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                 tempname[PATH_MAX - 1] = '\0';
 185                 strncpy(tempname, file_name, PATH_MAX - 1);
 186                 p = dirname(tempname);
 187                 if (stat(p, &st)) {
 188                         perror("disk util stat");
 189                         return -1;
 190                 }
 191
 192                 majdev = major(st.st_dev);
 193                 mindev = minor(st.st_dev);
 194         }
 195
 196         *min = mindev;
 197         *maj = majdev;
 198
 199         return 0;
 200 }
 201
 202 static int read_block_dev_entry(char *path, int *maj, int *min)
 203 {
 204         char line[256], *p;
 205         FILE *f;
 206
 207         f = fopen(path, "r");
 208         if (!f) {
 209                 perror("open path");
 210                 return 1;
 211         }
 212
 213         p = fgets(line, sizeof(line), f);
 214         fclose(f);
 215
 216         if (!p)
 217                 return 1;
 218
 219         if (sscanf(p, "%u:%u", maj, min) != 2)
 220                 return 1;
 221
 222         return 0;
 223 }
 224
 225 static void find_add_disk_slaves(struct thread_data *td, char *path,
 226                                  struct disk_util *masterdu)
 227 {
 228         DIR *dirhandle = NULL;
 229         struct dirent *dirent = NULL;
 230         char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
 231         struct disk_util *slavedu = NULL;
 232         int majdev, mindev;
 233         ssize_t linklen;
 234
 235         sprintf(slavesdir, "%s/%s", path, "slaves");
 236         dirhandle = opendir(slavesdir);
 237         if (!dirhandle)
 238                 return;
 239
 240         while ((dirent = readdir(dirhandle)) != NULL) {
 241                 if (!strcmp(dirent->d_name, ".") ||
 242                     !strcmp(dirent->d_name, ".."))
 243                         continue;
 244
 245                 sprintf(temppath, "%s/%s", slavesdir, 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                 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
 259                 if (access(temppath, F_OK) != 0)
 260                         sprintf(temppath, "%s/%s/device/dev", slavesdir, slavepath);
 261                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 262                         perror("Error getting slave device numbers");
 263                         closedir(dirhandle);
 264                         return;
 265                 }
 266
 267                 /*
 268                  * See if this maj,min already exists
 269                  */
 270                 slavedu = disk_util_exists(majdev, mindev);
 271                 if (slavedu)
 272                         continue;
 273
 274                 sprintf(temppath, "%s/%s", slavesdir, slavepath);
 275                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 276                 slavedu = disk_util_exists(majdev, mindev);
 277
 278                 /* Should probably use an assert here. slavedu should
 279                  * always be present at this point. */
 280                 if (slavedu) {
 281                         slavedu->users++;
 282                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 283                 }
 284         }
 285
 286         closedir(dirhandle);
 287 }
 288
 289 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 290                                        int mindev, char *path)
 291 {
 292         struct disk_util *du, *__du;
 293         struct flist_head *entry;
 294         int l;
 295
 296         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 297
 298         du = smalloc(sizeof(*du));
 299         if (!du)
 300                 return NULL;
 301
 302         DRD_IGNORE_VAR(du->users);
 303         memset(du, 0, sizeof(*du));
 304         INIT_FLIST_HEAD(&du->list);
 305         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 306         if (l < 0 || l >= sizeof(du->path)) {
 307                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 308                         path, sizeof(du->path) - 1);
 309                 sfree(du);
 310                 return NULL;
 311         }
 312         strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
 313         du->sysfs_root = strdup(path);
 314         du->major = majdev;
 315         du->minor = mindev;
 316         INIT_FLIST_HEAD(&du->slavelist);
 317         INIT_FLIST_HEAD(&du->slaves);
 318         du->lock = fio_sem_init(FIO_SEM_UNLOCKED);
 319         du->users = 0;
 320
 321         fio_sem_down(disk_util_sem);
 322
 323         flist_for_each(entry, &disk_list) {
 324                 __du = flist_entry(entry, struct disk_util, list);
 325
 326                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 327
 328                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 329                         disk_util_free(du);
 330                         fio_sem_up(disk_util_sem);
 331                         return __du;
 332                 }
 333         }
 334
 335         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 336
 337         fio_gettime(&du->time, NULL);
 338         get_io_ticks(du, &du->last_dus);
 339
 340         flist_add_tail(&du->list, &disk_list);
 341         fio_sem_up(disk_util_sem);
 342
 343         find_add_disk_slaves(td, path, du);
 344         return du;
 345 }
 346
 347 static int check_dev_match(int majdev, int mindev, char *path)
 348 {
 349         int major, minor;
 350
 351         if (read_block_dev_entry(path, &major, &minor))
 352                 return 1;
 353
 354         if (majdev == major && mindev == minor)
 355                 return 0;
 356
 357         return 1;
 358 }
 359
 360 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 361 {
 362         struct dirent *dir;
 363         struct stat st;
 364         int found = 0;
 365         DIR *D;
 366
 367         D = opendir(path);
 368         if (!D)
 369                 return 0;
 370
 371         while ((dir = readdir(D)) != NULL) {
 372                 char full_path[257];
 373
 374                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 375                         continue;
 376
 377                 sprintf(full_path, "%s/%s", path, dir->d_name);
 378
 379                 if (!strcmp(dir->d_name, "dev")) {
 380                         if (!check_dev_match(majdev, mindev, full_path)) {
 381                                 found = 1;
 382                                 break;
 383                         }
 384                 }
 385
 386                 if (link_ok) {
 387                         if (stat(full_path, &st) == -1) {
 388                                 perror("stat");
 389                                 break;
 390                         }
 391                 } else {
 392                         if (lstat(full_path, &st) == -1) {
 393                                 perror("stat");
 394                                 break;
 395                         }
 396                 }
 397
 398                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 399                         continue;
 400
 401                 found = find_block_dir(majdev, mindev, full_path, 0);
 402                 if (found) {
 403                         strcpy(path, full_path);
 404                         break;
 405                 }
 406         }
 407
 408         closedir(D);
 409         return found;
 410 }
 411
 412 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 413                                                    int majdev, int mindev,
 414                                                    char *path)
 415 {
 416         struct stat st;
 417         char tmp[PATH_MAX];
 418         char *p;
 419
 420         /*
 421          * If there's a ../queue/ directory there, we are inside a partition.
 422          * Check if that is the case and jump back. For loop/md/dm etc we
 423          * are already in the right spot.
 424          */
 425         sprintf(tmp, "%s/../queue", path);
 426         if (!stat(tmp, &st)) {
 427                 p = dirname(path);
 428                 sprintf(tmp, "%s/queue", p);
 429                 if (stat(tmp, &st)) {
 430                         log_err("unknown sysfs layout\n");
 431                         return NULL;
 432                 }
 433                 tmp[PATH_MAX - 1] = '\0';
 434                 strncpy(tmp, p, PATH_MAX - 1);
 435                 sprintf(path, "%s", tmp);
 436         }
 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                 return du;
 458
 459         /*
 460          * for an fs without a device, we will repeatedly stat through
 461          * sysfs which can take oodles of time for thousands of files. so
 462          * cache the last lookup and compare with that before going through
 463          * everything again.
 464          */
 465         if (mindev == last_mindev && majdev == last_majdev)
 466                 return last_du;
 467
 468         last_mindev = mindev;
 469         last_majdev = majdev;
 470
 471         sprintf(foo, "/sys/block");
 472         if (!find_block_dir(majdev, mindev, foo, 1))
 473                 return NULL;
 474
 475         return __init_per_file_disk_util(td, majdev, mindev, foo);
 476 }
 477
 478 static struct disk_util *__init_disk_util(struct thread_data *td,
 479                                           struct fio_file *f)
 480 {
 481         return init_per_file_disk_util(td, f->file_name);
 482 }
 483
 484 void init_disk_util(struct thread_data *td)
 485 {
 486         struct fio_file *f;
 487         unsigned int i;
 488
 489         if (!td->o.do_disk_util ||
 490             td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
 491                 return;
 492
 493         for_each_file(td, f, i)
 494                 f->du = __init_disk_util(td, f);
 495 }
 496
 497 static void show_agg_stats(struct disk_util_agg *agg, int terse,
 498                            struct buf_output *out)
 499 {
 500         if (!agg->slavecount)
 501                 return;
 502
 503         if (!terse) {
 504                 log_buf(out, ", 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_buf(out, ";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_sem_down(disk_util_sem);
 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_sem_up(disk_util_sem);
 577         fio_sem_remove(disk_util_sem);
 578 }
 579
 580 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 581                      int terse, struct buf_output *out)
 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_buf(out, "  ");
 593
 594                 log_buf(out, "  %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_buf(out, ";%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, out);
 623
 624         if (!terse)
 625                 log_buf(out, "\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                     struct buf_output *out)
 694 {
 695         struct flist_head *entry;
 696         struct disk_util *du;
 697         bool do_json;
 698
 699         if (!disk_util_sem)
 700                 return;
 701
 702         fio_sem_down(disk_util_sem);
 703
 704         if (flist_empty(&disk_list)) {
 705                 fio_sem_up(disk_util_sem);
 706                 return;
 707         }
 708
 709         if ((output_format & FIO_OUTPUT_JSON) && parent)
 710                 do_json = true;
 711         else
 712                 do_json = false;
 713
 714         if (!terse && !do_json)
 715                 log_buf(out, "\nDisk stats (read/write):\n");
 716
 717         if (do_json)
 718                 json_object_add_disk_utils(parent, &disk_list);
 719         else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
 720                 flist_for_each(entry, &disk_list) {
 721                         du = flist_entry(entry, struct disk_util, list);
 722
 723                         aggregate_slaves_stats(du);
 724                         print_disk_util(&du->dus, &du->agg, terse, out);
 725                 }
 726         }
 727
 728         fio_sem_up(disk_util_sem);
 729 }
 730
 731 void setup_disk_util(void)
 732 {
 733         disk_util_sem = fio_sem_init(FIO_SEM_UNLOCKED);
 734 }