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                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s", slavesdir,
 246                                 dirent->d_name);
 247                 /* Can we always assume that the slaves device entries
 248                  * are links to the real directories for the slave
 249                  * devices?
 250                  */
 251                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 252                 if (linklen < 0) {
 253                         perror("readlink() for slave device.");
 254                         closedir(dirhandle);
 255                         return;
 256                 }
 257                 slavepath[linklen] = '\0';
 258
 259                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s/dev",
 260                                 slavesdir, slavepath);
 261                 if (access(temppath, F_OK) != 0)
 262                         nowarn_snprintf(temppath, sizeof(temppath),
 263                                         "%s/%s/device/dev", slavesdir,
 264                                         slavepath);
 265                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 266                         perror("Error getting slave device numbers");
 267                         closedir(dirhandle);
 268                         return;
 269                 }
 270
 271                 /*
 272                  * See if this maj,min already exists
 273                  */
 274                 slavedu = disk_util_exists(majdev, mindev);
 275                 if (slavedu)
 276                         continue;
 277
 278                 nowarn_snprintf(temppath, sizeof(temppath), "%s/%s", slavesdir,
 279                                 slavepath);
 280                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 281                 slavedu = disk_util_exists(majdev, mindev);
 282
 283                 /* Should probably use an assert here. slavedu should
 284                  * always be present at this point. */
 285                 if (slavedu) {
 286                         slavedu->users++;
 287                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 288                 }
 289         }
 290
 291         closedir(dirhandle);
 292 }
 293
 294 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 295                                        int mindev, char *path)
 296 {
 297         struct disk_util *du, *__du;
 298         struct flist_head *entry;
 299         int l;
 300
 301         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 302
 303         du = smalloc(sizeof(*du));
 304         if (!du)
 305                 return NULL;
 306
 307         DRD_IGNORE_VAR(du->users);
 308         memset(du, 0, sizeof(*du));
 309         INIT_FLIST_HEAD(&du->list);
 310         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 311         if (l < 0 || l >= sizeof(du->path)) {
 312                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 313                         path, sizeof(du->path) - 1);
 314                 sfree(du);
 315                 return NULL;
 316         }
 317         strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
 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                 tmp[PATH_MAX - 1] = '\0';
 439                 strncpy(tmp, p, PATH_MAX - 1);
 440                 sprintf(path, "%s", tmp);
 441         }
 442
 443         return disk_util_add(td, majdev, mindev, path);
 444 }
 445
 446 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 447                                                  char *filename)
 448 {
 449
 450         char foo[PATH_MAX];
 451         struct disk_util *du;
 452         int mindev, majdev;
 453
 454         if (get_device_numbers(filename, &majdev, &mindev))
 455                 return NULL;
 456
 457         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 458                         mindev);
 459
 460         du = disk_util_exists(majdev, mindev);
 461         if (du)
 462                 return du;
 463
 464         /*
 465          * for an fs without a device, we will repeatedly stat through
 466          * sysfs which can take oodles of time for thousands of files. so
 467          * cache the last lookup and compare with that before going through
 468          * everything again.
 469          */
 470         if (mindev == last_mindev && majdev == last_majdev)
 471                 return last_du;
 472
 473         last_mindev = mindev;
 474         last_majdev = majdev;
 475
 476         sprintf(foo, "/sys/block");
 477         if (!find_block_dir(majdev, mindev, foo, 1))
 478                 return NULL;
 479
 480         return __init_per_file_disk_util(td, majdev, mindev, foo);
 481 }
 482
 483 static struct disk_util *__init_disk_util(struct thread_data *td,
 484                                           struct fio_file *f)
 485 {
 486         return init_per_file_disk_util(td, f->file_name);
 487 }
 488
 489 void init_disk_util(struct thread_data *td)
 490 {
 491         struct fio_file *f;
 492         unsigned int i;
 493
 494         if (!td->o.do_disk_util ||
 495             td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
 496                 return;
 497
 498         for_each_file(td, f, i)
 499                 f->du = __init_disk_util(td, f);
 500 }
 501
 502 static void show_agg_stats(struct disk_util_agg *agg, int terse,
 503                            struct buf_output *out)
 504 {
 505         if (!agg->slavecount)
 506                 return;
 507
 508         if (!terse) {
 509                 log_buf(out, ", aggrios=%llu/%llu, aggrmerge=%llu/%llu, "
 510                          "aggrticks=%llu/%llu, aggrin_queue=%llu, "
 511                          "aggrutil=%3.2f%%",
 512                         (unsigned long long) agg->ios[0] / agg->slavecount,
 513                         (unsigned long long) agg->ios[1] / agg->slavecount,
 514                         (unsigned long long) agg->merges[0] / agg->slavecount,
 515                         (unsigned long long) agg->merges[1] / agg->slavecount,
 516                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 517                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 518                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 519                         agg->max_util.u.f);
 520         } else {
 521                 log_buf(out, ";slaves;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 522                         (unsigned long long) agg->ios[0] / agg->slavecount,
 523                         (unsigned long long) agg->ios[1] / agg->slavecount,
 524                         (unsigned long long) agg->merges[0] / agg->slavecount,
 525                         (unsigned long long) agg->merges[1] / agg->slavecount,
 526                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 527                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 528                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 529                         agg->max_util.u.f);
 530         }
 531 }
 532
 533 static void aggregate_slaves_stats(struct disk_util *masterdu)
 534 {
 535         struct disk_util_agg *agg = &masterdu->agg;
 536         struct disk_util_stat *dus;
 537         struct flist_head *entry;
 538         struct disk_util *slavedu;
 539         double util;
 540
 541         flist_for_each(entry, &masterdu->slaves) {
 542                 slavedu = flist_entry(entry, struct disk_util, slavelist);
 543                 dus = &slavedu->dus;
 544                 agg->ios[0] += dus->s.ios[0];
 545                 agg->ios[1] += dus->s.ios[1];
 546                 agg->merges[0] += dus->s.merges[0];
 547                 agg->merges[1] += dus->s.merges[1];
 548                 agg->sectors[0] += dus->s.sectors[0];
 549                 agg->sectors[1] += dus->s.sectors[1];
 550                 agg->ticks[0] += dus->s.ticks[0];
 551                 agg->ticks[1] += dus->s.ticks[1];
 552                 agg->time_in_queue += dus->s.time_in_queue;
 553                 agg->slavecount++;
 554
 555                 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
 556                 /* System utilization is the utilization of the
 557                  * component with the highest utilization.
 558                  */
 559                 if (util > agg->max_util.u.f)
 560                         agg->max_util.u.f = util;
 561
 562         }
 563
 564         if (agg->max_util.u.f > 100.0)
 565                 agg->max_util.u.f = 100.0;
 566 }
 567
 568 void disk_util_prune_entries(void)
 569 {
 570         fio_sem_down(disk_util_sem);
 571
 572         while (!flist_empty(&disk_list)) {
 573                 struct disk_util *du;
 574
 575                 du = flist_first_entry(&disk_list, struct disk_util, list);
 576                 flist_del(&du->list);
 577                 disk_util_free(du);
 578         }
 579
 580         last_majdev = last_mindev = -1;
 581         fio_sem_up(disk_util_sem);
 582         fio_sem_remove(disk_util_sem);
 583 }
 584
 585 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 586                      int terse, struct buf_output *out)
 587 {
 588         double util = 0;
 589
 590         if (dus->s.msec)
 591                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 592         if (util > 100.0)
 593                 util = 100.0;
 594
 595         if (!terse) {
 596                 if (agg->slavecount)
 597                         log_buf(out, "  ");
 598
 599                 log_buf(out, "  %s: ios=%llu/%llu, merge=%llu/%llu, "
 600                          "ticks=%llu/%llu, in_queue=%llu, util=%3.2f%%",
 601                                 dus->name,
 602                                 (unsigned long long) dus->s.ios[0],
 603                                 (unsigned long long) dus->s.ios[1],
 604                                 (unsigned long long) dus->s.merges[0],
 605                                 (unsigned long long) dus->s.merges[1],
 606                                 (unsigned long long) dus->s.ticks[0],
 607                                 (unsigned long long) dus->s.ticks[1],
 608                                 (unsigned long long) dus->s.time_in_queue,
 609                                 util);
 610         } else {
 611                 log_buf(out, ";%s;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 612                                 dus->name,
 613                                 (unsigned long long) dus->s.ios[0],
 614                                 (unsigned long long) dus->s.ios[1],
 615                                 (unsigned long long) dus->s.merges[0],
 616                                 (unsigned long long) dus->s.merges[1],
 617                                 (unsigned long long) dus->s.ticks[0],
 618                                 (unsigned long long) dus->s.ticks[1],
 619                                 (unsigned long long) dus->s.time_in_queue,
 620                                 util);
 621         }
 622
 623         /*
 624          * If the device has slaves, aggregate the stats for
 625          * those slave devices also.
 626          */
 627         show_agg_stats(agg, terse, out);
 628
 629         if (!terse)
 630                 log_buf(out, "\n");
 631 }
 632
 633 void json_array_add_disk_util(struct disk_util_stat *dus,
 634                 struct disk_util_agg *agg, struct json_array *array)
 635 {
 636         struct json_object *obj;
 637         double util = 0;
 638
 639         if (dus->s.msec)
 640                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 641         if (util > 100.0)
 642                 util = 100.0;
 643
 644         obj = json_create_object();
 645         json_array_add_value_object(array, obj);
 646
 647         json_object_add_value_string(obj, "name", dus->name);
 648         json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
 649         json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
 650         json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
 651         json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
 652         json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
 653         json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
 654         json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
 655         json_object_add_value_float(obj, "util", util);
 656
 657         /*
 658          * If the device has slaves, aggregate the stats for
 659          * those slave devices also.
 660          */
 661         if (!agg->slavecount)
 662                 return;
 663         json_object_add_value_int(obj, "aggr_read_ios",
 664                                 agg->ios[0] / agg->slavecount);
 665         json_object_add_value_int(obj, "aggr_write_ios",
 666                                 agg->ios[1] / agg->slavecount);
 667         json_object_add_value_int(obj, "aggr_read_merges",
 668                                 agg->merges[0] / agg->slavecount);
 669         json_object_add_value_int(obj, "aggr_write_merge",
 670                                 agg->merges[1] / agg->slavecount);
 671         json_object_add_value_int(obj, "aggr_read_ticks",
 672                                 agg->ticks[0] / agg->slavecount);
 673         json_object_add_value_int(obj, "aggr_write_ticks",
 674                                 agg->ticks[1] / agg->slavecount);
 675         json_object_add_value_int(obj, "aggr_in_queue",
 676                                 agg->time_in_queue / agg->slavecount);
 677         json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
 678 }
 679
 680 static void json_object_add_disk_utils(struct json_object *obj,
 681                                        struct flist_head *head)
 682 {
 683         struct json_array *array = json_create_array();
 684         struct flist_head *entry;
 685         struct disk_util *du;
 686
 687         json_object_add_value_array(obj, "disk_util", array);
 688
 689         flist_for_each(entry, head) {
 690                 du = flist_entry(entry, struct disk_util, list);
 691
 692                 aggregate_slaves_stats(du);
 693                 json_array_add_disk_util(&du->dus, &du->agg, array);
 694         }
 695 }
 696
 697 void show_disk_util(int terse, struct json_object *parent,
 698                     struct buf_output *out)
 699 {
 700         struct flist_head *entry;
 701         struct disk_util *du;
 702         bool do_json;
 703
 704         if (!is_running_backend())
 705                 return;
 706
 707         fio_sem_down(disk_util_sem);
 708
 709         if (flist_empty(&disk_list)) {
 710                 fio_sem_up(disk_util_sem);
 711                 return;
 712         }
 713
 714         if ((output_format & FIO_OUTPUT_JSON) && parent)
 715                 do_json = true;
 716         else
 717                 do_json = false;
 718
 719         if (!terse && !do_json)
 720                 log_buf(out, "\nDisk stats (read/write):\n");
 721
 722         if (do_json)
 723                 json_object_add_disk_utils(parent, &disk_list);
 724         else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
 725                 flist_for_each(entry, &disk_list) {
 726                         du = flist_entry(entry, struct disk_util, list);
 727
 728                         aggregate_slaves_stats(du);
 729                         print_disk_util(&du->dus, &du->agg, terse, out);
 730                 }
 731         }
 732
 733         fio_sem_up(disk_util_sem);
 734 }
 735
 736 void setup_disk_util(void)
 737 {
 738         disk_util_sem = fio_sem_init(FIO_SEM_UNLOCKED);
 739 }