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     if(unlikely(st->name && !strcmp(st->name, name)))
 357         return;
 358
 359     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 360
 361     char b[CONFIG_MAX_VALUE + 1];
 362     char n[RRD_ID_LENGTH_MAX + 1];
 363
 364     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 365     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 366
 367     if(st->name) {
 368         rrdset_index_del_name(&localhost, st);
 369         st->name = config_set_default(st->id, "name", b);
 370         st->hash_name = simple_hash(st->name);
 371         rrdsetvar_rename_all(st);
 372     }
 373     else {
 374         st->name = config_get(st->id, "name", b);
 375         st->hash_name = simple_hash(st->name);
 376     }
 377
 378     pthread_rwlock_wrlock(&st->rwlock);
 379     RRDDIM *rd;
 380     for(rd = st->dimensions; rd ;rd = rd->next)
 381         rrddimvar_rename_all(rd);
 382     pthread_rwlock_unlock(&st->rwlock);
 383
 384     rrdset_index_add_name(&localhost, st);
 385 }
 386
 387 // ----------------------------------------------------------------------------
 388 // cache directory
 389
 390 char *rrdset_cache_dir(const char *id)
 391 {
 392     char *ret = NULL;
 393
 394     static char *cache_dir = NULL;
 395     if(!cache_dir) {
 396         cache_dir = config_get("global", "cache directory", CACHE_DIR);
 397         int r = mkdir(cache_dir, 0755);
 398         if(r != 0 && errno != EEXIST)
 399             error("Cannot create directory '%s'", cache_dir);
 400     }
 401
 402     char b[FILENAME_MAX + 1];
 403     char n[FILENAME_MAX + 1];
 404     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 405
 406     snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 407     ret = config_get(id, "cache directory", n);
 408
 409     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 410         int r = mkdir(ret, 0775);
 411         if(r != 0 && errno != EEXIST)
 412             error("Cannot create directory '%s'", ret);
 413     }
 414
 415     return ret;
 416 }
 417
 418 // ----------------------------------------------------------------------------
 419 // core functions
 420
 421 void rrdset_reset(RRDSET *st)
 422 {
 423     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 424
 425     st->last_collected_time.tv_sec = 0;
 426     st->last_collected_time.tv_usec = 0;
 427     st->last_updated.tv_sec = 0;
 428     st->last_updated.tv_usec = 0;
 429     st->current_entry = 0;
 430     st->counter = 0;
 431     st->counter_done = 0;
 432
 433     RRDDIM *rd;
 434     for(rd = st->dimensions; rd ; rd = rd->next) {
 435         rd->last_collected_time.tv_sec = 0;
 436         rd->last_collected_time.tv_usec = 0;
 437         rd->counter = 0;
 438         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 439     }
 440 }
 441 static long align_entries_to_pagesize(long entries) {
 442     if(entries < 5) entries = 5;
 443     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 444
 445 #ifdef NETDATA_LOG_ALLOCATIONS
 446     long page = (size_t)sysconf(_SC_PAGESIZE);
 447
 448     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 449     if(size % page) {
 450         size -= (size % page);
 451         size += page;
 452
 453         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 454         return n;
 455     }
 456
 457     return entries;
 458 #else
 459     return entries;
 460 #endif
 461 }
 462
 463 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)
 464 {
 465     if(!type || !type[0]) {
 466         fatal("Cannot create rrd stats without a type.");
 467         return NULL;
 468     }
 469
 470     if(!id || !id[0]) {
 471         fatal("Cannot create rrd stats without an id.");
 472         return NULL;
 473     }
 474
 475     char fullid[RRD_ID_LENGTH_MAX + 1];
 476     char fullfilename[FILENAME_MAX + 1];
 477     RRDSET *st = NULL;
 478
 479     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 480
 481     st = rrdset_find(fullid);
 482     if(st) {
 483         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 484         return st;
 485     }
 486
 487     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 488     long entries = align_entries_to_pagesize(rentries);
 489     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 490
 491     int enabled = config_get_boolean(fullid, "enabled", 1);
 492     if(!enabled) entries = 5;
 493
 494     unsigned long size = sizeof(RRDSET);
 495     char *cache_dir = rrdset_cache_dir(fullid);
 496
 497     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 498
 499     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 500     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);
 501     if(st) {
 502         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 503             errno = 0;
 504             info("Initializing file %s.", fullfilename);
 505             memset(st, 0, size);
 506         }
 507         else if(strcmp(st->id, fullid) != 0) {
 508             errno = 0;
 509             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 510             // munmap(st, size);
 511             // st = NULL;
 512             memset(st, 0, size);
 513         }
 514         else if(st->memsize != size || st->entries != entries) {
 515             errno = 0;
 516             error("File %s does not have the desired size. Clearing it.", fullfilename);
 517             memset(st, 0, size);
 518         }
 519         else if(st->update_every != update_every) {
 520             errno = 0;
 521             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 522             memset(st, 0, size);
 523         }
 524         else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 525             errno = 0;
 526             error("File %s is too old. Clearing it.", fullfilename);
 527             memset(st, 0, size);
 528         }
 529     }
 530
 531     if(st) {
 532         st->name = NULL;
 533         st->type = NULL;
 534         st->family = NULL;
 535         st->context = NULL;
 536         st->title = NULL;
 537         st->units = NULL;
 538         st->dimensions = NULL;
 539         st->next = NULL;
 540         st->mapped = rrd_memory_mode;
 541         st->variables = NULL;
 542         st->alarms = NULL;
 543     }
 544     else {
 545         st = callocz(1, size);
 546         st->mapped = RRD_MEMORY_MODE_RAM;
 547     }
 548
 549     st->memsize = size;
 550     st->entries = entries;
 551     st->update_every = update_every;
 552
 553     if(st->current_entry >= st->entries) st->current_entry = 0;
 554
 555     strcpy(st->cache_filename, fullfilename);
 556     strcpy(st->magic, RRDSET_MAGIC);
 557
 558     strcpy(st->id, fullid);
 559     st->hash = simple_hash(st->id);
 560
 561     st->cache_dir = cache_dir;
 562
 563     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 564     st->type       = config_get(st->id, "type", type);
 565     st->family     = config_get(st->id, "family", family?family:st->type);
 566     st->units      = config_get(st->id, "units", units?units:"");
 567
 568     st->context    = config_get(st->id, "context", context?context:st->id);
 569     st->hash_context = simple_hash(st->context);
 570
 571     st->priority = config_get_number(st->id, "priority", priority);
 572     st->enabled = enabled;
 573
 574     st->isdetail = 0;
 575     st->debug = 0;
 576
 577     // if(!strcmp(st->id, "disk_util.dm-0")) {
 578     //     st->debug = 1;
 579     //     error("enabled debugging for '%s'", st->id);
 580     // }
 581     // else error("not enabled debugging for '%s'", st->id);
 582
 583     st->green = NAN;
 584     st->red = NAN;
 585
 586     st->last_collected_time.tv_sec = 0;
 587     st->last_collected_time.tv_usec = 0;
 588     st->counter_done = 0;
 589
 590     st->gap_when_lost_iterations_above = (int) (
 591             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 592
 593     avl_init_lock(&st->dimensions_index, rrddim_compare);
 594     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 595
 596     pthread_rwlock_init(&st->rwlock, NULL);
 597     rrdhost_rwlock(&localhost);
 598
 599     if(name && *name) rrdset_set_name(st, name);
 600     else rrdset_set_name(st, id);
 601
 602     {
 603         char varvalue[CONFIG_MAX_VALUE + 1];
 604         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 605         st->title = config_get(st->id, "title", varvalue);
 606     }
 607
 608     st->rrdfamily = rrdfamily_create(st->family);
 609     st->rrdhost = &localhost;
 610
 611     st->next = localhost.rrdset_root;
 612     localhost.rrdset_root = st;
 613
 614     if(health_enabled) {
 615         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 616         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 617         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 618         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 619         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 620     }
 621
 622     rrdset_index_add(&localhost, st);
 623
 624     rrdsetcalc_link_matching(st);
 625     rrdcalctemplate_link_matching(st);
 626
 627     rrdhost_unlock(&localhost);
 628
 629     return(st);
 630 }
 631
 632 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 633 {
 634     char filename[FILENAME_MAX + 1];
 635     char fullfilename[FILENAME_MAX + 1];
 636
 637     char varname[CONFIG_MAX_NAME + 1];
 638     RRDDIM *rd = NULL;
 639     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 640
 641     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 642
 643     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 644     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 645     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);
 646     if(rd) {
 647         struct timeval now;
 648         gettimeofday(&now, NULL);
 649
 650         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 651             errno = 0;
 652             info("Initializing file %s.", fullfilename);
 653             memset(rd, 0, size);
 654         }
 655         else if(rd->memsize != size) {
 656             errno = 0;
 657             error("File %s does not have the desired size. Clearing it.", fullfilename);
 658             memset(rd, 0, size);
 659         }
 660         else if(rd->multiplier != multiplier) {
 661             errno = 0;
 662             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 663             memset(rd, 0, size);
 664         }
 665         else if(rd->divisor != divisor) {
 666             errno = 0;
 667             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 668             memset(rd, 0, size);
 669         }
 670         else if(rd->algorithm != algorithm) {
 671             errno = 0;
 672             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 673             memset(rd, 0, size);
 674         }
 675         else if(rd->update_every != st->update_every) {
 676             errno = 0;
 677             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 678             memset(rd, 0, size);
 679         }
 680         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 681             errno = 0;
 682             error("File %s is too old. Clearing it.", fullfilename);
 683             memset(rd, 0, size);
 684         }
 685         else if(strcmp(rd->id, id) != 0) {
 686             errno = 0;
 687             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 688             // munmap(rd, size);
 689             // rd = NULL;
 690             memset(rd, 0, size);
 691         }
 692     }
 693
 694     if(rd) {
 695         // we have a file mapped for rd
 696         rd->mapped = rrd_memory_mode;
 697         rd->flags = 0x00000000;
 698         rd->variables = NULL;
 699         rd->next = NULL;
 700         rd->name = NULL;
 701     }
 702     else {
 703         // if we didn't manage to get a mmap'd dimension, just create one
 704
 705         rd = callocz(1, size);
 706         rd->mapped = RRD_MEMORY_MODE_RAM;
 707     }
 708     rd->memsize = size;
 709
 710     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 711     strcpy(rd->cache_filename, fullfilename);
 712     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 713     rd->hash = simple_hash(rd->id);
 714
 715     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 716     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 717
 718     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 719     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 720
 721     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 722     rd->multiplier = config_get_number(st->id, varname, multiplier);
 723
 724     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 725     rd->divisor = config_get_number(st->id, varname, divisor);
 726     if(!rd->divisor) rd->divisor = 1;
 727
 728     rd->entries = st->entries;
 729     rd->update_every = st->update_every;
 730
 731     // prevent incremental calculation spikes
 732     rd->counter = 0;
 733     rd->updated = 0;
 734     rd->calculated_value = 0;
 735     rd->last_calculated_value = 0;
 736     rd->collected_value = 0;
 737     rd->last_collected_value = 0;
 738     rd->collected_volume = 0;
 739     rd->stored_volume = 0;
 740     rd->last_stored_value = 0;
 741     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 742     rd->last_collected_time.tv_sec = 0;
 743     rd->last_collected_time.tv_usec = 0;
 744     rd->rrdset = st;
 745
 746     // append this dimension
 747     pthread_rwlock_wrlock(&st->rwlock);
 748     if(!st->dimensions)
 749         st->dimensions = rd;
 750     else {
 751         RRDDIM *td = st->dimensions;
 752         for(; td->next; td = td->next) ;
 753         td->next = rd;
 754     }
 755
 756     if(health_enabled) {
 757         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 758         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 759         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 760     }
 761
 762     pthread_rwlock_unlock(&st->rwlock);
 763
 764     rrddim_index_add(st, rd);
 765
 766     return(rd);
 767 }
 768
 769 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 770 {
 771     if(unlikely(rd->name && !strcmp(rd->name, name)))
 772         return;
 773
 774     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 775
 776     char varname[CONFIG_MAX_NAME + 1];
 777     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 778     rd->name = config_set_default(st->id, varname, name);
 779
 780     rrddimvar_rename_all(rd);
 781 }
 782
 783 void rrddim_free(RRDSET *st, RRDDIM *rd)
 784 {
 785     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 786
 787     if(rd == st->dimensions)
 788         st->dimensions = rd->next;
 789     else {
 790         RRDDIM *i;
 791         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 792
 793         if (i && i->next == rd)
 794             i->next = rd->next;
 795         else
 796             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 797     }
 798     rd->next = NULL;
 799
 800     while(rd->variables)
 801         rrddimvar_free(rd->variables);
 802
 803     rrddim_index_del(st, rd);
 804
 805     // free(rd->annotations);
 806     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 807         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 808         savememory(rd->cache_filename, rd, rd->memsize);
 809
 810         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 811         munmap(rd, rd->memsize);
 812     }
 813     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 814         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 815         munmap(rd, rd->memsize);
 816     }
 817     else {
 818         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 819         freez(rd);
 820     }
 821 }
 822
 823 void rrdset_free_all(void)
 824 {
 825     info("Freeing all memory...");
 826
 827     rrdhost_rwlock(&localhost);
 828
 829     RRDSET *st;
 830     for(st = localhost.rrdset_root; st ;) {
 831         RRDSET *next = st->next;
 832
 833         pthread_rwlock_wrlock(&st->rwlock);
 834
 835         while(st->variables)
 836             rrdsetvar_free(st->variables);
 837
 838         while(st->alarms)
 839             rrdsetcalc_unlink(st->alarms);
 840
 841         while(st->dimensions)
 842             rrddim_free(st, st->dimensions);
 843
 844         rrdset_index_del(&localhost, st);
 845
 846         st->rrdfamily->use_count--;
 847         if(!st->rrdfamily->use_count)
 848             rrdfamily_free(st->rrdfamily);
 849
 850         pthread_rwlock_unlock(&st->rwlock);
 851
 852         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 853             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 854             savememory(st->cache_filename, st, st->memsize);
 855
 856             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 857             munmap(st, st->memsize);
 858         }
 859         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 860             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 861             munmap(st, st->memsize);
 862         }
 863         else
 864             freez(st);
 865
 866         st = next;
 867     }
 868     localhost.rrdset_root = NULL;
 869
 870     rrdhost_unlock(&localhost);
 871
 872     info("Memory cleanup completed...");
 873 }
 874
 875 void rrdset_save_all(void) {
 876     info("Saving database...");
 877
 878     RRDSET *st;
 879     RRDDIM *rd;
 880
 881     rrdhost_rwlock(&localhost);
 882     for(st = localhost.rrdset_root; st ; st = st->next) {
 883         pthread_rwlock_wrlock(&st->rwlock);
 884
 885         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 886             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 887             savememory(st->cache_filename, st, st->memsize);
 888         }
 889
 890         for(rd = st->dimensions; rd ; rd = rd->next) {
 891             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 892                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 893                 savememory(rd->cache_filename, rd, rd->memsize);
 894             }
 895         }
 896
 897         pthread_rwlock_unlock(&st->rwlock);
 898     }
 899     rrdhost_unlock(&localhost);
 900 }
 901
 902
 903 RRDSET *rrdset_find(const char *id)
 904 {
 905     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 906
 907     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 908     return(st);
 909 }
 910
 911 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 912 {
 913     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 914
 915     char buf[RRD_ID_LENGTH_MAX + 1];
 916
 917     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 918     strcat(buf, ".");
 919     int len = (int) strlen(buf);
 920     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 921
 922     return(rrdset_find(buf));
 923 }
 924
 925 RRDSET *rrdset_find_byname(const char *name)
 926 {
 927     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 928
 929     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 930     return(st);
 931 }
 932
 933 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 934 {
 935     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 936
 937     return rrddim_index_find(st, id, 0);
 938 }
 939
 940 int rrddim_hide(RRDSET *st, const char *id)
 941 {
 942     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 943
 944     RRDDIM *rd = rrddim_find(st, id);
 945     if(unlikely(!rd)) {
 946         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 947         return 1;
 948     }
 949
 950     rd->flags |= RRDDIM_FLAG_HIDDEN;
 951     return 0;
 952 }
 953
 954 int rrddim_unhide(RRDSET *st, const char *id)
 955 {
 956     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 957
 958     RRDDIM *rd = rrddim_find(st, id);
 959     if(unlikely(!rd)) {
 960         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 961         return 1;
 962     }
 963
 964     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 965     return 0;
 966 }
 967
 968 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 969 {
 970     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 971
 972     gettimeofday(&rd->last_collected_time, NULL);
 973     rd->collected_value = value;
 974     rd->updated = 1;
 975     rd->counter++;
 976
 977     // 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));
 978
 979     return rd->last_collected_value;
 980 }
 981
 982 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 983 {
 984     RRDDIM *rd = rrddim_find(st, id);
 985     if(unlikely(!rd)) {
 986         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 987         return 0;
 988     }
 989
 990     return rrddim_set_by_pointer(st, rd, value);
 991 }
 992
 993 void rrdset_next_usec_unfiltered(RRDSET *st, unsigned long long microseconds)
 994 {
 995     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
 996         // the first entry
 997         microseconds = st->update_every * 1000000ULL;
 998     }
 999     st->usec_since_last_update = microseconds;
1000 }
1001
1002 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
1003 {
1004     struct timeval now;
1005     gettimeofday(&now, NULL);
1006
1007     if(unlikely(!st->last_collected_time.tv_sec)) {
1008         // the first entry
1009         microseconds = st->update_every * 1000000ULL;
1010     }
1011     else if(unlikely(!microseconds)) {
1012         // no dt given by the plugin
1013         microseconds = usec_dt(&now, &st->last_collected_time);
1014     }
1015     else {
1016         // microseconds has the time since the last collection
1017         unsigned long long now_usec = timeval_usec(&now);
1018         unsigned long long last_usec = timeval_usec(&st->last_collected_time);
1019         unsigned long long since_last_usec = usec_dt(&now, &st->last_collected_time);
1020
1021         // verify the microseconds given is good
1022         if(unlikely(microseconds > since_last_usec)) {
1023             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);
1024
1025 #ifdef NETDATA_INTERNAL_CHECKS
1026             if(unlikely(last_usec + microseconds > now_usec + 1000))
1027                 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);
1028 #endif
1029
1030             microseconds = since_last_usec;
1031         }
1032         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1033             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);
1034
1035 #ifdef NETDATA_INTERNAL_CHECKS
1036             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);
1037 #endif
1038             microseconds = since_last_usec;
1039         }
1040     }
1041     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1042
1043     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1044     st->usec_since_last_update = microseconds;
1045 }
1046
1047 unsigned long long rrdset_done(RRDSET *st)
1048 {
1049     if(unlikely(netdata_exit)) return 0;
1050
1051     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1052
1053     RRDDIM *rd;
1054
1055     int
1056         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1057
1058     char
1059         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1060         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1061
1062     unsigned int
1063         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1064
1065     unsigned long long
1066         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1067         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1068         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1069         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1070         update_every_ut = st->update_every * 1000000ULL; // st->update_every in microseconds
1071
1072     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1073         error("Cannot set pthread cancel state to DISABLE.");
1074
1075     // a read lock is OK here
1076     pthread_rwlock_rdlock(&st->rwlock);
1077
1078 /*
1079     // enable the chart, if it was disabled
1080     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1081         st->enabled = 1;
1082 */
1083
1084     // check if the chart has a long time to be updated
1085     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1086         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1087         rrdset_reset(st);
1088         st->usec_since_last_update = update_every_ut;
1089         first_entry = 1;
1090     }
1091     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1092
1093     // set last_collected_time
1094     if(unlikely(!st->last_collected_time.tv_sec)) {
1095         // it is the first entry
1096         // set the last_collected_time to now
1097         gettimeofday(&st->last_collected_time, NULL);
1098         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - update_every_ut;
1099
1100         // the first entry should not be stored
1101         store_this_entry = 0;
1102         first_entry = 1;
1103
1104         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);
1105     }
1106     else {
1107         // it is not the first entry
1108         // calculate the proper last_collected_time, using usec_since_last_update
1109         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1110         unsigned long long ut = last_collect_ut + st->usec_since_last_update;
1111         st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
1112         st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
1113     }
1114
1115     // if this set has not been updated in the past
1116     // we fake the last_update time to be = now - usec_since_last_update
1117     if(unlikely(!st->last_updated.tv_sec)) {
1118         // it has never been updated before
1119         // set a fake last_updated, in the past using usec_since_last_update
1120         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1121         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1122         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1123
1124         // the first entry should not be stored
1125         store_this_entry = 0;
1126         first_entry = 1;
1127
1128         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);
1129     }
1130
1131     // check if we will re-write the entire data set
1132     if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1133         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);
1134         rrdset_reset(st);
1135
1136         st->usec_since_last_update = update_every_ut;
1137
1138         gettimeofday(&st->last_collected_time, NULL);
1139
1140         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1141         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1142         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1143
1144         // the first entry should not be stored
1145         store_this_entry = 0;
1146         first_entry = 1;
1147     }
1148
1149     // these are the 3 variables that will help us in interpolation
1150     // last_stored_ut = the last time we added a value to the storage
1151     // now_collect_ut = the time the current value has been collected
1152     // next_store_ut  = the time of the next interpolation point
1153     last_stored_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1154     now_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1155     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1156
1157     if(unlikely(st->debug)) {
1158         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1159         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1160         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1161         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1162     }
1163
1164     if(unlikely(!st->counter_done)) {
1165         store_this_entry = 0;
1166         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1167     }
1168     st->counter_done++;
1169
1170     // calculate totals and count the dimensions
1171     int dimensions;
1172     st->collected_total = 0;
1173     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1174         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1175
1176     uint32_t storage_flags = SN_EXISTS;
1177
1178     // process all dimensions to calculate their values
1179     // based on the collected figures only
1180     // at this stage we do not interpolate anything
1181     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1182
1183         if(unlikely(!rd->updated)) {
1184             rd->calculated_value = 0;
1185             continue;
1186         }
1187
1188         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1189             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1190             " collected_value = " COLLECTED_NUMBER_FORMAT
1191             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1192             " calculated_value = " CALCULATED_NUMBER_FORMAT
1193             , st->id, rd->name
1194             , rd->last_collected_value
1195             , rd->collected_value
1196             , rd->last_calculated_value
1197             , rd->calculated_value
1198             );
1199
1200         switch(rd->algorithm) {
1201             case RRDDIM_ABSOLUTE:
1202                 rd->calculated_value = (calculated_number)rd->collected_value
1203                     * (calculated_number)rd->multiplier
1204                     / (calculated_number)rd->divisor;
1205
1206                 if(unlikely(st->debug))
1207                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1208                         CALCULATED_NUMBER_FORMAT " = "
1209                         COLLECTED_NUMBER_FORMAT
1210                         " * " CALCULATED_NUMBER_FORMAT
1211                         " / " CALCULATED_NUMBER_FORMAT
1212                         , st->id, rd->name
1213                         , rd->calculated_value
1214                         , rd->collected_value
1215                         , (calculated_number)rd->multiplier
1216                         , (calculated_number)rd->divisor
1217                         );
1218                 break;
1219
1220             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1221                 if(unlikely(!st->collected_total))
1222                     rd->calculated_value = 0;
1223                 else
1224                     // the percentage of the current value
1225                     // over the total of all dimensions
1226                     rd->calculated_value =
1227                           (calculated_number)100
1228                         * (calculated_number)rd->collected_value
1229                         / (calculated_number)st->collected_total;
1230
1231                 if(unlikely(st->debug))
1232                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1233                         CALCULATED_NUMBER_FORMAT " = 100"
1234                         " * " COLLECTED_NUMBER_FORMAT
1235                         " / " COLLECTED_NUMBER_FORMAT
1236                         , st->id, rd->name
1237                         , rd->calculated_value
1238                         , rd->collected_value
1239                         , st->collected_total
1240                         );
1241                 break;
1242
1243             case RRDDIM_INCREMENTAL:
1244                 if(unlikely(rd->counter <= 1)) {
1245                     rd->calculated_value = 0;
1246                     continue;
1247                 }
1248
1249                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1250                 // to reset the calculation (it will give zero as the calculation for this second)
1251                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1252                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1253                             , st->name, rd->name
1254                             , rd->last_collected_value
1255                             , rd->collected_value);
1256                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1257                     rd->last_collected_value = rd->collected_value;
1258                 }
1259
1260                 rd->calculated_value +=
1261                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1262                     * (calculated_number)rd->multiplier
1263                     / (calculated_number)rd->divisor;
1264
1265                 if(unlikely(st->debug))
1266                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1267                         CALCULATED_NUMBER_FORMAT " = ("
1268                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1269                         ")"
1270                         " * " CALCULATED_NUMBER_FORMAT
1271                         " / " CALCULATED_NUMBER_FORMAT
1272                         , st->id, rd->name
1273                         , rd->calculated_value
1274                         , rd->collected_value, rd->last_collected_value
1275                         , (calculated_number)rd->multiplier
1276                         , (calculated_number)rd->divisor
1277                         );
1278                 break;
1279
1280             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1281                 if(unlikely(rd->counter <= 1)) {
1282                     rd->calculated_value = 0;
1283                     continue;
1284                 }
1285
1286                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1287                 // to reset the calculation (it will give zero as the calculation for this second)
1288                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1289                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1290                     , st->name, rd->name
1291                     , rd->last_collected_value
1292                     , rd->collected_value);
1293                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1294                     rd->last_collected_value = rd->collected_value;
1295                 }
1296
1297                 // the percentage of the current increment
1298                 // over the increment of all dimensions together
1299                 if(unlikely(st->collected_total == st->last_collected_total))
1300                     rd->calculated_value = 0;
1301                 else
1302                     rd->calculated_value =
1303                           (calculated_number)100
1304                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1305                         / (calculated_number)(st->collected_total - st->last_collected_total);
1306
1307                 if(unlikely(st->debug))
1308                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1309                         CALCULATED_NUMBER_FORMAT " = 100"
1310                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1311                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1312                         , st->id, rd->name
1313                         , rd->calculated_value
1314                         , rd->collected_value, rd->last_collected_value
1315                         , st->collected_total, st->last_collected_total
1316                         );
1317                 break;
1318
1319             default:
1320                 // make the default zero, to make sure
1321                 // it gets noticed when we add new types
1322                 rd->calculated_value = 0;
1323
1324                 if(unlikely(st->debug))
1325                     debug(D_RRD_STATS, "%s/%s: CALC "
1326                         CALCULATED_NUMBER_FORMAT " = 0"
1327                         , st->id, rd->name
1328                         , rd->calculated_value
1329                         );
1330                 break;
1331         }
1332
1333         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1334             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1335             " collected_value = " COLLECTED_NUMBER_FORMAT
1336             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1337             " calculated_value = " CALCULATED_NUMBER_FORMAT
1338             , st->id, rd->name
1339             , rd->last_collected_value
1340             , rd->collected_value
1341             , rd->last_calculated_value
1342             , rd->calculated_value
1343             );
1344
1345     }
1346
1347     // at this point we have all the calculated values ready
1348     // it is now time to interpolate values on a second boundary
1349
1350     if(unlikely(now_collect_ut < next_store_ut)) {
1351         // this is collected in the same interpolation point
1352         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1353     }
1354
1355     unsigned long long first_ut = last_stored_ut;
1356     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1357     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1358
1359     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1360 #ifdef NETDATA_INTERNAL_CHECKS
1361         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); }
1362 #endif
1363
1364         if(unlikely(st->debug)) {
1365             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1366             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1367         }
1368
1369         st->last_updated.tv_sec = (time_t) (next_store_ut / 1000000ULL);
1370         st->last_updated.tv_usec = 0;
1371
1372         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1373             calculated_number new_value;
1374
1375             switch(rd->algorithm) {
1376                 case RRDDIM_INCREMENTAL:
1377                     new_value = (calculated_number)
1378                         (      rd->calculated_value
1379                             * (calculated_number)(next_store_ut - last_collect_ut)
1380                             / (calculated_number)(now_collect_ut - last_collect_ut)
1381                         );
1382
1383                     if(unlikely(st->debug))
1384                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1385                             CALCULATED_NUMBER_FORMAT " = "
1386                             CALCULATED_NUMBER_FORMAT
1387                             " * %llu"
1388                             " / %llu"
1389                             , st->id, rd->name
1390                             , new_value
1391                             , rd->calculated_value
1392                             , (next_store_ut - last_stored_ut)
1393                             , (now_collect_ut - last_stored_ut)
1394                             );
1395
1396                     rd->calculated_value -= new_value;
1397                     new_value += rd->last_calculated_value;
1398                     rd->last_calculated_value = 0;
1399                     new_value /= (calculated_number)st->update_every;
1400
1401                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1402                         if(unlikely(st->debug))
1403                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1404                                 st->id, rd->name
1405                                 , (calculated_number)(next_store_ut - last_stored_ut)
1406                                 );
1407                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1408                     }
1409                     break;
1410
1411                 case RRDDIM_ABSOLUTE:
1412                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1413                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1414                 default:
1415                     if(iterations == 1) {
1416                         // this is the last iteration
1417                         // do not interpolate
1418                         // just show the calculated value
1419
1420                         new_value = rd->calculated_value;
1421                     }
1422                     else {
1423                         // we have missed an update
1424                         // interpolate in the middle values
1425
1426                         new_value = (calculated_number)
1427                             (   (     (rd->calculated_value - rd->last_calculated_value)
1428                                     * (calculated_number)(next_store_ut - last_collect_ut)
1429                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1430                                 )
1431                                 +  rd->last_calculated_value
1432                             );
1433
1434                         if(unlikely(st->debug))
1435                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1436                                 CALCULATED_NUMBER_FORMAT " = ((("
1437                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1438                                 " * %llu"
1439                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1440                                 , st->id, rd->name
1441                                 , new_value
1442                                 , rd->calculated_value, rd->last_calculated_value
1443                                 , (next_store_ut - first_ut)
1444                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1445                                 );
1446                     }
1447                     break;
1448             }
1449
1450             if(unlikely(!store_this_entry)) {
1451                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1452                 continue;
1453             }
1454
1455             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1456                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1457                 rd->last_stored_value = new_value;
1458
1459                 if(unlikely(st->debug))
1460                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1461                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1462                         , st->id, rd->name
1463                         , st->current_entry
1464                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1465                         );
1466             }
1467             else {
1468                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1469                         , st->id, rd->name
1470                         , st->current_entry
1471                         );
1472                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1473                 rd->last_stored_value = NAN;
1474             }
1475
1476             stored_entries++;
1477
1478             if(unlikely(st->debug)) {
1479                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1480                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1481                 calculated_number accuracy = accuracy_loss(t1, t2);
1482                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1483                         , st->id, rd->name
1484                         , st->current_entry
1485                         , t2
1486                         , get_storage_number_flags(rd->values[st->current_entry])
1487                         , t1
1488                         , accuracy
1489                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1490                         );
1491
1492                 rd->collected_volume += t1;
1493                 rd->stored_volume += t2;
1494                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1495                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1496                         , st->id, rd->name
1497                         , st->current_entry
1498                         , rd->stored_volume
1499                         , rd->collected_volume
1500                         , accuracy
1501                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1502                         );
1503
1504             }
1505         }
1506         // reset the storage flags for the next point, if any;
1507         storage_flags = SN_EXISTS;
1508
1509         st->counter++;
1510         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1511         last_stored_ut = next_store_ut;
1512     }
1513
1514     st->last_collected_total  = st->collected_total;
1515
1516     for( rd = st->dimensions; rd ; rd = rd->next ) {
1517         if(unlikely(!rd->updated)) continue;
1518
1519         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);
1520         rd->last_collected_value = rd->collected_value;
1521
1522         switch(rd->algorithm) {
1523             case RRDDIM_INCREMENTAL:
1524                 if(unlikely(!first_entry)) {
1525                     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);
1526                     rd->last_calculated_value += rd->calculated_value;
1527                 }
1528                 else {
1529                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1530                 }
1531                 break;
1532
1533             case RRDDIM_ABSOLUTE:
1534             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1535             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1536                 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);
1537                 rd->last_calculated_value = rd->calculated_value;
1538                 break;
1539         }
1540
1541         rd->calculated_value = 0;
1542         rd->collected_value = 0;
1543         rd->updated = 0;
1544
1545         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1546             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1547             " collected_value = " COLLECTED_NUMBER_FORMAT
1548             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1549             " calculated_value = " CALCULATED_NUMBER_FORMAT
1550             , st->id, rd->name
1551             , rd->last_collected_value
1552             , rd->collected_value
1553             , rd->last_calculated_value
1554             , rd->calculated_value
1555             );
1556     }
1557
1558     // ALL DONE ABOUT THE DATA UPDATE
1559     // --------------------------------------------------------------------
1560
1561 /*
1562     // find if there are any obsolete dimensions (not updated recently)
1563     if(unlikely(rrd_delete_unupdated_dimensions)) {
1564
1565         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1566             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1567                 break;
1568
1569         if(unlikely(rd)) {
1570             RRDDIM *last;
1571             // there is dimension to free
1572             // upgrade our read lock to a write lock
1573             pthread_rwlock_unlock(&st->rwlock);
1574             pthread_rwlock_wrlock(&st->rwlock);
1575
1576             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1577                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1578
1579                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1580                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1581
1582                     if(unlikely(!last)) {
1583                         st->dimensions = rd->next;
1584                         rd->next = NULL;
1585                         rrddim_free(st, rd);
1586                         rd = st->dimensions;
1587                         continue;
1588                     }
1589                     else {
1590                         last->next = rd->next;
1591                         rd->next = NULL;
1592                         rrddim_free(st, rd);
1593                         rd = last->next;
1594                         continue;
1595                     }
1596                 }
1597
1598                 last = rd;
1599                 rd = rd->next;
1600             }
1601
1602             if(unlikely(!st->dimensions)) {
1603                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1604                 st->enabled = 0;
1605             }
1606         }
1607     }
1608 */
1609
1610     pthread_rwlock_unlock(&st->rwlock);
1611
1612     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1613         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1614
1615     return(st->usec_since_last_update);
1616 }