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 <sys/sysmacros.h>
   7 #include <dirent.h>
   8 #include <libgen.h>
   9 #include <math.h>
  10 #include <assert.h>
  11 #ifdef CONFIG_VALGRIND_DEV
  12 #include <valgrind/drd.h>
  13 #else
  14 #define DRD_IGNORE_VAR(x) do { } while (0)
  15 #endif
  16
  17 #include "fio.h"
  18 #include "smalloc.h"
  19 #include "diskutil.h"
  20 #include "helper_thread.h"
  21
  22 static int last_majdev, last_mindev;
  23 static struct disk_util *last_du;
  24
  25 static struct fio_sem *disk_util_sem;
  26
  27 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
  28                 int majdev, int mindev, char *path);
  29
  30 static void disk_util_free(struct disk_util *du)
  31 {
  32         if (du == last_du)
  33                 last_du = NULL;
  34
  35         while (!flist_empty(&du->slaves)) {
  36                 struct disk_util *slave;
  37
  38                 slave = flist_first_entry(&du->slaves, struct disk_util, slavelist);
  39                 flist_del(&slave->slavelist);
  40                 slave->users--;
  41         }
  42
  43         fio_sem_remove(du->lock);
  44         free(du->sysfs_root);
  45         sfree(du);
  46 }
  47
  48 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
  49 {
  50         unsigned in_flight;
  51         unsigned long long sectors[2];
  52         char line[256];
  53         FILE *f;
  54         char *p;
  55         int ret;
  56
  57         dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
  58
  59         f = fopen(du->path, "r");
  60         if (!f)
  61                 return 1;
  62
  63         p = fgets(line, sizeof(line), f);
  64         if (!p) {
  65                 fclose(f);
  66                 return 1;
  67         }
  68
  69         dprint(FD_DISKUTIL, "%s: %s", du->path, p);
  70
  71         ret = sscanf(p, "%llu %llu %llu %llu %llu %llu %llu %llu %u %llu %llu\n",
  72                                 (unsigned long long *) &dus->s.ios[0],
  73                                 (unsigned long long *) &dus->s.merges[0],
  74                                 &sectors[0],
  75                                 (unsigned long long *) &dus->s.ticks[0],
  76                                 (unsigned long long *) &dus->s.ios[1],
  77                                 (unsigned long long *) &dus->s.merges[1],
  78                                 &sectors[1],
  79                                 (unsigned long long *) &dus->s.ticks[1],
  80                                 &in_flight,
  81                                 (unsigned long long *) &dus->s.io_ticks,
  82                                 (unsigned long long *) &dus->s.time_in_queue);
  83         fclose(f);
  84         dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
  85         dus->s.sectors[0] = sectors[0];
  86         dus->s.sectors[1] = sectors[1];
  87         return ret != 11;
  88 }
  89
  90 static void update_io_tick_disk(struct disk_util *du)
  91 {
  92         struct disk_util_stat __dus, *dus, *ldus;
  93         struct timespec t;
  94
  95         if (!du->users)
  96                 return;
  97         if (get_io_ticks(du, &__dus))
  98                 return;
  99
 100         dus = &du->dus;
 101         ldus = &du->last_dus;
 102
 103         dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
 104         dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
 105         dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
 106         dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
 107         dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
 108         dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
 109         dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
 110         dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
 111         dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
 112         dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
 113
 114         fio_gettime(&t, NULL);
 115         dus->s.msec += mtime_since(&du->time, &t);
 116         memcpy(&du->time, &t, sizeof(t));
 117         memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
 118 }
 119
 120 int update_io_ticks(void)
 121 {
 122         struct flist_head *entry;
 123         struct disk_util *du;
 124         int ret = 0;
 125
 126         dprint(FD_DISKUTIL, "update io ticks\n");
 127
 128         fio_sem_down(disk_util_sem);
 129
 130         if (!helper_should_exit()) {
 131                 flist_for_each(entry, &disk_list) {
 132                         du = flist_entry(entry, struct disk_util, list);
 133                         update_io_tick_disk(du);
 134                 }
 135         } else
 136                 ret = 1;
 137
 138         fio_sem_up(disk_util_sem);
 139         return ret;
 140 }
 141
 142 static struct disk_util *disk_util_exists(int major, int minor)
 143 {
 144         struct flist_head *entry;
 145         struct disk_util *du;
 146
 147         fio_sem_down(disk_util_sem);
 148
 149         flist_for_each(entry, &disk_list) {
 150                 du = flist_entry(entry, struct disk_util, list);
 151
 152                 if (major == du->major && minor == du->minor) {
 153                         fio_sem_up(disk_util_sem);
 154                         return du;
 155                 }
 156         }
 157
 158         fio_sem_up(disk_util_sem);
 159         return NULL;
 160 }
 161
 162 static int get_device_numbers(char *file_name, int *maj, int *min)
 163 {
 164         struct stat st;
 165         int majdev, mindev;
 166         char tempname[PATH_MAX], *p;
 167
 168         if (!lstat(file_name, &st)) {
 169                 if (S_ISBLK(st.st_mode)) {
 170                         majdev = major(st.st_rdev);
 171                         mindev = minor(st.st_rdev);
 172                 } else if (S_ISCHR(st.st_mode)) {
 173                         majdev = major(st.st_rdev);
 174                         mindev = minor(st.st_rdev);
 175                         if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
 176                                 return -1;
 177                 } else if (S_ISFIFO(st.st_mode))
 178                         return -1;
 179                 else {
 180                         majdev = major(st.st_dev);
 181                         mindev = minor(st.st_dev);
 182                 }
 183         } else {
 184                 /*
 185                  * must be a file, open "." in that path
 186                  */
 187                 tempname[PATH_MAX - 1] = '\0';
 188                 strncpy(tempname, file_name, PATH_MAX - 1);
 189                 p = dirname(tempname);
 190                 if (stat(p, &st)) {
 191                         perror("disk util stat");
 192                         return -1;
 193                 }
 194
 195                 majdev = major(st.st_dev);
 196                 mindev = minor(st.st_dev);
 197         }
 198
 199         *min = mindev;
 200         *maj = majdev;
 201
 202         return 0;
 203 }
 204
 205 static int read_block_dev_entry(char *path, int *maj, int *min)
 206 {
 207         char line[256], *p;
 208         FILE *f;
 209
 210         f = fopen(path, "r");
 211         if (!f) {
 212                 perror("open path");
 213                 return 1;
 214         }
 215
 216         p = fgets(line, sizeof(line), f);
 217         fclose(f);
 218
 219         if (!p)
 220                 return 1;
 221
 222         if (sscanf(p, "%u:%u", maj, min) != 2)
 223                 return 1;
 224
 225         return 0;
 226 }
 227
 228 static void find_add_disk_slaves(struct thread_data *td, char *path,
 229                                  struct disk_util *masterdu)
 230 {
 231         DIR *dirhandle = NULL;
 232         struct dirent *dirent = NULL;
 233         char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
 234         struct disk_util *slavedu = NULL;
 235         int majdev, mindev;
 236         ssize_t linklen;
 237
 238         sprintf(slavesdir, "%s/%s", path, "slaves");
 239         dirhandle = opendir(slavesdir);
 240         if (!dirhandle)
 241                 return;
 242
 243         while ((dirent = readdir(dirhandle)) != NULL) {
 244                 if (!strcmp(dirent->d_name, ".") ||
 245                     !strcmp(dirent->d_name, ".."))
 246                         continue;
 247
 248                 sprintf(temppath, "%s/%s", slavesdir, dirent->d_name);
 249                 /* Can we always assume that the slaves device entries
 250                  * are links to the real directories for the slave
 251                  * devices?
 252                  */
 253                 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
 254                 if (linklen < 0) {
 255                         perror("readlink() for slave device.");
 256                         closedir(dirhandle);
 257                         return;
 258                 }
 259                 slavepath[linklen] = '\0';
 260
 261                 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
 262                 if (access(temppath, F_OK) != 0)
 263                         sprintf(temppath, "%s/%s/device/dev", slavesdir, slavepath);
 264                 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
 265                         perror("Error getting slave device numbers");
 266                         closedir(dirhandle);
 267                         return;
 268                 }
 269
 270                 /*
 271                  * See if this maj,min already exists
 272                  */
 273                 slavedu = disk_util_exists(majdev, mindev);
 274                 if (slavedu)
 275                         continue;
 276
 277                 sprintf(temppath, "%s/%s", slavesdir, slavepath);
 278                 __init_per_file_disk_util(td, majdev, mindev, temppath);
 279                 slavedu = disk_util_exists(majdev, mindev);
 280
 281                 /* Should probably use an assert here. slavedu should
 282                  * always be present at this point. */
 283                 if (slavedu) {
 284                         slavedu->users++;
 285                         flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
 286                 }
 287         }
 288
 289         closedir(dirhandle);
 290 }
 291
 292 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
 293                                        int mindev, char *path)
 294 {
 295         struct disk_util *du, *__du;
 296         struct flist_head *entry;
 297         int l;
 298
 299         dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
 300
 301         du = smalloc(sizeof(*du));
 302         if (!du)
 303                 return NULL;
 304
 305         DRD_IGNORE_VAR(du->users);
 306         memset(du, 0, sizeof(*du));
 307         INIT_FLIST_HEAD(&du->list);
 308         l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
 309         if (l < 0 || l >= sizeof(du->path)) {
 310                 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
 311                         path, sizeof(du->path) - 1);
 312                 sfree(du);
 313                 return NULL;
 314         }
 315         strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
 316         du->sysfs_root = strdup(path);
 317         du->major = majdev;
 318         du->minor = mindev;
 319         INIT_FLIST_HEAD(&du->slavelist);
 320         INIT_FLIST_HEAD(&du->slaves);
 321         du->lock = fio_sem_init(FIO_SEM_UNLOCKED);
 322         du->users = 0;
 323
 324         fio_sem_down(disk_util_sem);
 325
 326         flist_for_each(entry, &disk_list) {
 327                 __du = flist_entry(entry, struct disk_util, list);
 328
 329                 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
 330
 331                 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
 332                         disk_util_free(du);
 333                         fio_sem_up(disk_util_sem);
 334                         return __du;
 335                 }
 336         }
 337
 338         dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
 339
 340         fio_gettime(&du->time, NULL);
 341         get_io_ticks(du, &du->last_dus);
 342
 343         flist_add_tail(&du->list, &disk_list);
 344         fio_sem_up(disk_util_sem);
 345
 346         find_add_disk_slaves(td, path, du);
 347         return du;
 348 }
 349
 350 static int check_dev_match(int majdev, int mindev, char *path)
 351 {
 352         int major, minor;
 353
 354         if (read_block_dev_entry(path, &major, &minor))
 355                 return 1;
 356
 357         if (majdev == major && mindev == minor)
 358                 return 0;
 359
 360         return 1;
 361 }
 362
 363 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
 364 {
 365         struct dirent *dir;
 366         struct stat st;
 367         int found = 0;
 368         DIR *D;
 369
 370         D = opendir(path);
 371         if (!D)
 372                 return 0;
 373
 374         while ((dir = readdir(D)) != NULL) {
 375                 char full_path[257];
 376
 377                 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
 378                         continue;
 379
 380                 sprintf(full_path, "%s/%s", path, dir->d_name);
 381
 382                 if (!strcmp(dir->d_name, "dev")) {
 383                         if (!check_dev_match(majdev, mindev, full_path)) {
 384                                 found = 1;
 385                                 break;
 386                         }
 387                 }
 388
 389                 if (link_ok) {
 390                         if (stat(full_path, &st) == -1) {
 391                                 perror("stat");
 392                                 break;
 393                         }
 394                 } else {
 395                         if (lstat(full_path, &st) == -1) {
 396                                 perror("stat");
 397                                 break;
 398                         }
 399                 }
 400
 401                 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
 402                         continue;
 403
 404                 found = find_block_dir(majdev, mindev, full_path, 0);
 405                 if (found) {
 406                         strcpy(path, full_path);
 407                         break;
 408                 }
 409         }
 410
 411         closedir(D);
 412         return found;
 413 }
 414
 415 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
 416                                                    int majdev, int mindev,
 417                                                    char *path)
 418 {
 419         struct stat st;
 420         char tmp[PATH_MAX];
 421         char *p;
 422
 423         /*
 424          * If there's a ../queue/ directory there, we are inside a partition.
 425          * Check if that is the case and jump back. For loop/md/dm etc we
 426          * are already in the right spot.
 427          */
 428         sprintf(tmp, "%s/../queue", path);
 429         if (!stat(tmp, &st)) {
 430                 p = dirname(path);
 431                 sprintf(tmp, "%s/queue", p);
 432                 if (stat(tmp, &st)) {
 433                         log_err("unknown sysfs layout\n");
 434                         return NULL;
 435                 }
 436                 tmp[PATH_MAX - 1] = '\0';
 437                 strncpy(tmp, p, PATH_MAX - 1);
 438                 sprintf(path, "%s", tmp);
 439         }
 440
 441         return disk_util_add(td, majdev, mindev, path);
 442 }
 443
 444 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
 445                                                  char *filename)
 446 {
 447
 448         char foo[PATH_MAX];
 449         struct disk_util *du;
 450         int mindev, majdev;
 451
 452         if (get_device_numbers(filename, &majdev, &mindev))
 453                 return NULL;
 454
 455         dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
 456                         mindev);
 457
 458         du = disk_util_exists(majdev, mindev);
 459         if (du)
 460                 return du;
 461
 462         /*
 463          * for an fs without a device, we will repeatedly stat through
 464          * sysfs which can take oodles of time for thousands of files. so
 465          * cache the last lookup and compare with that before going through
 466          * everything again.
 467          */
 468         if (mindev == last_mindev && majdev == last_majdev)
 469                 return last_du;
 470
 471         last_mindev = mindev;
 472         last_majdev = majdev;
 473
 474         sprintf(foo, "/sys/block");
 475         if (!find_block_dir(majdev, mindev, foo, 1))
 476                 return NULL;
 477
 478         return __init_per_file_disk_util(td, majdev, mindev, foo);
 479 }
 480
 481 static struct disk_util *__init_disk_util(struct thread_data *td,
 482                                           struct fio_file *f)
 483 {
 484         return init_per_file_disk_util(td, f->file_name);
 485 }
 486
 487 void init_disk_util(struct thread_data *td)
 488 {
 489         struct fio_file *f;
 490         unsigned int i;
 491
 492         if (!td->o.do_disk_util ||
 493             td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
 494                 return;
 495
 496         for_each_file(td, f, i)
 497                 f->du = __init_disk_util(td, f);
 498 }
 499
 500 static void show_agg_stats(struct disk_util_agg *agg, int terse,
 501                            struct buf_output *out)
 502 {
 503         if (!agg->slavecount)
 504                 return;
 505
 506         if (!terse) {
 507                 log_buf(out, ", aggrios=%llu/%llu, aggrmerge=%llu/%llu, "
 508                          "aggrticks=%llu/%llu, aggrin_queue=%llu, "
 509                          "aggrutil=%3.2f%%",
 510                         (unsigned long long) agg->ios[0] / agg->slavecount,
 511                         (unsigned long long) agg->ios[1] / agg->slavecount,
 512                         (unsigned long long) agg->merges[0] / agg->slavecount,
 513                         (unsigned long long) agg->merges[1] / agg->slavecount,
 514                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 515                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 516                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 517                         agg->max_util.u.f);
 518         } else {
 519                 log_buf(out, ";slaves;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 520                         (unsigned long long) agg->ios[0] / agg->slavecount,
 521                         (unsigned long long) agg->ios[1] / agg->slavecount,
 522                         (unsigned long long) agg->merges[0] / agg->slavecount,
 523                         (unsigned long long) agg->merges[1] / agg->slavecount,
 524                         (unsigned long long) agg->ticks[0] / agg->slavecount,
 525                         (unsigned long long) agg->ticks[1] / agg->slavecount,
 526                         (unsigned long long) agg->time_in_queue / agg->slavecount,
 527                         agg->max_util.u.f);
 528         }
 529 }
 530
 531 static void aggregate_slaves_stats(struct disk_util *masterdu)
 532 {
 533         struct disk_util_agg *agg = &masterdu->agg;
 534         struct disk_util_stat *dus;
 535         struct flist_head *entry;
 536         struct disk_util *slavedu;
 537         double util;
 538
 539         flist_for_each(entry, &masterdu->slaves) {
 540                 slavedu = flist_entry(entry, struct disk_util, slavelist);
 541                 dus = &slavedu->dus;
 542                 agg->ios[0] += dus->s.ios[0];
 543                 agg->ios[1] += dus->s.ios[1];
 544                 agg->merges[0] += dus->s.merges[0];
 545                 agg->merges[1] += dus->s.merges[1];
 546                 agg->sectors[0] += dus->s.sectors[0];
 547                 agg->sectors[1] += dus->s.sectors[1];
 548                 agg->ticks[0] += dus->s.ticks[0];
 549                 agg->ticks[1] += dus->s.ticks[1];
 550                 agg->time_in_queue += dus->s.time_in_queue;
 551                 agg->slavecount++;
 552
 553                 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
 554                 /* System utilization is the utilization of the
 555                  * component with the highest utilization.
 556                  */
 557                 if (util > agg->max_util.u.f)
 558                         agg->max_util.u.f = util;
 559
 560         }
 561
 562         if (agg->max_util.u.f > 100.0)
 563                 agg->max_util.u.f = 100.0;
 564 }
 565
 566 void disk_util_prune_entries(void)
 567 {
 568         fio_sem_down(disk_util_sem);
 569
 570         while (!flist_empty(&disk_list)) {
 571                 struct disk_util *du;
 572
 573                 du = flist_first_entry(&disk_list, struct disk_util, list);
 574                 flist_del(&du->list);
 575                 disk_util_free(du);
 576         }
 577
 578         last_majdev = last_mindev = -1;
 579         fio_sem_up(disk_util_sem);
 580         fio_sem_remove(disk_util_sem);
 581 }
 582
 583 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
 584                      int terse, struct buf_output *out)
 585 {
 586         double util = 0;
 587
 588         if (dus->s.msec)
 589                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 590         if (util > 100.0)
 591                 util = 100.0;
 592
 593         if (!terse) {
 594                 if (agg->slavecount)
 595                         log_buf(out, "  ");
 596
 597                 log_buf(out, "  %s: ios=%llu/%llu, merge=%llu/%llu, "
 598                          "ticks=%llu/%llu, in_queue=%llu, util=%3.2f%%",
 599                                 dus->name,
 600                                 (unsigned long long) dus->s.ios[0],
 601                                 (unsigned long long) dus->s.ios[1],
 602                                 (unsigned long long) dus->s.merges[0],
 603                                 (unsigned long long) dus->s.merges[1],
 604                                 (unsigned long long) dus->s.ticks[0],
 605                                 (unsigned long long) dus->s.ticks[1],
 606                                 (unsigned long long) dus->s.time_in_queue,
 607                                 util);
 608         } else {
 609                 log_buf(out, ";%s;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
 610                                 dus->name,
 611                                 (unsigned long long) dus->s.ios[0],
 612                                 (unsigned long long) dus->s.ios[1],
 613                                 (unsigned long long) dus->s.merges[0],
 614                                 (unsigned long long) dus->s.merges[1],
 615                                 (unsigned long long) dus->s.ticks[0],
 616                                 (unsigned long long) dus->s.ticks[1],
 617                                 (unsigned long long) dus->s.time_in_queue,
 618                                 util);
 619         }
 620
 621         /*
 622          * If the device has slaves, aggregate the stats for
 623          * those slave devices also.
 624          */
 625         show_agg_stats(agg, terse, out);
 626
 627         if (!terse)
 628                 log_buf(out, "\n");
 629 }
 630
 631 void json_array_add_disk_util(struct disk_util_stat *dus,
 632                 struct disk_util_agg *agg, struct json_array *array)
 633 {
 634         struct json_object *obj;
 635         double util = 0;
 636
 637         if (dus->s.msec)
 638                 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
 639         if (util > 100.0)
 640                 util = 100.0;
 641
 642         obj = json_create_object();
 643         json_array_add_value_object(array, obj);
 644
 645         json_object_add_value_string(obj, "name", dus->name);
 646         json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
 647         json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
 648         json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
 649         json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
 650         json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
 651         json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
 652         json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
 653         json_object_add_value_float(obj, "util", util);
 654
 655         /*
 656          * If the device has slaves, aggregate the stats for
 657          * those slave devices also.
 658          */
 659         if (!agg->slavecount)
 660                 return;
 661         json_object_add_value_int(obj, "aggr_read_ios",
 662                                 agg->ios[0] / agg->slavecount);
 663         json_object_add_value_int(obj, "aggr_write_ios",
 664                                 agg->ios[1] / agg->slavecount);
 665         json_object_add_value_int(obj, "aggr_read_merges",
 666                                 agg->merges[0] / agg->slavecount);
 667         json_object_add_value_int(obj, "aggr_write_merge",
 668                                 agg->merges[1] / agg->slavecount);
 669         json_object_add_value_int(obj, "aggr_read_ticks",
 670                                 agg->ticks[0] / agg->slavecount);
 671         json_object_add_value_int(obj, "aggr_write_ticks",
 672                                 agg->ticks[1] / agg->slavecount);
 673         json_object_add_value_int(obj, "aggr_in_queue",
 674                                 agg->time_in_queue / agg->slavecount);
 675         json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
 676 }
 677
 678 static void json_object_add_disk_utils(struct json_object *obj,
 679                                        struct flist_head *head)
 680 {
 681         struct json_array *array = json_create_array();
 682         struct flist_head *entry;
 683         struct disk_util *du;
 684
 685         json_object_add_value_array(obj, "disk_util", array);
 686
 687         flist_for_each(entry, head) {
 688                 du = flist_entry(entry, struct disk_util, list);
 689
 690                 aggregate_slaves_stats(du);
 691                 json_array_add_disk_util(&du->dus, &du->agg, array);
 692         }
 693 }
 694
 695 void show_disk_util(int terse, struct json_object *parent,
 696                     struct buf_output *out)
 697 {
 698         struct flist_head *entry;
 699         struct disk_util *du;
 700         bool do_json;
 701
 702         if (!disk_util_sem)
 703                 return;
 704
 705         fio_sem_down(disk_util_sem);
 706
 707         if (flist_empty(&disk_list)) {
 708                 fio_sem_up(disk_util_sem);
 709                 return;
 710         }
 711
 712         if ((output_format & FIO_OUTPUT_JSON) && parent)
 713                 do_json = true;
 714         else
 715                 do_json = false;
 716
 717         if (!terse && !do_json)
 718                 log_buf(out, "\nDisk stats (read/write):\n");
 719
 720         if (do_json)
 721                 json_object_add_disk_utils(parent, &disk_list);
 722         else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
 723                 flist_for_each(entry, &disk_list) {
 724                         du = flist_entry(entry, struct disk_util, list);
 725
 726                         aggregate_slaves_stats(du);
 727                         print_disk_util(&du->dus, &du->agg, terse, out);
 728                 }
 729         }
 730
 731         fio_sem_up(disk_util_sem);
 732 }
 733
 734 void setup_disk_util(void)
 735 {
 736         disk_util_sem = fio_sem_init(FIO_SEM_UNLOCKED);
 737 }