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proc_diskstats.c
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proc_diskstats.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#include "plugin_proc.h"
#define RRD_TYPE_DISK "disk"
#define PLUGIN_PROC_MODULE_DISKSTATS_NAME "/proc/diskstats"
#define CONFIG_SECTION_PLUGIN_PROC_DISKSTATS "plugin:" PLUGIN_PROC_CONFIG_NAME ":" PLUGIN_PROC_MODULE_DISKSTATS_NAME
#define DISK_TYPE_UNKNOWN 0
#define DISK_TYPE_PHYSICAL 1
#define DISK_TYPE_PARTITION 2
#define DISK_TYPE_VIRTUAL 3
#define DEFAULT_EXCLUDED_DISKS "loop* ram*"
static struct disk {
char *disk; // the name of the disk (sda, sdb, etc, after being looked up)
char *device; // the device of the disk (before being looked up)
unsigned long major;
unsigned long minor;
int sector_size;
int type;
char *mount_point;
// disk options caching
int do_io;
int do_ops;
int do_mops;
int do_iotime;
int do_qops;
int do_util;
int do_backlog;
int do_bcache;
int updated;
int device_is_bcache;
char *bcache_filename_dirty_data;
char *bcache_filename_writeback_rate;
char *bcache_filename_cache_congested;
char *bcache_filename_cache_available_percent;
char *bcache_filename_stats_five_minute_cache_hit_ratio;
char *bcache_filename_stats_hour_cache_hit_ratio;
char *bcache_filename_stats_day_cache_hit_ratio;
char *bcache_filename_stats_total_cache_hit_ratio;
char *bcache_filename_stats_total_cache_hits;
char *bcache_filename_stats_total_cache_misses;
char *bcache_filename_stats_total_cache_miss_collisions;
char *bcache_filename_stats_total_cache_bypass_hits;
char *bcache_filename_stats_total_cache_bypass_misses;
char *bcache_filename_stats_total_cache_readaheads;
char *bcache_filename_cache_read_races;
char *bcache_filename_cache_io_errors;
char *bcache_filename_priority_stats;
usec_t bcache_priority_stats_update_every_usec;
usec_t bcache_priority_stats_elapsed_usec;
RRDSET *st_io;
RRDDIM *rd_io_reads;
RRDDIM *rd_io_writes;
RRDSET *st_ops;
RRDDIM *rd_ops_reads;
RRDDIM *rd_ops_writes;
RRDSET *st_qops;
RRDDIM *rd_qops_operations;
RRDSET *st_backlog;
RRDDIM *rd_backlog_backlog;
RRDSET *st_util;
RRDDIM *rd_util_utilization;
RRDSET *st_mops;
RRDDIM *rd_mops_reads;
RRDDIM *rd_mops_writes;
RRDSET *st_iotime;
RRDDIM *rd_iotime_reads;
RRDDIM *rd_iotime_writes;
RRDSET *st_await;
RRDDIM *rd_await_reads;
RRDDIM *rd_await_writes;
RRDSET *st_avgsz;
RRDDIM *rd_avgsz_reads;
RRDDIM *rd_avgsz_writes;
RRDSET *st_svctm;
RRDDIM *rd_svctm_svctm;
RRDSET *st_bcache_size;
RRDDIM *rd_bcache_dirty_size;
RRDSET *st_bcache_usage;
RRDDIM *rd_bcache_available_percent;
RRDSET *st_bcache_hit_ratio;
RRDDIM *rd_bcache_hit_ratio_5min;
RRDDIM *rd_bcache_hit_ratio_1hour;
RRDDIM *rd_bcache_hit_ratio_1day;
RRDDIM *rd_bcache_hit_ratio_total;
RRDSET *st_bcache;
RRDDIM *rd_bcache_hits;
RRDDIM *rd_bcache_misses;
RRDDIM *rd_bcache_miss_collisions;
RRDSET *st_bcache_bypass;
RRDDIM *rd_bcache_bypass_hits;
RRDDIM *rd_bcache_bypass_misses;
RRDSET *st_bcache_rates;
RRDDIM *rd_bcache_rate_congested;
RRDDIM *rd_bcache_readaheads;
RRDDIM *rd_bcache_rate_writeback;
RRDSET *st_bcache_cache_allocations;
RRDDIM *rd_bcache_cache_allocations_unused;
RRDDIM *rd_bcache_cache_allocations_clean;
RRDDIM *rd_bcache_cache_allocations_dirty;
RRDDIM *rd_bcache_cache_allocations_metadata;
RRDDIM *rd_bcache_cache_allocations_unknown;
RRDSET *st_bcache_cache_read_races;
RRDDIM *rd_bcache_cache_read_races;
RRDDIM *rd_bcache_cache_io_errors;
struct disk *next;
} *disk_root = NULL;
#define rrdset_obsolete_and_pointer_null(st) do { if(st) { rrdset_is_obsolete(st); (st) = NULL; } } while(st)
// static char *path_to_get_hw_sector_size = NULL;
// static char *path_to_get_hw_sector_size_partitions = NULL;
static char *path_to_sys_dev_block_major_minor_string = NULL;
static char *path_to_sys_block_device = NULL;
static char *path_to_sys_block_device_bcache = NULL;
static char *path_to_sys_devices_virtual_block_device = NULL;
static char *path_to_device_mapper = NULL;
static char *path_to_device_label = NULL;
static char *path_to_device_id = NULL;
static char *path_to_veritas_volume_groups = NULL;
static int name_disks_by_id = CONFIG_BOOLEAN_NO;
static int global_bcache_priority_stats_update_every = 0; // disabled by default
static int global_enable_new_disks_detected_at_runtime = CONFIG_BOOLEAN_YES,
global_enable_performance_for_physical_disks = CONFIG_BOOLEAN_AUTO,
global_enable_performance_for_virtual_disks = CONFIG_BOOLEAN_AUTO,
global_enable_performance_for_partitions = CONFIG_BOOLEAN_NO,
global_do_io = CONFIG_BOOLEAN_AUTO,
global_do_ops = CONFIG_BOOLEAN_AUTO,
global_do_mops = CONFIG_BOOLEAN_AUTO,
global_do_iotime = CONFIG_BOOLEAN_AUTO,
global_do_qops = CONFIG_BOOLEAN_AUTO,
global_do_util = CONFIG_BOOLEAN_AUTO,
global_do_backlog = CONFIG_BOOLEAN_AUTO,
global_do_bcache = CONFIG_BOOLEAN_AUTO,
globals_initialized = 0,
global_cleanup_removed_disks = 1;
static SIMPLE_PATTERN *excluded_disks = NULL;
static unsigned long long int bcache_read_number_with_units(const char *filename) {
char buffer[50 + 1];
if(read_file(filename, buffer, 50) == 0) {
static int unknown_units_error = 10;
char *end = NULL;
long double value = str2ld(buffer, &end);
if(end && *end) {
if(*end == 'k')
return (unsigned long long int)(value * 1024.0);
else if(*end == 'M')
return (unsigned long long int)(value * 1024.0 * 1024.0);
else if(*end == 'G')
return (unsigned long long int)(value * 1024.0 * 1024.0 * 1024.0);
else if(unknown_units_error > 0) {
error("bcache file '%s' provides value '%s' with unknown units '%s'", filename, buffer, end);
unknown_units_error--;
}
}
return (unsigned long long int)value;
}
return 0;
}
void bcache_read_priority_stats(struct disk *d, const char *family, int update_every, usec_t dt) {
static procfile *ff = NULL;
static char *separators = " \t:%[]";
static ARL_BASE *arl_base = NULL;
static unsigned long long unused;
static unsigned long long clean;
static unsigned long long dirty;
static unsigned long long metadata;
static unsigned long long unknown;
// check if it is time to update this metric
d->bcache_priority_stats_elapsed_usec += dt;
if(likely(d->bcache_priority_stats_elapsed_usec < d->bcache_priority_stats_update_every_usec)) return;
d->bcache_priority_stats_elapsed_usec = 0;
// initialize ARL
if(unlikely(!arl_base)) {
arl_base = arl_create("bcache/priority_stats", NULL, 60);
arl_expect(arl_base, "Unused", &unused);
arl_expect(arl_base, "Clean", &clean);
arl_expect(arl_base, "Dirty", &dirty);
arl_expect(arl_base, "Metadata", &metadata);
}
ff = procfile_reopen(ff, d->bcache_filename_priority_stats, separators, PROCFILE_FLAG_DEFAULT);
if(likely(ff)) ff = procfile_readall(ff);
if(unlikely(!ff)) {
separators = " \t:%[]";
return;
}
// do not reset the separators on every iteration
separators = NULL;
arl_begin(arl_base);
unused = clean = dirty = metadata = unknown = 0;
size_t lines = procfile_lines(ff), l;
for(l = 0; l < lines ;l++) {
size_t words = procfile_linewords(ff, l);
if(unlikely(words < 2)) {
if(unlikely(words)) error("Cannot read '%s' line %zu. Expected 2 params, read %zu.", d->bcache_filename_priority_stats, l, words);
continue;
}
if(unlikely(arl_check(arl_base,
procfile_lineword(ff, l, 0),
procfile_lineword(ff, l, 1)))) break;
}
unknown = 100 - unused - clean - dirty - metadata;
// create / update the cache allocations chart
{
if(unlikely(!d->st_bcache_cache_allocations)) {
d->st_bcache_cache_allocations = rrdset_create_localhost(
"disk_bcache_cache_alloc"
, d->device
, d->disk
, family
, "disk.bcache_cache_alloc"
, "BCache Cache Allocations"
, "percentage"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_DISKSTATS_NAME
, NETDATA_CHART_PRIO_BCACHE_CACHE_ALLOC
, update_every
, RRDSET_TYPE_STACKED
);
d->rd_bcache_cache_allocations_unused = rrddim_add(d->st_bcache_cache_allocations, "unused", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
d->rd_bcache_cache_allocations_dirty = rrddim_add(d->st_bcache_cache_allocations, "dirty", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
d->rd_bcache_cache_allocations_clean = rrddim_add(d->st_bcache_cache_allocations, "clean", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
d->rd_bcache_cache_allocations_metadata = rrddim_add(d->st_bcache_cache_allocations, "metadata", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
d->rd_bcache_cache_allocations_unknown = rrddim_add(d->st_bcache_cache_allocations, "undefined", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
d->bcache_priority_stats_update_every_usec = update_every * USEC_PER_SEC;
}
else rrdset_next(d->st_bcache_cache_allocations);
rrddim_set_by_pointer(d->st_bcache_cache_allocations, d->rd_bcache_cache_allocations_unused, unused);
rrddim_set_by_pointer(d->st_bcache_cache_allocations, d->rd_bcache_cache_allocations_dirty, dirty);
rrddim_set_by_pointer(d->st_bcache_cache_allocations, d->rd_bcache_cache_allocations_clean, clean);
rrddim_set_by_pointer(d->st_bcache_cache_allocations, d->rd_bcache_cache_allocations_metadata, metadata);
rrddim_set_by_pointer(d->st_bcache_cache_allocations, d->rd_bcache_cache_allocations_unknown, unknown);
rrdset_done(d->st_bcache_cache_allocations);
}
}
static inline int is_major_enabled(int major) {
static int8_t *major_configs = NULL;
static size_t major_size = 0;
if(major < 0) return 1;
size_t wanted_size = (size_t)major + 1;
if(major_size < wanted_size) {
major_configs = reallocz(major_configs, wanted_size * sizeof(int8_t));
size_t i;
for(i = major_size; i < wanted_size ; i++)
major_configs[i] = -1;
major_size = wanted_size;
}
if(major_configs[major] == -1) {
char buffer[CONFIG_MAX_NAME + 1];
snprintfz(buffer, CONFIG_MAX_NAME, "performance metrics for disks with major %d", major);
major_configs[major] = (char)config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, buffer, 1);
}
return (int)major_configs[major];
}
static inline int get_disk_name_from_path(const char *path, char *result, size_t result_size, unsigned long major, unsigned long minor, char *disk, char *prefix, int depth) {
//info("DEVICE-MAPPER ('%s', %lu:%lu): examining directory '%s' (allowed depth %d).", disk, major, minor, path, depth);
int found = 0;
DIR *dir = opendir(path);
if (!dir) {
error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot open directory '%s'.", disk, major, minor, path);
goto failed;
}
struct dirent *de = NULL;
while ((de = readdir(dir))) {
if(de->d_type == DT_DIR) {
if((de->d_name[0] == '.' && de->d_name[1] == '\0') || (de->d_name[0] == '.' && de->d_name[1] == '.' && de->d_name[2] == '\0'))
continue;
if(depth <= 0) {
error("DEVICE-MAPPER ('%s', %lu:%lu): Depth limit reached for path '%s/%s'. Ignoring path.", disk, major, minor, path, de->d_name);
break;
}
else {
char *path_nested = NULL;
char *prefix_nested = NULL;
{
char buffer[FILENAME_MAX + 1];
snprintfz(buffer, FILENAME_MAX, "%s/%s", path, de->d_name);
path_nested = strdupz(buffer);
snprintfz(buffer, FILENAME_MAX, "%s%s%s", (prefix)?prefix:"", (prefix)?"_":"", de->d_name);
prefix_nested = strdupz(buffer);
}
found = get_disk_name_from_path(path_nested, result, result_size, major, minor, disk, prefix_nested, depth - 1);
freez(path_nested);
freez(prefix_nested);
if(found) break;
}
}
else if(de->d_type == DT_LNK || de->d_type == DT_BLK) {
char filename[FILENAME_MAX + 1];
if(de->d_type == DT_LNK) {
snprintfz(filename, FILENAME_MAX, "%s/%s", path, de->d_name);
ssize_t len = readlink(filename, result, result_size - 1);
if(len <= 0) {
error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot read link '%s'.", disk, major, minor, filename);
continue;
}
result[len] = '\0';
if(result[0] != '/')
snprintfz(filename, FILENAME_MAX, "%s/%s", path, result);
else
strncpyz(filename, result, FILENAME_MAX);
}
else {
snprintfz(filename, FILENAME_MAX, "%s/%s", path, de->d_name);
}
struct stat sb;
if(stat(filename, &sb) == -1) {
error("DEVICE-MAPPER ('%s', %lu:%lu): Cannot stat() file '%s'.", disk, major, minor, filename);
continue;
}
if((sb.st_mode & S_IFMT) != S_IFBLK) {
//info("DEVICE-MAPPER ('%s', %lu:%lu): file '%s' is not a block device.", disk, major, minor, filename);
continue;
}
if(major(sb.st_rdev) != major || minor(sb.st_rdev) != minor) {
//info("DEVICE-MAPPER ('%s', %lu:%lu): filename '%s' does not match %lu:%lu.", disk, major, minor, filename, (unsigned long)major(sb.st_rdev), (unsigned long)minor(sb.st_rdev));
continue;
}
//info("DEVICE-MAPPER ('%s', %lu:%lu): filename '%s' matches.", disk, major, minor, filename);
snprintfz(result, result_size - 1, "%s%s%s", (prefix)?prefix:"", (prefix)?"_":"", de->d_name);
found = 1;
break;
}
}
closedir(dir);
failed:
if(!found)
result[0] = '\0';
return found;
}
static inline char *get_disk_name(unsigned long major, unsigned long minor, char *disk) {
char result[FILENAME_MAX + 1] = "";
if(!path_to_device_mapper || !*path_to_device_mapper || !get_disk_name_from_path(path_to_device_mapper, result, FILENAME_MAX + 1, major, minor, disk, NULL, 0))
if(!path_to_device_label || !*path_to_device_label || !get_disk_name_from_path(path_to_device_label, result, FILENAME_MAX + 1, major, minor, disk, NULL, 0))
if(!path_to_veritas_volume_groups || !*path_to_veritas_volume_groups || !get_disk_name_from_path(path_to_veritas_volume_groups, result, FILENAME_MAX + 1, major, minor, disk, "vx", 2))
if(name_disks_by_id != CONFIG_BOOLEAN_YES || !path_to_device_id || !*path_to_device_id || !get_disk_name_from_path(path_to_device_id, result, FILENAME_MAX + 1, major, minor, disk, NULL, 0))
strncpy(result, disk, FILENAME_MAX);
if(!result[0])
strncpy(result, disk, FILENAME_MAX);
netdata_fix_chart_name(result);
return strdup(result);
}
static void get_disk_config(struct disk *d) {
int def_enable = global_enable_new_disks_detected_at_runtime;
if(def_enable != CONFIG_BOOLEAN_NO && (simple_pattern_matches(excluded_disks, d->device) || simple_pattern_matches(excluded_disks, d->disk)))
def_enable = CONFIG_BOOLEAN_NO;
char var_name[4096 + 1];
snprintfz(var_name, 4096, CONFIG_SECTION_PLUGIN_PROC_DISKSTATS ":%s", d->disk);
def_enable = config_get_boolean_ondemand(var_name, "enable", def_enable);
if(unlikely(def_enable == CONFIG_BOOLEAN_NO)) {
// the user does not want any metrics for this disk
d->do_io = CONFIG_BOOLEAN_NO;
d->do_ops = CONFIG_BOOLEAN_NO;
d->do_mops = CONFIG_BOOLEAN_NO;
d->do_iotime = CONFIG_BOOLEAN_NO;
d->do_qops = CONFIG_BOOLEAN_NO;
d->do_util = CONFIG_BOOLEAN_NO;
d->do_backlog = CONFIG_BOOLEAN_NO;
d->do_bcache = CONFIG_BOOLEAN_NO;
}
else {
// this disk is enabled
// check its direct settings
int def_performance = CONFIG_BOOLEAN_AUTO;
// since this is 'on demand' we can figure the performance settings
// based on the type of disk
if(!d->device_is_bcache) {
switch(d->type) {
default:
case DISK_TYPE_UNKNOWN:
break;
case DISK_TYPE_PHYSICAL:
def_performance = global_enable_performance_for_physical_disks;
break;
case DISK_TYPE_PARTITION:
def_performance = global_enable_performance_for_partitions;
break;
case DISK_TYPE_VIRTUAL:
def_performance = global_enable_performance_for_virtual_disks;
break;
}
}
// check if we have to disable performance for this disk
if(def_performance)
def_performance = is_major_enabled((int)d->major);
// ------------------------------------------------------------
// now we have def_performance and def_space
// to work further
// def_performance
// check the user configuration (this will also show our 'on demand' decision)
def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
int ddo_io = CONFIG_BOOLEAN_NO,
ddo_ops = CONFIG_BOOLEAN_NO,
ddo_mops = CONFIG_BOOLEAN_NO,
ddo_iotime = CONFIG_BOOLEAN_NO,
ddo_qops = CONFIG_BOOLEAN_NO,
ddo_util = CONFIG_BOOLEAN_NO,
ddo_backlog = CONFIG_BOOLEAN_NO,
ddo_bcache = CONFIG_BOOLEAN_NO;
// we enable individual performance charts only when def_performance is not disabled
if(unlikely(def_performance != CONFIG_BOOLEAN_NO)) {
ddo_io = global_do_io,
ddo_ops = global_do_ops,
ddo_mops = global_do_mops,
ddo_iotime = global_do_iotime,
ddo_qops = global_do_qops,
ddo_util = global_do_util,
ddo_backlog = global_do_backlog,
ddo_bcache = global_do_bcache;
}
d->do_io = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
d->do_ops = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
d->do_mops = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
d->do_iotime = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
d->do_qops = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
d->do_util = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
if(d->device_is_bcache)
d->do_bcache = config_get_boolean_ondemand(var_name, "bcache", ddo_bcache);
else
d->do_bcache = 0;
}
}
static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
static struct mountinfo *disk_mountinfo_root = NULL;
struct disk *d;
// search for it in our RAM list.
// this is sequential, but since we just walk through
// and the number of disks / partitions in a system
// should not be that many, it should be acceptable
for(d = disk_root; d ; d = d->next)
if(unlikely(d->major == major && d->minor == minor))
return d;
// not found
// create a new disk structure
d = (struct disk *)callocz(1, sizeof(struct disk));
d->disk = get_disk_name(major, minor, disk);
d->device = strdupz(disk);
d->major = major;
d->minor = minor;
d->type = DISK_TYPE_UNKNOWN; // Default type. Changed later if not correct.
d->sector_size = 512; // the default, will be changed below
d->next = NULL;
// append it to the list
if(unlikely(!disk_root))
disk_root = d;
else {
struct disk *last;
for(last = disk_root; last->next ;last = last->next);
last->next = d;
}
char buffer[FILENAME_MAX + 1];
// find if it is a physical disk
// by checking if /sys/block/DISK is readable.
snprintfz(buffer, FILENAME_MAX, path_to_sys_block_device, disk);
if(likely(access(buffer, R_OK) == 0)) {
// assign it here, but it will be overwritten if it is not a physical disk
d->type = DISK_TYPE_PHYSICAL;
}
// find if it is a partition
// by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
snprintfz(buffer, FILENAME_MAX, path_to_sys_dev_block_major_minor_string, major, minor, "partition");
if(likely(access(buffer, R_OK) == 0)) {
d->type = DISK_TYPE_PARTITION;
}
else {
// find if it is a virtual disk
// by checking if /sys/devices/virtual/block/DISK is readable.
snprintfz(buffer, FILENAME_MAX, path_to_sys_devices_virtual_block_device, disk);
if(likely(access(buffer, R_OK) == 0)) {
d->type = DISK_TYPE_VIRTUAL;
}
else {
// find if it is a virtual device
// by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
snprintfz(buffer, FILENAME_MAX, path_to_sys_dev_block_major_minor_string, major, minor, "slaves/");
DIR *dirp = opendir(buffer);
if (likely(dirp != NULL)) {
struct dirent *dp;
while ((dp = readdir(dirp))) {
// . and .. are also files in empty folders.
if (unlikely(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)) {
continue;
}
d->type = DISK_TYPE_VIRTUAL;
// Stop the loop after we found one file.
break;
}
if (unlikely(closedir(dirp) == -1))
error("Unable to close dir %s", buffer);
}
}
}
// ------------------------------------------------------------------------
// check if we can find its mount point
// mountinfo_find() can be called with NULL disk_mountinfo_root
struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
if(unlikely(!mi)) {
// mountinfo_free_all can be called with NULL
mountinfo_free_all(disk_mountinfo_root);
disk_mountinfo_root = mountinfo_read(0);
mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
}
if(unlikely(mi))
d->mount_point = strdupz(mi->mount_point);
else
d->mount_point = NULL;
// ------------------------------------------------------------------------
// find the disk sector size
/*
* sector size is always 512 bytes inside the kernel #3481
*
{
char tf[FILENAME_MAX + 1], *t;
strncpyz(tf, d->device, FILENAME_MAX);
// replace all / with !
for(t = tf; *t ;t++)
if(unlikely(*t == '/')) *t = '!';
if(likely(d->type == DISK_TYPE_PARTITION))
snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
else
snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
FILE *fpss = fopen(buffer, "r");
if(likely(fpss)) {
char buffer2[1024 + 1];
char *tmp = fgets(buffer2, 1024, fpss);
if(likely(tmp)) {
d->sector_size = str2i(tmp);
if(unlikely(d->sector_size <= 0)) {
error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->device, buffer);
d->sector_size = 512;
}
}
else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->device, buffer);
fclose(fpss);
}
else error("Cannot read sector size for device %s from %s. Assuming 512.", d->device, buffer);
}
*/
// ------------------------------------------------------------------------
// check if the device is a bcache
struct stat bcache;
snprintfz(buffer, FILENAME_MAX, path_to_sys_block_device_bcache, disk);
if(unlikely(stat(buffer, &bcache) == 0 && (bcache.st_mode & S_IFMT) == S_IFDIR)) {
// we have the 'bcache' directory
d->device_is_bcache = 1;
char buffer2[FILENAME_MAX + 1];
snprintfz(buffer2, FILENAME_MAX, "%s/cache/congested", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_cache_congested = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/readahead", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_readaheads = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/cache/cache0/priority_stats", buffer); // only one cache is supported by bcache
if(access(buffer2, R_OK) == 0)
d->bcache_filename_priority_stats = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/cache/internal/cache_read_races", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_cache_read_races = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/cache/cache0/io_errors", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_cache_io_errors = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/dirty_data", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_dirty_data = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/writeback_rate", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_writeback_rate = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/cache/cache_available_percent", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_cache_available_percent = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_hits", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_hits = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_five_minute/cache_hit_ratio", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_five_minute_cache_hit_ratio = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_hour/cache_hit_ratio", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_hour_cache_hit_ratio = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_day/cache_hit_ratio", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_day_cache_hit_ratio = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_hit_ratio", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_hit_ratio = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_misses", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_misses = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_bypass_hits", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_bypass_hits = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_bypass_misses", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_bypass_misses = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
snprintfz(buffer2, FILENAME_MAX, "%s/stats_total/cache_miss_collisions", buffer);
if(access(buffer2, R_OK) == 0)
d->bcache_filename_stats_total_cache_miss_collisions = strdupz(buffer2);
else
error("bcache file '%s' cannot be read.", buffer2);
}
get_disk_config(d);
return d;
}
int do_proc_diskstats(int update_every, usec_t dt) {
static procfile *ff = NULL;
if(unlikely(!globals_initialized)) {
globals_initialized = 1;
global_enable_new_disks_detected_at_runtime = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "enable new disks detected at runtime", global_enable_new_disks_detected_at_runtime);
global_enable_performance_for_physical_disks = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "performance metrics for physical disks", global_enable_performance_for_physical_disks);
global_enable_performance_for_virtual_disks = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "performance metrics for virtual disks", global_enable_performance_for_virtual_disks);
global_enable_performance_for_partitions = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "performance metrics for partitions", global_enable_performance_for_partitions);
global_do_io = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "bandwidth for all disks", global_do_io);
global_do_ops = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "operations for all disks", global_do_ops);
global_do_mops = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "merged operations for all disks", global_do_mops);
global_do_iotime = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "i/o time for all disks", global_do_iotime);
global_do_qops = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "queued operations for all disks", global_do_qops);
global_do_util = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "utilization percentage for all disks", global_do_util);
global_do_backlog = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "backlog for all disks", global_do_backlog);
global_do_bcache = config_get_boolean_ondemand(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "bcache for all disks", global_do_bcache);
global_bcache_priority_stats_update_every = (int)config_get_number(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "bcache priority stats update every", global_bcache_priority_stats_update_every);
global_cleanup_removed_disks = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "remove charts of removed disks" , global_cleanup_removed_disks);
char buffer[FILENAME_MAX + 1];
snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s");
path_to_sys_block_device = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get block device", buffer);
snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s/bcache");
path_to_sys_block_device_bcache = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get block device bcache", buffer);
snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/devices/virtual/block/%s");
path_to_sys_devices_virtual_block_device = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get virtual block device", buffer);
snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/%s");
path_to_sys_dev_block_major_minor_string = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get block device infos", buffer);
//snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s/queue/hw_sector_size");
//path_to_get_hw_sector_size = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get h/w sector size", buffer);
//snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
//path_to_get_hw_sector_size_partitions = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to get h/w sector size for partitions", buffer);
snprintfz(buffer, FILENAME_MAX, "%s/dev/mapper", netdata_configured_host_prefix);
path_to_device_mapper = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to device mapper", buffer);
snprintfz(buffer, FILENAME_MAX, "%s/dev/disk/by-label", netdata_configured_host_prefix);
path_to_device_label = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to /dev/disk/by-label", buffer);
snprintfz(buffer, FILENAME_MAX, "%s/dev/disk/by-id", netdata_configured_host_prefix);
path_to_device_id = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to /dev/disk/by-id", buffer);
snprintfz(buffer, FILENAME_MAX, "%s/dev/vx/dsk", netdata_configured_host_prefix);
path_to_veritas_volume_groups = config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "path to /dev/vx/dsk", buffer);
name_disks_by_id = config_get_boolean(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "name disks by id", name_disks_by_id);
excluded_disks = simple_pattern_create(
config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "exclude disks", DEFAULT_EXCLUDED_DISKS)
, NULL
, SIMPLE_PATTERN_EXACT
);
}
// --------------------------------------------------------------------------
if(unlikely(!ff)) {
char filename[FILENAME_MAX + 1];
snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/diskstats");
ff = procfile_open(config_get(CONFIG_SECTION_PLUGIN_PROC_DISKSTATS, "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
}
if(unlikely(!ff)) return 0;
ff = procfile_readall(ff);
if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
size_t lines = procfile_lines(ff), l;
collected_number system_read_kb = 0, system_write_kb = 0;
for(l = 0; l < lines ;l++) {
// --------------------------------------------------------------------------
// Read parameters
char *disk;
unsigned long major = 0, minor = 0;
collected_number reads = 0, mreads = 0, readsectors = 0, readms = 0,
writes = 0, mwrites = 0, writesectors = 0, writems = 0,
queued_ios = 0, busy_ms = 0, backlog_ms = 0;
collected_number last_reads = 0, last_readsectors = 0, last_readms = 0,
last_writes = 0, last_writesectors = 0, last_writems = 0,
last_busy_ms = 0;
size_t words = procfile_linewords(ff, l);
if(unlikely(words < 14)) continue;
major = str2ul(procfile_lineword(ff, l, 0));
minor = str2ul(procfile_lineword(ff, l, 1));
disk = procfile_lineword(ff, l, 2);
// # of reads completed # of writes completed
// This is the total number of reads or writes completed successfully.
reads = str2ull(procfile_lineword(ff, l, 3)); // rd_ios
writes = str2ull(procfile_lineword(ff, l, 7)); // wr_ios
// # of reads merged # of writes merged
// Reads and writes which are adjacent to each other may be merged for
// efficiency. Thus two 4K reads may become one 8K read before it is
// ultimately handed to the disk, and so it will be counted (and queued)
mreads = str2ull(procfile_lineword(ff, l, 4)); // rd_merges_or_rd_sec
mwrites = str2ull(procfile_lineword(ff, l, 8)); // wr_merges
// # of sectors read # of sectors written
// This is the total number of sectors read or written successfully.
readsectors = str2ull(procfile_lineword(ff, l, 5)); // rd_sec_or_wr_ios
writesectors = str2ull(procfile_lineword(ff, l, 9)); // wr_sec
// # of milliseconds spent reading # of milliseconds spent writing
// This is the total number of milliseconds spent by all reads or writes (as
// measured from __make_request() to end_that_request_last()).
readms = str2ull(procfile_lineword(ff, l, 6)); // rd_ticks_or_wr_sec
writems = str2ull(procfile_lineword(ff, l, 10)); // wr_ticks
// # of I/Os currently in progress
// The only field that should go to zero. Incremented as requests are
// given to appropriate struct request_queue and decremented as they finish.
queued_ios = str2ull(procfile_lineword(ff, l, 11)); // ios_pgr
// # of milliseconds spent doing I/Os
// This field increases so long as field queued_ios is nonzero.
busy_ms = str2ull(procfile_lineword(ff, l, 12)); // tot_ticks
// weighted # of milliseconds spent doing I/Os
// This field is incremented at each I/O start, I/O completion, I/O
// merge, or read of these stats by the number of I/Os in progress
// (field queued_ios) times the number of milliseconds spent doing I/O since the
// last update of this field. This can provide an easy measure of both
// I/O completion time and the backlog that may be accumulating.
backlog_ms = str2ull(procfile_lineword(ff, l, 13)); // rq_ticks
// --------------------------------------------------------------------------
// remove slashes from disk names
char *s;
for(s = disk; *s ;s++)
if(*s == '/') *s = '_';
// --------------------------------------------------------------------------
// get a disk structure for the disk
struct disk *d = get_disk(major, minor, disk);
d->updated = 1;
// --------------------------------------------------------------------------
// count the global system disk I/O of physical disks
if(unlikely(d->type == DISK_TYPE_PHYSICAL)) {
system_read_kb += readsectors * d->sector_size / 1024;
system_write_kb += writesectors * d->sector_size / 1024;
}
// --------------------------------------------------------------------------
// Set its family based on mount point
char *family = d->mount_point;
if(!family) family = d->disk;
// --------------------------------------------------------------------------
// Do performance metrics
if(d->do_io == CONFIG_BOOLEAN_YES || (d->do_io == CONFIG_BOOLEAN_AUTO && (readsectors || writesectors))) {
d->do_io = CONFIG_BOOLEAN_YES;
if(unlikely(!d->st_io)) {
d->st_io = rrdset_create_localhost(
RRD_TYPE_DISK
, d->device
, d->disk
, family
, "disk.io"
, "Disk I/O Bandwidth"
, "kilobytes/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_DISKSTATS_NAME
, NETDATA_CHART_PRIO_DISK_IO
, update_every
, RRDSET_TYPE_AREA
);
d->rd_io_reads = rrddim_add(d->st_io, "reads", NULL, d->sector_size, 1024, RRD_ALGORITHM_INCREMENTAL);
d->rd_io_writes = rrddim_add(d->st_io, "writes", NULL, d->sector_size * -1, 1024, RRD_ALGORITHM_INCREMENTAL);
}
else rrdset_next(d->st_io);
last_readsectors = rrddim_set_by_pointer(d->st_io, d->rd_io_reads, readsectors);
last_writesectors = rrddim_set_by_pointer(d->st_io, d->rd_io_writes, writesectors);
rrdset_done(d->st_io);
}
// --------------------------------------------------------------------
if(d->do_ops == CONFIG_BOOLEAN_YES || (d->do_ops == CONFIG_BOOLEAN_AUTO && (reads || writes))) {
d->do_ops = CONFIG_BOOLEAN_YES;
if(unlikely(!d->st_ops)) {
d->st_ops = rrdset_create_localhost(
"disk_ops"
, d->device
, d->disk
, family
, "disk.ops"
, "Disk Completed I/O Operations"
, "operations/s"
, PLUGIN_PROC_NAME
, PLUGIN_PROC_MODULE_DISKSTATS_NAME
, NETDATA_CHART_PRIO_DISK_OPS
, update_every
, RRDSET_TYPE_LINE
);