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 "rrd.h"
  22
  23 #define RRD_DEFAULT_GAP_INTERPOLATIONS 1
  24
  25 // ----------------------------------------------------------------------------
  26 // globals
  27
  28 // if not zero it gives the time (in seconds) to remove un-updated dimensions
  29 // DO NOT ENABLE
  30 // if dimensions are removed, the chart generation will have to run again
  31 int rrd_delete_unupdated_dimensions = 0;
  32
  33 int rrd_update_every = UPDATE_EVERY;
  34 int rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
  35
  36 RRDSET *rrdset_root = NULL;
  37 pthread_rwlock_t rrdset_root_rwlock = PTHREAD_RWLOCK_INITIALIZER;
  38
  39 int rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
  40
  41
  42 // ----------------------------------------------------------------------------
  43 // RRDSET index
  44
  45 static int rrdset_iterator(avl *a) { if(a) {}; return 0; }
  46
  47 static int rrdset_compare(void* a, void* b) {
  48         if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
  49         else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
  50         else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
  51 }
  52
  53 avl_tree rrdset_root_index = {
  54                 NULL,
  55                 rrdset_compare,
  56 #ifndef AVL_WITHOUT_PTHREADS
  57 #ifdef AVL_LOCK_WITH_MUTEX
  58                 PTHREAD_MUTEX_INITIALIZER
  59 #else
  60                 PTHREAD_RWLOCK_INITIALIZER
  61 #endif
  62 #endif
  63 };
  64
  65 #define rrdset_index_add(st) avl_insert(&rrdset_root_index, (avl *)(st))
  66 #define rrdset_index_del(st) avl_remove(&rrdset_root_index, (avl *)(st))
  67
  68 static RRDSET *rrdset_index_find(const char *id, uint32_t hash) {
  69         RRDSET *result = NULL, tmp;
  70         strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
  71         tmp.hash = (hash)?hash:simple_hash(tmp.id);
  72
  73         avl_search(&(rrdset_root_index), (avl *)&tmp, rrdset_iterator, (avl **)&result);
  74         return result;
  75 }
  76
  77 // ----------------------------------------------------------------------------
  78 // RRDSET name index
  79
  80 #define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
  81
  82 static int rrdset_iterator_name(avl *a) { if(a) {}; return 0; }
  83
  84 static int rrdset_compare_name(void* a, void* b) {
  85         RRDSET *A = rrdset_from_avlname(a);
  86         RRDSET *B = rrdset_from_avlname(b);
  87
  88         // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
  89
  90         if(A->hash_name < B->hash_name) return -1;
  91         else if(A->hash_name > B->hash_name) return 1;
  92         else return strcmp(A->name, B->name);
  93 }
  94
  95 avl_tree rrdset_root_index_name = {
  96                 NULL,
  97                 rrdset_compare_name,
  98 #ifndef AVL_WITHOUT_PTHREADS
  99 #ifdef AVL_LOCK_WITH_MUTEX
 100                 PTHREAD_MUTEX_INITIALIZER
 101 #else
 102                 PTHREAD_RWLOCK_INITIALIZER
 103 #endif
 104 #endif
 105 };
 106
 107 int rrdset_index_add_name(RRDSET *st) {
 108         // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
 109         return avl_insert(&rrdset_root_index_name, (avl *)(&st->avlname));
 110 }
 111
 112 #define rrdset_index_del_name(st) avl_remove(&rrdset_root_index_name, (avl *)(&st->avlname))
 113
 114 static RRDSET *rrdset_index_find_name(const char *name, uint32_t hash) {
 115         void *result = NULL;
 116         RRDSET tmp;
 117         tmp.name = name;
 118         tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
 119
 120         // fprintf(stderr, "SEARCHING: %s\n", name);
 121         avl_search(&(rrdset_root_index_name), (avl *)(&(tmp.avlname)), rrdset_iterator_name, (avl **)&result);
 122         if(result) {
 123                 RRDSET *st = rrdset_from_avlname(result);
 124                 if(strcmp(st->magic, RRDSET_MAGIC))
 125                         error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
 126
 127                 // fprintf(stderr, "FOUND: %s\n", name);
 128                 return rrdset_from_avlname(result);
 129         }
 130         // fprintf(stderr, "NOT FOUND: %s\n", name);
 131         return NULL;
 132 }
 133
 134
 135 // ----------------------------------------------------------------------------
 136 // RRDDIM index
 137
 138 static int rrddim_iterator(avl *a) { if(a) {}; return 0; }
 139
 140 static int rrddim_compare(void* a, void* b) {
 141         if(((RRDDIM *)a)->hash < ((RRDDIM *)b)->hash) return -1;
 142         else if(((RRDDIM *)a)->hash > ((RRDDIM *)b)->hash) return 1;
 143         else return strcmp(((RRDDIM *)a)->id, ((RRDDIM *)b)->id);
 144 }
 145
 146 #define rrddim_index_add(st, rd) avl_insert(&((st)->dimensions_index), (avl *)(rd))
 147 #define rrddim_index_del(st,rd ) avl_remove(&((st)->dimensions_index), (avl *)(rd))
 148
 149 static RRDDIM *rrddim_index_find(RRDSET *st, const char *id, uint32_t hash) {
 150         RRDDIM *result = NULL, tmp;
 151         strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
 152         tmp.hash = (hash)?hash:simple_hash(tmp.id);
 153
 154         avl_search(&(st->dimensions_index), (avl *)&tmp, rrddim_iterator, (avl **)&result);
 155         return result;
 156 }
 157
 158 // ----------------------------------------------------------------------------
 159 // chart types
 160
 161 int rrdset_type_id(const char *name)
 162 {
 163         if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0)) return RRDSET_TYPE_AREA;
 164         else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0)) return RRDSET_TYPE_STACKED;
 165         else if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0)) return RRDSET_TYPE_LINE;
 166         return RRDSET_TYPE_LINE;
 167 }
 168
 169 const char *rrdset_type_name(int chart_type)
 170 {
 171         static char line[] = RRDSET_TYPE_LINE_NAME;
 172         static char area[] = RRDSET_TYPE_AREA_NAME;
 173         static char stacked[] = RRDSET_TYPE_STACKED_NAME;
 174
 175         switch(chart_type) {
 176                 case RRDSET_TYPE_LINE:
 177                         return line;
 178
 179                 case RRDSET_TYPE_AREA:
 180                         return area;
 181
 182                 case RRDSET_TYPE_STACKED:
 183                         return stacked;
 184         }
 185         return line;
 186 }
 187
 188 // ----------------------------------------------------------------------------
 189 // load / save
 190
 191 const char *rrd_memory_mode_name(int id)
 192 {
 193         static const char ram[] = RRD_MEMORY_MODE_RAM_NAME;
 194         static const char map[] = RRD_MEMORY_MODE_MAP_NAME;
 195         static const char save[] = RRD_MEMORY_MODE_SAVE_NAME;
 196
 197         switch(id) {
 198                 case RRD_MEMORY_MODE_RAM:
 199                         return ram;
 200
 201                 case RRD_MEMORY_MODE_MAP:
 202                         return map;
 203
 204                 case RRD_MEMORY_MODE_SAVE:
 205                 default:
 206                         return save;
 207         }
 208
 209         return save;
 210 }
 211
 212 int rrd_memory_mode_id(const char *name)
 213 {
 214         if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
 215                 return RRD_MEMORY_MODE_RAM;
 216         else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
 217                 return RRD_MEMORY_MODE_MAP;
 218
 219         return RRD_MEMORY_MODE_SAVE;
 220 }
 221
 222 // ----------------------------------------------------------------------------
 223 // algorithms types
 224
 225 int rrddim_algorithm_id(const char *name)
 226 {
 227         if(strcmp(name, RRDDIM_INCREMENTAL_NAME) == 0)                  return RRDDIM_INCREMENTAL;
 228         if(strcmp(name, RRDDIM_ABSOLUTE_NAME) == 0)                     return RRDDIM_ABSOLUTE;
 229         if(strcmp(name, RRDDIM_PCENT_OVER_ROW_TOTAL_NAME) == 0)                 return RRDDIM_PCENT_OVER_ROW_TOTAL;
 230         if(strcmp(name, RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)        return RRDDIM_PCENT_OVER_DIFF_TOTAL;
 231         return RRDDIM_ABSOLUTE;
 232 }
 233
 234 const char *rrddim_algorithm_name(int chart_type)
 235 {
 236         static char absolute[] = RRDDIM_ABSOLUTE_NAME;
 237         static char incremental[] = RRDDIM_INCREMENTAL_NAME;
 238         static char percentage_of_absolute_row[] = RRDDIM_PCENT_OVER_ROW_TOTAL_NAME;
 239         static char percentage_of_incremental_row[] = RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME;
 240
 241         switch(chart_type) {
 242                 case RRDDIM_ABSOLUTE:
 243                         return absolute;
 244
 245                 case RRDDIM_INCREMENTAL:
 246                         return incremental;
 247
 248                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
 249                         return percentage_of_absolute_row;
 250
 251                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
 252                         return percentage_of_incremental_row;
 253         }
 254         return absolute;
 255 }
 256
 257 // ----------------------------------------------------------------------------
 258 // chart names
 259
 260 char *rrdset_strncpy_name(char *to, const char *from, int length)
 261 {
 262         int i;
 263         for(i = 0; i < length && from[i] ;i++) {
 264                 if(from[i] == '.' || isalpha(from[i]) || isdigit(from[i])) to[i] = from[i];
 265                 else to[i] = '_';
 266         }
 267         if(i < length) to[i] = '\0';
 268         to[length - 1] = '\0';
 269
 270         return to;
 271 }
 272
 273 void rrdset_set_name(RRDSET *st, const char *name)
 274 {
 275         debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
 276
 277         if(st->name) rrdset_index_del_name(st);
 278
 279         char b[CONFIG_MAX_VALUE + 1];
 280         char n[RRD_ID_LENGTH_MAX + 1];
 281
 282         snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
 283         rrdset_strncpy_name(b, n, CONFIG_MAX_VALUE);
 284         st->name = config_get(st->id, "name", b);
 285         st->hash_name = simple_hash(st->name);
 286
 287         rrdset_index_add_name(st);
 288 }
 289
 290 // ----------------------------------------------------------------------------
 291 // cache directory
 292
 293 char *rrdset_cache_dir(const char *id)
 294 {
 295         char *ret = NULL;
 296
 297         static char *cache_dir = NULL;
 298         if(!cache_dir) cache_dir = config_get("global", "cache directory", CACHE_DIR);
 299
 300         char b[FILENAME_MAX + 1];
 301         char n[FILENAME_MAX + 1];
 302         rrdset_strncpy_name(b, id, FILENAME_MAX);
 303
 304         snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
 305         ret = config_get(id, "cache directory", n);
 306
 307         if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
 308                 int r = mkdir(ret, 0775);
 309                 if(r != 0 && errno != EEXIST)
 310                         error("Cannot create directory '%s'", ret);
 311         }
 312
 313         return ret;
 314 }
 315
 316 // ----------------------------------------------------------------------------
 317 // core functions
 318
 319 void rrdset_reset(RRDSET *st)
 320 {
 321         debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
 322
 323         st->last_collected_time.tv_sec = 0;
 324         st->last_collected_time.tv_usec = 0;
 325         st->last_updated.tv_sec = 0;
 326         st->last_updated.tv_usec = 0;
 327         st->current_entry = 0;
 328         st->counter = 0;
 329         st->counter_done = 0;
 330
 331         RRDDIM *rd;
 332         for(rd = st->dimensions; rd ; rd = rd->next) {
 333                 rd->last_collected_time.tv_sec = 0;
 334                 rd->last_collected_time.tv_usec = 0;
 335                 rd->counter = 0;
 336                 bzero(rd->values, rd->entries * sizeof(storage_number));
 337         }
 338 }
 339
 340 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)
 341 {
 342         if(!type || !type[0]) {
 343                 fatal("Cannot create rrd stats without a type.");
 344                 return NULL;
 345         }
 346
 347         if(!id || !id[0]) {
 348                 fatal("Cannot create rrd stats without an id.");
 349                 return NULL;
 350         }
 351
 352         char fullid[RRD_ID_LENGTH_MAX + 1];
 353         char fullfilename[FILENAME_MAX + 1];
 354         RRDSET *st = NULL;
 355
 356         snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
 357
 358         st = rrdset_find(fullid);
 359         if(st) {
 360                 error("Cannot create rrd stats for '%s', it already exists.", fullid);
 361                 return st;
 362         }
 363
 364         long entries = config_get_number(fullid, "history", rrd_default_history_entries);
 365         if(entries < 5) entries = config_set_number(fullid, "history", 5);
 366         if(entries > RRD_HISTORY_ENTRIES_MAX) entries = config_set_number(fullid, "history", RRD_HISTORY_ENTRIES_MAX);
 367
 368         int enabled = config_get_boolean(fullid, "enabled", 1);
 369         if(!enabled) entries = 5;
 370
 371         unsigned long size = sizeof(RRDSET);
 372         char *cache_dir = rrdset_cache_dir(fullid);
 373
 374         debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
 375
 376         snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
 377         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);
 378         if(st) {
 379                 if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
 380                         errno = 0;
 381                         info("Initializing file %s.", fullfilename);
 382                         bzero(st, size);
 383                 }
 384                 else if(strcmp(st->id, fullid) != 0) {
 385                         errno = 0;
 386                         error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
 387                         // munmap(st, size);
 388                         // st = NULL;
 389                         bzero(st, size);
 390                 }
 391                 else if(st->memsize != size || st->entries != entries) {
 392                         errno = 0;
 393                         error("File %s does not have the desired size. Clearing it.", fullfilename);
 394                         bzero(st, size);
 395                 }
 396                 else if(st->update_every != update_every) {
 397                         errno = 0;
 398                         error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
 399                         bzero(st, size);
 400                 }
 401                 else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
 402                         errno = 0;
 403                         error("File %s is too old. Clearing it.", fullfilename);
 404                         bzero(st, size);
 405                 }
 406         }
 407
 408         if(st) {
 409                 st->name = NULL;
 410                 st->type = NULL;
 411                 st->family = NULL;
 412                 st->context = NULL;
 413                 st->title = NULL;
 414                 st->units = NULL;
 415                 st->dimensions = NULL;
 416                 st->next = NULL;
 417                 st->mapped = rrd_memory_mode;
 418         }
 419         else {
 420                 st = calloc(1, size);
 421                 if(!st) {
 422                         fatal("Cannot allocate memory for RRD_STATS %s.%s", type, id);
 423                         return NULL;
 424                 }
 425                 st->mapped = RRD_MEMORY_MODE_RAM;
 426         }
 427         st->memsize = size;
 428         st->entries = entries;
 429         st->update_every = update_every;
 430
 431         strcpy(st->cache_filename, fullfilename);
 432         strcpy(st->magic, RRDSET_MAGIC);
 433
 434         strcpy(st->id, fullid);
 435         st->hash = simple_hash(st->id);
 436
 437         st->cache_dir = cache_dir;
 438
 439         st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
 440         st->type       = config_get(st->id, "type", type);
 441         st->family     = config_get(st->id, "family", family?family:st->type);
 442         st->context    = config_get(st->id, "context", context?context:st->id);
 443         st->units      = config_get(st->id, "units", units?units:"");
 444
 445         st->priority = config_get_number(st->id, "priority", priority);
 446         st->enabled = enabled;
 447
 448         st->isdetail = 0;
 449         st->debug = 0;
 450
 451         st->last_collected_time.tv_sec = 0;
 452         st->last_collected_time.tv_usec = 0;
 453         st->counter_done = 0;
 454
 455         st->gap_when_lost_iterations_above = (int) (
 456                         config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
 457
 458         avl_init(&st->dimensions_index, rrddim_compare);
 459
 460         pthread_rwlock_init(&st->rwlock, NULL);
 461         pthread_rwlock_wrlock(&rrdset_root_rwlock);
 462
 463         if(name && *name) rrdset_set_name(st, name);
 464         else rrdset_set_name(st, id);
 465
 466         {
 467                 char varvalue[CONFIG_MAX_VALUE + 1];
 468                 snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
 469                 st->title = config_get(st->id, "title", varvalue);
 470         }
 471
 472         st->next = rrdset_root;
 473         rrdset_root = st;
 474
 475         rrdset_index_add(st);
 476
 477         pthread_rwlock_unlock(&rrdset_root_rwlock);
 478
 479         return(st);
 480 }
 481
 482 RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
 483 {
 484         char filename[FILENAME_MAX + 1];
 485         char fullfilename[FILENAME_MAX + 1];
 486
 487         char varname[CONFIG_MAX_NAME + 1];
 488         RRDDIM *rd = NULL;
 489         unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
 490
 491         debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
 492
 493         rrdset_strncpy_name(filename, id, FILENAME_MAX);
 494         snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
 495         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);
 496         if(rd) {
 497                 struct timeval now;
 498                 gettimeofday(&now, NULL);
 499
 500                 if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
 501                         errno = 0;
 502                         info("Initializing file %s.", fullfilename);
 503                         bzero(rd, size);
 504                 }
 505                 else if(rd->memsize != size) {
 506                         errno = 0;
 507                         error("File %s does not have the desired size. Clearing it.", fullfilename);
 508                         bzero(rd, size);
 509                 }
 510                 else if(rd->multiplier != multiplier) {
 511                         errno = 0;
 512                         error("File %s does not have the same multiplier. Clearing it.", fullfilename);
 513                         bzero(rd, size);
 514                 }
 515                 else if(rd->divisor != divisor) {
 516                         errno = 0;
 517                         error("File %s does not have the same divisor. Clearing it.", fullfilename);
 518                         bzero(rd, size);
 519                 }
 520                 else if(rd->algorithm != algorithm) {
 521                         errno = 0;
 522                         error("File %s does not have the same algorithm. Clearing it.", fullfilename);
 523                         bzero(rd, size);
 524                 }
 525                 else if(rd->update_every != st->update_every) {
 526                         errno = 0;
 527                         error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
 528                         bzero(rd, size);
 529                 }
 530                 else if(usecdiff(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
 531                         errno = 0;
 532                         error("File %s is too old. Clearing it.", fullfilename);
 533                         bzero(rd, size);
 534                 }
 535                 else if(strcmp(rd->id, id) != 0) {
 536                         errno = 0;
 537                         error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
 538                         // munmap(rd, size);
 539                         // rd = NULL;
 540                         bzero(rd, size);
 541                 }
 542         }
 543
 544         if(rd) {
 545                 // we have a file mapped for rd
 546                 rd->mapped = rrd_memory_mode;
 547                 rd->flags = 0x00000000;
 548                 rd->next = NULL;
 549                 rd->name = NULL;
 550         }
 551         else {
 552                 // if we didn't manage to get a mmap'd dimension, just create one
 553
 554                 rd = calloc(1, size);
 555                 if(!rd) {
 556                         fatal("Cannot allocate RRD_DIMENSION %s/%s.", st->id, id);
 557                         return NULL;
 558                 }
 559
 560                 rd->mapped = RRD_MEMORY_MODE_RAM;
 561         }
 562         rd->memsize = size;
 563
 564         strcpy(rd->magic, RRDDIMENSION_MAGIC);
 565         strcpy(rd->cache_filename, fullfilename);
 566         strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
 567         rd->hash = simple_hash(rd->id);
 568
 569         snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 570         rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
 571
 572         snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
 573         rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
 574
 575         snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
 576         rd->multiplier = config_get_number(st->id, varname, multiplier);
 577
 578         snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
 579         rd->divisor = config_get_number(st->id, varname, divisor);
 580         if(!rd->divisor) rd->divisor = 1;
 581
 582         rd->entries = st->entries;
 583         rd->update_every = st->update_every;
 584
 585         // prevent incremental calculation spikes
 586         rd->counter = 0;
 587
 588         // append this dimension
 589         pthread_rwlock_wrlock(&st->rwlock);
 590         if(!st->dimensions)
 591                 st->dimensions = rd;
 592         else {
 593                 RRDDIM *td = st->dimensions;
 594                 for(; td->next; td = td->next) ;
 595                 td->next = rd;
 596         }
 597         pthread_rwlock_unlock(&st->rwlock);
 598
 599         rrddim_index_add(st, rd);
 600
 601         return(rd);
 602 }
 603
 604 void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
 605 {
 606         debug(D_RRD_CALLS, "rrddim_set_name() %s.%s", st->name, rd->name);
 607
 608         char varname[CONFIG_MAX_NAME + 1];
 609         snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
 610         config_set_default(st->id, varname, name);
 611 }
 612
 613 void rrddim_free(RRDSET *st, RRDDIM *rd)
 614 {
 615         debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
 616
 617         RRDDIM *i, *last = NULL;
 618         for(i = st->dimensions; i && i != rd ; i = i->next) last = i;
 619
 620         if(!i) {
 621                 error("Request to free dimension %s.%s but it is not linked.", st->id, rd->name);
 622                 return;
 623         }
 624
 625         if(last) last->next = rd->next;
 626         else st->dimensions = rd->next;
 627         rd->next = NULL;
 628
 629         rrddim_index_del(st, rd);
 630
 631         // free(rd->annotations);
 632         if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
 633                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 634                 savememory(rd->cache_filename, rd, rd->memsize);
 635
 636                 debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 637                 munmap(rd, rd->memsize);
 638         }
 639         else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
 640                 debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
 641                 munmap(rd, rd->memsize);
 642         }
 643         else {
 644                 debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
 645                 free(rd);
 646         }
 647 }
 648
 649 void rrdset_free_all(void)
 650 {
 651         info("Freeing all memory...");
 652
 653         RRDSET *st;
 654         for(st = rrdset_root; st ;) {
 655                 RRDSET *next = st->next;
 656
 657                 while(st->dimensions)
 658                         rrddim_free(st, st->dimensions);
 659
 660                 rrdset_index_del(st);
 661
 662                 if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 663                         debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 664                         savememory(st->cache_filename, st, st->memsize);
 665
 666                         debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 667                         munmap(st, st->memsize);
 668                 }
 669                 else if(st->mapped == RRD_MEMORY_MODE_MAP) {
 670                         debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
 671                         munmap(st, st->memsize);
 672                 }
 673                 else
 674                         free(st);
 675
 676                 st = next;
 677         }
 678         rrdset_root = NULL;
 679
 680         info("Memory cleanup completed...");
 681 }
 682
 683 void rrdset_save_all(void)
 684 {
 685         debug(D_RRD_CALLS, "rrdset_save_all()");
 686
 687         // let it log a few error messages
 688         error_log_limit_reset();
 689
 690         RRDSET *st;
 691         RRDDIM *rd;
 692
 693         pthread_rwlock_wrlock(&rrdset_root_rwlock);
 694         for(st = rrdset_root; st ; st = st->next) {
 695                 pthread_rwlock_wrlock(&st->rwlock);
 696
 697                 if(st->mapped == RRD_MEMORY_MODE_SAVE) {
 698                         debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
 699                         savememory(st->cache_filename, st, st->memsize);
 700                 }
 701
 702                 for(rd = st->dimensions; rd ; rd = rd->next) {
 703                         if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
 704                                 debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
 705                                 savememory(rd->cache_filename, rd, rd->memsize);
 706                         }
 707                 }
 708
 709                 pthread_rwlock_unlock(&st->rwlock);
 710         }
 711         pthread_rwlock_unlock(&rrdset_root_rwlock);
 712 }
 713
 714
 715 RRDSET *rrdset_find(const char *id)
 716 {
 717         debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
 718
 719         RRDSET *st = rrdset_index_find(id, 0);
 720         return(st);
 721 }
 722
 723 RRDSET *rrdset_find_bytype(const char *type, const char *id)
 724 {
 725         debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
 726
 727         char buf[RRD_ID_LENGTH_MAX + 1];
 728
 729         strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
 730         strcat(buf, ".");
 731         int len = (int) strlen(buf);
 732         strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
 733
 734         return(rrdset_find(buf));
 735 }
 736
 737 RRDSET *rrdset_find_byname(const char *name)
 738 {
 739         debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
 740
 741         RRDSET *st = rrdset_index_find_name(name, 0);
 742         return(st);
 743 }
 744
 745 RRDDIM *rrddim_find(RRDSET *st, const char *id)
 746 {
 747         debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
 748
 749         return rrddim_index_find(st, id, 0);
 750 }
 751
 752 int rrddim_hide(RRDSET *st, const char *id)
 753 {
 754         debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
 755
 756         RRDDIM *rd = rrddim_find(st, id);
 757         if(unlikely(!rd)) {
 758                 error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 759                 return 1;
 760         }
 761
 762         rd->flags |= RRDDIM_FLAG_HIDDEN;
 763         return 0;
 764 }
 765
 766 int rrddim_unhide(RRDSET *st, const char *id)
 767 {
 768         debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
 769
 770         RRDDIM *rd = rrddim_find(st, id);
 771         if(unlikely(!rd)) {
 772                 error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 773                 return 1;
 774         }
 775
 776         if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
 777         return 0;
 778 }
 779
 780 collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
 781 {
 782         debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
 783
 784         gettimeofday(&rd->last_collected_time, NULL);
 785         rd->collected_value = value;
 786         rd->updated = 1;
 787         rd->counter++;
 788
 789         return rd->last_collected_value;
 790 }
 791
 792 collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
 793 {
 794         RRDDIM *rd = rrddim_find(st, id);
 795         if(unlikely(!rd)) {
 796                 error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
 797                 return 0;
 798         }
 799
 800         return rrddim_set_by_pointer(st, rd, value);
 801 }
 802
 803 void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
 804 {
 805         if(!microseconds) rrdset_next(st);
 806         else {
 807                 debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
 808
 809                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
 810                 st->usec_since_last_update = microseconds;
 811         }
 812 }
 813
 814 void rrdset_next(RRDSET *st)
 815 {
 816         unsigned long long microseconds = 0;
 817
 818         if(likely(st->last_collected_time.tv_sec)) {
 819                 struct timeval now;
 820                 gettimeofday(&now, NULL);
 821                 microseconds = usecdiff(&now, &st->last_collected_time);
 822         }
 823         // prevent infinite loop
 824         else microseconds = st->update_every * 1000000ULL;
 825
 826         rrdset_next_usec(st, microseconds);
 827 }
 828
 829 void rrdset_next_plugins(RRDSET *st)
 830 {
 831         rrdset_next(st);
 832 }
 833
 834 unsigned long long rrdset_done(RRDSET *st)
 835 {
 836         debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
 837
 838         RRDDIM *rd, *last;
 839         int oldstate, store_this_entry = 1, first_entry = 0;
 840         unsigned long long last_ut, now_ut, next_ut, stored_entries = 0;
 841
 842         if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate) != 0))
 843                 error("Cannot set pthread cancel state to DISABLE.");
 844
 845         // a read lock is OK here
 846         pthread_rwlock_rdlock(&st->rwlock);
 847
 848         // enable the chart, if it was disabled
 849         if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
 850                 st->enabled = 1;
 851
 852         // check if the chart has a long time to be updated
 853         if(unlikely(st->usec_since_last_update > st->entries * st->update_every * 1000000ULL)) {
 854                 info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
 855                 rrdset_reset(st);
 856                 st->usec_since_last_update = st->update_every * 1000000ULL;
 857                 first_entry = 1;
 858         }
 859         if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
 860
 861         // set last_collected_time
 862         if(unlikely(!st->last_collected_time.tv_sec)) {
 863                 // it is the first entry
 864                 // set the last_collected_time to now
 865                 gettimeofday(&st->last_collected_time, NULL);
 866
 867                 // the first entry should not be stored
 868                 store_this_entry = 0;
 869                 first_entry = 1;
 870
 871                 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);
 872         }
 873         else {
 874                 // it is not the first entry
 875                 // calculate the proper last_collected_time, using usec_since_last_update
 876                 unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec + st->usec_since_last_update;
 877                 st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
 878                 st->last_collected_time.tv_usec = (useconds_t) (ut % 1000000ULL);
 879         }
 880
 881         // if this set has not been updated in the past
 882         // we fake the last_update time to be = now - usec_since_last_update
 883         if(unlikely(!st->last_updated.tv_sec)) {
 884                 // it has never been updated before
 885                 // set a fake last_updated, in the past using usec_since_last_update
 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                 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);
 895         }
 896
 897         // check if we will re-write the entire data set
 898         if(unlikely(usecdiff(&st->last_collected_time, &st->last_updated) > st->update_every * st->entries * 1000000ULL)) {
 899                 info("%s: too old data (last updated at %u.%u, last collected at %u.%u). 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);
 900                 rrdset_reset(st);
 901
 902                 st->usec_since_last_update = st->update_every * 1000000ULL;
 903
 904                 gettimeofday(&st->last_collected_time, NULL);
 905
 906                 unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
 907                 st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
 908                 st->last_updated.tv_usec = (useconds_t) (ut % 1000000ULL);
 909
 910                 // the first entry should not be stored
 911                 store_this_entry = 0;
 912                 first_entry = 1;
 913         }
 914
 915         // these are the 3 variables that will help us in interpolation
 916         // last_ut = the last time we added a value to the storage
 917         //  now_ut = the time the current value is taken at
 918         // next_ut = the time of the next interpolation point
 919         last_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
 920         now_ut  = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
 921         next_ut = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
 922
 923         if(unlikely(!first_entry && now_ut < next_ut)) {
 924                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
 925         }
 926
 927         if(unlikely(st->debug)) {
 928                 debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
 929                 debug(D_RRD_STATS, "%s: now  ut = %0.3Lf (current update time)", st->name, (long double)now_ut/1000000.0);
 930                 debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
 931         }
 932
 933         if(unlikely(!st->counter_done)) {
 934                 store_this_entry = 0;
 935                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
 936         }
 937         st->counter_done++;
 938
 939         // calculate totals and count the dimensions
 940         int dimensions;
 941         st->collected_total = 0;
 942         for( rd = st->dimensions, dimensions = 0 ; likely(rd) ; rd = rd->next, dimensions++ )
 943                 st->collected_total += rd->collected_value;
 944
 945         uint32_t storage_flags = SN_EXISTS;
 946
 947         // process all dimensions to calculate their values
 948         // based on the collected figures only
 949         // at this stage we do not interpolate anything
 950         for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
 951
 952                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
 953                         " last_collected_value = " COLLECTED_NUMBER_FORMAT
 954                         " collected_value = " COLLECTED_NUMBER_FORMAT
 955                         " last_calculated_value = " CALCULATED_NUMBER_FORMAT
 956                         " calculated_value = " CALCULATED_NUMBER_FORMAT
 957                         , st->id, rd->name
 958                         , rd->last_collected_value
 959                         , rd->collected_value
 960                         , rd->last_calculated_value
 961                         , rd->calculated_value
 962                         );
 963
 964                 switch(rd->algorithm) {
 965                 case RRDDIM_ABSOLUTE:
 966                         rd->calculated_value = (calculated_number)rd->collected_value
 967                                 * (calculated_number)rd->multiplier
 968                                 / (calculated_number)rd->divisor;
 969
 970                         if(unlikely(st->debug))
 971                                 debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
 972                                         CALCULATED_NUMBER_FORMAT " = "
 973                                         COLLECTED_NUMBER_FORMAT
 974                                         " * " CALCULATED_NUMBER_FORMAT
 975                                         " / " CALCULATED_NUMBER_FORMAT
 976                                         , st->id, rd->name
 977                                         , rd->calculated_value
 978                                         , rd->collected_value
 979                                         , (calculated_number)rd->multiplier
 980                                         , (calculated_number)rd->divisor
 981                                         );
 982                         break;
 983
 984                         case RRDDIM_PCENT_OVER_ROW_TOTAL:
 985                                 if(unlikely(!st->collected_total)) rd->calculated_value = 0;
 986                                 else
 987                                 // the percentage of the current value
 988                                 // over the total of all dimensions
 989                                 rd->calculated_value =
 990                                           (calculated_number)100
 991                                         * (calculated_number)rd->collected_value
 992                                         / (calculated_number)st->collected_total;
 993
 994                                 if(unlikely(st->debug))
 995                                         debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
 996                                                 CALCULATED_NUMBER_FORMAT " = 100"
 997                                                 " * " COLLECTED_NUMBER_FORMAT
 998                                                 " / " COLLECTED_NUMBER_FORMAT
 999                                                 , st->id, rd->name
1000                                                 , rd->calculated_value
1001                                                 , rd->collected_value
1002                                                 , st->collected_total
1003                                                 );
1004                                 break;
1005
1006                         case RRDDIM_INCREMENTAL:
1007                                 if(unlikely(!rd->updated || rd->counter <= 1)) {
1008                                         rd->calculated_value = 0;
1009                                         continue;
1010                                 }
1011
1012                                 // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
1013                                 // to reset the calculation (it will give zero as the calculation for this second)
1014                                 if(unlikely(rd->last_collected_value > rd->collected_value)) {
1015                                         debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
1016                                                         , st->name, rd->name
1017                                                         , rd->last_collected_value
1018                                                         , rd->collected_value);
1019                                         if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
1020                                         rd->last_collected_value = rd->collected_value;
1021                                 }
1022
1023                                 rd->calculated_value = (calculated_number)(rd->collected_value - rd->last_collected_value)
1024                                         * (calculated_number)rd->multiplier
1025                                         / (calculated_number)rd->divisor;
1026
1027                                 if(unlikely(st->debug))
1028                                         debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
1029                                                 CALCULATED_NUMBER_FORMAT " = ("
1030                                                 COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
1031                                                 ")"
1032                                                 " * " CALCULATED_NUMBER_FORMAT
1033                                                 " / " CALCULATED_NUMBER_FORMAT
1034                                                 , st->id, rd->name
1035                                                 , rd->calculated_value
1036                                                 , rd->collected_value, rd->last_collected_value
1037                                                 , (calculated_number)rd->multiplier
1038                                                 , (calculated_number)rd->divisor
1039                                                 );
1040                                 break;
1041
1042                         case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1043                                 if(unlikely(!rd->updated || rd->counter <= 1)) {
1044                                         rd->calculated_value = 0;
1045                                         continue;
1046                                 }
1047
1048                                 // the percentage of the current increment
1049                                 // over the increment of all dimensions together
1050                                 if(unlikely(st->collected_total == st->last_collected_total)) rd->calculated_value = rd->last_calculated_value;
1051                                 else rd->calculated_value =
1052                                           (calculated_number)100
1053                                         * (calculated_number)(rd->collected_value - rd->last_collected_value)
1054                                         / (calculated_number)(st->collected_total  - st->last_collected_total);
1055
1056                                 if(unlikely(st->debug))
1057                                         debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
1058                                                 CALCULATED_NUMBER_FORMAT " = 100"
1059                                                 " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1060                                                 " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
1061                                                 , st->id, rd->name
1062                                                 , rd->calculated_value
1063                                                 , rd->collected_value, rd->last_collected_value
1064                                                 , st->collected_total, st->last_collected_total
1065                                                 );
1066                                 break;
1067
1068                         default:
1069                                 // make the default zero, to make sure
1070                                 // it gets noticed when we add new types
1071                                 rd->calculated_value = 0;
1072
1073                                 if(unlikely(st->debug))
1074                                         debug(D_RRD_STATS, "%s/%s: CALC "
1075                                                 CALCULATED_NUMBER_FORMAT " = 0"
1076                                                 , st->id, rd->name
1077                                                 , rd->calculated_value
1078                                                 );
1079                                 break;
1080                 }
1081
1082                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
1083                         " last_collected_value = " COLLECTED_NUMBER_FORMAT
1084                         " collected_value = " COLLECTED_NUMBER_FORMAT
1085                         " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1086                         " calculated_value = " CALCULATED_NUMBER_FORMAT
1087                         , st->id, rd->name
1088                         , rd->last_collected_value
1089                         , rd->collected_value
1090                         , rd->last_calculated_value
1091                         , rd->calculated_value
1092                         );
1093
1094         }
1095
1096         // at this point we have all the calculated values ready
1097         // it is now time to interpolate values on a second boundary
1098
1099         unsigned long long first_ut = last_ut;
1100         long long iterations = (now_ut - last_ut) / (st->update_every * 1000000ULL);
1101         if((now_ut % (st->update_every * 1000000ULL)) == 0) iterations++;
1102
1103         for( ; likely(next_ut <= now_ut) ; next_ut += st->update_every * 1000000ULL, iterations-- ) {
1104 #ifdef NETDATA_INTERNAL_CHECKS
1105                 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); }
1106 #endif
1107
1108                 if(unlikely(st->debug)) {
1109                         debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
1110                         debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
1111                 }
1112
1113                 st->last_updated.tv_sec = (time_t) (next_ut / 1000000ULL);
1114                 st->last_updated.tv_usec = 0;
1115
1116                 for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
1117                         calculated_number new_value;
1118
1119                         switch(rd->algorithm) {
1120                                 case RRDDIM_INCREMENTAL:
1121                                         new_value = (calculated_number)
1122                                                 (          rd->calculated_value
1123                                                         * (calculated_number)(next_ut - last_ut)
1124                                                         / (calculated_number)(now_ut - last_ut)
1125                                                 );
1126
1127                                         if(unlikely(st->debug))
1128                                                 debug(D_RRD_STATS, "%s/%s: CALC2 INC "
1129                                                         CALCULATED_NUMBER_FORMAT " = "
1130                                                         CALCULATED_NUMBER_FORMAT
1131                                                         " * %llu"
1132                                                         " / %llu"
1133                                                         , st->id, rd->name
1134                                                         , new_value
1135                                                         , rd->calculated_value
1136                                                         , (next_ut - last_ut)
1137                                                         , (now_ut - last_ut)
1138                                                         );
1139
1140                                         rd->calculated_value -= new_value;
1141                                         new_value += rd->last_calculated_value;
1142                                         rd->last_calculated_value = 0;
1143                                         new_value /= (calculated_number)st->update_every;
1144                                         break;
1145
1146                                 case RRDDIM_ABSOLUTE:
1147                                 case RRDDIM_PCENT_OVER_ROW_TOTAL:
1148                                 case RRDDIM_PCENT_OVER_DIFF_TOTAL:
1149                                 default:
1150                                         if(iterations == 1) {
1151                                                 // this is the last iteration
1152                                                 // do not interpolate
1153                                                 // just show the calculated value
1154
1155                                                 new_value = rd->calculated_value;
1156                                         }
1157                                         else {
1158                                                 // we have missed an update
1159                                                 // interpolate in the middle values
1160
1161                                                 new_value = (calculated_number)
1162                                                         (       (         (rd->calculated_value - rd->last_calculated_value)
1163                                                                         * (calculated_number)(next_ut - first_ut)
1164                                                                         / (calculated_number)(now_ut - first_ut)
1165                                                                 )
1166                                                                 +  rd->last_calculated_value
1167                                                         );
1168
1169                                                 if(unlikely(st->debug))
1170                                                         debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
1171                                                                 CALCULATED_NUMBER_FORMAT " = ((("
1172                                                                 "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
1173                                                                 " * %llu"
1174                                                                 " / %llu) + " CALCULATED_NUMBER_FORMAT
1175                                                                 , st->id, rd->name
1176                                                                 , new_value
1177                                                                 , rd->calculated_value, rd->last_calculated_value
1178                                                                 , (next_ut - first_ut)
1179                                                                 , (now_ut - first_ut), rd->last_calculated_value
1180                                                                 );
1181
1182                                                 // this is wrong
1183                                                 // it fades the value towards the target
1184                                                 // while we know the calculated value is different
1185                                                 // if(likely(next_ut + st->update_every * 1000000ULL > now_ut)) rd->calculated_value = new_value;
1186                                         }
1187                                         break;
1188                         }
1189
1190                         if(unlikely(!store_this_entry)) {
1191                                 store_this_entry = 1;
1192                                 continue;
1193                         }
1194
1195                         if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
1196                                 rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
1197
1198                                 if(unlikely(st->debug))
1199                                         debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
1200                                                 CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
1201                                                 , st->id, rd->name
1202                                                 , st->current_entry
1203                                                 , unpack_storage_number(rd->values[st->current_entry]), new_value
1204                                                 );
1205                         }
1206                         else {
1207                                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
1208                                                 , st->id, rd->name
1209                                                 , st->current_entry
1210                                                 );
1211                                 rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
1212                         }
1213
1214                         stored_entries++;
1215
1216                         if(unlikely(st->debug)) {
1217                                 calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
1218                                 calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
1219                                 calculated_number accuracy = accuracy_loss(t1, t2);
1220                                 debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
1221                                                 , st->id, rd->name
1222                                                 , st->current_entry
1223                                                 , t2
1224                                                 , get_storage_number_flags(rd->values[st->current_entry])
1225                                                 , t1
1226                                                 , accuracy
1227                                                 , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1228                                                 );
1229
1230                                 rd->collected_volume += t1;
1231                                 rd->stored_volume += t2;
1232                                 accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
1233                                 debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
1234                                                 , st->id, rd->name
1235                                                 , st->current_entry
1236                                                 , rd->stored_volume
1237                                                 , rd->collected_volume
1238                                                 , accuracy
1239                                                 , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
1240                                                 );
1241
1242                         }
1243                 }
1244                 // reset the storage flags for the next point, if any;
1245                 storage_flags = SN_EXISTS;
1246
1247                 st->counter++;
1248                 st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
1249                 last_ut = next_ut;
1250         }
1251
1252         // align next interpolation to last collection point
1253         if(likely(stored_entries || !store_this_entry)) {
1254                 st->last_updated.tv_sec = st->last_collected_time.tv_sec;
1255                 st->last_updated.tv_usec = st->last_collected_time.tv_usec;
1256         }
1257
1258         for( rd = st->dimensions; likely(rd) ; rd = rd->next ) {
1259                 if(unlikely(!rd->updated)) continue;
1260
1261                 if(likely(stored_entries || !store_this_entry)) {
1262                         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);
1263                         rd->last_collected_value = rd->collected_value;
1264
1265                         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);
1266                         rd->last_calculated_value = rd->calculated_value;
1267                 }
1268
1269                 rd->calculated_value = 0;
1270                 rd->collected_value = 0;
1271                 rd->updated = 0;
1272
1273                 if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
1274                         " last_collected_value = " COLLECTED_NUMBER_FORMAT
1275                         " collected_value = " COLLECTED_NUMBER_FORMAT
1276                         " last_calculated_value = " CALCULATED_NUMBER_FORMAT
1277                         " calculated_value = " CALCULATED_NUMBER_FORMAT
1278                         , st->id, rd->name
1279                         , rd->last_collected_value
1280                         , rd->collected_value
1281                         , rd->last_calculated_value
1282                         , rd->calculated_value
1283                         );
1284         }
1285         st->last_collected_total  = st->collected_total;
1286
1287         // ALL DONE ABOUT THE DATA UPDATE
1288         // --------------------------------------------------------------------
1289
1290         // find if there are any obsolete dimensions (not updated recently)
1291         if(unlikely(rrd_delete_unupdated_dimensions)) {
1292
1293                 for( rd = st->dimensions; likely(rd) ; rd = rd->next )
1294                         if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
1295                                 break;
1296
1297                 if(unlikely(rd)) {
1298                         // there is dimension to free
1299                         // upgrade our read lock to a write lock
1300                         pthread_rwlock_unlock(&st->rwlock);
1301                         pthread_rwlock_wrlock(&st->rwlock);
1302
1303                         for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
1304                                 // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
1305
1306                                 if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
1307                                         info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
1308
1309                                         if(unlikely(!last)) {
1310                                                 st->dimensions = rd->next;
1311                                                 rd->next = NULL;
1312                                                 rrddim_free(st, rd);
1313                                                 rd = st->dimensions;
1314                                                 continue;
1315                                         }
1316                                         else {
1317                                                 last->next = rd->next;
1318                                                 rd->next = NULL;
1319                                                 rrddim_free(st, rd);
1320                                                 rd = last->next;
1321                                                 continue;
1322                                         }
1323                                 }
1324
1325                                 last = rd;
1326                                 rd = rd->next;
1327                         }
1328
1329                         if(unlikely(!st->dimensions)) {
1330                                 info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
1331                                 st->enabled = 0;
1332                         }
1333                 }
1334         }
1335
1336         pthread_rwlock_unlock(&st->rwlock);
1337
1338         if(unlikely(pthread_setcancelstate(oldstate, NULL) != 0))
1339                 error("Cannot set pthread cancel state to RESTORE (%d).", oldstate);
1340
1341         return(st->usec_since_last_update);
1342 }