src/rrdset.c

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