src/rrd.c

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