src/proc_diskstats.c

   1 #include "common.h"
   2
   3 #define RRD_TYPE_DISK "disk"
   4
   5 #define DISK_TYPE_PHYSICAL  1
   6 #define DISK_TYPE_PARTITION 2
   7 #define DISK_TYPE_CONTAINER 3
   8
   9 static struct disk {
  10     char *disk;             // the name of the disk (sda, sdb, etc)
  11     unsigned long major;
  12     unsigned long minor;
  13     int sector_size;
  14     int type;
  15     char *mount_point;
  16
  17     // disk options caching
  18     int configured;
  19     int do_io;
  20     int do_ops;
  21     int do_mops;
  22     int do_iotime;
  23     int do_qops;
  24     int do_util;
  25     int do_backlog;
  26     int do_space;
  27     int do_inodes;
  28
  29     struct disk *next;
  30 } *disk_root = NULL;
  31
  32 /* Return true if N is a known integer value.  On many file systems,
  33    UINTMAX_MAX represents an unknown value; on AIX, UINTMAX_MAX - 1
  34    represents unknown.  Use a rule that works on AIX file systems, and
  35    that almost-always works on other types.  */
  36 static inline int known_value (uintmax_t n) { return n < UINTMAX_MAX - 1; }
  37
  38 static inline void disk_space_stats(struct disk *d, const char *disk, const char *family, int update_every, unsigned long long dt) {
  39     struct statvfs buff_statvfs;
  40     RRDSET *st;
  41
  42     if (statvfs(d->mount_point, &buff_statvfs) < 0)
  43         error("Failed statvfs() for '%s' (disk '%s')", d->mount_point, d->disk);
  44     else {
  45         struct stat buff_stat;
  46
  47         // verify we collected the metrics for the right disk.
  48         // if not the mountpoint has changed.
  49
  50         if(stat(d->mount_point, &buff_stat) == -1)
  51             error("Failed to stat() for '%s' (disk '%s')", d->mount_point, d->disk);
  52         else {
  53             if(major(buff_stat.st_dev) == d->major && minor(buff_stat.st_dev) == d->minor) {
  54
  55                 // http://stackoverflow.com/a/4965511
  56                 // taken from get_fs_usage() found in coreutils
  57                 unsigned long bsize = (buff_statvfs.f_frsize) ? buff_statvfs.f_frsize : buff_statvfs.f_bsize;
  58
  59                 fsblkcnt_t bavail         = buff_statvfs.f_bavail;
  60                 fsblkcnt_t btotal         = buff_statvfs.f_blocks;
  61                 fsblkcnt_t bavail_root    = buff_statvfs.f_bfree;
  62                 fsblkcnt_t breserved_root = bavail_root - bavail;
  63                 fsblkcnt_t bused;
  64                 if(likely(btotal >= bavail_root))
  65                     bused = btotal - bavail_root;
  66                 else
  67                     bused = bavail_root - btotal;
  68
  69 #ifdef NETDATA_INTERNAL_CHECKS
  70                 if(unlikely(btotal != bavail + breserved_root + bused))
  71                     error("Disk block statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", d->mount_point, d->disk, (unsigned long long)btotal, (unsigned long long)bavail, (unsigned long long)breserved_root, (unsigned long long)bused);
  72 #endif
  73
  74                 // --------------------------------------------------------------------------
  75
  76                 fsfilcnt_t favail         = buff_statvfs.f_favail;
  77                 fsfilcnt_t ftotal         = buff_statvfs.f_files;
  78                 fsfilcnt_t favail_root    = buff_statvfs.f_ffree;
  79                 fsfilcnt_t freserved_root = favail_root - favail;
  80                 fsfilcnt_t fused          = ftotal - favail_root;
  81
  82 #ifdef NETDATA_INTERNAL_CHECKS
  83                 if(unlikely(btotal != bavail + breserved_root + bused))
  84                     error("Disk inode statistics for '%s' (disk '%s') do not sum up: total = %llu, available = %llu, reserved = %llu, used = %llu", d->mount_point, d->disk, (unsigned long long)ftotal, (unsigned long long)favail, (unsigned long long)freserved_root, (unsigned long long)fused);
  85 #endif
  86
  87                 // --------------------------------------------------------------------------
  88
  89                 if(d->do_space == CONFIG_ONDEMAND_YES || (d->do_space == CONFIG_ONDEMAND_ONDEMAND && (bavail || breserved_root || bused))) {
  90                     d->do_space = CONFIG_ONDEMAND_YES;
  91
  92                     st = rrdset_find_bytype("disk_space", disk);
  93                     if(!st) {
  94                         st = rrdset_create("disk_space", disk, NULL, family, "disk.space", "Disk Space Usage", "GB", 2023, update_every, RRDSET_TYPE_STACKED);
  95                         st->isdetail = 1;
  96
  97                         rrddim_add(st, "avail", NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
  98                         rrddim_add(st, "used" , NULL, bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
  99                         rrddim_add(st, "reserved_for_root", "reserved for root", bsize, 1024*1024*1024, RRDDIM_ABSOLUTE);
 100                     }
 101                     else rrdset_next_usec(st, dt);
 102
 103                     rrddim_set(st, "avail", bavail);
 104                     rrddim_set(st, "used", bused);
 105                     rrddim_set(st, "reserved_for_root", breserved_root);
 106                     rrdset_done(st);
 107                 }
 108
 109                 // --------------------------------------------------------------------------
 110
 111                 if(d->do_inodes == CONFIG_ONDEMAND_YES || (d->do_inodes == CONFIG_ONDEMAND_ONDEMAND && (favail || freserved_root || fused))) {
 112                     st = rrdset_find_bytype("disk_inodes", disk);
 113                     if(!st) {
 114                         st = rrdset_create("disk_inodes", disk, NULL, family, "disk.inodes", "Disk Inodes Usage", "Inodes", 2024, update_every, RRDSET_TYPE_STACKED);
 115                         st->isdetail = 1;
 116
 117                         rrddim_add(st, "avail", NULL, 1, 1, RRDDIM_ABSOLUTE);
 118                         rrddim_add(st, "used" , NULL, 1, 1, RRDDIM_ABSOLUTE);
 119                         rrddim_add(st, "reserved_for_root", "reserved for root", 1, 1, RRDDIM_ABSOLUTE);
 120                     }
 121                     else rrdset_next_usec(st, dt);
 122
 123                     rrddim_set(st, "avail", favail);
 124                     rrddim_set(st, "used", fused);
 125                     rrddim_set(st, "reserved_for_root", freserved_root);
 126                     rrdset_done(st);
 127                 }
 128             }
 129         }
 130     }
 131 }
 132
 133 static struct mountinfo *disk_mountinfo_root = NULL;
 134
 135 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
 136     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
 137     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
 138     static char path_find_block_device[FILENAME_MAX + 1] = "";
 139     struct disk *d;
 140
 141     // search for it in our RAM list.
 142     // this is sequential, but since we just walk through
 143     // and the number of disks / partitions in a system
 144     // should not be that many, it should be acceptable
 145     for(d = disk_root; d ; d = d->next)
 146         if(unlikely(d->major == major && d->minor == minor))
 147             break;
 148
 149     // if we found it, return it
 150     if(likely(d))
 151         return d;
 152
 153     // not found
 154     // create a new disk structure
 155     d = (struct disk *)mallocz(sizeof(struct disk));
 156
 157     d->disk = strdupz(disk);
 158     d->major = major;
 159     d->minor = minor;
 160     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
 161     d->configured = 0;
 162     d->sector_size = 512; // the default, will be changed below
 163     d->next = NULL;
 164
 165     // append it to the list
 166     if(!disk_root)
 167         disk_root = d;
 168     else {
 169         struct disk *last;
 170         for(last = disk_root; last->next ;last = last->next);
 171         last->next = d;
 172     }
 173
 174     // ------------------------------------------------------------------------
 175     // find the type of the device
 176
 177     char buffer[FILENAME_MAX + 1];
 178
 179     // get the default path for finding info about the block device
 180     if(unlikely(!path_find_block_device[0])) {
 181         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/%s");
 182         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get block device infos", buffer));
 183     }
 184
 185     // find if it is a partition
 186     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
 187     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 188     if(access(buffer, R_OK) == 0) {
 189         d->type = DISK_TYPE_PARTITION;
 190     } else {
 191         // find if it is a container
 192         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 193         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 194         DIR *dirp = opendir(buffer);
 195         if (dirp != NULL) {
 196             struct dirent *dp;
 197             while( (dp = readdir(dirp)) ) {
 198                 // . and .. are also files in empty folders.
 199                 if(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0) {
 200                     continue;
 201                 }
 202
 203                 d->type = DISK_TYPE_CONTAINER;
 204
 205                 // Stop the loop after we found one file.
 206                 break;
 207             }
 208             if(closedir(dirp) == -1)
 209                 error("Unable to close dir %s", buffer);
 210         }
 211     }
 212
 213     // ------------------------------------------------------------------------
 214     // check if we can find its mount point
 215
 216     // mountinfo_find() can be called with NULL disk_mountinfo_root
 217     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 218     if(unlikely(!mi)) {
 219         // mountinfo_free() can be called with NULL disk_mountinfo_root
 220         mountinfo_free(disk_mountinfo_root);
 221
 222         // re-read mountinfo in case something changed
 223         disk_mountinfo_root = mountinfo_read();
 224
 225         // search again for this disk
 226         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 227     }
 228
 229     if(mi)
 230         d->mount_point = strdupz(mi->mount_point);
 231         // no need to check for NULL
 232     else
 233         d->mount_point = NULL;
 234
 235     // ------------------------------------------------------------------------
 236     // find the disk sector size
 237
 238     if(!path_to_get_hw_sector_size[0]) {
 239         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 240         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size", buffer));
 241     }
 242     if(!path_to_get_hw_sector_size_partitions[0]) {
 243         snprintfz(buffer, FILENAME_MAX, "%s%s", global_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 244         snprintfz(path_to_get_hw_sector_size_partitions, FILENAME_MAX, "%s", config_get("plugin:proc:/proc/diskstats", "path to get h/w sector size for partitions", buffer));
 245     }
 246
 247     {
 248         char tf[FILENAME_MAX + 1], *t;
 249         strncpyz(tf, d->disk, FILENAME_MAX);
 250
 251         // replace all / with !
 252         for(t = tf; *t ;t++)
 253             if(*t == '/') *t = '!';
 254
 255         if(d->type == DISK_TYPE_PARTITION)
 256             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 257         else
 258             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 259
 260         FILE *fpss = fopen(buffer, "r");
 261         if(fpss) {
 262             char buffer2[1024 + 1];
 263             char *tmp = fgets(buffer2, 1024, fpss);
 264
 265             if(tmp) {
 266                 d->sector_size = atoi(tmp);
 267                 if(d->sector_size <= 0) {
 268                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 269                     d->sector_size = 512;
 270                 }
 271             }
 272             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 273
 274             fclose(fpss);
 275         }
 276         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 277     }
 278
 279     return d;
 280 }
 281
 282 static inline int select_positive_option(int option1, int option2) {
 283     if(option1 == CONFIG_ONDEMAND_YES || option2 == CONFIG_ONDEMAND_YES)
 284         return CONFIG_ONDEMAND_YES;
 285     else if(option1 == CONFIG_ONDEMAND_ONDEMAND || option2 == CONFIG_ONDEMAND_ONDEMAND)
 286         return CONFIG_ONDEMAND_ONDEMAND;
 287
 288     return CONFIG_ONDEMAND_NO;
 289 }
 290
 291 int do_proc_diskstats(int update_every, unsigned long long dt) {
 292     static procfile *ff = NULL;
 293     static int  global_enable_new_disks_detected_at_runtime = CONFIG_ONDEMAND_YES,
 294                 global_enable_performance_for_physical_disks = CONFIG_ONDEMAND_ONDEMAND,
 295                 global_enable_performance_for_virtual_disks = CONFIG_ONDEMAND_NO,
 296                 global_enable_performance_for_partitions = CONFIG_ONDEMAND_NO,
 297                 global_enable_performance_for_mountpoints = CONFIG_ONDEMAND_NO,
 298                 global_enable_performance_for_virtual_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 299                 global_enable_space_for_mountpoints = CONFIG_ONDEMAND_ONDEMAND,
 300                 global_do_io = CONFIG_ONDEMAND_ONDEMAND,
 301                 global_do_ops = CONFIG_ONDEMAND_ONDEMAND,
 302                 global_do_mops = CONFIG_ONDEMAND_ONDEMAND,
 303                 global_do_iotime = CONFIG_ONDEMAND_ONDEMAND,
 304                 global_do_qops = CONFIG_ONDEMAND_ONDEMAND,
 305                 global_do_util = CONFIG_ONDEMAND_ONDEMAND,
 306                 global_do_backlog = CONFIG_ONDEMAND_ONDEMAND,
 307                 global_do_space = CONFIG_ONDEMAND_ONDEMAND,
 308                 global_do_inodes = CONFIG_ONDEMAND_ONDEMAND,
 309                 globals_initialized = 0;
 310
 311     if(unlikely(!globals_initialized)) {
 312         global_enable_new_disks_detected_at_runtime = config_get_boolean("plugin:proc:/proc/diskstats", "enable new disks detected at runtime", global_enable_new_disks_detected_at_runtime);
 313
 314         global_enable_performance_for_physical_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for physical disks", global_enable_performance_for_physical_disks);
 315         global_enable_performance_for_virtual_disks = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for virtual disks", global_enable_performance_for_virtual_disks);
 316         global_enable_performance_for_partitions = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for partitions", global_enable_performance_for_partitions);
 317         global_enable_performance_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted filesystems", global_enable_performance_for_mountpoints);
 318         global_enable_performance_for_virtual_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "performance metrics for mounted virtual disks", global_enable_performance_for_virtual_mountpoints);
 319         global_enable_space_for_mountpoints = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space metrics for mounted filesystems", global_enable_space_for_mountpoints);
 320
 321         global_do_io      = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "bandwidth for all disks", global_do_io);
 322         global_do_ops     = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "operations for all disks", global_do_ops);
 323         global_do_mops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "merged operations for all disks", global_do_mops);
 324         global_do_iotime  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "i/o time for all disks", global_do_iotime);
 325         global_do_qops    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "queued operations for all disks", global_do_qops);
 326         global_do_util    = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "utilization percentage for all disks", global_do_util);
 327         global_do_backlog = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "backlog for all disks", global_do_backlog);
 328         global_do_space   = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "space usage for all disks", global_do_space);
 329         global_do_inodes  = config_get_boolean_ondemand("plugin:proc:/proc/diskstats", "inodes usage for all disks", global_do_inodes);
 330
 331         globals_initialized = 1;
 332     }
 333
 334     if(!ff) {
 335         char filename[FILENAME_MAX + 1];
 336         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/diskstats");
 337         ff = procfile_open(config_get("plugin:proc:/proc/diskstats", "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 338     }
 339     if(!ff) return 1;
 340
 341     ff = procfile_readall(ff);
 342     if(!ff) return 0; // we return 0, so that we will retry to open it next time
 343
 344     uint32_t lines = procfile_lines(ff), l;
 345     uint32_t words;
 346
 347     for(l = 0; l < lines ;l++) {
 348         // --------------------------------------------------------------------------
 349         // Read parameters
 350
 351         char *disk;
 352         unsigned long       major = 0, minor = 0;
 353
 354         collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 355                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 356                             queued_ios = 0, busy_ms = 0, backlog_ms = 0;
 357
 358         collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 359                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 360                             last_busy_ms = 0;
 361
 362         words = procfile_linewords(ff, l);
 363         if(words < 14) continue;
 364
 365         major           = strtoul(procfile_lineword(ff, l, 0), NULL, 10);
 366         minor           = strtoul(procfile_lineword(ff, l, 1), NULL, 10);
 367         disk            = procfile_lineword(ff, l, 2);
 368
 369         // # of reads completed # of writes completed
 370         // This is the total number of reads or writes completed successfully.
 371         reads           = strtoull(procfile_lineword(ff, l, 3), NULL, 10);  // rd_ios
 372         writes          = strtoull(procfile_lineword(ff, l, 7), NULL, 10);  // wr_ios
 373
 374         // # of reads merged # of writes merged
 375         // Reads and writes which are adjacent to each other may be merged for
 376         // efficiency.  Thus two 4K reads may become one 8K read before it is
 377         // ultimately handed to the disk, and so it will be counted (and queued)
 378         mreads          = strtoull(procfile_lineword(ff, l, 4), NULL, 10);  // rd_merges_or_rd_sec
 379         mwrites         = strtoull(procfile_lineword(ff, l, 8), NULL, 10);  // wr_merges
 380
 381         // # of sectors read # of sectors written
 382         // This is the total number of sectors read or written successfully.
 383         readsectors     = strtoull(procfile_lineword(ff, l, 5), NULL, 10);  // rd_sec_or_wr_ios
 384         writesectors    = strtoull(procfile_lineword(ff, l, 9), NULL, 10);  // wr_sec
 385
 386         // # of milliseconds spent reading # of milliseconds spent writing
 387         // This is the total number of milliseconds spent by all reads or writes (as
 388         // measured from __make_request() to end_that_request_last()).
 389         readms          = strtoull(procfile_lineword(ff, l, 6), NULL, 10);  // rd_ticks_or_wr_sec
 390         writems         = strtoull(procfile_lineword(ff, l, 10), NULL, 10); // wr_ticks
 391
 392         // # of I/Os currently in progress
 393         // The only field that should go to zero. Incremented as requests are
 394         // given to appropriate struct request_queue and decremented as they finish.
 395         queued_ios      = strtoull(procfile_lineword(ff, l, 11), NULL, 10); // ios_pgr
 396
 397         // # of milliseconds spent doing I/Os
 398         // This field increases so long as field queued_ios is nonzero.
 399         busy_ms         = strtoull(procfile_lineword(ff, l, 12), NULL, 10); // tot_ticks
 400
 401         // weighted # of milliseconds spent doing I/Os
 402         // This field is incremented at each I/O start, I/O completion, I/O
 403         // merge, or read of these stats by the number of I/Os in progress
 404         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 405         // last update of this field.  This can provide an easy measure of both
 406         // I/O completion time and the backlog that may be accumulating.
 407         backlog_ms      = strtoull(procfile_lineword(ff, l, 13), NULL, 10); // rq_ticks
 408
 409
 410         // --------------------------------------------------------------------------
 411         // remove slashes from disk names
 412         char *s;
 413         for(s = disk; *s ;s++)
 414             if(*s == '/') *s = '_';
 415
 416         // --------------------------------------------------------------------------
 417         // get a disk structure for the disk
 418
 419         struct disk *d = get_disk(major, minor, disk);
 420
 421
 422         // --------------------------------------------------------------------------
 423         // Set its family based on mount point
 424
 425         char *family = d->mount_point;
 426         if(!family) family = disk;
 427
 428
 429         // --------------------------------------------------------------------------
 430         // Check the configuration for the device
 431
 432         if(unlikely(!d->configured)) {
 433             char var_name[4096 + 1];
 434             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 435
 436             int def_enable = config_get_boolean_ondemand(var_name, "enable", global_enable_new_disks_detected_at_runtime);
 437             if(def_enable == CONFIG_ONDEMAND_NO) {
 438                 // the user does not want any metrics for this disk
 439                 d->do_io = CONFIG_ONDEMAND_NO;
 440                 d->do_ops = CONFIG_ONDEMAND_NO;
 441                 d->do_mops = CONFIG_ONDEMAND_NO;
 442                 d->do_iotime = CONFIG_ONDEMAND_NO;
 443                 d->do_qops = CONFIG_ONDEMAND_NO;
 444                 d->do_util = CONFIG_ONDEMAND_NO;
 445                 d->do_backlog = CONFIG_ONDEMAND_NO;
 446                 d->do_space = CONFIG_ONDEMAND_NO;
 447                 d->do_inodes = CONFIG_ONDEMAND_NO;
 448             }
 449             else {
 450                 // this disk is enabled
 451                 // check its direct settings
 452
 453                 int def_performance = CONFIG_ONDEMAND_ONDEMAND;
 454                 int def_space = (d->mount_point)?CONFIG_ONDEMAND_ONDEMAND:CONFIG_ONDEMAND_NO;
 455
 456                 // since this is 'on demand' we can figure the performance settings
 457                 // based on the type of disk
 458
 459                 switch(d->type) {
 460                     case DISK_TYPE_PHYSICAL:
 461                         def_performance = global_enable_performance_for_physical_disks;
 462                         break;
 463
 464                     case DISK_TYPE_PARTITION:
 465                         def_performance = global_enable_performance_for_partitions;
 466                         break;
 467
 468                     case DISK_TYPE_CONTAINER:
 469                         def_performance = global_enable_performance_for_virtual_disks;
 470
 471                         if(d->mount_point)
 472                             def_performance = select_positive_option(def_performance, global_enable_performance_for_virtual_mountpoints);
 473                         break;
 474                 }
 475
 476                 if(d->mount_point)
 477                     def_performance = select_positive_option(def_performance, global_enable_performance_for_mountpoints);
 478
 479                 // ------------------------------------------------------------
 480                 // now we have def_performance and def_space
 481                 // to work further
 482
 483                 // def_performance
 484                 // check the user configuration (this will also show our 'on demand' decision)
 485                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 486
 487                 int ddo_io = CONFIG_ONDEMAND_NO,
 488                     ddo_ops = CONFIG_ONDEMAND_NO,
 489                     ddo_mops = CONFIG_ONDEMAND_NO,
 490                     ddo_iotime = CONFIG_ONDEMAND_NO,
 491                     ddo_qops = CONFIG_ONDEMAND_NO,
 492                     ddo_util = CONFIG_ONDEMAND_NO,
 493                     ddo_backlog = CONFIG_ONDEMAND_NO;
 494
 495                 // we enable individual performance charts only when def_performance is not disabled
 496                 if(def_performance != CONFIG_ONDEMAND_NO) {
 497                     ddo_io = global_do_io,
 498                     ddo_ops = global_do_ops,
 499                     ddo_mops = global_do_mops,
 500                     ddo_iotime = global_do_iotime,
 501                     ddo_qops = global_do_qops,
 502                     ddo_util = global_do_util,
 503                     ddo_backlog = global_do_backlog;
 504                 }
 505
 506                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 507                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 508                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 509                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 510                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 511                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 512                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 513
 514                 // def_space
 515                 if(d->mount_point) {
 516                     // check the user configuration (this will also show our 'on demand' decision)
 517                     def_space = config_get_boolean_ondemand(var_name, "enable space metrics", def_space);
 518
 519                     int ddo_space = def_space,
 520                         ddo_inodes = def_space;
 521
 522                     d->do_space = config_get_boolean_ondemand(var_name, "space usage", ddo_space);
 523                     d->do_inodes = config_get_boolean_ondemand(var_name, "inodes usage", ddo_inodes);
 524                 }
 525                 else {
 526                     // don't show settings for this disk
 527                     d->do_space = CONFIG_ONDEMAND_NO;
 528                     d->do_inodes = CONFIG_ONDEMAND_NO;
 529                 }
 530             }
 531
 532             d->configured = 1;
 533         }
 534
 535         RRDSET *st;
 536
 537         // --------------------------------------------------------------------------
 538         // Do performance metrics
 539
 540         if(d->do_io == CONFIG_ONDEMAND_YES || (d->do_io == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) {
 541             d->do_io = CONFIG_ONDEMAND_YES;
 542
 543             st = rrdset_find_bytype(RRD_TYPE_DISK, disk);
 544             if(!st) {
 545                 st = rrdset_create(RRD_TYPE_DISK, disk, NULL, family, "disk.io", "Disk I/O Bandwidth", "kilobytes/s", 2000, update_every, RRDSET_TYPE_AREA);
 546
 547                 rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_INCREMENTAL);
 548                 rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_INCREMENTAL);
 549             }
 550             else rrdset_next_usec(st, dt);
 551
 552             last_readsectors  = rrddim_set(st, "reads", readsectors);
 553             last_writesectors = rrddim_set(st, "writes", writesectors);
 554             rrdset_done(st);
 555         }
 556
 557         // --------------------------------------------------------------------
 558
 559         if(d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes))) {
 560             d->do_ops = CONFIG_ONDEMAND_YES;
 561
 562             st = rrdset_find_bytype("disk_ops", disk);
 563             if(!st) {
 564                 st = rrdset_create("disk_ops", disk, NULL, family, "disk.ops", "Disk Completed I/O Operations", "operations/s", 2001, update_every, RRDSET_TYPE_LINE);
 565                 st->isdetail = 1;
 566
 567                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 568                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 569             }
 570             else rrdset_next_usec(st, dt);
 571
 572             last_reads  = rrddim_set(st, "reads", reads);
 573             last_writes = rrddim_set(st, "writes", writes);
 574             rrdset_done(st);
 575         }
 576
 577         // --------------------------------------------------------------------
 578
 579         if(d->do_qops == CONFIG_ONDEMAND_YES || (d->do_qops == CONFIG_ONDEMAND_ONDEMAND && queued_ios)) {
 580             d->do_qops = CONFIG_ONDEMAND_YES;
 581
 582             st = rrdset_find_bytype("disk_qops", disk);
 583             if(!st) {
 584                 st = rrdset_create("disk_qops", disk, NULL, family, "disk.qops", "Disk Current I/O Operations", "operations", 2002, update_every, RRDSET_TYPE_LINE);
 585                 st->isdetail = 1;
 586
 587                 rrddim_add(st, "operations", NULL, 1, 1, RRDDIM_ABSOLUTE);
 588             }
 589             else rrdset_next_usec(st, dt);
 590
 591             rrddim_set(st, "operations", queued_ios);
 592             rrdset_done(st);
 593         }
 594
 595         // --------------------------------------------------------------------
 596
 597         if(d->do_backlog == CONFIG_ONDEMAND_YES || (d->do_backlog == CONFIG_ONDEMAND_ONDEMAND && backlog_ms)) {
 598             d->do_backlog = CONFIG_ONDEMAND_YES;
 599
 600             st = rrdset_find_bytype("disk_backlog", disk);
 601             if(!st) {
 602                 st = rrdset_create("disk_backlog", disk, NULL, family, "disk.backlog", "Disk Backlog", "backlog (ms)", 2003, update_every, RRDSET_TYPE_AREA);
 603                 st->isdetail = 1;
 604
 605                 rrddim_add(st, "backlog", NULL, 1, 10, RRDDIM_INCREMENTAL);
 606             }
 607             else rrdset_next_usec(st, dt);
 608
 609             rrddim_set(st, "backlog", backlog_ms);
 610             rrdset_done(st);
 611         }
 612
 613         // --------------------------------------------------------------------
 614
 615         if(d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) {
 616             d->do_util = CONFIG_ONDEMAND_YES;
 617
 618             st = rrdset_find_bytype("disk_util", disk);
 619             if(!st) {
 620                 st = rrdset_create("disk_util", disk, NULL, family, "disk.util", "Disk Utilization Time", "% of time working", 2004, update_every, RRDSET_TYPE_AREA);
 621                 st->isdetail = 1;
 622
 623                 rrddim_add(st, "utilization", NULL, 1, 10, RRDDIM_INCREMENTAL);
 624             }
 625             else rrdset_next_usec(st, dt);
 626
 627             last_busy_ms = rrddim_set(st, "utilization", busy_ms);
 628             rrdset_done(st);
 629         }
 630
 631         // --------------------------------------------------------------------
 632
 633         if(d->do_mops == CONFIG_ONDEMAND_YES || (d->do_mops == CONFIG_ONDEMAND_ONDEMAND && (mreads || mwrites))) {
 634             d->do_mops = CONFIG_ONDEMAND_YES;
 635
 636             st = rrdset_find_bytype("disk_mops", disk);
 637             if(!st) {
 638                 st = rrdset_create("disk_mops", disk, NULL, family, "disk.mops", "Disk Merged Operations", "merged operations/s", 2021, update_every, RRDSET_TYPE_LINE);
 639                 st->isdetail = 1;
 640
 641                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 642                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 643             }
 644             else rrdset_next_usec(st, dt);
 645
 646             rrddim_set(st, "reads", mreads);
 647             rrddim_set(st, "writes", mwrites);
 648             rrdset_done(st);
 649         }
 650
 651         // --------------------------------------------------------------------
 652
 653         if(d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) {
 654             d->do_iotime = CONFIG_ONDEMAND_YES;
 655
 656             st = rrdset_find_bytype("disk_iotime", disk);
 657             if(!st) {
 658                 st = rrdset_create("disk_iotime", disk, NULL, family, "disk.iotime", "Disk Total I/O Time", "milliseconds/s", 2022, update_every, RRDSET_TYPE_LINE);
 659                 st->isdetail = 1;
 660
 661                 rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_INCREMENTAL);
 662                 rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_INCREMENTAL);
 663             }
 664             else rrdset_next_usec(st, dt);
 665
 666             last_readms  = rrddim_set(st, "reads", readms);
 667             last_writems = rrddim_set(st, "writes", writems);
 668             rrdset_done(st);
 669         }
 670
 671         // --------------------------------------------------------------------
 672         // calculate differential charts
 673         // only if this is not the first time we run
 674
 675         if(dt) {
 676             if( (d->do_iotime == CONFIG_ONDEMAND_YES || (d->do_iotime == CONFIG_ONDEMAND_ONDEMAND && (readms || writems))) &&
 677                 (d->do_ops    == CONFIG_ONDEMAND_YES || (d->do_ops    == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 678                 st = rrdset_find_bytype("disk_await", disk);
 679                 if(!st) {
 680                     st = rrdset_create("disk_await", disk, NULL, family, "disk.await", "Average Completed I/O Operation Time", "ms per operation", 2005, update_every, RRDSET_TYPE_LINE);
 681                     st->isdetail = 1;
 682
 683                     rrddim_add(st, "reads", NULL, 1, 1, RRDDIM_ABSOLUTE);
 684                     rrddim_add(st, "writes", NULL, -1, 1, RRDDIM_ABSOLUTE);
 685                 }
 686                 else rrdset_next_usec(st, dt);
 687
 688                 rrddim_set(st, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 689                 rrddim_set(st, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 690                 rrdset_done(st);
 691             }
 692
 693             if( (d->do_io  == CONFIG_ONDEMAND_YES || (d->do_io  == CONFIG_ONDEMAND_ONDEMAND && (readsectors || writesectors))) &&
 694                 (d->do_ops == CONFIG_ONDEMAND_YES || (d->do_ops == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 695                 st = rrdset_find_bytype("disk_avgsz", disk);
 696                 if(!st) {
 697                     st = rrdset_create("disk_avgsz", disk, NULL, family, "disk.avgsz", "Average Completed I/O Operation Bandwidth", "kilobytes per operation", 2006, update_every, RRDSET_TYPE_AREA);
 698                     st->isdetail = 1;
 699
 700                     rrddim_add(st, "reads", NULL, d->sector_size, 1024, RRDDIM_ABSOLUTE);
 701                     rrddim_add(st, "writes", NULL, d->sector_size * -1, 1024, RRDDIM_ABSOLUTE);
 702                 }
 703                 else rrdset_next_usec(st, dt);
 704
 705                 rrddim_set(st, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 706                 rrddim_set(st, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 707                 rrdset_done(st);
 708             }
 709
 710             if( (d->do_util == CONFIG_ONDEMAND_YES || (d->do_util == CONFIG_ONDEMAND_ONDEMAND && busy_ms)) &&
 711                 (d->do_ops  == CONFIG_ONDEMAND_YES || (d->do_ops  == CONFIG_ONDEMAND_ONDEMAND && (reads || writes)))) {
 712                 st = rrdset_find_bytype("disk_svctm", disk);
 713                 if(!st) {
 714                     st = rrdset_create("disk_svctm", disk, NULL, family, "disk.svctm", "Average Service Time", "ms per operation", 2007, update_every, RRDSET_TYPE_LINE);
 715                     st->isdetail = 1;
 716
 717                     rrddim_add(st, "svctm", NULL, 1, 1, RRDDIM_ABSOLUTE);
 718                 }
 719                 else rrdset_next_usec(st, dt);
 720
 721                 rrddim_set(st, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 722                 rrdset_done(st);
 723             }
 724         }
 725
 726         // --------------------------------------------------------------------------
 727         // space metrics
 728
 729         if(d->mount_point && (d->do_space || d->do_inodes) ) {
 730             disk_space_stats(d, disk, family, update_every, dt);
 731         }
 732     }
 733
 734     return 0;
 735 }