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