src/rrd.c

   1 #include "common.h"
   2
   3 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
   4
   5 // ----------------------------------------------------------------------------
   6 // globals
   7
   8 /*
   9 // if not zero it gives the time (in seconds) to remove un-updated dimensions
  10 // DO NOT ENABLE
  11 // if dimensions are removed, the chart generation will have to run again
  12 int rrd_delete_unupdated_dimensions = 0;
  13 */
  14
  15 int rrd_update_every = UPDATE_EVERY;
  16 int rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
  17 int rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
  18
  19 static int rrdset_compare(void* a, void* b);
  20 static int rrdset_compare_name(void* a, void* b);
  21 static int rrdfamily_compare(void *a, void *b);
  22
  23 // ----------------------------------------------------------------------------
  24 // RRDHOST
  25
  26 RRDHOST localhost = {
  27         .hostname = "localhost",
  28         .rrdset_root = NULL,
  29         .rrdset_root_rwlock = PTHREAD_RWLOCK_INITIALIZER,
  30         .rrdset_root_index = {
  31             { NULL, rrdset_compare },
  32             AVL_LOCK_INITIALIZER
  33         },
  34         .rrdset_root_index_name = {
  35             { NULL, rrdset_compare_name },
  36             AVL_LOCK_INITIALIZER
  37         },
  38         .rrdfamily_root_index = {
  39             { NULL, rrdfamily_compare },
  40             AVL_LOCK_INITIALIZER
  41         },
  42         .variables_root_index = {
  43             { NULL, rrdvar_compare },
  44             AVL_LOCK_INITIALIZER
  45         },
  46         .health_log = {
  47             .next_log_id = 1,
  48             .next_alarm_id = 1,
  49             .count = 0,
  50             .max = 1000,
  51             .alarms = NULL,
  52             .alarm_log_rwlock = PTHREAD_RWLOCK_INITIALIZER
  53         }
  54 };
  55
  56 void rrdhost_init(char *hostname) {
  57     localhost.hostname = hostname;
  58     localhost.health_log.next_log_id =
  59         localhost.health_log.next_alarm_id = now_realtime_sec();
  60 }
  61
  62 void rrdhost_rwlock(RRDHOST *host) {
  63     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
  64 }
  65
  66 void rrdhost_rdlock(RRDHOST *host) {
  67     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
  68 }
  69
  70 void rrdhost_unlock(RRDHOST *host) {
  71     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
  72 }
  73
  74 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
  75     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
  76
  77     if(ret == 0)
  78         fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
  79 }
  80
  81 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
  82     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
  83
  84     if(ret == 0)
  85         fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
  86 }
  87
  88 // ----------------------------------------------------------------------------
  89 // RRDFAMILY index
  90
  91 static int rrdfamily_compare(void *a, void *b) {
  92     if(((RRDFAMILY *)a)->hash_family < ((RRDFAMILY *)b)->hash_family) return -1;
  93     else if(((RRDFAMILY *)a)->hash_family > ((RRDFAMILY *)b)->hash_family) return 1;
  94     else return strcmp(((RRDFAMILY *)a)->family, ((RRDFAMILY *)b)->family);
  95 }
  96
  97 #define rrdfamily_index_add(host, rc) (RRDFAMILY *)avl_insert_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
  98 #define rrdfamily_index_del(host, rc) (RRDFAMILY *)avl_remove_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
  99
 100 static RRDFAMILY *rrdfamily_index_find(RRDHOST *host, const char *id, uint32_t hash) {
 101     RRDFAMILY tmp;
 102     tmp.family = id;
 103     tmp.hash_family = (hash)?hash:simple_hash(tmp.family);
 104
 105     return (RRDFAMILY *)avl_search_lock(&(host->rrdfamily_root_index), (avl *) &tmp);
 106 }
 107
 108 RRDFAMILY *rrdfamily_create(const char *id) {
 109     RRDFAMILY *rc = rrdfamily_index_find(&localhost, id, 0);
 110     if(!rc) {
 111         rc = callocz(1, sizeof(RRDFAMILY));
 112
 113         rc->family = strdupz(id);
 114         rc->hash_family = simple_hash(rc->family);
 115
 116         // initialize the variables index
 117         avl_init_lock(&rc->variables_root_index, rrdvar_compare);
 118
 119         RRDFAMILY *ret = rrdfamily_index_add(&localhost, rc);
 120         if(ret != rc)
 121             fatal("RRDFAMILY: INTERNAL ERROR: Expected to INSERT RRDFAMILY '%s' into index, but inserted '%s'.", rc->family, (ret)?ret->family:"NONE");
 122     }
 123
 124     rc->use_count++;
 125     return rc;
 126 }
 127
 128 void rrdfamily_free(RRDFAMILY *rc) {
 129     rc->use_count--;
 130     if(!rc->use_count) {
 131         RRDFAMILY *ret = rrdfamily_index_del(&localhost, rc);
 132         if(ret != rc)
 133             fatal("RRDFAMILY: INTERNAL ERROR: Expected to DELETE RRDFAMILY '%s' from index, but deleted '%s'.", rc->family, (ret)?ret->family:"NONE");
 134
 135         if(rc->variables_root_index.avl_tree.root != NULL)
 136             fatal("RRDFAMILY: INTERNAL ERROR: Variables index of RRDFAMILY '%s' that is freed, is not empty.", rc->family);
 137
 138         freez((void *)rc->family);
 139         freez(rc);
 140     }
 141 }
 142
 143 // ----------------------------------------------------------------------------
 144 // RRDSET index
 145
 146 static int rrdset_compare(void* a, void* b) {
 147     if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
 148     else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
 149     else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
 150 }
 151
 152 #define rrdset_index_add(host, st) (RRDSET *)avl_insert_lock(&((host)->rrdset_root_index), (avl *)(st))
 153 #define rrdset_index_del(host, st) (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index), (avl *)(st))
 154
 155 static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
 156     RRDSET tmp;
 157     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 158     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 159
 160     return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // RRDSET name index
 165
 166 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
 167
 168 static int rrdset_compare_name(void* a, void* b) {
 169     RRDSET *A = rrdset_from_avlname(a);
 170     RRDSET *B = rrdset_from_avlname(b);
 171
 172     // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
 173
 174     if(A->hash_name < B->hash_name) return -1;
 175     else if(A->hash_name > B->hash_name) return 1;
 176     else return strcmp(A->name, B->name);
 177 }
 178
 179 RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
 180     void *result;
 181     // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
 182     result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
 183     if(result) return rrdset_from_avlname(result);
 184     return NULL;
 185 }
 186
 187 RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
 188     void *result;
 189     // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
 190     result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
 191     if(result) return rrdset_from_avlname(result);
 192     return NULL;
 193 }
 194
 195 static RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
 196     void *result = NULL;
 197     RRDSET tmp;
 198     tmp.name = name;
 199     tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
 200
 201     // fprintf(stderr, "SEARCHING: %s\n", name);
 202     result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
 203     if(result) {
 204         RRDSET *st = rrdset_from_avlname(result);
 205         if(strcmp(st->magic, RRDSET_MAGIC))
 206             error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
 207
 208         // fprintf(stderr, "FOUND: %s\n", name);
 209         return rrdset_from_avlname(result);
 210     }
 211     // fprintf(stderr, "NOT FOUND: %s\n", name);
 212     return NULL;
 213 }
 214
 215
 216 // ----------------------------------------------------------------------------
 217 // RRDDIM index
 218
 219 static int rrddim_compare(void* a, void* b) {
 220     if(((RRDDIM *)a)->hash < ((RRDDIM *)b)->hash) return -1;
 221     else if(((RRDDIM *)a)->hash > ((RRDDIM *)b)->hash) return 1;
 222     else return strcmp(((RRDDIM *)a)->id, ((RRDDIM *)b)->id);
 223 }
 224
 225 #define rrddim_index_add(st, rd) (RRDDIM *)avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
 226 #define rrddim_index_del(st,rd ) (RRDDIM *)avl_remove_lock(&((st)->dimensions_index), (avl *)(rd))
 227
 228 static RRDDIM *rrddim_index_find(RRDSET *st, const char *id, uint32_t hash) {
 229     RRDDIM tmp;
 230     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 231     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 232
 233     return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // chart types
 238
 239 int rrdset_type_id(const char *name)
 240 {
 241     if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0)) return RRDSET_TYPE_AREA;
 242     else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0)) return RRDSET_TYPE_STACKED;
 243     else if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0)) return RRDSET_TYPE_LINE;
 244     return RRDSET_TYPE_LINE;
 245 }
 246
 247 const char *rrdset_type_name(int chart_type)
 248 {
 249     static char line[] = RRDSET_TYPE_LINE_NAME;
 250     static char area[] = RRDSET_TYPE_AREA_NAME;
 251     static char stacked[] = RRDSET_TYPE_STACKED_NAME;
 252
 253     switch(chart_type) {
 254         case RRDSET_TYPE_LINE:
 255             return line;
 256
 257         case RRDSET_TYPE_AREA:
 258             return area;
 259
 260         case RRDSET_TYPE_STACKED:
 261             return stacked;
 262     }
 263     return line;
 264 }
 265
 266 // ----------------------------------------------------------------------------
 267 // load / save
 268
 269 const char *rrd_memory_mode_name(int id)
 270 {
 271     static const char ram[] = RRD_MEMORY_MODE_RAM_NAME;
 272     static const char map[] = RRD_MEMORY_MODE_MAP_NAME;
 273     static const char save[] = RRD_MEMORY_MODE_SAVE_NAME;
 274
 275     switch(id) {
 276         case RRD_MEMORY_MODE_RAM:
 277             return ram;
 278
 279         case RRD_MEMORY_MODE_MAP:
 280             return map;
 281
 282         case RRD_MEMORY_MODE_SAVE:
 283         default:
 284             return save;
 285     }
 286
 287     return save;
 288 }
 289
 290 int rrd_memory_mode_id(const char *name)
 291 {
 292     if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
 293         return RRD_MEMORY_MODE_RAM;
 294     else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
 295         return RRD_MEMORY_MODE_MAP;
 296
 297     return RRD_MEMORY_MODE_SAVE;
 298 }
 299
 300 // ----------------------------------------------------------------------------
 301 // algorithms types
 302
 303 int rrddim_algorithm_id(const char *name)
 304 {
 305     if(strcmp(name, RRDDIM_INCREMENTAL_NAME) == 0)              return RRDDIM_INCREMENTAL;
 306     if(strcmp(name, RRDDIM_ABSOLUTE_NAME) == 0)                 return RRDDIM_ABSOLUTE;
 307     if(strcmp(name, RRDDIM_PCENT_OVER_ROW_TOTAL_NAME) == 0)     return RRDDIM_PCENT_OVER_ROW_TOTAL;
 308     if(strcmp(name, RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)    return RRDDIM_PCENT_OVER_DIFF_TOTAL;
 309     return RRDDIM_ABSOLUTE;
 310 }
 311
 312 const char *rrddim_algorithm_name(int chart_type)
 313 {
 314     static char absolute[] = RRDDIM_ABSOLUTE_NAME;
 315     static char incremental[] = RRDDIM_INCREMENTAL_NAME;
 316     static char percentage_of_absolute_row[] = RRDDIM_PCENT_OVER_ROW_TOTAL_NAME;
 317     static char percentage_of_incremental_row[] = RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME;
 318
 319     switch(chart_type) {
 320         case RRDDIM_ABSOLUTE:
 321             return absolute;
 322
 323         case RRDDIM_INCREMENTAL:
 324             return incremental;
 325
 326         case RRDDIM_PCENT_OVER_ROW_TOTAL:
 327             return percentage_of_absolute_row;
 328
 329         case RRDDIM_PCENT_OVER_DIFF_TOTAL:
 330             return percentage_of_incremental_row;
 331     }
 332     return absolute;
 333 }
 334
 335 // ----------------------------------------------------------------------------
 336 // chart names
 337
 338 char *rrdset_strncpyz_name(char *to, const char *from, size_t length)
 339 {
 340     char c, *p = to;
 341
 342     while (length-- && (c = *from++)) {
 343         if(c != '.' && !isalnum(c))
 344             c = '_';
 345
 346         *p++ = c;
 347     }
 348
 349     *p = '\0';
 350
 351     return to;
 352 }
 353
 354 void rrdset_set_name(RRDSET *st, const char *name)
 355 {
 356     if(unlikely(st->name && !strcmp(st->name, name)))
 357         return;
 358
 359     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 360
 361     char b[CONFIG_MAX_VALUE + 1];
 362     char n[RRD_ID_LENGTH_MAX + 1];
 363
 364     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 365     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 366
 367     if(st->name) {
 368         rrdset_index_del_name(&localhost, st);
 369         st->name = config_set_default(st->id, "name", b);
 370         st->hash_name = simple_hash(st->name);
 371         rrdsetvar_rename_all(st);
 372     }
 373     else {
 374         st->name = config_get(st->id, "name", b);
 375         st->hash_name = simple_hash(st->name);
 376     }
 377
 378     pthread_rwlock_wrlock(&st->rwlock);
 379     RRDDIM *rd;
 380     for(rd = st->dimensions; rd ;rd = rd->next)
 381         rrddimvar_rename_all(rd);
 382     pthread_rwlock_unlock(&st->rwlock);
 383
 384     if(unlikely(rrdset_index_add_name(&localhost, st) != st))
 385         error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
 386 }
 387
 388 // ----------------------------------------------------------------------------
 389 // cache directory
 390
 391 char *rrdset_cache_dir(const char *id)
 392 {
 393     char *ret = NULL;
 394
 395     char b[FILENAME_MAX + 1];
 396     char n[FILENAME_MAX + 1];
 397     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 398
 399     snprintfz(n, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, b);
 400     ret = config_get(id, "cache directory", n);
 401
 402     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 403         int r = mkdir(ret, 0775);
 404         if(r != 0 && errno != EEXIST)
 405             error("Cannot create directory '%s'", ret);
 406     }
 407
 408     return ret;
 409 }
 410
 411 // ----------------------------------------------------------------------------
 412 // core functions
 413
 414 void rrdset_reset(RRDSET *st)
 415 {
 416     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 417
 418     st->last_collected_time.tv_sec = 0;
 419     st->last_collected_time.tv_usec = 0;
 420     st->last_updated.tv_sec = 0;
 421     st->last_updated.tv_usec = 0;
 422     st->current_entry = 0;
 423     st->counter = 0;
 424     st->counter_done = 0;
 425
 426     RRDDIM *rd;
 427     for(rd = st->dimensions; rd ; rd = rd->next) {
 428         rd->last_collected_time.tv_sec = 0;
 429         rd->last_collected_time.tv_usec = 0;
 430         rd->counter = 0;
 431         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 432     }
 433 }
 434 static inline long align_entries_to_pagesize(long entries) {
 435     if(entries < 5) entries = 5;
 436     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 437
 438 #ifdef NETDATA_LOG_ALLOCATIONS
 439     long page = (size_t)sysconf(_SC_PAGESIZE);
 440
 441     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 442     if(size % page) {
 443         size -= (size % page);
 444         size += page;
 445
 446         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 447         return n;
 448     }
 449
 450     return entries;
 451 #else
 452     return entries;
 453 #endif
 454 }
 455
 456 static inline void timeval_align(struct timeval *tv, int update_every) {
 457     tv->tv_sec -= tv->tv_sec % update_every;
 458     tv->tv_usec = 500000;
 459 }
 460
 461 RRDSET *rrdset_create(const char *type, const char *id, const char *name, const char *family, const char *context, const char *title, const char *units, long priority, int update_every, int chart_type)
 462 {
 463     if(!type || !type[0]) {
 464         fatal("Cannot create rrd stats without a type.");
 465         return NULL;
 466     }
 467
 468     if(!id || !id[0]) {
 469         fatal("Cannot create rrd stats without an id.");
 470         return NULL;
 471     }
 472
 473     char fullid[RRD_ID_LENGTH_MAX + 1];
 474     char fullfilename[FILENAME_MAX + 1];
 475
 476     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 477
 478     RRDSET *st = rrdset_find(fullid);
 479     if(st) {
 480         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 481         return st;
 482     }
 483
 484     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 485     long entries = align_entries_to_pagesize(rentries);
 486     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 487
 488     int enabled = config_get_boolean(fullid, "enabled", 1);
 489     if(!enabled) entries = 5;
 490
 491     unsigned long size = sizeof(RRDSET);
 492     char *cache_dir = rrdset_cache_dir(fullid);
 493
 494     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 495
 496     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 497     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM) st = (RRDSET *)mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP)?MAP_SHARED:MAP_PRIVATE), 0);
 498     if(st) {
 499         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 500             errno = 0;
 501             info("Initializing file %s.", fullfilename);
 502             memset(st, 0, size);
 503         }
 504         else if(strcmp(st->id, fullid) != 0) {
 505             errno = 0;
 506             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 507             // munmap(st, size);
 508             // st = NULL;
 509             memset(st, 0, size);
 510         }
 511         else if(st->memsize != size || st->entries != entries) {
 512             errno = 0;
 513             error("File %s does not have the desired size. Clearing it.", fullfilename);
 514             memset(st, 0, size);
 515         }
 516         else if(st->update_every != update_every) {
 517             errno = 0;
 518             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 519             memset(st, 0, size);
 520         }
 521         else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 522             errno = 0;
 523             error("File %s is too old. Clearing it.", fullfilename);
 524             memset(st, 0, size);
 525         }
 526
 527         // make sure the database is aligned
 528         if(st->last_updated.tv_sec)
 529             timeval_align(&st->last_updated, update_every);
 530     }
 531
 532     if(st) {
 533         st->name = NULL;
 534         st->type = NULL;
 535         st->family = NULL;
 536         st->context = NULL;
 537         st->title = NULL;
 538         st->units = NULL;
 539         st->dimensions = NULL;
 540         st->next = NULL;
 541         st->mapped = rrd_memory_mode;
 542         st->variables = NULL;
 543         st->alarms = NULL;
 544         memset(&st->rwlock, 0, sizeof(pthread_rwlock_t));
 545         memset(&st->avl, 0, sizeof(avl));
 546         memset(&st->avlname, 0, sizeof(avl));
 547         memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 548         memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 549     }
 550     else {
 551         st = callocz(1, size);
 552         st->mapped = RRD_MEMORY_MODE_RAM;
 553     }
 554
 555     st->memsize = size;
 556     st->entries = entries;
 557     st->update_every = update_every;
 558
 559     if(st->current_entry >= st->entries) st->current_entry = 0;
 560
 561     strcpy(st->cache_filename, fullfilename);
 562     strcpy(st->magic, RRDSET_MAGIC);
 563
 564     strcpy(st->id, fullid);
 565     st->hash = simple_hash(st->id);
 566
 567     st->cache_dir = cache_dir;
 568
 569     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 570     st->type       = config_get(st->id, "type", type);
 571     st->family     = config_get(st->id, "family", family?family:st->type);
 572     st->units      = config_get(st->id, "units", units?units:"");
 573
 574     st->context    = config_get(st->id, "context", context?context:st->id);
 575     st->hash_context = simple_hash(st->context);
 576
 577     st->priority = config_get_number(st->id, "priority", priority);
 578     st->enabled = enabled;
 579
 580     st->isdetail = 0;
 581     st->debug = 0;
 582
 583     // if(!strcmp(st->id, "disk_util.dm-0")) {
 584     //     st->debug = 1;
 585     //     error("enabled debugging for '%s'", st->id);
 586     // }
 587     // else error("not enabled debugging for '%s'", st->id);
 588
 589     st->green = NAN;
 590     st->red = NAN;
 591
 592     st->last_collected_time.tv_sec = 0;
 593     st->last_collected_time.tv_usec = 0;
 594     st->counter_done = 0;
 595
 596     st->gap_when_lost_iterations_above = (int) (
 597             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 598
 599     avl_init_lock(&st->dimensions_index, rrddim_compare);
 600     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 601
 602     pthread_rwlock_init(&st->rwlock, NULL);
 603     rrdhost_rwlock(&localhost);
 604
 605     if(name && *name) rrdset_set_name(st, name);
 606     else rrdset_set_name(st, id);
 607
 608     {
 609         char varvalue[CONFIG_MAX_VALUE + 1];
 610         char varvalue2[CONFIG_MAX_VALUE + 1];
 611         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 612         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 613         st->title = config_get(st->id, "title", varvalue2);
 614     }
 615
 616     st->rrdfamily = rrdfamily_create(st->family);
 617     st->rrdhost = &localhost;
 618
 619     st->next = localhost.rrdset_root;
 620     localhost.rrdset_root = st;
 621
 622     if(health_enabled) {
 623         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 624         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 625         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 626         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 627         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 628     }
 629
 630     if(unlikely(rrdset_index_add(&localhost, st) != st))
 631         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 632
 633     rrdsetcalc_link_matching(st);
 634     rrdcalctemplate_link_matching(st);
 635
 636     rrdhost_unlock(&localhost);
 637
 638     return(st);
 639 }
 640
 641 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 642 {
 643     RRDDIM *rd = rrddim_find(st, id);
 644     if(rd) {
 645         debug(D_RRD_CALLS, "Cannot create rrd dimension '%s/%s', it already exists.", st->id, name?name:"<NONAME>");
 646         return rd;
 647     }
 648
 649     char filename[FILENAME_MAX + 1];
 650     char fullfilename[FILENAME_MAX + 1];
 651
 652     char varname[CONFIG_MAX_NAME + 1];
 653     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 654
 655     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 656
 657     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 658     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 659
 660     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM)
 661         rd = (RRDDIM *)mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP)?MAP_SHARED:MAP_PRIVATE), 1);
 662
 663     if(rd) {
 664         struct timeval now;
 665         now_realtime_timeval(&now);
 666
 667         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 668             errno = 0;
 669             info("Initializing file %s.", fullfilename);
 670             memset(rd, 0, size);
 671         }
 672         else if(rd->memsize != size) {
 673             errno = 0;
 674             error("File %s does not have the desired size. Clearing it.", fullfilename);
 675             memset(rd, 0, size);
 676         }
 677         else if(rd->multiplier != multiplier) {
 678             errno = 0;
 679             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 680             memset(rd, 0, size);
 681         }
 682         else if(rd->divisor != divisor) {
 683             errno = 0;
 684             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 685             memset(rd, 0, size);
 686         }
 687         else if(rd->update_every != st->update_every) {
 688             errno = 0;
 689             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 690             memset(rd, 0, size);
 691         }
 692         else if(dt_usec(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * USEC_PER_SEC)) {
 693             errno = 0;
 694             error("File %s is too old. Clearing it.", fullfilename);
 695             memset(rd, 0, size);
 696         }
 697         else if(strcmp(rd->id, id) != 0) {
 698             errno = 0;
 699             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 700             // munmap(rd, size);
 701             // rd = NULL;
 702             memset(rd, 0, size);
 703         }
 704
 705         if(rd->algorithm && rd->algorithm != algorithm)
 706             error("File %s does not have the expected algorithm (expected %d '%s', found %d '%s'). Previous values may be wrong.", fullfilename, algorithm, rrddim_algorithm_name(algorithm), rd->algorithm, rrddim_algorithm_name(rd->algorithm));
 707     }
 708
 709     if(rd) {
 710         // we have a file mapped for rd
 711         rd->mapped = rrd_memory_mode;
 712         rd->flags = 0x00000000;
 713         rd->variables = NULL;
 714         rd->next = NULL;
 715         rd->name = NULL;
 716         memset(&rd->avl, 0, sizeof(avl));
 717     }
 718     else {
 719         // if we didn't manage to get a mmap'd dimension, just create one
 720
 721         rd = callocz(1, size);
 722         rd->mapped = RRD_MEMORY_MODE_RAM;
 723     }
 724     rd->memsize = size;
 725
 726     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 727     strcpy(rd->cache_filename, fullfilename);
 728     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 729     rd->hash = simple_hash(rd->id);
 730
 731     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 732     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 733
 734     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 735     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 736
 737     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 738     rd->multiplier = config_get_number(st->id, varname, multiplier);
 739
 740     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 741     rd->divisor = config_get_number(st->id, varname, divisor);
 742     if(!rd->divisor) rd->divisor = 1;
 743
 744     rd->entries = st->entries;
 745     rd->update_every = st->update_every;
 746
 747     // prevent incremental calculation spikes
 748     rd->counter = 0;
 749     rd->updated = 0;
 750     rd->calculated_value = 0;
 751     rd->last_calculated_value = 0;
 752     rd->collected_value = 0;
 753     rd->last_collected_value = 0;
 754     rd->collected_volume = 0;
 755     rd->stored_volume = 0;
 756     rd->last_stored_value = 0;
 757     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 758     rd->last_collected_time.tv_sec = 0;
 759     rd->last_collected_time.tv_usec = 0;
 760     rd->rrdset = st;
 761
 762     // append this dimension
 763     pthread_rwlock_wrlock(&st->rwlock);
 764     if(!st->dimensions)
 765         st->dimensions = rd;
 766     else {
 767         RRDDIM *td = st->dimensions;
 768         for(; td->next; td = td->next) ;
 769         td->next = rd;
 770     }
 771
 772     if(health_enabled) {
 773         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 774         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 775         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 776     }
 777
 778     pthread_rwlock_unlock(&st->rwlock);
 779
 780     if(unlikely(rrddim_index_add(st, rd) != rd))
 781         error("RRDDIM: INTERNAL ERROR: attempt to index duplicate dimension '%s' on chart '%s'", rd->id, st->id);
 782
 783     return(rd);
 784 }
 785
 786 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 787 {
 788     if(unlikely(rd->name && !strcmp(rd->name, name)))
 789         return;
 790
 791     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 792
 793     char varname[CONFIG_MAX_NAME + 1];
 794     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 795     rd->name = config_set_default(st->id, varname, name);
 796
 797     rrddimvar_rename_all(rd);
 798 }
 799
 800 void rrddim_free(RRDSET *st, RRDDIM *rd)
 801 {
 802     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 803
 804     if(rd == st->dimensions)
 805         st->dimensions = rd->next;
 806     else {
 807         RRDDIM *i;
 808         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 809
 810         if (i && i->next == rd)
 811             i->next = rd->next;
 812         else
 813             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 814     }
 815     rd->next = NULL;
 816
 817     while(rd->variables)
 818         rrddimvar_free(rd->variables);
 819
 820     if(unlikely(rrddim_index_del(st, rd) != rd))
 821         error("RRDDIM: INTERNAL ERROR: attempt to remove from index dimension '%s' on chart '%s', removed a different dimension.", rd->id, st->id);
 822
 823     // free(rd->annotations);
 824     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 825         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 826         savememory(rd->cache_filename, rd, rd->memsize);
 827
 828         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 829         munmap(rd, rd->memsize);
 830     }
 831     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 832         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 833         munmap(rd, rd->memsize);
 834     }
 835     else {
 836         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 837         freez(rd);
 838     }
 839 }
 840
 841 void rrdset_free_all(void)
 842 {
 843     info("Freeing all memory...");
 844
 845     rrdhost_rwlock(&localhost);
 846
 847     RRDSET *st;
 848     for(st = localhost.rrdset_root; st ;) {
 849         RRDSET *next = st->next;
 850
 851         pthread_rwlock_wrlock(&st->rwlock);
 852
 853         while(st->variables)
 854             rrdsetvar_free(st->variables);
 855
 856         while(st->alarms)
 857             rrdsetcalc_unlink(st->alarms);
 858
 859         while(st->dimensions)
 860             rrddim_free(st, st->dimensions);
 861
 862         if(unlikely(rrdset_index_del(&localhost, st) != st))
 863             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 864
 865         rrdset_index_del_name(&localhost, st);
 866
 867         st->rrdfamily->use_count--;
 868         if(!st->rrdfamily->use_count)
 869             rrdfamily_free(st->rrdfamily);
 870
 871         pthread_rwlock_unlock(&st->rwlock);
 872
 873         if(st->mapped == RRD_MEMORY_MODE_SAVE || st->mapped == RRD_MEMORY_MODE_MAP) {
 874             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 875             munmap(st, st->memsize);
 876         }
 877         else
 878             freez(st);
 879
 880         st = next;
 881     }
 882     localhost.rrdset_root = NULL;
 883
 884     rrdhost_unlock(&localhost);
 885
 886     info("Memory cleanup completed...");
 887 }
 888
 889 void rrdset_save_all(void) {
 890     info("Saving database...");
 891
 892     RRDSET *st;
 893     RRDDIM *rd;
 894
 895     // we get an write lock
 896     // to ensure only one thread is saving the database
 897     rrdhost_rwlock(&localhost);
 898
 899     for(st = localhost.rrdset_root; st ; st = st->next) {
 900         pthread_rwlock_rdlock(&st->rwlock);
 901
 902         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 903             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 904             savememory(st->cache_filename, st, st->memsize);
 905         }
 906
 907         for(rd = st->dimensions; rd ; rd = rd->next) {
 908             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 909                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 910                 savememory(rd->cache_filename, rd, rd->memsize);
 911             }
 912         }
 913
 914         pthread_rwlock_unlock(&st->rwlock);
 915     }
 916
 917     rrdhost_unlock(&localhost);
 918 }
 919
 920
 921 RRDSET *rrdset_find(const char *id)
 922 {
 923     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 924
 925     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 926     return(st);
 927 }
 928
 929 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 930 {
 931     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 932
 933     char buf[RRD_ID_LENGTH_MAX + 1];
 934
 935     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 936     strcat(buf, ".");
 937     int len = (int) strlen(buf);
 938     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 939
 940     return(rrdset_find(buf));
 941 }
 942
 943 RRDSET *rrdset_find_byname(const char *name)
 944 {
 945     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 946
 947     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 948     return(st);
 949 }
 950
 951 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 952 {
 953     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 954
 955     return rrddim_index_find(st, id, 0);
 956 }
 957
 958 int rrddim_hide(RRDSET *st, const char *id)
 959 {
 960     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 961
 962     RRDDIM *rd = rrddim_find(st, id);
 963     if(unlikely(!rd)) {
 964         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 965         return 1;
 966     }
 967
 968     rd->flags |= RRDDIM_FLAG_HIDDEN;
 969     return 0;
 970 }
 971
 972 int rrddim_unhide(RRDSET *st, const char *id)
 973 {
 974     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 975
 976     RRDDIM *rd = rrddim_find(st, id);
 977     if(unlikely(!rd)) {
 978         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 979         return 1;
 980     }
 981
 982     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 983     return 0;
 984 }
 985
 986 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 987 {
 988     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 989
 990     now_realtime_timeval(&rd->last_collected_time);
 991     rd->collected_value = value;
 992     rd->updated = 1;
 993     rd->counter++;
 994
 995     // fprintf(stderr, "%s.%s %llu " COLLECTED_NUMBER_FORMAT " dt %0.6f" " rate " CALCULATED_NUMBER_FORMAT "\n", st->name, rd->name, st->usec_since_last_update, value, (float)((double)st->usec_since_last_update / (double)1000000), (calculated_number)((value - rd->last_collected_value) * (calculated_number)rd->multiplier / (calculated_number)rd->divisor * 1000000.0 / (calculated_number)st->usec_since_last_update));
 996
 997     return rd->last_collected_value;
 998 }
 999
1000 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
1001 {
1002     RRDDIM *rd = rrddim_find(st, id);
1003     if(unlikely(!rd)) {
1004         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
1005         return 0;
1006     }
1007
1008     return rrddim_set_by_pointer(st, rd, value);
1009 }
1010
1011 void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds)
1012 {
1013     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
1014         // the first entry
1015         microseconds = st->update_every * USEC_PER_SEC;
1016     }
1017     st->usec_since_last_update = microseconds;
1018 }
1019
1020 void rrdset_next_usec(RRDSET *st, usec_t microseconds)
1021 {
1022     struct timeval now;
1023     now_realtime_timeval(&now);
1024
1025     if(unlikely(!st->last_collected_time.tv_sec)) {
1026         // the first entry
1027         microseconds = st->update_every * USEC_PER_SEC;
1028     }
1029     else if(unlikely(!microseconds)) {
1030         // no dt given by the plugin
1031         microseconds = dt_usec(&now, &st->last_collected_time);
1032     }
1033     else {
1034         // microseconds has the time since the last collection
1035 #ifdef NETDATA_INTERNAL_CHECKS
1036         usec_t now_usec = timeval_usec(&now);
1037         usec_t last_usec = timeval_usec(&st->last_collected_time);
1038 #endif
1039         usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
1040
1041         // verify the microseconds given is good
1042         if(unlikely(microseconds > since_last_usec)) {
1043             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);
1044
1045 #ifdef NETDATA_INTERNAL_CHECKS
1046             if(unlikely(last_usec + microseconds > now_usec + 1000))
1047                 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);
1048 #endif
1049
1050             microseconds = since_last_usec;
1051         }
1052         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1053             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);
1054
1055 #ifdef NETDATA_INTERNAL_CHECKS
1056             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);
1057 #endif
1058             microseconds = since_last_usec;
1059         }
1060     }
1061     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1062
1063     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1064     st->usec_since_last_update = microseconds;
1065 }
1066
1067 usec_t rrdset_done(RRDSET *st)
1068 {
1069     if(unlikely(netdata_exit)) return 0;
1070
1071     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1072
1073     RRDDIM *rd;
1074
1075     int
1076         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1077
1078     char
1079         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1080         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1081
1082     unsigned int
1083         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1084
1085     usec_t
1086         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1087         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1088         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1089         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1090         update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
1091
1092     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1093         error("Cannot set pthread cancel state to DISABLE.");
1094
1095     // a read lock is OK here
1096     pthread_rwlock_rdlock(&st->rwlock);
1097
1098 /*
1099     // enable the chart, if it was disabled
1100     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1101         st->enabled = 1;
1102 */
1103
1104     // check if the chart has a long time to be updated
1105     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1106         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1107         rrdset_reset(st);
1108         st->usec_since_last_update = update_every_ut;
1109         first_entry = 1;
1110     }
1111     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1112
1113     // set last_collected_time
1114     if(unlikely(!st->last_collected_time.tv_sec)) {
1115         // it is the first entry
1116         // set the last_collected_time to now
1117         now_realtime_timeval(&st->last_collected_time);
1118         timeval_align(&st->last_collected_time, st->update_every);
1119
1120         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
1121
1122         // the first entry should not be stored
1123         store_this_entry = 0;
1124         first_entry = 1;
1125
1126         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
1127     }
1128     else {
1129         // it is not the first entry
1130         // calculate the proper last_collected_time, using usec_since_last_update
1131         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1132         usec_t ut = last_collect_ut + st->usec_since_last_update;
1133         st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
1134         st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1135     }
1136
1137     // if this set has not been updated in the past
1138     // we fake the last_update time to be = now - usec_since_last_update
1139     if(unlikely(!st->last_updated.tv_sec)) {
1140         // it has never been updated before
1141         // set a fake last_updated, in the past using usec_since_last_update
1142         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1143         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1144         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1145
1146         // the first entry should not be stored
1147         store_this_entry = 0;
1148         first_entry = 1;
1149
1150         if(unlikely(st->debug)) 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);
1151     }
1152
1153     // check if we will re-write the entire data set
1154     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1155         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);
1156         rrdset_reset(st);
1157
1158         st->usec_since_last_update = update_every_ut;
1159
1160         now_realtime_timeval(&st->last_collected_time);
1161         timeval_align(&st->last_collected_time, st->update_every);
1162
1163         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1164         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1165         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1166
1167         // the first entry should not be stored
1168         store_this_entry = 0;
1169         first_entry = 1;
1170     }
1171
1172     // these are the 3 variables that will help us in interpolation
1173     // last_stored_ut = the last time we added a value to the storage
1174     // now_collect_ut = the time the current value has been collected
1175     // next_store_ut  = the time of the next interpolation point
1176     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
1177     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1178     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
1179
1180     if(unlikely(st->debug)) {
1181         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1182         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1183         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1184         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1185     }
1186
1187     if(unlikely(!st->counter_done)) {
1188         store_this_entry = 0;
1189         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1190     }
1191     st->counter_done++;
1192
1193     // calculate totals and count the dimensions
1194     int dimensions;
1195     st->collected_total = 0;
1196     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1197         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1198
1199     uint32_t storage_flags = SN_EXISTS;
1200
1201     // process all dimensions to calculate their values
1202     // based on the collected figures only
1203     // at this stage we do not interpolate anything
1204     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1205
1206         if(unlikely(!rd->updated)) {
1207             rd->calculated_value = 0;
1208             continue;
1209         }
1210
1211         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1212             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1213             " collected_value = " COLLECTED_NUMBER_FORMAT
1214             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1215             " calculated_value = " CALCULATED_NUMBER_FORMAT
1216             , st->id, rd->name
1217             , rd->last_collected_value
1218             , rd->collected_value
1219             , rd->last_calculated_value
1220             , rd->calculated_value
1221             );
1222
1223         switch(rd->algorithm) {
1224             case RRDDIM_ABSOLUTE:
1225                 rd->calculated_value = (calculated_number)rd->collected_value
1226                     * (calculated_number)rd->multiplier
1227                     / (calculated_number)rd->divisor;
1228
1229                 if(unlikely(st->debug))
1230                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1231                         CALCULATED_NUMBER_FORMAT " = "
1232                         COLLECTED_NUMBER_FORMAT
1233                         " * " CALCULATED_NUMBER_FORMAT
1234                         " / " CALCULATED_NUMBER_FORMAT
1235                         , st->id, rd->name
1236                         , rd->calculated_value
1237                         , rd->collected_value
1238                         , (calculated_number)rd->multiplier
1239                         , (calculated_number)rd->divisor
1240                         );
1241                 break;
1242
1243             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1244                 if(unlikely(!st->collected_total))
1245                     rd->calculated_value = 0;
1246                 else
1247                     // the percentage of the current value
1248                     // over the total of all dimensions
1249                     rd->calculated_value =
1250                           (calculated_number)100
1251                         * (calculated_number)rd->collected_value
1252                         / (calculated_number)st->collected_total;
1253
1254                 if(unlikely(st->debug))
1255                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1256                         CALCULATED_NUMBER_FORMAT " = 100"
1257                         " * " COLLECTED_NUMBER_FORMAT
1258                         " / " COLLECTED_NUMBER_FORMAT
1259                         , st->id, rd->name
1260                         , rd->calculated_value
1261                         , rd->collected_value
1262                         , st->collected_total
1263                         );
1264                 break;
1265
1266             case RRDDIM_INCREMENTAL:
1267                 if(unlikely(rd->counter <= 1)) {
1268                     rd->calculated_value = 0;
1269                     continue;
1270                 }
1271
1272                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1273                 // to reset the calculation (it will give zero as the calculation for this second)
1274                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1275                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1276                             , st->name, rd->name
1277                             , rd->last_collected_value
1278                             , rd->collected_value);
1279                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1280                     rd->last_collected_value = rd->collected_value;
1281                 }
1282
1283                 rd->calculated_value +=
1284                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1285                     * (calculated_number)rd->multiplier
1286                     / (calculated_number)rd->divisor;
1287
1288                 if(unlikely(st->debug))
1289                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1290                         CALCULATED_NUMBER_FORMAT " = ("
1291                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1292                         ")"
1293                         " * " CALCULATED_NUMBER_FORMAT
1294                         " / " CALCULATED_NUMBER_FORMAT
1295                         , st->id, rd->name
1296                         , rd->calculated_value
1297                         , rd->collected_value, rd->last_collected_value
1298                         , (calculated_number)rd->multiplier
1299                         , (calculated_number)rd->divisor
1300                         );
1301                 break;
1302
1303             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1304                 if(unlikely(rd->counter <= 1)) {
1305                     rd->calculated_value = 0;
1306                     continue;
1307                 }
1308
1309                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1310                 // to reset the calculation (it will give zero as the calculation for this second)
1311                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1312                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1313                     , st->name, rd->name
1314                     , rd->last_collected_value
1315                     , rd->collected_value);
1316                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1317                     rd->last_collected_value = rd->collected_value;
1318                 }
1319
1320                 // the percentage of the current increment
1321                 // over the increment of all dimensions together
1322                 if(unlikely(st->collected_total == st->last_collected_total))
1323                     rd->calculated_value = 0;
1324                 else
1325                     rd->calculated_value =
1326                           (calculated_number)100
1327                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1328                         / (calculated_number)(st->collected_total - st->last_collected_total);
1329
1330                 if(unlikely(st->debug))
1331                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1332                         CALCULATED_NUMBER_FORMAT " = 100"
1333                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1334                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1335                         , st->id, rd->name
1336                         , rd->calculated_value
1337                         , rd->collected_value, rd->last_collected_value
1338                         , st->collected_total, st->last_collected_total
1339                         );
1340                 break;
1341
1342             default:
1343                 // make the default zero, to make sure
1344                 // it gets noticed when we add new types
1345                 rd->calculated_value = 0;
1346
1347                 if(unlikely(st->debug))
1348                     debug(D_RRD_STATS, "%s/%s: CALC "
1349                         CALCULATED_NUMBER_FORMAT " = 0"
1350                         , st->id, rd->name
1351                         , rd->calculated_value
1352                         );
1353                 break;
1354         }
1355
1356         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1357             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1358             " collected_value = " COLLECTED_NUMBER_FORMAT
1359             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1360             " calculated_value = " CALCULATED_NUMBER_FORMAT
1361             , st->id, rd->name
1362             , rd->last_collected_value
1363             , rd->collected_value
1364             , rd->last_calculated_value
1365             , rd->calculated_value
1366             );
1367
1368     }
1369
1370     // at this point we have all the calculated values ready
1371     // it is now time to interpolate values on a second boundary
1372
1373     if(unlikely(now_collect_ut < next_store_ut)) {
1374         // this is collected in the same interpolation point
1375         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1376 #ifdef NETDATA_INTERNAL_CHECKS
1377         info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1378 #endif
1379     }
1380
1381     usec_t first_ut = last_stored_ut;
1382     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1383     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1384
1385     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1386 #ifdef NETDATA_INTERNAL_CHECKS
1387         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); }
1388 #endif
1389
1390         if(unlikely(st->debug)) {
1391             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1392             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1393         }
1394
1395         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
1396         st->last_updated.tv_usec = 0;
1397
1398         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1399             calculated_number new_value;
1400
1401             switch(rd->algorithm) {
1402                 case RRDDIM_INCREMENTAL:
1403                     new_value = (calculated_number)
1404                         (      rd->calculated_value
1405                             * (calculated_number)(next_store_ut - last_collect_ut)
1406                             / (calculated_number)(now_collect_ut - last_collect_ut)
1407                         );
1408
1409                     if(unlikely(st->debug))
1410                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1411                             CALCULATED_NUMBER_FORMAT " = "
1412                             CALCULATED_NUMBER_FORMAT
1413                             " * %llu"
1414                             " / %llu"
1415                             , st->id, rd->name
1416                             , new_value
1417                             , rd->calculated_value
1418                             , (next_store_ut - last_stored_ut)
1419                             , (now_collect_ut - last_stored_ut)
1420                             );
1421
1422                     rd->calculated_value -= new_value;
1423                     new_value += rd->last_calculated_value;
1424                     rd->last_calculated_value = 0;
1425                     new_value /= (calculated_number)st->update_every;
1426
1427                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1428                         if(unlikely(st->debug))
1429                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1430                                 st->id, rd->name
1431                                 , (calculated_number)(next_store_ut - last_stored_ut)
1432                                 );
1433                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1434                     }
1435                     break;
1436
1437                 case RRDDIM_ABSOLUTE:
1438                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1439                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1440                 default:
1441                     if(iterations == 1) {
1442                         // this is the last iteration
1443                         // do not interpolate
1444                         // just show the calculated value
1445
1446                         new_value = rd->calculated_value;
1447                     }
1448                     else {
1449                         // we have missed an update
1450                         // interpolate in the middle values
1451
1452                         new_value = (calculated_number)
1453                             (   (     (rd->calculated_value - rd->last_calculated_value)
1454                                     * (calculated_number)(next_store_ut - last_collect_ut)
1455                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1456                                 )
1457                                 +  rd->last_calculated_value
1458                             );
1459
1460                         if(unlikely(st->debug))
1461                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1462                                 CALCULATED_NUMBER_FORMAT " = ((("
1463                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1464                                 " * %llu"
1465                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1466                                 , st->id, rd->name
1467                                 , new_value
1468                                 , rd->calculated_value, rd->last_calculated_value
1469                                 , (next_store_ut - first_ut)
1470                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1471                                 );
1472                     }
1473                     break;
1474             }
1475
1476             if(unlikely(!store_this_entry)) {
1477                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1478                 continue;
1479             }
1480
1481             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1482                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1483                 rd->last_stored_value = new_value;
1484
1485                 if(unlikely(st->debug))
1486                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1487                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1488                         , st->id, rd->name
1489                         , st->current_entry
1490                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1491                         );
1492             }
1493             else {
1494                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1495                         , st->id, rd->name
1496                         , st->current_entry
1497                         );
1498                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1499                 rd->last_stored_value = NAN;
1500             }
1501
1502             stored_entries++;
1503
1504             if(unlikely(st->debug)) {
1505                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1506                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1507                 calculated_number accuracy = accuracy_loss(t1, t2);
1508                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1509                         , st->id, rd->name
1510                         , st->current_entry
1511                         , t2
1512                         , get_storage_number_flags(rd->values[st->current_entry])
1513                         , t1
1514                         , accuracy
1515                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1516                         );
1517
1518                 rd->collected_volume += t1;
1519                 rd->stored_volume += t2;
1520                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1521                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1522                         , st->id, rd->name
1523                         , st->current_entry
1524                         , rd->stored_volume
1525                         , rd->collected_volume
1526                         , accuracy
1527                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1528                         );
1529
1530             }
1531         }
1532         // reset the storage flags for the next point, if any;
1533         storage_flags = SN_EXISTS;
1534
1535         st->counter++;
1536         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1537         last_stored_ut = next_store_ut;
1538     }
1539
1540     st->last_collected_total  = st->collected_total;
1541
1542     for( rd = st->dimensions; rd ; rd = rd->next ) {
1543         if(unlikely(!rd->updated)) continue;
1544
1545         if(unlikely(st->debug)) 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);
1546         rd->last_collected_value = rd->collected_value;
1547
1548         switch(rd->algorithm) {
1549             case RRDDIM_INCREMENTAL:
1550                 if(unlikely(!first_entry)) {
1551                     if(unlikely(st->debug)) 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);
1552                     rd->last_calculated_value += rd->calculated_value;
1553                 }
1554                 else {
1555                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1556                 }
1557                 break;
1558
1559             case RRDDIM_ABSOLUTE:
1560             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1561             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1562                 if(unlikely(st->debug)) 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);
1563                 rd->last_calculated_value = rd->calculated_value;
1564                 break;
1565         }
1566
1567         rd->calculated_value = 0;
1568         rd->collected_value = 0;
1569         rd->updated = 0;
1570
1571         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1572             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1573             " collected_value = " COLLECTED_NUMBER_FORMAT
1574             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1575             " calculated_value = " CALCULATED_NUMBER_FORMAT
1576             , st->id, rd->name
1577             , rd->last_collected_value
1578             , rd->collected_value
1579             , rd->last_calculated_value
1580             , rd->calculated_value
1581             );
1582     }
1583
1584     // ALL DONE ABOUT THE DATA UPDATE
1585     // --------------------------------------------------------------------
1586
1587 /*
1588     // find if there are any obsolete dimensions (not updated recently)
1589     if(unlikely(rrd_delete_unupdated_dimensions)) {
1590
1591         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1592             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1593                 break;
1594
1595         if(unlikely(rd)) {
1596             RRDDIM *last;
1597             // there is dimension to free
1598             // upgrade our read lock to a write lock
1599             pthread_rwlock_unlock(&st->rwlock);
1600             pthread_rwlock_wrlock(&st->rwlock);
1601
1602             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1603                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1604
1605                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1606                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1607
1608                     if(unlikely(!last)) {
1609                         st->dimensions = rd->next;
1610                         rd->next = NULL;
1611                         rrddim_free(st, rd);
1612                         rd = st->dimensions;
1613                         continue;
1614                     }
1615                     else {
1616                         last->next = rd->next;
1617                         rd->next = NULL;
1618                         rrddim_free(st, rd);
1619                         rd = last->next;
1620                         continue;
1621                     }
1622                 }
1623
1624                 last = rd;
1625                 rd = rd->next;
1626             }
1627
1628             if(unlikely(!st->dimensions)) {
1629                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1630                 st->enabled = 0;
1631             }
1632         }
1633     }
1634 */
1635
1636     pthread_rwlock_unlock(&st->rwlock);
1637
1638     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1639         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1640
1641     return(st->usec_since_last_update);
1642 }