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     static char *cache_dir = NULL;
 396     if(!cache_dir) {
 397         cache_dir = config_get("global", "cache directory", CACHE_DIR);
 398         int r = mkdir(cache_dir, 0755);
 399         if(r != 0 && errno != EEXIST)
 400             error("Cannot create directory '%s'", cache_dir);
 401     }
 402
 403     char b[FILENAME_MAX + 1];
 404     char n[FILENAME_MAX + 1];
 405     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 406
 407     snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 408     ret = config_get(id, "cache directory", n);
 409
 410     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 411         int r = mkdir(ret, 0775);
 412         if(r != 0 && errno != EEXIST)
 413             error("Cannot create directory '%s'", ret);
 414     }
 415
 416     return ret;
 417 }
 418
 419 // ----------------------------------------------------------------------------
 420 // core functions
 421
 422 void rrdset_reset(RRDSET *st)
 423 {
 424     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 425
 426     st->last_collected_time.tv_sec = 0;
 427     st->last_collected_time.tv_usec = 0;
 428     st->last_updated.tv_sec = 0;
 429     st->last_updated.tv_usec = 0;
 430     st->current_entry = 0;
 431     st->counter = 0;
 432     st->counter_done = 0;
 433
 434     RRDDIM *rd;
 435     for(rd = st->dimensions; rd ; rd = rd->next) {
 436         rd->last_collected_time.tv_sec = 0;
 437         rd->last_collected_time.tv_usec = 0;
 438         rd->counter = 0;
 439         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 440     }
 441 }
 442 static inline long align_entries_to_pagesize(long entries) {
 443     if(entries < 5) entries = 5;
 444     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 445
 446 #ifdef NETDATA_LOG_ALLOCATIONS
 447     long page = (size_t)sysconf(_SC_PAGESIZE);
 448
 449     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 450     if(size % page) {
 451         size -= (size % page);
 452         size += page;
 453
 454         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 455         return n;
 456     }
 457
 458     return entries;
 459 #else
 460     return entries;
 461 #endif
 462 }
 463
 464 static inline void timeval_align(struct timeval *tv, int update_every) {
 465     tv->tv_sec -= tv->tv_sec % update_every;
 466     tv->tv_usec = 500000;
 467 }
 468
 469 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)
 470 {
 471     if(!type || !type[0]) {
 472         fatal("Cannot create rrd stats without a type.");
 473         return NULL;
 474     }
 475
 476     if(!id || !id[0]) {
 477         fatal("Cannot create rrd stats without an id.");
 478         return NULL;
 479     }
 480
 481     char fullid[RRD_ID_LENGTH_MAX + 1];
 482     char fullfilename[FILENAME_MAX + 1];
 483
 484     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 485
 486     RRDSET *st = rrdset_find(fullid);
 487     if(st) {
 488         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 489         return st;
 490     }
 491
 492     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 493     long entries = align_entries_to_pagesize(rentries);
 494     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 495
 496     int enabled = config_get_boolean(fullid, "enabled", 1);
 497     if(!enabled) entries = 5;
 498
 499     unsigned long size = sizeof(RRDSET);
 500     char *cache_dir = rrdset_cache_dir(fullid);
 501
 502     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 503
 504     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 505     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);
 506     if(st) {
 507         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 508             errno = 0;
 509             info("Initializing file %s.", fullfilename);
 510             memset(st, 0, size);
 511         }
 512         else if(strcmp(st->id, fullid) != 0) {
 513             errno = 0;
 514             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 515             // munmap(st, size);
 516             // st = NULL;
 517             memset(st, 0, size);
 518         }
 519         else if(st->memsize != size || st->entries != entries) {
 520             errno = 0;
 521             error("File %s does not have the desired size. Clearing it.", fullfilename);
 522             memset(st, 0, size);
 523         }
 524         else if(st->update_every != update_every) {
 525             errno = 0;
 526             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 527             memset(st, 0, size);
 528         }
 529         else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 530             errno = 0;
 531             error("File %s is too old. Clearing it.", fullfilename);
 532             memset(st, 0, size);
 533         }
 534
 535         // make sure the database is aligned
 536         if(st->last_updated.tv_sec)
 537             timeval_align(&st->last_updated, update_every);
 538     }
 539
 540     if(st) {
 541         st->name = NULL;
 542         st->type = NULL;
 543         st->family = NULL;
 544         st->context = NULL;
 545         st->title = NULL;
 546         st->units = NULL;
 547         st->dimensions = NULL;
 548         st->next = NULL;
 549         st->mapped = rrd_memory_mode;
 550         st->variables = NULL;
 551         st->alarms = NULL;
 552         memset(&st->rwlock, 0, sizeof(pthread_rwlock_t));
 553         memset(&st->avl, 0, sizeof(avl));
 554         memset(&st->avlname, 0, sizeof(avl));
 555         memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 556         memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 557     }
 558     else {
 559         st = callocz(1, size);
 560         st->mapped = RRD_MEMORY_MODE_RAM;
 561     }
 562
 563     st->memsize = size;
 564     st->entries = entries;
 565     st->update_every = update_every;
 566
 567     if(st->current_entry >= st->entries) st->current_entry = 0;
 568
 569     strcpy(st->cache_filename, fullfilename);
 570     strcpy(st->magic, RRDSET_MAGIC);
 571
 572     strcpy(st->id, fullid);
 573     st->hash = simple_hash(st->id);
 574
 575     st->cache_dir = cache_dir;
 576
 577     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 578     st->type       = config_get(st->id, "type", type);
 579     st->family     = config_get(st->id, "family", family?family:st->type);
 580     st->units      = config_get(st->id, "units", units?units:"");
 581
 582     st->context    = config_get(st->id, "context", context?context:st->id);
 583     st->hash_context = simple_hash(st->context);
 584
 585     st->priority = config_get_number(st->id, "priority", priority);
 586     st->enabled = enabled;
 587
 588     st->isdetail = 0;
 589     st->debug = 0;
 590
 591     // if(!strcmp(st->id, "disk_util.dm-0")) {
 592     //     st->debug = 1;
 593     //     error("enabled debugging for '%s'", st->id);
 594     // }
 595     // else error("not enabled debugging for '%s'", st->id);
 596
 597     st->green = NAN;
 598     st->red = NAN;
 599
 600     st->last_collected_time.tv_sec = 0;
 601     st->last_collected_time.tv_usec = 0;
 602     st->counter_done = 0;
 603
 604     st->gap_when_lost_iterations_above = (int) (
 605             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 606
 607     avl_init_lock(&st->dimensions_index, rrddim_compare);
 608     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 609
 610     pthread_rwlock_init(&st->rwlock, NULL);
 611     rrdhost_rwlock(&localhost);
 612
 613     if(name && *name) rrdset_set_name(st, name);
 614     else rrdset_set_name(st, id);
 615
 616     {
 617         char varvalue[CONFIG_MAX_VALUE + 1];
 618         char varvalue2[CONFIG_MAX_VALUE + 1];
 619         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 620         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 621         st->title = config_get(st->id, "title", varvalue2);
 622     }
 623
 624     st->rrdfamily = rrdfamily_create(st->family);
 625     st->rrdhost = &localhost;
 626
 627     st->next = localhost.rrdset_root;
 628     localhost.rrdset_root = st;
 629
 630     if(health_enabled) {
 631         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 632         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 633         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 634         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 635         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 636     }
 637
 638     if(unlikely(rrdset_index_add(&localhost, st) != st))
 639         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 640
 641     rrdsetcalc_link_matching(st);
 642     rrdcalctemplate_link_matching(st);
 643
 644     rrdhost_unlock(&localhost);
 645
 646     return(st);
 647 }
 648
 649 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 650 {
 651     char filename[FILENAME_MAX + 1];
 652     char fullfilename[FILENAME_MAX + 1];
 653
 654     char varname[CONFIG_MAX_NAME + 1];
 655     RRDDIM *rd = NULL;
 656     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 657
 658     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 659
 660     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 661     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 662     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM) rd = (RRDDIM *)mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP)?MAP_SHARED:MAP_PRIVATE), 1);
 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->algorithm != algorithm) {
 688             errno = 0;
 689             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 690             memset(rd, 0, size);
 691         }
 692         else if(rd->update_every != st->update_every) {
 693             errno = 0;
 694             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 695             memset(rd, 0, size);
 696         }
 697         else if(dt_usec(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * USEC_PER_SEC)) {
 698             errno = 0;
 699             error("File %s is too old. Clearing it.", fullfilename);
 700             memset(rd, 0, size);
 701         }
 702         else if(strcmp(rd->id, id) != 0) {
 703             errno = 0;
 704             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 705             // munmap(rd, size);
 706             // rd = NULL;
 707             memset(rd, 0, size);
 708         }
 709     }
 710
 711     if(rd) {
 712         // we have a file mapped for rd
 713         rd->mapped = rrd_memory_mode;
 714         rd->flags = 0x00000000;
 715         rd->variables = NULL;
 716         rd->next = NULL;
 717         rd->name = NULL;
 718         memset(&rd->avl, 0, sizeof(avl));
 719     }
 720     else {
 721         // if we didn't manage to get a mmap'd dimension, just create one
 722
 723         rd = callocz(1, size);
 724         rd->mapped = RRD_MEMORY_MODE_RAM;
 725     }
 726     rd->memsize = size;
 727
 728     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 729     strcpy(rd->cache_filename, fullfilename);
 730     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 731     rd->hash = simple_hash(rd->id);
 732
 733     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 734     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 735
 736     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 737     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 738
 739     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 740     rd->multiplier = config_get_number(st->id, varname, multiplier);
 741
 742     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 743     rd->divisor = config_get_number(st->id, varname, divisor);
 744     if(!rd->divisor) rd->divisor = 1;
 745
 746     rd->entries = st->entries;
 747     rd->update_every = st->update_every;
 748
 749     // prevent incremental calculation spikes
 750     rd->counter = 0;
 751     rd->updated = 0;
 752     rd->calculated_value = 0;
 753     rd->last_calculated_value = 0;
 754     rd->collected_value = 0;
 755     rd->last_collected_value = 0;
 756     rd->collected_volume = 0;
 757     rd->stored_volume = 0;
 758     rd->last_stored_value = 0;
 759     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 760     rd->last_collected_time.tv_sec = 0;
 761     rd->last_collected_time.tv_usec = 0;
 762     rd->rrdset = st;
 763
 764     // append this dimension
 765     pthread_rwlock_wrlock(&st->rwlock);
 766     if(!st->dimensions)
 767         st->dimensions = rd;
 768     else {
 769         RRDDIM *td = st->dimensions;
 770         for(; td->next; td = td->next) ;
 771         td->next = rd;
 772     }
 773
 774     if(health_enabled) {
 775         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 776         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 777         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 778     }
 779
 780     pthread_rwlock_unlock(&st->rwlock);
 781
 782     if(unlikely(rrddim_index_add(st, rd) != rd))
 783         error("RRDDIM: INTERNAL ERROR: attempt to index duplicate dimension '%s' on chart '%s'", rd->id, st->id);
 784
 785     return(rd);
 786 }
 787
 788 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 789 {
 790     if(unlikely(rd->name && !strcmp(rd->name, name)))
 791         return;
 792
 793     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 794
 795     char varname[CONFIG_MAX_NAME + 1];
 796     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 797     rd->name = config_set_default(st->id, varname, name);
 798
 799     rrddimvar_rename_all(rd);
 800 }
 801
 802 void rrddim_free(RRDSET *st, RRDDIM *rd)
 803 {
 804     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 805
 806     if(rd == st->dimensions)
 807         st->dimensions = rd->next;
 808     else {
 809         RRDDIM *i;
 810         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 811
 812         if (i && i->next == rd)
 813             i->next = rd->next;
 814         else
 815             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 816     }
 817     rd->next = NULL;
 818
 819     while(rd->variables)
 820         rrddimvar_free(rd->variables);
 821
 822     if(unlikely(rrddim_index_del(st, rd) != rd))
 823         error("RRDDIM: INTERNAL ERROR: attempt to remove from index dimension '%s' on chart '%s', removed a different dimension.", rd->id, st->id);
 824
 825     // free(rd->annotations);
 826     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 827         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 828         savememory(rd->cache_filename, rd, rd->memsize);
 829
 830         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 831         munmap(rd, rd->memsize);
 832     }
 833     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 834         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 835         munmap(rd, rd->memsize);
 836     }
 837     else {
 838         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 839         freez(rd);
 840     }
 841 }
 842
 843 void rrdset_free_all(void)
 844 {
 845     info("Freeing all memory...");
 846
 847     rrdhost_rwlock(&localhost);
 848
 849     RRDSET *st;
 850     for(st = localhost.rrdset_root; st ;) {
 851         RRDSET *next = st->next;
 852
 853         pthread_rwlock_wrlock(&st->rwlock);
 854
 855         while(st->variables)
 856             rrdsetvar_free(st->variables);
 857
 858         while(st->alarms)
 859             rrdsetcalc_unlink(st->alarms);
 860
 861         while(st->dimensions)
 862             rrddim_free(st, st->dimensions);
 863
 864         if(unlikely(rrdset_index_del(&localhost, st) != st))
 865             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 866
 867         rrdset_index_del_name(&localhost, st);
 868
 869         st->rrdfamily->use_count--;
 870         if(!st->rrdfamily->use_count)
 871             rrdfamily_free(st->rrdfamily);
 872
 873         pthread_rwlock_unlock(&st->rwlock);
 874
 875         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 876             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 877             savememory(st->cache_filename, st, st->memsize);
 878
 879             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 880             munmap(st, st->memsize);
 881         }
 882         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 883             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 884             munmap(st, st->memsize);
 885         }
 886         else
 887             freez(st);
 888
 889         st = next;
 890     }
 891     localhost.rrdset_root = NULL;
 892
 893     rrdhost_unlock(&localhost);
 894
 895     info("Memory cleanup completed...");
 896 }
 897
 898 void rrdset_save_all(void) {
 899     info("Saving database...");
 900
 901     RRDSET *st;
 902     RRDDIM *rd;
 903
 904     rrdhost_rwlock(&localhost);
 905     for(st = localhost.rrdset_root; st ; st = st->next) {
 906         pthread_rwlock_wrlock(&st->rwlock);
 907
 908         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 909             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 910             savememory(st->cache_filename, st, st->memsize);
 911         }
 912
 913         for(rd = st->dimensions; rd ; rd = rd->next) {
 914             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 915                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 916                 savememory(rd->cache_filename, rd, rd->memsize);
 917             }
 918         }
 919
 920         pthread_rwlock_unlock(&st->rwlock);
 921     }
 922     rrdhost_unlock(&localhost);
 923 }
 924
 925
 926 RRDSET *rrdset_find(const char *id)
 927 {
 928     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 929
 930     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 931     return(st);
 932 }
 933
 934 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 935 {
 936     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 937
 938     char buf[RRD_ID_LENGTH_MAX + 1];
 939
 940     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 941     strcat(buf, ".");
 942     int len = (int) strlen(buf);
 943     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 944
 945     return(rrdset_find(buf));
 946 }
 947
 948 RRDSET *rrdset_find_byname(const char *name)
 949 {
 950     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 951
 952     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 953     return(st);
 954 }
 955
 956 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 957 {
 958     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 959
 960     return rrddim_index_find(st, id, 0);
 961 }
 962
 963 int rrddim_hide(RRDSET *st, const char *id)
 964 {
 965     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 966
 967     RRDDIM *rd = rrddim_find(st, id);
 968     if(unlikely(!rd)) {
 969         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 970         return 1;
 971     }
 972
 973     rd->flags |= RRDDIM_FLAG_HIDDEN;
 974     return 0;
 975 }
 976
 977 int rrddim_unhide(RRDSET *st, const char *id)
 978 {
 979     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 980
 981     RRDDIM *rd = rrddim_find(st, id);
 982     if(unlikely(!rd)) {
 983         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 984         return 1;
 985     }
 986
 987     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 988     return 0;
 989 }
 990
 991 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 992 {
 993     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 994
 995     now_realtime_timeval(&rd->last_collected_time);
 996     rd->collected_value = value;
 997     rd->updated = 1;
 998     rd->counter++;
 999
1000     // 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));
1001
1002     return rd->last_collected_value;
1003 }
1004
1005 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
1006 {
1007     RRDDIM *rd = rrddim_find(st, id);
1008     if(unlikely(!rd)) {
1009         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
1010         return 0;
1011     }
1012
1013     return rrddim_set_by_pointer(st, rd, value);
1014 }
1015
1016 void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds)
1017 {
1018     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
1019         // the first entry
1020         microseconds = st->update_every * USEC_PER_SEC;
1021     }
1022     st->usec_since_last_update = microseconds;
1023 }
1024
1025 void rrdset_next_usec(RRDSET *st, usec_t microseconds)
1026 {
1027     struct timeval now;
1028     now_realtime_timeval(&now);
1029
1030     if(unlikely(!st->last_collected_time.tv_sec)) {
1031         // the first entry
1032         microseconds = st->update_every * USEC_PER_SEC;
1033     }
1034     else if(unlikely(!microseconds)) {
1035         // no dt given by the plugin
1036         microseconds = dt_usec(&now, &st->last_collected_time);
1037     }
1038     else {
1039         // microseconds has the time since the last collection
1040         usec_t now_usec = timeval_usec(&now);
1041         usec_t last_usec = timeval_usec(&st->last_collected_time);
1042         usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
1043
1044         // verify the microseconds given is good
1045         if(unlikely(microseconds > since_last_usec)) {
1046             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);
1047
1048 #ifdef NETDATA_INTERNAL_CHECKS
1049             if(unlikely(last_usec + microseconds > now_usec + 1000))
1050                 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);
1051 #endif
1052
1053             microseconds = since_last_usec;
1054         }
1055         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1056             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);
1057
1058 #ifdef NETDATA_INTERNAL_CHECKS
1059             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);
1060 #endif
1061             microseconds = since_last_usec;
1062         }
1063     }
1064     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1065
1066     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1067     st->usec_since_last_update = microseconds;
1068 }
1069
1070 usec_t rrdset_done(RRDSET *st)
1071 {
1072     if(unlikely(netdata_exit)) return 0;
1073
1074     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1075
1076     RRDDIM *rd;
1077
1078     int
1079         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1080
1081     char
1082         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1083         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1084
1085     unsigned int
1086         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1087
1088     usec_t
1089         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1090         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1091         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1092         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1093         update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
1094
1095     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1096         error("Cannot set pthread cancel state to DISABLE.");
1097
1098     // a read lock is OK here
1099     pthread_rwlock_rdlock(&st->rwlock);
1100
1101 /*
1102     // enable the chart, if it was disabled
1103     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1104         st->enabled = 1;
1105 */
1106
1107     // check if the chart has a long time to be updated
1108     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1109         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1110         rrdset_reset(st);
1111         st->usec_since_last_update = update_every_ut;
1112         first_entry = 1;
1113     }
1114     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1115
1116     // set last_collected_time
1117     if(unlikely(!st->last_collected_time.tv_sec)) {
1118         // it is the first entry
1119         // set the last_collected_time to now
1120         now_realtime_timeval(&st->last_collected_time);
1121         timeval_align(&st->last_collected_time, st->update_every);
1122
1123         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
1124
1125         // the first entry should not be stored
1126         store_this_entry = 0;
1127         first_entry = 1;
1128
1129         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);
1130     }
1131     else {
1132         // it is not the first entry
1133         // calculate the proper last_collected_time, using usec_since_last_update
1134         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1135         usec_t ut = last_collect_ut + st->usec_since_last_update;
1136         st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
1137         st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1138     }
1139
1140     // if this set has not been updated in the past
1141     // we fake the last_update time to be = now - usec_since_last_update
1142     if(unlikely(!st->last_updated.tv_sec)) {
1143         // it has never been updated before
1144         // set a fake last_updated, in the past using usec_since_last_update
1145         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1146         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1147         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1148
1149         // the first entry should not be stored
1150         store_this_entry = 0;
1151         first_entry = 1;
1152
1153         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);
1154     }
1155
1156     // check if we will re-write the entire data set
1157     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1158         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);
1159         rrdset_reset(st);
1160
1161         st->usec_since_last_update = update_every_ut;
1162
1163         now_realtime_timeval(&st->last_collected_time);
1164         timeval_align(&st->last_collected_time, st->update_every);
1165
1166         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1167         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1168         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1169
1170         // the first entry should not be stored
1171         store_this_entry = 0;
1172         first_entry = 1;
1173     }
1174
1175     // these are the 3 variables that will help us in interpolation
1176     // last_stored_ut = the last time we added a value to the storage
1177     // now_collect_ut = the time the current value has been collected
1178     // next_store_ut  = the time of the next interpolation point
1179     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
1180     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1181     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
1182
1183     if(unlikely(st->debug)) {
1184         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1185         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1186         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1187         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1188     }
1189
1190     if(unlikely(!st->counter_done)) {
1191         store_this_entry = 0;
1192         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1193     }
1194     st->counter_done++;
1195
1196     // calculate totals and count the dimensions
1197     int dimensions;
1198     st->collected_total = 0;
1199     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1200         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1201
1202     uint32_t storage_flags = SN_EXISTS;
1203
1204     // process all dimensions to calculate their values
1205     // based on the collected figures only
1206     // at this stage we do not interpolate anything
1207     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1208
1209         if(unlikely(!rd->updated)) {
1210             rd->calculated_value = 0;
1211             continue;
1212         }
1213
1214         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1215             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1216             " collected_value = " COLLECTED_NUMBER_FORMAT
1217             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1218             " calculated_value = " CALCULATED_NUMBER_FORMAT
1219             , st->id, rd->name
1220             , rd->last_collected_value
1221             , rd->collected_value
1222             , rd->last_calculated_value
1223             , rd->calculated_value
1224             );
1225
1226         switch(rd->algorithm) {
1227             case RRDDIM_ABSOLUTE:
1228                 rd->calculated_value = (calculated_number)rd->collected_value
1229                     * (calculated_number)rd->multiplier
1230                     / (calculated_number)rd->divisor;
1231
1232                 if(unlikely(st->debug))
1233                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1234                         CALCULATED_NUMBER_FORMAT " = "
1235                         COLLECTED_NUMBER_FORMAT
1236                         " * " CALCULATED_NUMBER_FORMAT
1237                         " / " CALCULATED_NUMBER_FORMAT
1238                         , st->id, rd->name
1239                         , rd->calculated_value
1240                         , rd->collected_value
1241                         , (calculated_number)rd->multiplier
1242                         , (calculated_number)rd->divisor
1243                         );
1244                 break;
1245
1246             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1247                 if(unlikely(!st->collected_total))
1248                     rd->calculated_value = 0;
1249                 else
1250                     // the percentage of the current value
1251                     // over the total of all dimensions
1252                     rd->calculated_value =
1253                           (calculated_number)100
1254                         * (calculated_number)rd->collected_value
1255                         / (calculated_number)st->collected_total;
1256
1257                 if(unlikely(st->debug))
1258                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1259                         CALCULATED_NUMBER_FORMAT " = 100"
1260                         " * " COLLECTED_NUMBER_FORMAT
1261                         " / " COLLECTED_NUMBER_FORMAT
1262                         , st->id, rd->name
1263                         , rd->calculated_value
1264                         , rd->collected_value
1265                         , st->collected_total
1266                         );
1267                 break;
1268
1269             case RRDDIM_INCREMENTAL:
1270                 if(unlikely(rd->counter <= 1)) {
1271                     rd->calculated_value = 0;
1272                     continue;
1273                 }
1274
1275                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1276                 // to reset the calculation (it will give zero as the calculation for this second)
1277                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1278                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1279                             , st->name, rd->name
1280                             , rd->last_collected_value
1281                             , rd->collected_value);
1282                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1283                     rd->last_collected_value = rd->collected_value;
1284                 }
1285
1286                 rd->calculated_value +=
1287                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1288                     * (calculated_number)rd->multiplier
1289                     / (calculated_number)rd->divisor;
1290
1291                 if(unlikely(st->debug))
1292                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1293                         CALCULATED_NUMBER_FORMAT " = ("
1294                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1295                         ")"
1296                         " * " CALCULATED_NUMBER_FORMAT
1297                         " / " CALCULATED_NUMBER_FORMAT
1298                         , st->id, rd->name
1299                         , rd->calculated_value
1300                         , rd->collected_value, rd->last_collected_value
1301                         , (calculated_number)rd->multiplier
1302                         , (calculated_number)rd->divisor
1303                         );
1304                 break;
1305
1306             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1307                 if(unlikely(rd->counter <= 1)) {
1308                     rd->calculated_value = 0;
1309                     continue;
1310                 }
1311
1312                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1313                 // to reset the calculation (it will give zero as the calculation for this second)
1314                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1315                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1316                     , st->name, rd->name
1317                     , rd->last_collected_value
1318                     , rd->collected_value);
1319                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1320                     rd->last_collected_value = rd->collected_value;
1321                 }
1322
1323                 // the percentage of the current increment
1324                 // over the increment of all dimensions together
1325                 if(unlikely(st->collected_total == st->last_collected_total))
1326                     rd->calculated_value = 0;
1327                 else
1328                     rd->calculated_value =
1329                           (calculated_number)100
1330                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1331                         / (calculated_number)(st->collected_total - st->last_collected_total);
1332
1333                 if(unlikely(st->debug))
1334                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1335                         CALCULATED_NUMBER_FORMAT " = 100"
1336                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1337                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1338                         , st->id, rd->name
1339                         , rd->calculated_value
1340                         , rd->collected_value, rd->last_collected_value
1341                         , st->collected_total, st->last_collected_total
1342                         );
1343                 break;
1344
1345             default:
1346                 // make the default zero, to make sure
1347                 // it gets noticed when we add new types
1348                 rd->calculated_value = 0;
1349
1350                 if(unlikely(st->debug))
1351                     debug(D_RRD_STATS, "%s/%s: CALC "
1352                         CALCULATED_NUMBER_FORMAT " = 0"
1353                         , st->id, rd->name
1354                         , rd->calculated_value
1355                         );
1356                 break;
1357         }
1358
1359         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1360             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1361             " collected_value = " COLLECTED_NUMBER_FORMAT
1362             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1363             " calculated_value = " CALCULATED_NUMBER_FORMAT
1364             , st->id, rd->name
1365             , rd->last_collected_value
1366             , rd->collected_value
1367             , rd->last_calculated_value
1368             , rd->calculated_value
1369             );
1370
1371     }
1372
1373     // at this point we have all the calculated values ready
1374     // it is now time to interpolate values on a second boundary
1375
1376     if(unlikely(now_collect_ut < next_store_ut)) {
1377         // this is collected in the same interpolation point
1378         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1379 #ifdef NETDATA_INTERNAL_CHECKS
1380         info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1381 #endif
1382     }
1383
1384     usec_t first_ut = last_stored_ut;
1385     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1386     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1387
1388     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1389 #ifdef NETDATA_INTERNAL_CHECKS
1390         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); }
1391 #endif
1392
1393         if(unlikely(st->debug)) {
1394             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1395             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1396         }
1397
1398         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
1399         st->last_updated.tv_usec = 0;
1400
1401         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1402             calculated_number new_value;
1403
1404             switch(rd->algorithm) {
1405                 case RRDDIM_INCREMENTAL:
1406                     new_value = (calculated_number)
1407                         (      rd->calculated_value
1408                             * (calculated_number)(next_store_ut - last_collect_ut)
1409                             / (calculated_number)(now_collect_ut - last_collect_ut)
1410                         );
1411
1412                     if(unlikely(st->debug))
1413                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1414                             CALCULATED_NUMBER_FORMAT " = "
1415                             CALCULATED_NUMBER_FORMAT
1416                             " * %llu"
1417                             " / %llu"
1418                             , st->id, rd->name
1419                             , new_value
1420                             , rd->calculated_value
1421                             , (next_store_ut - last_stored_ut)
1422                             , (now_collect_ut - last_stored_ut)
1423                             );
1424
1425                     rd->calculated_value -= new_value;
1426                     new_value += rd->last_calculated_value;
1427                     rd->last_calculated_value = 0;
1428                     new_value /= (calculated_number)st->update_every;
1429
1430                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1431                         if(unlikely(st->debug))
1432                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1433                                 st->id, rd->name
1434                                 , (calculated_number)(next_store_ut - last_stored_ut)
1435                                 );
1436                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1437                     }
1438                     break;
1439
1440                 case RRDDIM_ABSOLUTE:
1441                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1442                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1443                 default:
1444                     if(iterations == 1) {
1445                         // this is the last iteration
1446                         // do not interpolate
1447                         // just show the calculated value
1448
1449                         new_value = rd->calculated_value;
1450                     }
1451                     else {
1452                         // we have missed an update
1453                         // interpolate in the middle values
1454
1455                         new_value = (calculated_number)
1456                             (   (     (rd->calculated_value - rd->last_calculated_value)
1457                                     * (calculated_number)(next_store_ut - last_collect_ut)
1458                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1459                                 )
1460                                 +  rd->last_calculated_value
1461                             );
1462
1463                         if(unlikely(st->debug))
1464                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1465                                 CALCULATED_NUMBER_FORMAT " = ((("
1466                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1467                                 " * %llu"
1468                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1469                                 , st->id, rd->name
1470                                 , new_value
1471                                 , rd->calculated_value, rd->last_calculated_value
1472                                 , (next_store_ut - first_ut)
1473                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1474                                 );
1475                     }
1476                     break;
1477             }
1478
1479             if(unlikely(!store_this_entry)) {
1480                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1481                 continue;
1482             }
1483
1484             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1485                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1486                 rd->last_stored_value = new_value;
1487
1488                 if(unlikely(st->debug))
1489                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1490                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1491                         , st->id, rd->name
1492                         , st->current_entry
1493                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1494                         );
1495             }
1496             else {
1497                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1498                         , st->id, rd->name
1499                         , st->current_entry
1500                         );
1501                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1502                 rd->last_stored_value = NAN;
1503             }
1504
1505             stored_entries++;
1506
1507             if(unlikely(st->debug)) {
1508                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1509                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1510                 calculated_number accuracy = accuracy_loss(t1, t2);
1511                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1512                         , st->id, rd->name
1513                         , st->current_entry
1514                         , t2
1515                         , get_storage_number_flags(rd->values[st->current_entry])
1516                         , t1
1517                         , accuracy
1518                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1519                         );
1520
1521                 rd->collected_volume += t1;
1522                 rd->stored_volume += t2;
1523                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1524                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1525                         , st->id, rd->name
1526                         , st->current_entry
1527                         , rd->stored_volume
1528                         , rd->collected_volume
1529                         , accuracy
1530                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1531                         );
1532
1533             }
1534         }
1535         // reset the storage flags for the next point, if any;
1536         storage_flags = SN_EXISTS;
1537
1538         st->counter++;
1539         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1540         last_stored_ut = next_store_ut;
1541     }
1542
1543     st->last_collected_total  = st->collected_total;
1544
1545     for( rd = st->dimensions; rd ; rd = rd->next ) {
1546         if(unlikely(!rd->updated)) continue;
1547
1548         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);
1549         rd->last_collected_value = rd->collected_value;
1550
1551         switch(rd->algorithm) {
1552             case RRDDIM_INCREMENTAL:
1553                 if(unlikely(!first_entry)) {
1554                     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);
1555                     rd->last_calculated_value += rd->calculated_value;
1556                 }
1557                 else {
1558                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1559                 }
1560                 break;
1561
1562             case RRDDIM_ABSOLUTE:
1563             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1564             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1565                 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);
1566                 rd->last_calculated_value = rd->calculated_value;
1567                 break;
1568         }
1569
1570         rd->calculated_value = 0;
1571         rd->collected_value = 0;
1572         rd->updated = 0;
1573
1574         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1575             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1576             " collected_value = " COLLECTED_NUMBER_FORMAT
1577             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1578             " calculated_value = " CALCULATED_NUMBER_FORMAT
1579             , st->id, rd->name
1580             , rd->last_collected_value
1581             , rd->collected_value
1582             , rd->last_calculated_value
1583             , rd->calculated_value
1584             );
1585     }
1586
1587     // ALL DONE ABOUT THE DATA UPDATE
1588     // --------------------------------------------------------------------
1589
1590 /*
1591     // find if there are any obsolete dimensions (not updated recently)
1592     if(unlikely(rrd_delete_unupdated_dimensions)) {
1593
1594         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1595             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1596                 break;
1597
1598         if(unlikely(rd)) {
1599             RRDDIM *last;
1600             // there is dimension to free
1601             // upgrade our read lock to a write lock
1602             pthread_rwlock_unlock(&st->rwlock);
1603             pthread_rwlock_wrlock(&st->rwlock);
1604
1605             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1606                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1607
1608                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1609                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1610
1611                     if(unlikely(!last)) {
1612                         st->dimensions = rd->next;
1613                         rd->next = NULL;
1614                         rrddim_free(st, rd);
1615                         rd = st->dimensions;
1616                         continue;
1617                     }
1618                     else {
1619                         last->next = rd->next;
1620                         rd->next = NULL;
1621                         rrddim_free(st, rd);
1622                         rd = last->next;
1623                         continue;
1624                     }
1625                 }
1626
1627                 last = rd;
1628                 rd = rd->next;
1629             }
1630
1631             if(unlikely(!st->dimensions)) {
1632                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1633                 st->enabled = 0;
1634             }
1635         }
1636     }
1637 */
1638
1639     pthread_rwlock_unlock(&st->rwlock);
1640
1641     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1642         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1643
1644     return(st->usec_since_last_update);
1645 }