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->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(long entries) {
 199     if(central_netdata_to_push_data)
 200         return entries;
 201
 202     if(entries < 5) entries = 5;
 203     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 204
 205     long page = (size_t)sysconf(_SC_PAGESIZE);
 206     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 207     if(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 timeval_align(struct timeval *tv, int update_every) {
 219     tv->tv_sec -= tv->tv_sec % update_every;
 220     tv->tv_usec = 500000;
 221 }
 222
 223 // ----------------------------------------------------------------------------
 224 // RRDSET - free a chart
 225
 226 void rrdset_free(RRDSET *st) {
 227     if(unlikely(!st)) return;
 228
 229     rrdhost_check_wrlock(st->rrdhost);  // make sure we have a write lock on the host
 230     rrdset_wrlock(st);                  // lock this RRDSET
 231
 232     // ------------------------------------------------------------------------
 233     // free its children structures
 234
 235     while(st->variables)  rrdsetvar_free(st->variables);
 236     while(st->alarms)     rrdsetcalc_unlink(st->alarms);
 237     while(st->dimensions) rrddim_free(st, st->dimensions);
 238
 239     rrdfamily_free(st->rrdhost, st->rrdfamily);
 240
 241     // ------------------------------------------------------------------------
 242     // remove it from the indexes
 243
 244     if(unlikely(rrdset_index_del(st->rrdhost, st) != st))
 245         error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 246
 247     rrdset_index_del_name(st->rrdhost, st);
 248
 249     // ------------------------------------------------------------------------
 250     // unlink it from the host
 251
 252     if(st == st->rrdhost->rrdset_root) {
 253         st->rrdhost->rrdset_root = st->next;
 254     }
 255     else {
 256         // find the previous one
 257         RRDSET *s;
 258         for(s = st->rrdhost->rrdset_root; s && s->next != st ; s = s->next) ;
 259
 260         // bypass it
 261         if(s) s->next = st->next;
 262         else error("Request to free RRDSET '%s': cannot find it under host '%s'", st->id, st->rrdhost->hostname);
 263     }
 264
 265     rrdset_unlock(st);
 266
 267     // ------------------------------------------------------------------------
 268     // free it
 269
 270     // free directly allocated members
 271     freez(st->config_section);
 272
 273     if(st->rrd_memory_mode == RRD_MEMORY_MODE_SAVE || st->rrd_memory_mode == RRD_MEMORY_MODE_MAP) {
 274         debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 275         munmap(st, st->memsize);
 276     }
 277     else
 278         freez(st);
 279 }
 280
 281 // ----------------------------------------------------------------------------
 282 // RRDSET - create a chart
 283
 284 RRDSET *rrdset_create(RRDHOST *host, const char *type, const char *id, const char *name, const char *family
 285                       , const char *context, const char *title, const char *units, long priority
 286                       , int update_every, RRDSET_TYPE chart_type) {
 287
 288     if(!type || !type[0]) {
 289         fatal("Cannot create rrd stats without a type.");
 290         return NULL;
 291     }
 292
 293     if(!id || !id[0]) {
 294         fatal("Cannot create rrd stats without an id.");
 295         return NULL;
 296     }
 297
 298     // ------------------------------------------------------------------------
 299     // check if it already exists
 300
 301     char fullid[RRD_ID_LENGTH_MAX + 1];
 302     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 303
 304     RRDSET *st = rrdset_find(host, fullid);
 305     if(st) {
 306         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 307         return st;
 308     }
 309
 310     char fullfilename[FILENAME_MAX + 1];
 311
 312     // ------------------------------------------------------------------------
 313     // compose the config_section for this chart
 314
 315     char config_section[RRD_ID_LENGTH_MAX + 1];
 316     if(host == localhost)
 317         strcpy(config_section, fullid);
 318     else
 319         snprintfz(config_section, RRD_ID_LENGTH_MAX, "%s/%s", host->machine_guid, fullid);
 320
 321     // ------------------------------------------------------------------------
 322     // get the options from the config, we need to create it
 323
 324     long rentries = config_get_number(config_section, "history", host->rrd_history_entries);
 325     long entries = align_entries_to_pagesize(rentries);
 326     if(entries != rentries) entries = config_set_number(config_section, "history", entries);
 327
 328     int enabled = config_get_boolean(config_section, "enabled", 1);
 329     if(!enabled) entries = 5;
 330
 331     unsigned long size = sizeof(RRDSET);
 332     char *cache_dir = rrdset_cache_dir(host, fullid, config_section);
 333
 334     // ------------------------------------------------------------------------
 335     // load it or allocate it
 336
 337     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 338
 339     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 340     if(host->rrd_memory_mode != RRD_MEMORY_MODE_RAM) {
 341         st = (RRDSET *) mymmap(fullfilename, size, ((host->rrd_memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 0);
 342         if(st) {
 343             memset(&st->avl, 0, sizeof(avl));
 344             memset(&st->avlname, 0, sizeof(avl));
 345             memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 346             memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 347             memset(&st->rrdset_rwlock, 0, sizeof(pthread_rwlock_t));
 348
 349             st->name = NULL;
 350             st->type = NULL;
 351             st->family = NULL;
 352             st->context = NULL;
 353             st->title = NULL;
 354             st->units = NULL;
 355             st->dimensions = NULL;
 356             st->next = NULL;
 357             st->variables = NULL;
 358             st->alarms = NULL;
 359             st->flags = 0x00000000;
 360
 361             if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 362                 errno = 0;
 363                 info("Initializing file %s.", fullfilename);
 364                 memset(st, 0, size);
 365             }
 366             else if(strcmp(st->id, fullid) != 0) {
 367                 errno = 0;
 368                 error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 369                 // munmap(st, size);
 370                 // st = NULL;
 371                 memset(st, 0, size);
 372             }
 373             else if(st->memsize != size || st->entries != entries) {
 374                 errno = 0;
 375                 error("File %s does not have the desired size. Clearing it.", fullfilename);
 376                 memset(st, 0, size);
 377             }
 378             else if(st->update_every != update_every) {
 379                 errno = 0;
 380                 error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 381                 memset(st, 0, size);
 382             }
 383             else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 384                 errno = 0;
 385                 error("File %s is too old. Clearing it.", fullfilename);
 386                 memset(st, 0, size);
 387             }
 388
 389             // make sure the database is aligned
 390             if(st->last_updated.tv_sec)
 391                 timeval_align(&st->last_updated, update_every);
 392
 393             // make sure we have the right memory mode
 394             // even if we cleared the memory
 395             st->rrd_memory_mode = host->rrd_memory_mode;
 396         }
 397     }
 398
 399     if(unlikely(!st)) {
 400         st = callocz(1, size);
 401         st->rrd_memory_mode = RRD_MEMORY_MODE_RAM;
 402     }
 403
 404     st->config_section = strdup(config_section);
 405     st->rrdhost = host;
 406     st->memsize = size;
 407     st->entries = entries;
 408     st->update_every = update_every;
 409
 410     if(st->current_entry >= st->entries) st->current_entry = 0;
 411
 412     strcpy(st->cache_filename, fullfilename);
 413     strcpy(st->magic, RRDSET_MAGIC);
 414
 415     strcpy(st->id, fullid);
 416     st->hash = simple_hash(st->id);
 417
 418     st->cache_dir = cache_dir;
 419
 420     st->chart_type = rrdset_type_id(config_get(st->config_section, "chart type", rrdset_type_name(chart_type)));
 421     st->type       = config_get(st->config_section, "type", type);
 422     st->family     = config_get(st->config_section, "family", family?family:st->type);
 423     st->units      = config_get(st->config_section, "units", units?units:"");
 424
 425     st->context    = config_get(st->config_section, "context", context?context:st->id);
 426     st->hash_context = simple_hash(st->context);
 427
 428     st->priority = config_get_number(st->config_section, "priority", priority);
 429     if(enabled)
 430         rrdset_flag_set(st, RRDSET_FLAG_ENABLED);
 431     else
 432         rrdset_flag_clear(st, RRDSET_FLAG_ENABLED);
 433
 434     rrdset_flag_clear(st, RRDSET_FLAG_DETAIL);
 435     rrdset_flag_clear(st, RRDSET_FLAG_DEBUG);
 436
 437     // if(!strcmp(st->id, "disk_util.dm-0")) {
 438     //     st->debug = 1;
 439     //     error("enabled debugging for '%s'", st->id);
 440     // }
 441     // else error("not enabled debugging for '%s'", st->id);
 442
 443     st->green = NAN;
 444     st->red = NAN;
 445
 446     st->last_collected_time.tv_sec = 0;
 447     st->last_collected_time.tv_usec = 0;
 448     st->counter_done = 0;
 449
 450     st->gap_when_lost_iterations_above = (int) (
 451             config_get_number(st->config_section, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 452
 453     avl_init_lock(&st->dimensions_index, rrddim_compare);
 454     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 455
 456     pthread_rwlock_init(&st->rrdset_rwlock, NULL);
 457     rrdhost_wrlock(host);
 458
 459     if(name && *name) rrdset_set_name(st, name);
 460     else rrdset_set_name(st, id);
 461
 462     {
 463         char varvalue[CONFIG_MAX_VALUE + 1];
 464         char varvalue2[CONFIG_MAX_VALUE + 1];
 465         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 466         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 467         st->title = config_get(st->config_section, "title", varvalue2);
 468     }
 469
 470     st->rrdfamily = rrdfamily_create(host, st->family);
 471
 472     st->next = host->rrdset_root;
 473     host->rrdset_root = st;
 474
 475     if(host->health_enabled) {
 476         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 477         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 478         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 479         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 480         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 481     }
 482
 483     if(unlikely(rrdset_index_add(host, st) != st))
 484         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 485
 486     rrdsetcalc_link_matching(st);
 487     rrdcalctemplate_link_matching(st);
 488
 489     rrdhost_unlock(host);
 490
 491     return(st);
 492 }
 493
 494
 495 // ----------------------------------------------------------------------------
 496 // RRDSET - data collection iteration control
 497
 498 void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds) {
 499     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
 500         // the first entry
 501         microseconds = st->update_every * USEC_PER_SEC;
 502     }
 503     st->usec_since_last_update = microseconds;
 504 }
 505
 506 void rrdset_next_usec(RRDSET *st, usec_t microseconds)
 507 {
 508     struct timeval now;
 509     now_realtime_timeval(&now);
 510
 511     if(unlikely(!st->last_collected_time.tv_sec)) {
 512         // the first entry
 513         microseconds = st->update_every * USEC_PER_SEC;
 514     }
 515     else if(unlikely(!microseconds)) {
 516         // no dt given by the plugin
 517         microseconds = dt_usec(&now, &st->last_collected_time);
 518     }
 519     else {
 520         // microseconds has the time since the last collection
 521 //#ifdef NETDATA_INTERNAL_CHECKS
 522 //        usec_t now_usec = timeval_usec(&now);
 523 //        usec_t last_usec = timeval_usec(&st->last_collected_time);
 524 //#endif
 525         usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
 526
 527         // verify the microseconds given is good
 528         if(unlikely(microseconds > since_last_usec)) {
 529             debug(D_RRD_CALLS, "dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
 530
 531 //#ifdef NETDATA_INTERNAL_CHECKS
 532 //            if(unlikely(last_usec + microseconds > now_usec + 1000))
 533 //                error("dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
 534 //#endif
 535
 536             microseconds = since_last_usec;
 537         }
 538         else if(unlikely(microseconds < since_last_usec * 0.8)) {
 539             debug(D_RRD_CALLS, "dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
 540
 541 //#ifdef NETDATA_INTERNAL_CHECKS
 542 //            error("dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
 543 //#endif
 544             microseconds = since_last_usec;
 545         }
 546     }
 547     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 548
 549     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 550         debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 551
 552     st->usec_since_last_update = microseconds;
 553 }
 554
 555
 556 // ----------------------------------------------------------------------------
 557 // RRDSET - process the collected values for all dimensions of a chart
 558
 559 void rrdset_done(RRDSET *st) {
 560     if(unlikely(netdata_exit)) return;
 561     if(unlikely(central_netdata_to_push_data)) {
 562         rrdset_done_push(st);
 563         return;
 564     }
 565
 566     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 567
 568     RRDDIM *rd;
 569
 570     int
 571             pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
 572
 573     char
 574             store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
 575             first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
 576
 577     unsigned int
 578             stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
 579
 580     usec_t
 581             last_collect_ut,        // the timestamp in microseconds, of the last collected value
 582             now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
 583             last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
 584             next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
 585             update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
 586
 587     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
 588         error("Cannot set pthread cancel state to DISABLE.");
 589
 590     // a read lock is OK here
 591     rrdset_rdlock(st);
 592
 593 /*
 594     // enable the chart, if it was disabled
 595     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 596         st->enabled = 1;
 597 */
 598
 599     // check if the chart has a long time to be updated
 600     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
 601         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 602         rrdset_reset(st);
 603         st->usec_since_last_update = update_every_ut;
 604         first_entry = 1;
 605     }
 606
 607     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 608         debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 609
 610     // set last_collected_time
 611     if(unlikely(!st->last_collected_time.tv_sec)) {
 612         // it is the first entry
 613         // set the last_collected_time to now
 614         now_realtime_timeval(&st->last_collected_time);
 615         timeval_align(&st->last_collected_time, st->update_every);
 616
 617         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
 618
 619         // the first entry should not be stored
 620         store_this_entry = 0;
 621         first_entry = 1;
 622
 623         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 624             debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
 625     }
 626     else {
 627         // it is not the first entry
 628         // calculate the proper last_collected_time, using usec_since_last_update
 629         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 630         usec_t ut = last_collect_ut + st->usec_since_last_update;
 631         st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
 632         st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 633     }
 634
 635     // if this set has not been updated in the past
 636     // we fake the last_update time to be = now - usec_since_last_update
 637     if(unlikely(!st->last_updated.tv_sec)) {
 638         // it has never been updated before
 639         // set a fake last_updated, in the past using usec_since_last_update
 640         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
 641         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
 642         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 643
 644         // the first entry should not be stored
 645         store_this_entry = 0;
 646         first_entry = 1;
 647
 648         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 649             debug(D_RRD_STATS, "%s: initializing last_updated to now - %llu microseconds (%0.3Lf). Will not store the next entry.", st->name, st->usec_since_last_update, (long double)ut/1000000.0);
 650     }
 651
 652     // check if we will re-write the entire data set
 653     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
 654         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);
 655         rrdset_reset(st);
 656
 657         st->usec_since_last_update = update_every_ut;
 658
 659         now_realtime_timeval(&st->last_collected_time);
 660         timeval_align(&st->last_collected_time, st->update_every);
 661
 662         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
 663         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
 664         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
 665
 666         // the first entry should not be stored
 667         store_this_entry = 0;
 668         first_entry = 1;
 669     }
 670
 671     // these are the 3 variables that will help us in interpolation
 672     // last_stored_ut = the last time we added a value to the storage
 673     // now_collect_ut = the time the current value has been collected
 674     // next_store_ut  = the time of the next interpolation point
 675     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
 676     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
 677     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
 678
 679     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 680         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
 681         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
 682         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 683         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 684     }
 685
 686     if(unlikely(!st->counter_done)) {
 687         store_this_entry = 0;
 688         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 689             debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
 690     }
 691     st->counter_done++;
 692
 693     // calculate totals and count the dimensions
 694     int dimensions = 0;
 695     st->collected_total = 0;
 696     rrddim_foreach_read(rd, st) {
 697         dimensions++;
 698         if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
 699             st->collected_total += rd->collected_value;
 700     }
 701
 702     uint32_t storage_flags = SN_EXISTS;
 703
 704     // process all dimensions to calculate their values
 705     // based on the collected figures only
 706     // at this stage we do not interpolate anything
 707     rrddim_foreach_read(rd, st) {
 708
 709         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED))) {
 710             rd->calculated_value = 0;
 711             continue;
 712         }
 713
 714         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 715             debug(D_RRD_STATS, "%s/%s: START "
 716                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 717                     " collected_value = " COLLECTED_NUMBER_FORMAT
 718                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 719                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 720                                       , st->id, rd->name
 721                                       , rd->last_collected_value
 722                                       , rd->collected_value
 723                                       , rd->last_calculated_value
 724                                       , rd->calculated_value
 725             );
 726
 727         switch(rd->algorithm) {
 728             case RRD_ALGORITHM_ABSOLUTE:
 729                 rd->calculated_value = (calculated_number)rd->collected_value
 730                                        * (calculated_number)rd->multiplier
 731                                        / (calculated_number)rd->divisor;
 732
 733                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 734                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
 735                             CALCULATED_NUMBER_FORMAT " = "
 736                             COLLECTED_NUMBER_FORMAT
 737                             " * " CALCULATED_NUMBER_FORMAT
 738                             " / " CALCULATED_NUMBER_FORMAT
 739                           , st->id, rd->name
 740                           , rd->calculated_value
 741                           , rd->collected_value
 742                           , (calculated_number)rd->multiplier
 743                           , (calculated_number)rd->divisor
 744                     );
 745                 break;
 746
 747             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 748                 if(unlikely(!st->collected_total))
 749                     rd->calculated_value = 0;
 750                 else
 751                     // the percentage of the current value
 752                     // over the total of all dimensions
 753                     rd->calculated_value =
 754                             (calculated_number)100
 755                             * (calculated_number)rd->collected_value
 756                             / (calculated_number)st->collected_total;
 757
 758                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 759                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
 760                             CALCULATED_NUMBER_FORMAT " = 100"
 761                                     " * " COLLECTED_NUMBER_FORMAT
 762                             " / " COLLECTED_NUMBER_FORMAT
 763                           , st->id, rd->name
 764                           , rd->calculated_value
 765                           , rd->collected_value
 766                           , st->collected_total
 767                     );
 768                 break;
 769
 770             case RRD_ALGORITHM_INCREMENTAL:
 771                 if(unlikely(rd->counter <= 1)) {
 772                     rd->calculated_value = 0;
 773                     continue;
 774                 }
 775
 776                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 777                 // to reset the calculation (it will give zero as the calculation for this second)
 778                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 779                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 780                           , st->name, rd->name
 781                           , rd->last_collected_value
 782                           , rd->collected_value);
 783
 784                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 785                         storage_flags = SN_EXISTS_RESET;
 786
 787                     rd->last_collected_value = rd->collected_value;
 788                 }
 789
 790                 rd->calculated_value +=
 791                         (calculated_number)(rd->collected_value - rd->last_collected_value)
 792                         * (calculated_number)rd->multiplier
 793                         / (calculated_number)rd->divisor;
 794
 795                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 796                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
 797                             CALCULATED_NUMBER_FORMAT " = ("
 798                             COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
 799                             ")"
 800                                     " * " CALCULATED_NUMBER_FORMAT
 801                             " / " CALCULATED_NUMBER_FORMAT
 802                           , st->id, rd->name
 803                           , rd->calculated_value
 804                           , rd->collected_value, rd->last_collected_value
 805                           , (calculated_number)rd->multiplier
 806                           , (calculated_number)rd->divisor
 807                     );
 808                 break;
 809
 810             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 811                 if(unlikely(rd->counter <= 1)) {
 812                     rd->calculated_value = 0;
 813                     continue;
 814                 }
 815
 816                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
 817                 // to reset the calculation (it will give zero as the calculation for this second)
 818                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
 819                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
 820                           , st->name, rd->name
 821                           , rd->last_collected_value
 822                           , rd->collected_value);
 823
 824                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
 825                         storage_flags = SN_EXISTS_RESET;
 826
 827                     rd->last_collected_value = rd->collected_value;
 828                 }
 829
 830                 // the percentage of the current increment
 831                 // over the increment of all dimensions together
 832                 if(unlikely(st->collected_total == st->last_collected_total))
 833                     rd->calculated_value = 0;
 834                 else
 835                     rd->calculated_value =
 836                             (calculated_number)100
 837                             * (calculated_number)(rd->collected_value - rd->last_collected_value)
 838                             / (calculated_number)(st->collected_total - st->last_collected_total);
 839
 840                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 841                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
 842                             CALCULATED_NUMBER_FORMAT " = 100"
 843                                     " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 844                                     " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
 845                           , st->id, rd->name
 846                           , rd->calculated_value
 847                           , rd->collected_value, rd->last_collected_value
 848                           , st->collected_total, st->last_collected_total
 849                     );
 850                 break;
 851
 852             default:
 853                 // make the default zero, to make sure
 854                 // it gets noticed when we add new types
 855                 rd->calculated_value = 0;
 856
 857                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 858                     debug(D_RRD_STATS, "%s/%s: CALC "
 859                             CALCULATED_NUMBER_FORMAT " = 0"
 860                           , st->id, rd->name
 861                           , rd->calculated_value
 862                     );
 863                 break;
 864         }
 865
 866         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 867             debug(D_RRD_STATS, "%s/%s: PHASE2 "
 868                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
 869                     " collected_value = " COLLECTED_NUMBER_FORMAT
 870                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 871                     " calculated_value = " CALCULATED_NUMBER_FORMAT
 872                                       , st->id, rd->name
 873                                       , rd->last_collected_value
 874                                       , rd->collected_value
 875                                       , rd->last_calculated_value
 876                                       , rd->calculated_value
 877             );
 878
 879     }
 880
 881     // at this point we have all the calculated values ready
 882     // it is now time to interpolate values on a second boundary
 883
 884     if(unlikely(now_collect_ut < next_store_ut)) {
 885         // this is collected in the same interpolation point
 886
 887         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 888             debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
 889
 890 //#ifdef NETDATA_INTERNAL_CHECKS
 891 //        info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
 892 //#endif
 893     }
 894
 895     usec_t first_ut = last_stored_ut;
 896     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
 897     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
 898
 899     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
 900 //#ifdef NETDATA_INTERNAL_CHECKS
 901 //        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); }
 902 //#endif
 903
 904         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
 905             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
 906             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
 907         }
 908
 909         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
 910         st->last_updated.tv_usec = 0;
 911
 912         rrddim_foreach_read(rd, st) {
 913             calculated_number new_value;
 914
 915             switch(rd->algorithm) {
 916                 case RRD_ALGORITHM_INCREMENTAL:
 917                     new_value = (calculated_number)
 918                             (      rd->calculated_value
 919                                    * (calculated_number)(next_store_ut - last_collect_ut)
 920                                    / (calculated_number)(now_collect_ut - last_collect_ut)
 921                             );
 922
 923                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 924                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
 925                                 CALCULATED_NUMBER_FORMAT " = "
 926                                 CALCULATED_NUMBER_FORMAT
 927                                 " * %llu"
 928                                         " / %llu"
 929                               , st->id, rd->name
 930                               , new_value
 931                               , rd->calculated_value
 932                               , (next_store_ut - last_stored_ut)
 933                               , (now_collect_ut - last_stored_ut)
 934                         );
 935
 936                     rd->calculated_value -= new_value;
 937                     new_value += rd->last_calculated_value;
 938                     rd->last_calculated_value = 0;
 939                     new_value /= (calculated_number)st->update_every;
 940
 941                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
 942                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 943                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
 944                                     st->id, rd->name
 945                                   , (calculated_number)(next_store_ut - last_stored_ut)
 946                             );
 947                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
 948                     }
 949                     break;
 950
 951                 case RRD_ALGORITHM_ABSOLUTE:
 952                 case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 953                 case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 954                 default:
 955                     if(iterations == 1) {
 956                         // this is the last iteration
 957                         // do not interpolate
 958                         // just show the calculated value
 959
 960                         new_value = rd->calculated_value;
 961                     }
 962                     else {
 963                         // we have missed an update
 964                         // interpolate in the middle values
 965
 966                         new_value = (calculated_number)
 967                                 (   (     (rd->calculated_value - rd->last_calculated_value)
 968                                           * (calculated_number)(next_store_ut - last_collect_ut)
 969                                           / (calculated_number)(now_collect_ut - last_collect_ut)
 970                                     )
 971                                     +  rd->last_calculated_value
 972                                 );
 973
 974                         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
 975                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
 976                                     CALCULATED_NUMBER_FORMAT " = ((("
 977                                             "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
 978                                             " * %llu"
 979                                             " / %llu) + " CALCULATED_NUMBER_FORMAT
 980                                   , st->id, rd->name
 981                                   , new_value
 982                                   , rd->calculated_value, rd->last_calculated_value
 983                                   , (next_store_ut - first_ut)
 984                                   , (now_collect_ut - first_ut), rd->last_calculated_value
 985                             );
 986                     }
 987                     break;
 988             }
 989
 990             if(unlikely(!store_this_entry)) {
 991                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 992                 continue;
 993             }
 994
 995             if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED) && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
 996                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
 997                 rd->last_stored_value = new_value;
 998
 999                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1000                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1001                             CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1002                           , st->id, rd->name
1003                           , st->current_entry
1004                           , unpack_storage_number(rd->values[st->current_entry]), new_value
1005                     );
1006             }
1007             else {
1008                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1009                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1010                           , st->id, rd->name
1011                           , st->current_entry
1012                     );
1013                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1014                 rd->last_stored_value = NAN;
1015             }
1016
1017             stored_entries++;
1018
1019             if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG))) {
1020                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1021                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1022                 calculated_number accuracy = accuracy_loss(t1, t2);
1023                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1024                       , st->id, rd->name
1025                       , st->current_entry
1026                       , t2
1027                       , get_storage_number_flags(rd->values[st->current_entry])
1028                       , t1
1029                       , accuracy
1030                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1031                 );
1032
1033                 rd->collected_volume += t1;
1034                 rd->stored_volume += t2;
1035                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1036                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1037                       , st->id, rd->name
1038                       , st->current_entry
1039                       , rd->stored_volume
1040                       , rd->collected_volume
1041                       , accuracy
1042                       , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1043                 );
1044
1045             }
1046         }
1047         // reset the storage flags for the next point, if any;
1048         storage_flags = SN_EXISTS;
1049
1050         st->counter++;
1051         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1052         last_stored_ut = next_store_ut;
1053     }
1054
1055     st->last_collected_total  = st->collected_total;
1056
1057     rrddim_foreach_read(rd, st) {
1058         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
1059             continue;
1060
1061         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1062             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);
1063
1064         rd->last_collected_value = rd->collected_value;
1065
1066         switch(rd->algorithm) {
1067             case RRD_ALGORITHM_INCREMENTAL:
1068                 if(unlikely(!first_entry)) {
1069                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1070                         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);
1071                     rd->last_calculated_value += rd->calculated_value;
1072                 }
1073                 else {
1074                     if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1075                         debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1076                 }
1077                 break;
1078
1079             case RRD_ALGORITHM_ABSOLUTE:
1080             case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1081             case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1082                 if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1083                     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);
1084                 rd->last_calculated_value = rd->calculated_value;
1085                 break;
1086         }
1087
1088         rd->calculated_value = 0;
1089         rd->collected_value = 0;
1090         rrddim_flag_clear(rd, RRDDIM_FLAG_UPDATED);
1091
1092         if(unlikely(rrdset_flag_check(st, RRDSET_FLAG_DEBUG)))
1093             debug(D_RRD_STATS, "%s/%s: END "
1094                     " last_collected_value = " COLLECTED_NUMBER_FORMAT
1095                     " collected_value = " COLLECTED_NUMBER_FORMAT
1096                     " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1097                     " calculated_value = " CALCULATED_NUMBER_FORMAT
1098                                       , st->id, rd->name
1099                                       , rd->last_collected_value
1100                                       , rd->collected_value
1101                                       , rd->last_calculated_value
1102                                       , rd->calculated_value
1103             );
1104     }
1105
1106     // ALL DONE ABOUT THE DATA UPDATE
1107     // --------------------------------------------------------------------
1108
1109 /*
1110     // find if there are any obsolete dimensions (not updated recently)
1111     if(unlikely(rrd_delete_unupdated_dimensions)) {
1112
1113         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1114             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1115                 break;
1116
1117         if(unlikely(rd)) {
1118             RRDDIM *last;
1119             // there is dimension to free
1120             // upgrade our read lock to a write lock
1121             pthread_rwlock_unlock(&st->rrdset_rwlock);
1122             pthread_rwlock_wrlock(&st->rrdset_rwlock);
1123
1124             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1125                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1126
1127                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1128                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1129
1130                     if(unlikely(!last)) {
1131                         st->dimensions = rd->next;
1132                         rd->next = NULL;
1133                         rrddim_free(st, rd);
1134                         rd = st->dimensions;
1135                         continue;
1136                     }
1137                     else {
1138                         last->next = rd->next;
1139                         rd->next = NULL;
1140                         rrddim_free(st, rd);
1141                         rd = last->next;
1142                         continue;
1143                     }
1144                 }
1145
1146                 last = rd;
1147                 rd = rd->next;
1148             }
1149
1150             if(unlikely(!st->dimensions)) {
1151                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1152                 st->enabled = 0;
1153             }
1154         }
1155     }
1156 */
1157
1158     rrdset_unlock(st);
1159
1160     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1161         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1162 }
1163