src/rrd.c

   1 #include "common.h"
   2
   3 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
   4
   5 // ----------------------------------------------------------------------------
   6 // globals
   7
   8 /*
   9 // if not zero it gives the time (in seconds) to remove un-updated dimensions
  10 // DO NOT ENABLE
  11 // if dimensions are removed, the chart generation will have to run again
  12 int rrd_delete_unupdated_dimensions = 0;
  13 */
  14
  15 int rrd_update_every = UPDATE_EVERY;
  16 int rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
  17 int rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
  18
  19 static int rrdset_compare(void* a, void* b);
  20 static int rrdset_compare_name(void* a, void* b);
  21 static int rrdfamily_compare(void *a, void *b);
  22
  23 // ----------------------------------------------------------------------------
  24 // RRDHOST
  25
  26 RRDHOST localhost = {
  27         .hostname = "localhost",
  28         .rrdset_root = NULL,
  29         .rrdset_root_rwlock = PTHREAD_RWLOCK_INITIALIZER,
  30         .rrdset_root_index = {
  31             { NULL, rrdset_compare },
  32             AVL_LOCK_INITIALIZER
  33         },
  34         .rrdset_root_index_name = {
  35             { NULL, rrdset_compare_name },
  36             AVL_LOCK_INITIALIZER
  37         },
  38         .rrdfamily_root_index = {
  39             { NULL, rrdfamily_compare },
  40             AVL_LOCK_INITIALIZER
  41         },
  42         .variables_root_index = {
  43             { NULL, rrdvar_compare },
  44             AVL_LOCK_INITIALIZER
  45         },
  46         .health_log = {
  47             .next_log_id = 1,
  48             .next_alarm_id = 1,
  49             .count = 0,
  50             .max = 1000,
  51             .alarms = NULL,
  52             .alarm_log_rwlock = PTHREAD_RWLOCK_INITIALIZER
  53         }
  54 };
  55
  56 void rrdhost_init(char *hostname) {
  57     localhost.hostname = hostname;
  58     localhost.health_log.next_log_id =
  59         localhost.health_log.next_alarm_id = time(NULL);
  60 }
  61
  62 void rrdhost_rwlock(RRDHOST *host) {
  63     pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
  64 }
  65
  66 void rrdhost_rdlock(RRDHOST *host) {
  67     pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
  68 }
  69
  70 void rrdhost_unlock(RRDHOST *host) {
  71     pthread_rwlock_unlock(&host->rrdset_root_rwlock);
  72 }
  73
  74 void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
  75     int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
  76
  77     if(ret == 0)
  78         fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
  79 }
  80
  81 void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
  82     int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
  83
  84     if(ret == 0)
  85         fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
  86 }
  87
  88 // ----------------------------------------------------------------------------
  89 // RRDFAMILY index
  90
  91 static int rrdfamily_compare(void *a, void *b) {
  92     if(((RRDFAMILY *)a)->hash_family < ((RRDFAMILY *)b)->hash_family) return -1;
  93     else if(((RRDFAMILY *)a)->hash_family > ((RRDFAMILY *)b)->hash_family) return 1;
  94     else return strcmp(((RRDFAMILY *)a)->family, ((RRDFAMILY *)b)->family);
  95 }
  96
  97 #define rrdfamily_index_add(host, rc) (RRDFAMILY *)avl_insert_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
  98 #define rrdfamily_index_del(host, rc) (RRDFAMILY *)avl_remove_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
  99
 100 static RRDFAMILY *rrdfamily_index_find(RRDHOST *host, const char *id, uint32_t hash) {
 101     RRDFAMILY tmp;
 102     tmp.family = id;
 103     tmp.hash_family = (hash)?hash:simple_hash(tmp.family);
 104
 105     return (RRDFAMILY *)avl_search_lock(&(host->rrdfamily_root_index), (avl *) &tmp);
 106 }
 107
 108 RRDFAMILY *rrdfamily_create(const char *id) {
 109     RRDFAMILY *rc = rrdfamily_index_find(&localhost, id, 0);
 110     if(!rc) {
 111         rc = callocz(1, sizeof(RRDFAMILY));
 112
 113         rc->family = strdupz(id);
 114         rc->hash_family = simple_hash(rc->family);
 115
 116         // initialize the variables index
 117         avl_init_lock(&rc->variables_root_index, rrdvar_compare);
 118
 119         RRDFAMILY *ret = rrdfamily_index_add(&localhost, rc);
 120         if(ret != rc)
 121             fatal("INTERNAL ERROR: Expected to INSERT RRDFAMILY '%s' into index, but inserted '%s'.", rc->family, (ret)?ret->family:"NONE");
 122     }
 123
 124     rc->use_count++;
 125     return rc;
 126 }
 127
 128 void rrdfamily_free(RRDFAMILY *rc) {
 129     rc->use_count--;
 130     if(!rc->use_count) {
 131         RRDFAMILY *ret = rrdfamily_index_del(&localhost, rc);
 132         if(ret != rc)
 133             fatal("INTERNAL ERROR: Expected to DELETE RRDFAMILY '%s' from index, but deleted '%s'.", rc->family, (ret)?ret->family:"NONE");
 134
 135         if(rc->variables_root_index.avl_tree.root != NULL)
 136             fatal("INTERNAL ERROR: Variables index of RRDFAMILY '%s' that is freed, is not empty.", rc->family);
 137
 138         freez((void *)rc->family);
 139         freez(rc);
 140     }
 141 }
 142
 143 // ----------------------------------------------------------------------------
 144 // RRDSET index
 145
 146 static int rrdset_compare(void* a, void* b) {
 147     if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
 148     else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
 149     else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
 150 }
 151
 152 #define rrdset_index_add(host, st) (RRDSET *)avl_insert_lock(&((host)->rrdset_root_index), (avl *)(st))
 153 #define rrdset_index_del(host, st) (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index), (avl *)(st))
 154
 155 static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
 156     RRDSET tmp;
 157     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 158     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 159
 160     return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
 161 }
 162
 163 // ----------------------------------------------------------------------------
 164 // RRDSET name index
 165
 166 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
 167
 168 static int rrdset_compare_name(void* a, void* b) {
 169     RRDSET *A = rrdset_from_avlname(a);
 170     RRDSET *B = rrdset_from_avlname(b);
 171
 172     // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
 173
 174     if(A->hash_name < B->hash_name) return -1;
 175     else if(A->hash_name > B->hash_name) return 1;
 176     else return strcmp(A->name, B->name);
 177 }
 178
 179 RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
 180     void *result;
 181     // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
 182     result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
 183     if(result) return rrdset_from_avlname(result);
 184     return NULL;
 185 }
 186
 187 RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
 188     void *result;
 189     // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
 190     result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
 191     if(result) return rrdset_from_avlname(result);
 192     return NULL;
 193 }
 194
 195 static RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
 196     void *result = NULL;
 197     RRDSET tmp;
 198     tmp.name = name;
 199     tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
 200
 201     // fprintf(stderr, "SEARCHING: %s\n", name);
 202     result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
 203     if(result) {
 204         RRDSET *st = rrdset_from_avlname(result);
 205         if(strcmp(st->magic, RRDSET_MAGIC))
 206             error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
 207
 208         // fprintf(stderr, "FOUND: %s\n", name);
 209         return rrdset_from_avlname(result);
 210     }
 211     // fprintf(stderr, "NOT FOUND: %s\n", name);
 212     return NULL;
 213 }
 214
 215
 216 // ----------------------------------------------------------------------------
 217 // RRDDIM index
 218
 219 static int rrddim_compare(void* a, void* b) {
 220     if(((RRDDIM *)a)->hash < ((RRDDIM *)b)->hash) return -1;
 221     else if(((RRDDIM *)a)->hash > ((RRDDIM *)b)->hash) return 1;
 222     else return strcmp(((RRDDIM *)a)->id, ((RRDDIM *)b)->id);
 223 }
 224
 225 #define rrddim_index_add(st, rd) avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
 226 #define rrddim_index_del(st,rd ) avl_remove_lock(&((st)->dimensions_index), (avl *)(rd))
 227
 228 static RRDDIM *rrddim_index_find(RRDSET *st, const char *id, uint32_t hash) {
 229     RRDDIM tmp;
 230     strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 231     tmp.hash = (hash)?hash:simple_hash(tmp.id);
 232
 233     return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
 234 }
 235
 236 // ----------------------------------------------------------------------------
 237 // chart types
 238
 239 int rrdset_type_id(const char *name)
 240 {
 241     if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0)) return RRDSET_TYPE_AREA;
 242     else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0)) return RRDSET_TYPE_STACKED;
 243     else if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0)) return RRDSET_TYPE_LINE;
 244     return RRDSET_TYPE_LINE;
 245 }
 246
 247 const char *rrdset_type_name(int chart_type)
 248 {
 249     static char line[] = RRDSET_TYPE_LINE_NAME;
 250     static char area[] = RRDSET_TYPE_AREA_NAME;
 251     static char stacked[] = RRDSET_TYPE_STACKED_NAME;
 252
 253     switch(chart_type) {
 254         case RRDSET_TYPE_LINE:
 255             return line;
 256
 257         case RRDSET_TYPE_AREA:
 258             return area;
 259
 260         case RRDSET_TYPE_STACKED:
 261             return stacked;
 262     }
 263     return line;
 264 }
 265
 266 // ----------------------------------------------------------------------------
 267 // load / save
 268
 269 const char *rrd_memory_mode_name(int id)
 270 {
 271     static const char ram[] = RRD_MEMORY_MODE_RAM_NAME;
 272     static const char map[] = RRD_MEMORY_MODE_MAP_NAME;
 273     static const char save[] = RRD_MEMORY_MODE_SAVE_NAME;
 274
 275     switch(id) {
 276         case RRD_MEMORY_MODE_RAM:
 277             return ram;
 278
 279         case RRD_MEMORY_MODE_MAP:
 280             return map;
 281
 282         case RRD_MEMORY_MODE_SAVE:
 283         default:
 284             return save;
 285     }
 286
 287     return save;
 288 }
 289
 290 int rrd_memory_mode_id(const char *name)
 291 {
 292     if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
 293         return RRD_MEMORY_MODE_RAM;
 294     else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
 295         return RRD_MEMORY_MODE_MAP;
 296
 297     return RRD_MEMORY_MODE_SAVE;
 298 }
 299
 300 // ----------------------------------------------------------------------------
 301 // algorithms types
 302
 303 int rrddim_algorithm_id(const char *name)
 304 {
 305     if(strcmp(name, RRDDIM_INCREMENTAL_NAME) == 0)          return RRDDIM_INCREMENTAL;
 306     if(strcmp(name, RRDDIM_ABSOLUTE_NAME) == 0)             return RRDDIM_ABSOLUTE;
 307     if(strcmp(name, RRDDIM_PCENT_OVER_ROW_TOTAL_NAME) == 0)         return RRDDIM_PCENT_OVER_ROW_TOTAL;
 308     if(strcmp(name, RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)    return RRDDIM_PCENT_OVER_DIFF_TOTAL;
 309     return RRDDIM_ABSOLUTE;
 310 }
 311
 312 const char *rrddim_algorithm_name(int chart_type)
 313 {
 314     static char absolute[] = RRDDIM_ABSOLUTE_NAME;
 315     static char incremental[] = RRDDIM_INCREMENTAL_NAME;
 316     static char percentage_of_absolute_row[] = RRDDIM_PCENT_OVER_ROW_TOTAL_NAME;
 317     static char percentage_of_incremental_row[] = RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME;
 318
 319     switch(chart_type) {
 320         case RRDDIM_ABSOLUTE:
 321             return absolute;
 322
 323         case RRDDIM_INCREMENTAL:
 324             return incremental;
 325
 326         case RRDDIM_PCENT_OVER_ROW_TOTAL:
 327             return percentage_of_absolute_row;
 328
 329         case RRDDIM_PCENT_OVER_DIFF_TOTAL:
 330             return percentage_of_incremental_row;
 331     }
 332     return absolute;
 333 }
 334
 335 // ----------------------------------------------------------------------------
 336 // chart names
 337
 338 char *rrdset_strncpyz_name(char *to, const char *from, size_t length)
 339 {
 340     char c, *p = to;
 341
 342     while (length-- && (c = *from++)) {
 343         if(c != '.' && !isalnum(c))
 344             c = '_';
 345
 346         *p++ = c;
 347     }
 348
 349     *p = '\0';
 350
 351     return to;
 352 }
 353
 354 void rrdset_set_name(RRDSET *st, const char *name)
 355 {
 356     debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 357
 358     if(st->name) {
 359         rrdset_index_del_name(&localhost, st);
 360         rrdsetvar_rename_all(st);
 361     }
 362
 363     char b[CONFIG_MAX_VALUE + 1];
 364     char n[RRD_ID_LENGTH_MAX + 1];
 365
 366     snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 367     rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
 368     st->name = config_get(st->id, "name", b);
 369     st->hash_name = simple_hash(st->name);
 370
 371     rrdset_index_add_name(&localhost, st);
 372 }
 373
 374 // ----------------------------------------------------------------------------
 375 // cache directory
 376
 377 char *rrdset_cache_dir(const char *id)
 378 {
 379     char *ret = NULL;
 380
 381     static char *cache_dir = NULL;
 382     if(!cache_dir) {
 383         cache_dir = config_get("global", "cache directory", CACHE_DIR);
 384         int r = mkdir(cache_dir, 0755);
 385         if(r != 0 && errno != EEXIST)
 386             error("Cannot create directory '%s'", cache_dir);
 387     }
 388
 389     char b[FILENAME_MAX + 1];
 390     char n[FILENAME_MAX + 1];
 391     rrdset_strncpyz_name(b, id, FILENAME_MAX);
 392
 393     snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 394     ret = config_get(id, "cache directory", n);
 395
 396     if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 397         int r = mkdir(ret, 0775);
 398         if(r != 0 && errno != EEXIST)
 399             error("Cannot create directory '%s'", ret);
 400     }
 401
 402     return ret;
 403 }
 404
 405 // ----------------------------------------------------------------------------
 406 // core functions
 407
 408 void rrdset_reset(RRDSET *st)
 409 {
 410     debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 411
 412     st->last_collected_time.tv_sec = 0;
 413     st->last_collected_time.tv_usec = 0;
 414     st->last_updated.tv_sec = 0;
 415     st->last_updated.tv_usec = 0;
 416     st->current_entry = 0;
 417     st->counter = 0;
 418     st->counter_done = 0;
 419
 420     RRDDIM *rd;
 421     for(rd = st->dimensions; rd ; rd = rd->next) {
 422         rd->last_collected_time.tv_sec = 0;
 423         rd->last_collected_time.tv_usec = 0;
 424         rd->counter = 0;
 425         memset(rd->values, 0, rd->entries * sizeof(storage_number));
 426     }
 427 }
 428 static long align_entries_to_pagesize(long entries) {
 429     if(entries < 5) entries = 5;
 430     if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
 431
 432 #ifdef NETDATA_LOG_ALLOCATIONS
 433     long page = (size_t)sysconf(_SC_PAGESIZE);
 434
 435     long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
 436     if(size % page) {
 437         size -= (size % page);
 438         size += page;
 439
 440         long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
 441         return n;
 442     }
 443
 444     return entries;
 445 #else
 446     return entries;
 447 #endif
 448 }
 449
 450 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)
 451 {
 452     if(!type || !type[0]) {
 453         fatal("Cannot create rrd stats without a type.");
 454         return NULL;
 455     }
 456
 457     if(!id || !id[0]) {
 458         fatal("Cannot create rrd stats without an id.");
 459         return NULL;
 460     }
 461
 462     char fullid[RRD_ID_LENGTH_MAX + 1];
 463     char fullfilename[FILENAME_MAX + 1];
 464     RRDSET *st = NULL;
 465
 466     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 467
 468     st = rrdset_find(fullid);
 469     if(st) {
 470         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 471         return st;
 472     }
 473
 474     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 475     long entries = align_entries_to_pagesize(rentries);
 476     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 477
 478     int enabled = config_get_boolean(fullid, "enabled", 1);
 479     if(!enabled) entries = 5;
 480
 481     unsigned long size = sizeof(RRDSET);
 482     char *cache_dir = rrdset_cache_dir(fullid);
 483
 484     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 485
 486     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 487     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);
 488     if(st) {
 489         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 490             errno = 0;
 491             info("Initializing file %s.", fullfilename);
 492             memset(st, 0, size);
 493         }
 494         else if(strcmp(st->id, fullid) != 0) {
 495             errno = 0;
 496             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 497             // munmap(st, size);
 498             // st = NULL;
 499             memset(st, 0, size);
 500         }
 501         else if(st->memsize != size || st->entries != entries) {
 502             errno = 0;
 503             error("File %s does not have the desired size. Clearing it.", fullfilename);
 504             memset(st, 0, size);
 505         }
 506         else if(st->update_every != update_every) {
 507             errno = 0;
 508             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 509             memset(st, 0, size);
 510         }
 511         else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 512             errno = 0;
 513             error("File %s is too old. Clearing it.", fullfilename);
 514             memset(st, 0, size);
 515         }
 516     }
 517
 518     if(st) {
 519         st->name = NULL;
 520         st->type = NULL;
 521         st->family = NULL;
 522         st->context = NULL;
 523         st->title = NULL;
 524         st->units = NULL;
 525         st->dimensions = NULL;
 526         st->next = NULL;
 527         st->mapped = rrd_memory_mode;
 528         st->variables = NULL;
 529         st->alarms = NULL;
 530     }
 531     else {
 532         st = callocz(1, size);
 533         st->mapped = RRD_MEMORY_MODE_RAM;
 534     }
 535
 536     st->memsize = size;
 537     st->entries = entries;
 538     st->update_every = update_every;
 539
 540     if(st->current_entry >= st->entries) st->current_entry = 0;
 541
 542     strcpy(st->cache_filename, fullfilename);
 543     strcpy(st->magic, RRDSET_MAGIC);
 544
 545     strcpy(st->id, fullid);
 546     st->hash = simple_hash(st->id);
 547
 548     st->cache_dir = cache_dir;
 549
 550     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 551     st->type       = config_get(st->id, "type", type);
 552     st->family     = config_get(st->id, "family", family?family:st->type);
 553     st->units      = config_get(st->id, "units", units?units:"");
 554
 555     st->context    = config_get(st->id, "context", context?context:st->id);
 556     st->hash_context = simple_hash(st->context);
 557
 558     st->priority = config_get_number(st->id, "priority", priority);
 559     st->enabled = enabled;
 560
 561     st->isdetail = 0;
 562     st->debug = 0;
 563
 564     // if(!strcmp(st->id, "disk_util.dm-0")) {
 565     //     st->debug = 1;
 566     //     error("enabled debugging for '%s'", st->id);
 567     // }
 568     // else error("not enabled debugging for '%s'", st->id);
 569
 570     st->green = NAN;
 571     st->red = NAN;
 572
 573     st->last_collected_time.tv_sec = 0;
 574     st->last_collected_time.tv_usec = 0;
 575     st->counter_done = 0;
 576
 577     st->gap_when_lost_iterations_above = (int) (
 578             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 579
 580     avl_init_lock(&st->dimensions_index, rrddim_compare);
 581     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 582
 583     pthread_rwlock_init(&st->rwlock, NULL);
 584     rrdhost_rwlock(&localhost);
 585
 586     if(name && *name) rrdset_set_name(st, name);
 587     else rrdset_set_name(st, id);
 588
 589     {
 590         char varvalue[CONFIG_MAX_VALUE + 1];
 591         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 592         st->title = config_get(st->id, "title", varvalue);
 593     }
 594
 595     st->rrdfamily = rrdfamily_create(st->family);
 596     st->rrdhost = &localhost;
 597
 598     st->next = localhost.rrdset_root;
 599     localhost.rrdset_root = st;
 600
 601     if(health_enabled) {
 602         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 603         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 604         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 605         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 606         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 607     }
 608
 609     rrdset_index_add(&localhost, st);
 610
 611     rrdsetcalc_link_matching(st);
 612     rrdcalctemplate_link_matching(st);
 613
 614     rrdhost_unlock(&localhost);
 615
 616     return(st);
 617 }
 618
 619 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 620 {
 621     char filename[FILENAME_MAX + 1];
 622     char fullfilename[FILENAME_MAX + 1];
 623
 624     char varname[CONFIG_MAX_NAME + 1];
 625     RRDDIM *rd = NULL;
 626     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 627
 628     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 629
 630     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 631     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 632     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);
 633     if(rd) {
 634         struct timeval now;
 635         gettimeofday(&now, NULL);
 636
 637         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 638             errno = 0;
 639             info("Initializing file %s.", fullfilename);
 640             memset(rd, 0, size);
 641         }
 642         else if(rd->memsize != size) {
 643             errno = 0;
 644             error("File %s does not have the desired size. Clearing it.", fullfilename);
 645             memset(rd, 0, size);
 646         }
 647         else if(rd->multiplier != multiplier) {
 648             errno = 0;
 649             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 650             memset(rd, 0, size);
 651         }
 652         else if(rd->divisor != divisor) {
 653             errno = 0;
 654             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 655             memset(rd, 0, size);
 656         }
 657         else if(rd->algorithm != algorithm) {
 658             errno = 0;
 659             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 660             memset(rd, 0, size);
 661         }
 662         else if(rd->update_every != st->update_every) {
 663             errno = 0;
 664             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 665             memset(rd, 0, size);
 666         }
 667         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 668             errno = 0;
 669             error("File %s is too old. Clearing it.", fullfilename);
 670             memset(rd, 0, size);
 671         }
 672         else if(strcmp(rd->id, id) != 0) {
 673             errno = 0;
 674             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 675             // munmap(rd, size);
 676             // rd = NULL;
 677             memset(rd, 0, size);
 678         }
 679     }
 680
 681     if(rd) {
 682         // we have a file mapped for rd
 683         rd->mapped = rrd_memory_mode;
 684         rd->flags = 0x00000000;
 685         rd->variables = NULL;
 686         rd->next = NULL;
 687         rd->name = NULL;
 688     }
 689     else {
 690         // if we didn't manage to get a mmap'd dimension, just create one
 691
 692         rd = callocz(1, size);
 693         rd->mapped = RRD_MEMORY_MODE_RAM;
 694     }
 695     rd->memsize = size;
 696
 697     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 698     strcpy(rd->cache_filename, fullfilename);
 699     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 700     rd->hash = simple_hash(rd->id);
 701
 702     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 703     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 704
 705     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 706     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 707
 708     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 709     rd->multiplier = config_get_number(st->id, varname, multiplier);
 710
 711     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 712     rd->divisor = config_get_number(st->id, varname, divisor);
 713     if(!rd->divisor) rd->divisor = 1;
 714
 715     rd->entries = st->entries;
 716     rd->update_every = st->update_every;
 717
 718     // prevent incremental calculation spikes
 719     rd->counter = 0;
 720     rd->updated = 0;
 721     rd->calculated_value = 0;
 722     rd->last_calculated_value = 0;
 723     rd->collected_value = 0;
 724     rd->last_collected_value = 0;
 725     rd->collected_volume = 0;
 726     rd->stored_volume = 0;
 727     rd->last_stored_value = 0;
 728     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 729     rd->last_collected_time.tv_sec = 0;
 730     rd->last_collected_time.tv_usec = 0;
 731     rd->rrdset = st;
 732
 733     // append this dimension
 734     pthread_rwlock_wrlock(&st->rwlock);
 735     if(!st->dimensions)
 736         st->dimensions = rd;
 737     else {
 738         RRDDIM *td = st->dimensions;
 739         for(; td->next; td = td->next) ;
 740         td->next = rd;
 741     }
 742
 743     if(health_enabled) {
 744         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 745         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 746         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 747     }
 748
 749     pthread_rwlock_unlock(&st->rwlock);
 750
 751     rrddim_index_add(st, rd);
 752
 753     return(rd);
 754 }
 755
 756 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 757 {
 758     debug(D_RRD_CALLS, "rrddim_set_name() %s.%s", st->name, rd->name);
 759
 760     char varname[CONFIG_MAX_NAME + 1];
 761     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 762     config_set_default(st->id, varname, name);
 763
 764     rrddimvar_rename_all(rd);
 765 }
 766
 767 void rrddim_free(RRDSET *st, RRDDIM *rd)
 768 {
 769     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 770
 771     if(rd == st->dimensions)
 772         st->dimensions = rd->next;
 773     else {
 774         RRDDIM *i;
 775         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 776
 777         if (i && i->next == rd)
 778             i->next = rd->next;
 779         else
 780             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 781     }
 782     rd->next = NULL;
 783
 784     while(rd->variables)
 785         rrddimvar_free(rd->variables);
 786
 787     rrddim_index_del(st, rd);
 788
 789     // free(rd->annotations);
 790     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 791         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 792         savememory(rd->cache_filename, rd, rd->memsize);
 793
 794         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 795         munmap(rd, rd->memsize);
 796     }
 797     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 798         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 799         munmap(rd, rd->memsize);
 800     }
 801     else {
 802         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 803         freez(rd);
 804     }
 805 }
 806
 807 void rrdset_free_all(void)
 808 {
 809     info("Freeing all memory...");
 810
 811     rrdhost_rwlock(&localhost);
 812
 813     RRDSET *st;
 814     for(st = localhost.rrdset_root; st ;) {
 815         RRDSET *next = st->next;
 816
 817         pthread_rwlock_wrlock(&st->rwlock);
 818
 819         while(st->variables)
 820             rrdsetvar_free(st->variables);
 821
 822         while(st->alarms)
 823             rrdsetcalc_unlink(st->alarms);
 824
 825         while(st->dimensions)
 826             rrddim_free(st, st->dimensions);
 827
 828         rrdset_index_del(&localhost, st);
 829
 830         st->rrdfamily->use_count--;
 831         if(!st->rrdfamily->use_count)
 832             rrdfamily_free(st->rrdfamily);
 833
 834         pthread_rwlock_unlock(&st->rwlock);
 835
 836         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 837             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 838             savememory(st->cache_filename, st, st->memsize);
 839
 840             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 841             munmap(st, st->memsize);
 842         }
 843         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 844             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 845             munmap(st, st->memsize);
 846         }
 847         else
 848             freez(st);
 849
 850         st = next;
 851     }
 852     localhost.rrdset_root = NULL;
 853
 854     rrdhost_unlock(&localhost);
 855
 856     info("Memory cleanup completed...");
 857 }
 858
 859 void rrdset_save_all(void) {
 860     info("Saving database...");
 861
 862     RRDSET *st;
 863     RRDDIM *rd;
 864
 865     rrdhost_rwlock(&localhost);
 866     for(st = localhost.rrdset_root; st ; st = st->next) {
 867         pthread_rwlock_wrlock(&st->rwlock);
 868
 869         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 870             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 871             savememory(st->cache_filename, st, st->memsize);
 872         }
 873
 874         for(rd = st->dimensions; rd ; rd = rd->next) {
 875             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 876                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 877                 savememory(rd->cache_filename, rd, rd->memsize);
 878             }
 879         }
 880
 881         pthread_rwlock_unlock(&st->rwlock);
 882     }
 883     rrdhost_unlock(&localhost);
 884 }
 885
 886
 887 RRDSET *rrdset_find(const char *id)
 888 {
 889     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 890
 891     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 892     return(st);
 893 }
 894
 895 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 896 {
 897     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 898
 899     char buf[RRD_ID_LENGTH_MAX + 1];
 900
 901     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 902     strcat(buf, ".");
 903     int len = (int) strlen(buf);
 904     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 905
 906     return(rrdset_find(buf));
 907 }
 908
 909 RRDSET *rrdset_find_byname(const char *name)
 910 {
 911     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 912
 913     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 914     return(st);
 915 }
 916
 917 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 918 {
 919     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 920
 921     return rrddim_index_find(st, id, 0);
 922 }
 923
 924 int rrddim_hide(RRDSET *st, const char *id)
 925 {
 926     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 927
 928     RRDDIM *rd = rrddim_find(st, id);
 929     if(unlikely(!rd)) {
 930         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 931         return 1;
 932     }
 933
 934     rd->flags |= RRDDIM_FLAG_HIDDEN;
 935     return 0;
 936 }
 937
 938 int rrddim_unhide(RRDSET *st, const char *id)
 939 {
 940     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 941
 942     RRDDIM *rd = rrddim_find(st, id);
 943     if(unlikely(!rd)) {
 944         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 945         return 1;
 946     }
 947
 948     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 949     return 0;
 950 }
 951
 952 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 953 {
 954     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 955
 956     gettimeofday(&rd->last_collected_time, NULL);
 957     rd->collected_value = value;
 958     rd->updated = 1;
 959     rd->counter++;
 960
 961     // 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));
 962
 963     return rd->last_collected_value;
 964 }
 965
 966 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 967 {
 968     RRDDIM *rd = rrddim_find(st, id);
 969     if(unlikely(!rd)) {
 970         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 971         return 0;
 972     }
 973
 974     return rrddim_set_by_pointer(st, rd, value);
 975 }
 976
 977 void rrdset_next_usec_unfiltered(RRDSET *st, unsigned long long microseconds)
 978 {
 979     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
 980         // the first entry
 981         microseconds = st->update_every * 1000000ULL;
 982     }
 983     st->usec_since_last_update = microseconds;
 984 }
 985
 986 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
 987 {
 988     struct timeval now;
 989     gettimeofday(&now, NULL);
 990
 991     if(unlikely(!st->last_collected_time.tv_sec)) {
 992         // the first entry
 993         microseconds = st->update_every * 1000000ULL;
 994     }
 995     else if(unlikely(!microseconds)) {
 996         // no dt given by the plugin
 997         microseconds = usec_dt(&now, &st->last_collected_time);
 998     }
 999     else {
1000         // microseconds has the time since the last collection
1001         unsigned long long now_usec = timeval_usec(&now);
1002         unsigned long long last_usec = timeval_usec(&st->last_collected_time);
1003         unsigned long long since_last_usec = usec_dt(&now, &st->last_collected_time);
1004
1005         // verify the microseconds given is good
1006         if(unlikely(last_usec + microseconds > now_usec)) {
1007             debug(D_RRD_CALLS, "dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, last_usec + microseconds - now_usec, st->name, st->id);
1008
1009 #ifdef NETDATA_INTERNAL_CHECKS
1010             if(unlikely(last_usec + microseconds > now_usec + 1000))
1011                 error("dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, last_usec + microseconds - now_usec, st->name, st->id);
1012 #endif
1013
1014             microseconds = since_last_usec;
1015         }
1016         else if(unlikely(microseconds < since_last_usec * 0.8 || microseconds > since_last_usec * 1.2)) {
1017             debug(D_RRD_CALLS, "dt %llu usec given is wrong - expected %llu usec +/- 20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
1018
1019 #ifdef NETDATA_INTERNAL_CHECKS
1020             error("dt %llu usec given is wrong - expected %llu usec +/- 20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
1021 #endif
1022             microseconds = since_last_usec;
1023         }
1024     }
1025     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1026
1027     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1028     st->usec_since_last_update = microseconds;
1029 }
1030
1031 unsigned long long rrdset_done(RRDSET *st)
1032 {
1033     if(unlikely(netdata_exit)) return 0;
1034
1035     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1036
1037     RRDDIM *rd;
1038
1039     int
1040         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1041
1042     char
1043         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1044         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1045
1046     unsigned int
1047         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1048
1049     unsigned long long
1050         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1051         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1052         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1053         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1054         update_every_ut = st->update_every * 1000000ULL; // st->update_every in microseconds
1055
1056     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1057         error("Cannot set pthread cancel state to DISABLE.");
1058
1059     // a read lock is OK here
1060     pthread_rwlock_rdlock(&st->rwlock);
1061
1062 /*
1063     // enable the chart, if it was disabled
1064     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1065         st->enabled = 1;
1066 */
1067
1068     // check if the chart has a long time to be updated
1069     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1070         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1071         rrdset_reset(st);
1072         st->usec_since_last_update = update_every_ut;
1073         first_entry = 1;
1074     }
1075     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1076
1077     // set last_collected_time
1078     if(unlikely(!st->last_collected_time.tv_sec)) {
1079         // it is the first entry
1080         // set the last_collected_time to now
1081         gettimeofday(&st->last_collected_time, NULL);
1082         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - update_every_ut;
1083
1084         // the first entry should not be stored
1085         store_this_entry = 0;
1086         first_entry = 1;
1087
1088         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);
1089     }
1090     else {
1091         // it is not the first entry
1092         // calculate the proper last_collected_time, using usec_since_last_update
1093         last_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1094         unsigned long long ut = last_collect_ut + st->usec_since_last_update;
1095         st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
1096         st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
1097     }
1098
1099     // if this set has not been updated in the past
1100     // we fake the last_update time to be = now - usec_since_last_update
1101     if(unlikely(!st->last_updated.tv_sec)) {
1102         // it has never been updated before
1103         // set a fake last_updated, in the past using usec_since_last_update
1104         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1105         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1106         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1107
1108         // the first entry should not be stored
1109         store_this_entry = 0;
1110         first_entry = 1;
1111
1112         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);
1113     }
1114
1115     // check if we will re-write the entire data set
1116     if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
1117         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);
1118         rrdset_reset(st);
1119
1120         st->usec_since_last_update = update_every_ut;
1121
1122         gettimeofday(&st->last_collected_time, NULL);
1123
1124         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1125         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1126         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1127
1128         // the first entry should not be stored
1129         store_this_entry = 0;
1130         first_entry = 1;
1131     }
1132
1133     // these are the 3 variables that will help us in interpolation
1134     // last_stored_ut = the last time we added a value to the storage
1135     // now_collect_ut = the time the current value has been collected
1136     // next_store_ut  = the time of the next interpolation point
1137     last_stored_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1138     now_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1139     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1140
1141     if(unlikely(st->debug)) {
1142         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1143         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1144         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1145         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1146     }
1147
1148     if(unlikely(!st->counter_done)) {
1149         store_this_entry = 0;
1150         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1151     }
1152     st->counter_done++;
1153
1154     // calculate totals and count the dimensions
1155     int dimensions;
1156     st->collected_total = 0;
1157     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1158         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1159
1160     uint32_t storage_flags = SN_EXISTS;
1161
1162     // process all dimensions to calculate their values
1163     // based on the collected figures only
1164     // at this stage we do not interpolate anything
1165     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1166
1167         if(unlikely(!rd->updated)) {
1168             rd->calculated_value = 0;
1169             continue;
1170         }
1171
1172         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1173             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1174             " collected_value = " COLLECTED_NUMBER_FORMAT
1175             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1176             " calculated_value = " CALCULATED_NUMBER_FORMAT
1177             , st->id, rd->name
1178             , rd->last_collected_value
1179             , rd->collected_value
1180             , rd->last_calculated_value
1181             , rd->calculated_value
1182             );
1183
1184         switch(rd->algorithm) {
1185             case RRDDIM_ABSOLUTE:
1186                 rd->calculated_value = (calculated_number)rd->collected_value
1187                     * (calculated_number)rd->multiplier
1188                     / (calculated_number)rd->divisor;
1189
1190                 if(unlikely(st->debug))
1191                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1192                         CALCULATED_NUMBER_FORMAT " = "
1193                         COLLECTED_NUMBER_FORMAT
1194                         " * " CALCULATED_NUMBER_FORMAT
1195                         " / " CALCULATED_NUMBER_FORMAT
1196                         , st->id, rd->name
1197                         , rd->calculated_value
1198                         , rd->collected_value
1199                         , (calculated_number)rd->multiplier
1200                         , (calculated_number)rd->divisor
1201                         );
1202                 break;
1203
1204             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1205                 if(unlikely(!st->collected_total))
1206                     rd->calculated_value = 0;
1207                 else
1208                     // the percentage of the current value
1209                     // over the total of all dimensions
1210                     rd->calculated_value =
1211                           (calculated_number)100
1212                         * (calculated_number)rd->collected_value
1213                         / (calculated_number)st->collected_total;
1214
1215                 if(unlikely(st->debug))
1216                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1217                         CALCULATED_NUMBER_FORMAT " = 100"
1218                         " * " COLLECTED_NUMBER_FORMAT
1219                         " / " COLLECTED_NUMBER_FORMAT
1220                         , st->id, rd->name
1221                         , rd->calculated_value
1222                         , rd->collected_value
1223                         , st->collected_total
1224                         );
1225                 break;
1226
1227             case RRDDIM_INCREMENTAL:
1228                 if(unlikely(rd->counter <= 1)) {
1229                     rd->calculated_value = 0;
1230                     continue;
1231                 }
1232
1233                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1234                 // to reset the calculation (it will give zero as the calculation for this second)
1235                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1236                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1237                             , st->name, rd->name
1238                             , rd->last_collected_value
1239                             , rd->collected_value);
1240                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1241                     rd->last_collected_value = rd->collected_value;
1242                 }
1243
1244                 rd->calculated_value +=
1245                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1246                     * (calculated_number)rd->multiplier
1247                     / (calculated_number)rd->divisor;
1248
1249                 if(unlikely(st->debug))
1250                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1251                         CALCULATED_NUMBER_FORMAT " = ("
1252                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1253                         ")"
1254                         " * " CALCULATED_NUMBER_FORMAT
1255                         " / " CALCULATED_NUMBER_FORMAT
1256                         , st->id, rd->name
1257                         , rd->calculated_value
1258                         , rd->collected_value, rd->last_collected_value
1259                         , (calculated_number)rd->multiplier
1260                         , (calculated_number)rd->divisor
1261                         );
1262                 break;
1263
1264             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1265                 if(unlikely(rd->counter <= 1)) {
1266                     rd->calculated_value = 0;
1267                     continue;
1268                 }
1269
1270                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1271                 // to reset the calculation (it will give zero as the calculation for this second)
1272                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1273                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1274                     , st->name, rd->name
1275                     , rd->last_collected_value
1276                     , rd->collected_value);
1277                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1278                     rd->last_collected_value = rd->collected_value;
1279                 }
1280
1281                 // the percentage of the current increment
1282                 // over the increment of all dimensions together
1283                 if(unlikely(st->collected_total == st->last_collected_total))
1284                     rd->calculated_value = 0;
1285                 else
1286                     rd->calculated_value =
1287                           (calculated_number)100
1288                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1289                         / (calculated_number)(st->collected_total - st->last_collected_total);
1290
1291                 if(unlikely(st->debug))
1292                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1293                         CALCULATED_NUMBER_FORMAT " = 100"
1294                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1295                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1296                         , st->id, rd->name
1297                         , rd->calculated_value
1298                         , rd->collected_value, rd->last_collected_value
1299                         , st->collected_total, st->last_collected_total
1300                         );
1301                 break;
1302
1303             default:
1304                 // make the default zero, to make sure
1305                 // it gets noticed when we add new types
1306                 rd->calculated_value = 0;
1307
1308                 if(unlikely(st->debug))
1309                     debug(D_RRD_STATS, "%s/%s: CALC "
1310                         CALCULATED_NUMBER_FORMAT " = 0"
1311                         , st->id, rd->name
1312                         , rd->calculated_value
1313                         );
1314                 break;
1315         }
1316
1317         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1318             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1319             " collected_value = " COLLECTED_NUMBER_FORMAT
1320             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1321             " calculated_value = " CALCULATED_NUMBER_FORMAT
1322             , st->id, rd->name
1323             , rd->last_collected_value
1324             , rd->collected_value
1325             , rd->last_calculated_value
1326             , rd->calculated_value
1327             );
1328
1329     }
1330
1331     // at this point we have all the calculated values ready
1332     // it is now time to interpolate values on a second boundary
1333
1334     if(unlikely(now_collect_ut < next_store_ut)) {
1335         // this is collected in the same interpolation point
1336         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1337     }
1338
1339     unsigned long long first_ut = last_stored_ut;
1340     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1341     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1342
1343     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1344 #ifdef NETDATA_INTERNAL_CHECKS
1345         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); }
1346 #endif
1347
1348         if(unlikely(st->debug)) {
1349             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1350             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1351         }
1352
1353         st->last_updated.tv_sec = (time_t) (next_store_ut / 1000000ULL);
1354         st->last_updated.tv_usec = 0;
1355
1356         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1357             calculated_number new_value;
1358
1359             switch(rd->algorithm) {
1360                 case RRDDIM_INCREMENTAL:
1361                     new_value = (calculated_number)
1362                         (      rd->calculated_value
1363                             * (calculated_number)(next_store_ut - last_collect_ut)
1364                             / (calculated_number)(now_collect_ut - last_collect_ut)
1365                         );
1366
1367                     if(unlikely(st->debug))
1368                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1369                             CALCULATED_NUMBER_FORMAT " = "
1370                             CALCULATED_NUMBER_FORMAT
1371                             " * %llu"
1372                             " / %llu"
1373                             , st->id, rd->name
1374                             , new_value
1375                             , rd->calculated_value
1376                             , (next_store_ut - last_stored_ut)
1377                             , (now_collect_ut - last_stored_ut)
1378                             );
1379
1380                     rd->calculated_value -= new_value;
1381                     new_value += rd->last_calculated_value;
1382                     rd->last_calculated_value = 0;
1383                     new_value /= (calculated_number)st->update_every;
1384
1385                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1386                         if(unlikely(st->debug))
1387                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1388                                 st->id, rd->name
1389                                 , (calculated_number)(next_store_ut - last_stored_ut)
1390                                 );
1391                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1392                     }
1393                     break;
1394
1395                 case RRDDIM_ABSOLUTE:
1396                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1397                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1398                 default:
1399                     if(iterations == 1) {
1400                         // this is the last iteration
1401                         // do not interpolate
1402                         // just show the calculated value
1403
1404                         new_value = rd->calculated_value;
1405                     }
1406                     else {
1407                         // we have missed an update
1408                         // interpolate in the middle values
1409
1410                         new_value = (calculated_number)
1411                             (   (     (rd->calculated_value - rd->last_calculated_value)
1412                                     * (calculated_number)(next_store_ut - last_collect_ut)
1413                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1414                                 )
1415                                 +  rd->last_calculated_value
1416                             );
1417
1418                         if(unlikely(st->debug))
1419                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1420                                 CALCULATED_NUMBER_FORMAT " = ((("
1421                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1422                                 " * %llu"
1423                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1424                                 , st->id, rd->name
1425                                 , new_value
1426                                 , rd->calculated_value, rd->last_calculated_value
1427                                 , (next_store_ut - first_ut)
1428                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1429                                 );
1430                     }
1431                     break;
1432             }
1433
1434             if(unlikely(!store_this_entry)) {
1435                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1436                 continue;
1437             }
1438
1439             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1440                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1441                 rd->last_stored_value = new_value;
1442
1443                 if(unlikely(st->debug))
1444                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1445                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1446                         , st->id, rd->name
1447                         , st->current_entry
1448                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1449                         );
1450             }
1451             else {
1452                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1453                         , st->id, rd->name
1454                         , st->current_entry
1455                         );
1456                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1457                 rd->last_stored_value = NAN;
1458             }
1459
1460             stored_entries++;
1461
1462             if(unlikely(st->debug)) {
1463                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1464                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1465                 calculated_number accuracy = accuracy_loss(t1, t2);
1466                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1467                         , st->id, rd->name
1468                         , st->current_entry
1469                         , t2
1470                         , get_storage_number_flags(rd->values[st->current_entry])
1471                         , t1
1472                         , accuracy
1473                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1474                         );
1475
1476                 rd->collected_volume += t1;
1477                 rd->stored_volume += t2;
1478                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1479                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1480                         , st->id, rd->name
1481                         , st->current_entry
1482                         , rd->stored_volume
1483                         , rd->collected_volume
1484                         , accuracy
1485                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1486                         );
1487
1488             }
1489         }
1490         // reset the storage flags for the next point, if any;
1491         storage_flags = SN_EXISTS;
1492
1493         st->counter++;
1494         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1495         last_stored_ut = next_store_ut;
1496     }
1497
1498     st->last_collected_total  = st->collected_total;
1499
1500     for( rd = st->dimensions; rd ; rd = rd->next ) {
1501         if(unlikely(!rd->updated)) continue;
1502
1503         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);
1504         rd->last_collected_value = rd->collected_value;
1505
1506         switch(rd->algorithm) {
1507             case RRDDIM_INCREMENTAL:
1508                 if(unlikely(!first_entry)) {
1509                     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);
1510                     rd->last_calculated_value += rd->calculated_value;
1511                 }
1512                 else {
1513                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1514                 }
1515                 break;
1516
1517             case RRDDIM_ABSOLUTE:
1518             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1519             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1520                 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);
1521                 rd->last_calculated_value = rd->calculated_value;
1522                 break;
1523         }
1524
1525         rd->calculated_value = 0;
1526         rd->collected_value = 0;
1527         rd->updated = 0;
1528
1529         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1530             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1531             " collected_value = " COLLECTED_NUMBER_FORMAT
1532             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1533             " calculated_value = " CALCULATED_NUMBER_FORMAT
1534             , st->id, rd->name
1535             , rd->last_collected_value
1536             , rd->collected_value
1537             , rd->last_calculated_value
1538             , rd->calculated_value
1539             );
1540     }
1541
1542     // ALL DONE ABOUT THE DATA UPDATE
1543     // --------------------------------------------------------------------
1544
1545 /*
1546     // find if there are any obsolete dimensions (not updated recently)
1547     if(unlikely(rrd_delete_unupdated_dimensions)) {
1548
1549         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1550             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1551                 break;
1552
1553         if(unlikely(rd)) {
1554             RRDDIM *last;
1555             // there is dimension to free
1556             // upgrade our read lock to a write lock
1557             pthread_rwlock_unlock(&st->rwlock);
1558             pthread_rwlock_wrlock(&st->rwlock);
1559
1560             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1561                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1562
1563                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1564                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1565
1566                     if(unlikely(!last)) {
1567                         st->dimensions = rd->next;
1568                         rd->next = NULL;
1569                         rrddim_free(st, rd);
1570                         rd = st->dimensions;
1571                         continue;
1572                     }
1573                     else {
1574                         last->next = rd->next;
1575                         rd->next = NULL;
1576                         rrddim_free(st, rd);
1577                         rd = last->next;
1578                         continue;
1579                     }
1580                 }
1581
1582                 last = rd;
1583                 rd = rd->next;
1584             }
1585
1586             if(unlikely(!st->dimensions)) {
1587                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1588                 st->enabled = 0;
1589             }
1590         }
1591     }
1592 */
1593
1594     pthread_rwlock_unlock(&st->rwlock);
1595
1596     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1597         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1598
1599     return(st->usec_since_last_update);
1600 }