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 RRD_MEMORY_MODE 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(RRDHOST *host, const char *id) {
 109     RRDFAMILY *rc = rrdfamily_index_find(host, 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(host, 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(RRDHOST *host, RRDFAMILY *rc) {
 129     rc->use_count--;
 130     if(!rc->use_count) {
 131         RRDFAMILY *ret = rrdfamily_index_del(host, 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             .id = id,
 231             .hash = (hash)?hash:simple_hash(id)
 232     };
 233     return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // chart types
 238
 239 inline RRDSET_TYPE rrdset_type_id(const char *name) {
 240     if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0))
 241         return RRDSET_TYPE_AREA;
 242
 243     else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0))
 244         return RRDSET_TYPE_STACKED;
 245
 246     else // if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0))
 247         return RRDSET_TYPE_LINE;
 248 }
 249
 250 const char *rrdset_type_name(RRDSET_TYPE chart_type) {
 251     switch(chart_type) {
 252         case RRDSET_TYPE_LINE:
 253         default:
 254             return RRDSET_TYPE_LINE_NAME;
 255
 256         case RRDSET_TYPE_AREA:
 257             return RRDSET_TYPE_AREA_NAME;
 258
 259         case RRDSET_TYPE_STACKED:
 260             return RRDSET_TYPE_STACKED_NAME;
 261     }
 262 }
 263
 264 // ----------------------------------------------------------------------------
 265 // load / save
 266
 267 inline const char *rrd_memory_mode_name(RRD_MEMORY_MODE id) {
 268     switch(id) {
 269         case RRD_MEMORY_MODE_RAM:
 270             return RRD_MEMORY_MODE_RAM_NAME;
 271
 272         case RRD_MEMORY_MODE_MAP:
 273             return RRD_MEMORY_MODE_MAP_NAME;
 274
 275         case RRD_MEMORY_MODE_SAVE:
 276         default:
 277             return RRD_MEMORY_MODE_SAVE_NAME;
 278     }
 279 }
 280
 281 int rrd_memory_mode_id(const char *name)
 282 {
 283     if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
 284         return RRD_MEMORY_MODE_RAM;
 285     else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
 286         return RRD_MEMORY_MODE_MAP;
 287
 288     return RRD_MEMORY_MODE_SAVE;
 289 }
 290
 291 // ----------------------------------------------------------------------------
 292 // algorithms types
 293
 294 RRDDIM_ALGORITHM rrddim_algorithm_id(const char *name)
 295 {
 296     if(strcmp(name, RRDDIM_ALGORITHM_INCREMENTAL_NAME) == 0)
 297         return RRDDIM_ALGORITHM_INCREMENTAL;
 298
 299     else if(strcmp(name, RRDDIM_ALGORITHM_ABSOLUTE_NAME) == 0)
 300         return RRDDIM_ALGORITHM_ABSOLUTE;
 301
 302     else if(strcmp(name, RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME) == 0)
 303         return RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL;
 304
 305     else if(strcmp(name, RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)
 306         return RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL;
 307
 308     else
 309         return RRDDIM_ALGORITHM_ABSOLUTE;
 310 }
 311
 312 const char *rrddim_algorithm_name(RRDDIM_ALGORITHM algorithm)
 313 {
 314     switch(algorithm) {
 315         case RRDDIM_ALGORITHM_ABSOLUTE:
 316         default:
 317             return RRDDIM_ALGORITHM_ABSOLUTE_NAME;
 318
 319         case RRDDIM_ALGORITHM_INCREMENTAL:
 320             return RRDDIM_ALGORITHM_INCREMENTAL_NAME;
 321
 322         case RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL:
 323             return RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME;
 324
 325         case RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
 326             return RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME;
 327     }
 328 }
 329
 330 // ----------------------------------------------------------------------------
 331 // chart names
 332
 333 char *rrdset_strncpyz_name(char *to, const char *from, size_t length)
 334 {
 335     char c, *p = to;
 336
 337     while (length-- && (c = *from++)) {
 338         if(c != '.' && !isalnum(c))
 339             c = '_';
 340
 341         *p++ = c;
 342     }
 343
 344     *p = '\0';
 345
 346     return to;
 347 }
 348
 349 void rrdset_set_name(RRDSET *st, const char *name)
 350 {
 351     if(unlikely(st->name && !strcmp(st->name, name)))
 352         return;
 353
 354     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 355
 356     char b[CONFIG_MAX_VALUE + 1];
 357     char n[RRD_ID_LENGTH_MAX + 1];
 358
 359     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 360     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 361
 362     if(st->name) {
 363         rrdset_index_del_name(st->rrdhost, st);
 364         st->name = config_set_default(st->id, "name", b);
 365         st->hash_name = simple_hash(st->name);
 366         rrdsetvar_rename_all(st);
 367     }
 368     else {
 369         st->name = config_get(st->id, "name", b);
 370         st->hash_name = simple_hash(st->name);
 371     }
 372
 373     pthread_rwlock_wrlock(&st->rwlock);
 374     RRDDIM *rd;
 375     for(rd = st->dimensions; rd ;rd = rd->next)
 376         rrddimvar_rename_all(rd);
 377     pthread_rwlock_unlock(&st->rwlock);
 378
 379     if(unlikely(rrdset_index_add_name(st->rrdhost, st) != st))
 380         error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
 381 }
 382
 383 // ----------------------------------------------------------------------------
 384 // cache directory
 385
 386 char *rrdset_cache_dir(const char *id)
 387 {
 388     char *ret = NULL;
 389
 390     char b[FILENAME_MAX + 1];
 391     char n[FILENAME_MAX + 1];
 392     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 393
 394     snprintfz(n, FILENAME_MAX, "%s/%s", netdata_configured_cache_dir, b);
 395     ret = config_get(id, "cache directory", n);
 396
 397     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 398         int r = mkdir(ret, 0775);
 399         if(r != 0 && errno != EEXIST)
 400             error("Cannot create directory '%s'", ret);
 401     }
 402
 403     return ret;
 404 }
 405
 406 // ----------------------------------------------------------------------------
 407 // core functions
 408
 409 void rrdset_reset(RRDSET *st)
 410 {
 411     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 412
 413     st->last_collected_time.tv_sec = 0;
 414     st->last_collected_time.tv_usec = 0;
 415     st->last_updated.tv_sec = 0;
 416     st->last_updated.tv_usec = 0;
 417     st->current_entry = 0;
 418     st->counter = 0;
 419     st->counter_done = 0;
 420
 421     RRDDIM *rd;
 422     for(rd = st->dimensions; rd ; rd = rd->next) {
 423         rd->last_collected_time.tv_sec = 0;
 424         rd->last_collected_time.tv_usec = 0;
 425         rd->counter = 0;
 426         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 427     }
 428 }
 429 static inline long align_entries_to_pagesize(long entries) {
 430     if(entries < 5) entries = 5;
 431     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 432
 433 #ifdef NETDATA_LOG_ALLOCATIONS
 434     long page = (size_t)sysconf(_SC_PAGESIZE);
 435
 436     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 437     if(size % page) {
 438         size -= (size % page);
 439         size += page;
 440
 441         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 442         return n;
 443     }
 444
 445     return entries;
 446 #else
 447     return entries;
 448 #endif
 449 }
 450
 451 static inline void timeval_align(struct timeval *tv, int update_every) {
 452     tv->tv_sec -= tv->tv_sec % update_every;
 453     tv->tv_usec = 500000;
 454 }
 455
 456 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) {
 457     RRDHOST *host = &localhost;
 458
 459     if(!type || !type[0]) {
 460         fatal("Cannot create rrd stats without a type.");
 461         return NULL;
 462     }
 463
 464     if(!id || !id[0]) {
 465         fatal("Cannot create rrd stats without an id.");
 466         return NULL;
 467     }
 468
 469     char fullid[RRD_ID_LENGTH_MAX + 1];
 470     char fullfilename[FILENAME_MAX + 1];
 471
 472     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 473
 474     RRDSET *st = rrdset_find(host, fullid);
 475     if(st) {
 476         debug(D_RRD_CALLS, "RRDSET '%s', already exists.", fullid);
 477         return st;
 478     }
 479
 480     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 481     long entries = align_entries_to_pagesize(rentries);
 482     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 483
 484     int enabled = config_get_boolean(fullid, "enabled", 1);
 485     if(!enabled) entries = 5;
 486
 487     unsigned long size = sizeof(RRDSET);
 488     char *cache_dir = rrdset_cache_dir(fullid);
 489
 490     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 491
 492     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 493     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);
 494     if(st) {
 495         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 496             errno = 0;
 497             info("Initializing file %s.", fullfilename);
 498             memset(st, 0, size);
 499         }
 500         else if(strcmp(st->id, fullid) != 0) {
 501             errno = 0;
 502             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 503             // munmap(st, size);
 504             // st = NULL;
 505             memset(st, 0, size);
 506         }
 507         else if(st->memsize != size || st->entries != entries) {
 508             errno = 0;
 509             error("File %s does not have the desired size. Clearing it.", fullfilename);
 510             memset(st, 0, size);
 511         }
 512         else if(st->update_every != update_every) {
 513             errno = 0;
 514             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 515             memset(st, 0, size);
 516         }
 517         else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 518             errno = 0;
 519             error("File %s is too old. Clearing it.", fullfilename);
 520             memset(st, 0, size);
 521         }
 522
 523         // make sure the database is aligned
 524         if(st->last_updated.tv_sec)
 525             timeval_align(&st->last_updated, update_every);
 526     }
 527
 528     if(st) {
 529         st->name = NULL;
 530         st->type = NULL;
 531         st->family = NULL;
 532         st->context = NULL;
 533         st->title = NULL;
 534         st->units = NULL;
 535         st->dimensions = NULL;
 536         st->next = NULL;
 537         st->mapped = rrd_memory_mode;
 538         st->variables = NULL;
 539         st->alarms = NULL;
 540         memset(&st->rwlock, 0, sizeof(pthread_rwlock_t));
 541         memset(&st->avl, 0, sizeof(avl));
 542         memset(&st->avlname, 0, sizeof(avl));
 543         memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
 544         memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
 545     }
 546     else {
 547         st = callocz(1, size);
 548         st->mapped = RRD_MEMORY_MODE_RAM;
 549     }
 550
 551     st->rrdhost = host;
 552     st->memsize = size;
 553     st->entries = entries;
 554     st->update_every = update_every;
 555
 556     if(st->current_entry >= st->entries) st->current_entry = 0;
 557
 558     strcpy(st->cache_filename, fullfilename);
 559     strcpy(st->magic, RRDSET_MAGIC);
 560
 561     strcpy(st->id, fullid);
 562     st->hash = simple_hash(st->id);
 563
 564     st->cache_dir = cache_dir;
 565
 566     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 567     st->type       = config_get(st->id, "type", type);
 568     st->family     = config_get(st->id, "family", family?family:st->type);
 569     st->units      = config_get(st->id, "units", units?units:"");
 570
 571     st->context    = config_get(st->id, "context", context?context:st->id);
 572     st->hash_context = simple_hash(st->context);
 573
 574     st->priority = config_get_number(st->id, "priority", priority);
 575     st->enabled = enabled;
 576
 577     st->isdetail = 0;
 578     st->debug = 0;
 579
 580     // if(!strcmp(st->id, "disk_util.dm-0")) {
 581     //     st->debug = 1;
 582     //     error("enabled debugging for '%s'", st->id);
 583     // }
 584     // else error("not enabled debugging for '%s'", st->id);
 585
 586     st->green = NAN;
 587     st->red = NAN;
 588
 589     st->last_collected_time.tv_sec = 0;
 590     st->last_collected_time.tv_usec = 0;
 591     st->counter_done = 0;
 592
 593     st->gap_when_lost_iterations_above = (int) (
 594             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 595
 596     avl_init_lock(&st->dimensions_index, rrddim_compare);
 597     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 598
 599     pthread_rwlock_init(&st->rwlock, NULL);
 600     rrdhost_rwlock(host);
 601
 602     if(name && *name) rrdset_set_name(st, name);
 603     else rrdset_set_name(st, id);
 604
 605     {
 606         char varvalue[CONFIG_MAX_VALUE + 1];
 607         char varvalue2[CONFIG_MAX_VALUE + 1];
 608         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 609         json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
 610         st->title = config_get(st->id, "title", varvalue2);
 611     }
 612
 613     st->rrdfamily = rrdfamily_create(host, st->family);
 614
 615     st->next = host->rrdset_root;
 616     host->rrdset_root = st;
 617
 618     if(health_enabled) {
 619         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 620         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 621         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 622         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 623         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 624     }
 625
 626     if(unlikely(rrdset_index_add(host, st) != st))
 627         error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
 628
 629     rrdsetcalc_link_matching(st);
 630     rrdcalctemplate_link_matching(st);
 631
 632     rrdhost_unlock(host);
 633
 634     return(st);
 635 }
 636
 637 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, collected_number multiplier, collected_number divisor, RRDDIM_ALGORITHM algorithm)
 638 {
 639     RRDDIM *rd = rrddim_find(st, id);
 640     if(rd) {
 641         debug(D_RRD_CALLS, "Cannot create rrd dimension '%s/%s', it already exists.", st->id, name?name:"<NONAME>");
 642         return rd;
 643     }
 644
 645     char filename[FILENAME_MAX + 1];
 646     char fullfilename[FILENAME_MAX + 1];
 647
 648     char varname[CONFIG_MAX_NAME + 1];
 649     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 650
 651     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 652
 653     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 654     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 655
 656     if(rrd_memory_mode != RRD_MEMORY_MODE_RAM) {
 657         rd = (RRDDIM *) mymmap(fullfilename, size, ((rrd_memory_mode == RRD_MEMORY_MODE_MAP) ? MAP_SHARED : MAP_PRIVATE), 1);
 658         if(rd) {
 659             // we have a file mapped for rd
 660
 661             rd->id = NULL;
 662             rd->name = NULL;
 663             rd->cache_filename = NULL;
 664             rd->memory_mode = rrd_memory_mode;
 665             rd->flags = 0x00000000;
 666             rd->variables = NULL;
 667             rd->next = NULL;
 668             rd->rrdset = NULL;
 669             memset(&rd->avl, 0, sizeof(avl));
 670
 671             struct timeval now;
 672             now_realtime_timeval(&now);
 673
 674             if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 675                 errno = 0;
 676                 info("Initializing file %s.", fullfilename);
 677                 memset(rd, 0, size);
 678             }
 679             else if(rd->memsize != size) {
 680                 errno = 0;
 681                 error("File %s does not have the desired size. Clearing it.", fullfilename);
 682                 memset(rd, 0, size);
 683             }
 684             else if(rd->multiplier != multiplier) {
 685                 errno = 0;
 686                 error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 687                 memset(rd, 0, size);
 688             }
 689             else if(rd->divisor != divisor) {
 690                 errno = 0;
 691                 error("File %s does not have the same divisor. Clearing it.", fullfilename);
 692                 memset(rd, 0, size);
 693             }
 694             else if(rd->update_every != st->update_every) {
 695                 errno = 0;
 696                 error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 697                 memset(rd, 0, size);
 698             }
 699             else if(dt_usec(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * USEC_PER_SEC)) {
 700                 errno = 0;
 701                 error("File %s is too old. Clearing it.", fullfilename);
 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 %u '%s', found %u '%s'). Previous values may be wrong."
 707                       , fullfilename, algorithm, rrddim_algorithm_name(algorithm), rd->algorithm,
 708                         rrddim_algorithm_name(rd->algorithm));
 709         }
 710     }
 711
 712     if(unlikely(!rd)) {
 713         // if we didn't manage to get a mmap'd dimension, just create one
 714         rd = callocz(1, size);
 715         rd->memory_mode = RRD_MEMORY_MODE_RAM;
 716     }
 717
 718     rd->memsize = size;
 719
 720     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 721
 722     rd->id = strdupz(id);
 723     rd->hash = simple_hash(rd->id);
 724
 725     rd->cache_filename = strdupz(fullfilename);
 726
 727     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 728     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 729     rd->hash_name = simple_hash(rd->name);
 730
 731     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 732     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 733
 734     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 735     rd->multiplier = config_get_number(st->id, varname, multiplier);
 736
 737     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 738     rd->divisor = config_get_number(st->id, varname, divisor);
 739     if(!rd->divisor) rd->divisor = 1;
 740
 741     rd->entries = st->entries;
 742     rd->update_every = st->update_every;
 743
 744     // prevent incremental calculation spikes
 745     rd->counter = 0;
 746     rrddim_flag_clear(rd, RRDDIM_FLAG_UPDATED);
 747     rd->calculated_value = 0;
 748     rd->last_calculated_value = 0;
 749     rd->collected_value = 0;
 750     rd->last_collected_value = 0;
 751     rd->collected_volume = 0;
 752     rd->stored_volume = 0;
 753     rd->last_stored_value = 0;
 754     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 755     rd->last_collected_time.tv_sec = 0;
 756     rd->last_collected_time.tv_usec = 0;
 757     rd->rrdset = st;
 758
 759     // append this dimension
 760     pthread_rwlock_wrlock(&st->rwlock);
 761     if(!st->dimensions)
 762         st->dimensions = rd;
 763     else {
 764         RRDDIM *td = st->dimensions;
 765         for(; td->next; td = td->next) ;
 766         td->next = rd;
 767     }
 768
 769     if(health_enabled) {
 770         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 771         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 772         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 773     }
 774
 775     pthread_rwlock_unlock(&st->rwlock);
 776
 777     if(unlikely(rrddim_index_add(st, rd) != rd))
 778         error("RRDDIM: INTERNAL ERROR: attempt to index duplicate dimension '%s' on chart '%s'", rd->id, st->id);
 779
 780     return(rd);
 781 }
 782
 783 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 784 {
 785     if(unlikely(!strcmp(rd->name, name)))
 786         return;
 787
 788     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 789
 790     char varname[CONFIG_MAX_NAME + 1];
 791     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 792     rd->name = config_set_default(st->id, varname, name);
 793     rd->hash_name = simple_hash(rd->name);
 794
 795     rrddimvar_rename_all(rd);
 796 }
 797
 798 void rrddim_free(RRDSET *st, RRDDIM *rd)
 799 {
 800     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 801
 802     if(rd == st->dimensions)
 803         st->dimensions = rd->next;
 804     else {
 805         RRDDIM *i;
 806         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 807
 808         if (i && i->next == rd)
 809             i->next = rd->next;
 810         else
 811             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 812     }
 813     rd->next = NULL;
 814
 815     while(rd->variables)
 816         rrddimvar_free(rd->variables);
 817
 818     if(unlikely(rrddim_index_del(st, rd) != rd))
 819         error("RRDDIM: INTERNAL ERROR: attempt to remove from index dimension '%s' on chart '%s', removed a different dimension.", rd->id, st->id);
 820
 821     // free(rd->annotations);
 822
 823     switch(rd->memory_mode) {
 824         case 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             // continue to map mode - no break;
 828
 829         case RRD_MEMORY_MODE_MAP:
 830             debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 831             freez((void *)rd->id);
 832             freez(rd->cache_filename);
 833             munmap(rd, rd->memsize);
 834             break;
 835
 836         case RRD_MEMORY_MODE_RAM:
 837             debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 838             freez((void *)rd->id);
 839             freez(rd->cache_filename);
 840             freez(rd);
 841             break;
 842     }
 843 }
 844
 845 void rrdset_free_all(void)
 846 {
 847     info("Freeing all memory...");
 848
 849     rrdhost_rwlock(&localhost);
 850
 851     RRDSET *st;
 852     for(st = localhost.rrdset_root; st ;) {
 853         RRDSET *next = st->next;
 854
 855         pthread_rwlock_wrlock(&st->rwlock);
 856
 857         while(st->variables)
 858             rrdsetvar_free(st->variables);
 859
 860         while(st->alarms)
 861             rrdsetcalc_unlink(st->alarms);
 862
 863         while(st->dimensions)
 864             rrddim_free(st, st->dimensions);
 865
 866         if(unlikely(rrdset_index_del(&localhost, st) != st))
 867             error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
 868
 869         rrdset_index_del_name(&localhost, st);
 870
 871         st->rrdfamily->use_count--;
 872         if(!st->rrdfamily->use_count)
 873             rrdfamily_free(&localhost, st->rrdfamily);
 874
 875         pthread_rwlock_unlock(&st->rwlock);
 876
 877         if(st->mapped == RRD_MEMORY_MODE_SAVE || st->mapped == RRD_MEMORY_MODE_MAP) {
 878             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 879             munmap(st, st->memsize);
 880         }
 881         else
 882             freez(st);
 883
 884         st = next;
 885     }
 886     localhost.rrdset_root = NULL;
 887
 888     rrdhost_unlock(&localhost);
 889
 890     info("Memory cleanup completed...");
 891 }
 892
 893 void rrdset_save_all(void) {
 894     info("Saving database...");
 895
 896     RRDSET *st;
 897     RRDDIM *rd;
 898
 899     // we get an write lock
 900     // to ensure only one thread is saving the database
 901     rrdhost_rwlock(&localhost);
 902
 903     for(st = localhost.rrdset_root; st ; st = st->next) {
 904         pthread_rwlock_rdlock(&st->rwlock);
 905
 906         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 907             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 908             savememory(st->cache_filename, st, st->memsize);
 909         }
 910
 911         for(rd = st->dimensions; rd ; rd = rd->next) {
 912             if(likely(rd->memory_mode == RRD_MEMORY_MODE_SAVE)) {
 913                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 914                 savememory(rd->cache_filename, rd, rd->memsize);
 915             }
 916         }
 917
 918         pthread_rwlock_unlock(&st->rwlock);
 919     }
 920
 921     rrdhost_unlock(&localhost);
 922 }
 923
 924
 925 RRDSET *rrdset_find(RRDHOST *host, const char *id) {
 926     debug(D_RRD_CALLS, "rrdset_find() for chart '%s' in host '%s'", id, host->hostname);
 927     RRDSET *st = rrdset_index_find(host, id, 0);
 928     return(st);
 929 }
 930
 931 RRDSET *rrdset_find_bytype(RRDHOST *host, const char *type, const char *id)
 932 {
 933     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart '%s.%s' in host '%s'", type, id, host->hostname);
 934
 935     char buf[RRD_ID_LENGTH_MAX + 1];
 936     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 937     strcat(buf, ".");
 938     int len = (int) strlen(buf);
 939     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 940
 941     return(rrdset_find(host, buf));
 942 }
 943
 944 RRDSET *rrdset_find_byname(RRDHOST *host, const char *name) {
 945     debug(D_RRD_CALLS, "rrdset_find_byname() for chart '%s' in host '%s'", name, host->hostname);
 946     RRDSET *st = rrdset_index_find_name(host, name, 0);
 947     return(st);
 948 }
 949
 950 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 951 {
 952     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 953
 954     return rrddim_index_find(st, id, 0);
 955 }
 956
 957 int rrddim_hide(RRDSET *st, const char *id)
 958 {
 959     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 960
 961     RRDDIM *rd = rrddim_find(st, id);
 962     if(unlikely(!rd)) {
 963         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 964         return 1;
 965     }
 966
 967     rrddim_flag_set(rd, RRDDIM_FLAG_HIDDEN);
 968     return 0;
 969 }
 970
 971 int rrddim_unhide(RRDSET *st, const char *id) {
 972     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 973
 974     RRDDIM *rd = rrddim_find(st, id);
 975     if(unlikely(!rd)) {
 976         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 977         return 1;
 978     }
 979
 980     rrddim_flag_clear(rd, RRDDIM_FLAG_HIDDEN);
 981     return 0;
 982 }
 983
 984 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 985 {
 986     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 987
 988     now_realtime_timeval(&rd->last_collected_time);
 989     rd->collected_value = value;
 990     rrddim_flag_set(rd, RRDDIM_FLAG_UPDATED);
 991     rd->counter++;
 992
 993     // 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));
 994
 995     return rd->last_collected_value;
 996 }
 997
 998 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 999 {
1000     RRDDIM *rd = rrddim_find(st, id);
1001     if(unlikely(!rd)) {
1002         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
1003         return 0;
1004     }
1005
1006     return rrddim_set_by_pointer(st, rd, value);
1007 }
1008
1009 void rrdset_next_usec_unfiltered(RRDSET *st, usec_t microseconds)
1010 {
1011     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
1012         // the first entry
1013         microseconds = st->update_every * USEC_PER_SEC;
1014     }
1015     st->usec_since_last_update = microseconds;
1016 }
1017
1018 void rrdset_next_usec(RRDSET *st, usec_t microseconds)
1019 {
1020     struct timeval now;
1021     now_realtime_timeval(&now);
1022
1023     if(unlikely(!st->last_collected_time.tv_sec)) {
1024         // the first entry
1025         microseconds = st->update_every * USEC_PER_SEC;
1026     }
1027     else if(unlikely(!microseconds)) {
1028         // no dt given by the plugin
1029         microseconds = dt_usec(&now, &st->last_collected_time);
1030     }
1031     else {
1032         // microseconds has the time since the last collection
1033 #ifdef NETDATA_INTERNAL_CHECKS
1034         usec_t now_usec = timeval_usec(&now);
1035         usec_t last_usec = timeval_usec(&st->last_collected_time);
1036 #endif
1037         usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
1038
1039         // verify the microseconds given is good
1040         if(unlikely(microseconds > since_last_usec)) {
1041             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);
1042
1043 #ifdef NETDATA_INTERNAL_CHECKS
1044             if(unlikely(last_usec + microseconds > now_usec + 1000))
1045                 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);
1046 #endif
1047
1048             microseconds = since_last_usec;
1049         }
1050         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1051             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);
1052
1053 #ifdef NETDATA_INTERNAL_CHECKS
1054             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);
1055 #endif
1056             microseconds = since_last_usec;
1057         }
1058     }
1059     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1060
1061     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1062     st->usec_since_last_update = microseconds;
1063 }
1064
1065 usec_t rrdset_done(RRDSET *st)
1066 {
1067     if(unlikely(netdata_exit)) return 0;
1068
1069     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1070
1071     RRDDIM *rd;
1072
1073     int
1074         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1075
1076     char
1077         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1078         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1079
1080     unsigned int
1081         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1082
1083     usec_t
1084         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1085         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1086         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1087         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1088         update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
1089
1090     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1091         error("Cannot set pthread cancel state to DISABLE.");
1092
1093     // a read lock is OK here
1094     pthread_rwlock_rdlock(&st->rwlock);
1095
1096 /*
1097     // enable the chart, if it was disabled
1098     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1099         st->enabled = 1;
1100 */
1101
1102     // check if the chart has a long time to be updated
1103     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1104         info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1105         rrdset_reset(st);
1106         st->usec_since_last_update = update_every_ut;
1107         first_entry = 1;
1108     }
1109     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1110
1111     // set last_collected_time
1112     if(unlikely(!st->last_collected_time.tv_sec)) {
1113         // it is the first entry
1114         // set the last_collected_time to now
1115         now_realtime_timeval(&st->last_collected_time);
1116         timeval_align(&st->last_collected_time, st->update_every);
1117
1118         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
1119
1120         // the first entry should not be stored
1121         store_this_entry = 0;
1122         first_entry = 1;
1123
1124         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);
1125     }
1126     else {
1127         // it is not the first entry
1128         // calculate the proper last_collected_time, using usec_since_last_update
1129         last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1130         usec_t ut = last_collect_ut + st->usec_since_last_update;
1131         st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
1132         st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1133     }
1134
1135     // if this set has not been updated in the past
1136     // we fake the last_update time to be = now - usec_since_last_update
1137     if(unlikely(!st->last_updated.tv_sec)) {
1138         // it has never been updated before
1139         // set a fake last_updated, in the past using usec_since_last_update
1140         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1141         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1142         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1143
1144         // the first entry should not be stored
1145         store_this_entry = 0;
1146         first_entry = 1;
1147
1148         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);
1149     }
1150
1151     // check if we will re-write the entire data set
1152     if(unlikely(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1153         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);
1154         rrdset_reset(st);
1155
1156         st->usec_since_last_update = update_every_ut;
1157
1158         now_realtime_timeval(&st->last_collected_time);
1159         timeval_align(&st->last_collected_time, st->update_every);
1160
1161         usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
1162         st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
1163         st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
1164
1165         // the first entry should not be stored
1166         store_this_entry = 0;
1167         first_entry = 1;
1168     }
1169
1170     // these are the 3 variables that will help us in interpolation
1171     // last_stored_ut = the last time we added a value to the storage
1172     // now_collect_ut = the time the current value has been collected
1173     // next_store_ut  = the time of the next interpolation point
1174     last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
1175     now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
1176     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
1177
1178     if(unlikely(st->debug)) {
1179         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1180         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1181         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1182         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1183     }
1184
1185     if(unlikely(!st->counter_done)) {
1186         store_this_entry = 0;
1187         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1188     }
1189     st->counter_done++;
1190
1191     // calculate totals and count the dimensions
1192     int dimensions;
1193     st->collected_total = 0;
1194     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1195         if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
1196             st->collected_total += rd->collected_value;
1197
1198     uint32_t storage_flags = SN_EXISTS;
1199
1200     // process all dimensions to calculate their values
1201     // based on the collected figures only
1202     // at this stage we do not interpolate anything
1203     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1204
1205         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED))) {
1206             rd->calculated_value = 0;
1207             continue;
1208         }
1209
1210         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1211             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1212             " collected_value = " COLLECTED_NUMBER_FORMAT
1213             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1214             " calculated_value = " CALCULATED_NUMBER_FORMAT
1215             , st->id, rd->name
1216             , rd->last_collected_value
1217             , rd->collected_value
1218             , rd->last_calculated_value
1219             , rd->calculated_value
1220             );
1221
1222         switch(rd->algorithm) {
1223             case RRDDIM_ALGORITHM_ABSOLUTE:
1224                 rd->calculated_value = (calculated_number)rd->collected_value
1225                     * (calculated_number)rd->multiplier
1226                     / (calculated_number)rd->divisor;
1227
1228                 if(unlikely(st->debug))
1229                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1230                         CALCULATED_NUMBER_FORMAT " = "
1231                         COLLECTED_NUMBER_FORMAT
1232                         " * " CALCULATED_NUMBER_FORMAT
1233                         " / " CALCULATED_NUMBER_FORMAT
1234                         , st->id, rd->name
1235                         , rd->calculated_value
1236                         , rd->collected_value
1237                         , (calculated_number)rd->multiplier
1238                         , (calculated_number)rd->divisor
1239                         );
1240                 break;
1241
1242             case RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1243                 if(unlikely(!st->collected_total))
1244                     rd->calculated_value = 0;
1245                 else
1246                     // the percentage of the current value
1247                     // over the total of all dimensions
1248                     rd->calculated_value =
1249                           (calculated_number)100
1250                         * (calculated_number)rd->collected_value
1251                         / (calculated_number)st->collected_total;
1252
1253                 if(unlikely(st->debug))
1254                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1255                         CALCULATED_NUMBER_FORMAT " = 100"
1256                         " * " COLLECTED_NUMBER_FORMAT
1257                         " / " COLLECTED_NUMBER_FORMAT
1258                         , st->id, rd->name
1259                         , rd->calculated_value
1260                         , rd->collected_value
1261                         , st->collected_total
1262                         );
1263                 break;
1264
1265             case RRDDIM_ALGORITHM_INCREMENTAL:
1266                 if(unlikely(rd->counter <= 1)) {
1267                     rd->calculated_value = 0;
1268                     continue;
1269                 }
1270
1271                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1272                 // to reset the calculation (it will give zero as the calculation for this second)
1273                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1274                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1275                             , st->name, rd->name
1276                             , rd->last_collected_value
1277                             , rd->collected_value);
1278
1279                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
1280                         storage_flags = SN_EXISTS_RESET;
1281
1282                     rd->last_collected_value = rd->collected_value;
1283                 }
1284
1285                 rd->calculated_value +=
1286                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1287                     * (calculated_number)rd->multiplier
1288                     / (calculated_number)rd->divisor;
1289
1290                 if(unlikely(st->debug))
1291                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1292                         CALCULATED_NUMBER_FORMAT " = ("
1293                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1294                         ")"
1295                         " * " CALCULATED_NUMBER_FORMAT
1296                         " / " CALCULATED_NUMBER_FORMAT
1297                         , st->id, rd->name
1298                         , rd->calculated_value
1299                         , rd->collected_value, rd->last_collected_value
1300                         , (calculated_number)rd->multiplier
1301                         , (calculated_number)rd->divisor
1302                         );
1303                 break;
1304
1305             case RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1306                 if(unlikely(rd->counter <= 1)) {
1307                     rd->calculated_value = 0;
1308                     continue;
1309                 }
1310
1311                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1312                 // to reset the calculation (it will give zero as the calculation for this second)
1313                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1314                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1315                     , st->name, rd->name
1316                     , rd->last_collected_value
1317                     , rd->collected_value);
1318
1319                     if(!(rrddim_flag_check(rd, RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)))
1320                         storage_flags = SN_EXISTS_RESET;
1321
1322                     rd->last_collected_value = rd->collected_value;
1323                 }
1324
1325                 // the percentage of the current increment
1326                 // over the increment of all dimensions together
1327                 if(unlikely(st->collected_total == st->last_collected_total))
1328                     rd->calculated_value = 0;
1329                 else
1330                     rd->calculated_value =
1331                           (calculated_number)100
1332                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1333                         / (calculated_number)(st->collected_total - st->last_collected_total);
1334
1335                 if(unlikely(st->debug))
1336                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1337                         CALCULATED_NUMBER_FORMAT " = 100"
1338                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1339                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1340                         , st->id, rd->name
1341                         , rd->calculated_value
1342                         , rd->collected_value, rd->last_collected_value
1343                         , st->collected_total, st->last_collected_total
1344                         );
1345                 break;
1346
1347             default:
1348                 // make the default zero, to make sure
1349                 // it gets noticed when we add new types
1350                 rd->calculated_value = 0;
1351
1352                 if(unlikely(st->debug))
1353                     debug(D_RRD_STATS, "%s/%s: CALC "
1354                         CALCULATED_NUMBER_FORMAT " = 0"
1355                         , st->id, rd->name
1356                         , rd->calculated_value
1357                         );
1358                 break;
1359         }
1360
1361         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1362             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1363             " collected_value = " COLLECTED_NUMBER_FORMAT
1364             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1365             " calculated_value = " CALCULATED_NUMBER_FORMAT
1366             , st->id, rd->name
1367             , rd->last_collected_value
1368             , rd->collected_value
1369             , rd->last_calculated_value
1370             , rd->calculated_value
1371             );
1372
1373     }
1374
1375     // at this point we have all the calculated values ready
1376     // it is now time to interpolate values on a second boundary
1377
1378     if(unlikely(now_collect_ut < next_store_ut)) {
1379         // this is collected in the same interpolation point
1380         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1381 #ifdef NETDATA_INTERNAL_CHECKS
1382         info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1383 #endif
1384     }
1385
1386     usec_t first_ut = last_stored_ut;
1387     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1388     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1389
1390     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1391 #ifdef NETDATA_INTERNAL_CHECKS
1392         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); }
1393 #endif
1394
1395         if(unlikely(st->debug)) {
1396             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1397             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1398         }
1399
1400         st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
1401         st->last_updated.tv_usec = 0;
1402
1403         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1404             calculated_number new_value;
1405
1406             switch(rd->algorithm) {
1407                 case RRDDIM_ALGORITHM_INCREMENTAL:
1408                     new_value = (calculated_number)
1409                         (      rd->calculated_value
1410                             * (calculated_number)(next_store_ut - last_collect_ut)
1411                             / (calculated_number)(now_collect_ut - last_collect_ut)
1412                         );
1413
1414                     if(unlikely(st->debug))
1415                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1416                             CALCULATED_NUMBER_FORMAT " = "
1417                             CALCULATED_NUMBER_FORMAT
1418                             " * %llu"
1419                             " / %llu"
1420                             , st->id, rd->name
1421                             , new_value
1422                             , rd->calculated_value
1423                             , (next_store_ut - last_stored_ut)
1424                             , (now_collect_ut - last_stored_ut)
1425                             );
1426
1427                     rd->calculated_value -= new_value;
1428                     new_value += rd->last_calculated_value;
1429                     rd->last_calculated_value = 0;
1430                     new_value /= (calculated_number)st->update_every;
1431
1432                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1433                         if(unlikely(st->debug))
1434                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1435                                 st->id, rd->name
1436                                 , (calculated_number)(next_store_ut - last_stored_ut)
1437                                 );
1438                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1439                     }
1440                     break;
1441
1442                 case RRDDIM_ALGORITHM_ABSOLUTE:
1443                 case RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1444                 case RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1445                 default:
1446                     if(iterations == 1) {
1447                         // this is the last iteration
1448                         // do not interpolate
1449                         // just show the calculated value
1450
1451                         new_value = rd->calculated_value;
1452                     }
1453                     else {
1454                         // we have missed an update
1455                         // interpolate in the middle values
1456
1457                         new_value = (calculated_number)
1458                             (   (     (rd->calculated_value - rd->last_calculated_value)
1459                                     * (calculated_number)(next_store_ut - last_collect_ut)
1460                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1461                                 )
1462                                 +  rd->last_calculated_value
1463                             );
1464
1465                         if(unlikely(st->debug))
1466                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1467                                 CALCULATED_NUMBER_FORMAT " = ((("
1468                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1469                                 " * %llu"
1470                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1471                                 , st->id, rd->name
1472                                 , new_value
1473                                 , rd->calculated_value, rd->last_calculated_value
1474                                 , (next_store_ut - first_ut)
1475                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1476                                 );
1477                     }
1478                     break;
1479             }
1480
1481             if(unlikely(!store_this_entry)) {
1482                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1483                 continue;
1484             }
1485
1486             if(likely(rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED) && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1487                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1488                 rd->last_stored_value = new_value;
1489
1490                 if(unlikely(st->debug))
1491                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1492                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1493                         , st->id, rd->name
1494                         , st->current_entry
1495                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1496                         );
1497             }
1498             else {
1499                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1500                         , st->id, rd->name
1501                         , st->current_entry
1502                         );
1503                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1504                 rd->last_stored_value = NAN;
1505             }
1506
1507             stored_entries++;
1508
1509             if(unlikely(st->debug)) {
1510                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1511                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1512                 calculated_number accuracy = accuracy_loss(t1, t2);
1513                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1514                         , st->id, rd->name
1515                         , st->current_entry
1516                         , t2
1517                         , get_storage_number_flags(rd->values[st->current_entry])
1518                         , t1
1519                         , accuracy
1520                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1521                         );
1522
1523                 rd->collected_volume += t1;
1524                 rd->stored_volume += t2;
1525                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1526                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1527                         , st->id, rd->name
1528                         , st->current_entry
1529                         , rd->stored_volume
1530                         , rd->collected_volume
1531                         , accuracy
1532                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1533                         );
1534
1535             }
1536         }
1537         // reset the storage flags for the next point, if any;
1538         storage_flags = SN_EXISTS;
1539
1540         st->counter++;
1541         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1542         last_stored_ut = next_store_ut;
1543     }
1544
1545     st->last_collected_total  = st->collected_total;
1546
1547     for( rd = st->dimensions; rd ; rd = rd->next ) {
1548         if(unlikely(!rrddim_flag_check(rd, RRDDIM_FLAG_UPDATED)))
1549             continue;
1550
1551         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);
1552         rd->last_collected_value = rd->collected_value;
1553
1554         switch(rd->algorithm) {
1555             case RRDDIM_ALGORITHM_INCREMENTAL:
1556                 if(unlikely(!first_entry)) {
1557                     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);
1558                     rd->last_calculated_value += rd->calculated_value;
1559                 }
1560                 else {
1561                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1562                 }
1563                 break;
1564
1565             case RRDDIM_ALGORITHM_ABSOLUTE:
1566             case RRDDIM_ALGORITHM_PCENT_OVER_ROW_TOTAL:
1567             case RRDDIM_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
1568                 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);
1569                 rd->last_calculated_value = rd->calculated_value;
1570                 break;
1571         }
1572
1573         rd->calculated_value = 0;
1574         rd->collected_value = 0;
1575         rrddim_flag_clear(rd, RRDDIM_FLAG_UPDATED);
1576
1577         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1578             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1579             " collected_value = " COLLECTED_NUMBER_FORMAT
1580             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1581             " calculated_value = " CALCULATED_NUMBER_FORMAT
1582             , st->id, rd->name
1583             , rd->last_collected_value
1584             , rd->collected_value
1585             , rd->last_calculated_value
1586             , rd->calculated_value
1587             );
1588     }
1589
1590     // ALL DONE ABOUT THE DATA UPDATE
1591     // --------------------------------------------------------------------
1592
1593 /*
1594     // find if there are any obsolete dimensions (not updated recently)
1595     if(unlikely(rrd_delete_unupdated_dimensions)) {
1596
1597         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1598             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1599                 break;
1600
1601         if(unlikely(rd)) {
1602             RRDDIM *last;
1603             // there is dimension to free
1604             // upgrade our read lock to a write lock
1605             pthread_rwlock_unlock(&st->rwlock);
1606             pthread_rwlock_wrlock(&st->rwlock);
1607
1608             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1609                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1610
1611                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1612                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1613
1614                     if(unlikely(!last)) {
1615                         st->dimensions = rd->next;
1616                         rd->next = NULL;
1617                         rrddim_free(st, rd);
1618                         rd = st->dimensions;
1619                         continue;
1620                     }
1621                     else {
1622                         last->next = rd->next;
1623                         rd->next = NULL;
1624                         rrddim_free(st, rd);
1625                         rd = last->next;
1626                         continue;
1627                     }
1628                 }
1629
1630                 last = rd;
1631                 rd = rd->next;
1632             }
1633
1634             if(unlikely(!st->dimensions)) {
1635                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1636                 st->enabled = 0;
1637             }
1638         }
1639     }
1640 */
1641
1642     pthread_rwlock_unlock(&st->rwlock);
1643
1644     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1645         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1646
1647     return(st->usec_since_last_update);
1648 }