14 #include "helper_thread.h"
16 static int last_majdev, last_mindev;
17 static struct disk_util *last_du;
19 static struct fio_mutex *disk_util_mutex;
21 FLIST_HEAD(disk_list);
23 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
24 int majdev, int mindev, char *path);
26 static void disk_util_free(struct disk_util *du)
31 while (!flist_empty(&du->slaves)) {
32 struct disk_util *slave;
34 slave = flist_first_entry(&du->slaves, struct disk_util, slavelist);
35 flist_del(&slave->slavelist);
39 fio_mutex_remove(du->lock);
43 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
46 unsigned long long sectors[2];
52 dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
54 f = fopen(du->path, "r");
58 p = fgets(line, sizeof(line), f);
64 dprint(FD_DISKUTIL, "%s: %s", du->path, p);
66 ret = sscanf(p, "%llu %llu %llu %llu %llu %llu %llu %llu %u %llu %llu\n",
67 (unsigned long long *) &dus->s.ios[0],
68 (unsigned long long *) &dus->s.merges[0],
70 (unsigned long long *) &dus->s.ticks[0],
71 (unsigned long long *) &dus->s.ios[1],
72 (unsigned long long *) &dus->s.merges[1],
74 (unsigned long long *) &dus->s.ticks[1],
76 (unsigned long long *) &dus->s.io_ticks,
77 (unsigned long long *) &dus->s.time_in_queue);
79 dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
80 dus->s.sectors[0] = sectors[0];
81 dus->s.sectors[1] = sectors[1];
85 static void update_io_tick_disk(struct disk_util *du)
87 struct disk_util_stat __dus, *dus, *ldus;
92 if (get_io_ticks(du, &__dus))
98 dus->s.sectors[0] += (__dus.s.sectors[0] - ldus->s.sectors[0]);
99 dus->s.sectors[1] += (__dus.s.sectors[1] - ldus->s.sectors[1]);
100 dus->s.ios[0] += (__dus.s.ios[0] - ldus->s.ios[0]);
101 dus->s.ios[1] += (__dus.s.ios[1] - ldus->s.ios[1]);
102 dus->s.merges[0] += (__dus.s.merges[0] - ldus->s.merges[0]);
103 dus->s.merges[1] += (__dus.s.merges[1] - ldus->s.merges[1]);
104 dus->s.ticks[0] += (__dus.s.ticks[0] - ldus->s.ticks[0]);
105 dus->s.ticks[1] += (__dus.s.ticks[1] - ldus->s.ticks[1]);
106 dus->s.io_ticks += (__dus.s.io_ticks - ldus->s.io_ticks);
107 dus->s.time_in_queue += (__dus.s.time_in_queue - ldus->s.time_in_queue);
109 fio_gettime(&t, NULL);
110 dus->s.msec += mtime_since(&du->time, &t);
111 memcpy(&du->time, &t, sizeof(t));
112 memcpy(&ldus->s, &__dus.s, sizeof(__dus.s));
115 int update_io_ticks(void)
117 struct flist_head *entry;
118 struct disk_util *du;
121 dprint(FD_DISKUTIL, "update io ticks\n");
123 fio_mutex_down(disk_util_mutex);
125 if (!helper_should_exit()) {
126 flist_for_each(entry, &disk_list) {
127 du = flist_entry(entry, struct disk_util, list);
128 update_io_tick_disk(du);
133 fio_mutex_up(disk_util_mutex);
137 static struct disk_util *disk_util_exists(int major, int minor)
139 struct flist_head *entry;
140 struct disk_util *du;
142 fio_mutex_down(disk_util_mutex);
144 flist_for_each(entry, &disk_list) {
145 du = flist_entry(entry, struct disk_util, list);
147 if (major == du->major && minor == du->minor) {
148 fio_mutex_up(disk_util_mutex);
153 fio_mutex_up(disk_util_mutex);
157 static int get_device_numbers(char *file_name, int *maj, int *min)
161 char tempname[PATH_MAX], *p;
163 if (!lstat(file_name, &st)) {
164 if (S_ISBLK(st.st_mode)) {
165 majdev = major(st.st_rdev);
166 mindev = minor(st.st_rdev);
167 } else if (S_ISCHR(st.st_mode)) {
168 majdev = major(st.st_rdev);
169 mindev = minor(st.st_rdev);
170 if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
172 } else if (S_ISFIFO(st.st_mode))
175 majdev = major(st.st_dev);
176 mindev = minor(st.st_dev);
180 * must be a file, open "." in that path
182 tempname[PATH_MAX - 1] = '\0';
183 strncpy(tempname, file_name, PATH_MAX - 1);
184 p = dirname(tempname);
186 perror("disk util stat");
190 majdev = major(st.st_dev);
191 mindev = minor(st.st_dev);
200 static int read_block_dev_entry(char *path, int *maj, int *min)
205 f = fopen(path, "r");
211 p = fgets(line, sizeof(line), f);
217 if (sscanf(p, "%u:%u", maj, min) != 2)
223 static void find_add_disk_slaves(struct thread_data *td, char *path,
224 struct disk_util *masterdu)
226 DIR *dirhandle = NULL;
227 struct dirent *dirent = NULL;
228 char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
229 struct disk_util *slavedu = NULL;
233 sprintf(slavesdir, "%s/%s", path, "slaves");
234 dirhandle = opendir(slavesdir);
238 while ((dirent = readdir(dirhandle)) != NULL) {
239 if (!strcmp(dirent->d_name, ".") ||
240 !strcmp(dirent->d_name, ".."))
243 sprintf(temppath, "%s/%s", slavesdir, dirent->d_name);
244 /* Can we always assume that the slaves device entries
245 * are links to the real directories for the slave
248 linklen = readlink(temppath, slavepath, PATH_MAX - 1);
250 perror("readlink() for slave device.");
254 slavepath[linklen] = '\0';
256 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
257 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
258 perror("Error getting slave device numbers.");
264 * See if this maj,min already exists
266 slavedu = disk_util_exists(majdev, mindev);
270 sprintf(temppath, "%s/%s", slavesdir, slavepath);
271 __init_per_file_disk_util(td, majdev, mindev, temppath);
272 slavedu = disk_util_exists(majdev, mindev);
274 /* Should probably use an assert here. slavedu should
275 * always be present at this point. */
278 flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
285 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
286 int mindev, char *path)
288 struct disk_util *du, *__du;
289 struct flist_head *entry;
292 dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
294 du = smalloc(sizeof(*du));
298 memset(du, 0, sizeof(*du));
299 INIT_FLIST_HEAD(&du->list);
300 l = snprintf(du->path, sizeof(du->path), "%s/stat", path);
301 if (l < 0 || l >= sizeof(du->path)) {
302 log_err("constructed path \"%.100s[...]/stat\" larger than buffer (%zu bytes)\n",
303 path, sizeof(du->path) - 1);
307 strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ - 1);
308 du->sysfs_root = path;
311 INIT_FLIST_HEAD(&du->slavelist);
312 INIT_FLIST_HEAD(&du->slaves);
313 du->lock = fio_mutex_init(FIO_MUTEX_UNLOCKED);
316 fio_mutex_down(disk_util_mutex);
318 flist_for_each(entry, &disk_list) {
319 __du = flist_entry(entry, struct disk_util, list);
321 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
323 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
325 fio_mutex_up(disk_util_mutex);
330 dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
332 fio_gettime(&du->time, NULL);
333 get_io_ticks(du, &du->last_dus);
335 flist_add_tail(&du->list, &disk_list);
336 fio_mutex_up(disk_util_mutex);
338 find_add_disk_slaves(td, path, du);
342 static int check_dev_match(int majdev, int mindev, char *path)
346 if (read_block_dev_entry(path, &major, &minor))
349 if (majdev == major && mindev == minor)
355 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
366 while ((dir = readdir(D)) != NULL) {
369 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
372 sprintf(full_path, "%s/%s", path, dir->d_name);
374 if (!strcmp(dir->d_name, "dev")) {
375 if (!check_dev_match(majdev, mindev, full_path)) {
382 if (stat(full_path, &st) == -1) {
387 if (lstat(full_path, &st) == -1) {
393 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
396 found = find_block_dir(majdev, mindev, full_path, 0);
398 strcpy(path, full_path);
407 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
408 int majdev, int mindev,
416 * If there's a ../queue/ directory there, we are inside a partition.
417 * Check if that is the case and jump back. For loop/md/dm etc we
418 * are already in the right spot.
420 sprintf(tmp, "%s/../queue", path);
421 if (!stat(tmp, &st)) {
423 sprintf(tmp, "%s/queue", p);
424 if (stat(tmp, &st)) {
425 log_err("unknown sysfs layout\n");
428 tmp[PATH_MAX - 1] = '\0';
429 strncpy(tmp, p, PATH_MAX - 1);
430 sprintf(path, "%s", tmp);
433 if (td->o.ioscheduler && !td->sysfs_root)
434 td->sysfs_root = strdup(path);
436 return disk_util_add(td, majdev, mindev, path);
439 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
444 struct disk_util *du;
447 if (get_device_numbers(filename, &majdev, &mindev))
450 dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
453 du = disk_util_exists(majdev, mindev);
455 if (td->o.ioscheduler && !td->sysfs_root)
456 td->sysfs_root = strdup(du->sysfs_root);
462 * for an fs without a device, we will repeatedly stat through
463 * sysfs which can take oodles of time for thousands of files. so
464 * cache the last lookup and compare with that before going through
467 if (mindev == last_mindev && majdev == last_majdev)
470 last_mindev = mindev;
471 last_majdev = majdev;
473 sprintf(foo, "/sys/block");
474 if (!find_block_dir(majdev, mindev, foo, 1))
477 return __init_per_file_disk_util(td, majdev, mindev, foo);
480 static struct disk_util *__init_disk_util(struct thread_data *td,
483 return init_per_file_disk_util(td, f->file_name);
486 void init_disk_util(struct thread_data *td)
491 if (!td->o.do_disk_util ||
492 td_ioengine_flagged(td, FIO_DISKLESSIO | FIO_NODISKUTIL))
495 for_each_file(td, f, i)
496 f->du = __init_disk_util(td, f);
499 static void show_agg_stats(struct disk_util_agg *agg, int terse,
500 struct buf_output *out)
502 if (!agg->slavecount)
506 log_buf(out, ", aggrios=%llu/%llu, aggrmerge=%llu/%llu, "
507 "aggrticks=%llu/%llu, aggrin_queue=%llu, "
509 (unsigned long long) agg->ios[0] / agg->slavecount,
510 (unsigned long long) agg->ios[1] / agg->slavecount,
511 (unsigned long long) agg->merges[0] / agg->slavecount,
512 (unsigned long long) agg->merges[1] / agg->slavecount,
513 (unsigned long long) agg->ticks[0] / agg->slavecount,
514 (unsigned long long) agg->ticks[1] / agg->slavecount,
515 (unsigned long long) agg->time_in_queue / agg->slavecount,
518 log_buf(out, ";slaves;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
519 (unsigned long long) agg->ios[0] / agg->slavecount,
520 (unsigned long long) agg->ios[1] / agg->slavecount,
521 (unsigned long long) agg->merges[0] / agg->slavecount,
522 (unsigned long long) agg->merges[1] / agg->slavecount,
523 (unsigned long long) agg->ticks[0] / agg->slavecount,
524 (unsigned long long) agg->ticks[1] / agg->slavecount,
525 (unsigned long long) agg->time_in_queue / agg->slavecount,
530 static void aggregate_slaves_stats(struct disk_util *masterdu)
532 struct disk_util_agg *agg = &masterdu->agg;
533 struct disk_util_stat *dus;
534 struct flist_head *entry;
535 struct disk_util *slavedu;
538 flist_for_each(entry, &masterdu->slaves) {
539 slavedu = flist_entry(entry, struct disk_util, slavelist);
541 agg->ios[0] += dus->s.ios[0];
542 agg->ios[1] += dus->s.ios[1];
543 agg->merges[0] += dus->s.merges[0];
544 agg->merges[1] += dus->s.merges[1];
545 agg->sectors[0] += dus->s.sectors[0];
546 agg->sectors[1] += dus->s.sectors[1];
547 agg->ticks[0] += dus->s.ticks[0];
548 agg->ticks[1] += dus->s.ticks[1];
549 agg->time_in_queue += dus->s.time_in_queue;
552 util = (double) (100 * dus->s.io_ticks / (double) slavedu->dus.s.msec);
553 /* System utilization is the utilization of the
554 * component with the highest utilization.
556 if (util > agg->max_util.u.f)
557 agg->max_util.u.f = util;
561 if (agg->max_util.u.f > 100.0)
562 agg->max_util.u.f = 100.0;
565 void disk_util_prune_entries(void)
567 fio_mutex_down(disk_util_mutex);
569 while (!flist_empty(&disk_list)) {
570 struct disk_util *du;
572 du = flist_first_entry(&disk_list, struct disk_util, list);
573 flist_del(&du->list);
577 last_majdev = last_mindev = -1;
578 fio_mutex_up(disk_util_mutex);
579 fio_mutex_remove(disk_util_mutex);
582 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
583 int terse, struct buf_output *out)
588 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
596 log_buf(out, " %s: ios=%llu/%llu, merge=%llu/%llu, "
597 "ticks=%llu/%llu, in_queue=%llu, util=%3.2f%%",
599 (unsigned long long) dus->s.ios[0],
600 (unsigned long long) dus->s.ios[1],
601 (unsigned long long) dus->s.merges[0],
602 (unsigned long long) dus->s.merges[1],
603 (unsigned long long) dus->s.ticks[0],
604 (unsigned long long) dus->s.ticks[1],
605 (unsigned long long) dus->s.time_in_queue,
608 log_buf(out, ";%s;%llu;%llu;%llu;%llu;%llu;%llu;%llu;%3.2f%%",
610 (unsigned long long) dus->s.ios[0],
611 (unsigned long long) dus->s.ios[1],
612 (unsigned long long) dus->s.merges[0],
613 (unsigned long long) dus->s.merges[1],
614 (unsigned long long) dus->s.ticks[0],
615 (unsigned long long) dus->s.ticks[1],
616 (unsigned long long) dus->s.time_in_queue,
621 * If the device has slaves, aggregate the stats for
622 * those slave devices also.
624 show_agg_stats(agg, terse, out);
630 void json_array_add_disk_util(struct disk_util_stat *dus,
631 struct disk_util_agg *agg, struct json_array *array)
633 struct json_object *obj;
637 util = (double) 100 * dus->s.io_ticks / (double) dus->s.msec;
641 obj = json_create_object();
642 json_array_add_value_object(array, obj);
644 json_object_add_value_string(obj, "name", dus->name);
645 json_object_add_value_int(obj, "read_ios", dus->s.ios[0]);
646 json_object_add_value_int(obj, "write_ios", dus->s.ios[1]);
647 json_object_add_value_int(obj, "read_merges", dus->s.merges[0]);
648 json_object_add_value_int(obj, "write_merges", dus->s.merges[1]);
649 json_object_add_value_int(obj, "read_ticks", dus->s.ticks[0]);
650 json_object_add_value_int(obj, "write_ticks", dus->s.ticks[1]);
651 json_object_add_value_int(obj, "in_queue", dus->s.time_in_queue);
652 json_object_add_value_float(obj, "util", util);
655 * If the device has slaves, aggregate the stats for
656 * those slave devices also.
658 if (!agg->slavecount)
660 json_object_add_value_int(obj, "aggr_read_ios",
661 agg->ios[0] / agg->slavecount);
662 json_object_add_value_int(obj, "aggr_write_ios",
663 agg->ios[1] / agg->slavecount);
664 json_object_add_value_int(obj, "aggr_read_merges",
665 agg->merges[0] / agg->slavecount);
666 json_object_add_value_int(obj, "aggr_write_merge",
667 agg->merges[1] / agg->slavecount);
668 json_object_add_value_int(obj, "aggr_read_ticks",
669 agg->ticks[0] / agg->slavecount);
670 json_object_add_value_int(obj, "aggr_write_ticks",
671 agg->ticks[1] / agg->slavecount);
672 json_object_add_value_int(obj, "aggr_in_queue",
673 agg->time_in_queue / agg->slavecount);
674 json_object_add_value_float(obj, "aggr_util", agg->max_util.u.f);
677 static void json_object_add_disk_utils(struct json_object *obj,
678 struct flist_head *head)
680 struct json_array *array = json_create_array();
681 struct flist_head *entry;
682 struct disk_util *du;
684 json_object_add_value_array(obj, "disk_util", array);
686 flist_for_each(entry, head) {
687 du = flist_entry(entry, struct disk_util, list);
689 aggregate_slaves_stats(du);
690 json_array_add_disk_util(&du->dus, &du->agg, array);
694 void show_disk_util(int terse, struct json_object *parent,
695 struct buf_output *out)
697 struct flist_head *entry;
698 struct disk_util *du;
701 if (!disk_util_mutex)
704 fio_mutex_down(disk_util_mutex);
706 if (flist_empty(&disk_list)) {
707 fio_mutex_up(disk_util_mutex);
711 if ((output_format & FIO_OUTPUT_JSON) && parent)
716 if (!terse && !do_json)
717 log_buf(out, "\nDisk stats (read/write):\n");
720 json_object_add_disk_utils(parent, &disk_list);
721 else if (output_format & ~(FIO_OUTPUT_JSON | FIO_OUTPUT_JSON_PLUS)) {
722 flist_for_each(entry, &disk_list) {
723 du = flist_entry(entry, struct disk_util, list);
725 aggregate_slaves_stats(du);
726 print_disk_util(&du->dus, &du->agg, terse, out);
730 fio_mutex_up(disk_util_mutex);
733 void setup_disk_util(void)
735 disk_util_mutex = fio_mutex_init(FIO_MUTEX_UNLOCKED);