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 #define CONFIG_SECTION_DISKSTATS "plugin:proc:/proc/diskstats"
  10 #define DELAULT_EXLUDED_DISKS "loop* ram*"
  11
  12 static struct disk {
  13     char *disk;             // the name of the disk (sda, sdb, etc)
  14     unsigned long major;
  15     unsigned long minor;
  16     int sector_size;
  17     int type;
  18
  19     char *mount_point;
  20
  21     // disk options caching
  22     int configured;
  23     int do_io;
  24     int do_ops;
  25     int do_mops;
  26     int do_iotime;
  27     int do_qops;
  28     int do_util;
  29     int do_backlog;
  30
  31     int updated;
  32
  33     RRDSET *st_avgsz;
  34     RRDSET *st_await;
  35     RRDSET *st_backlog;
  36     RRDSET *st_io;
  37     RRDSET *st_iotime;
  38     RRDSET *st_mops;
  39     RRDSET *st_ops;
  40     RRDSET *st_qops;
  41     RRDSET *st_svctm;
  42     RRDSET *st_util;
  43
  44     struct disk *next;
  45 } *disk_root = NULL;
  46
  47 #define rrdset_obsolete_and_pointer_null(st) do { if(st) { rrdset_flag_set(st, RRDSET_FLAG_OBSOLETE); st = NULL; } } while(st)
  48
  49 static struct disk *get_disk(unsigned long major, unsigned long minor, char *disk) {
  50     static char path_to_get_hw_sector_size[FILENAME_MAX + 1] = "";
  51     static char path_to_get_hw_sector_size_partitions[FILENAME_MAX + 1] = "";
  52     static char path_find_block_device[FILENAME_MAX + 1] = "";
  53     static struct mountinfo *disk_mountinfo_root = NULL;
  54
  55     struct disk *d;
  56
  57     // search for it in our RAM list.
  58     // this is sequential, but since we just walk through
  59     // and the number of disks / partitions in a system
  60     // should not be that many, it should be acceptable
  61     for(d = disk_root; d ; d = d->next)
  62         if(unlikely(d->major == major && d->minor == minor))
  63             return d;
  64
  65     // not found
  66     // create a new disk structure
  67     d = (struct disk *)callocz(1, sizeof(struct disk));
  68
  69     d->disk = strdupz(disk);
  70     d->major = major;
  71     d->minor = minor;
  72     d->type = DISK_TYPE_PHYSICAL; // Default type. Changed later if not correct.
  73     d->configured = 0;
  74     d->sector_size = 512; // the default, will be changed below
  75     d->next = NULL;
  76
  77     // append it to the list
  78     if(unlikely(!disk_root))
  79         disk_root = d;
  80     else {
  81         struct disk *last;
  82         for(last = disk_root; last->next ;last = last->next);
  83         last->next = d;
  84     }
  85
  86     // ------------------------------------------------------------------------
  87     // find the type of the device
  88
  89     char buffer[FILENAME_MAX + 1];
  90
  91     // get the default path for finding info about the block device
  92     if(unlikely(!path_find_block_device[0])) {
  93         snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/%s");
  94         snprintfz(path_find_block_device, FILENAME_MAX, "%s", config_get(CONFIG_SECTION_DISKSTATS, "path to get block device infos", buffer));
  95     }
  96
  97     // find if it is a partition
  98     // by checking if /sys/dev/block/MAJOR:MINOR/partition is readable.
  99     snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "partition");
 100     if(likely(access(buffer, R_OK) == 0)) {
 101         d->type = DISK_TYPE_PARTITION;
 102     }
 103     else {
 104         // find if it is a container
 105         // by checking if /sys/dev/block/MAJOR:MINOR/slaves has entries
 106         snprintfz(buffer, FILENAME_MAX, path_find_block_device, major, minor, "slaves/");
 107         DIR *dirp = opendir(buffer);
 108         if(likely(dirp != NULL)) {
 109             struct dirent *dp;
 110             while( (dp = readdir(dirp)) ) {
 111                 // . and .. are also files in empty folders.
 112                 if(unlikely(strcmp(dp->d_name, ".") == 0 || strcmp(dp->d_name, "..") == 0)) {
 113                     continue;
 114                 }
 115
 116                 d->type = DISK_TYPE_CONTAINER;
 117
 118                 // Stop the loop after we found one file.
 119                 break;
 120             }
 121             if(unlikely(closedir(dirp) == -1))
 122                 error("Unable to close dir %s", buffer);
 123         }
 124     }
 125
 126     // ------------------------------------------------------------------------
 127     // check if we can find its mount point
 128
 129     // mountinfo_find() can be called with NULL disk_mountinfo_root
 130     struct mountinfo *mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 131     if(unlikely(!mi)) {
 132         // mountinfo_free can be called with NULL
 133         mountinfo_free(disk_mountinfo_root);
 134         disk_mountinfo_root = mountinfo_read(0);
 135         mi = mountinfo_find(disk_mountinfo_root, d->major, d->minor);
 136     }
 137
 138     if(unlikely(mi))
 139         d->mount_point = strdupz(mi->mount_point);
 140     else
 141         d->mount_point = NULL;
 142
 143     // ------------------------------------------------------------------------
 144     // find the disk sector size
 145
 146     if(unlikely(!path_to_get_hw_sector_size[0])) {
 147         snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/block/%s/queue/hw_sector_size");
 148         snprintfz(path_to_get_hw_sector_size, FILENAME_MAX, "%s", config_get(CONFIG_SECTION_DISKSTATS, "path to get h/w sector size", buffer));
 149     }
 150     if(unlikely(!path_to_get_hw_sector_size_partitions[0])) {
 151         snprintfz(buffer, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/dev/block/%lu:%lu/subsystem/%s/../queue/hw_sector_size");
 152         snprintfz(path_to_get_hw_sector_size_partitions, FILENAME_MAX, "%s", config_get(CONFIG_SECTION_DISKSTATS, "path to get h/w sector size for partitions", buffer));
 153     }
 154
 155     {
 156         char tf[FILENAME_MAX + 1], *t;
 157         strncpyz(tf, d->disk, FILENAME_MAX);
 158
 159         // replace all / with !
 160         for(t = tf; *t ;t++)
 161             if(unlikely(*t == '/')) *t = '!';
 162
 163         if(likely(d->type == DISK_TYPE_PARTITION))
 164             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size_partitions, d->major, d->minor, tf);
 165         else
 166             snprintfz(buffer, FILENAME_MAX, path_to_get_hw_sector_size, tf);
 167
 168         FILE *fpss = fopen(buffer, "r");
 169         if(likely(fpss)) {
 170             char buffer2[1024 + 1];
 171             char *tmp = fgets(buffer2, 1024, fpss);
 172
 173             if(likely(tmp)) {
 174                 d->sector_size = str2i(tmp);
 175                 if(unlikely(d->sector_size <= 0)) {
 176                     error("Invalid sector size %d for device %s in %s. Assuming 512.", d->sector_size, d->disk, buffer);
 177                     d->sector_size = 512;
 178                 }
 179             }
 180             else error("Cannot read data for sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 181
 182             fclose(fpss);
 183         }
 184         else error("Cannot read sector size for device %s from %s. Assuming 512.", d->disk, buffer);
 185     }
 186
 187     return d;
 188 }
 189
 190 static inline int is_major_enabled(int major) {
 191     static int8_t *major_configs = NULL;
 192     static size_t major_size = 0;
 193
 194     if(major < 0) return 1;
 195
 196     size_t wanted_size = (size_t)major + 1;
 197
 198     if(major_size < wanted_size) {
 199         major_configs = reallocz(major_configs, wanted_size * sizeof(int8_t));
 200
 201         size_t i;
 202         for(i = major_size; i < wanted_size ; i++)
 203             major_configs[i] = -1;
 204
 205         major_size = wanted_size;
 206     }
 207
 208     if(major_configs[major] == -1) {
 209         char buffer[CONFIG_MAX_NAME + 1];
 210         snprintfz(buffer, CONFIG_MAX_NAME, "performance metrics for disks with major %d", major);
 211         major_configs[major] = (char)config_get_boolean(CONFIG_SECTION_DISKSTATS, buffer, 1);
 212     }
 213
 214     return (int)major_configs[major];
 215 }
 216
 217 int do_proc_diskstats(int update_every, usec_t dt) {
 218     static procfile *ff = NULL;
 219     static int  global_enable_new_disks_detected_at_runtime = CONFIG_BOOLEAN_YES,
 220                 global_enable_performance_for_physical_disks = CONFIG_BOOLEAN_AUTO,
 221                 global_enable_performance_for_virtual_disks = CONFIG_BOOLEAN_AUTO,
 222                 global_enable_performance_for_partitions = CONFIG_BOOLEAN_NO,
 223                 global_do_io = CONFIG_BOOLEAN_AUTO,
 224                 global_do_ops = CONFIG_BOOLEAN_AUTO,
 225                 global_do_mops = CONFIG_BOOLEAN_AUTO,
 226                 global_do_iotime = CONFIG_BOOLEAN_AUTO,
 227                 global_do_qops = CONFIG_BOOLEAN_AUTO,
 228                 global_do_util = CONFIG_BOOLEAN_AUTO,
 229                 global_do_backlog = CONFIG_BOOLEAN_AUTO,
 230                 globals_initialized = 0;
 231
 232     if(unlikely(!globals_initialized)) {
 233         global_enable_new_disks_detected_at_runtime = config_get_boolean(CONFIG_SECTION_DISKSTATS, "enable new disks detected at runtime", global_enable_new_disks_detected_at_runtime);
 234         global_enable_performance_for_physical_disks = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for physical disks", global_enable_performance_for_physical_disks);
 235         global_enable_performance_for_virtual_disks = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for virtual disks", global_enable_performance_for_virtual_disks);
 236         global_enable_performance_for_partitions = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "performance metrics for partitions", global_enable_performance_for_partitions);
 237
 238         global_do_io      = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "bandwidth for all disks", global_do_io);
 239         global_do_ops     = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "operations for all disks", global_do_ops);
 240         global_do_mops    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "merged operations for all disks", global_do_mops);
 241         global_do_iotime  = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "i/o time for all disks", global_do_iotime);
 242         global_do_qops    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "queued operations for all disks", global_do_qops);
 243         global_do_util    = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "utilization percentage for all disks", global_do_util);
 244         global_do_backlog = config_get_boolean_ondemand(CONFIG_SECTION_DISKSTATS, "backlog for all disks", global_do_backlog);
 245
 246         globals_initialized = 1;
 247     }
 248
 249     // --------------------------------------------------------------------------
 250
 251     if(unlikely(!ff)) {
 252         char filename[FILENAME_MAX + 1];
 253         snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/diskstats");
 254         ff = procfile_open(config_get(CONFIG_SECTION_DISKSTATS, "filename to monitor", filename), " \t", PROCFILE_FLAG_DEFAULT);
 255     }
 256     if(unlikely(!ff)) return 0;
 257
 258     ff = procfile_readall(ff);
 259     if(unlikely(!ff)) return 0; // we return 0, so that we will retry to open it next time
 260
 261     size_t lines = procfile_lines(ff), l;
 262
 263     for(l = 0; l < lines ;l++) {
 264         // --------------------------------------------------------------------------
 265         // Read parameters
 266
 267         char *disk;
 268         unsigned long       major = 0, minor = 0;
 269
 270         collected_number    reads = 0,  mreads = 0,  readsectors = 0,  readms = 0,
 271                             writes = 0, mwrites = 0, writesectors = 0, writems = 0,
 272                             queued_ios = 0, busy_ms = 0, backlog_ms = 0;
 273
 274         collected_number    last_reads = 0,  last_readsectors = 0,  last_readms = 0,
 275                             last_writes = 0, last_writesectors = 0, last_writems = 0,
 276                             last_busy_ms = 0;
 277
 278         size_t words = procfile_linewords(ff, l);
 279         if(unlikely(words < 14)) continue;
 280
 281         major           = str2ul(procfile_lineword(ff, l, 0));
 282         minor           = str2ul(procfile_lineword(ff, l, 1));
 283         disk            = procfile_lineword(ff, l, 2);
 284
 285         // # of reads completed # of writes completed
 286         // This is the total number of reads or writes completed successfully.
 287         reads           = str2ull(procfile_lineword(ff, l, 3));  // rd_ios
 288         writes          = str2ull(procfile_lineword(ff, l, 7));  // wr_ios
 289
 290         // # of reads merged # of writes merged
 291         // Reads and writes which are adjacent to each other may be merged for
 292         // efficiency.  Thus two 4K reads may become one 8K read before it is
 293         // ultimately handed to the disk, and so it will be counted (and queued)
 294         mreads          = str2ull(procfile_lineword(ff, l, 4));  // rd_merges_or_rd_sec
 295         mwrites         = str2ull(procfile_lineword(ff, l, 8));  // wr_merges
 296
 297         // # of sectors read # of sectors written
 298         // This is the total number of sectors read or written successfully.
 299         readsectors     = str2ull(procfile_lineword(ff, l, 5));  // rd_sec_or_wr_ios
 300         writesectors    = str2ull(procfile_lineword(ff, l, 9));  // wr_sec
 301
 302         // # of milliseconds spent reading # of milliseconds spent writing
 303         // This is the total number of milliseconds spent by all reads or writes (as
 304         // measured from __make_request() to end_that_request_last()).
 305         readms          = str2ull(procfile_lineword(ff, l, 6));  // rd_ticks_or_wr_sec
 306         writems         = str2ull(procfile_lineword(ff, l, 10)); // wr_ticks
 307
 308         // # of I/Os currently in progress
 309         // The only field that should go to zero. Incremented as requests are
 310         // given to appropriate struct request_queue and decremented as they finish.
 311         queued_ios      = str2ull(procfile_lineword(ff, l, 11)); // ios_pgr
 312
 313         // # of milliseconds spent doing I/Os
 314         // This field increases so long as field queued_ios is nonzero.
 315         busy_ms         = str2ull(procfile_lineword(ff, l, 12)); // tot_ticks
 316
 317         // weighted # of milliseconds spent doing I/Os
 318         // This field is incremented at each I/O start, I/O completion, I/O
 319         // merge, or read of these stats by the number of I/Os in progress
 320         // (field queued_ios) times the number of milliseconds spent doing I/O since the
 321         // last update of this field.  This can provide an easy measure of both
 322         // I/O completion time and the backlog that may be accumulating.
 323         backlog_ms      = str2ull(procfile_lineword(ff, l, 13)); // rq_ticks
 324
 325
 326         // --------------------------------------------------------------------------
 327         // remove slashes from disk names
 328         char *s;
 329         for(s = disk; *s ;s++)
 330             if(*s == '/') *s = '_';
 331
 332         // --------------------------------------------------------------------------
 333         // get a disk structure for the disk
 334
 335         struct disk *d = get_disk(major, minor, disk);
 336         d->updated = 1;
 337
 338         // --------------------------------------------------------------------------
 339         // Set its family based on mount point
 340
 341         char *family = d->mount_point;
 342         if(!family) family = disk;
 343
 344
 345         // --------------------------------------------------------------------------
 346         // Check the configuration for the device
 347
 348         if(unlikely(!d->configured)) {
 349             d->configured = 1;
 350
 351             static SIMPLE_PATTERN *excluded_disks = NULL;
 352
 353             if(unlikely(!excluded_disks)) {
 354                 excluded_disks = simple_pattern_create(
 355                         config_get(CONFIG_SECTION_DISKSTATS, "exclude disks", DELAULT_EXLUDED_DISKS),
 356                         SIMPLE_PATTERN_EXACT
 357                 );
 358             }
 359
 360             int def_enable = global_enable_new_disks_detected_at_runtime;
 361
 362             if(def_enable != CONFIG_BOOLEAN_NO && simple_pattern_matches(excluded_disks, disk))
 363                 def_enable = CONFIG_BOOLEAN_NO;
 364
 365             char var_name[4096 + 1];
 366             snprintfz(var_name, 4096, "plugin:proc:/proc/diskstats:%s", disk);
 367
 368             def_enable = config_get_boolean_ondemand(var_name, "enable", def_enable);
 369             if(unlikely(def_enable == CONFIG_BOOLEAN_NO)) {
 370                 // the user does not want any metrics for this disk
 371                 d->do_io = CONFIG_BOOLEAN_NO;
 372                 d->do_ops = CONFIG_BOOLEAN_NO;
 373                 d->do_mops = CONFIG_BOOLEAN_NO;
 374                 d->do_iotime = CONFIG_BOOLEAN_NO;
 375                 d->do_qops = CONFIG_BOOLEAN_NO;
 376                 d->do_util = CONFIG_BOOLEAN_NO;
 377                 d->do_backlog = CONFIG_BOOLEAN_NO;
 378             }
 379             else {
 380                 // this disk is enabled
 381                 // check its direct settings
 382
 383                 int def_performance = CONFIG_BOOLEAN_AUTO;
 384
 385                 // since this is 'on demand' we can figure the performance settings
 386                 // based on the type of disk
 387
 388                 switch(d->type) {
 389                     case DISK_TYPE_PHYSICAL:
 390                         def_performance = global_enable_performance_for_physical_disks;
 391                         break;
 392
 393                     case DISK_TYPE_PARTITION:
 394                         def_performance = global_enable_performance_for_partitions;
 395                         break;
 396
 397                     case DISK_TYPE_CONTAINER:
 398                         def_performance = global_enable_performance_for_virtual_disks;
 399                         break;
 400                 }
 401
 402                 // check if we have to disable performance for this disk
 403                 if(def_performance)
 404                     def_performance = is_major_enabled((int)major);
 405
 406                 // ------------------------------------------------------------
 407                 // now we have def_performance and def_space
 408                 // to work further
 409
 410                 // def_performance
 411                 // check the user configuration (this will also show our 'on demand' decision)
 412                 def_performance = config_get_boolean_ondemand(var_name, "enable performance metrics", def_performance);
 413
 414                 int ddo_io = CONFIG_BOOLEAN_NO,
 415                     ddo_ops = CONFIG_BOOLEAN_NO,
 416                     ddo_mops = CONFIG_BOOLEAN_NO,
 417                     ddo_iotime = CONFIG_BOOLEAN_NO,
 418                     ddo_qops = CONFIG_BOOLEAN_NO,
 419                     ddo_util = CONFIG_BOOLEAN_NO,
 420                     ddo_backlog = CONFIG_BOOLEAN_NO;
 421
 422                 // we enable individual performance charts only when def_performance is not disabled
 423                 if(unlikely(def_performance != CONFIG_BOOLEAN_NO)) {
 424                     ddo_io = global_do_io,
 425                     ddo_ops = global_do_ops,
 426                     ddo_mops = global_do_mops,
 427                     ddo_iotime = global_do_iotime,
 428                     ddo_qops = global_do_qops,
 429                     ddo_util = global_do_util,
 430                     ddo_backlog = global_do_backlog;
 431                 }
 432
 433                 d->do_io      = config_get_boolean_ondemand(var_name, "bandwidth", ddo_io);
 434                 d->do_ops     = config_get_boolean_ondemand(var_name, "operations", ddo_ops);
 435                 d->do_mops    = config_get_boolean_ondemand(var_name, "merged operations", ddo_mops);
 436                 d->do_iotime  = config_get_boolean_ondemand(var_name, "i/o time", ddo_iotime);
 437                 d->do_qops    = config_get_boolean_ondemand(var_name, "queued operations", ddo_qops);
 438                 d->do_util    = config_get_boolean_ondemand(var_name, "utilization percentage", ddo_util);
 439                 d->do_backlog = config_get_boolean_ondemand(var_name, "backlog", ddo_backlog);
 440             }
 441         }
 442
 443         // --------------------------------------------------------------------------
 444         // Do performance metrics
 445
 446         if(d->do_io == CONFIG_BOOLEAN_YES || (d->do_io == CONFIG_BOOLEAN_AUTO && (readsectors || writesectors))) {
 447             d->do_io = CONFIG_BOOLEAN_YES;
 448
 449             if(unlikely(!d->st_io)) {
 450                 d->st_io = rrdset_create_localhost(
 451                         RRD_TYPE_DISK
 452                         , disk
 453                         , NULL
 454                         , family
 455                         , "disk.io"
 456                         , "Disk I/O Bandwidth"
 457                         , "kilobytes/s"
 458                         , 2000
 459                         , update_every
 460                         , RRDSET_TYPE_AREA
 461                 );
 462
 463                 rrddim_add(d->st_io, "reads", NULL, d->sector_size, 1024, RRD_ALGORITHM_INCREMENTAL);
 464                 rrddim_add(d->st_io, "writes", NULL, d->sector_size * -1, 1024, RRD_ALGORITHM_INCREMENTAL);
 465             }
 466             else rrdset_next(d->st_io);
 467
 468             last_readsectors  = rrddim_set(d->st_io, "reads", readsectors);
 469             last_writesectors = rrddim_set(d->st_io, "writes", writesectors);
 470             rrdset_done(d->st_io);
 471         }
 472
 473         // --------------------------------------------------------------------
 474
 475         if(d->do_ops == CONFIG_BOOLEAN_YES || (d->do_ops == CONFIG_BOOLEAN_AUTO && (reads || writes))) {
 476             d->do_ops = CONFIG_BOOLEAN_YES;
 477
 478             if(unlikely(!d->st_ops)) {
 479                 d->st_ops = rrdset_create_localhost(
 480                         "disk_ops"
 481                         , disk
 482                         , NULL
 483                         , family
 484                         , "disk.ops"
 485                         , "Disk Completed I/O Operations"
 486                         , "operations/s"
 487                         , 2001
 488                         , update_every
 489                         , RRDSET_TYPE_LINE
 490                 );
 491
 492                 rrdset_flag_set(d->st_ops, RRDSET_FLAG_DETAIL);
 493
 494                 rrddim_add(d->st_ops, "reads", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
 495                 rrddim_add(d->st_ops, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
 496             }
 497             else rrdset_next(d->st_ops);
 498
 499             last_reads  = rrddim_set(d->st_ops, "reads", reads);
 500             last_writes = rrddim_set(d->st_ops, "writes", writes);
 501             rrdset_done(d->st_ops);
 502         }
 503
 504         // --------------------------------------------------------------------
 505
 506         if(d->do_qops == CONFIG_BOOLEAN_YES || (d->do_qops == CONFIG_BOOLEAN_AUTO && queued_ios)) {
 507             d->do_qops = CONFIG_BOOLEAN_YES;
 508
 509             if(unlikely(!d->st_qops)) {
 510                 d->st_qops = rrdset_create_localhost(
 511                         "disk_qops"
 512                         , disk
 513                         , NULL
 514                         , family
 515                         , "disk.qops"
 516                         , "Disk Current I/O Operations"
 517                         , "operations"
 518                         , 2002
 519                         , update_every
 520                         , RRDSET_TYPE_LINE
 521                 );
 522
 523                 rrdset_flag_set(d->st_qops, RRDSET_FLAG_DETAIL);
 524
 525                 rrddim_add(d->st_qops, "operations", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
 526             }
 527             else rrdset_next(d->st_qops);
 528
 529             rrddim_set(d->st_qops, "operations", queued_ios);
 530             rrdset_done(d->st_qops);
 531         }
 532
 533         // --------------------------------------------------------------------
 534
 535         if(d->do_backlog == CONFIG_BOOLEAN_YES || (d->do_backlog == CONFIG_BOOLEAN_AUTO && backlog_ms)) {
 536             d->do_backlog = CONFIG_BOOLEAN_YES;
 537
 538             if(unlikely(!d->st_backlog)) {
 539                 d->st_backlog = rrdset_create_localhost(
 540                         "disk_backlog"
 541                         , disk
 542                         , NULL
 543                         , family
 544                         , "disk.backlog"
 545                         , "Disk Backlog"
 546                         , "backlog (ms)"
 547                         , 2003
 548                         , update_every
 549                         , RRDSET_TYPE_AREA
 550                 );
 551
 552                 rrdset_flag_set(d->st_backlog, RRDSET_FLAG_DETAIL);
 553
 554                 rrddim_add(d->st_backlog, "backlog", NULL, 1, 10, RRD_ALGORITHM_INCREMENTAL);
 555             }
 556             else rrdset_next(d->st_backlog);
 557
 558             rrddim_set(d->st_backlog, "backlog", backlog_ms);
 559             rrdset_done(d->st_backlog);
 560         }
 561
 562         // --------------------------------------------------------------------
 563
 564         if(d->do_util == CONFIG_BOOLEAN_YES || (d->do_util == CONFIG_BOOLEAN_AUTO && busy_ms)) {
 565             d->do_util = CONFIG_BOOLEAN_YES;
 566
 567             if(unlikely(!d->st_util)) {
 568                 d->st_util = rrdset_create_localhost(
 569                         "disk_util"
 570                         , disk
 571                         , NULL
 572                         , family
 573                         , "disk.util"
 574                         , "Disk Utilization Time"
 575                         , "% of time working"
 576                         , 2004
 577                         , update_every
 578                         , RRDSET_TYPE_AREA
 579                 );
 580
 581                 rrdset_flag_set(d->st_util, RRDSET_FLAG_DETAIL);
 582
 583                 rrddim_add(d->st_util, "utilization", NULL, 1, 10, RRD_ALGORITHM_INCREMENTAL);
 584             }
 585             else rrdset_next(d->st_util);
 586
 587             last_busy_ms = rrddim_set(d->st_util, "utilization", busy_ms);
 588             rrdset_done(d->st_util);
 589         }
 590
 591         // --------------------------------------------------------------------
 592
 593         if(d->do_mops == CONFIG_BOOLEAN_YES || (d->do_mops == CONFIG_BOOLEAN_AUTO && (mreads || mwrites))) {
 594             d->do_mops = CONFIG_BOOLEAN_YES;
 595
 596             if(unlikely(!d->st_mops)) {
 597                 d->st_mops = rrdset_create_localhost(
 598                         "disk_mops"
 599                         , disk
 600                         , NULL
 601                         , family
 602                         , "disk.mops"
 603                         , "Disk Merged Operations"
 604                         , "merged operations/s"
 605                         , 2021
 606                         , update_every
 607                         , RRDSET_TYPE_LINE
 608                 );
 609
 610                 rrdset_flag_set(d->st_mops, RRDSET_FLAG_DETAIL);
 611
 612                 rrddim_add(d->st_mops, "reads", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
 613                 rrddim_add(d->st_mops, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
 614             }
 615             else rrdset_next(d->st_mops);
 616
 617             rrddim_set(d->st_mops, "reads", mreads);
 618             rrddim_set(d->st_mops, "writes", mwrites);
 619             rrdset_done(d->st_mops);
 620         }
 621
 622         // --------------------------------------------------------------------
 623
 624         if(d->do_iotime == CONFIG_BOOLEAN_YES || (d->do_iotime == CONFIG_BOOLEAN_AUTO && (readms || writems))) {
 625             d->do_iotime = CONFIG_BOOLEAN_YES;
 626
 627             if(unlikely(!d->st_iotime)) {
 628                 d->st_iotime = rrdset_create_localhost(
 629                         "disk_iotime"
 630                         , disk
 631                         , NULL
 632                         , family
 633                         , "disk.iotime"
 634                         , "Disk Total I/O Time"
 635                         , "milliseconds/s"
 636                         , 2022
 637                         , update_every
 638                         , RRDSET_TYPE_LINE
 639                 );
 640
 641                 rrdset_flag_set(d->st_iotime, RRDSET_FLAG_DETAIL);
 642
 643                 rrddim_add(d->st_iotime, "reads", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
 644                 rrddim_add(d->st_iotime, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
 645             }
 646             else rrdset_next(d->st_iotime);
 647
 648             last_readms  = rrddim_set(d->st_iotime, "reads", readms);
 649             last_writems = rrddim_set(d->st_iotime, "writes", writems);
 650             rrdset_done(d->st_iotime);
 651         }
 652
 653         // --------------------------------------------------------------------
 654         // calculate differential charts
 655         // only if this is not the first time we run
 656
 657         if(likely(dt)) {
 658             if( (d->do_iotime == CONFIG_BOOLEAN_YES || (d->do_iotime == CONFIG_BOOLEAN_AUTO && (readms || writems))) &&
 659                 (d->do_ops    == CONFIG_BOOLEAN_YES || (d->do_ops    == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
 660
 661                 if(unlikely(!d->st_await)) {
 662                     d->st_await = rrdset_create_localhost(
 663                             "disk_await"
 664                             , disk
 665                             , NULL
 666                             , family
 667                             , "disk.await"
 668                             , "Average Completed I/O Operation Time"
 669                             , "ms per operation"
 670                             , 2005
 671                             , update_every
 672                             , RRDSET_TYPE_LINE
 673                     );
 674
 675                     rrdset_flag_set(d->st_await, RRDSET_FLAG_DETAIL);
 676
 677                     rrddim_add(d->st_await, "reads", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
 678                     rrddim_add(d->st_await, "writes", NULL, -1, 1, RRD_ALGORITHM_ABSOLUTE);
 679                 }
 680                 else rrdset_next(d->st_await);
 681
 682                 rrddim_set(d->st_await, "reads", (reads - last_reads) ? (readms - last_readms) / (reads - last_reads) : 0);
 683                 rrddim_set(d->st_await, "writes", (writes - last_writes) ? (writems - last_writems) / (writes - last_writes) : 0);
 684                 rrdset_done(d->st_await);
 685             }
 686
 687             if( (d->do_io  == CONFIG_BOOLEAN_YES || (d->do_io  == CONFIG_BOOLEAN_AUTO && (readsectors || writesectors))) &&
 688                 (d->do_ops == CONFIG_BOOLEAN_YES || (d->do_ops == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
 689
 690                 if(unlikely(!d->st_avgsz)) {
 691                     d->st_avgsz = rrdset_create_localhost(
 692                             "disk_avgsz"
 693                             , disk
 694                             , NULL
 695                             , family
 696                             , "disk.avgsz"
 697                             , "Average Completed I/O Operation Bandwidth"
 698                             , "kilobytes per operation"
 699                             , 2006
 700                             , update_every
 701                             , RRDSET_TYPE_AREA
 702                     );
 703
 704                     rrdset_flag_set(d->st_avgsz, RRDSET_FLAG_DETAIL);
 705
 706                     rrddim_add(d->st_avgsz, "reads", NULL, d->sector_size, 1024, RRD_ALGORITHM_ABSOLUTE);
 707                     rrddim_add(d->st_avgsz, "writes", NULL, d->sector_size * -1, 1024, RRD_ALGORITHM_ABSOLUTE);
 708                 }
 709                 else rrdset_next(d->st_avgsz);
 710
 711                 rrddim_set(d->st_avgsz, "reads", (reads - last_reads) ? (readsectors - last_readsectors) / (reads - last_reads) : 0);
 712                 rrddim_set(d->st_avgsz, "writes", (writes - last_writes) ? (writesectors - last_writesectors) / (writes - last_writes) : 0);
 713                 rrdset_done(d->st_avgsz);
 714             }
 715
 716             if( (d->do_util == CONFIG_BOOLEAN_YES || (d->do_util == CONFIG_BOOLEAN_AUTO && busy_ms)) &&
 717                 (d->do_ops  == CONFIG_BOOLEAN_YES || (d->do_ops  == CONFIG_BOOLEAN_AUTO && (reads || writes)))) {
 718
 719                 if(unlikely(!d->st_svctm)) {
 720                     d->st_svctm = rrdset_create_localhost(
 721                             "disk_svctm"
 722                             , disk
 723                             , NULL
 724                             , family
 725                             , "disk.svctm"
 726                             , "Average Service Time"
 727                             , "ms per operation"
 728                             , 2007
 729                             , update_every
 730                             , RRDSET_TYPE_LINE
 731                     );
 732
 733                     rrdset_flag_set(d->st_svctm, RRDSET_FLAG_DETAIL);
 734
 735                     rrddim_add(d->st_svctm, "svctm", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
 736                 }
 737                 else rrdset_next(d->st_svctm);
 738
 739                 rrddim_set(d->st_svctm, "svctm", ((reads - last_reads) + (writes - last_writes)) ? (busy_ms - last_busy_ms) / ((reads - last_reads) + (writes - last_writes)) : 0);
 740                 rrdset_done(d->st_svctm);
 741             }
 742         }
 743     }
 744
 745     // cleanup removed disks
 746
 747     struct disk *d = disk_root, *last = NULL;
 748     while(d) {
 749         if(unlikely(!d->updated)) {
 750             struct disk *t = d;
 751
 752             rrdset_obsolete_and_pointer_null(d->st_avgsz);
 753             rrdset_obsolete_and_pointer_null(d->st_await);
 754             rrdset_obsolete_and_pointer_null(d->st_backlog);
 755             rrdset_obsolete_and_pointer_null(d->st_io);
 756             rrdset_obsolete_and_pointer_null(d->st_iotime);
 757             rrdset_obsolete_and_pointer_null(d->st_mops);
 758             rrdset_obsolete_and_pointer_null(d->st_ops);
 759             rrdset_obsolete_and_pointer_null(d->st_qops);
 760             rrdset_obsolete_and_pointer_null(d->st_svctm);
 761             rrdset_obsolete_and_pointer_null(d->st_util);
 762
 763             if(d == disk_root) {
 764                 disk_root = d = d->next;
 765                 last = NULL;
 766             }
 767             else if(last) {
 768                 last->next = d = d->next;
 769             }
 770
 771             freez(t->disk);
 772             freez(t->mount_point);
 773             freez(t);
 774         }
 775         else {
 776             d->updated = 0;
 777             last = d;
 778             d = d->next;
 779         }
 780     }
 781
 782     return 0;
 783 }