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