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 void rrdset_delete(RRDSET *st) {
 309     RRDDIM *rd;
 310
 311     rrdset_check_rdlock(st);
 312
 313     // info("Deleting chart '%s' ('%s')", st->id, st->name);
 314
 315     if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 316         debug(D_RRD_STATS, "Deleting stats '%s' to '%s'.", st->name, st->cache_filename);
 317         unlink(st->cache_filename);
 318     }
 319
 320     rrddim_foreach_read(rd, st) {
 321         if(likely(rd->rrd_memory_mode == RRD_MEMORY_MODE_SAVE)) {
 322             debug(D_RRD_STATS, "Deleting dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 323             unlink(rd->cache_filename);
 324         }
 325     }
 326 }
 327
 328 // ----------------------------------------------------------------------------
 329 // RRDSET - create a chart
 330
 331 static inline RRDSET *rrdset_find_on_create(RRDHOST *host, const char *fullid) {
 332     RRDSET *st = rrdset_find(host, fullid);
 333     if(unlikely(st)) {
 334         rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 335         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 336         return st;
 337     }
 338
 339     return NULL;
 340 }
 341
 342 RRDSET *rrdset_create(
 343           RRDHOST *host
 344         , const char *type
 345         , const char *id
 346         , const char *name
 347         , const char *family
 348         , const char *context
 349         , const char *title
 350         , const char *units
 351         , long priority
 352         , int update_every
 353         , RRDSET_TYPE chart_type
 354 ) {
 355     if(!type || !type[0]) {
 356         fatal("Cannot create rrd stats without a type.");
 357         return NULL;
 358     }
 359
 360     if(!id || !id[0]) {
 361         fatal("Cannot create rrd stats without an id.");
 362         return NULL;
 363     }
 364
 365     // ------------------------------------------------------------------------
 366     // check if it already exists
 367
 368     char fullid[RRD_ID_LENGTH_MAX + 1];
 369     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 370
 371     RRDSET *st = rrdset_find_on_create(host, fullid);
 372     if(st) return st;
 373
 374     rrdhost_wrlock(host);
 375
 376     st = rrdset_find_on_create(host, fullid);
 377     if(st) {
 378         rrdhost_unlock(host);
 379         return st;
 380     }
 381
 382     char fullfilename[FILENAME_MAX + 1];
 383
 384     // ------------------------------------------------------------------------
 385     // compose the config_section for this chart
 386
 387     char config_section[RRD_ID_LENGTH_MAX + 1];
 388     if(host == localhost)
 389         strcpy(config_section, fullid);
 390     else
 391         snprintfz(config_section, RRD_ID_LENGTH_MAX, "%s/%s", host->machine_guid, fullid);
 392
 393     // ------------------------------------------------------------------------
 394     // get the options from the config, we need to create it
 395
 396     long rentries = config_get_number(config_section, "history", host->rrd_history_entries);
 397     long entries = align_entries_to_pagesize(host->rrd_memory_mode, rentries);
 398     if(entries != rentries) entries = config_set_number(config_section, "history", entries);
 399
 400     if(host->rrd_memory_mode == RRD_MEMORY_MODE_NONE && entries != rentries)
 401         entries = config_set_number(config_section, "history", 10);
 402
 403     int enabled = config_get_boolean(config_section, "enabled", 1);
 404     if(!enabled) entries = 5;
 405
 406     unsigned long size = sizeof(RRDSET);
 407     char *cache_dir = rrdset_cache_dir(host, fullid, config_section);
 408
 409     time_t now = now_realtime_sec();
 410
 411     // ------------------------------------------------------------------------
 412     // load it or allocate it
 413
 414     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 415
 416     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 417     if(host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
 418         st = (RRDSET *) mymmap(fullfilename, size, ((host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 0);
 419         if(st) {
 420             memset(&st->avl, 0, sizeof(avl));
 421             memset(&st->avlname, 0, sizeof(avl));
 422             memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 423             memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 424             memset(&st->rrdset_rwlock, 0, sizeof(pthread_rwlock_t));
 425
 426             st->name = NULL;
 427             st->type = NULL;
 428             st->family = NULL;
 429             st->context = NULL;
 430             st->title = NULL;
 431             st->units = NULL;
 432             st->dimensions = NULL;
 433             st->next = NULL;
 434             st->variables = NULL;
 435             st->alarms = NULL;
 436             st->flags = 0x00000000;
 437
 438             if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 439                 errno = 0;
 440                 info("Initializing file %s.", fullfilename);
 441                 memset(st, 0, size);
 442             }
 443             else if(strcmp(st->id, fullid) != 0) {
 444                 errno = 0;
 445                 error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 446                 // munmap(st, size);
 447                 // st = NULL;
 448                 memset(st, 0, size);
 449             }
 450             else if(st->memsize != size || st->entries != entries) {
 451                 errno = 0;
 452                 error("File %s does not have the desired size. Clearing it.", fullfilename);
 453                 memset(st, 0, size);
 454             }
 455             else if(st->update_every != update_every) {
 456                 errno = 0;
 457                 error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 458                 memset(st, 0, size);
 459             }
 460             else if((now - st->last_updated.tv_sec) > update_every * entries) {
 461                 errno = 0;
 462                 error("File %s is too old. Clearing it.", fullfilename);
 463                 memset(st, 0, size);
 464             }
 465             else if(st->last_updated.tv_sec > now + update_every) {
 466                 errno = 0;
 467                 error("File %s refers to the future. Clearing it.", fullfilename);
 468                 memset(st, 0, size);
 469             }
 470
 471             // make sure the database is aligned
 472             if(st->last_updated.tv_sec)
 473                 last_updated_time_align(&st->last_updated, update_every);
 474
 475
 476             // make sure we have the right memory mode
 477             // even if we cleared the memory
 478             st->rrd_memory_mode = host->rrd_memory_mode;
 479         }
 480     }
 481
 482     if(unlikely(!st)) {
 483         st = callocz(1, size);
 484         st->rrd_memory_mode = (host->rrd_memory_mode == RRD_MEMORY_MODE_NONE) ? RRD_MEMORY_MODE_NONE : RRD_MEMORY_MODE_RAM;
 485     }
 486
 487     st->config_section = strdup(config_section);
 488     st->rrdhost = host;
 489     st->memsize = size;
 490     st->entries = entries;
 491     st->update_every = update_every;
 492
 493     if(st->current_entry >= st->entries) st->current_entry = 0;
 494
 495     strcpy(st->cache_filename, fullfilename);
 496     strcpy(st->magic, RRDSET_MAGIC);
 497
 498     strcpy(st->id, fullid);
 499     st->hash = simple_hash(st->id);
 500
 501     st->cache_dir = cache_dir;
 502
 503     st->chart_type = rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
 504     st->type       = config_get(st->config_section, "type", type);
 505     st->family     = config_get(st->config_section, "family", family?family:st->type);
 506     st->units      = config_get(st->config_section, "units", units?units:"");
 507
 508     st->context    = config_get(st->config_section, "context", context?context:st->id);
 509     st->hash_context = simple_hash(st->context);
 510
 511     st->priority = config_get_number(st->config_section, "priority", priority);
 512     if(enabled)
 513         rrdset_flag_set(st, RRDSET_FLAG_ENABLED);
 514     else
 515         rrdset_flag_clear(st, RRDSET_FLAG_ENABLED);
 516
 517     rrdset_flag_clear(st, RRDSET_FLAG_DETAIL);
 518     rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
 519     rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 520
 521     // if(!strcmp(st->id, "disk_util.dm-0")) {
 522     //     st->debug = 1;
 523     //     error("enabled debugging for '%s'", st->id);
 524     // }
 525     // else error("not enabled debugging for '%s'", st->id);
 526
 527     st->green = NAN;
 528     st->red = NAN;
 529
 530     st->last_collected_time.tv_sec = 0;
 531     st->last_collected_time.tv_usec = 0;
 532     st->counter_done = 0;
 533
 534     st->gap_when_lost_iterations_above = (int) (
 535             config_get_number(st->config_section, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 536
 537     avl_init_lock(&st->dimensions_index, rrddim_compare);
 538     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 539
 540     pthread_rwlock_init(&st->rrdset_rwlock, NULL);
 541
 542     if(name && *name) rrdset_set_name(st, name);
 543     else rrdset_set_name(st, id);
 544
 545     {
 546         char varvalue[CONFIG_MAX_VALUE + 1];
 547         char varvalue2[CONFIG_MAX_VALUE + 1];
 548         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 549         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 550         st->title = config_get(st->config_section, "title", varvalue2);
 551     }
 552
 553     st->rrdfamily = rrdfamily_create(host, st->family);
 554
 555     st->next = host->rrdset_root;
 556     host->rrdset_root = st;
 557
 558     if(host->health_enabled) {
 559         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 560         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 561         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 562         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 563         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 564     }
 565
 566     if(unlikely(rrdset_index_add(host, st) != st))
 567         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 568
 569     rrdsetcalc_link_matching(st);
 570     rrdcalctemplate_link_matching(st);
 571
 572     rrdhost_cleanup_obsolete(host);
 573
 574     rrdhost_unlock(host);
 575
 576     return(st);
 577 }
 578
 579
 580 // ----------------------------------------------------------------------------
 581 // RRDSET - data collection iteration control
 582
 583 inline void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds) {
 584
 585     if(unlikely(!st->last_collected_time.tv_sec)) {
 586         // the first entry
 587         microseconds = st->update_every * USEC_PER_SEC;
 588     }
 589     else if(unlikely(!microseconds)) {
 590         // no dt given by the plugin
 591         struct timeval now;
 592         now_realtime_timeval(&now);
 593         microseconds = dt_usec(&now, &st->last_collected_time);
 594     }
 595
 596     st->usec_since_last_update = microseconds;
 597 }
 598
 599 inline void rrdset_next_usec(RRDSET *st, usec_t microseconds) {
 600     struct timeval now;
 601     now_realtime_timeval(&now);
 602
 603     if(unlikely(!st->last_collected_time.tv_sec)) {
 604         // the first entry
 605         microseconds = st->update_every * USEC_PER_SEC;
 606     }
 607     else if(unlikely(!microseconds)) {
 608         // no dt given by the plugin
 609         microseconds = dt_usec(&now, &st->last_collected_time);
 610     }
 611     else {
 612         // microseconds has the time since the last collection
 613 //#ifdef NETDATA_INTERNAL_CHECKS
 614 //        usec_t now_usec = timeval_usec(&now);
 615 //        usec_t last_usec = timeval_usec(&st->last_collected_time);
 616 //#endif
 617         susec_t since_last_usec = dt_usec_signed(&now, &st->last_collected_time);
 618
 619         if(unlikely(since_last_usec < 0)) {
 620             // oops! the database is in the future
 621             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);
 622
 623             st->last_collected_time.tv_sec  = now.tv_sec - st->update_every;
 624             st->last_collected_time.tv_usec = now.tv_usec;
 625             last_collected_time_align(&st->last_collected_time, st->update_every);
 626
 627             st->last_updated.tv_sec  = now.tv_sec - st->update_every;
 628             st->last_updated.tv_usec = now.tv_usec;
 629             last_updated_time_align(&st->last_updated, st->update_every);
 630
 631             microseconds    = st->update_every * USEC_PER_SEC;
 632             since_last_usec = st->update_every * USEC_PER_SEC;
 633         }
 634
 635         // verify the microseconds given is good
 636         if(unlikely(microseconds > (usec_t)since_last_usec)) {
 637             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);
 638
 639 //#ifdef NETDATA_INTERNAL_CHECKS
 640 //            if(unlikely(last_usec + microseconds > now_usec + 1000))
 641 //                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);
 642 //#endif
 643
 644             microseconds = (usec_t)since_last_usec;
 645         }
 646         else if(unlikely(microseconds < (usec_t)since_last_usec * 0.8)) {
 647             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);
 648
 649 //#ifdef NETDATA_INTERNAL_CHECKS
 650 //            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);
 651 //#endif
 652             microseconds = (usec_t)since_last_usec;
 653         }
 654     }
 655     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 656
 657     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 658         debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 659
 660     st->usec_since_last_update = microseconds;
 661 }
 662
 663
 664 // ----------------------------------------------------------------------------
 665 // RRDSET - process the collected values for all dimensions of a chart
 666
 667 static inline void rrdset_init_last_collected_time(RRDSET *st) {
 668     now_realtime_timeval(&st->last_collected_time);
 669     last_collected_time_align(&st->last_collected_time, st->update_every);
 670 }
 671
 672 static inline usec_t rrdset_update_last_collected_time(RRDSET *st) {
 673     usec_t last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 674     usec_t ut = last_collect_ut + st->usec_since_last_update;
 675     st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
 676     st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 677     return last_collect_ut;
 678 }
 679
 680 static inline void rrdset_init_last_updated_time(RRDSET *st) {
 681     // copy the last collected time to last updated time
 682     st->last_updated.tv_sec  = st->last_collected_time.tv_sec;
 683     st->last_updated.tv_usec = st->last_collected_time.tv_usec;
 684     last_updated_time_align(&st->last_updated, st->update_every);
 685 }
 686
 687 static inline void rrdset_done_push_exclusive(RRDSET *st) {
 688     if(unlikely(!st->last_collected_time.tv_sec)) {
 689         // it is the first entry
 690         // set the last_collected_time to now
 691         rrdset_init_last_collected_time(st);
 692     }
 693     else {
 694         // it is not the first entry
 695         // calculate the proper last_collected_time, using usec_since_last_update
 696         rrdset_update_last_collected_time(st);
 697     }
 698
 699     st->counter_done++;
 700
 701     rrdset_rdlock(st);
 702     rrdset_done_push(st);
 703     rrdset_unlock(st);
 704 }
 705
 706 void rrdset_done(RRDSET *st) {
 707     if(unlikely(netdata_exit)) return;
 708
 709     if(unlikely(st->rrd_memory_mode == RRD_MEMORY_MODE_NONE)) {
 710         if(unlikely(st->rrdhost->rrdpush_enabled))
 711             rrdset_done_push_exclusive(st);
 712
 713         return;
 714     }
 715
 716     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 717
 718     RRDDIM *rd;
 719
 720     int
 721             pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
 722
 723     char
 724             store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
 725             first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
 726
 727     unsigned int
 728             stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
 729
 730     usec_t
 731             last_collect_ut,        // the timestamp in microseconds, of the last collected value
 732             now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
 733             last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
 734             next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
 735             update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
 736
 737     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 738         error("Cannot set pthread cancel state to DISABLE.");
 739
 740     // a read lock is OK here
 741     rrdset_rdlock(st);
 742
 743 /*
 744     // enable the chart, if it was disabled
 745     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 746         st->enabled = 1;
 747 */
 748
 749     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_OBSOLETE))) {
 750         error("Chart '%s' has the OBSOLETE flag set, but it is collected.", st->id);
 751         rrdset_flag_clear(st, RRDSET_FLAG_OBSOLETE);
 752     }
 753
 754     // check if the chart has a long time to be updated
 755     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
 756         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 757         rrdset_reset(st);
 758         st->usec_since_last_update = update_every_ut;
 759         first_entry = 1;
 760     }
 761
 762     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 763         debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 764
 765     // set last_collected_time
 766     if(unlikely(!st->last_collected_time.tv_sec)) {
 767         // it is the first entry
 768         // set the last_collected_time to now
 769         rrdset_init_last_collected_time(st);
 770
 771         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
 772
 773         // the first entry should not be stored
 774         store_this_entry = 0;
 775         first_entry = 1;
 776
 777         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 778             debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
 779     }
 780     else {
 781         // it is not the first entry
 782         // calculate the proper last_collected_time, using usec_since_last_update
 783         last_collect_ut = rrdset_update_last_collected_time(st);
 784     }
 785
 786     // if this set has not been updated in the past
 787     // we fake the last_update time to be = now - usec_since_last_update
 788     if(unlikely(!st->last_updated.tv_sec)) {
 789         // it has never been updated before
 790         // set a fake last_updated, in the past using usec_since_last_update
 791         rrdset_init_last_updated_time(st);
 792
 793         // the first entry should not be stored
 794         store_this_entry = 0;
 795         first_entry = 1;
 796
 797         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 798             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);
 799     }
 800
 801     // check if we will re-write the entire data set
 802     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
 803         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);
 804         rrdset_reset(st);
 805         rrdset_init_last_updated_time(st);
 806
 807         st->usec_since_last_update = update_every_ut;
 808
 809         // the first entry should not be stored
 810         store_this_entry = 0;
 811         first_entry = 1;
 812     }
 813
 814     // these are the 3 variables that will help us in interpolation
 815     // last_stored_ut = the last time we added a value to the storage
 816     // now_collect_ut = the time the current value has been collected
 817     // next_store_ut  = the time of the next interpolation point
 818     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
 819     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 820     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
 821
 822     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 823         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
 824         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
 825         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 826         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 827     }
 828
 829     if(unlikely(!st->counter_done)) {
 830         store_this_entry = 0;
 831         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 832             debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
 833     }
 834     st->counter_done++;
 835
 836     if(unlikely(st->rrdhost->rrdpush_enabled))
 837         rrdset_done_push(st);
 838
 839     // calculate totals and count the dimensions
 840     int dimensions = 0;
 841     st->collected_total = 0;
 842     rrddim_foreach_read(rd, st) {
 843         dimensions++;
 844         if(likely(rd->updated))
 845             st->collected_total += rd->collected_value;
 846     }
 847
 848     uint32_t storage_flags = SN_EXISTS;
 849
 850     // process all dimensions to calculate their values
 851     // based on the collected figures only
 852     // at this stage we do not interpolate anything
 853     rrddim_foreach_read(rd, st) {
 854
 855         if(unlikely(!rd->updated)) {
 856             rd->calculated_value = 0;
 857             continue;
 858         }
 859
 860         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 861             debug(D_RRD_STATS, "%s/%s: START "
 862                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 863                     " collected_value = " COLLECTED_NUMBER_FORMAT
 864                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 865                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 866                                       , st->id, rd->name
 867                                       , rd->last_collected_value
 868                                       , rd->collected_value
 869                                       , rd->last_calculated_value
 870                                       , rd->calculated_value
 871             );
 872
 873         switch(rd->algorithm) {
 874             case RRD_ALGORITHM_ABSOLUTE:
 875                 rd->calculated_value = (calculated_number)rd->collected_value
 876                                        * (calculated_number)rd->multiplier
 877                                        / (calculated_number)rd->divisor;
 878
 879                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 880                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
 881                             CALCULATED_NUMBER_FORMAT " = "
 882                             COLLECTED_NUMBER_FORMAT
 883                             " * " CALCULATED_NUMBER_FORMAT
 884                             " / " CALCULATED_NUMBER_FORMAT
 885                           , st->id, rd->name
 886                           , rd->calculated_value
 887                           , rd->collected_value
 888                           , (calculated_number)rd->multiplier
 889                           , (calculated_number)rd->divisor
 890                     );
 891                 break;
 892
 893             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 894                 if(unlikely(!st->collected_total))
 895                     rd->calculated_value = 0;
 896                 else
 897                     // the percentage of the current value
 898                     // over the total of all dimensions
 899                     rd->calculated_value =
 900                             (calculated_number)100
 901                             * (calculated_number)rd->collected_value
 902                             / (calculated_number)st->collected_total;
 903
 904                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 905                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
 906                             CALCULATED_NUMBER_FORMAT " = 100"
 907                                     " * " COLLECTED_NUMBER_FORMAT
 908                             " / " COLLECTED_NUMBER_FORMAT
 909                           , st->id, rd->name
 910                           , rd->calculated_value
 911                           , rd->collected_value
 912                           , st->collected_total
 913                     );
 914                 break;
 915
 916             case RRD_ALGORITHM_INCREMENTAL:
 917                 if(unlikely(rd->collections_counter <= 1)) {
 918                     rd->calculated_value = 0;
 919                     continue;
 920                 }
 921
 922                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 923                 // to reset the calculation (it will give zero as the calculation for this second)
 924                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 925                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 926                           , st->name, rd->name
 927                           , rd->last_collected_value
 928                           , rd->collected_value);
 929
 930                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 931                         storage_flags = SN_EXISTS_RESET;
 932
 933                     rd->last_collected_value = rd->collected_value;
 934                 }
 935
 936                 rd->calculated_value +=
 937                         (calculated_number)(rd->collected_value - rd->last_collected_value)
 938                         * (calculated_number)rd->multiplier
 939                         / (calculated_number)rd->divisor;
 940
 941                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 942                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
 943                             CALCULATED_NUMBER_FORMAT " = ("
 944                             COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
 945                             ")"
 946                                     " * " CALCULATED_NUMBER_FORMAT
 947                             " / " CALCULATED_NUMBER_FORMAT
 948                           , st->id, rd->name
 949                           , rd->calculated_value
 950                           , rd->collected_value, rd->last_collected_value
 951                           , (calculated_number)rd->multiplier
 952                           , (calculated_number)rd->divisor
 953                     );
 954                 break;
 955
 956             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 957                 if(unlikely(rd->collections_counter <= 1)) {
 958                     rd->calculated_value = 0;
 959                     continue;
 960                 }
 961
 962                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 963                 // to reset the calculation (it will give zero as the calculation for this second)
 964                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 965                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 966                           , st->name, rd->name
 967                           , rd->last_collected_value
 968                           , rd->collected_value);
 969
 970                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 971                         storage_flags = SN_EXISTS_RESET;
 972
 973                     rd->last_collected_value = rd->collected_value;
 974                 }
 975
 976                 // the percentage of the current increment
 977                 // over the increment of all dimensions together
 978                 if(unlikely(st->collected_total == st->last_collected_total))
 979                     rd->calculated_value = 0;
 980                 else
 981                     rd->calculated_value =
 982                             (calculated_number)100
 983                             * (calculated_number)(rd->collected_value - rd->last_collected_value)
 984                             / (calculated_number)(st->collected_total - st->last_collected_total);
 985
 986                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 987                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
 988                             CALCULATED_NUMBER_FORMAT " = 100"
 989                                     " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 990                                     " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 991                           , st->id, rd->name
 992                           , rd->calculated_value
 993                           , rd->collected_value, rd->last_collected_value
 994                           , st->collected_total, st->last_collected_total
 995                     );
 996                 break;
 997
 998             default:
 999                 // make the default zero, to make sure
1000                 // it gets noticed when we add new types
1001                 rd->calculated_value = 0;
1002
1003                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1004                     debug(D_RRD_STATS, "%s/%s: CALC "
1005                             CALCULATED_NUMBER_FORMAT " = 0"
1006                           , st->id, rd->name
1007                           , rd->calculated_value
1008                     );
1009                 break;
1010         }
1011
1012         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1013             debug(D_RRD_STATS, "%s/%s: PHASE2 "
1014                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
1015                     " collected_value = " COLLECTED_NUMBER_FORMAT
1016                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1017                     " calculated_value = " CALCULATED_NUMBER_FORMAT
1018                                       , st->id, rd->name
1019                                       , rd->last_collected_value
1020                                       , rd->collected_value
1021                                       , rd->last_calculated_value
1022                                       , rd->calculated_value
1023             );
1024
1025     }
1026
1027     // at this point we have all the calculated values ready
1028     // it is now time to interpolate values on a second boundary
1029
1030     if(unlikely(now_collect_ut < next_store_ut)) {
1031         // this is collected in the same interpolation point
1032
1033         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1034             debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1035
1036 //#ifdef NETDATA_INTERNAL_CHECKS
1037 //        info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1038 //#endif
1039     }
1040
1041     usec_t first_ut = last_stored_ut;
1042     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1043     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1044
1045     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1046 //#ifdef NETDATA_INTERNAL_CHECKS
1047 //        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); }
1048 //#endif
1049
1050         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1051             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1052             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1053         }
1054
1055         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
1056         st->last_updated.tv_usec = 0;
1057
1058         rrddim_foreach_read(rd, st) {
1059             calculated_number new_value;
1060
1061             switch(rd->algorithm) {
1062                 case RRD_ALGORITHM_INCREMENTAL:
1063                     new_value = (calculated_number)
1064                             (      rd->calculated_value
1065                                    * (calculated_number)(next_store_ut - last_collect_ut)
1066                                    / (calculated_number)(now_collect_ut - last_collect_ut)
1067                             );
1068
1069                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1070                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1071                                 CALCULATED_NUMBER_FORMAT " = "
1072                                 CALCULATED_NUMBER_FORMAT
1073                                 " * %llu"
1074                                         " / %llu"
1075                               , st->id, rd->name
1076                               , new_value
1077                               , rd->calculated_value
1078                               , (next_store_ut - last_stored_ut)
1079                               , (now_collect_ut - last_stored_ut)
1080                         );
1081
1082                     rd->calculated_value -= new_value;
1083                     new_value += rd->last_calculated_value;
1084                     rd->last_calculated_value = 0;
1085                     new_value /= (calculated_number)st->update_every;
1086
1087                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1088                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1089                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1090                                     st->id, rd->name
1091                                   , (calculated_number)(next_store_ut - last_stored_ut)
1092                             );
1093                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1094                     }
1095                     break;
1096
1097                 case RRD_ALGORITHM_ABSOLUTE:
1098                 case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1099                 case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1100                 default:
1101                     if(iterations == 1) {
1102                         // this is the last iteration
1103                         // do not interpolate
1104                         // just show the calculated value
1105
1106                         new_value = rd->calculated_value;
1107                     }
1108                     else {
1109                         // we have missed an update
1110                         // interpolate in the middle values
1111
1112                         new_value = (calculated_number)
1113                                 (   (     (rd->calculated_value - rd->last_calculated_value)
1114                                           * (calculated_number)(next_store_ut - last_collect_ut)
1115                                           / (calculated_number)(now_collect_ut - last_collect_ut)
1116                                     )
1117                                     +  rd->last_calculated_value
1118                                 );
1119
1120                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1121                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1122                                     CALCULATED_NUMBER_FORMAT " = ((("
1123                                             "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1124                                             " * %llu"
1125                                             " / %llu) + " CALCULATED_NUMBER_FORMAT
1126                                   , st->id, rd->name
1127                                   , new_value
1128                                   , rd->calculated_value, rd->last_calculated_value
1129                                   , (next_store_ut - first_ut)
1130                                   , (now_collect_ut - first_ut), rd->last_calculated_value
1131                             );
1132                     }
1133                     break;
1134             }
1135
1136             if(unlikely(!store_this_entry)) {
1137                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1138                 continue;
1139             }
1140
1141             if(likely(rd->updated && rd->collections_counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1142                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1143                 rd->last_stored_value = new_value;
1144
1145                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1146                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1147                             CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1148                           , st->id, rd->name
1149                           , st->current_entry
1150                           , unpack_storage_number(rd->values[st->current_entry]), new_value
1151                     );
1152             }
1153             else {
1154                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1155                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1156                           , st->id, rd->name
1157                           , st->current_entry
1158                     );
1159                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1160                 rd->last_stored_value = NAN;
1161             }
1162
1163             stored_entries++;
1164
1165             if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1166                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1167                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1168                 calculated_number accuracy = accuracy_loss(t1, t2);
1169                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1170                       , st->id, rd->name
1171                       , st->current_entry
1172                       , t2
1173                       , get_storage_number_flags(rd->values[st->current_entry])
1174                       , t1
1175                       , accuracy
1176                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1177                 );
1178
1179                 rd->collected_volume += t1;
1180                 rd->stored_volume += t2;
1181                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1182                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1183                       , st->id, rd->name
1184                       , st->current_entry
1185                       , rd->stored_volume
1186                       , rd->collected_volume
1187                       , accuracy
1188                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1189                 );
1190
1191             }
1192         }
1193         // reset the storage flags for the next point, if any;
1194         storage_flags = SN_EXISTS;
1195
1196         st->counter++;
1197         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1198         last_stored_ut = next_store_ut;
1199     }
1200
1201     st->last_collected_total  = st->collected_total;
1202
1203     rrddim_foreach_read(rd, st) {
1204         if(unlikely(!rd->updated))
1205             continue;
1206
1207         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1208             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);
1209
1210         rd->last_collected_value = rd->collected_value;
1211
1212         switch(rd->algorithm) {
1213             case RRD_ALGORITHM_INCREMENTAL:
1214                 if(unlikely(!first_entry)) {
1215                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1216                         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);
1217                     rd->last_calculated_value += rd->calculated_value;
1218                 }
1219                 else {
1220                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1221                         debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1222                 }
1223                 break;
1224
1225             case RRD_ALGORITHM_ABSOLUTE:
1226             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1227             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1228                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1229                     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);
1230                 rd->last_calculated_value = rd->calculated_value;
1231                 break;
1232         }
1233
1234         rd->calculated_value = 0;
1235         rd->collected_value = 0;
1236         rd->updated = 0;
1237
1238         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1239             debug(D_RRD_STATS, "%s/%s: END "
1240                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
1241                     " collected_value = " COLLECTED_NUMBER_FORMAT
1242                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1243                     " calculated_value = " CALCULATED_NUMBER_FORMAT
1244                                       , st->id, rd->name
1245                                       , rd->last_collected_value
1246                                       , rd->collected_value
1247                                       , rd->last_calculated_value
1248                                       , rd->calculated_value
1249             );
1250     }
1251
1252     // ALL DONE ABOUT THE DATA UPDATE
1253     // --------------------------------------------------------------------
1254
1255 /*
1256     // find if there are any obsolete dimensions (not updated recently)
1257     if(unlikely(rrd_delete_unupdated_dimensions)) {
1258
1259         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1260             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1261                 break;
1262
1263         if(unlikely(rd)) {
1264             RRDDIM *last;
1265             // there is dimension to free
1266             // upgrade our read lock to a write lock
1267             rrdset_unlock(st);
1268             rrdset_wrlock(st);
1269
1270             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1271                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1272
1273                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1274                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1275
1276                     if(unlikely(!last)) {
1277                         st->dimensions = rd->next;
1278                         rd->next = NULL;
1279                         rrddim_free(st, rd);
1280                         rd = st->dimensions;
1281                         continue;
1282                     }
1283                     else {
1284                         last->next = rd->next;
1285                         rd->next = NULL;
1286                         rrddim_free(st, rd);
1287                         rd = last->next;
1288                         continue;
1289                     }
1290                 }
1291
1292                 last = rd;
1293                 rd = rd->next;
1294             }
1295
1296             if(unlikely(!st->dimensions)) {
1297                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1298                 st->enabled = 0;
1299             }
1300         }
1301     }
1302 */
1303
1304     rrdset_unlock(st);
1305
1306     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1307         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1308 }