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