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 = time(NULL);
  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("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("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("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) avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
 226 #define rrddim_index_del(st,rd ) 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     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 357
 358     if(st->name) {
 359         rrdset_index_del_name(&localhost, st);
 360         rrdsetvar_rename_all(st);
 361     }
 362
 363     char b[CONFIG_MAX_VALUE + 1];
 364     char n[RRD_ID_LENGTH_MAX + 1];
 365
 366     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 367     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 368     st->name = config_get(st->id, "name", b);
 369     st->hash_name = simple_hash(st->name);
 370
 371     rrdset_index_add_name(&localhost, st);
 372 }
 373
 374 // ----------------------------------------------------------------------------
 375 // cache directory
 376
 377 char *rrdset_cache_dir(const char *id)
 378 {
 379     char *ret = NULL;
 380
 381     static char *cache_dir = NULL;
 382     if(!cache_dir) {
 383         cache_dir = config_get("global", "cache directory", CACHE_DIR);
 384         int r = mkdir(cache_dir, 0755);
 385         if(r != 0 && errno != EEXIST)
 386             error("Cannot create directory '%s'", cache_dir);
 387     }
 388
 389     char b[FILENAME_MAX + 1];
 390     char n[FILENAME_MAX + 1];
 391     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 392
 393     snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 394     ret = config_get(id, "cache directory", n);
 395
 396     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 397         int r = mkdir(ret, 0775);
 398         if(r != 0 && errno != EEXIST)
 399             error("Cannot create directory '%s'", ret);
 400     }
 401
 402     return ret;
 403 }
 404
 405 // ----------------------------------------------------------------------------
 406 // core functions
 407
 408 void rrdset_reset(RRDSET *st)
 409 {
 410     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 411
 412     st->last_collected_time.tv_sec = 0;
 413     st->last_collected_time.tv_usec = 0;
 414     st->last_updated.tv_sec = 0;
 415     st->last_updated.tv_usec = 0;
 416     st->current_entry = 0;
 417     st->counter = 0;
 418     st->counter_done = 0;
 419
 420     RRDDIM *rd;
 421     for(rd = st->dimensions; rd ; rd = rd->next) {
 422         rd->last_collected_time.tv_sec = 0;
 423         rd->last_collected_time.tv_usec = 0;
 424         rd->counter = 0;
 425         bzero(rd->values, rd->entries * sizeof(storage_number));
 426     }
 427 }
 428
 429 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)
 430 {
 431     if(!type || !type[0]) {
 432         fatal("Cannot create rrd stats without a type.");
 433         return NULL;
 434     }
 435
 436     if(!id || !id[0]) {
 437         fatal("Cannot create rrd stats without an id.");
 438         return NULL;
 439     }
 440
 441     char fullid[RRD_ID_LENGTH_MAX + 1];
 442     char fullfilename[FILENAME_MAX + 1];
 443     RRDSET *st = NULL;
 444
 445     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 446
 447     st = rrdset_find(fullid);
 448     if(st) {
 449         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 450         return st;
 451     }
 452
 453     long entries = config_get_number(fullid, "history", rrd_default_history_entries);
 454     if(entries < 5) entries = config_set_number(fullid, "history", 5);
 455     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = config_set_number(fullid, "history", RRD_HISTORY_ENTRIES_MAX);
 456
 457     int enabled = config_get_boolean(fullid, "enabled", 1);
 458     if(!enabled) entries = 5;
 459
 460     unsigned long size = sizeof(RRDSET);
 461     char *cache_dir = rrdset_cache_dir(fullid);
 462
 463     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 464
 465     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 466     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);
 467     if(st) {
 468         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 469             errno = 0;
 470             info("Initializing file %s.", fullfilename);
 471             bzero(st, size);
 472         }
 473         else if(strcmp(st->id, fullid) != 0) {
 474             errno = 0;
 475             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 476             // munmap(st, size);
 477             // st = NULL;
 478             bzero(st, size);
 479         }
 480         else if(st->memsize != size || st->entries != entries) {
 481             errno = 0;
 482             error("File %s does not have the desired size. Clearing it.", fullfilename);
 483             bzero(st, size);
 484         }
 485         else if(st->update_every != update_every) {
 486             errno = 0;
 487             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 488             bzero(st, size);
 489         }
 490         else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 491             errno = 0;
 492             error("File %s is too old. Clearing it.", fullfilename);
 493             bzero(st, size);
 494         }
 495     }
 496
 497     if(st) {
 498         st->name = NULL;
 499         st->type = NULL;
 500         st->family = NULL;
 501         st->context = NULL;
 502         st->title = NULL;
 503         st->units = NULL;
 504         st->dimensions = NULL;
 505         st->next = NULL;
 506         st->mapped = rrd_memory_mode;
 507         st->variables = NULL;
 508         st->alarms = NULL;
 509     }
 510     else {
 511         st = callocz(1, size);
 512         st->mapped = RRD_MEMORY_MODE_RAM;
 513     }
 514
 515     st->memsize = size;
 516     st->entries = entries;
 517     st->update_every = update_every;
 518
 519     if(st->current_entry >= st->entries) st->current_entry = 0;
 520
 521     strcpy(st->cache_filename, fullfilename);
 522     strcpy(st->magic, RRDSET_MAGIC);
 523
 524     strcpy(st->id, fullid);
 525     st->hash = simple_hash(st->id);
 526
 527     st->cache_dir = cache_dir;
 528
 529     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 530     st->type       = config_get(st->id, "type", type);
 531     st->family     = config_get(st->id, "family", family?family:st->type);
 532     st->units      = config_get(st->id, "units", units?units:"");
 533
 534     st->context    = config_get(st->id, "context", context?context:st->id);
 535     st->hash_context = simple_hash(st->context);
 536
 537     st->priority = config_get_number(st->id, "priority", priority);
 538     st->enabled = enabled;
 539
 540     st->isdetail = 0;
 541     st->debug = 0;
 542
 543     // if(!strcmp(st->id, "disk_util.dm-0")) {
 544     //     st->debug = 1;
 545     //     error("enabled debugging for '%s'", st->id);
 546     // }
 547     // else error("not enabled debugging for '%s'", st->id);
 548
 549     st->green = NAN;
 550     st->red = NAN;
 551
 552     st->last_collected_time.tv_sec = 0;
 553     st->last_collected_time.tv_usec = 0;
 554     st->counter_done = 0;
 555
 556     st->gap_when_lost_iterations_above = (int) (
 557             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 558
 559     avl_init_lock(&st->dimensions_index, rrddim_compare);
 560     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 561
 562     pthread_rwlock_init(&st->rwlock, NULL);
 563     rrdhost_rwlock(&localhost);
 564
 565     if(name && *name) rrdset_set_name(st, name);
 566     else rrdset_set_name(st, id);
 567
 568     {
 569         char varvalue[CONFIG_MAX_VALUE + 1];
 570         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 571         st->title = config_get(st->id, "title", varvalue);
 572     }
 573
 574     st->rrdfamily = rrdfamily_create(st->family);
 575     st->rrdhost = &localhost;
 576
 577     st->next = localhost.rrdset_root;
 578     localhost.rrdset_root = st;
 579
 580     if(health_enabled) {
 581         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 582         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 583         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 584         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 585         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 586     }
 587
 588     rrdset_index_add(&localhost, st);
 589
 590     rrdsetcalc_link_matching(st);
 591     rrdcalctemplate_link_matching(st);
 592
 593     rrdhost_unlock(&localhost);
 594
 595     return(st);
 596 }
 597
 598 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 599 {
 600     char filename[FILENAME_MAX + 1];
 601     char fullfilename[FILENAME_MAX + 1];
 602
 603     char varname[CONFIG_MAX_NAME + 1];
 604     RRDDIM *rd = NULL;
 605     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 606
 607     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 608
 609     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 610     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 611     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);
 612     if(rd) {
 613         struct timeval now;
 614         gettimeofday(&now, NULL);
 615
 616         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 617             errno = 0;
 618             info("Initializing file %s.", fullfilename);
 619             bzero(rd, size);
 620         }
 621         else if(rd->memsize != size) {
 622             errno = 0;
 623             error("File %s does not have the desired size. Clearing it.", fullfilename);
 624             bzero(rd, size);
 625         }
 626         else if(rd->multiplier != multiplier) {
 627             errno = 0;
 628             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 629             bzero(rd, size);
 630         }
 631         else if(rd->divisor != divisor) {
 632             errno = 0;
 633             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 634             bzero(rd, size);
 635         }
 636         else if(rd->algorithm != algorithm) {
 637             errno = 0;
 638             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 639             bzero(rd, size);
 640         }
 641         else if(rd->update_every != st->update_every) {
 642             errno = 0;
 643             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 644             bzero(rd, size);
 645         }
 646         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 647             errno = 0;
 648             error("File %s is too old. Clearing it.", fullfilename);
 649             bzero(rd, size);
 650         }
 651         else if(strcmp(rd->id, id) != 0) {
 652             errno = 0;
 653             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 654             // munmap(rd, size);
 655             // rd = NULL;
 656             bzero(rd, size);
 657         }
 658     }
 659
 660     if(rd) {
 661         // we have a file mapped for rd
 662         rd->mapped = rrd_memory_mode;
 663         rd->flags = 0x00000000;
 664         rd->variables = NULL;
 665         rd->next = NULL;
 666         rd->name = NULL;
 667     }
 668     else {
 669         // if we didn't manage to get a mmap'd dimension, just create one
 670
 671         rd = callocz(1, size);
 672         rd->mapped = RRD_MEMORY_MODE_RAM;
 673     }
 674     rd->memsize = size;
 675
 676     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 677     strcpy(rd->cache_filename, fullfilename);
 678     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 679     rd->hash = simple_hash(rd->id);
 680
 681     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 682     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 683
 684     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 685     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 686
 687     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 688     rd->multiplier = config_get_number(st->id, varname, multiplier);
 689
 690     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 691     rd->divisor = config_get_number(st->id, varname, divisor);
 692     if(!rd->divisor) rd->divisor = 1;
 693
 694     rd->entries = st->entries;
 695     rd->update_every = st->update_every;
 696
 697     // prevent incremental calculation spikes
 698     rd->counter = 0;
 699     rd->updated = 0;
 700     rd->calculated_value = 0;
 701     rd->last_calculated_value = 0;
 702     rd->collected_value = 0;
 703     rd->last_collected_value = 0;
 704     rd->collected_volume = 0;
 705     rd->stored_volume = 0;
 706     rd->last_stored_value = 0;
 707     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 708     rd->last_collected_time.tv_sec = 0;
 709     rd->last_collected_time.tv_usec = 0;
 710     rd->rrdset = st;
 711
 712     // append this dimension
 713     pthread_rwlock_wrlock(&st->rwlock);
 714     if(!st->dimensions)
 715         st->dimensions = rd;
 716     else {
 717         RRDDIM *td = st->dimensions;
 718         for(; td->next; td = td->next) ;
 719         td->next = rd;
 720     }
 721
 722     if(health_enabled) {
 723         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 724         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 725         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 726     }
 727
 728     pthread_rwlock_unlock(&st->rwlock);
 729
 730     rrddim_index_add(st, rd);
 731
 732     return(rd);
 733 }
 734
 735 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 736 {
 737     debug(D_RRD_CALLS, "rrddim_set_name() %s.%s", st->name, rd->name);
 738
 739     char varname[CONFIG_MAX_NAME + 1];
 740     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 741     config_set_default(st->id, varname, name);
 742
 743     rrddimvar_rename_all(rd);
 744 }
 745
 746 void rrddim_free(RRDSET *st, RRDDIM *rd)
 747 {
 748     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 749
 750     if(rd == st->dimensions)
 751         st->dimensions = rd->next;
 752     else {
 753         RRDDIM *i;
 754         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 755
 756         if (i && i->next == rd)
 757             i->next = rd->next;
 758         else
 759             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 760     }
 761     rd->next = NULL;
 762
 763     while(rd->variables)
 764         rrddimvar_free(rd->variables);
 765
 766     rrddim_index_del(st, rd);
 767
 768     // free(rd->annotations);
 769     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 770         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 771         savememory(rd->cache_filename, rd, rd->memsize);
 772
 773         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 774         munmap(rd, rd->memsize);
 775     }
 776     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 777         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 778         munmap(rd, rd->memsize);
 779     }
 780     else {
 781         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 782         freez(rd);
 783     }
 784 }
 785
 786 void rrdset_free_all(void)
 787 {
 788     info("Freeing all memory...");
 789
 790     rrdhost_rwlock(&localhost);
 791
 792     RRDSET *st;
 793     for(st = localhost.rrdset_root; st ;) {
 794         RRDSET *next = st->next;
 795
 796         pthread_rwlock_wrlock(&st->rwlock);
 797
 798         while(st->variables)
 799             rrdsetvar_free(st->variables);
 800
 801         while(st->alarms)
 802             rrdsetcalc_unlink(st->alarms);
 803
 804         while(st->dimensions)
 805             rrddim_free(st, st->dimensions);
 806
 807         rrdset_index_del(&localhost, st);
 808
 809         st->rrdfamily->use_count--;
 810         if(!st->rrdfamily->use_count)
 811             rrdfamily_free(st->rrdfamily);
 812
 813         pthread_rwlock_unlock(&st->rwlock);
 814
 815         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 816             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 817             savememory(st->cache_filename, st, st->memsize);
 818
 819             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 820             munmap(st, st->memsize);
 821         }
 822         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 823             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 824             munmap(st, st->memsize);
 825         }
 826         else
 827             freez(st);
 828
 829         st = next;
 830     }
 831     localhost.rrdset_root = NULL;
 832
 833     rrdhost_unlock(&localhost);
 834
 835     info("Memory cleanup completed...");
 836 }
 837
 838 void rrdset_save_all(void) {
 839     info("Saving database...");
 840
 841     RRDSET *st;
 842     RRDDIM *rd;
 843
 844     rrdhost_rwlock(&localhost);
 845     for(st = localhost.rrdset_root; st ; st = st->next) {
 846         pthread_rwlock_wrlock(&st->rwlock);
 847
 848         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 849             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 850             savememory(st->cache_filename, st, st->memsize);
 851         }
 852
 853         for(rd = st->dimensions; rd ; rd = rd->next) {
 854             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 855                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 856                 savememory(rd->cache_filename, rd, rd->memsize);
 857             }
 858         }
 859
 860         pthread_rwlock_unlock(&st->rwlock);
 861     }
 862     rrdhost_unlock(&localhost);
 863 }
 864
 865
 866 RRDSET *rrdset_find(const char *id)
 867 {
 868     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 869
 870     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 871     return(st);
 872 }
 873
 874 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 875 {
 876     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 877
 878     char buf[RRD_ID_LENGTH_MAX + 1];
 879
 880     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 881     strcat(buf, ".");
 882     int len = (int) strlen(buf);
 883     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 884
 885     return(rrdset_find(buf));
 886 }
 887
 888 RRDSET *rrdset_find_byname(const char *name)
 889 {
 890     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 891
 892     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 893     return(st);
 894 }
 895
 896 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 897 {
 898     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 899
 900     return rrddim_index_find(st, id, 0);
 901 }
 902
 903 int rrddim_hide(RRDSET *st, const char *id)
 904 {
 905     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 906
 907     RRDDIM *rd = rrddim_find(st, id);
 908     if(unlikely(!rd)) {
 909         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 910         return 1;
 911     }
 912
 913     rd->flags |= RRDDIM_FLAG_HIDDEN;
 914     return 0;
 915 }
 916
 917 int rrddim_unhide(RRDSET *st, const char *id)
 918 {
 919     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 920
 921     RRDDIM *rd = rrddim_find(st, id);
 922     if(unlikely(!rd)) {
 923         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 924         return 1;
 925     }
 926
 927     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 928     return 0;
 929 }
 930
 931 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 932 {
 933     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 934
 935     gettimeofday(&rd->last_collected_time, NULL);
 936     rd->collected_value = value;
 937     rd->updated = 1;
 938     rd->counter++;
 939
 940     return rd->last_collected_value;
 941 }
 942
 943 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 944 {
 945     RRDDIM *rd = rrddim_find(st, id);
 946     if(unlikely(!rd)) {
 947         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 948         return 0;
 949     }
 950
 951     return rrddim_set_by_pointer(st, rd, value);
 952 }
 953
 954 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
 955 {
 956     if(!microseconds) rrdset_next(st);
 957     else {
 958         debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 959
 960         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 961         st->usec_since_last_update = microseconds;
 962     }
 963 }
 964
 965 void rrdset_next(RRDSET *st)
 966 {
 967     unsigned long long microseconds = 0;
 968
 969     if(likely(st->last_collected_time.tv_sec)) {
 970         struct timeval now;
 971         gettimeofday(&now, NULL);
 972         microseconds = usec_dt(&now, &st->last_collected_time);
 973     }
 974     // prevent infinite loop
 975     else microseconds = st->update_every * 1000000ULL;
 976
 977     rrdset_next_usec(st, microseconds);
 978 }
 979
 980 void rrdset_next_plugins(RRDSET *st)
 981 {
 982     rrdset_next(st);
 983 }
 984
 985 unsigned long long rrdset_done(RRDSET *st)
 986 {
 987     if(unlikely(netdata_exit)) return 0;
 988
 989     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 990
 991     RRDDIM *rd;
 992
 993     int
 994         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
 995
 996     char
 997         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
 998         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
 999
1000     unsigned int
1001         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1002
1003     unsigned long long
1004         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1005         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1006         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1007         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1008         update_every_ut = st->update_every * 1000000ULL; // st->update_every in microseconds
1009
1010     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1011         error("Cannot set pthread cancel state to DISABLE.");
1012
1013     // a read lock is OK here
1014     pthread_rwlock_rdlock(&st->rwlock);
1015
1016 /*
1017     // enable the chart, if it was disabled
1018     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1019         st->enabled = 1;
1020 */
1021
1022     // check if the chart has a long time to be updated
1023     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1024         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1025         rrdset_reset(st);
1026         st->usec_since_last_update = update_every_ut;
1027         first_entry = 1;
1028     }
1029     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1030
1031     // set last_collected_time
1032     if(unlikely(!st->last_collected_time.tv_sec)) {
1033         // it is the first entry
1034         // set the last_collected_time to now
1035         gettimeofday(&st->last_collected_time, NULL);
1036         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - update_every_ut;
1037
1038         // the first entry should not be stored
1039         store_this_entry = 0;
1040         first_entry = 1;
1041
1042         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);
1043     }
1044     else {
1045         // it is not the first entry
1046         // calculate the proper last_collected_time, using usec_since_last_update
1047         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1048         unsigned long long ut = last_collect_ut + st->usec_since_last_update;
1049         st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
1050         st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
1051     }
1052
1053     // if this set has not been updated in the past
1054     // we fake the last_update time to be = now - usec_since_last_update
1055     if(unlikely(!st->last_updated.tv_sec)) {
1056         // it has never been updated before
1057         // set a fake last_updated, in the past using usec_since_last_update
1058         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1059         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1060         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1061
1062         // the first entry should not be stored
1063         store_this_entry = 0;
1064         first_entry = 1;
1065
1066         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);
1067     }
1068
1069     // check if we will re-write the entire data set
1070     if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1071         info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Reseting 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);
1072         rrdset_reset(st);
1073
1074         st->usec_since_last_update = update_every_ut;
1075
1076         gettimeofday(&st->last_collected_time, NULL);
1077
1078         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1079         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1080         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1081
1082         // the first entry should not be stored
1083         store_this_entry = 0;
1084         first_entry = 1;
1085     }
1086
1087     // these are the 3 variables that will help us in interpolation
1088     // last_stored_ut = the last time we added a value to the storage
1089     // now_collect_ut = the time the current value has been collected
1090     // next_store_ut  = the time of the next interpolation point
1091     last_stored_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1092     now_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1093     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1094
1095     if(unlikely(st->debug)) {
1096         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1097         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1098         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1099         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1100     }
1101
1102     if(unlikely(!st->counter_done)) {
1103         store_this_entry = 0;
1104         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1105     }
1106     st->counter_done++;
1107
1108     // calculate totals and count the dimensions
1109     int dimensions;
1110     st->collected_total = 0;
1111     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1112         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1113
1114     uint32_t storage_flags = SN_EXISTS;
1115
1116     // process all dimensions to calculate their values
1117     // based on the collected figures only
1118     // at this stage we do not interpolate anything
1119     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1120
1121         if(unlikely(!rd->updated)) {
1122             rd->calculated_value = 0;
1123             continue;
1124         }
1125
1126         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1127             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1128             " collected_value = " COLLECTED_NUMBER_FORMAT
1129             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1130             " calculated_value = " CALCULATED_NUMBER_FORMAT
1131             , st->id, rd->name
1132             , rd->last_collected_value
1133             , rd->collected_value
1134             , rd->last_calculated_value
1135             , rd->calculated_value
1136             );
1137
1138         switch(rd->algorithm) {
1139             case RRDDIM_ABSOLUTE:
1140                 rd->calculated_value = (calculated_number)rd->collected_value
1141                     * (calculated_number)rd->multiplier
1142                     / (calculated_number)rd->divisor;
1143
1144                 if(unlikely(st->debug))
1145                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1146                         CALCULATED_NUMBER_FORMAT " = "
1147                         COLLECTED_NUMBER_FORMAT
1148                         " * " CALCULATED_NUMBER_FORMAT
1149                         " / " CALCULATED_NUMBER_FORMAT
1150                         , st->id, rd->name
1151                         , rd->calculated_value
1152                         , rd->collected_value
1153                         , (calculated_number)rd->multiplier
1154                         , (calculated_number)rd->divisor
1155                         );
1156                 break;
1157
1158             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1159                 if(unlikely(!st->collected_total))
1160                     rd->calculated_value = 0;
1161                 else
1162                     // the percentage of the current value
1163                     // over the total of all dimensions
1164                     rd->calculated_value =
1165                           (calculated_number)100
1166                         * (calculated_number)rd->collected_value
1167                         / (calculated_number)st->collected_total;
1168
1169                 if(unlikely(st->debug))
1170                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1171                         CALCULATED_NUMBER_FORMAT " = 100"
1172                         " * " COLLECTED_NUMBER_FORMAT
1173                         " / " COLLECTED_NUMBER_FORMAT
1174                         , st->id, rd->name
1175                         , rd->calculated_value
1176                         , rd->collected_value
1177                         , st->collected_total
1178                         );
1179                 break;
1180
1181             case RRDDIM_INCREMENTAL:
1182                 if(unlikely(rd->counter <= 1)) {
1183                     rd->calculated_value = 0;
1184                     continue;
1185                 }
1186
1187                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1188                 // to reset the calculation (it will give zero as the calculation for this second)
1189                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1190                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1191                             , st->name, rd->name
1192                             , rd->last_collected_value
1193                             , rd->collected_value);
1194                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1195                     rd->last_collected_value = rd->collected_value;
1196                 }
1197
1198                 rd->calculated_value +=
1199                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1200                     * (calculated_number)rd->multiplier
1201                     / (calculated_number)rd->divisor;
1202
1203                 if(unlikely(st->debug))
1204                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1205                         CALCULATED_NUMBER_FORMAT " = ("
1206                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1207                         ")"
1208                         " * " CALCULATED_NUMBER_FORMAT
1209                         " / " CALCULATED_NUMBER_FORMAT
1210                         , st->id, rd->name
1211                         , rd->calculated_value
1212                         , rd->collected_value, rd->last_collected_value
1213                         , (calculated_number)rd->multiplier
1214                         , (calculated_number)rd->divisor
1215                         );
1216                 break;
1217
1218             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1219                 if(unlikely(rd->counter <= 1)) {
1220                     rd->calculated_value = 0;
1221                     continue;
1222                 }
1223
1224                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1225                 // to reset the calculation (it will give zero as the calculation for this second)
1226                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1227                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1228                     , st->name, rd->name
1229                     , rd->last_collected_value
1230                     , rd->collected_value);
1231                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1232                     rd->last_collected_value = rd->collected_value;
1233                 }
1234
1235                 // the percentage of the current increment
1236                 // over the increment of all dimensions together
1237                 if(unlikely(st->collected_total == st->last_collected_total))
1238                     rd->calculated_value = 0;
1239                 else
1240                     rd->calculated_value =
1241                           (calculated_number)100
1242                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1243                         / (calculated_number)(st->collected_total - st->last_collected_total);
1244
1245                 if(unlikely(st->debug))
1246                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1247                         CALCULATED_NUMBER_FORMAT " = 100"
1248                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1249                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1250                         , st->id, rd->name
1251                         , rd->calculated_value
1252                         , rd->collected_value, rd->last_collected_value
1253                         , st->collected_total, st->last_collected_total
1254                         );
1255                 break;
1256
1257             default:
1258                 // make the default zero, to make sure
1259                 // it gets noticed when we add new types
1260                 rd->calculated_value = 0;
1261
1262                 if(unlikely(st->debug))
1263                     debug(D_RRD_STATS, "%s/%s: CALC "
1264                         CALCULATED_NUMBER_FORMAT " = 0"
1265                         , st->id, rd->name
1266                         , rd->calculated_value
1267                         );
1268                 break;
1269         }
1270
1271         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1272             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1273             " collected_value = " COLLECTED_NUMBER_FORMAT
1274             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1275             " calculated_value = " CALCULATED_NUMBER_FORMAT
1276             , st->id, rd->name
1277             , rd->last_collected_value
1278             , rd->collected_value
1279             , rd->last_calculated_value
1280             , rd->calculated_value
1281             );
1282
1283     }
1284
1285     // at this point we have all the calculated values ready
1286     // it is now time to interpolate values on a second boundary
1287
1288     if(unlikely(now_collect_ut < next_store_ut)) {
1289         // this is collected in the same interpolation point
1290         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1291     }
1292
1293     unsigned long long first_ut = last_stored_ut;
1294     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1295     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1296
1297     for( ; next_store_ut <= now_collect_ut ; next_store_ut += update_every_ut, iterations-- ) {
1298 #ifdef NETDATA_INTERNAL_CHECKS
1299         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); }
1300 #endif
1301
1302         if(unlikely(st->debug)) {
1303             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1304             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1305         }
1306
1307         st->last_updated.tv_sec = (time_t) (next_store_ut / 1000000ULL);
1308         st->last_updated.tv_usec = 0;
1309
1310         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1311             calculated_number new_value;
1312
1313             switch(rd->algorithm) {
1314                 case RRDDIM_INCREMENTAL:
1315                     new_value = (calculated_number)
1316                         (      rd->calculated_value
1317                             * (calculated_number)(next_store_ut - last_collect_ut)
1318                             / (calculated_number)(now_collect_ut - last_collect_ut)
1319                         );
1320
1321                     if(unlikely(st->debug))
1322                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1323                             CALCULATED_NUMBER_FORMAT " = "
1324                             CALCULATED_NUMBER_FORMAT
1325                             " * %llu"
1326                             " / %llu"
1327                             , st->id, rd->name
1328                             , new_value
1329                             , rd->calculated_value
1330                             , (next_store_ut - last_stored_ut)
1331                             , (now_collect_ut - last_stored_ut)
1332                             );
1333
1334                     rd->calculated_value -= new_value;
1335                     new_value += rd->last_calculated_value;
1336                     rd->last_calculated_value = 0;
1337                     new_value /= (calculated_number)st->update_every;
1338
1339                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1340                         if(unlikely(st->debug))
1341                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1342                                 st->id, rd->name
1343                                 , (calculated_number)(next_store_ut - last_stored_ut)
1344                                 );
1345                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1346                     }
1347
1348                     last_collect_ut = next_store_ut;
1349                     break;
1350
1351                 case RRDDIM_ABSOLUTE:
1352                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1353                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1354                 default:
1355                     if(iterations == 1) {
1356                         // this is the last iteration
1357                         // do not interpolate
1358                         // just show the calculated value
1359
1360                         new_value = rd->calculated_value;
1361                     }
1362                     else {
1363                         // we have missed an update
1364                         // interpolate in the middle values
1365
1366                         new_value = (calculated_number)
1367                             (   (     (rd->calculated_value - rd->last_calculated_value)
1368                                     * (calculated_number)(next_store_ut - last_collect_ut)
1369                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1370                                 )
1371                                 +  rd->last_calculated_value
1372                             );
1373
1374                         if(unlikely(st->debug))
1375                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1376                                 CALCULATED_NUMBER_FORMAT " = ((("
1377                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1378                                 " * %llu"
1379                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1380                                 , st->id, rd->name
1381                                 , new_value
1382                                 , rd->calculated_value, rd->last_calculated_value
1383                                 , (next_store_ut - first_ut)
1384                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1385                                 );
1386                     }
1387                     break;
1388             }
1389
1390             if(unlikely(!store_this_entry))
1391                 continue;
1392
1393             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1394                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1395                 rd->last_stored_value = new_value;
1396
1397                 if(unlikely(st->debug))
1398                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1399                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1400                         , st->id, rd->name
1401                         , st->current_entry
1402                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1403                         );
1404             }
1405             else {
1406                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1407                         , st->id, rd->name
1408                         , st->current_entry
1409                         );
1410                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1411                 rd->last_stored_value = NAN;
1412             }
1413
1414             stored_entries++;
1415
1416             if(unlikely(st->debug)) {
1417                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1418                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1419                 calculated_number accuracy = accuracy_loss(t1, t2);
1420                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1421                         , st->id, rd->name
1422                         , st->current_entry
1423                         , t2
1424                         , get_storage_number_flags(rd->values[st->current_entry])
1425                         , t1
1426                         , accuracy
1427                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1428                         );
1429
1430                 rd->collected_volume += t1;
1431                 rd->stored_volume += t2;
1432                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1433                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1434                         , st->id, rd->name
1435                         , st->current_entry
1436                         , rd->stored_volume
1437                         , rd->collected_volume
1438                         , accuracy
1439                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1440                         );
1441
1442             }
1443         }
1444         // reset the storage flags for the next point, if any;
1445         storage_flags = SN_EXISTS;
1446
1447         st->counter++;
1448         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1449         last_stored_ut = next_store_ut;
1450     }
1451
1452     st->last_collected_total  = st->collected_total;
1453
1454     for( rd = st->dimensions; rd ; rd = rd->next ) {
1455         if(unlikely(!rd->updated)) continue;
1456
1457         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);
1458         rd->last_collected_value = rd->collected_value;
1459
1460         switch(rd->algorithm) {
1461             case RRDDIM_INCREMENTAL:
1462                 if(unlikely(!first_entry)) {
1463                     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);
1464                     rd->last_calculated_value += rd->calculated_value;
1465                 }
1466                 else {
1467                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1468                 }
1469                 break;
1470
1471             case RRDDIM_ABSOLUTE:
1472             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1473             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1474                 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);
1475                 rd->last_calculated_value = rd->calculated_value;
1476                 break;
1477         }
1478
1479         rd->calculated_value = 0;
1480         rd->collected_value = 0;
1481         rd->updated = 0;
1482
1483         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1484             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1485             " collected_value = " COLLECTED_NUMBER_FORMAT
1486             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1487             " calculated_value = " CALCULATED_NUMBER_FORMAT
1488             , st->id, rd->name
1489             , rd->last_collected_value
1490             , rd->collected_value
1491             , rd->last_calculated_value
1492             , rd->calculated_value
1493             );
1494     }
1495
1496     // ALL DONE ABOUT THE DATA UPDATE
1497     // --------------------------------------------------------------------
1498
1499 /*
1500     // find if there are any obsolete dimensions (not updated recently)
1501     if(unlikely(rrd_delete_unupdated_dimensions)) {
1502
1503         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1504             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1505                 break;
1506
1507         if(unlikely(rd)) {
1508             RRDDIM *last;
1509             // there is dimension to free
1510             // upgrade our read lock to a write lock
1511             pthread_rwlock_unlock(&st->rwlock);
1512             pthread_rwlock_wrlock(&st->rwlock);
1513
1514             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1515                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1516
1517                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1518                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1519
1520                     if(unlikely(!last)) {
1521                         st->dimensions = rd->next;
1522                         rd->next = NULL;
1523                         rrddim_free(st, rd);
1524                         rd = st->dimensions;
1525                         continue;
1526                     }
1527                     else {
1528                         last->next = rd->next;
1529                         rd->next = NULL;
1530                         rrddim_free(st, rd);
1531                         rd = last->next;
1532                         continue;
1533                     }
1534                 }
1535
1536                 last = rd;
1537                 rd = rd->next;
1538             }
1539
1540             if(unlikely(!st->dimensions)) {
1541                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1542                 st->enabled = 0;
1543             }
1544         }
1545     }
1546 */
1547
1548     pthread_rwlock_unlock(&st->rwlock);
1549
1550     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1551         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1552
1553     return(st->usec_since_last_update);
1554 }