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 = now_realtime_sec();
  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 inline 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 static inline void timeval_align(struct timeval *tv, int update_every) {
 464     tv->tv_sec -= tv->tv_sec % update_every;
 465     tv->tv_usec = 500000;
 466 }
 467
 468 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)
 469 {
 470     if(!type || !type[0]) {
 471         fatal("Cannot create rrd stats without a type.");
 472         return NULL;
 473     }
 474
 475     if(!id || !id[0]) {
 476         fatal("Cannot create rrd stats without an id.");
 477         return NULL;
 478     }
 479
 480     char fullid[RRD_ID_LENGTH_MAX + 1];
 481     char fullfilename[FILENAME_MAX + 1];
 482
 483     snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 484
 485     RRDSET *st = rrdset_find(fullid);
 486     if(st) {
 487         error("Cannot create rrd stats for '%s', it already exists.", fullid);
 488         return st;
 489     }
 490
 491     long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
 492     long entries = align_entries_to_pagesize(rentries);
 493     if(entries != rentries) entries = config_set_number(fullid, "history", entries);
 494
 495     int enabled = config_get_boolean(fullid, "enabled", 1);
 496     if(!enabled) entries = 5;
 497
 498     unsigned long size = sizeof(RRDSET);
 499     char *cache_dir = rrdset_cache_dir(fullid);
 500
 501     debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 502
 503     snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 504     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);
 505     if(st) {
 506         if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 507             errno = 0;
 508             info("Initializing file %s.", fullfilename);
 509             memset(st, 0, size);
 510         }
 511         else if(strcmp(st->id, fullid) != 0) {
 512             errno = 0;
 513             error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 514             // munmap(st, size);
 515             // st = NULL;
 516             memset(st, 0, size);
 517         }
 518         else if(st->memsize != size || st->entries != entries) {
 519             errno = 0;
 520             error("File %s does not have the desired size. Clearing it.", fullfilename);
 521             memset(st, 0, size);
 522         }
 523         else if(st->update_every != update_every) {
 524             errno = 0;
 525             error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 526             memset(st, 0, size);
 527         }
 528         else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
 529             errno = 0;
 530             error("File %s is too old. Clearing it.", fullfilename);
 531             memset(st, 0, size);
 532         }
 533
 534         // make sure the database is aligned
 535         if(st->last_updated.tv_sec)
 536             timeval_align(&st->last_updated, update_every);
 537     }
 538
 539     if(st) {
 540         st->name = NULL;
 541         st->type = NULL;
 542         st->family = NULL;
 543         st->context = NULL;
 544         st->title = NULL;
 545         st->units = NULL;
 546         st->dimensions = NULL;
 547         st->next = NULL;
 548         st->mapped = rrd_memory_mode;
 549         st->variables = NULL;
 550         st->alarms = NULL;
 551     }
 552     else {
 553         st = callocz(1, size);
 554         st->mapped = RRD_MEMORY_MODE_RAM;
 555     }
 556
 557     st->memsize = size;
 558     st->entries = entries;
 559     st->update_every = update_every;
 560
 561     if(st->current_entry >= st->entries) st->current_entry = 0;
 562
 563     strcpy(st->cache_filename, fullfilename);
 564     strcpy(st->magic, RRDSET_MAGIC);
 565
 566     strcpy(st->id, fullid);
 567     st->hash = simple_hash(st->id);
 568
 569     st->cache_dir = cache_dir;
 570
 571     st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 572     st->type       = config_get(st->id, "type", type);
 573     st->family     = config_get(st->id, "family", family?family:st->type);
 574     st->units      = config_get(st->id, "units", units?units:"");
 575
 576     st->context    = config_get(st->id, "context", context?context:st->id);
 577     st->hash_context = simple_hash(st->context);
 578
 579     st->priority = config_get_number(st->id, "priority", priority);
 580     st->enabled = enabled;
 581
 582     st->isdetail = 0;
 583     st->debug = 0;
 584
 585     // if(!strcmp(st->id, "disk_util.dm-0")) {
 586     //     st->debug = 1;
 587     //     error("enabled debugging for '%s'", st->id);
 588     // }
 589     // else error("not enabled debugging for '%s'", st->id);
 590
 591     st->green = NAN;
 592     st->red = NAN;
 593
 594     st->last_collected_time.tv_sec = 0;
 595     st->last_collected_time.tv_usec = 0;
 596     st->counter_done = 0;
 597
 598     st->gap_when_lost_iterations_above = (int) (
 599             config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 600
 601     avl_init_lock(&st->dimensions_index, rrddim_compare);
 602     avl_init_lock(&st->variables_root_index, rrdvar_compare);
 603
 604     pthread_rwlock_init(&st->rwlock, NULL);
 605     rrdhost_rwlock(&localhost);
 606
 607     if(name && *name) rrdset_set_name(st, name);
 608     else rrdset_set_name(st, id);
 609
 610     {
 611         char varvalue[CONFIG_MAX_VALUE + 1];
 612         snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 613         st->title = config_get(st->id, "title", varvalue);
 614     }
 615
 616     st->rrdfamily = rrdfamily_create(st->family);
 617     st->rrdhost = &localhost;
 618
 619     st->next = localhost.rrdset_root;
 620     localhost.rrdset_root = st;
 621
 622     if(health_enabled) {
 623         rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
 624         rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
 625         rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
 626         rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
 627         rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
 628     }
 629
 630     rrdset_index_add(&localhost, st);
 631
 632     rrdsetcalc_link_matching(st);
 633     rrdcalctemplate_link_matching(st);
 634
 635     rrdhost_unlock(&localhost);
 636
 637     return(st);
 638 }
 639
 640 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 641 {
 642     char filename[FILENAME_MAX + 1];
 643     char fullfilename[FILENAME_MAX + 1];
 644
 645     char varname[CONFIG_MAX_NAME + 1];
 646     RRDDIM *rd = NULL;
 647     unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 648
 649     debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 650
 651     rrdset_strncpyz_name(filename, id, FILENAME_MAX);
 652     snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 653     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);
 654     if(rd) {
 655         struct timeval now;
 656         gettimeofday(&now, NULL);
 657
 658         if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 659             errno = 0;
 660             info("Initializing file %s.", fullfilename);
 661             memset(rd, 0, size);
 662         }
 663         else if(rd->memsize != size) {
 664             errno = 0;
 665             error("File %s does not have the desired size. Clearing it.", fullfilename);
 666             memset(rd, 0, size);
 667         }
 668         else if(rd->multiplier != multiplier) {
 669             errno = 0;
 670             error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 671             memset(rd, 0, size);
 672         }
 673         else if(rd->divisor != divisor) {
 674             errno = 0;
 675             error("File %s does not have the same divisor. Clearing it.", fullfilename);
 676             memset(rd, 0, size);
 677         }
 678         else if(rd->algorithm != algorithm) {
 679             errno = 0;
 680             error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 681             memset(rd, 0, size);
 682         }
 683         else if(rd->update_every != st->update_every) {
 684             errno = 0;
 685             error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 686             memset(rd, 0, size);
 687         }
 688         else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 689             errno = 0;
 690             error("File %s is too old. Clearing it.", fullfilename);
 691             memset(rd, 0, size);
 692         }
 693         else if(strcmp(rd->id, id) != 0) {
 694             errno = 0;
 695             error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 696             // munmap(rd, size);
 697             // rd = NULL;
 698             memset(rd, 0, size);
 699         }
 700     }
 701
 702     if(rd) {
 703         // we have a file mapped for rd
 704         rd->mapped = rrd_memory_mode;
 705         rd->flags = 0x00000000;
 706         rd->variables = NULL;
 707         rd->next = NULL;
 708         rd->name = NULL;
 709     }
 710     else {
 711         // if we didn't manage to get a mmap'd dimension, just create one
 712
 713         rd = callocz(1, size);
 714         rd->mapped = RRD_MEMORY_MODE_RAM;
 715     }
 716     rd->memsize = size;
 717
 718     strcpy(rd->magic, RRDDIMENSION_MAGIC);
 719     strcpy(rd->cache_filename, fullfilename);
 720     strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 721     rd->hash = simple_hash(rd->id);
 722
 723     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 724     rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 725
 726     snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 727     rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 728
 729     snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 730     rd->multiplier = config_get_number(st->id, varname, multiplier);
 731
 732     snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 733     rd->divisor = config_get_number(st->id, varname, divisor);
 734     if(!rd->divisor) rd->divisor = 1;
 735
 736     rd->entries = st->entries;
 737     rd->update_every = st->update_every;
 738
 739     // prevent incremental calculation spikes
 740     rd->counter = 0;
 741     rd->updated = 0;
 742     rd->calculated_value = 0;
 743     rd->last_calculated_value = 0;
 744     rd->collected_value = 0;
 745     rd->last_collected_value = 0;
 746     rd->collected_volume = 0;
 747     rd->stored_volume = 0;
 748     rd->last_stored_value = 0;
 749     rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
 750     rd->last_collected_time.tv_sec = 0;
 751     rd->last_collected_time.tv_usec = 0;
 752     rd->rrdset = st;
 753
 754     // append this dimension
 755     pthread_rwlock_wrlock(&st->rwlock);
 756     if(!st->dimensions)
 757         st->dimensions = rd;
 758     else {
 759         RRDDIM *td = st->dimensions;
 760         for(; td->next; td = td->next) ;
 761         td->next = rd;
 762     }
 763
 764     if(health_enabled) {
 765         rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
 766         rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
 767         rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
 768     }
 769
 770     pthread_rwlock_unlock(&st->rwlock);
 771
 772     rrddim_index_add(st, rd);
 773
 774     return(rd);
 775 }
 776
 777 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 778 {
 779     if(unlikely(rd->name && !strcmp(rd->name, name)))
 780         return;
 781
 782     debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
 783
 784     char varname[CONFIG_MAX_NAME + 1];
 785     snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 786     rd->name = config_set_default(st->id, varname, name);
 787
 788     rrddimvar_rename_all(rd);
 789 }
 790
 791 void rrddim_free(RRDSET *st, RRDDIM *rd)
 792 {
 793     debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 794
 795     if(rd == st->dimensions)
 796         st->dimensions = rd->next;
 797     else {
 798         RRDDIM *i;
 799         for (i = st->dimensions; i && i->next != rd; i = i->next) ;
 800
 801         if (i && i->next == rd)
 802             i->next = rd->next;
 803         else
 804             error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
 805     }
 806     rd->next = NULL;
 807
 808     while(rd->variables)
 809         rrddimvar_free(rd->variables);
 810
 811     rrddim_index_del(st, rd);
 812
 813     // free(rd->annotations);
 814     if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 815         debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 816         savememory(rd->cache_filename, rd, rd->memsize);
 817
 818         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 819         munmap(rd, rd->memsize);
 820     }
 821     else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 822         debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 823         munmap(rd, rd->memsize);
 824     }
 825     else {
 826         debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 827         freez(rd);
 828     }
 829 }
 830
 831 void rrdset_free_all(void)
 832 {
 833     info("Freeing all memory...");
 834
 835     rrdhost_rwlock(&localhost);
 836
 837     RRDSET *st;
 838     for(st = localhost.rrdset_root; st ;) {
 839         RRDSET *next = st->next;
 840
 841         pthread_rwlock_wrlock(&st->rwlock);
 842
 843         while(st->variables)
 844             rrdsetvar_free(st->variables);
 845
 846         while(st->alarms)
 847             rrdsetcalc_unlink(st->alarms);
 848
 849         while(st->dimensions)
 850             rrddim_free(st, st->dimensions);
 851
 852         rrdset_index_del(&localhost, st);
 853
 854         st->rrdfamily->use_count--;
 855         if(!st->rrdfamily->use_count)
 856             rrdfamily_free(st->rrdfamily);
 857
 858         pthread_rwlock_unlock(&st->rwlock);
 859
 860         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 861             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 862             savememory(st->cache_filename, st, st->memsize);
 863
 864             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 865             munmap(st, st->memsize);
 866         }
 867         else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 868             debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 869             munmap(st, st->memsize);
 870         }
 871         else
 872             freez(st);
 873
 874         st = next;
 875     }
 876     localhost.rrdset_root = NULL;
 877
 878     rrdhost_unlock(&localhost);
 879
 880     info("Memory cleanup completed...");
 881 }
 882
 883 void rrdset_save_all(void) {
 884     info("Saving database...");
 885
 886     RRDSET *st;
 887     RRDDIM *rd;
 888
 889     rrdhost_rwlock(&localhost);
 890     for(st = localhost.rrdset_root; st ; st = st->next) {
 891         pthread_rwlock_wrlock(&st->rwlock);
 892
 893         if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 894             debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 895             savememory(st->cache_filename, st, st->memsize);
 896         }
 897
 898         for(rd = st->dimensions; rd ; rd = rd->next) {
 899             if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 900                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 901                 savememory(rd->cache_filename, rd, rd->memsize);
 902             }
 903         }
 904
 905         pthread_rwlock_unlock(&st->rwlock);
 906     }
 907     rrdhost_unlock(&localhost);
 908 }
 909
 910
 911 RRDSET *rrdset_find(const char *id)
 912 {
 913     debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 914
 915     RRDSET *st = rrdset_index_find(&localhost, id, 0);
 916     return(st);
 917 }
 918
 919 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 920 {
 921     debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 922
 923     char buf[RRD_ID_LENGTH_MAX + 1];
 924
 925     strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 926     strcat(buf, ".");
 927     int len = (int) strlen(buf);
 928     strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 929
 930     return(rrdset_find(buf));
 931 }
 932
 933 RRDSET *rrdset_find_byname(const char *name)
 934 {
 935     debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 936
 937     RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
 938     return(st);
 939 }
 940
 941 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 942 {
 943     debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 944
 945     return rrddim_index_find(st, id, 0);
 946 }
 947
 948 int rrddim_hide(RRDSET *st, const char *id)
 949 {
 950     debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 951
 952     RRDDIM *rd = rrddim_find(st, id);
 953     if(unlikely(!rd)) {
 954         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 955         return 1;
 956     }
 957
 958     rd->flags |= RRDDIM_FLAG_HIDDEN;
 959     return 0;
 960 }
 961
 962 int rrddim_unhide(RRDSET *st, const char *id)
 963 {
 964     debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 965
 966     RRDDIM *rd = rrddim_find(st, id);
 967     if(unlikely(!rd)) {
 968         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 969         return 1;
 970     }
 971
 972     if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 973     return 0;
 974 }
 975
 976 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 977 {
 978     debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 979
 980     gettimeofday(&rd->last_collected_time, NULL);
 981     rd->collected_value = value;
 982     rd->updated = 1;
 983     rd->counter++;
 984
 985     // 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));
 986
 987     return rd->last_collected_value;
 988 }
 989
 990 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 991 {
 992     RRDDIM *rd = rrddim_find(st, id);
 993     if(unlikely(!rd)) {
 994         error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 995         return 0;
 996     }
 997
 998     return rrddim_set_by_pointer(st, rd, value);
 999 }
1000
1001 void rrdset_next_usec_unfiltered(RRDSET *st, unsigned long long microseconds)
1002 {
1003     if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
1004         // the first entry
1005         microseconds = st->update_every * 1000000ULL;
1006     }
1007     st->usec_since_last_update = microseconds;
1008 }
1009
1010 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
1011 {
1012     struct timeval now;
1013     gettimeofday(&now, NULL);
1014
1015     if(unlikely(!st->last_collected_time.tv_sec)) {
1016         // the first entry
1017         microseconds = st->update_every * 1000000ULL;
1018     }
1019     else if(unlikely(!microseconds)) {
1020         // no dt given by the plugin
1021         microseconds = usec_dt(&now, &st->last_collected_time);
1022     }
1023     else {
1024         // microseconds has the time since the last collection
1025         unsigned long long now_usec = timeval_usec(&now);
1026         unsigned long long last_usec = timeval_usec(&st->last_collected_time);
1027         unsigned long long since_last_usec = usec_dt(&now, &st->last_collected_time);
1028
1029         // verify the microseconds given is good
1030         if(unlikely(microseconds > since_last_usec)) {
1031             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);
1032
1033 #ifdef NETDATA_INTERNAL_CHECKS
1034             if(unlikely(last_usec + microseconds > now_usec + 1000))
1035                 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);
1036 #endif
1037
1038             microseconds = since_last_usec;
1039         }
1040         else if(unlikely(microseconds < since_last_usec * 0.8)) {
1041             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);
1042
1043 #ifdef NETDATA_INTERNAL_CHECKS
1044             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);
1045 #endif
1046             microseconds = since_last_usec;
1047         }
1048     }
1049     debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
1050
1051     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
1052     st->usec_since_last_update = microseconds;
1053 }
1054
1055 unsigned long long rrdset_done(RRDSET *st)
1056 {
1057     if(unlikely(netdata_exit)) return 0;
1058
1059     debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
1060
1061     RRDDIM *rd;
1062
1063     int
1064         pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
1065
1066     char
1067         store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
1068         first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
1069
1070     unsigned int
1071         stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
1072
1073     unsigned long long
1074         last_collect_ut,        // the timestamp in microseconds, of the last collected value
1075         now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
1076         last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
1077         next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
1078         update_every_ut = st->update_every * 1000000ULL; // st->update_every in microseconds
1079
1080     if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 0))
1081         error("Cannot set pthread cancel state to DISABLE.");
1082
1083     // a read lock is OK here
1084     pthread_rwlock_rdlock(&st->rwlock);
1085
1086 /*
1087     // enable the chart, if it was disabled
1088     if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
1089         st->enabled = 1;
1090 */
1091
1092     // check if the chart has a long time to be updated
1093     if(unlikely(st->usec_since_last_update > st->entries * update_every_ut)) {
1094         info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
1095         rrdset_reset(st);
1096         st->usec_since_last_update = update_every_ut;
1097         first_entry = 1;
1098     }
1099     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
1100
1101     // set last_collected_time
1102     if(unlikely(!st->last_collected_time.tv_sec)) {
1103         // it is the first entry
1104         // set the last_collected_time to now
1105         gettimeofday(&st->last_collected_time, NULL);
1106         timeval_align(&st->last_collected_time, st->update_every);
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         timeval_align(&st->last_collected_time, st->update_every);
1150
1151         unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
1152         st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
1153         st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
1154
1155         // the first entry should not be stored
1156         store_this_entry = 0;
1157         first_entry = 1;
1158     }
1159
1160     // these are the 3 variables that will help us in interpolation
1161     // last_stored_ut = the last time we added a value to the storage
1162     // now_collect_ut = the time the current value has been collected
1163     // next_store_ut  = the time of the next interpolation point
1164     last_stored_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
1165     now_collect_ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
1166     next_store_ut  = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
1167
1168     if(unlikely(st->debug)) {
1169         debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
1170         debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
1171         debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1172         debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1173     }
1174
1175     if(unlikely(!st->counter_done)) {
1176         store_this_entry = 0;
1177         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
1178     }
1179     st->counter_done++;
1180
1181     // calculate totals and count the dimensions
1182     int dimensions;
1183     st->collected_total = 0;
1184     for( rd = st->dimensions, dimensions = 0 ; rd ; rd = rd->next, dimensions++ )
1185         if(likely(rd->updated)) st->collected_total += rd->collected_value;
1186
1187     uint32_t storage_flags = SN_EXISTS;
1188
1189     // process all dimensions to calculate their values
1190     // based on the collected figures only
1191     // at this stage we do not interpolate anything
1192     for( rd = st->dimensions ; rd ; rd = rd->next ) {
1193
1194         if(unlikely(!rd->updated)) {
1195             rd->calculated_value = 0;
1196             continue;
1197         }
1198
1199         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
1200             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1201             " collected_value = " COLLECTED_NUMBER_FORMAT
1202             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1203             " calculated_value = " CALCULATED_NUMBER_FORMAT
1204             , st->id, rd->name
1205             , rd->last_collected_value
1206             , rd->collected_value
1207             , rd->last_calculated_value
1208             , rd->calculated_value
1209             );
1210
1211         switch(rd->algorithm) {
1212             case RRDDIM_ABSOLUTE:
1213                 rd->calculated_value = (calculated_number)rd->collected_value
1214                     * (calculated_number)rd->multiplier
1215                     / (calculated_number)rd->divisor;
1216
1217                 if(unlikely(st->debug))
1218                     debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
1219                         CALCULATED_NUMBER_FORMAT " = "
1220                         COLLECTED_NUMBER_FORMAT
1221                         " * " CALCULATED_NUMBER_FORMAT
1222                         " / " CALCULATED_NUMBER_FORMAT
1223                         , st->id, rd->name
1224                         , rd->calculated_value
1225                         , rd->collected_value
1226                         , (calculated_number)rd->multiplier
1227                         , (calculated_number)rd->divisor
1228                         );
1229                 break;
1230
1231             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1232                 if(unlikely(!st->collected_total))
1233                     rd->calculated_value = 0;
1234                 else
1235                     // the percentage of the current value
1236                     // over the total of all dimensions
1237                     rd->calculated_value =
1238                           (calculated_number)100
1239                         * (calculated_number)rd->collected_value
1240                         / (calculated_number)st->collected_total;
1241
1242                 if(unlikely(st->debug))
1243                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
1244                         CALCULATED_NUMBER_FORMAT " = 100"
1245                         " * " COLLECTED_NUMBER_FORMAT
1246                         " / " COLLECTED_NUMBER_FORMAT
1247                         , st->id, rd->name
1248                         , rd->calculated_value
1249                         , rd->collected_value
1250                         , st->collected_total
1251                         );
1252                 break;
1253
1254             case RRDDIM_INCREMENTAL:
1255                 if(unlikely(rd->counter <= 1)) {
1256                     rd->calculated_value = 0;
1257                     continue;
1258                 }
1259
1260                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1261                 // to reset the calculation (it will give zero as the calculation for this second)
1262                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1263                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1264                             , st->name, rd->name
1265                             , rd->last_collected_value
1266                             , rd->collected_value);
1267                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1268                     rd->last_collected_value = rd->collected_value;
1269                 }
1270
1271                 rd->calculated_value +=
1272                       (calculated_number)(rd->collected_value - rd->last_collected_value)
1273                     * (calculated_number)rd->multiplier
1274                     / (calculated_number)rd->divisor;
1275
1276                 if(unlikely(st->debug))
1277                     debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1278                         CALCULATED_NUMBER_FORMAT " = ("
1279                         COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1280                         ")"
1281                         " * " CALCULATED_NUMBER_FORMAT
1282                         " / " CALCULATED_NUMBER_FORMAT
1283                         , st->id, rd->name
1284                         , rd->calculated_value
1285                         , rd->collected_value, rd->last_collected_value
1286                         , (calculated_number)rd->multiplier
1287                         , (calculated_number)rd->divisor
1288                         );
1289                 break;
1290
1291             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1292                 if(unlikely(rd->counter <= 1)) {
1293                     rd->calculated_value = 0;
1294                     continue;
1295                 }
1296
1297                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1298                 // to reset the calculation (it will give zero as the calculation for this second)
1299                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1300                     debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1301                     , st->name, rd->name
1302                     , rd->last_collected_value
1303                     , rd->collected_value);
1304                     if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1305                     rd->last_collected_value = rd->collected_value;
1306                 }
1307
1308                 // the percentage of the current increment
1309                 // over the increment of all dimensions together
1310                 if(unlikely(st->collected_total == st->last_collected_total))
1311                     rd->calculated_value = 0;
1312                 else
1313                     rd->calculated_value =
1314                           (calculated_number)100
1315                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1316                         / (calculated_number)(st->collected_total - st->last_collected_total);
1317
1318                 if(unlikely(st->debug))
1319                     debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1320                         CALCULATED_NUMBER_FORMAT " = 100"
1321                         " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1322                         " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1323                         , st->id, rd->name
1324                         , rd->calculated_value
1325                         , rd->collected_value, rd->last_collected_value
1326                         , st->collected_total, st->last_collected_total
1327                         );
1328                 break;
1329
1330             default:
1331                 // make the default zero, to make sure
1332                 // it gets noticed when we add new types
1333                 rd->calculated_value = 0;
1334
1335                 if(unlikely(st->debug))
1336                     debug(D_RRD_STATS, "%s/%s: CALC "
1337                         CALCULATED_NUMBER_FORMAT " = 0"
1338                         , st->id, rd->name
1339                         , rd->calculated_value
1340                         );
1341                 break;
1342         }
1343
1344         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1345             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1346             " collected_value = " COLLECTED_NUMBER_FORMAT
1347             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1348             " calculated_value = " CALCULATED_NUMBER_FORMAT
1349             , st->id, rd->name
1350             , rd->last_collected_value
1351             , rd->collected_value
1352             , rd->last_calculated_value
1353             , rd->calculated_value
1354             );
1355
1356     }
1357
1358     // at this point we have all the calculated values ready
1359     // it is now time to interpolate values on a second boundary
1360
1361     if(unlikely(now_collect_ut < next_store_ut)) {
1362         // this is collected in the same interpolation point
1363         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
1364 #ifdef NETDATA_INTERNAL_CHECKS
1365         info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
1366 #endif
1367     }
1368
1369     unsigned long long first_ut = last_stored_ut;
1370     long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
1371     if((now_collect_ut % (update_every_ut)) == 0) iterations++;
1372
1373     for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
1374 #ifdef NETDATA_INTERNAL_CHECKS
1375         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); }
1376 #endif
1377
1378         if(unlikely(st->debug)) {
1379             debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
1380             debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
1381         }
1382
1383         st->last_updated.tv_sec = (time_t) (next_store_ut / 1000000ULL);
1384         st->last_updated.tv_usec = 0;
1385
1386         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1387             calculated_number new_value;
1388
1389             switch(rd->algorithm) {
1390                 case RRDDIM_INCREMENTAL:
1391                     new_value = (calculated_number)
1392                         (      rd->calculated_value
1393                             * (calculated_number)(next_store_ut - last_collect_ut)
1394                             / (calculated_number)(now_collect_ut - last_collect_ut)
1395                         );
1396
1397                     if(unlikely(st->debug))
1398                         debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1399                             CALCULATED_NUMBER_FORMAT " = "
1400                             CALCULATED_NUMBER_FORMAT
1401                             " * %llu"
1402                             " / %llu"
1403                             , st->id, rd->name
1404                             , new_value
1405                             , rd->calculated_value
1406                             , (next_store_ut - last_stored_ut)
1407                             , (now_collect_ut - last_stored_ut)
1408                             );
1409
1410                     rd->calculated_value -= new_value;
1411                     new_value += rd->last_calculated_value;
1412                     rd->last_calculated_value = 0;
1413                     new_value /= (calculated_number)st->update_every;
1414
1415                     if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
1416                         if(unlikely(st->debug))
1417                             debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
1418                                 st->id, rd->name
1419                                 , (calculated_number)(next_store_ut - last_stored_ut)
1420                                 );
1421                         new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
1422                     }
1423                     break;
1424
1425                 case RRDDIM_ABSOLUTE:
1426                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1427                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1428                 default:
1429                     if(iterations == 1) {
1430                         // this is the last iteration
1431                         // do not interpolate
1432                         // just show the calculated value
1433
1434                         new_value = rd->calculated_value;
1435                     }
1436                     else {
1437                         // we have missed an update
1438                         // interpolate in the middle values
1439
1440                         new_value = (calculated_number)
1441                             (   (     (rd->calculated_value - rd->last_calculated_value)
1442                                     * (calculated_number)(next_store_ut - last_collect_ut)
1443                                     / (calculated_number)(now_collect_ut - last_collect_ut)
1444                                 )
1445                                 +  rd->last_calculated_value
1446                             );
1447
1448                         if(unlikely(st->debug))
1449                             debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1450                                 CALCULATED_NUMBER_FORMAT " = ((("
1451                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1452                                 " * %llu"
1453                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1454                                 , st->id, rd->name
1455                                 , new_value
1456                                 , rd->calculated_value, rd->last_calculated_value
1457                                 , (next_store_ut - first_ut)
1458                                 , (now_collect_ut - first_ut), rd->last_calculated_value
1459                                 );
1460                     }
1461                     break;
1462             }
1463
1464             if(unlikely(!store_this_entry)) {
1465                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1466                 continue;
1467             }
1468
1469             if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1470                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1471                 rd->last_stored_value = new_value;
1472
1473                 if(unlikely(st->debug))
1474                     debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1475                         CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1476                         , st->id, rd->name
1477                         , st->current_entry
1478                         , unpack_storage_number(rd->values[st->current_entry]), new_value
1479                         );
1480             }
1481             else {
1482                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1483                         , st->id, rd->name
1484                         , st->current_entry
1485                         );
1486                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1487                 rd->last_stored_value = NAN;
1488             }
1489
1490             stored_entries++;
1491
1492             if(unlikely(st->debug)) {
1493                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1494                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1495                 calculated_number accuracy = accuracy_loss(t1, t2);
1496                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1497                         , st->id, rd->name
1498                         , st->current_entry
1499                         , t2
1500                         , get_storage_number_flags(rd->values[st->current_entry])
1501                         , t1
1502                         , accuracy
1503                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1504                         );
1505
1506                 rd->collected_volume += t1;
1507                 rd->stored_volume += t2;
1508                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1509                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1510                         , st->id, rd->name
1511                         , st->current_entry
1512                         , rd->stored_volume
1513                         , rd->collected_volume
1514                         , accuracy
1515                         , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1516                         );
1517
1518             }
1519         }
1520         // reset the storage flags for the next point, if any;
1521         storage_flags = SN_EXISTS;
1522
1523         st->counter++;
1524         st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1525         last_stored_ut = next_store_ut;
1526     }
1527
1528     st->last_collected_total  = st->collected_total;
1529
1530     for( rd = st->dimensions; rd ; rd = rd->next ) {
1531         if(unlikely(!rd->updated)) continue;
1532
1533         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);
1534         rd->last_collected_value = rd->collected_value;
1535
1536         switch(rd->algorithm) {
1537             case RRDDIM_INCREMENTAL:
1538                 if(unlikely(!first_entry)) {
1539                     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);
1540                     rd->last_calculated_value += rd->calculated_value;
1541                 }
1542                 else {
1543                     if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
1544                 }
1545                 break;
1546
1547             case RRDDIM_ABSOLUTE:
1548             case RRDDIM_PCENT_OVER_ROW_TOTAL:
1549             case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1550                 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);
1551                 rd->last_calculated_value = rd->calculated_value;
1552                 break;
1553         }
1554
1555         rd->calculated_value = 0;
1556         rd->collected_value = 0;
1557         rd->updated = 0;
1558
1559         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1560             " last_collected_value = " COLLECTED_NUMBER_FORMAT
1561             " collected_value = " COLLECTED_NUMBER_FORMAT
1562             " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1563             " calculated_value = " CALCULATED_NUMBER_FORMAT
1564             , st->id, rd->name
1565             , rd->last_collected_value
1566             , rd->collected_value
1567             , rd->last_calculated_value
1568             , rd->calculated_value
1569             );
1570     }
1571
1572     // ALL DONE ABOUT THE DATA UPDATE
1573     // --------------------------------------------------------------------
1574
1575 /*
1576     // find if there are any obsolete dimensions (not updated recently)
1577     if(unlikely(rrd_delete_unupdated_dimensions)) {
1578
1579         for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1580             if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1581                 break;
1582
1583         if(unlikely(rd)) {
1584             RRDDIM *last;
1585             // there is dimension to free
1586             // upgrade our read lock to a write lock
1587             pthread_rwlock_unlock(&st->rwlock);
1588             pthread_rwlock_wrlock(&st->rwlock);
1589
1590             for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1591                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1592
1593                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1594                     info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1595
1596                     if(unlikely(!last)) {
1597                         st->dimensions = rd->next;
1598                         rd->next = NULL;
1599                         rrddim_free(st, rd);
1600                         rd = st->dimensions;
1601                         continue;
1602                     }
1603                     else {
1604                         last->next = rd->next;
1605                         rd->next = NULL;
1606                         rrddim_free(st, rd);
1607                         rd = last->next;
1608                         continue;
1609                     }
1610                 }
1611
1612                 last = rd;
1613                 rd = rd->next;
1614             }
1615
1616             if(unlikely(!st->dimensions)) {
1617                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1618                 st->enabled = 0;
1619             }
1620         }
1621     }
1622 */
1623
1624     pthread_rwlock_unlock(&st->rwlock);
1625
1626     if(unlikely(pthread_setcancelstate(pthreadoldcancelstate, NULL) != 0))
1627         error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
1628
1629     return(st->usec_since_last_update);
1630 }