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