blob: a38f4fa3f73970a798cc4a2ed838b232256a5490 [file] [log] [blame]
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>
#include <libgen.h>
#include <math.h>
#include "fio.h"
static int last_majdev, last_mindev;
static struct flist_head disk_list = FLIST_HEAD_INIT(disk_list);
static int get_io_ticks(struct disk_util *du, struct disk_util_stat *dus)
{
unsigned in_flight;
char line[256];
FILE *f;
char *p;
int ret;
dprint(FD_DISKUTIL, "open stat file: %s\n", du->path);
f = fopen(du->path, "r");
if (!f)
return 1;
p = fgets(line, sizeof(line), f);
if (!p) {
fclose(f);
return 1;
}
dprint(FD_DISKUTIL, "%s: %s", du->path, p);
ret = sscanf(p, "%u %u %llu %u %u %u %llu %u %u %u %u\n", &dus->ios[0],
&dus->merges[0], &dus->sectors[0],
&dus->ticks[0], &dus->ios[1],
&dus->merges[1], &dus->sectors[1],
&dus->ticks[1], &in_flight,
&dus->io_ticks, &dus->time_in_queue);
fclose(f);
dprint(FD_DISKUTIL, "%s: stat read ok? %d\n", du->path, ret == 1);
return ret != 11;
}
static void update_io_tick_disk(struct disk_util *du)
{
struct disk_util_stat __dus, *dus, *ldus;
struct timeval t;
if (get_io_ticks(du, &__dus))
return;
dus = &du->dus;
ldus = &du->last_dus;
dus->sectors[0] += (__dus.sectors[0] - ldus->sectors[0]);
dus->sectors[1] += (__dus.sectors[1] - ldus->sectors[1]);
dus->ios[0] += (__dus.ios[0] - ldus->ios[0]);
dus->ios[1] += (__dus.ios[1] - ldus->ios[1]);
dus->merges[0] += (__dus.merges[0] - ldus->merges[0]);
dus->merges[1] += (__dus.merges[1] - ldus->merges[1]);
dus->ticks[0] += (__dus.ticks[0] - ldus->ticks[0]);
dus->ticks[1] += (__dus.ticks[1] - ldus->ticks[1]);
dus->io_ticks += (__dus.io_ticks - ldus->io_ticks);
dus->time_in_queue += (__dus.time_in_queue - ldus->time_in_queue);
fio_gettime(&t, NULL);
du->msec += mtime_since(&du->time, &t);
memcpy(&du->time, &t, sizeof(t));
memcpy(ldus, &__dus, sizeof(__dus));
}
void update_io_ticks(void)
{
struct flist_head *entry;
struct disk_util *du;
dprint(FD_DISKUTIL, "update io ticks\n");
flist_for_each(entry, &disk_list) {
du = flist_entry(entry, struct disk_util, list);
update_io_tick_disk(du);
}
}
static struct disk_util *disk_util_exists(int major, int minor)
{
struct flist_head *entry;
struct disk_util *du;
flist_for_each(entry, &disk_list) {
du = flist_entry(entry, struct disk_util, list);
if (major == du->major && minor == du->minor)
return du;
}
return NULL;
}
static void disk_util_add(int majdev, int mindev, char *path)
{
struct disk_util *du, *__du;
struct flist_head *entry;
dprint(FD_DISKUTIL, "add maj/min %d/%d: %s\n", majdev, mindev, path);
du = malloc(sizeof(*du));
memset(du, 0, sizeof(*du));
INIT_FLIST_HEAD(&du->list);
sprintf(du->path, "%s/stat", path);
du->name = strdup(basename(path));
du->sysfs_root = path;
du->major = majdev;
du->minor = mindev;
flist_for_each(entry, &disk_list) {
__du = flist_entry(entry, struct disk_util, list);
dprint(FD_DISKUTIL, "found %s in list\n", __du->name);
if (!strcmp(du->name, __du->name)) {
free(du->name);
free(du);
return;
}
}
dprint(FD_DISKUTIL, "add %s to list\n", du->name);
fio_gettime(&du->time, NULL);
get_io_ticks(du, &du->last_dus);
flist_add_tail(&du->list, &disk_list);
}
static int check_dev_match(int majdev, int mindev, char *path)
{
int major, minor;
char line[256], *p;
FILE *f;
f = fopen(path, "r");
if (!f) {
perror("open path");
return 1;
}
p = fgets(line, sizeof(line), f);
if (!p) {
fclose(f);
return 1;
}
if (sscanf(p, "%u:%u", &major, &minor) != 2) {
fclose(f);
return 1;
}
if (majdev == major && mindev == minor) {
fclose(f);
return 0;
}
fclose(f);
return 1;
}
static int find_block_dir(int majdev, int mindev, char *path)
{
struct dirent *dir;
struct stat st;
int found = 0;
DIR *D;
D = opendir(path);
if (!D)
return 0;
while ((dir = readdir(D)) != NULL) {
char full_path[256];
if (!strcmp(dir->d_name, ".") || !strcmp(dir->d_name, ".."))
continue;
sprintf(full_path, "%s/%s", path, dir->d_name);
if (!strcmp(dir->d_name, "dev")) {
if (!check_dev_match(majdev, mindev, full_path)) {
found = 1;
break;
}
}
if (lstat(full_path, &st) == -1) {
perror("stat");
break;
}
if (!S_ISDIR(st.st_mode) || S_ISLNK(st.st_mode))
continue;
found = find_block_dir(majdev, mindev, full_path);
if (found) {
strcpy(path, full_path);
break;
}
}
closedir(D);
return found;
}
static void __init_disk_util(struct thread_data *td, struct fio_file *f)
{
struct stat st;
char foo[PATH_MAX], tmp[PATH_MAX];
struct disk_util *du;
int mindev, majdev;
char *p;
if (!lstat(f->file_name, &st)) {
if (S_ISBLK(st.st_mode)) {
majdev = major(st.st_rdev);
mindev = minor(st.st_rdev);
} else if (S_ISCHR(st.st_mode)) {
majdev = major(st.st_rdev);
mindev = minor(st.st_rdev);
if (fio_lookup_raw(st.st_rdev, &majdev, &mindev))
return;
} else if (S_ISFIFO(st.st_mode))
return;
else {
majdev = major(st.st_dev);
mindev = minor(st.st_dev);
}
} else {
/*
* must be a file, open "." in that path
*/
strncpy(foo, f->file_name, PATH_MAX - 1);
p = dirname(foo);
if (stat(p, &st)) {
perror("disk util stat");
return;
}
majdev = major(st.st_dev);
mindev = minor(st.st_dev);
}
dprint(FD_DISKUTIL, "%s belongs to maj/min %d/%d\n", f->file_name,
majdev, mindev);
du = disk_util_exists(majdev, mindev);
if (du) {
if (td->o.ioscheduler && !td->sysfs_root)
td->sysfs_root = strdup(du->sysfs_root);
return;
}
/*
* for an fs without a device, we will repeatedly stat through
* sysfs which can take oodles of time for thousands of files. so
* cache the last lookup and compare with that before going through
* everything again.
*/
if (mindev == last_mindev && majdev == last_majdev)
return;
last_mindev = mindev;
last_majdev = majdev;
sprintf(foo, "/sys/block");
if (!find_block_dir(majdev, mindev, foo))
return;
/*
* If there's a ../queue/ directory there, we are inside a partition.
* Check if that is the case and jump back. For loop/md/dm etc we
* are already in the right spot.
*/
sprintf(tmp, "%s/../queue", foo);
if (!stat(tmp, &st)) {
p = dirname(foo);
sprintf(tmp, "%s/queue", p);
if (stat(tmp, &st)) {
log_err("unknown sysfs layout\n");
return;
}
strncpy(tmp, p, PATH_MAX - 1);
sprintf(foo, "%s", tmp);
}
if (td->o.ioscheduler && !td->sysfs_root)
td->sysfs_root = strdup(foo);
disk_util_add(majdev, mindev, foo);
}
void init_disk_util(struct thread_data *td)
{
struct fio_file *f;
unsigned int i;
if (!td->o.do_disk_util ||
(td->io_ops->flags & (FIO_DISKLESSIO | FIO_NODISKUTIL)))
return;
for_each_file(td, f, i)
__init_disk_util(td, f);
}
void show_disk_util(void)
{
struct disk_util_stat *dus;
struct flist_head *entry, *next;
struct disk_util *du;
double util;
if (flist_empty(&disk_list))
return;
log_info("\nDisk stats (read/write):\n");
flist_for_each(entry, &disk_list) {
du = flist_entry(entry, struct disk_util, list);
dus = &du->dus;
util = (double) 100 * du->dus.io_ticks / (double) du->msec;
if (util > 100.0)
util = 100.0;
log_info(" %s: ios=%u/%u, merge=%u/%u, ticks=%u/%u, "
"in_queue=%u, util=%3.2f%%\n", du->name,
dus->ios[0], dus->ios[1],
dus->merges[0], dus->merges[1],
dus->ticks[0], dus->ticks[1],
dus->time_in_queue, util);
}
/*
* now free the list
*/
flist_for_each_safe(entry, next, &disk_list) {
flist_del(entry);
du = flist_entry(entry, struct disk_util, list);
free(du->name);
free(du);
}
}