src/rrdset.c

   1 #define NETDATA_RRD_INTERNALS 1
   2 #include "common.h"
   3
   4 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
   5
   6 // ----------------------------------------------------------------------------
   7 // RRDSET index
   8
   9 int rrdset_compare(void* a, void* b) {
  10     if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
  11     else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
  12     else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
  13 }
  14
  15 static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
  16     RRDSET tmp;
  17     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
  18     tmp.hash = (hash)?hash:simple_hash(tmp.id);
  19
  20     return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
  21 }
  22
  23 // ----------------------------------------------------------------------------
  24 // RRDSET name index
  25
  26 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
  27
  28 int rrdset_compare_name(void* a, void* b) {
  29     RRDSET *A = rrdset_from_avlname(a);
  30     RRDSET *B = rrdset_from_avlname(b);
  31
  32     // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
  33
  34     if(A->hash_name < B->hash_name) return -1;
  35     else if(A->hash_name > B->hash_name) return 1;
  36     else return strcmp(A->name, B->name);
  37 }
  38
  39 RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
  40     void *result;
  41     // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
  42     result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
  43     if(result) return rrdset_from_avlname(result);
  44     return NULL;
  45 }
  46
  47 RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
  48     void *result;
  49     // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
  50     result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
  51     if(result) return rrdset_from_avlname(result);
  52     return NULL;
  53 }
  54
  55
  56 // ----------------------------------------------------------------------------
  57 // RRDSET - find charts
  58
  59 static inline RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
  60     void *result = NULL;
  61     RRDSET tmp;
  62     tmp.name = name;
  63     tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
  64
  65     // fprintf(stderr, "SEARCHING: %s\n", name);
  66     result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
  67     if(result) {
  68         RRDSET *st = rrdset_from_avlname(result);
  69         if(strcmp(st->magic, RRDSET_MAGIC))
  70             error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
  71
  72         // fprintf(stderr, "FOUND: %s\n", name);
  73         return rrdset_from_avlname(result);
  74     }
  75     // fprintf(stderr, "NOT FOUND: %s\n", name);
  76     return NULL;
  77 }
  78
  79 inline RRDSET *rrdset_find(RRDHOST *host, const char *id) {
  80     debug(D_RRD_CALLS, "rrdset_find() for chart '%s' in host '%s'", id, host->hostname);
  81     RRDSET *st = rrdset_index_find(host, id, 0);
  82     return(st);
  83 }
  84
  85 inline RRDSET *rrdset_find_bytype(RRDHOST *host, const char *type, const char *id) {
  86     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart '%s.%s' in host '%s'", type, id, host->hostname);
  87
  88     char buf[RRD_ID_LENGTH_MAX + 1];
  89     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
  90     strcat(buf, ".");
  91     int len = (int) strlen(buf);
  92     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
  93
  94     return(rrdset_find(host, buf));
  95 }
  96
  97 inline RRDSET *rrdset_find_byname(RRDHOST *host, const char *name) {
  98     debug(D_RRD_CALLS, "rrdset_find_byname() for chart '%s' in host '%s'", name, host->hostname);
  99     RRDSET *st = rrdset_index_find_name(host, name, 0);
 100     return(st);
 101 }
 102
 103 // ----------------------------------------------------------------------------
 104 // RRDSET - rename charts
 105
 106 char *rrdset_strncpyz_name(char *to, const char *from, size_t length) {
 107     char c, *p = to;
 108
 109     while (length-- && (c = *from++)) {
 110         if(c != '.' && !isalnum(c))
 111             c = '_';
 112
 113         *p++ = c;
 114     }
 115
 116     *p = '\0';
 117
 118     return to;
 119 }
 120
 121 void rrdset_set_name(RRDSET *st, const char *name) {
 122     if(unlikely(st->name && !strcmp(st->name, name)))
 123         return;
 124
 125     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 126
 127     char b[CONFIG_MAX_VALUE + 1];
 128     char n[RRD_ID_LENGTH_MAX + 1];
 129
 130     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 131     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 132
 133     if(st->name) {
 134         rrdset_index_del_name(st->rrdhost, st);
 135         st->name = config_set_default(st->config_section, "name", b);
 136         st->hash_name = simple_hash(st->name);
 137         rrdsetvar_rename_all(st);
 138     }
 139     else {
 140         st->name = config_get(st->config_section, "name", b);
 141         st->hash_name = simple_hash(st->name);
 142     }
 143
 144     rrdset_wrlock(st);
 145     RRDDIM *rd;
 146     for(rd = st->dimensions; rd ;rd = rd->next)
 147         rrddimvar_rename_all(rd);
 148     rrdset_unlock(st);
 149
 150     if(unlikely(rrdset_index_add_name(st->rrdhost, st) != st))
 151         error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
 152 }
 153
 154
 155 // ----------------------------------------------------------------------------
 156 // RRDSET - reset a chart
 157
 158 void rrdset_reset(RRDSET *st) {
 159     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 160
 161     st->last_collected_time.tv_sec = 0;
 162     st->last_collected_time.tv_usec = 0;
 163     st->last_updated.tv_sec = 0;
 164     st->last_updated.tv_usec = 0;
 165     st->current_entry = 0;
 166     st->counter = 0;
 167     st->counter_done = 0;
 168
 169     RRDDIM *rd;
 170     for(rd = st->dimensions; rd ; rd = rd->next) {
 171         rd->last_collected_time.tv_sec = 0;
 172         rd->last_collected_time.tv_usec = 0;
 173         rd->counter = 0;
 174         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 175     }
 176 }
 177
 178 // ----------------------------------------------------------------------------
 179 // RRDSET - helpers for rrdset_create()
 180
 181 inline long align_entries_to_pagesize(long entries) {
 182     if(central_netdata_to_push_data)
 183         return entries;
 184
 185     if(entries < 5) entries = 5;
 186     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 187
 188     long page = (size_t)sysconf(_SC_PAGESIZE);
 189     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 190     if(size % page) {
 191         size -= (size % page);
 192         size += page;
 193
 194         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 195         return n;
 196     }
 197
 198     return entries;
 199 }
 200
 201 static inline void timeval_align(struct timeval *tv, int update_every) {
 202     tv->tv_sec -= tv->tv_sec % update_every;
 203     tv->tv_usec = 500000;
 204 }
 205
 206 // ----------------------------------------------------------------------------
 207 // RRDSET - free a chart
 208
 209 void rrdset_free(RRDSET *st) {
 210     if(unlikely(!st)) return;
 211
 212     rrdhost_check_wrlock(st->rrdhost);  // make sure we have a write lock on the host
 213     rrdset_wrlock(st);                  // lock this RRDSET
 214
 215     // ------------------------------------------------------------------------
 216     // free its children structures
 217
 218     while(st->variables)  rrdsetvar_free(st->variables);
 219     while(st->alarms)     rrdsetcalc_unlink(st->alarms);
 220     while(st->dimensions) rrddim_free(st, st->dimensions);
 221
 222     rrdfamily_free(st->rrdhost, st->rrdfamily);
 223
 224     // ------------------------------------------------------------------------
 225     // remove it from the indexes
 226
 227     if(unlikely(rrdset_index_del(st->rrdhost, st) != st))
 228         error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 229
 230     rrdset_index_del_name(st->rrdhost, st);
 231
 232     // ------------------------------------------------------------------------
 233     // unlink it from the host
 234
 235     if(st == st->rrdhost->rrdset_root) {
 236         st->rrdhost->rrdset_root = st->next;
 237     }
 238     else {
 239         // find the previous one
 240         RRDSET *s;
 241         for(s = st->rrdhost->rrdset_root; s && s->next != st ; s = s->next) ;
 242
 243         // bypass it
 244         if(s) s->next = st->next;
 245         else error("Request to free RRDSET '%s': cannot find it under host '%s'", st->id, st->rrdhost->hostname);
 246     }
 247
 248     rrdset_unlock(st);
 249
 250     // ------------------------------------------------------------------------
 251     // free it
 252
 253     // free directly allocated members
 254     freez(st->config_section);
 255
 256     if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
 257         debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 258         munmap(st, st->memsize);
 259     }
 260     else
 261         freez(st);
 262 }
 263
 264 // ----------------------------------------------------------------------------
 265 // RRDSET - create a chart
 266
 267 RRDSET *rrdset_create(RRDHOST *host, const char *type, const char *id, const char *name, const char *family
 268                       , const char *context, const char *title, const char *units, long priority
 269                       , int update_every, RRDSET_TYPE chart_type) {
 270
 271     if(!type || !type[0]) {
 272         fatal("Cannot create rrd stats without a type.");
 273         return NULL;
 274     }
 275
 276     if(!id || !id[0]) {
 277         fatal("Cannot create rrd stats without an id.");
 278         return NULL;
 279     }
 280
 281     // ------------------------------------------------------------------------
 282     // check if it already exists
 283
 284     char fullid[RRD_ID_LENGTH_MAX + 1];
 285     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 286
 287     RRDSET *st = rrdset_find(host, fullid);
 288     if(st) {
 289         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 290         return st;
 291     }
 292
 293     char fullfilename[FILENAME_MAX + 1];
 294
 295     // ------------------------------------------------------------------------
 296     // compose the config_section for this chart
 297
 298     char config_section[RRD_ID_LENGTH_MAX + 1];
 299     if(host == localhost)
 300         strcpy(config_section, fullid);
 301     else
 302         snprintfz(config_section, RRD_ID_LENGTH_MAX, "%s/%s", host->machine_guid, fullid);
 303
 304     // ------------------------------------------------------------------------
 305     // get the options from the config, we need to create it
 306
 307     long rentries = config_get_number(config_section, "history", host->rrd_history_entries);
 308     long entries = align_entries_to_pagesize(rentries);
 309     if(entries != rentries) entries = config_set_number(config_section, "history", entries);
 310
 311     int enabled = config_get_boolean(config_section, "enabled", 1);
 312     if(!enabled) entries = 5;
 313
 314     unsigned long size = sizeof(RRDSET);
 315     char *cache_dir = rrdset_cache_dir(host, fullid, config_section);
 316
 317     // ------------------------------------------------------------------------
 318     // load it or allocate it
 319
 320     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 321
 322     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 323     if(host->rrd_memory_mode != RRD_MEMORY_MODE_RAM) {
 324         st = (RRDSET *) mymmap(fullfilename, size, ((host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 0);
 325         if(st) {
 326             memset(&st->avl, 0, sizeof(avl));
 327             memset(&st->avlname, 0, sizeof(avl));
 328             memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 329             memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 330             memset(&st->rrdset_rwlock, 0, sizeof(pthread_rwlock_t));
 331
 332             st->name = NULL;
 333             st->type = NULL;
 334             st->family = NULL;
 335             st->context = NULL;
 336             st->title = NULL;
 337             st->units = NULL;
 338             st->dimensions = NULL;
 339             st->next = NULL;
 340             st->variables = NULL;
 341             st->alarms = NULL;
 342             st->flags = 0x00000000;
 343
 344             if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 345                 errno = 0;
 346                 info("Initializing file %s.", fullfilename);
 347                 memset(st, 0, size);
 348             }
 349             else if(strcmp(st->id, fullid) != 0) {
 350                 errno = 0;
 351                 error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 352                 // munmap(st, size);
 353                 // st = NULL;
 354                 memset(st, 0, size);
 355             }
 356             else if(st->memsize != size || st->entries != entries) {
 357                 errno = 0;
 358                 error("File %s does not have the desired size. Clearing it.", fullfilename);
 359                 memset(st, 0, size);
 360             }
 361             else if(st->update_every != update_every) {
 362                 errno = 0;
 363                 error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 364                 memset(st, 0, size);
 365             }
 366             else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 367                 errno = 0;
 368                 error("File %s is too old. Clearing it.", fullfilename);
 369                 memset(st, 0, size);
 370             }
 371
 372             // make sure the database is aligned
 373             if(st->last_updated.tv_sec)
 374                 timeval_align(&st->last_updated, update_every);
 375
 376             // make sure we have the right memory mode
 377             // even if we cleared the memory
 378             st->rrd_memory_mode = host->rrd_memory_mode;
 379         }
 380     }
 381
 382     if(unlikely(!st)) {
 383         st = callocz(1, size);
 384         st->rrd_memory_mode = RRD_MEMORY_MODE_RAM;
 385     }
 386
 387     st->config_section = strdup(config_section);
 388     st->rrdhost = host;
 389     st->memsize = size;
 390     st->entries = entries;
 391     st->update_every = update_every;
 392
 393     if(st->current_entry >= st->entries) st->current_entry = 0;
 394
 395     strcpy(st->cache_filename, fullfilename);
 396     strcpy(st->magic, RRDSET_MAGIC);
 397
 398     strcpy(st->id, fullid);
 399     st->hash = simple_hash(st->id);
 400
 401     st->cache_dir = cache_dir;
 402
 403     st->chart_type = rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
 404     st->type       = config_get(st->config_section, "type", type);
 405     st->family     = config_get(st->config_section, "family", family?family:st->type);
 406     st->units      = config_get(st->config_section, "units", units?units:"");
 407
 408     st->context    = config_get(st->config_section, "context", context?context:st->id);
 409     st->hash_context = simple_hash(st->context);
 410
 411     st->priority = config_get_number(st->config_section, "priority", priority);
 412     if(enabled)
 413         rrdset_flag_set(st, RRDSET_FLAG_ENABLED);
 414     else
 415         rrdset_flag_clear(st, RRDSET_FLAG_ENABLED);
 416
 417     rrdset_flag_clear(st, RRDSET_FLAG_DETAIL);
 418     rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
 419
 420     // if(!strcmp(st->id, "disk_util.dm-0")) {
 421     //     st->debug = 1;
 422     //     error("enabled debugging for '%s'", st->id);
 423     // }
 424     // else error("not enabled debugging for '%s'", st->id);
 425
 426     st->green = NAN;
 427     st->red = NAN;
 428
 429     st->last_collected_time.tv_sec = 0;
 430     st->last_collected_time.tv_usec = 0;
 431     st->counter_done = 0;
 432
 433     st->gap_when_lost_iterations_above = (int) (
 434             config_get_number(st->config_section, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 435
 436     avl_init_lock(&st->dimensions_index, rrddim_compare);
 437     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 438
 439     pthread_rwlock_init(&st->rrdset_rwlock, NULL);
 440     rrdhost_wrlock(host);
 441
 442     if(name && *name) rrdset_set_name(st, name);
 443     else rrdset_set_name(st, id);
 444
 445     {
 446         char varvalue[CONFIG_MAX_VALUE + 1];
 447         char varvalue2[CONFIG_MAX_VALUE + 1];
 448         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 449         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 450         st->title = config_get(st->config_section, "title", varvalue2);
 451     }
 452
 453     st->rrdfamily = rrdfamily_create(host, st->family);
 454
 455     st->next = host->rrdset_root;
 456     host->rrdset_root = st;
 457
 458     if(host->health_enabled) {
 459         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 460         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 461         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 462         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 463         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 464     }
 465
 466     if(unlikely(rrdset_index_add(host, st) != st))
 467         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 468
 469     rrdsetcalc_link_matching(st);
 470     rrdcalctemplate_link_matching(st);
 471
 472     rrdhost_unlock(host);
 473
 474     return(st);
 475 }
 476
 477
 478 // ----------------------------------------------------------------------------
 479 // RRDSET - data collection iteration control
 480
 481 void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds) {
 482     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
 483         // the first entry
 484         microseconds = st->update_every * USEC_PER_SEC;
 485     }
 486     st->usec_since_last_update = microseconds;
 487 }
 488
 489 void rrdset_next_usec(RRDSET *st, usec_t microseconds)
 490 {
 491     struct timeval now;
 492     now_realtime_timeval(&now);
 493
 494     if(unlikely(!st->last_collected_time.tv_sec)) {
 495         // the first entry
 496         microseconds = st->update_every * USEC_PER_SEC;
 497     }
 498     else if(unlikely(!microseconds)) {
 499         // no dt given by the plugin
 500         microseconds = dt_usec(&now, &st->last_collected_time);
 501     }
 502     else {
 503         // microseconds has the time since the last collection
 504 //#ifdef NETDATA_INTERNAL_CHECKS
 505 //        usec_t now_usec = timeval_usec(&now);
 506 //        usec_t last_usec = timeval_usec(&st->last_collected_time);
 507 //#endif
 508         usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
 509
 510         // verify the microseconds given is good
 511         if(unlikely(microseconds > since_last_usec)) {
 512             debug(D_RRD_CALLS, "dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
 513
 514 //#ifdef NETDATA_INTERNAL_CHECKS
 515 //            if(unlikely(last_usec + microseconds > now_usec + 1000))
 516 //                error("dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
 517 //#endif
 518
 519             microseconds = since_last_usec;
 520         }
 521         else if(unlikely(microseconds < since_last_usec * 0.8)) {
 522             debug(D_RRD_CALLS, "dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
 523
 524 //#ifdef NETDATA_INTERNAL_CHECKS
 525 //            error("dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
 526 //#endif
 527             microseconds = since_last_usec;
 528         }
 529     }
 530     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 531
 532     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 533         debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 534
 535     st->usec_since_last_update = microseconds;
 536 }
 537
 538
 539 // ----------------------------------------------------------------------------
 540 // RRDSET - process the collected values for all dimensions of a chart
 541
 542 void rrdset_done(RRDSET *st) {
 543     if(unlikely(netdata_exit)) return;
 544     if(unlikely(central_netdata_to_push_data)) {
 545         rrdset_done_push(st);
 546         return;
 547     }
 548
 549     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 550
 551     RRDDIM *rd;
 552
 553     int
 554             pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
 555
 556     char
 557             store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
 558             first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
 559
 560     unsigned int
 561             stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
 562
 563     usec_t
 564             last_collect_ut,        // the timestamp in microseconds, of the last collected value
 565             now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
 566             last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
 567             next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
 568             update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
 569
 570     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 571         error("Cannot set pthread cancel state to DISABLE.");
 572
 573     // a read lock is OK here
 574     rrdset_rdlock(st);
 575
 576 /*
 577     // enable the chart, if it was disabled
 578     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 579         st->enabled = 1;
 580 */
 581
 582     // check if the chart has a long time to be updated
 583     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
 584         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 585         rrdset_reset(st);
 586         st->usec_since_last_update = update_every_ut;
 587         first_entry = 1;
 588     }
 589
 590     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 591         debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 592
 593     // set last_collected_time
 594     if(unlikely(!st->last_collected_time.tv_sec)) {
 595         // it is the first entry
 596         // set the last_collected_time to now
 597         now_realtime_timeval(&st->last_collected_time);
 598         timeval_align(&st->last_collected_time, st->update_every);
 599
 600         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
 601
 602         // the first entry should not be stored
 603         store_this_entry = 0;
 604         first_entry = 1;
 605
 606         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 607             debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
 608     }
 609     else {
 610         // it is not the first entry
 611         // calculate the proper last_collected_time, using usec_since_last_update
 612         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 613         usec_t ut = last_collect_ut + st->usec_since_last_update;
 614         st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
 615         st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 616     }
 617
 618     // if this set has not been updated in the past
 619     // we fake the last_update time to be = now - usec_since_last_update
 620     if(unlikely(!st->last_updated.tv_sec)) {
 621         // it has never been updated before
 622         // set a fake last_updated, in the past using usec_since_last_update
 623         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
 624         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
 625         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 626
 627         // the first entry should not be stored
 628         store_this_entry = 0;
 629         first_entry = 1;
 630
 631         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 632             debug(D_RRD_STATS, "%s: initializing last_updated to now - %llu microseconds (%0.3Lf). Will not store the next entry.", st->name, st->usec_since_last_update, (long double)ut/1000000.0);
 633     }
 634
 635     // check if we will re-write the entire data set
 636     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
 637         info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Resetting it. Will not store the next entry.", st->name, st->last_updated.tv_sec, st->last_updated.tv_usec, st->last_collected_time.tv_sec, st->last_collected_time.tv_usec);
 638         rrdset_reset(st);
 639
 640         st->usec_since_last_update = update_every_ut;
 641
 642         now_realtime_timeval(&st->last_collected_time);
 643         timeval_align(&st->last_collected_time, st->update_every);
 644
 645         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
 646         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
 647         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 648
 649         // the first entry should not be stored
 650         store_this_entry = 0;
 651         first_entry = 1;
 652     }
 653
 654     // these are the 3 variables that will help us in interpolation
 655     // last_stored_ut = the last time we added a value to the storage
 656     // now_collect_ut = the time the current value has been collected
 657     // next_store_ut  = the time of the next interpolation point
 658     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
 659     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 660     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
 661
 662     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 663         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
 664         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
 665         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 666         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 667     }
 668
 669     if(unlikely(!st->counter_done)) {
 670         store_this_entry = 0;
 671         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 672             debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
 673     }
 674     st->counter_done++;
 675
 676     // calculate totals and count the dimensions
 677     int dimensions;
 678     st->collected_total = 0;
 679     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
 680         if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
 681             st->collected_total += rd->collected_value;
 682
 683     uint32_t storage_flags = SN_EXISTS;
 684
 685     // process all dimensions to calculate their values
 686     // based on the collected figures only
 687     // at this stage we do not interpolate anything
 688     for( rd = st->dimensions ; rd ; rd = rd->next ) {
 689
 690         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED))) {
 691             rd->calculated_value = 0;
 692             continue;
 693         }
 694
 695         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 696             debug(D_RRD_STATS, "%s/%s: START "
 697                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 698                     " collected_value = " COLLECTED_NUMBER_FORMAT
 699                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 700                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 701                                       , st->id, rd->name
 702                                       , rd->last_collected_value
 703                                       , rd->collected_value
 704                                       , rd->last_calculated_value
 705                                       , rd->calculated_value
 706             );
 707
 708         switch(rd->algorithm) {
 709             case RRD_ALGORITHM_ABSOLUTE:
 710                 rd->calculated_value = (calculated_number)rd->collected_value
 711                                        * (calculated_number)rd->multiplier
 712                                        / (calculated_number)rd->divisor;
 713
 714                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 715                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
 716                             CALCULATED_NUMBER_FORMAT " = "
 717                             COLLECTED_NUMBER_FORMAT
 718                             " * " CALCULATED_NUMBER_FORMAT
 719                             " / " CALCULATED_NUMBER_FORMAT
 720                           , st->id, rd->name
 721                           , rd->calculated_value
 722                           , rd->collected_value
 723                           , (calculated_number)rd->multiplier
 724                           , (calculated_number)rd->divisor
 725                     );
 726                 break;
 727
 728             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 729                 if(unlikely(!st->collected_total))
 730                     rd->calculated_value = 0;
 731                 else
 732                     // the percentage of the current value
 733                     // over the total of all dimensions
 734                     rd->calculated_value =
 735                             (calculated_number)100
 736                             * (calculated_number)rd->collected_value
 737                             / (calculated_number)st->collected_total;
 738
 739                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 740                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
 741                             CALCULATED_NUMBER_FORMAT " = 100"
 742                                     " * " COLLECTED_NUMBER_FORMAT
 743                             " / " COLLECTED_NUMBER_FORMAT
 744                           , st->id, rd->name
 745                           , rd->calculated_value
 746                           , rd->collected_value
 747                           , st->collected_total
 748                     );
 749                 break;
 750
 751             case RRD_ALGORITHM_INCREMENTAL:
 752                 if(unlikely(rd->counter <= 1)) {
 753                     rd->calculated_value = 0;
 754                     continue;
 755                 }
 756
 757                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 758                 // to reset the calculation (it will give zero as the calculation for this second)
 759                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 760                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 761                           , st->name, rd->name
 762                           , rd->last_collected_value
 763                           , rd->collected_value);
 764
 765                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 766                         storage_flags = SN_EXISTS_RESET;
 767
 768                     rd->last_collected_value = rd->collected_value;
 769                 }
 770
 771                 rd->calculated_value +=
 772                         (calculated_number)(rd->collected_value - rd->last_collected_value)
 773                         * (calculated_number)rd->multiplier
 774                         / (calculated_number)rd->divisor;
 775
 776                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 777                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
 778                             CALCULATED_NUMBER_FORMAT " = ("
 779                             COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
 780                             ")"
 781                                     " * " CALCULATED_NUMBER_FORMAT
 782                             " / " CALCULATED_NUMBER_FORMAT
 783                           , st->id, rd->name
 784                           , rd->calculated_value
 785                           , rd->collected_value, rd->last_collected_value
 786                           , (calculated_number)rd->multiplier
 787                           , (calculated_number)rd->divisor
 788                     );
 789                 break;
 790
 791             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 792                 if(unlikely(rd->counter <= 1)) {
 793                     rd->calculated_value = 0;
 794                     continue;
 795                 }
 796
 797                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 798                 // to reset the calculation (it will give zero as the calculation for this second)
 799                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 800                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 801                           , st->name, rd->name
 802                           , rd->last_collected_value
 803                           , rd->collected_value);
 804
 805                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 806                         storage_flags = SN_EXISTS_RESET;
 807
 808                     rd->last_collected_value = rd->collected_value;
 809                 }
 810
 811                 // the percentage of the current increment
 812                 // over the increment of all dimensions together
 813                 if(unlikely(st->collected_total == st->last_collected_total))
 814                     rd->calculated_value = 0;
 815                 else
 816                     rd->calculated_value =
 817                             (calculated_number)100
 818                             * (calculated_number)(rd->collected_value - rd->last_collected_value)
 819                             / (calculated_number)(st->collected_total - st->last_collected_total);
 820
 821                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 822                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
 823                             CALCULATED_NUMBER_FORMAT " = 100"
 824                                     " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 825                                     " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 826                           , st->id, rd->name
 827                           , rd->calculated_value
 828                           , rd->collected_value, rd->last_collected_value
 829                           , st->collected_total, st->last_collected_total
 830                     );
 831                 break;
 832
 833             default:
 834                 // make the default zero, to make sure
 835                 // it gets noticed when we add new types
 836                 rd->calculated_value = 0;
 837
 838                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 839                     debug(D_RRD_STATS, "%s/%s: CALC "
 840                             CALCULATED_NUMBER_FORMAT " = 0"
 841                           , st->id, rd->name
 842                           , rd->calculated_value
 843                     );
 844                 break;
 845         }
 846
 847         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 848             debug(D_RRD_STATS, "%s/%s: PHASE2 "
 849                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 850                     " collected_value = " COLLECTED_NUMBER_FORMAT
 851                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 852                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 853                                       , st->id, rd->name
 854                                       , rd->last_collected_value
 855                                       , rd->collected_value
 856                                       , rd->last_calculated_value
 857                                       , rd->calculated_value
 858             );
 859
 860     }
 861
 862     // at this point we have all the calculated values ready
 863     // it is now time to interpolate values on a second boundary
 864
 865     if(unlikely(now_collect_ut < next_store_ut)) {
 866         // this is collected in the same interpolation point
 867
 868         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 869             debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
 870
 871 //#ifdef NETDATA_INTERNAL_CHECKS
 872 //        info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
 873 //#endif
 874     }
 875
 876     usec_t first_ut = last_stored_ut;
 877     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
 878     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
 879
 880     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
 881 //#ifdef NETDATA_INTERNAL_CHECKS
 882 //        if(iterations < 0) { error("%s: iterations calculation wrapped! first_ut = %llu, last_stored_ut = %llu, next_store_ut = %llu, now_collect_ut = %llu", st->name, first_ut, last_stored_ut, next_store_ut, now_collect_ut); }
 883 //#endif
 884
 885         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 886             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 887             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 888         }
 889
 890         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
 891         st->last_updated.tv_usec = 0;
 892
 893         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
 894             calculated_number new_value;
 895
 896             switch(rd->algorithm) {
 897                 case RRD_ALGORITHM_INCREMENTAL:
 898                     new_value = (calculated_number)
 899                             (      rd->calculated_value
 900                                    * (calculated_number)(next_store_ut - last_collect_ut)
 901                                    / (calculated_number)(now_collect_ut - last_collect_ut)
 902                             );
 903
 904                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 905                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
 906                                 CALCULATED_NUMBER_FORMAT " = "
 907                                 CALCULATED_NUMBER_FORMAT
 908                                 " * %llu"
 909                                         " / %llu"
 910                               , st->id, rd->name
 911                               , new_value
 912                               , rd->calculated_value
 913                               , (next_store_ut - last_stored_ut)
 914                               , (now_collect_ut - last_stored_ut)
 915                         );
 916
 917                     rd->calculated_value -= new_value;
 918                     new_value += rd->last_calculated_value;
 919                     rd->last_calculated_value = 0;
 920                     new_value /= (calculated_number)st->update_every;
 921
 922                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
 923                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 924                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
 925                                     st->id, rd->name
 926                                   , (calculated_number)(next_store_ut - last_stored_ut)
 927                             );
 928                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
 929                     }
 930                     break;
 931
 932                 case RRD_ALGORITHM_ABSOLUTE:
 933                 case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 934                 case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 935                 default:
 936                     if(iterations == 1) {
 937                         // this is the last iteration
 938                         // do not interpolate
 939                         // just show the calculated value
 940
 941                         new_value = rd->calculated_value;
 942                     }
 943                     else {
 944                         // we have missed an update
 945                         // interpolate in the middle values
 946
 947                         new_value = (calculated_number)
 948                                 (   (     (rd->calculated_value - rd->last_calculated_value)
 949                                           * (calculated_number)(next_store_ut - last_collect_ut)
 950                                           / (calculated_number)(now_collect_ut - last_collect_ut)
 951                                     )
 952                                     +  rd->last_calculated_value
 953                                 );
 954
 955                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 956                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
 957                                     CALCULATED_NUMBER_FORMAT " = ((("
 958                                             "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
 959                                             " * %llu"
 960                                             " / %llu) + " CALCULATED_NUMBER_FORMAT
 961                                   , st->id, rd->name
 962                                   , new_value
 963                                   , rd->calculated_value, rd->last_calculated_value
 964                                   , (next_store_ut - first_ut)
 965                                   , (now_collect_ut - first_ut), rd->last_calculated_value
 966                             );
 967                     }
 968                     break;
 969             }
 970
 971             if(unlikely(!store_this_entry)) {
 972                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 973                 continue;
 974             }
 975
 976             if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED) && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
 977                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
 978                 rd->last_stored_value = new_value;
 979
 980                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 981                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
 982                             CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
 983                           , st->id, rd->name
 984                           , st->current_entry
 985                           , unpack_storage_number(rd->values[st->current_entry]), new_value
 986                     );
 987             }
 988             else {
 989                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 990                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
 991                           , st->id, rd->name
 992                           , st->current_entry
 993                     );
 994                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 995                 rd->last_stored_value = NAN;
 996             }
 997
 998             stored_entries++;
 999
1000             if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1001                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1002                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1003                 calculated_number accuracy = accuracy_loss(t1, t2);
1004                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1005                       , st->id, rd->name
1006                       , st->current_entry
1007                       , t2
1008                       , get_storage_number_flags(rd->values[st->current_entry])
1009                       , t1
1010                       , accuracy
1011                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1012                 );
1013
1014                 rd->collected_volume += t1;
1015                 rd->stored_volume += t2;
1016                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1017                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1018                       , st->id, rd->name
1019                       , st->current_entry
1020                       , rd->stored_volume
1021                       , rd->collected_volume
1022                       , accuracy
1023                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1024                 );
1025
1026             }
1027         }
1028         // reset the storage flags for the next point, if any;
1029         storage_flags = SN_EXISTS;
1030
1031         st->counter++;
1032         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1033         last_stored_ut = next_store_ut;
1034     }
1035
1036     st->last_collected_total  = st->collected_total;
1037
1038     for( rd = st->dimensions; rd ; rd = rd->next ) {
1039         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
1040             continue;
1041
1042         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1043             debug(D_RRD_STATS, "%s/%s: setting last_collected_value (old: " COLLECTED_NUMBER_FORMAT ") to last_collected_value (new: " COLLECTED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_collected_value, rd->collected_value);
1044
1045         rd->last_collected_value = rd->collected_value;
1046
1047         switch(rd->algorithm) {
1048             case RRD_ALGORITHM_INCREMENTAL:
1049                 if(unlikely(!first_entry)) {
1050                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1051                         debug(D_RRD_STATS, "%s/%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_calculated_value + rd->calculated_value, rd->calculated_value);
1052                     rd->last_calculated_value += rd->calculated_value;
1053                 }
1054                 else {
1055                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1056                         debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1057                 }
1058                 break;
1059
1060             case RRD_ALGORITHM_ABSOLUTE:
1061             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1062             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1063                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1064                     debug(D_RRD_STATS, "%s/%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_calculated_value, rd->calculated_value);
1065                 rd->last_calculated_value = rd->calculated_value;
1066                 break;
1067         }
1068
1069         rd->calculated_value = 0;
1070         rd->collected_value = 0;
1071         rrddim_flag_clear(rd, RRDDIM_FLAG_UPDATED);
1072
1073         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1074             debug(D_RRD_STATS, "%s/%s: END "
1075                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
1076                     " collected_value = " COLLECTED_NUMBER_FORMAT
1077                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1078                     " calculated_value = " CALCULATED_NUMBER_FORMAT
1079                                       , st->id, rd->name
1080                                       , rd->last_collected_value
1081                                       , rd->collected_value
1082                                       , rd->last_calculated_value
1083                                       , rd->calculated_value
1084             );
1085     }
1086
1087     // ALL DONE ABOUT THE DATA UPDATE
1088     // --------------------------------------------------------------------
1089
1090 /*
1091     // find if there are any obsolete dimensions (not updated recently)
1092     if(unlikely(rrd_delete_unupdated_dimensions)) {
1093
1094         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1095             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1096                 break;
1097
1098         if(unlikely(rd)) {
1099             RRDDIM *last;
1100             // there is dimension to free
1101             // upgrade our read lock to a write lock
1102             pthread_rwlock_unlock(&st->rrdset_rwlock);
1103             pthread_rwlock_wrlock(&st->rrdset_rwlock);
1104
1105             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1106                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1107
1108                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1109                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1110
1111                     if(unlikely(!last)) {
1112                         st->dimensions = rd->next;
1113                         rd->next = NULL;
1114                         rrddim_free(st, rd);
1115                         rd = st->dimensions;
1116                         continue;
1117                     }
1118                     else {
1119                         last->next = rd->next;
1120                         rd->next = NULL;
1121                         rrddim_free(st, rd);
1122                         rd = last->next;
1123                         continue;
1124                     }
1125                 }
1126
1127                 last = rd;
1128                 rd = rd->next;
1129             }
1130
1131             if(unlikely(!st->dimensions)) {
1132                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1133                 st->enabled = 0;
1134             }
1135         }
1136     }
1137 */
1138
1139     rrdset_unlock(st);
1140
1141     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1142         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1143 }
1144