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
 478     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 479
 480     RRDSET *st = rrdset_find(fullid);
 481     if(st) {
 482         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 483         return st;
 484     }
 485
 486     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 487     long entries = align_entries_to_pagesize(rentries);
 488     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 489
 490     int enabled = config_get_boolean(fullid, "enabled", 1);
 491     if(!enabled) entries = 5;
 492
 493     unsigned long size = sizeof(RRDSET);
 494     char *cache_dir = rrdset_cache_dir(fullid);
 495
 496     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 497
 498     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 499     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);
 500     if(st) {
 501         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 502             errno = 0;
 503             info("Initializing file %s.", fullfilename);
 504             memset(st, 0, size);
 505         }
 506         else if(strcmp(st->id, fullid) != 0) {
 507             errno = 0;
 508             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 509             // munmap(st, size);
 510             // st = NULL;
 511             memset(st, 0, size);
 512         }
 513         else if(st->memsize != size || st->entries != entries) {
 514             errno = 0;
 515             error("File %s does not have the desired size. Clearing it.", fullfilename);
 516             memset(st, 0, size);
 517         }
 518         else if(st->update_every != update_every) {
 519             errno = 0;
 520             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 521             memset(st, 0, size);
 522         }
 523         else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 524             errno = 0;
 525             error("File %s is too old. Clearing it.", fullfilename);
 526             memset(st, 0, size);
 527         }
 528
 529         // make sure the database is aligned
 530         if(st->last_updated.tv_sec % update_every) {
 531             st->last_updated.tv_sec -= st->last_updated.tv_sec % update_every;
 532             st->last_updated.tv_usec = 0;
 533         }
 534     }
 535
 536     if(st) {
 537         st->name = NULL;
 538         st->type = NULL;
 539         st->family = NULL;
 540         st->context = NULL;
 541         st->title = NULL;
 542         st->units = NULL;
 543         st->dimensions = NULL;
 544         st->next = NULL;
 545         st->mapped = rrd_memory_mode;
 546         st->variables = NULL;
 547         st->alarms = NULL;
 548     }
 549     else {
 550         st = callocz(1, size);
 551         st->mapped = RRD_MEMORY_MODE_RAM;
 552     }
 553
 554     st->memsize = size;
 555     st->entries = entries;
 556     st->update_every = update_every;
 557
 558     if(st->current_entry >= st->entries) st->current_entry = 0;
 559
 560     strcpy(st->cache_filename, fullfilename);
 561     strcpy(st->magic, RRDSET_MAGIC);
 562
 563     strcpy(st->id, fullid);
 564     st->hash = simple_hash(st->id);
 565
 566     st->cache_dir = cache_dir;
 567
 568     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 569     st->type       = config_get(st->id, "type", type);
 570     st->family     = config_get(st->id, "family", family?family:st->type);
 571     st->units      = config_get(st->id, "units", units?units:"");
 572
 573     st->context    = config_get(st->id, "context", context?context:st->id);
 574     st->hash_context = simple_hash(st->context);
 575
 576     st->priority = config_get_number(st->id, "priority", priority);
 577     st->enabled = enabled;
 578
 579     st->isdetail = 0;
 580     st->debug = 0;
 581
 582     // if(!strcmp(st->id, "disk_util.dm-0")) {
 583     //     st->debug = 1;
 584     //     error("enabled debugging for '%s'", st->id);
 585     // }
 586     // else error("not enabled debugging for '%s'", st->id);
 587
 588     st->green = NAN;
 589     st->red = NAN;
 590
 591     st->last_collected_time.tv_sec = 0;
 592     st->last_collected_time.tv_usec = 0;
 593     st->counter_done = 0;
 594
 595     st->gap_when_lost_iterations_above = (int) (
 596             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 597
 598     avl_init_lock(&st->dimensions_index, rrddim_compare);
 599     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 600
 601     pthread_rwlock_init(&st->rwlock, NULL);
 602     rrdhost_rwlock(&localhost);
 603
 604     if(name && *name) rrdset_set_name(st, name);
 605     else rrdset_set_name(st, id);
 606
 607     {
 608         char varvalue[CONFIG_MAX_VALUE + 1];
 609         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 610         st->title = config_get(st->id, "title", varvalue);
 611     }
 612
 613     st->rrdfamily = rrdfamily_create(st->family);
 614     st->rrdhost = &localhost;
 615
 616     st->next = localhost.rrdset_root;
 617     localhost.rrdset_root = st;
 618
 619     if(health_enabled) {
 620         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 621         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 622         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 623         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 624         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 625     }
 626
 627     rrdset_index_add(&localhost, st);
 628
 629     rrdsetcalc_link_matching(st);
 630     rrdcalctemplate_link_matching(st);
 631
 632     rrdhost_unlock(&localhost);
 633
 634     return(st);
 635 }
 636
 637 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 638 {
 639     char filename[FILENAME_MAX + 1];
 640     char fullfilename[FILENAME_MAX + 1];
 641
 642     char varname[CONFIG_MAX_NAME + 1];
 643     RRDDIM *rd = NULL;
 644     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 645
 646     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 647
 648     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 649     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 650     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);
 651     if(rd) {
 652         struct timeval now;
 653         gettimeofday(&now, NULL);
 654
 655         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 656             errno = 0;
 657             info("Initializing file %s.", fullfilename);
 658             memset(rd, 0, size);
 659         }
 660         else if(rd->memsize != size) {
 661             errno = 0;
 662             error("File %s does not have the desired size. Clearing it.", fullfilename);
 663             memset(rd, 0, size);
 664         }
 665         else if(rd->multiplier != multiplier) {
 666             errno = 0;
 667             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 668             memset(rd, 0, size);
 669         }
 670         else if(rd->divisor != divisor) {
 671             errno = 0;
 672             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 673             memset(rd, 0, size);
 674         }
 675         else if(rd->algorithm != algorithm) {
 676             errno = 0;
 677             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 678             memset(rd, 0, size);
 679         }
 680         else if(rd->update_every != st->update_every) {
 681             errno = 0;
 682             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 683             memset(rd, 0, size);
 684         }
 685         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 686             errno = 0;
 687             error("File %s is too old. Clearing it.", fullfilename);
 688             memset(rd, 0, size);
 689         }
 690         else if(strcmp(rd->id, id) != 0) {
 691             errno = 0;
 692             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 693             // munmap(rd, size);
 694             // rd = NULL;
 695             memset(rd, 0, size);
 696         }
 697     }
 698
 699     if(rd) {
 700         // we have a file mapped for rd
 701         rd->mapped = rrd_memory_mode;
 702         rd->flags = 0x00000000;
 703         rd->variables = NULL;
 704         rd->next = NULL;
 705         rd->name = NULL;
 706     }
 707     else {
 708         // if we didn't manage to get a mmap'd dimension, just create one
 709
 710         rd = callocz(1, size);
 711         rd->mapped = RRD_MEMORY_MODE_RAM;
 712     }
 713     rd->memsize = size;
 714
 715     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 716     strcpy(rd->cache_filename, fullfilename);
 717     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 718     rd->hash = simple_hash(rd->id);
 719
 720     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 721     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 722
 723     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 724     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 725
 726     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 727     rd->multiplier = config_get_number(st->id, varname, multiplier);
 728
 729     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 730     rd->divisor = config_get_number(st->id, varname, divisor);
 731     if(!rd->divisor) rd->divisor = 1;
 732
 733     rd->entries = st->entries;
 734     rd->update_every = st->update_every;
 735
 736     // prevent incremental calculation spikes
 737     rd->counter = 0;
 738     rd->updated = 0;
 739     rd->calculated_value = 0;
 740     rd->last_calculated_value = 0;
 741     rd->collected_value = 0;
 742     rd->last_collected_value = 0;
 743     rd->collected_volume = 0;
 744     rd->stored_volume = 0;
 745     rd->last_stored_value = 0;
 746     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 747     rd->last_collected_time.tv_sec = 0;
 748     rd->last_collected_time.tv_usec = 0;
 749     rd->rrdset = st;
 750
 751     // append this dimension
 752     pthread_rwlock_wrlock(&st->rwlock);
 753     if(!st->dimensions)
 754         st->dimensions = rd;
 755     else {
 756         RRDDIM *td = st->dimensions;
 757         for(; td->next; td = td->next) ;
 758         td->next = rd;
 759     }
 760
 761     if(health_enabled) {
 762         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 763         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 764         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 765     }
 766
 767     pthread_rwlock_unlock(&st->rwlock);
 768
 769     rrddim_index_add(st, rd);
 770
 771     return(rd);
 772 }
 773
 774 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 775 {
 776     if(unlikely(rd->name && !strcmp(rd->name, name)))
 777         return;
 778
 779     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 780
 781     char varname[CONFIG_MAX_NAME + 1];
 782     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 783     rd->name = config_set_default(st->id, varname, name);
 784
 785     rrddimvar_rename_all(rd);
 786 }
 787
 788 void rrddim_free(RRDSET *st, RRDDIM *rd)
 789 {
 790     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 791
 792     if(rd == st->dimensions)
 793         st->dimensions = rd->next;
 794     else {
 795         RRDDIM *i;
 796         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 797
 798         if (i && i->next == rd)
 799             i->next = rd->next;
 800         else
 801             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 802     }
 803     rd->next = NULL;
 804
 805     while(rd->variables)
 806         rrddimvar_free(rd->variables);
 807
 808     rrddim_index_del(st, rd);
 809
 810     // free(rd->annotations);
 811     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 812         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 813         savememory(rd->cache_filename, rd, rd->memsize);
 814
 815         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 816         munmap(rd, rd->memsize);
 817     }
 818     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 819         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 820         munmap(rd, rd->memsize);
 821     }
 822     else {
 823         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 824         freez(rd);
 825     }
 826 }
 827
 828 void rrdset_free_all(void)
 829 {
 830     info("Freeing all memory...");
 831
 832     rrdhost_rwlock(&localhost);
 833
 834     RRDSET *st;
 835     for(st = localhost.rrdset_root; st ;) {
 836         RRDSET *next = st->next;
 837
 838         pthread_rwlock_wrlock(&st->rwlock);
 839
 840         while(st->variables)
 841             rrdsetvar_free(st->variables);
 842
 843         while(st->alarms)
 844             rrdsetcalc_unlink(st->alarms);
 845
 846         while(st->dimensions)
 847             rrddim_free(st, st->dimensions);
 848
 849         rrdset_index_del(&localhost, st);
 850
 851         st->rrdfamily->use_count--;
 852         if(!st->rrdfamily->use_count)
 853             rrdfamily_free(st->rrdfamily);
 854
 855         pthread_rwlock_unlock(&st->rwlock);
 856
 857         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 858             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 859             savememory(st->cache_filename, st, st->memsize);
 860
 861             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 862             munmap(st, st->memsize);
 863         }
 864         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 865             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 866             munmap(st, st->memsize);
 867         }
 868         else
 869             freez(st);
 870
 871         st = next;
 872     }
 873     localhost.rrdset_root = NULL;
 874
 875     rrdhost_unlock(&localhost);
 876
 877     info("Memory cleanup completed...");
 878 }
 879
 880 void rrdset_save_all(void) {
 881     info("Saving database...");
 882
 883     RRDSET *st;
 884     RRDDIM *rd;
 885
 886     rrdhost_rwlock(&localhost);
 887     for(st = localhost.rrdset_root; st ; st = st->next) {
 888         pthread_rwlock_wrlock(&st->rwlock);
 889
 890         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 891             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 892             savememory(st->cache_filename, st, st->memsize);
 893         }
 894
 895         for(rd = st->dimensions; rd ; rd = rd->next) {
 896             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 897                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 898                 savememory(rd->cache_filename, rd, rd->memsize);
 899             }
 900         }
 901
 902         pthread_rwlock_unlock(&st->rwlock);
 903     }
 904     rrdhost_unlock(&localhost);
 905 }
 906
 907
 908 RRDSET *rrdset_find(const char *id)
 909 {
 910     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 911
 912     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 913     return(st);
 914 }
 915
 916 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 917 {
 918     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 919
 920     char buf[RRD_ID_LENGTH_MAX + 1];
 921
 922     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 923     strcat(buf, ".");
 924     int len = (int) strlen(buf);
 925     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 926
 927     return(rrdset_find(buf));
 928 }
 929
 930 RRDSET *rrdset_find_byname(const char *name)
 931 {
 932     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 933
 934     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 935     return(st);
 936 }
 937
 938 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 939 {
 940     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 941
 942     return rrddim_index_find(st, id, 0);
 943 }
 944
 945 int rrddim_hide(RRDSET *st, const char *id)
 946 {
 947     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 948
 949     RRDDIM *rd = rrddim_find(st, id);
 950     if(unlikely(!rd)) {
 951         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 952         return 1;
 953     }
 954
 955     rd->flags |= RRDDIM_FLAG_HIDDEN;
 956     return 0;
 957 }
 958
 959 int rrddim_unhide(RRDSET *st, const char *id)
 960 {
 961     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 962
 963     RRDDIM *rd = rrddim_find(st, id);
 964     if(unlikely(!rd)) {
 965         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 966         return 1;
 967     }
 968
 969     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 970     return 0;
 971 }
 972
 973 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 974 {
 975     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 976
 977     gettimeofday(&rd->last_collected_time, NULL);
 978     rd->collected_value = value;
 979     rd->updated = 1;
 980     rd->counter++;
 981
 982     // 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));
 983
 984     return rd->last_collected_value;
 985 }
 986
 987 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 988 {
 989     RRDDIM *rd = rrddim_find(st, id);
 990     if(unlikely(!rd)) {
 991         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 992         return 0;
 993     }
 994
 995     return rrddim_set_by_pointer(st, rd, value);
 996 }
 997
 998 void rrdset_next_usec_unfiltered(RRDSET *st, unsigned long long microseconds)
 999 {
1000     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
1001         // the first entry
1002         microseconds = st->update_every * 1000000ULL;
1003     }
1004     st->usec_since_last_update = microseconds;
1005 }
1006
1007 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
1008 {
1009     struct timeval now;
1010     gettimeofday(&now, NULL);
1011
1012     if(unlikely(!st->last_collected_time.tv_sec)) {
1013         // the first entry
1014         microseconds = st->update_every * 1000000ULL;
1015     }
1016     else if(unlikely(!microseconds)) {
1017         // no dt given by the plugin
1018         microseconds = usec_dt(&now, &st->last_collected_time);
1019     }
1020     else {
1021         // microseconds has the time since the last collection
1022         unsigned long long now_usec = timeval_usec(&now);
1023         unsigned long long last_usec = timeval_usec(&st->last_collected_time);
1024         unsigned long long since_last_usec = usec_dt(&now, &st->last_collected_time);
1025
1026         // verify the microseconds given is good
1027         if(unlikely(microseconds > since_last_usec)) {
1028             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);
1029
1030 #ifdef NETDATA_INTERNAL_CHECKS
1031             if(unlikely(last_usec + microseconds > now_usec + 1000))
1032                 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);
1033 #endif
1034
1035             microseconds = since_last_usec;
1036         }
1037         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1038             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);
1039
1040 #ifdef NETDATA_INTERNAL_CHECKS
1041             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);
1042 #endif
1043             microseconds = since_last_usec;
1044         }
1045     }
1046     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1047
1048     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1049     st->usec_since_last_update = microseconds;
1050 }
1051
1052 unsigned long long rrdset_done(RRDSET *st)
1053 {
1054     if(unlikely(netdata_exit)) return 0;
1055
1056     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1057
1058     RRDDIM *rd;
1059
1060     int
1061         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1062
1063     char
1064         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1065         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1066
1067     unsigned int
1068         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1069
1070     unsigned long long
1071         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1072         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1073         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1074         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1075         update_every_ut = st->update_every * 1000000ULL; // st->update_every in microseconds
1076
1077     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1078         error("Cannot set pthread cancel state to DISABLE.");
1079
1080     // a read lock is OK here
1081     pthread_rwlock_rdlock(&st->rwlock);
1082
1083 /*
1084     // enable the chart, if it was disabled
1085     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1086         st->enabled = 1;
1087 */
1088
1089     // check if the chart has a long time to be updated
1090     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1091         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1092         rrdset_reset(st);
1093         st->usec_since_last_update = update_every_ut;
1094         first_entry = 1;
1095     }
1096     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1097
1098     // set last_collected_time
1099     if(unlikely(!st->last_collected_time.tv_sec)) {
1100         // it is the first entry
1101         // set the last_collected_time to now
1102         gettimeofday(&st->last_collected_time, NULL);
1103
1104         // align it to update_every
1105         st->last_collected_time.tv_sec -= st->last_collected_time.tv_sec % st->update_every;
1106         st->last_collected_time.tv_usec = 0;
1107
1108         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - update_every_ut;
1109
1110         // the first entry should not be stored
1111         store_this_entry = 0;
1112         first_entry = 1;
1113
1114         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);
1115     }
1116     else {
1117         // it is not the first entry
1118         // calculate the proper last_collected_time, using usec_since_last_update
1119         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1120         unsigned long long ut = last_collect_ut + st->usec_since_last_update;
1121         st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
1122         st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
1123     }
1124
1125     // if this set has not been updated in the past
1126     // we fake the last_update time to be = now - usec_since_last_update
1127     if(unlikely(!st->last_updated.tv_sec)) {
1128         // it has never been updated before
1129         // set a fake last_updated, in the past using usec_since_last_update
1130         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1131         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1132         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1133
1134         // the first entry should not be stored
1135         store_this_entry = 0;
1136         first_entry = 1;
1137
1138         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);
1139     }
1140
1141     // check if we will re-write the entire data set
1142     if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1143         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);
1144         rrdset_reset(st);
1145
1146         st->usec_since_last_update = update_every_ut;
1147
1148         gettimeofday(&st->last_collected_time, NULL);
1149
1150         // align it to update_every
1151         st->last_collected_time.tv_sec -= st->last_collected_time.tv_sec % st->update_every;
1152         st->last_collected_time.tv_usec = 0;
1153
1154         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1155         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1156         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1157
1158         // the first entry should not be stored
1159         store_this_entry = 0;
1160         first_entry = 1;
1161     }
1162
1163     // these are the 3 variables that will help us in interpolation
1164     // last_stored_ut = the last time we added a value to the storage
1165     // now_collect_ut = the time the current value has been collected
1166     // next_store_ut  = the time of the next interpolation point
1167     last_stored_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1168     now_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1169     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1170
1171     if(unlikely(st->debug)) {
1172         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1173         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1174         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1175         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1176     }
1177
1178     if(unlikely(!st->counter_done)) {
1179         store_this_entry = 0;
1180         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1181     }
1182     st->counter_done++;
1183
1184     // calculate totals and count the dimensions
1185     int dimensions;
1186     st->collected_total = 0;
1187     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1188         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1189
1190     uint32_t storage_flags = SN_EXISTS;
1191
1192     // process all dimensions to calculate their values
1193     // based on the collected figures only
1194     // at this stage we do not interpolate anything
1195     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1196
1197         if(unlikely(!rd->updated)) {
1198             rd->calculated_value = 0;
1199             continue;
1200         }
1201
1202         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1203             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1204             " collected_value = " COLLECTED_NUMBER_FORMAT
1205             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1206             " calculated_value = " CALCULATED_NUMBER_FORMAT
1207             , st->id, rd->name
1208             , rd->last_collected_value
1209             , rd->collected_value
1210             , rd->last_calculated_value
1211             , rd->calculated_value
1212             );
1213
1214         switch(rd->algorithm) {
1215             case RRDDIM_ABSOLUTE:
1216                 rd->calculated_value = (calculated_number)rd->collected_value
1217                     * (calculated_number)rd->multiplier
1218                     / (calculated_number)rd->divisor;
1219
1220                 if(unlikely(st->debug))
1221                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1222                         CALCULATED_NUMBER_FORMAT " = "
1223                         COLLECTED_NUMBER_FORMAT
1224                         " * " CALCULATED_NUMBER_FORMAT
1225                         " / " CALCULATED_NUMBER_FORMAT
1226                         , st->id, rd->name
1227                         , rd->calculated_value
1228                         , rd->collected_value
1229                         , (calculated_number)rd->multiplier
1230                         , (calculated_number)rd->divisor
1231                         );
1232                 break;
1233
1234             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1235                 if(unlikely(!st->collected_total))
1236                     rd->calculated_value = 0;
1237                 else
1238                     // the percentage of the current value
1239                     // over the total of all dimensions
1240                     rd->calculated_value =
1241                           (calculated_number)100
1242                         * (calculated_number)rd->collected_value
1243                         / (calculated_number)st->collected_total;
1244
1245                 if(unlikely(st->debug))
1246                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1247                         CALCULATED_NUMBER_FORMAT " = 100"
1248                         " * " COLLECTED_NUMBER_FORMAT
1249                         " / " COLLECTED_NUMBER_FORMAT
1250                         , st->id, rd->name
1251                         , rd->calculated_value
1252                         , rd->collected_value
1253                         , st->collected_total
1254                         );
1255                 break;
1256
1257             case RRDDIM_INCREMENTAL:
1258                 if(unlikely(rd->counter <= 1)) {
1259                     rd->calculated_value = 0;
1260                     continue;
1261                 }
1262
1263                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1264                 // to reset the calculation (it will give zero as the calculation for this second)
1265                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1266                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1267                             , st->name, rd->name
1268                             , rd->last_collected_value
1269                             , rd->collected_value);
1270                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1271                     rd->last_collected_value = rd->collected_value;
1272                 }
1273
1274                 rd->calculated_value +=
1275                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1276                     * (calculated_number)rd->multiplier
1277                     / (calculated_number)rd->divisor;
1278
1279                 if(unlikely(st->debug))
1280                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1281                         CALCULATED_NUMBER_FORMAT " = ("
1282                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1283                         ")"
1284                         " * " CALCULATED_NUMBER_FORMAT
1285                         " / " CALCULATED_NUMBER_FORMAT
1286                         , st->id, rd->name
1287                         , rd->calculated_value
1288                         , rd->collected_value, rd->last_collected_value
1289                         , (calculated_number)rd->multiplier
1290                         , (calculated_number)rd->divisor
1291                         );
1292                 break;
1293
1294             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1295                 if(unlikely(rd->counter <= 1)) {
1296                     rd->calculated_value = 0;
1297                     continue;
1298                 }
1299
1300                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1301                 // to reset the calculation (it will give zero as the calculation for this second)
1302                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1303                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1304                     , st->name, rd->name
1305                     , rd->last_collected_value
1306                     , rd->collected_value);
1307                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1308                     rd->last_collected_value = rd->collected_value;
1309                 }
1310
1311                 // the percentage of the current increment
1312                 // over the increment of all dimensions together
1313                 if(unlikely(st->collected_total == st->last_collected_total))
1314                     rd->calculated_value = 0;
1315                 else
1316                     rd->calculated_value =
1317                           (calculated_number)100
1318                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1319                         / (calculated_number)(st->collected_total - st->last_collected_total);
1320
1321                 if(unlikely(st->debug))
1322                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1323                         CALCULATED_NUMBER_FORMAT " = 100"
1324                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1325                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1326                         , st->id, rd->name
1327                         , rd->calculated_value
1328                         , rd->collected_value, rd->last_collected_value
1329                         , st->collected_total, st->last_collected_total
1330                         );
1331                 break;
1332
1333             default:
1334                 // make the default zero, to make sure
1335                 // it gets noticed when we add new types
1336                 rd->calculated_value = 0;
1337
1338                 if(unlikely(st->debug))
1339                     debug(D_RRD_STATS, "%s/%s: CALC "
1340                         CALCULATED_NUMBER_FORMAT " = 0"
1341                         , st->id, rd->name
1342                         , rd->calculated_value
1343                         );
1344                 break;
1345         }
1346
1347         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1348             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1349             " collected_value = " COLLECTED_NUMBER_FORMAT
1350             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1351             " calculated_value = " CALCULATED_NUMBER_FORMAT
1352             , st->id, rd->name
1353             , rd->last_collected_value
1354             , rd->collected_value
1355             , rd->last_calculated_value
1356             , rd->calculated_value
1357             );
1358
1359     }
1360
1361     // at this point we have all the calculated values ready
1362     // it is now time to interpolate values on a second boundary
1363
1364     if(unlikely(now_collect_ut < next_store_ut)) {
1365         // this is collected in the same interpolation point
1366         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1367 #ifdef NETDATA_INTERNAL_CHECKS
1368         info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1369 #endif
1370     }
1371
1372     unsigned long long first_ut = last_stored_ut;
1373     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1374     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1375
1376     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1377 #ifdef NETDATA_INTERNAL_CHECKS
1378         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); }
1379 #endif
1380
1381         if(unlikely(st->debug)) {
1382             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1383             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1384         }
1385
1386         st->last_updated.tv_sec = (time_t) (next_store_ut / 1000000ULL);
1387         st->last_updated.tv_usec = 0;
1388
1389         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1390             calculated_number new_value;
1391
1392             switch(rd->algorithm) {
1393                 case RRDDIM_INCREMENTAL:
1394                     new_value = (calculated_number)
1395                         (      rd->calculated_value
1396                             * (calculated_number)(next_store_ut - last_collect_ut)
1397                             / (calculated_number)(now_collect_ut - last_collect_ut)
1398                         );
1399
1400                     if(unlikely(st->debug))
1401                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1402                             CALCULATED_NUMBER_FORMAT " = "
1403                             CALCULATED_NUMBER_FORMAT
1404                             " * %llu"
1405                             " / %llu"
1406                             , st->id, rd->name
1407                             , new_value
1408                             , rd->calculated_value
1409                             , (next_store_ut - last_stored_ut)
1410                             , (now_collect_ut - last_stored_ut)
1411                             );
1412
1413                     rd->calculated_value -= new_value;
1414                     new_value += rd->last_calculated_value;
1415                     rd->last_calculated_value = 0;
1416                     new_value /= (calculated_number)st->update_every;
1417
1418                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1419                         if(unlikely(st->debug))
1420                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1421                                 st->id, rd->name
1422                                 , (calculated_number)(next_store_ut - last_stored_ut)
1423                                 );
1424                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1425                     }
1426                     break;
1427
1428                 case RRDDIM_ABSOLUTE:
1429                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1430                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1431                 default:
1432                     if(iterations == 1) {
1433                         // this is the last iteration
1434                         // do not interpolate
1435                         // just show the calculated value
1436
1437                         new_value = rd->calculated_value;
1438                     }
1439                     else {
1440                         // we have missed an update
1441                         // interpolate in the middle values
1442
1443                         new_value = (calculated_number)
1444                             (   (     (rd->calculated_value - rd->last_calculated_value)
1445                                     * (calculated_number)(next_store_ut - last_collect_ut)
1446                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1447                                 )
1448                                 +  rd->last_calculated_value
1449                             );
1450
1451                         if(unlikely(st->debug))
1452                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1453                                 CALCULATED_NUMBER_FORMAT " = ((("
1454                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1455                                 " * %llu"
1456                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1457                                 , st->id, rd->name
1458                                 , new_value
1459                                 , rd->calculated_value, rd->last_calculated_value
1460                                 , (next_store_ut - first_ut)
1461                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1462                                 );
1463                     }
1464                     break;
1465             }
1466
1467             if(unlikely(!store_this_entry)) {
1468                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1469                 continue;
1470             }
1471
1472             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1473                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1474                 rd->last_stored_value = new_value;
1475
1476                 if(unlikely(st->debug))
1477                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1478                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1479                         , st->id, rd->name
1480                         , st->current_entry
1481                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1482                         );
1483             }
1484             else {
1485                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1486                         , st->id, rd->name
1487                         , st->current_entry
1488                         );
1489                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1490                 rd->last_stored_value = NAN;
1491             }
1492
1493             stored_entries++;
1494
1495             if(unlikely(st->debug)) {
1496                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1497                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1498                 calculated_number accuracy = accuracy_loss(t1, t2);
1499                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1500                         , st->id, rd->name
1501                         , st->current_entry
1502                         , t2
1503                         , get_storage_number_flags(rd->values[st->current_entry])
1504                         , t1
1505                         , accuracy
1506                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1507                         );
1508
1509                 rd->collected_volume += t1;
1510                 rd->stored_volume += t2;
1511                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1512                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1513                         , st->id, rd->name
1514                         , st->current_entry
1515                         , rd->stored_volume
1516                         , rd->collected_volume
1517                         , accuracy
1518                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1519                         );
1520
1521             }
1522         }
1523         // reset the storage flags for the next point, if any;
1524         storage_flags = SN_EXISTS;
1525
1526         st->counter++;
1527         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1528         last_stored_ut = next_store_ut;
1529     }
1530
1531     st->last_collected_total  = st->collected_total;
1532
1533     for( rd = st->dimensions; rd ; rd = rd->next ) {
1534         if(unlikely(!rd->updated)) continue;
1535
1536         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);
1537         rd->last_collected_value = rd->collected_value;
1538
1539         switch(rd->algorithm) {
1540             case RRDDIM_INCREMENTAL:
1541                 if(unlikely(!first_entry)) {
1542                     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);
1543                     rd->last_calculated_value += rd->calculated_value;
1544                 }
1545                 else {
1546                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1547                 }
1548                 break;
1549
1550             case RRDDIM_ABSOLUTE:
1551             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1552             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1553                 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);
1554                 rd->last_calculated_value = rd->calculated_value;
1555                 break;
1556         }
1557
1558         rd->calculated_value = 0;
1559         rd->collected_value = 0;
1560         rd->updated = 0;
1561
1562         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1563             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1564             " collected_value = " COLLECTED_NUMBER_FORMAT
1565             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1566             " calculated_value = " CALCULATED_NUMBER_FORMAT
1567             , st->id, rd->name
1568             , rd->last_collected_value
1569             , rd->collected_value
1570             , rd->last_calculated_value
1571             , rd->calculated_value
1572             );
1573     }
1574
1575     // ALL DONE ABOUT THE DATA UPDATE
1576     // --------------------------------------------------------------------
1577
1578 /*
1579     // find if there are any obsolete dimensions (not updated recently)
1580     if(unlikely(rrd_delete_unupdated_dimensions)) {
1581
1582         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1583             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1584                 break;
1585
1586         if(unlikely(rd)) {
1587             RRDDIM *last;
1588             // there is dimension to free
1589             // upgrade our read lock to a write lock
1590             pthread_rwlock_unlock(&st->rwlock);
1591             pthread_rwlock_wrlock(&st->rwlock);
1592
1593             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1594                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1595
1596                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1597                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1598
1599                     if(unlikely(!last)) {
1600                         st->dimensions = rd->next;
1601                         rd->next = NULL;
1602                         rrddim_free(st, rd);
1603                         rd = st->dimensions;
1604                         continue;
1605                     }
1606                     else {
1607                         last->next = rd->next;
1608                         rd->next = NULL;
1609                         rrddim_free(st, rd);
1610                         rd = last->next;
1611                         continue;
1612                     }
1613                 }
1614
1615                 last = rd;
1616                 rd = rd->next;
1617             }
1618
1619             if(unlikely(!st->dimensions)) {
1620                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1621                 st->enabled = 0;
1622             }
1623         }
1624     }
1625 */
1626
1627     pthread_rwlock_unlock(&st->rwlock);
1628
1629     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1630         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1631
1632     return(st->usec_since_last_update);
1633 }