src/rrdset.c

   1 #define NETDATA_RRD_INTERNALS 1
   2 #include "common.h"
   3
   4 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
   5
   6 void rrdset_check_rdlock_int(RRDSET *st, const char *file, const char *function, const unsigned long line) {
   7     debug(D_RRD_CALLS, "Checking read lock on chart '%s'", st->id);
   8
   9     int ret = pthread_rwlock_trywrlock(&st->rrdset_rwlock);
  10     if(ret == 0)
  11         fatal("RRDSET '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", st->id, function, line, file);
  12 }
  13
  14 void rrdset_check_wrlock_int(RRDSET *st, const char *file, const char *function, const unsigned long line) {
  15     debug(D_RRD_CALLS, "Checking write lock on chart '%s'", st->id);
  16
  17     int ret = pthread_rwlock_tryrdlock(&st->rrdset_rwlock);
  18     if(ret == 0)
  19         fatal("RRDSET '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", st->id, function, line, file);
  20 }
  21
  22
  23 // ----------------------------------------------------------------------------
  24 // RRDSET index
  25
  26 int rrdset_compare(void* a, void* b) {
  27     if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
  28     else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
  29     else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
  30 }
  31
  32 static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
  33     RRDSET tmp;
  34     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
  35     tmp.hash = (hash)?hash:simple_hash(tmp.id);
  36
  37     return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
  38 }
  39
  40 // ----------------------------------------------------------------------------
  41 // RRDSET name index
  42
  43 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
  44
  45 int rrdset_compare_name(void* a, void* b) {
  46     RRDSET *A = rrdset_from_avlname(a);
  47     RRDSET *B = rrdset_from_avlname(b);
  48
  49     // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
  50
  51     if(A->hash_name < B->hash_name) return -1;
  52     else if(A->hash_name > B->hash_name) return 1;
  53     else return strcmp(A->name, B->name);
  54 }
  55
  56 RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
  57     void *result;
  58     // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
  59     result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
  60     if(result) return rrdset_from_avlname(result);
  61     return NULL;
  62 }
  63
  64 RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
  65     void *result;
  66     // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
  67     result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
  68     if(result) return rrdset_from_avlname(result);
  69     return NULL;
  70 }
  71
  72
  73 // ----------------------------------------------------------------------------
  74 // RRDSET - find charts
  75
  76 static inline RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
  77     void *result = NULL;
  78     RRDSET tmp;
  79     tmp.name = name;
  80     tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
  81
  82     // fprintf(stderr, "SEARCHING: %s\n", name);
  83     result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
  84     if(result) {
  85         RRDSET *st = rrdset_from_avlname(result);
  86         if(strcmp(st->magic, RRDSET_MAGIC))
  87             error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
  88
  89         // fprintf(stderr, "FOUND: %s\n", name);
  90         return rrdset_from_avlname(result);
  91     }
  92     // fprintf(stderr, "NOT FOUND: %s\n", name);
  93     return NULL;
  94 }
  95
  96 inline RRDSET *rrdset_find(RRDHOST *host, const char *id) {
  97     debug(D_RRD_CALLS, "rrdset_find() for chart '%s' in host '%s'", id, host->hostname);
  98     RRDSET *st = rrdset_index_find(host, id, 0);
  99     return(st);
 100 }
 101
 102 inline RRDSET *rrdset_find_bytype(RRDHOST *host, const char *type, const char *id) {
 103     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart '%s.%s' in host '%s'", type, id, host->hostname);
 104
 105     char buf[RRD_ID_LENGTH_MAX + 1];
 106     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 107     strcat(buf, ".");
 108     int len = (int) strlen(buf);
 109     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 110
 111     return(rrdset_find(host, buf));
 112 }
 113
 114 inline RRDSET *rrdset_find_byname(RRDHOST *host, const char *name) {
 115     debug(D_RRD_CALLS, "rrdset_find_byname() for chart '%s' in host '%s'", name, host->hostname);
 116     RRDSET *st = rrdset_index_find_name(host, name, 0);
 117     return(st);
 118 }
 119
 120 // ----------------------------------------------------------------------------
 121 // RRDSET - rename charts
 122
 123 char *rrdset_strncpyz_name(char *to, const char *from, size_t length) {
 124     char c, *p = to;
 125
 126     while (length-- && (c = *from++)) {
 127         if(c != '.' && !isalnum(c))
 128             c = '_';
 129
 130         *p++ = c;
 131     }
 132
 133     *p = '\0';
 134
 135     return to;
 136 }
 137
 138 void rrdset_set_name(RRDSET *st, const char *name) {
 139     if(unlikely(st->name && !strcmp(st->name, name)))
 140         return;
 141
 142     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 143
 144     char b[CONFIG_MAX_VALUE + 1];
 145     char n[RRD_ID_LENGTH_MAX + 1];
 146
 147     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 148     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 149
 150     if(st->name) {
 151         rrdset_index_del_name(st->rrdhost, st);
 152         st->name = config_set_default(st->config_section, "name", b);
 153         st->hash_name = simple_hash(st->name);
 154         rrdsetvar_rename_all(st);
 155     }
 156     else {
 157         st->name = config_get(st->config_section, "name", b);
 158         st->hash_name = simple_hash(st->name);
 159     }
 160
 161     rrdset_wrlock(st);
 162     RRDDIM *rd;
 163     rrddim_foreach_write(rd, st)
 164         rrddimvar_rename_all(rd);
 165     rrdset_unlock(st);
 166
 167     if(unlikely(rrdset_index_add_name(st->rrdhost, st) != st))
 168         error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
 169 }
 170
 171
 172 // ----------------------------------------------------------------------------
 173 // RRDSET - reset a chart
 174
 175 void rrdset_reset(RRDSET *st) {
 176     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 177
 178     st->last_collected_time.tv_sec = 0;
 179     st->last_collected_time.tv_usec = 0;
 180     st->last_updated.tv_sec = 0;
 181     st->last_updated.tv_usec = 0;
 182     st->current_entry = 0;
 183     st->counter = 0;
 184     st->counter_done = 0;
 185
 186     RRDDIM *rd;
 187     rrddim_foreach_read(rd, st) {
 188         rd->last_collected_time.tv_sec = 0;
 189         rd->last_collected_time.tv_usec = 0;
 190         rd->collections_counter = 0;
 191         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 192     }
 193 }
 194
 195 // ----------------------------------------------------------------------------
 196 // RRDSET - helpers for rrdset_create()
 197
 198 inline long align_entries_to_pagesize(RRD_MEMORY_MODE mode, long entries) {
 199     if(unlikely(entries < 5)) entries = 5;
 200     if(unlikely(entries > RRD_HISTORY_ENTRIES_MAX)) entries = RRD_HISTORY_ENTRIES_MAX;
 201
 202     if(unlikely(mode == RRD_MEMORY_MODE_NONE || mode == RRD_MEMORY_MODE_RAM))
 203         return entries;
 204
 205     long page = (size_t)sysconf(_SC_PAGESIZE);
 206     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 207     if(unlikely(size % page)) {
 208         size -= (size % page);
 209         size += page;
 210
 211         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 212         return n;
 213     }
 214
 215     return entries;
 216 }
 217
 218 static inline void last_collected_time_align(struct timeval *tv, int update_every) {
 219     tv->tv_sec -= tv->tv_sec % update_every;
 220     tv->tv_usec = 500000;
 221 }
 222
 223 static inline void last_updated_time_align(struct timeval *tv, int update_every) {
 224     tv->tv_sec -= tv->tv_sec % update_every;
 225     tv->tv_usec = 0;
 226 }
 227
 228 // ----------------------------------------------------------------------------
 229 // RRDSET - free a chart
 230
 231 void rrdset_free(RRDSET *st) {
 232     if(unlikely(!st)) return;
 233
 234     rrdhost_check_wrlock(st->rrdhost);  // make sure we have a write lock on the host
 235     rrdset_wrlock(st);                  // lock this RRDSET
 236
 237     // info("Removing chart '%s' ('%s')", st->id, st->name);
 238
 239     // ------------------------------------------------------------------------
 240     // remove it from the indexes
 241
 242     if(unlikely(rrdset_index_del(st->rrdhost, st) != st))
 243         error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 244
 245     rrdset_index_del_name(st->rrdhost, st);
 246
 247     // ------------------------------------------------------------------------
 248     // free its children structures
 249
 250     while(st->variables)  rrdsetvar_free(st->variables);
 251     while(st->alarms)     rrdsetcalc_unlink(st->alarms);
 252     while(st->dimensions) rrddim_free(st, st->dimensions);
 253
 254     rrdfamily_free(st->rrdhost, st->rrdfamily);
 255
 256     // ------------------------------------------------------------------------
 257     // unlink it from the host
 258
 259     if(st == st->rrdhost->rrdset_root) {
 260         st->rrdhost->rrdset_root = st->next;
 261     }
 262     else {
 263         // find the previous one
 264         RRDSET *s;
 265         for(s = st->rrdhost->rrdset_root; s && s->next != st ; s = s->next) ;
 266
 267         // bypass it
 268         if(s) s->next = st->next;
 269         else error("Request to free RRDSET '%s': cannot find it under host '%s'", st->id, st->rrdhost->hostname);
 270     }
 271
 272     rrdset_unlock(st);
 273
 274     // ------------------------------------------------------------------------
 275     // free it
 276
 277     // free directly allocated members
 278     freez(st->config_section);
 279
 280     if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
 281         debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 282         munmap(st, st->memsize);
 283     }
 284     else
 285         freez(st);
 286 }
 287
 288 void rrdset_save(RRDSET *st) {
 289     RRDDIM *rd;
 290
 291     rrdset_check_rdlock(st);
 292
 293     // info("Saving chart '%s' ('%s')", st->id, st->name);
 294
 295     if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 296         debug(D_RRD_STATS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 297         savememory(st->cache_filename, st, st->memsize);
 298     }
 299
 300     rrddim_foreach_read(rd, st) {
 301         if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
 302             debug(D_RRD_STATS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 303             savememory(rd->cache_filename, rd, rd->memsize);
 304         }
 305     }
 306 }
 307
 308 // ----------------------------------------------------------------------------
 309 // RRDSET - create a chart
 310
 311 RRDSET *rrdset_create(
 312           RRDHOST *host
 313         , const char *type
 314         , const char *id
 315         , const char *name
 316         , const char *family
 317         , const char *context
 318         , const char *title
 319         , const char *units
 320         , long priority
 321         , int update_every
 322         , RRDSET_TYPE chart_type
 323 ) {
 324     if(!type || !type[0]) {
 325         fatal("Cannot create rrd stats without a type.");
 326         return NULL;
 327     }
 328
 329     if(!id || !id[0]) {
 330         fatal("Cannot create rrd stats without an id.");
 331         return NULL;
 332     }
 333
 334     // ------------------------------------------------------------------------
 335     // check if it already exists
 336
 337     char fullid[RRD_ID_LENGTH_MAX + 1];
 338     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 339
 340     RRDSET *st = rrdset_find(host, fullid);
 341     if(st) {
 342         rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 343         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 344         return st;
 345     }
 346
 347     char fullfilename[FILENAME_MAX + 1];
 348
 349     // ------------------------------------------------------------------------
 350     // compose the config_section for this chart
 351
 352     char config_section[RRD_ID_LENGTH_MAX + 1];
 353     if(host == localhost)
 354         strcpy(config_section, fullid);
 355     else
 356         snprintfz(config_section, RRD_ID_LENGTH_MAX, "%s/%s", host->machine_guid, fullid);
 357
 358     // ------------------------------------------------------------------------
 359     // get the options from the config, we need to create it
 360
 361     long rentries = config_get_number(config_section, "history", host->rrd_history_entries);
 362     long entries = align_entries_to_pagesize(host->rrd_memory_mode, rentries);
 363     if(entries != rentries) entries = config_set_number(config_section, "history", entries);
 364
 365     if(host->rrd_memory_mode == RRD_MEMORY_MODE_NONE && entries != rentries)
 366         entries = config_set_number(config_section, "history", 10);
 367
 368     int enabled = config_get_boolean(config_section, "enabled", 1);
 369     if(!enabled) entries = 5;
 370
 371     unsigned long size = sizeof(RRDSET);
 372     char *cache_dir = rrdset_cache_dir(host, fullid, config_section);
 373
 374     time_t now = now_realtime_sec();
 375
 376     // ------------------------------------------------------------------------
 377     // load it or allocate it
 378
 379     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 380
 381     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 382     if(host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
 383         st = (RRDSET *) mymmap(fullfilename, size, ((host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 0);
 384         if(st) {
 385             memset(&st->avl, 0, sizeof(avl));
 386             memset(&st->avlname, 0, sizeof(avl));
 387             memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 388             memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 389             memset(&st->rrdset_rwlock, 0, sizeof(pthread_rwlock_t));
 390
 391             st->name = NULL;
 392             st->type = NULL;
 393             st->family = NULL;
 394             st->context = NULL;
 395             st->title = NULL;
 396             st->units = NULL;
 397             st->dimensions = NULL;
 398             st->next = NULL;
 399             st->variables = NULL;
 400             st->alarms = NULL;
 401             st->flags = 0x00000000;
 402
 403             if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 404                 errno = 0;
 405                 info("Initializing file %s.", fullfilename);
 406                 memset(st, 0, size);
 407             }
 408             else if(strcmp(st->id, fullid) != 0) {
 409                 errno = 0;
 410                 error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 411                 // munmap(st, size);
 412                 // st = NULL;
 413                 memset(st, 0, size);
 414             }
 415             else if(st->memsize != size || st->entries != entries) {
 416                 errno = 0;
 417                 error("File %s does not have the desired size. Clearing it.", fullfilename);
 418                 memset(st, 0, size);
 419             }
 420             else if(st->update_every != update_every) {
 421                 errno = 0;
 422                 error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 423                 memset(st, 0, size);
 424             }
 425             else if((now - st->last_updated.tv_sec) > update_every * entries) {
 426                 errno = 0;
 427                 error("File %s is too old. Clearing it.", fullfilename);
 428                 memset(st, 0, size);
 429             }
 430             else if(st->last_updated.tv_sec > now + update_every) {
 431                 errno = 0;
 432                 error("File %s refers to the future. Clearing it.", fullfilename);
 433                 memset(st, 0, size);
 434             }
 435
 436             // make sure the database is aligned
 437             if(st->last_updated.tv_sec)
 438                 last_updated_time_align(&st->last_updated, update_every);
 439
 440
 441             // make sure we have the right memory mode
 442             // even if we cleared the memory
 443             st->rrd_memory_mode = host->rrd_memory_mode;
 444         }
 445     }
 446
 447     if(unlikely(!st)) {
 448         st = callocz(1, size);
 449         st->rrd_memory_mode = (host->rrd_memory_mode == RRD_MEMORY_MODE_NONE) ? RRD_MEMORY_MODE_NONE : RRD_MEMORY_MODE_RAM;
 450     }
 451
 452     st->config_section = strdup(config_section);
 453     st->rrdhost = host;
 454     st->memsize = size;
 455     st->entries = entries;
 456     st->update_every = update_every;
 457
 458     if(st->current_entry >= st->entries) st->current_entry = 0;
 459
 460     strcpy(st->cache_filename, fullfilename);
 461     strcpy(st->magic, RRDSET_MAGIC);
 462
 463     strcpy(st->id, fullid);
 464     st->hash = simple_hash(st->id);
 465
 466     st->cache_dir = cache_dir;
 467
 468     st->chart_type = rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
 469     st->type       = config_get(st->config_section, "type", type);
 470     st->family     = config_get(st->config_section, "family", family?family:st->type);
 471     st->units      = config_get(st->config_section, "units", units?units:"");
 472
 473     st->context    = config_get(st->config_section, "context", context?context:st->id);
 474     st->hash_context = simple_hash(st->context);
 475
 476     st->priority = config_get_number(st->config_section, "priority", priority);
 477     if(enabled)
 478         rrdset_flag_set(st, RRDSET_FLAG_ENABLED);
 479     else
 480         rrdset_flag_clear(st, RRDSET_FLAG_ENABLED);
 481
 482     rrdset_flag_clear(st, RRDSET_FLAG_DETAIL);
 483     rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
 484     rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 485
 486     // if(!strcmp(st->id, "disk_util.dm-0")) {
 487     //     st->debug = 1;
 488     //     error("enabled debugging for '%s'", st->id);
 489     // }
 490     // else error("not enabled debugging for '%s'", st->id);
 491
 492     st->green = NAN;
 493     st->red = NAN;
 494
 495     st->last_collected_time.tv_sec = 0;
 496     st->last_collected_time.tv_usec = 0;
 497     st->counter_done = 0;
 498
 499     st->gap_when_lost_iterations_above = (int) (
 500             config_get_number(st->config_section, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 501
 502     avl_init_lock(&st->dimensions_index, rrddim_compare);
 503     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 504
 505     pthread_rwlock_init(&st->rrdset_rwlock, NULL);
 506     rrdhost_wrlock(host);
 507
 508     if(name && *name) rrdset_set_name(st, name);
 509     else rrdset_set_name(st, id);
 510
 511     {
 512         char varvalue[CONFIG_MAX_VALUE + 1];
 513         char varvalue2[CONFIG_MAX_VALUE + 1];
 514         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 515         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 516         st->title = config_get(st->config_section, "title", varvalue2);
 517     }
 518
 519     st->rrdfamily = rrdfamily_create(host, st->family);
 520
 521     st->next = host->rrdset_root;
 522     host->rrdset_root = st;
 523
 524     if(host->health_enabled) {
 525         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 526         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 527         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 528         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 529         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 530     }
 531
 532     if(unlikely(rrdset_index_add(host, st) != st))
 533         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 534
 535     rrdsetcalc_link_matching(st);
 536     rrdcalctemplate_link_matching(st);
 537
 538     rrdhost_cleanup(host);
 539
 540     rrdhost_unlock(host);
 541
 542     return(st);
 543 }
 544
 545
 546 // ----------------------------------------------------------------------------
 547 // RRDSET - data collection iteration control
 548
 549 inline void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds) {
 550
 551     if(unlikely(!st->last_collected_time.tv_sec)) {
 552         // the first entry
 553         microseconds = st->update_every * USEC_PER_SEC;
 554     }
 555     else if(unlikely(!microseconds)) {
 556         // no dt given by the plugin
 557         struct timeval now;
 558         now_realtime_timeval(&now);
 559         microseconds = dt_usec(&now, &st->last_collected_time);
 560     }
 561
 562     st->usec_since_last_update = microseconds;
 563 }
 564
 565 inline void rrdset_next_usec(RRDSET *st, usec_t microseconds) {
 566     struct timeval now;
 567     now_realtime_timeval(&now);
 568
 569     if(unlikely(!st->last_collected_time.tv_sec)) {
 570         // the first entry
 571         microseconds = st->update_every * USEC_PER_SEC;
 572     }
 573     else if(unlikely(!microseconds)) {
 574         // no dt given by the plugin
 575         microseconds = dt_usec(&now, &st->last_collected_time);
 576     }
 577     else {
 578         // microseconds has the time since the last collection
 579 //#ifdef NETDATA_INTERNAL_CHECKS
 580 //        usec_t now_usec = timeval_usec(&now);
 581 //        usec_t last_usec = timeval_usec(&st->last_collected_time);
 582 //#endif
 583         susec_t since_last_usec = dt_usec_signed(&now, &st->last_collected_time);
 584
 585         if(unlikely(since_last_usec < 0)) {
 586             // oops! the database is in the future
 587             error("Database for chart '%s' on host '%s' is %lld microseconds in the future. Adjusting it to current time.", st->id, st->rrdhost->hostname, -since_last_usec);
 588
 589             st->last_collected_time.tv_sec  = now.tv_sec - st->update_every;
 590             st->last_collected_time.tv_usec = now.tv_usec;
 591             last_collected_time_align(&st->last_collected_time, st->update_every);
 592
 593             st->last_updated.tv_sec  = now.tv_sec - st->update_every;
 594             st->last_updated.tv_usec = now.tv_usec;
 595             last_updated_time_align(&st->last_updated, st->update_every);
 596
 597             microseconds    = st->update_every * USEC_PER_SEC;
 598             since_last_usec = st->update_every * USEC_PER_SEC;
 599         }
 600
 601         // verify the microseconds given is good
 602         if(unlikely(microseconds > (usec_t)since_last_usec)) {
 603             debug(D_RRD_CALLS, "dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - (usec_t)since_last_usec, st->name, st->id);
 604
 605 //#ifdef NETDATA_INTERNAL_CHECKS
 606 //            if(unlikely(last_usec + microseconds > now_usec + 1000))
 607 //                error("dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - (usec_t)since_last_usec, st->name, st->id);
 608 //#endif
 609
 610             microseconds = (usec_t)since_last_usec;
 611         }
 612         else if(unlikely(microseconds < (usec_t)since_last_usec * 0.8)) {
 613             debug(D_RRD_CALLS, "dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, (usec_t)since_last_usec, st->name, st->id);
 614
 615 //#ifdef NETDATA_INTERNAL_CHECKS
 616 //            error("dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, (usec_t)since_last_usec, st->name, st->id);
 617 //#endif
 618             microseconds = (usec_t)since_last_usec;
 619         }
 620     }
 621     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 622
 623     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 624         debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 625
 626     st->usec_since_last_update = microseconds;
 627 }
 628
 629
 630 // ----------------------------------------------------------------------------
 631 // RRDSET - process the collected values for all dimensions of a chart
 632
 633 static inline void rrdset_init_last_collected_time(RRDSET *st) {
 634     now_realtime_timeval(&st->last_collected_time);
 635     last_collected_time_align(&st->last_collected_time, st->update_every);
 636 }
 637
 638 static inline usec_t rrdset_update_last_collected_time(RRDSET *st) {
 639     usec_t last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 640     usec_t ut = last_collect_ut + st->usec_since_last_update;
 641     st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
 642     st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 643     return last_collect_ut;
 644 }
 645
 646 static inline void rrdset_init_last_updated_time(RRDSET *st) {
 647     // copy the last collected time to last updated time
 648     st->last_updated.tv_sec  = st->last_collected_time.tv_sec;
 649     st->last_updated.tv_usec = st->last_collected_time.tv_usec;
 650     last_updated_time_align(&st->last_updated, st->update_every);
 651 }
 652
 653 static inline void rrdset_done_push_exclusive(RRDSET *st) {
 654     if(unlikely(!st->last_collected_time.tv_sec)) {
 655         // it is the first entry
 656         // set the last_collected_time to now
 657         rrdset_init_last_collected_time(st);
 658     }
 659     else {
 660         // it is not the first entry
 661         // calculate the proper last_collected_time, using usec_since_last_update
 662         rrdset_update_last_collected_time(st);
 663     }
 664
 665     st->counter_done++;
 666
 667     rrdset_rdlock(st);
 668     rrdset_done_push(st);
 669     rrdset_unlock(st);
 670 }
 671
 672 void rrdset_done(RRDSET *st) {
 673     if(unlikely(netdata_exit)) return;
 674
 675     if(unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
 676         if(unlikely(st->rrdhost->rrdpush_enabled))
 677             rrdset_done_push_exclusive(st);
 678
 679         return;
 680     }
 681
 682     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 683
 684     RRDDIM *rd;
 685
 686     int
 687             pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
 688
 689     char
 690             store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
 691             first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
 692
 693     unsigned int
 694             stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
 695
 696     usec_t
 697             last_collect_ut,        // the timestamp in microseconds, of the last collected value
 698             now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
 699             last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
 700             next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
 701             update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
 702
 703     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 704         error("Cannot set pthread cancel state to DISABLE.");
 705
 706     // a read lock is OK here
 707     rrdset_rdlock(st);
 708
 709 /*
 710     // enable the chart, if it was disabled
 711     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 712         st->enabled = 1;
 713 */
 714
 715     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE))) {
 716         error("Chart '%s' has the OBSOLETE flag set, but it is collected.", st->id);
 717         rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 718     }
 719
 720     // check if the chart has a long time to be updated
 721     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
 722         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 723         rrdset_reset(st);
 724         st->usec_since_last_update = update_every_ut;
 725         first_entry = 1;
 726     }
 727
 728     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 729         debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 730
 731     // set last_collected_time
 732     if(unlikely(!st->last_collected_time.tv_sec)) {
 733         // it is the first entry
 734         // set the last_collected_time to now
 735         rrdset_init_last_collected_time(st);
 736
 737         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
 738
 739         // the first entry should not be stored
 740         store_this_entry = 0;
 741         first_entry = 1;
 742
 743         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 744             debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
 745     }
 746     else {
 747         // it is not the first entry
 748         // calculate the proper last_collected_time, using usec_since_last_update
 749         last_collect_ut = rrdset_update_last_collected_time(st);
 750     }
 751
 752     // if this set has not been updated in the past
 753     // we fake the last_update time to be = now - usec_since_last_update
 754     if(unlikely(!st->last_updated.tv_sec)) {
 755         // it has never been updated before
 756         // set a fake last_updated, in the past using usec_since_last_update
 757         rrdset_init_last_updated_time(st);
 758
 759         // the first entry should not be stored
 760         store_this_entry = 0;
 761         first_entry = 1;
 762
 763         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 764             debug(D_RRD_STATS, "%s: initializing last_updated to last_collected_time - %llu microseconds. Will not store the next entry.", st->name, st->usec_since_last_update);
 765     }
 766
 767     // check if we will re-write the entire data set
 768     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
 769         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);
 770         rrdset_reset(st);
 771         rrdset_init_last_updated_time(st);
 772
 773         st->usec_since_last_update = update_every_ut;
 774
 775         // the first entry should not be stored
 776         store_this_entry = 0;
 777         first_entry = 1;
 778     }
 779
 780     // these are the 3 variables that will help us in interpolation
 781     // last_stored_ut = the last time we added a value to the storage
 782     // now_collect_ut = the time the current value has been collected
 783     // next_store_ut  = the time of the next interpolation point
 784     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
 785     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 786     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
 787
 788     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 789         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
 790         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
 791         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 792         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 793     }
 794
 795     if(unlikely(!st->counter_done)) {
 796         store_this_entry = 0;
 797         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 798             debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
 799     }
 800     st->counter_done++;
 801
 802     if(unlikely(st->rrdhost->rrdpush_enabled))
 803         rrdset_done_push(st);
 804
 805     // calculate totals and count the dimensions
 806     int dimensions = 0;
 807     st->collected_total = 0;
 808     rrddim_foreach_read(rd, st) {
 809         dimensions++;
 810         if(likely(rd->updated))
 811             st->collected_total += rd->collected_value;
 812     }
 813
 814     uint32_t storage_flags = SN_EXISTS;
 815
 816     // process all dimensions to calculate their values
 817     // based on the collected figures only
 818     // at this stage we do not interpolate anything
 819     rrddim_foreach_read(rd, st) {
 820
 821         if(unlikely(!rd->updated)) {
 822             rd->calculated_value = 0;
 823             continue;
 824         }
 825
 826         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 827             debug(D_RRD_STATS, "%s/%s: START "
 828                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 829                     " collected_value = " COLLECTED_NUMBER_FORMAT
 830                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 831                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 832                                       , st->id, rd->name
 833                                       , rd->last_collected_value
 834                                       , rd->collected_value
 835                                       , rd->last_calculated_value
 836                                       , rd->calculated_value
 837             );
 838
 839         switch(rd->algorithm) {
 840             case RRD_ALGORITHM_ABSOLUTE:
 841                 rd->calculated_value = (calculated_number)rd->collected_value
 842                                        * (calculated_number)rd->multiplier
 843                                        / (calculated_number)rd->divisor;
 844
 845                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 846                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
 847                             CALCULATED_NUMBER_FORMAT " = "
 848                             COLLECTED_NUMBER_FORMAT
 849                             " * " CALCULATED_NUMBER_FORMAT
 850                             " / " CALCULATED_NUMBER_FORMAT
 851                           , st->id, rd->name
 852                           , rd->calculated_value
 853                           , rd->collected_value
 854                           , (calculated_number)rd->multiplier
 855                           , (calculated_number)rd->divisor
 856                     );
 857                 break;
 858
 859             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 860                 if(unlikely(!st->collected_total))
 861                     rd->calculated_value = 0;
 862                 else
 863                     // the percentage of the current value
 864                     // over the total of all dimensions
 865                     rd->calculated_value =
 866                             (calculated_number)100
 867                             * (calculated_number)rd->collected_value
 868                             / (calculated_number)st->collected_total;
 869
 870                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 871                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
 872                             CALCULATED_NUMBER_FORMAT " = 100"
 873                                     " * " COLLECTED_NUMBER_FORMAT
 874                             " / " COLLECTED_NUMBER_FORMAT
 875                           , st->id, rd->name
 876                           , rd->calculated_value
 877                           , rd->collected_value
 878                           , st->collected_total
 879                     );
 880                 break;
 881
 882             case RRD_ALGORITHM_INCREMENTAL:
 883                 if(unlikely(rd->collections_counter <= 1)) {
 884                     rd->calculated_value = 0;
 885                     continue;
 886                 }
 887
 888                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 889                 // to reset the calculation (it will give zero as the calculation for this second)
 890                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 891                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 892                           , st->name, rd->name
 893                           , rd->last_collected_value
 894                           , rd->collected_value);
 895
 896                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 897                         storage_flags = SN_EXISTS_RESET;
 898
 899                     rd->last_collected_value = rd->collected_value;
 900                 }
 901
 902                 rd->calculated_value +=
 903                         (calculated_number)(rd->collected_value - rd->last_collected_value)
 904                         * (calculated_number)rd->multiplier
 905                         / (calculated_number)rd->divisor;
 906
 907                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 908                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
 909                             CALCULATED_NUMBER_FORMAT " = ("
 910                             COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
 911                             ")"
 912                                     " * " CALCULATED_NUMBER_FORMAT
 913                             " / " CALCULATED_NUMBER_FORMAT
 914                           , st->id, rd->name
 915                           , rd->calculated_value
 916                           , rd->collected_value, rd->last_collected_value
 917                           , (calculated_number)rd->multiplier
 918                           , (calculated_number)rd->divisor
 919                     );
 920                 break;
 921
 922             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 923                 if(unlikely(rd->collections_counter <= 1)) {
 924                     rd->calculated_value = 0;
 925                     continue;
 926                 }
 927
 928                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 929                 // to reset the calculation (it will give zero as the calculation for this second)
 930                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 931                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 932                           , st->name, rd->name
 933                           , rd->last_collected_value
 934                           , rd->collected_value);
 935
 936                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 937                         storage_flags = SN_EXISTS_RESET;
 938
 939                     rd->last_collected_value = rd->collected_value;
 940                 }
 941
 942                 // the percentage of the current increment
 943                 // over the increment of all dimensions together
 944                 if(unlikely(st->collected_total == st->last_collected_total))
 945                     rd->calculated_value = 0;
 946                 else
 947                     rd->calculated_value =
 948                             (calculated_number)100
 949                             * (calculated_number)(rd->collected_value - rd->last_collected_value)
 950                             / (calculated_number)(st->collected_total - st->last_collected_total);
 951
 952                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 953                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
 954                             CALCULATED_NUMBER_FORMAT " = 100"
 955                                     " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 956                                     " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 957                           , st->id, rd->name
 958                           , rd->calculated_value
 959                           , rd->collected_value, rd->last_collected_value
 960                           , st->collected_total, st->last_collected_total
 961                     );
 962                 break;
 963
 964             default:
 965                 // make the default zero, to make sure
 966                 // it gets noticed when we add new types
 967                 rd->calculated_value = 0;
 968
 969                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 970                     debug(D_RRD_STATS, "%s/%s: CALC "
 971                             CALCULATED_NUMBER_FORMAT " = 0"
 972                           , st->id, rd->name
 973                           , rd->calculated_value
 974                     );
 975                 break;
 976         }
 977
 978         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 979             debug(D_RRD_STATS, "%s/%s: PHASE2 "
 980                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 981                     " collected_value = " COLLECTED_NUMBER_FORMAT
 982                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 983                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 984                                       , st->id, rd->name
 985                                       , rd->last_collected_value
 986                                       , rd->collected_value
 987                                       , rd->last_calculated_value
 988                                       , rd->calculated_value
 989             );
 990
 991     }
 992
 993     // at this point we have all the calculated values ready
 994     // it is now time to interpolate values on a second boundary
 995
 996     if(unlikely(now_collect_ut < next_store_ut)) {
 997         // this is collected in the same interpolation point
 998
 999         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1000             debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1001
1002 //#ifdef NETDATA_INTERNAL_CHECKS
1003 //        info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1004 //#endif
1005     }
1006
1007     usec_t first_ut = last_stored_ut;
1008     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1009     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1010
1011     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1012 //#ifdef NETDATA_INTERNAL_CHECKS
1013 //        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); }
1014 //#endif
1015
1016         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1017             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1018             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1019         }
1020
1021         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
1022         st->last_updated.tv_usec = 0;
1023
1024         rrddim_foreach_read(rd, st) {
1025             calculated_number new_value;
1026
1027             switch(rd->algorithm) {
1028                 case RRD_ALGORITHM_INCREMENTAL:
1029                     new_value = (calculated_number)
1030                             (      rd->calculated_value
1031                                    * (calculated_number)(next_store_ut - last_collect_ut)
1032                                    / (calculated_number)(now_collect_ut - last_collect_ut)
1033                             );
1034
1035                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1036                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1037                                 CALCULATED_NUMBER_FORMAT " = "
1038                                 CALCULATED_NUMBER_FORMAT
1039                                 " * %llu"
1040                                         " / %llu"
1041                               , st->id, rd->name
1042                               , new_value
1043                               , rd->calculated_value
1044                               , (next_store_ut - last_stored_ut)
1045                               , (now_collect_ut - last_stored_ut)
1046                         );
1047
1048                     rd->calculated_value -= new_value;
1049                     new_value += rd->last_calculated_value;
1050                     rd->last_calculated_value = 0;
1051                     new_value /= (calculated_number)st->update_every;
1052
1053                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1054                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1055                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1056                                     st->id, rd->name
1057                                   , (calculated_number)(next_store_ut - last_stored_ut)
1058                             );
1059                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1060                     }
1061                     break;
1062
1063                 case RRD_ALGORITHM_ABSOLUTE:
1064                 case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1065                 case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1066                 default:
1067                     if(iterations == 1) {
1068                         // this is the last iteration
1069                         // do not interpolate
1070                         // just show the calculated value
1071
1072                         new_value = rd->calculated_value;
1073                     }
1074                     else {
1075                         // we have missed an update
1076                         // interpolate in the middle values
1077
1078                         new_value = (calculated_number)
1079                                 (   (     (rd->calculated_value - rd->last_calculated_value)
1080                                           * (calculated_number)(next_store_ut - last_collect_ut)
1081                                           / (calculated_number)(now_collect_ut - last_collect_ut)
1082                                     )
1083                                     +  rd->last_calculated_value
1084                                 );
1085
1086                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1087                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1088                                     CALCULATED_NUMBER_FORMAT " = ((("
1089                                             "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1090                                             " * %llu"
1091                                             " / %llu) + " CALCULATED_NUMBER_FORMAT
1092                                   , st->id, rd->name
1093                                   , new_value
1094                                   , rd->calculated_value, rd->last_calculated_value
1095                                   , (next_store_ut - first_ut)
1096                                   , (now_collect_ut - first_ut), rd->last_calculated_value
1097                             );
1098                     }
1099                     break;
1100             }
1101
1102             if(unlikely(!store_this_entry)) {
1103                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1104                 continue;
1105             }
1106
1107             if(likely(rd->updated && rd->collections_counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1108                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1109                 rd->last_stored_value = new_value;
1110
1111                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1112                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1113                             CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1114                           , st->id, rd->name
1115                           , st->current_entry
1116                           , unpack_storage_number(rd->values[st->current_entry]), new_value
1117                     );
1118             }
1119             else {
1120                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1121                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1122                           , st->id, rd->name
1123                           , st->current_entry
1124                     );
1125                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1126                 rd->last_stored_value = NAN;
1127             }
1128
1129             stored_entries++;
1130
1131             if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1132                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1133                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1134                 calculated_number accuracy = accuracy_loss(t1, t2);
1135                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1136                       , st->id, rd->name
1137                       , st->current_entry
1138                       , t2
1139                       , get_storage_number_flags(rd->values[st->current_entry])
1140                       , t1
1141                       , accuracy
1142                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1143                 );
1144
1145                 rd->collected_volume += t1;
1146                 rd->stored_volume += t2;
1147                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1148                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1149                       , st->id, rd->name
1150                       , st->current_entry
1151                       , rd->stored_volume
1152                       , rd->collected_volume
1153                       , accuracy
1154                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1155                 );
1156
1157             }
1158         }
1159         // reset the storage flags for the next point, if any;
1160         storage_flags = SN_EXISTS;
1161
1162         st->counter++;
1163         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1164         last_stored_ut = next_store_ut;
1165     }
1166
1167     st->last_collected_total  = st->collected_total;
1168
1169     rrddim_foreach_read(rd, st) {
1170         if(unlikely(!rd->updated))
1171             continue;
1172
1173         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1174             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);
1175
1176         rd->last_collected_value = rd->collected_value;
1177
1178         switch(rd->algorithm) {
1179             case RRD_ALGORITHM_INCREMENTAL:
1180                 if(unlikely(!first_entry)) {
1181                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1182                         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);
1183                     rd->last_calculated_value += rd->calculated_value;
1184                 }
1185                 else {
1186                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1187                         debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1188                 }
1189                 break;
1190
1191             case RRD_ALGORITHM_ABSOLUTE:
1192             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1193             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1194                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1195                     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);
1196                 rd->last_calculated_value = rd->calculated_value;
1197                 break;
1198         }
1199
1200         rd->calculated_value = 0;
1201         rd->collected_value = 0;
1202         rd->updated = 0;
1203
1204         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1205             debug(D_RRD_STATS, "%s/%s: END "
1206                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
1207                     " collected_value = " COLLECTED_NUMBER_FORMAT
1208                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1209                     " calculated_value = " CALCULATED_NUMBER_FORMAT
1210                                       , st->id, rd->name
1211                                       , rd->last_collected_value
1212                                       , rd->collected_value
1213                                       , rd->last_calculated_value
1214                                       , rd->calculated_value
1215             );
1216     }
1217
1218     // ALL DONE ABOUT THE DATA UPDATE
1219     // --------------------------------------------------------------------
1220
1221 /*
1222     // find if there are any obsolete dimensions (not updated recently)
1223     if(unlikely(rrd_delete_unupdated_dimensions)) {
1224
1225         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1226             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1227                 break;
1228
1229         if(unlikely(rd)) {
1230             RRDDIM *last;
1231             // there is dimension to free
1232             // upgrade our read lock to a write lock
1233             pthread_rwlock_unlock(&st->rrdset_rwlock);
1234             pthread_rwlock_wrlock(&st->rrdset_rwlock);
1235
1236             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1237                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1238
1239                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1240                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1241
1242                     if(unlikely(!last)) {
1243                         st->dimensions = rd->next;
1244                         rd->next = NULL;
1245                         rrddim_free(st, rd);
1246                         rd = st->dimensions;
1247                         continue;
1248                     }
1249                     else {
1250                         last->next = rd->next;
1251                         rd->next = NULL;
1252                         rrddim_free(st, rd);
1253                         rd = last->next;
1254                         continue;
1255                     }
1256                 }
1257
1258                 last = rd;
1259                 rd = rd->next;
1260             }
1261
1262             if(unlikely(!st->dimensions)) {
1263                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1264                 st->enabled = 0;
1265             }
1266         }
1267     }
1268 */
1269
1270     rrdset_unlock(st);
1271
1272     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1273         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1274 }