14 static int last_majdev, last_mindev;
15 static struct disk_util *last_du;
17 FLIST_HEAD(disk_list);
19 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
20 int majdev, int mindev, char *path);
22 static void disk_util_free(struct disk_util *du)
27 while (!flist_empty(&du->slaves)) {
28 struct disk_util *slave;
30 slave = flist_entry(du->slaves.next, struct disk_util, slavelist);
31 flist_del(&slave->slavelist);
35 fio_mutex_remove(du->lock);
39 static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
42 unsigned long long sectors[2];
48 dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
50 f = fopen(du->path, "r");
54 p = fgets(line, sizeof(line), f);
60 dprint(FD_DISKUTIL, "%s: %s", du->path, p);
62 ret = sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0],
63 &dus->merges[0], §ors[0],
64 &dus->ticks[0], &dus->ios[1],
65 &dus->merges[1], §ors[1],
66 &dus->ticks[1], &in_flight,
67 &dus->io_ticks, &dus->time_in_queue);
69 dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
70 dus->sectors[0] = sectors[0];
71 dus->sectors[1] = sectors[1];
75 static void update_io_tick_disk(struct disk_util *du)
77 struct disk_util_stat __dus, *dus, *ldus;
82 if (get_io_ticks(du, &__dus))
88 dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
89 dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
90 dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
91 dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
92 dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
93 dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
94 dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
95 dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
96 dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
97 dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);
99 fio_gettime(&t, NULL);
100 dus->msec += mtime_since(&du->time, &t);
101 memcpy(&du->time, &t, sizeof(t));
102 memcpy(ldus, &__dus, sizeof(__dus));
105 void update_io_ticks(void)
107 struct flist_head *entry;
108 struct disk_util *du;
110 dprint(FD_DISKUTIL, "update io ticks\n");
112 flist_for_each(entry, &disk_list) {
113 du = flist_entry(entry, struct disk_util, list);
114 update_io_tick_disk(du);
118 static struct disk_util *disk_util_exists(int major, int minor)
120 struct flist_head *entry;
121 struct disk_util *du;
123 flist_for_each(entry, &disk_list) {
124 du = flist_entry(entry, struct disk_util, list);
126 if (major == du->major && minor == du->minor)
133 static int get_device_numbers(char *file_name, int *maj, int *min)
137 char tempname[PATH_MAX], *p;
139 if (!lstat(file_name, &st)) {
140 if (S_ISBLK(st.st_mode)) {
141 majdev = major(st.st_rdev);
142 mindev = minor(st.st_rdev);
143 } else if (S_ISCHR(st.st_mode)) {
144 majdev = major(st.st_rdev);
145 mindev = minor(st.st_rdev);
146 if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
148 } else if (S_ISFIFO(st.st_mode))
151 majdev = major(st.st_dev);
152 mindev = minor(st.st_dev);
156 * must be a file, open "." in that path
158 strncpy(tempname, file_name, PATH_MAX - 1);
159 p = dirname(tempname);
161 perror("disk util stat");
165 majdev = major(st.st_dev);
166 mindev = minor(st.st_dev);
175 static int read_block_dev_entry(char *path, int *maj, int *min)
180 f = fopen(path, "r");
186 p = fgets(line, sizeof(line), f);
192 if (sscanf(p, "%u:%u", maj, min) != 2)
198 static void find_add_disk_slaves(struct thread_data *td, char *path,
199 struct disk_util *masterdu)
201 DIR *dirhandle = NULL;
202 struct dirent *dirent = NULL;
203 char slavesdir[PATH_MAX], temppath[PATH_MAX], slavepath[PATH_MAX];
204 struct disk_util *slavedu = NULL;
208 sprintf(slavesdir, "%s/%s", path, "slaves");
209 dirhandle = opendir(slavesdir);
213 while ((dirent = readdir(dirhandle)) != NULL) {
214 if (!strcmp(dirent->d_name, ".") ||
215 !strcmp(dirent->d_name, ".."))
218 sprintf(temppath, "%s/%s", slavesdir, dirent->d_name);
219 /* Can we always assume that the slaves device entries
220 * are links to the real directories for the slave
223 linklen = readlink(temppath, slavepath, PATH_MAX - 0);
225 perror("readlink() for slave device.");
228 slavepath[linklen] = '\0';
230 sprintf(temppath, "%s/%s/dev", slavesdir, slavepath);
231 if (read_block_dev_entry(temppath, &majdev, &mindev)) {
232 perror("Error getting slave device numbers.");
237 * See if this maj,min already exists
239 slavedu = disk_util_exists(majdev, mindev);
243 sprintf(temppath, "%s/%s", slavesdir, slavepath);
244 __init_per_file_disk_util(td, majdev, mindev, temppath);
245 slavedu = disk_util_exists(majdev, mindev);
247 /* Should probably use an assert here. slavedu should
248 * always be present at this point. */
251 flist_add_tail(&slavedu->slavelist, &masterdu->slaves);
258 static struct disk_util *disk_util_add(struct thread_data *td, int majdev,
259 int mindev, char *path)
261 struct disk_util *du, *__du;
262 struct flist_head *entry;
264 dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
266 du = smalloc(sizeof(*du));
267 memset(du, 0, sizeof(*du));
268 INIT_FLIST_HEAD(&du->list);
269 sprintf(du->path, "%s/stat", path);
270 strncpy((char *) du->dus.name, basename(path), FIO_DU_NAME_SZ);
271 du->sysfs_root = path;
274 INIT_FLIST_HEAD(&du->slavelist);
275 INIT_FLIST_HEAD(&du->slaves);
276 du->lock = fio_mutex_init(1);
279 flist_for_each(entry, &disk_list) {
280 __du = flist_entry(entry, struct disk_util, list);
282 dprint(FD_DISKUTIL, "found %s in list\n", __du->dus.name);
284 if (!strcmp((char *) du->dus.name, (char *) __du->dus.name)) {
290 dprint(FD_DISKUTIL, "add %s to list\n", du->dus.name);
292 fio_gettime(&du->time, NULL);
293 get_io_ticks(du, &du->last_dus);
295 flist_add_tail(&du->list, &disk_list);
296 find_add_disk_slaves(td, path, du);
300 static int check_dev_match(int majdev, int mindev, char *path)
304 if (read_block_dev_entry(path, &major, &minor))
307 if (majdev == major && mindev == minor)
313 static int find_block_dir(int majdev, int mindev, char *path, int link_ok)
324 while ((dir = readdir(D)) != NULL) {
327 if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
330 sprintf(full_path, "%s/%s", path, dir->d_name);
332 if (!strcmp(dir->d_name, "dev")) {
333 if (!check_dev_match(majdev, mindev, full_path)) {
340 if (stat(full_path, &st) == -1) {
345 if (lstat(full_path, &st) == -1) {
351 if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
354 found = find_block_dir(majdev, mindev, full_path, 0);
356 strcpy(path, full_path);
365 static struct disk_util *__init_per_file_disk_util(struct thread_data *td,
366 int majdev, int mindev,
374 * If there's a ../queue/ directory there, we are inside a partition.
375 * Check if that is the case and jump back. For loop/md/dm etc we
376 * are already in the right spot.
378 sprintf(tmp, "%s/../queue", path);
379 if (!stat(tmp, &st)) {
381 sprintf(tmp, "%s/queue", p);
382 if (stat(tmp, &st)) {
383 log_err("unknown sysfs layout\n");
386 strncpy(tmp, p, PATH_MAX - 1);
387 sprintf(path, "%s", tmp);
390 if (td->o.ioscheduler && !td->sysfs_root)
391 td->sysfs_root = strdup(path);
393 return disk_util_add(td, majdev, mindev, path);
396 static struct disk_util *init_per_file_disk_util(struct thread_data *td,
401 struct disk_util *du;
404 if (get_device_numbers(filename, &majdev, &mindev))
407 dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", filename, majdev,
410 du = disk_util_exists(majdev, mindev);
412 if (td->o.ioscheduler && !td->sysfs_root)
413 td->sysfs_root = strdup(du->sysfs_root);
419 * for an fs without a device, we will repeatedly stat through
420 * sysfs which can take oodles of time for thousands of files. so
421 * cache the last lookup and compare with that before going through
424 if (mindev == last_mindev && majdev == last_majdev)
427 last_mindev = mindev;
428 last_majdev = majdev;
430 sprintf(foo, "/sys/block");
431 if (!find_block_dir(majdev, mindev, foo, 1))
434 return __init_per_file_disk_util(td, majdev, mindev, foo);
437 static struct disk_util *__init_disk_util(struct thread_data *td,
440 return init_per_file_disk_util(td, f->file_name);
443 void init_disk_util(struct thread_data *td)
448 if (!td->o.do_disk_util ||
449 (td->io_ops->flags & (FIO_DISKLESSIO | FIO_NODISKUTIL)))
452 for_each_file(td, f, i)
453 f->du = __init_disk_util(td, f);
456 static void show_agg_stats(struct disk_util_agg *agg, int terse)
458 if (!agg->slavecount)
462 log_info(", aggrios=%u/%u, aggrmerge=%u/%u, aggrticks=%u/%u,"
463 " aggrin_queue=%u, aggrutil=%3.2f%%",
464 agg->ios[0] / agg->slavecount,
465 agg->ios[1] / agg->slavecount,
466 agg->merges[0] / agg->slavecount,
467 agg->merges[1] / agg->slavecount,
468 agg->ticks[0] / agg->slavecount,
469 agg->ticks[1] / agg->slavecount,
470 agg->time_in_queue / agg->slavecount,
473 log_info("slaves;%u;%u;%u;%u;%u;%u;%u;%3.2f%%",
474 agg->ios[0] / agg->slavecount,
475 agg->ios[1] / agg->slavecount,
476 agg->merges[0] / agg->slavecount,
477 agg->merges[1] / agg->slavecount,
478 agg->ticks[0] / agg->slavecount,
479 agg->ticks[1] / agg->slavecount,
480 agg->time_in_queue / agg->slavecount,
485 static void aggregate_slaves_stats(struct disk_util *masterdu)
487 struct disk_util_agg *agg = &masterdu->agg;
488 struct disk_util_stat *dus;
489 struct flist_head *entry;
490 struct disk_util *slavedu;
493 flist_for_each(entry, &masterdu->slaves) {
494 slavedu = flist_entry(entry, struct disk_util, slavelist);
496 agg->ios[0] += dus->ios[0];
497 agg->ios[1] += dus->ios[1];
498 agg->merges[0] += dus->merges[0];
499 agg->merges[1] += dus->merges[1];
500 agg->sectors[0] += dus->sectors[0];
501 agg->sectors[1] += dus->sectors[1];
502 agg->ticks[0] += dus->ticks[0];
503 agg->ticks[1] += dus->ticks[1];
504 agg->time_in_queue += dus->time_in_queue;
507 util = (double) (100 * dus->io_ticks / (double) slavedu->dus.msec);
508 /* System utilization is the utilization of the
509 * component with the highest utilization.
511 if (util > agg->max_util.u.f)
512 agg->max_util.u.f = util;
516 if (agg->max_util.u.f > 100.0)
517 agg->max_util.u.f = 100.0;
520 void free_disk_util(void)
522 struct disk_util *du;
524 while (!flist_empty(&disk_list)) {
525 du = flist_entry(disk_list.next, struct disk_util, list);
526 flist_del(&du->list);
530 last_majdev = last_mindev = -1;
533 void print_disk_util(struct disk_util_stat *dus, struct disk_util_agg *agg,
539 util = (double) 100 * dus->io_ticks / (double) dus->msec;
547 log_info(" %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, "
548 "in_queue=%u, util=%3.2f%%", dus->name,
549 dus->ios[0], dus->ios[1],
550 dus->merges[0], dus->merges[1],
551 dus->ticks[0], dus->ticks[1],
552 dus->time_in_queue, util);
554 log_info(";%s;%u;%u;%u;%u;%u;%u;%u;%3.2f%%",
555 dus->name, dus->ios[0], dus->ios[1],
556 dus->merges[0], dus->merges[1],
557 dus->ticks[0], dus->ticks[1],
558 dus->time_in_queue, util);
562 * If the device has slaves, aggregate the stats for
563 * those slave devices also.
566 show_agg_stats(agg, terse);
572 void show_disk_util(int terse)
574 struct flist_head *entry;
575 struct disk_util *du;
577 if (flist_empty(&disk_list))
581 log_info("\nDisk stats (read/write):\n");
583 flist_for_each(entry, &disk_list) {
584 du = flist_entry(entry, struct disk_util, list);
586 aggregate_slaves_stats(du);
587 print_disk_util(&du->dus, &du->agg, terse);