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