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