src/rrd.c

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