 235         if (!dirhandle)
 236                 return;
 237
 238         while ((dirent = readdir(dirhandle)) != NULL) {
 239                 if (!strcmp(dirent->d_name, ".") ||
 240                     !strcmp(dirent->d_name, ".."))
 241                         continue;
 242
 243                 sprintf(temppath, "%s/%s", slavesdir, dirent->d_name);
 244                 /* Can we always assume that the slaves device entries
 245                  * are links to the real directories for the slave
 246                  * devices?
 247                  */
 248                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 249                 if (linklen  < 0) {
 250                         perror("readlink() for slave device.");
 251                         closedir(dirhandle);
 252                         return;
 253                 }
 254                 slavepath[linklen] = '\0';
 255
 256                 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
 257                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 258                         perror("Error getting slave device numbers.");
 259                         closedir(dirhandle);
 260                         return;
 261                 }
 262
 263                 /*
 264                  * See if this maj,min already exists
 265                  */
 266                 slavedu = disk_util_exists(majdev, mindev);
 267                 if (slavedu)
 268                         continue;
 269
 270                 sprintf(temppath, "%s/%s", slavesdir, slavepath);
 271                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 272                 slavedu = disk_util_exists(majdev, mindev);
 273
 274                 /* Should probably use an assert here. slavedu should
 275                  * always be present at this point. */
 276                 if (slavedu) {
 277                         slavedu->users++;
 278                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 279                 }
 280         }
 281
 282         closedir(dirhandle);
 283 }
 284
 285 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 286                                        int mindev, char *path)
 287 {
 288         struct disk_util *du, *__du;
 289         struct flist_head *entry;
 290         int l;
 291
 292         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 293
 294         du = smalloc(sizeof(*du));
 295         if (!du) {
 296                 log_err("fio: smalloc() pool exhausted\n");
 297                 return NULL;
 298         }
 299
 300         memset(du, 0, sizeof(*du));
 301         INIT_FLIST_HEAD(&du->list);
 302         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 303         if (l < 0 || l >= sizeof(du->path)) {
 304                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 305                         path, sizeof(du->path) - 1);
 306                 sfree(du);
 307                 return NULL;
 308         }
 309         strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
 310         du->sysfs_root = path;
 311         du->major = majdev;
 312         du->minor = mindev;
 313         INIT_FLIST_HEAD(&du->slavelist);
 314         INIT_FLIST_HEAD(&du->slaves);
 315         du->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 316         du->users = 0;
 317
 318         fio_mutex_down(disk_util_mutex);
 319
 320         flist_for_each(entry, &disk_list) {
 321                 __du = flist_entry(entry, struct disk_util, list);
 322
 323                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 324
 325                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 326                         disk_util_free(du);
 327                         fio_mutex_up(disk_util_mutex);
 328                         return __du;
 329                 }
 330         }
 331
 332         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 333
 334         fio_gettime(&du->time, NULL);
 335         get_io_ticks(du, &du->last_dus);
 336
 337         flist_add_tail(&du->list, &disk_list);
 338         fio_mutex_up(disk_util_mutex);
 339
 340         find_add_disk_slaves(td, path, du);
 341         return du;
 342 }
 343
 344 static int check_dev_match(int majdev, int mindev, char *path)
 345 {
 346         int major, minor;
 347
 348         if (read_block_dev_entry(path, &major, &minor))
 349                 return 1;
 350
 351         if (majdev == major && mindev == minor)
 352                 return 0;
 353
 354         return 1;
 355 }
 356
 357 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 358 {
 359         struct dirent *dir;
 360         struct stat st;
 361         int found = 0;
 362         DIR *D;
 363
 364         D = opendir(path);
 365         if (!D)
 366                 return 0;
 367
 368         while ((dir = readdir(D)) != NULL) {
 369                 char full_path[256];
 370
 371                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 372                         continue;
 373
 374                 sprintf(full_path, "%s/%s", path, dir->d_name);
 375
 376                 if (!strcmp(dir->d_name, "dev")) {
 377                         if (!check_dev_match(majdev, mindev, full_path)) {
 378                                 found = 1;
 379                                 break;
 380                         }
 381                 }
 382
 383                 if (link_ok) {
 384                         if (stat(full_path, &st) == -1) {
 385                                 perror("stat");
 386                                 break;
 387                         }
 388                 } else {
 389                         if (lstat(full_path, &st) == -1) {
 390                                 perror("stat");
 391                                 break;
 392                         }
 393                 }
 394
 395                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 396                         continue;
 397
 398                 found = find_block_dir(majdev, mindev, full_path, 0);
 399                 if (found) {
 400                         strcpy(path, full_path);
 401                         break;
 402                 }
 403         }
 404
 405         closedir(D);
 406         return found;
 407 }
 408
 409 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 410                                                    int majdev, int mindev,
 411                                                    char *path)
 412 {
 413         struct stat st;
 414         char tmp[PATH_MAX];
 415         char *p;
 416
 417         /*
 418          * If there's a ../queue/ directory there, we are inside a partition.
 419          * Check if that is the case and jump back. For loop/md/dm etc we
 420          * are already in the right spot.
 421          */
 422         sprintf(tmp, "%s/../queue", path);
 423         if (!stat(tmp, &st)) {
 424                 p = dirname(path);
 425                 sprintf(tmp, "%s/queue", p);
 426                 if (stat(tmp, &st)) {
 427                         log_err("unknown sysfs layout\n");
 428                         return NULL;
 429                 }
 430                 tmp[PATH_MAX - 1] = '\0';
 431                 strncpy(tmp, p, PATH_MAX - 1);
 432                 sprintf(path, "%s", tmp);
 433         }
 434
 435         if (td->o.ioscheduler && !td->sysfs_root)
 436                 td->sysfs_root = strdup(path);
 437
 438         return disk_util_add(td, majdev, mindev, path);
 439 }
 440
 441 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 442                                                  char *filename)
 443 {
 444
 445         char foo[PATH_MAX];
 446         struct disk_util *du;
 447         int mindev, majdev;
 448
 449         if (get_device_numbers(filename, &majdev, &mindev))
 450                 return NULL;
 451
 452         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 453                         mindev);
 454
 455         du = disk_util_exists(majdev, mindev);
 456         if (du) {
 457                 if (td->o.ioscheduler && !td->sysfs_root)
 458                         td->sysfs_root = strdup(du->sysfs_root);
 459
 460                 return du;
 461         }
 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_mutex_down(disk_util_mutex);
 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_mutex_up(disk_util_mutex);
 581         fio_mutex_remove(disk_util_mutex);
 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 (!disk_util_mutex)
 704                 return;
 705
 706         fio_mutex_down(disk_util_mutex);
 707
 708         if (flist_empty(&disk_list)) {
 709                 fio_mutex_up(disk_util_mutex);
 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_mutex_up(disk_util_mutex);
 733 }
 734
 735 void setup_disk_util(void)
 736 {
 737         disk_util_mutex = fio_mutex_init(FIO_MUTEX_UNLOCKED);
 738 }