]> arthur.barton.de Git - netdata.git/blobdiff - src/rrd.c
Fix compiler warnings for FreeBSD plugin
[netdata.git] / src / rrd.c
index f3c6f260ecbee02c504da21a8bc3c997300becf4..a9ff6243db06989c458a9ecf7f0b5480006d4f60 100644 (file)
--- a/src/rrd.c
+++ b/src/rrd.c
+#define NETDATA_RRD_INTERNALS 1
 #include "common.h"
 
-#define RRD_DEFAULT_GAP_INTERPOLATIONS 1
-
 // ----------------------------------------------------------------------------
 // globals
 
+/*
 // if not zero it gives the time (in seconds) to remove un-updated dimensions
 // DO NOT ENABLE
 // if dimensions are removed, the chart generation will have to run again
 int rrd_delete_unupdated_dimensions = 0;
+*/
 
-int rrd_update_every = UPDATE_EVERY;
-int rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
-int rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
+int default_rrd_update_every = UPDATE_EVERY;
+int default_rrd_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
+RRD_MEMORY_MODE default_rrd_memory_mode = RRD_MEMORY_MODE_SAVE;
 
-static int rrdset_compare(void* a, void* b);
-static int rrdset_compare_name(void* a, void* b);
-static int rrdcontext_compare(void* a, void* b);
 
 // ----------------------------------------------------------------------------
-// RRDHOST
-
-RRDHOST localhost = {
-               .hostname = "localhost",
-               .rrdset_root = NULL,
-               .rrdset_root_rwlock = PTHREAD_RWLOCK_INITIALIZER,
-        .rrdset_root_index = {
-            { NULL, rrdset_compare },
-            AVL_LOCK_INITIALIZER
-        },
-        .rrdset_root_index_name = {
-            { NULL, rrdset_compare_name },
-            AVL_LOCK_INITIALIZER
-        },
-        .rrdcontext_root_index = {
-            { NULL, rrdcontext_compare },
-            AVL_LOCK_INITIALIZER
-        },
-        .variables_root_index = {
-            { NULL, rrdvar_compare },
-            AVL_LOCK_INITIALIZER
-        }
-};
-
-void rrdhost_rwlock(RRDHOST *host) {
-       pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
-}
-
-void rrdhost_rdlock(RRDHOST *host) {
-       pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
-}
+// RRD - memory modes
 
-void rrdhost_unlock(RRDHOST *host) {
-       pthread_rwlock_unlock(&host->rrdset_root_rwlock);
-}
+inline const char *rrd_memory_mode_name(RRD_MEMORY_MODE id) {
+    switch(id) {
+        case RRD_MEMORY_MODE_RAM:
+            return RRD_MEMORY_MODE_RAM_NAME;
 
-void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
-       if(pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock) == 0) {
-               fatal("RRDHOST '%s' should be write-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
-       }
-}
+        case RRD_MEMORY_MODE_MAP:
+            return RRD_MEMORY_MODE_MAP_NAME;
 
-// ----------------------------------------------------------------------------
-// RRDCONTEXT index
+        case RRD_MEMORY_MODE_NONE:
+            return RRD_MEMORY_MODE_NONE_NAME;
 
-static int rrdcontext_compare(void* a, void* b) {
-    if(((RRDCONTEXT *)a)->hash < ((RRDCONTEXT *)b)->hash) return -1;
-    else if(((RRDCONTEXT *)a)->hash > ((RRDCONTEXT *)b)->hash) return 1;
-    else return strcmp(((RRDCONTEXT *)a)->id, ((RRDCONTEXT *)b)->id);
-}
-
-#define rrdcontext_index_add(host, rc) (RRDCONTEXT *)avl_insert_lock(&((host)->rrdcontext_root_index), (avl *)(rc))
-#define rrdcontext_index_del(host, rc) (RRDCONTEXT *)avl_remove_lock(&((host)->rrdcontext_root_index), (avl *)(rc))
-
-static RRDCONTEXT *rrdcontext_index_find(RRDHOST *host, const char *id, uint32_t hash) {
-    RRDCONTEXT tmp;
-    tmp.id = id;
-    tmp.hash = (hash)?hash:simple_hash(tmp.id);
-
-    return (RRDCONTEXT *)avl_search_lock(&(host->rrdcontext_root_index), (avl *) &tmp);
-}
-
-RRDCONTEXT *rrdcontext_create(const char *id) {
-    RRDCONTEXT *rc = rrdcontext_index_find(&localhost, id, 0);
-    if(!rc) {
-        rc = callocz(1, sizeof(RRDCONTEXT));
-
-        rc->id = strdupz(id);
-        rc->hash = simple_hash(rc->id);
-
-        // initialize the variables index
-        avl_init_lock(&rc->variables_root_index, rrdvar_compare);
-
-        RRDCONTEXT *ret = rrdcontext_index_add(&localhost, rc);
-        if(ret != rc)
-            fatal("INTERNAL ERROR: Expected to INSERT RRDCONTEXT '%s' into index, but inserted '%s'.", rc->id, (ret)?ret->id:"NONE");
+        case RRD_MEMORY_MODE_SAVE:
+        default:
+            return RRD_MEMORY_MODE_SAVE_NAME;
     }
-
-    rc->use_count++;
-    return rc;
 }
 
-void rrdcontext_free(RRDCONTEXT *rc) {
-    rc->use_count--;
-    if(!rc->use_count) {
-        RRDCONTEXT *ret = rrdcontext_index_del(&localhost, rc);
-        if(ret != rc)
-            fatal("INTERNAL ERROR: Expected to DELETE RRDCONTEXT '%s' from index, but deleted '%s'.", rc->id, (ret)?ret->id:"NONE");
+RRD_MEMORY_MODE rrd_memory_mode_id(const char *name) {
+    if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
+        return RRD_MEMORY_MODE_RAM;
+    else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
+        return RRD_MEMORY_MODE_MAP;
+    else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_NONE_NAME)))
+        return RRD_MEMORY_MODE_NONE;
 
-        if(rc->variables_root_index.avl_tree.root != NULL)
-            fatal("INTERNAL ERROR: Variables index of RRDCONTEXT '%s' that is freed, is not empty.", rc->id);
-
-        freez((void *)rc->id);
-        freez(rc);
-    }
+    return RRD_MEMORY_MODE_SAVE;
 }
 
-// ----------------------------------------------------------------------------
-// RRDSET index
-
-static int rrdset_compare(void* a, void* b) {
-    if(((RRDSET *)a)->hash < ((RRDSET *)b)->hash) return -1;
-    else if(((RRDSET *)a)->hash > ((RRDSET *)b)->hash) return 1;
-    else return strcmp(((RRDSET *)a)->id, ((RRDSET *)b)->id);
-}
-
-#define rrdset_index_add(host, st) (RRDSET *)avl_insert_lock(&((host)->rrdset_root_index), (avl *)(st))
-#define rrdset_index_del(host, st) (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index), (avl *)(st))
-
-static RRDSET *rrdset_index_find(RRDHOST *host, const char *id, uint32_t hash) {
-    RRDSET tmp;
-    strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
-    tmp.hash = (hash)?hash:simple_hash(tmp.id);
-
-    return (RRDSET *)avl_search_lock(&(host->rrdset_root_index), (avl *) &tmp);
-}
 
 // ----------------------------------------------------------------------------
-// RRDSET name index
+// RRD - algorithms types
 
-#define rrdset_from_avlname(avlname_ptr) ((RRDSET *)((avlname_ptr) - offsetof(RRDSET, avlname)))
+RRD_ALGORITHM rrd_algorithm_id(const char *name) {
+    if(strcmp(name, RRD_ALGORITHM_INCREMENTAL_NAME) == 0)
+        return RRD_ALGORITHM_INCREMENTAL;
 
-static int rrdset_compare_name(void* a, void* b) {
-       RRDSET *A = rrdset_from_avlname(a);
-       RRDSET *B = rrdset_from_avlname(b);
+    else if(strcmp(name, RRD_ALGORITHM_ABSOLUTE_NAME) == 0)
+        return RRD_ALGORITHM_ABSOLUTE;
 
-       // fprintf(stderr, "COMPARING: %s with %s\n", A->name, B->name);
+    else if(strcmp(name, RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME) == 0)
+        return RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL;
 
-       if(A->hash_name < B->hash_name) return -1;
-       else if(A->hash_name > B->hash_name) return 1;
-       else return strcmp(A->name, B->name);
-}
-
-RRDSET *rrdset_index_add_name(RRDHOST *host, RRDSET *st) {
-    void *result;
-       // fprintf(stderr, "ADDING: %s (name: %s)\n", st->id, st->name);
-       result = avl_insert_lock(&host->rrdset_root_index_name, (avl *) (&st->avlname));
-    if(result) return rrdset_from_avlname(result);
-    return NULL;
-}
+    else if(strcmp(name, RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)
+        return RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL;
 
-RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
-    void *result;
-    // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
-    return (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
-    if(result) return rrdset_from_avlname(result);
-    return NULL;
+    else
+        return RRD_ALGORITHM_ABSOLUTE;
 }
 
-static RRDSET *rrdset_index_find_name(RRDHOST *host, const char *name, uint32_t hash) {
-       void *result = NULL;
-       RRDSET tmp;
-       tmp.name = name;
-       tmp.hash_name = (hash)?hash:simple_hash(tmp.name);
+const char *rrd_algorithm_name(RRD_ALGORITHM algorithm) {
+    switch(algorithm) {
+        case RRD_ALGORITHM_ABSOLUTE:
+        default:
+            return RRD_ALGORITHM_ABSOLUTE_NAME;
 
-       // fprintf(stderr, "SEARCHING: %s\n", name);
-       result = avl_search_lock(&host->rrdset_root_index_name, (avl *) (&(tmp.avlname)));
-       if(result) {
-               RRDSET *st = rrdset_from_avlname(result);
-               if(strcmp(st->magic, RRDSET_MAGIC))
-                       error("Search for RRDSET %s returned an invalid RRDSET %s (name %s)", name, st->id, st->name);
-
-               // fprintf(stderr, "FOUND: %s\n", name);
-               return rrdset_from_avlname(result);
-       }
-       // fprintf(stderr, "NOT FOUND: %s\n", name);
-       return NULL;
-}
+        case RRD_ALGORITHM_INCREMENTAL:
+            return RRD_ALGORITHM_INCREMENTAL_NAME;
 
+        case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
+            return RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME;
 
-// ----------------------------------------------------------------------------
-// RRDDIM index
-
-static int rrddim_compare(void* a, void* b) {
-       if(((RRDDIM *)a)->hash < ((RRDDIM *)b)->hash) return -1;
-       else if(((RRDDIM *)a)->hash > ((RRDDIM *)b)->hash) return 1;
-       else return strcmp(((RRDDIM *)a)->id, ((RRDDIM *)b)->id);
-}
-
-#define rrddim_index_add(st, rd) avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
-#define rrddim_index_del(st,rd ) avl_remove_lock(&((st)->dimensions_index), (avl *)(rd))
-
-static RRDDIM *rrddim_index_find(RRDSET *st, const char *id, uint32_t hash) {
-       RRDDIM tmp;
-       strncpyz(tmp.id, id, RRD_ID_LENGTH_MAX);
-       tmp.hash = (hash)?hash:simple_hash(tmp.id);
-
-       return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
-}
-
-// ----------------------------------------------------------------------------
-// chart types
-
-int rrdset_type_id(const char *name)
-{
-       if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0)) return RRDSET_TYPE_AREA;
-       else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0)) return RRDSET_TYPE_STACKED;
-       else if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0)) return RRDSET_TYPE_LINE;
-       return RRDSET_TYPE_LINE;
-}
-
-const char *rrdset_type_name(int chart_type)
-{
-       static char line[] = RRDSET_TYPE_LINE_NAME;
-       static char area[] = RRDSET_TYPE_AREA_NAME;
-       static char stacked[] = RRDSET_TYPE_STACKED_NAME;
-
-       switch(chart_type) {
-               case RRDSET_TYPE_LINE:
-                       return line;
-
-               case RRDSET_TYPE_AREA:
-                       return area;
-
-               case RRDSET_TYPE_STACKED:
-                       return stacked;
-       }
-       return line;
-}
-
-// ----------------------------------------------------------------------------
-// load / save
-
-const char *rrd_memory_mode_name(int id)
-{
-       static const char ram[] = RRD_MEMORY_MODE_RAM_NAME;
-       static const char map[] = RRD_MEMORY_MODE_MAP_NAME;
-       static const char save[] = RRD_MEMORY_MODE_SAVE_NAME;
-
-       switch(id) {
-               case RRD_MEMORY_MODE_RAM:
-                       return ram;
-
-               case RRD_MEMORY_MODE_MAP:
-                       return map;
-
-               case RRD_MEMORY_MODE_SAVE:
-               default:
-                       return save;
-       }
-
-       return save;
+        case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
+            return RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME;
+    }
 }
 
-int rrd_memory_mode_id(const char *name)
-{
-       if(unlikely(!strcmp(name, RRD_MEMORY_MODE_RAM_NAME)))
-               return RRD_MEMORY_MODE_RAM;
-       else if(unlikely(!strcmp(name, RRD_MEMORY_MODE_MAP_NAME)))
-               return RRD_MEMORY_MODE_MAP;
-
-       return RRD_MEMORY_MODE_SAVE;
-}
 
 // ----------------------------------------------------------------------------
-// algorithms types
+// RRD - chart types
 
-int rrddim_algorithm_id(const char *name)
-{
-       if(strcmp(name, RRDDIM_INCREMENTAL_NAME) == 0)                  return RRDDIM_INCREMENTAL;
-       if(strcmp(name, RRDDIM_ABSOLUTE_NAME) == 0)                     return RRDDIM_ABSOLUTE;
-       if(strcmp(name, RRDDIM_PCENT_OVER_ROW_TOTAL_NAME) == 0)                 return RRDDIM_PCENT_OVER_ROW_TOTAL;
-       if(strcmp(name, RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)        return RRDDIM_PCENT_OVER_DIFF_TOTAL;
-       return RRDDIM_ABSOLUTE;
-}
+inline RRDSET_TYPE rrdset_type_id(const char *name) {
+    if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0))
+        return RRDSET_TYPE_AREA;
 
-const char *rrddim_algorithm_name(int chart_type)
-{
-       static char absolute[] = RRDDIM_ABSOLUTE_NAME;
-       static char incremental[] = RRDDIM_INCREMENTAL_NAME;
-       static char percentage_of_absolute_row[] = RRDDIM_PCENT_OVER_ROW_TOTAL_NAME;
-       static char percentage_of_incremental_row[] = RRDDIM_PCENT_OVER_DIFF_TOTAL_NAME;
+    else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0))
+        return RRDSET_TYPE_STACKED;
 
-       switch(chart_type) {
-               case RRDDIM_ABSOLUTE:
-                       return absolute;
-
-               case RRDDIM_INCREMENTAL:
-                       return incremental;
-
-               case RRDDIM_PCENT_OVER_ROW_TOTAL:
-                       return percentage_of_absolute_row;
-
-               case RRDDIM_PCENT_OVER_DIFF_TOTAL:
-                       return percentage_of_incremental_row;
-       }
-       return absolute;
+    else // if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0))
+        return RRDSET_TYPE_LINE;
 }
 
-// ----------------------------------------------------------------------------
-// chart names
-
-char *rrdset_strncpyz_name(char *to, const char *from, size_t length)
-{
-       char c, *p = to;
-
-       while (length-- && (c = *from++)) {
-               if(c != '.' && !isalnum(c))
-                       c = '_';
-
-               *p++ = c;
-       }
+const char *rrdset_type_name(RRDSET_TYPE chart_type) {
+    switch(chart_type) {
+        case RRDSET_TYPE_LINE:
+        default:
+            return RRDSET_TYPE_LINE_NAME;
 
-       *p = '\0';
-
-       return to;
-}
+        case RRDSET_TYPE_AREA:
+            return RRDSET_TYPE_AREA_NAME;
 
-void rrdset_set_name(RRDSET *st, const char *name)
-{
-       debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, name);
-
-       if(st->name) {
-        rrdset_index_del_name(&localhost, st);
-        rrdsetvar_rename_all(st);
+        case RRDSET_TYPE_STACKED:
+            return RRDSET_TYPE_STACKED_NAME;
     }
-
-       char b[CONFIG_MAX_VALUE + 1];
-       char n[RRD_ID_LENGTH_MAX + 1];
-
-       snprintfz(n, RRD_ID_LENGTH_MAX, "%s.%s", st->type, name);
-       rrdset_strncpyz_name(b, n, CONFIG_MAX_VALUE);
-       st->name = config_get(st->id, "name", b);
-       st->hash_name = simple_hash(st->name);
-
-       rrdset_index_add_name(&localhost, st);
 }
 
-// ----------------------------------------------------------------------------
-// cache directory
-
-char *rrdset_cache_dir(const char *id)
-{
-       char *ret = NULL;
-
-       static char *cache_dir = NULL;
-       if(!cache_dir) {
-               cache_dir = config_get("global", "cache directory", CACHE_DIR);
-               int r = mkdir(cache_dir, 0755);
-               if(r != 0 && errno != EEXIST)
-                       error("Cannot create directory '%s'", cache_dir);
-       }
-
-       char b[FILENAME_MAX + 1];
-       char n[FILENAME_MAX + 1];
-       rrdset_strncpyz_name(b, id, FILENAME_MAX);
-
-       snprintfz(n, FILENAME_MAX, "%s/%s", cache_dir, b);
-       ret = config_get(id, "cache directory", n);
-
-       if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
-               int r = mkdir(ret, 0775);
-               if(r != 0 && errno != EEXIST)
-                       error("Cannot create directory '%s'", ret);
-       }
-
-       return ret;
-}
 
 // ----------------------------------------------------------------------------
-// core functions
-
-void rrdset_reset(RRDSET *st)
-{
-       debug(D_RRD_CALLS, "rrdset_reset() %s", st->name);
-
-       st->last_collected_time.tv_sec = 0;
-       st->last_collected_time.tv_usec = 0;
-       st->last_updated.tv_sec = 0;
-       st->last_updated.tv_usec = 0;
-       st->current_entry = 0;
-       st->counter = 0;
-       st->counter_done = 0;
-
-       RRDDIM *rd;
-       for(rd = st->dimensions; rd ; rd = rd->next) {
-               rd->last_collected_time.tv_sec = 0;
-               rd->last_collected_time.tv_usec = 0;
-               rd->counter = 0;
-               bzero(rd->values, rd->entries * sizeof(storage_number));
-       }
-}
-
-RRDSET *rrdset_create(const char *type, const char *id, const char *name, const char *family, const char *context, const char *title, const char *units, long priority, int update_every, int chart_type)
-{
-       if(!type || !type[0]) {
-               fatal("Cannot create rrd stats without a type.");
-               return NULL;
-       }
-
-       if(!id || !id[0]) {
-               fatal("Cannot create rrd stats without an id.");
-               return NULL;
-       }
-
-       char fullid[RRD_ID_LENGTH_MAX + 1];
-       char fullfilename[FILENAME_MAX + 1];
-       RRDSET *st = NULL;
-
-       snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
-
-       st = rrdset_find(fullid);
-       if(st) {
-               error("Cannot create rrd stats for '%s', it already exists.", fullid);
-               return st;
-       }
-
-       long entries = config_get_number(fullid, "history", rrd_default_history_entries);
-       if(entries < 5) entries = config_set_number(fullid, "history", 5);
-       if(entries > RRD_HISTORY_ENTRIES_MAX) entries = config_set_number(fullid, "history", RRD_HISTORY_ENTRIES_MAX);
-
-       int enabled = config_get_boolean(fullid, "enabled", 1);
-       if(!enabled) entries = 5;
-
-       unsigned long size = sizeof(RRDSET);
-       char *cache_dir = rrdset_cache_dir(fullid);
-
-       debug(D_RRD_CALLS, "Creating RRD_STATS for '%s.%s'.", type, id);
-
-       snprintfz(fullfilename, FILENAME_MAX, "%s/main.db", cache_dir);
-       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);
-       if(st) {
-               if(strcmp(st->magic, RRDSET_MAGIC) != 0) {
-                       errno = 0;
-                       info("Initializing file %s.", fullfilename);
-                       bzero(st, size);
-               }
-               else if(strcmp(st->id, fullid) != 0) {
-                       errno = 0;
-                       error("File %s contents are not for chart %s. Clearing it.", fullfilename, fullid);
-                       // munmap(st, size);
-                       // st = NULL;
-                       bzero(st, size);
-               }
-               else if(st->memsize != size || st->entries != entries) {
-                       errno = 0;
-                       error("File %s does not have the desired size. Clearing it.", fullfilename);
-                       bzero(st, size);
-               }
-               else if(st->update_every != update_every) {
-                       errno = 0;
-                       error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
-                       bzero(st, size);
-               }
-               else if((time(NULL) - st->last_updated.tv_sec) > update_every * entries) {
-                       errno = 0;
-                       error("File %s is too old. Clearing it.", fullfilename);
-                       bzero(st, size);
-               }
-       }
-
-       if(st) {
-               st->name = NULL;
-               st->type = NULL;
-               st->family = NULL;
-               st->context = NULL;
-               st->title = NULL;
-               st->units = NULL;
-               st->dimensions = NULL;
-               st->next = NULL;
-               st->mapped = rrd_memory_mode;
-        st->variables = NULL;
-       }
-       else {
-               st = callocz(1, size);
-               st->mapped = RRD_MEMORY_MODE_RAM;
-       }
-       st->memsize = size;
-       st->entries = entries;
-       st->update_every = update_every;
-
-       if(st->current_entry >= st->entries) st->current_entry = 0;
-
-       strcpy(st->cache_filename, fullfilename);
-       strcpy(st->magic, RRDSET_MAGIC);
-
-       strcpy(st->id, fullid);
-       st->hash = simple_hash(st->id);
-
-       st->cache_dir = cache_dir;
-
-       st->chart_type = rrdset_type_id(config_get(st->id, "chart type", rrdset_type_name(chart_type)));
-       st->type       = config_get(st->id, "type", type);
-       st->family     = config_get(st->id, "family", family?family:st->type);
-       st->context    = config_get(st->id, "context", context?context:st->id);
-       st->units      = config_get(st->id, "units", units?units:"");
-
-       st->priority = config_get_number(st->id, "priority", priority);
-       st->enabled = enabled;
-
-       st->isdetail = 0;
-       st->debug = 0;
-
-       st->last_collected_time.tv_sec = 0;
-       st->last_collected_time.tv_usec = 0;
-       st->counter_done = 0;
-
-       st->gap_when_lost_iterations_above = (int) (
-                       config_get_number(st->id, "gap when lost iterations above", RRD_DEFAULT_GAP_INTERPOLATIONS) + 2);
-
-       avl_init_lock(&st->dimensions_index, rrddim_compare);
-    avl_init_lock(&st->variables_root_index, rrdvar_compare);
-
-       pthread_rwlock_init(&st->rwlock, NULL);
-       pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
-
-       if(name && *name) rrdset_set_name(st, name);
-       else rrdset_set_name(st, id);
-
-       {
-               char varvalue[CONFIG_MAX_VALUE + 1];
-               snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
-               st->title = config_get(st->id, "title", varvalue);
-       }
-
-    st->rrdcontext = rrdcontext_create(st->context);
-    st->rrdhost = &localhost;
+// RRD - cache directory
 
-    st->next = localhost.rrdset_root;
-    localhost.rrdset_root = st;
+char *rrdset_cache_dir(RRDHOST *host, const char *id, const char *config_section) {
+    char *ret = NULL;
 
-    rrdsetvar_create(st, "last_collected", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
-    rrdsetvar_create(st, "raw_total", RRDVAR_TYPE_TOTAL, &st->collected_total, 0);
+    char b[FILENAME_MAX + 1];
+    char n[FILENAME_MAX + 1];
+    rrdset_strncpyz_name(b, id, FILENAME_MAX);
 
-    rrdset_index_add(&localhost, st);
+    snprintfz(n, FILENAME_MAX, "%s/%s", host->cache_dir, b);
+    ret = config_get(config_section, "cache directory", n);
 
-    rrdsetcalc_link_matching(st);
-
-       pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
-
-       return(st);
-}
-
-RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
-{
-       char filename[FILENAME_MAX + 1];
-       char fullfilename[FILENAME_MAX + 1];
-
-       char varname[CONFIG_MAX_NAME + 1];
-       RRDDIM *rd = NULL;
-       unsigned long size = sizeof(RRDDIM) + (st->entries * sizeof(storage_number));
-
-       debug(D_RRD_CALLS, "Adding dimension '%s/%s'.", st->id, id);
-
-       rrdset_strncpyz_name(filename, id, FILENAME_MAX);
-       snprintfz(fullfilename, FILENAME_MAX, "%s/%s.db", st->cache_dir, filename);
-       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);
-       if(rd) {
-               struct timeval now;
-               gettimeofday(&now, NULL);
-
-               if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
-                       errno = 0;
-                       info("Initializing file %s.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(rd->memsize != size) {
-                       errno = 0;
-                       error("File %s does not have the desired size. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(rd->multiplier != multiplier) {
-                       errno = 0;
-                       error("File %s does not have the same multiplier. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(rd->divisor != divisor) {
-                       errno = 0;
-                       error("File %s does not have the same divisor. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(rd->algorithm != algorithm) {
-                       errno = 0;
-                       error("File %s does not have the same algorithm. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(rd->update_every != st->update_every) {
-                       errno = 0;
-                       error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(usec_dt(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * 1000000ULL)) {
-                       errno = 0;
-                       error("File %s is too old. Clearing it.", fullfilename);
-                       bzero(rd, size);
-               }
-               else if(strcmp(rd->id, id) != 0) {
-                       errno = 0;
-                       error("File %s contents are not for dimension %s. Clearing it.", fullfilename, id);
-                       // munmap(rd, size);
-                       // rd = NULL;
-                       bzero(rd, size);
-               }
-       }
-
-       if(rd) {
-               // we have a file mapped for rd
-               rd->mapped = rrd_memory_mode;
-               rd->flags = 0x00000000;
-        rd->variables = NULL;
-               rd->next = NULL;
-               rd->name = NULL;
-       }
-       else {
-               // if we didn't manage to get a mmap'd dimension, just create one
-
-               rd = callocz(1, size);
-               rd->mapped = RRD_MEMORY_MODE_RAM;
-       }
-       rd->memsize = size;
-
-       strcpy(rd->magic, RRDDIMENSION_MAGIC);
-       strcpy(rd->cache_filename, fullfilename);
-       strncpyz(rd->id, id, RRD_ID_LENGTH_MAX);
-       rd->hash = simple_hash(rd->id);
-
-       snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
-       rd->name = config_get(st->id, varname, (name && *name)?name:rd->id);
-
-       snprintfz(varname, CONFIG_MAX_NAME, "dim %s algorithm", rd->id);
-       rd->algorithm = rrddim_algorithm_id(config_get(st->id, varname, rrddim_algorithm_name(algorithm)));
-
-       snprintfz(varname, CONFIG_MAX_NAME, "dim %s multiplier", rd->id);
-       rd->multiplier = config_get_number(st->id, varname, multiplier);
-
-       snprintfz(varname, CONFIG_MAX_NAME, "dim %s divisor", rd->id);
-       rd->divisor = config_get_number(st->id, varname, divisor);
-       if(!rd->divisor) rd->divisor = 1;
-
-       rd->entries = st->entries;
-       rd->update_every = st->update_every;
-
-       // prevent incremental calculation spikes
-       rd->counter = 0;
-       rd->updated = 0;
-       rd->calculated_value = 0;
-       rd->last_calculated_value = 0;
-       rd->collected_value = 0;
-       rd->last_collected_value = 0;
-       rd->collected_volume = 0;
-       rd->stored_volume = 0;
-       rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
-       rd->last_collected_time.tv_sec = 0;
-       rd->last_collected_time.tv_usec = 0;
-    rd->rrdset = st;
-
-    // append this dimension
-       pthread_rwlock_wrlock(&st->rwlock);
-       if(!st->dimensions)
-               st->dimensions = rd;
-       else {
-               RRDDIM *td = st->dimensions;
-               for(; td->next; td = td->next) ;
-               td->next = rd;
-       }
-
-    rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->calculated_value, 0);
-    rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->collected_value, 0);
-    rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected", &rd->last_collected_time.tv_sec, 0);
-
-       pthread_rwlock_unlock(&st->rwlock);
-
-       rrddim_index_add(st, rd);
-
-       return(rd);
-}
-
-void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
-{
-       debug(D_RRD_CALLS, "rrddim_set_name() %s.%s", st->name, rd->name);
-
-       char varname[CONFIG_MAX_NAME + 1];
-       snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
-       config_set_default(st->id, varname, name);
-
-    rrddimvar_rename_all(rd);
-}
-
-void rrddim_free(RRDSET *st, RRDDIM *rd)
-{
-       debug(D_RRD_CALLS, "rrddim_free() %s.%s", st->name, rd->name);
-
-       RRDDIM *i, *last = NULL;
-       for(i = st->dimensions; i && i != rd ; i = i->next) last = i;
-
-       if(!i) {
-               error("Request to free dimension %s.%s but it is not linked.", st->id, rd->name);
-               return;
-       }
-
-       if(last) last->next = rd->next;
-       else st->dimensions = rd->next;
-       rd->next = NULL;
-
-    while(rd->variables)
-        rrddimvar_free(rd->variables);
-
-    rrddim_index_del(st, rd);
-
-       // free(rd->annotations);
-       if(rd->mapped == RRD_MEMORY_MODE_SAVE) {
-               debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
-               savememory(rd->cache_filename, rd, rd->memsize);
-
-               debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
-               munmap(rd, rd->memsize);
-       }
-       else if(rd->mapped == RRD_MEMORY_MODE_MAP) {
-               debug(D_RRD_CALLS, "Unmapping dimension '%s'.", rd->name);
-               munmap(rd, rd->memsize);
-       }
-       else {
-               debug(D_RRD_CALLS, "Removing dimension '%s'.", rd->name);
-               freez(rd);
-       }
-}
-
-void rrdset_free_all(void)
-{
-       info("Freeing all memory...");
-
-    pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
-
-       RRDSET *st;
-       for(st = localhost.rrdset_root; st ;) {
-               RRDSET *next = st->next;
-
-        pthread_rwlock_wrlock(&st->rwlock);
-
-        while(st->variables)
-            rrdsetvar_free(st->variables);
-
-        while(st->calculations)
-            rrdsetcalc_unlink(st->calculations);
-
-        while(st->dimensions)
-                       rrddim_free(st, st->dimensions);
-
-        rrdset_index_del(&localhost, st);
-
-        st->rrdcontext->use_count--;
-        if(!st->rrdcontext->use_count)
-            rrdcontext_free(st->rrdcontext);
-
-        pthread_rwlock_unlock(&st->rwlock);
-
-               if(st->mapped == RRD_MEMORY_MODE_SAVE) {
-                       debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
-                       savememory(st->cache_filename, st, st->memsize);
-
-                       debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
-                       munmap(st, st->memsize);
-               }
-               else if(st->mapped == RRD_MEMORY_MODE_MAP) {
-                       debug(D_RRD_CALLS, "Unmapping stats '%s'.", st->name);
-                       munmap(st, st->memsize);
-               }
-               else
-                       freez(st);
-
-               st = next;
-       }
-    localhost.rrdset_root = NULL;
-
-    pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
-
-       info("Memory cleanup completed...");
-}
-
-void rrdset_save_all(void) {
-       info("Saving database...");
-
-       RRDSET *st;
-       RRDDIM *rd;
-
-       pthread_rwlock_wrlock(&localhost.rrdset_root_rwlock);
-       for(st = localhost.rrdset_root; st ; st = st->next) {
-               pthread_rwlock_wrlock(&st->rwlock);
-
-               if(st->mapped == RRD_MEMORY_MODE_SAVE) {
-                       debug(D_RRD_CALLS, "Saving stats '%s' to '%s'.", st->name, st->cache_filename);
-                       savememory(st->cache_filename, st, st->memsize);
-               }
-
-               for(rd = st->dimensions; rd ; rd = rd->next) {
-                       if(likely(rd->mapped == RRD_MEMORY_MODE_SAVE)) {
-                               debug(D_RRD_CALLS, "Saving dimension '%s' to '%s'.", rd->name, rd->cache_filename);
-                               savememory(rd->cache_filename, rd, rd->memsize);
-                       }
-               }
-
-               pthread_rwlock_unlock(&st->rwlock);
-       }
-       pthread_rwlock_unlock(&localhost.rrdset_root_rwlock);
-}
-
-
-RRDSET *rrdset_find(const char *id)
-{
-       debug(D_RRD_CALLS, "rrdset_find() for chart %s", id);
-
-       RRDSET *st = rrdset_index_find(&localhost, id, 0);
-       return(st);
-}
-
-RRDSET *rrdset_find_bytype(const char *type, const char *id)
-{
-       debug(D_RRD_CALLS, "rrdset_find_bytype() for chart %s.%s", type, id);
-
-       char buf[RRD_ID_LENGTH_MAX + 1];
-
-       strncpyz(buf, type, RRD_ID_LENGTH_MAX - 1);
-       strcat(buf, ".");
-       int len = (int) strlen(buf);
-       strncpyz(&buf[len], id, (size_t) (RRD_ID_LENGTH_MAX - len));
-
-       return(rrdset_find(buf));
-}
-
-RRDSET *rrdset_find_byname(const char *name)
-{
-       debug(D_RRD_CALLS, "rrdset_find_byname() for chart %s", name);
-
-       RRDSET *st = rrdset_index_find_name(&localhost, name, 0);
-       return(st);
-}
-
-RRDDIM *rrddim_find(RRDSET *st, const char *id)
-{
-       debug(D_RRD_CALLS, "rrddim_find() for chart %s, dimension %s", st->name, id);
-
-       return rrddim_index_find(st, id, 0);
-}
-
-int rrddim_hide(RRDSET *st, const char *id)
-{
-       debug(D_RRD_CALLS, "rrddim_hide() for chart %s, dimension %s", st->name, id);
-
-       RRDDIM *rd = rrddim_find(st, id);
-       if(unlikely(!rd)) {
-               error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
-               return 1;
-       }
-
-       rd->flags |= RRDDIM_FLAG_HIDDEN;
-       return 0;
-}
-
-int rrddim_unhide(RRDSET *st, const char *id)
-{
-       debug(D_RRD_CALLS, "rrddim_unhide() for chart %s, dimension %s", st->name, id);
-
-       RRDDIM *rd = rrddim_find(st, id);
-       if(unlikely(!rd)) {
-               error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
-               return 1;
-       }
-
-       if(rd->flags & RRDDIM_FLAG_HIDDEN) rd->flags ^= RRDDIM_FLAG_HIDDEN;
-       return 0;
-}
-
-collected_number rrddim_set_by_pointer(RRDSET *st, RRDDIM *rd, collected_number value)
-{
-       debug(D_RRD_CALLS, "rrddim_set_by_pointer() for chart %s, dimension %s, value " COLLECTED_NUMBER_FORMAT, st->name, rd->name, value);
-
-       gettimeofday(&rd->last_collected_time, NULL);
-       rd->collected_value = value;
-       rd->updated = 1;
-       rd->counter++;
-
-       return rd->last_collected_value;
-}
-
-collected_number rrddim_set(RRDSET *st, const char *id, collected_number value)
-{
-       RRDDIM *rd = rrddim_find(st, id);
-       if(unlikely(!rd)) {
-               error("Cannot find dimension with id '%s' on stats '%s' (%s).", id, st->name, st->id);
-               return 0;
-       }
-
-       return rrddim_set_by_pointer(st, rd, value);
-}
-
-void rrdset_next_usec(RRDSET *st, unsigned long long microseconds)
-{
-       if(!microseconds) rrdset_next(st);
-       else {
-               debug(D_RRD_CALLS, "rrdset_next_usec() for chart %s with microseconds %llu", st->name, microseconds);
-
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: NEXT: %llu microseconds", st->name, microseconds);
-               st->usec_since_last_update = microseconds;
-       }
-}
-
-void rrdset_next(RRDSET *st)
-{
-       unsigned long long microseconds = 0;
-
-       if(likely(st->last_collected_time.tv_sec)) {
-               struct timeval now;
-               gettimeofday(&now, NULL);
-               microseconds = usec_dt(&now, &st->last_collected_time);
-       }
-       // prevent infinite loop
-       else microseconds = st->update_every * 1000000ULL;
-
-       rrdset_next_usec(st, microseconds);
-}
-
-void rrdset_next_plugins(RRDSET *st)
-{
-       rrdset_next(st);
-}
-
-unsigned long long rrdset_done(RRDSET *st)
-{
-       if(unlikely(netdata_exit)) return 0;
-
-       debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
-
-       RRDDIM *rd, *last;
-       int oldstate, store_this_entry = 1, first_entry = 0;
-       unsigned long long last_ut, now_ut, next_ut, stored_entries = 0;
-
-       if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate) != 0))
-               error("Cannot set pthread cancel state to DISABLE.");
-
-       // a read lock is OK here
-       pthread_rwlock_rdlock(&st->rwlock);
-
-       // enable the chart, if it was disabled
-       if(unlikely(rrd_delete_unupdated_dimensions) && !st->enabled)
-               st->enabled = 1;
-
-       // check if the chart has a long time to be updated
-       if(unlikely(st->usec_since_last_update > st->entries * st->update_every * 1000000ULL)) {
-               info("%s: took too long to be updated (%0.3Lf secs). Reseting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
-               rrdset_reset(st);
-               st->usec_since_last_update = st->update_every * 1000000ULL;
-               first_entry = 1;
-       }
-       if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: microseconds since last update: %llu", st->name, st->usec_since_last_update);
-
-       // set last_collected_time
-       if(unlikely(!st->last_collected_time.tv_sec)) {
-               // it is the first entry
-               // set the last_collected_time to now
-               gettimeofday(&st->last_collected_time, NULL);
-
-               // the first entry should not be stored
-               store_this_entry = 0;
-               first_entry = 1;
-
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: has not set last_collected_time. Setting it now. Will not store the next entry.", st->name);
-       }
-       else {
-               // it is not the first entry
-               // calculate the proper last_collected_time, using usec_since_last_update
-               unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec + st->usec_since_last_update;
-               st->last_collected_time.tv_sec = (time_t) (ut / 1000000ULL);
-               st->last_collected_time.tv_usec = (suseconds_t) (ut % 1000000ULL);
-       }
-
-       // if this set has not been updated in the past
-       // we fake the last_update time to be = now - usec_since_last_update
-       if(unlikely(!st->last_updated.tv_sec)) {
-               // it has never been updated before
-               // set a fake last_updated, in the past using usec_since_last_update
-               unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
-               st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
-               st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
-
-               // the first entry should not be stored
-               store_this_entry = 0;
-               first_entry = 1;
-
-               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);
-       }
-
-       // check if we will re-write the entire data set
-       if(unlikely(usec_dt(&st->last_collected_time, &st->last_updated) > st->update_every * st->entries * 1000000ULL)) {
-               info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Reseting it. Will not store the next entry.", st->name, st->last_updated.tv_sec, st->last_updated.tv_usec, st->last_collected_time.tv_sec, st->last_collected_time.tv_usec);
-               rrdset_reset(st);
-
-               st->usec_since_last_update = st->update_every * 1000000ULL;
-
-               gettimeofday(&st->last_collected_time, NULL);
-
-               unsigned long long ut = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec - st->usec_since_last_update;
-               st->last_updated.tv_sec = (time_t) (ut / 1000000ULL);
-               st->last_updated.tv_usec = (suseconds_t) (ut % 1000000ULL);
-
-               // the first entry should not be stored
-               store_this_entry = 0;
-               first_entry = 1;
-       }
-
-       // these are the 3 variables that will help us in interpolation
-       // last_ut = the last time we added a value to the storage
-       //  now_ut = the time the current value is taken at
-       // next_ut = the time of the next interpolation point
-       last_ut = st->last_updated.tv_sec * 1000000ULL + st->last_updated.tv_usec;
-       now_ut  = st->last_collected_time.tv_sec * 1000000ULL + st->last_collected_time.tv_usec;
-       next_ut = (st->last_updated.tv_sec + st->update_every) * 1000000ULL;
-
-       if(unlikely(!first_entry && now_ut < next_ut)) {
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
-       }
-
-       if(unlikely(st->debug)) {
-               debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
-               debug(D_RRD_STATS, "%s: now  ut = %0.3Lf (current update time)", st->name, (long double)now_ut/1000000.0);
-               debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
-       }
-
-       if(unlikely(!st->counter_done)) {
-               store_this_entry = 0;
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: Will not store the next entry.", st->name);
-       }
-       st->counter_done++;
-
-       // calculate totals and count the dimensions
-       int dimensions;
-       st->collected_total = 0;
-       for( rd = st->dimensions, dimensions = 0 ; likely(rd) ; rd = rd->next, dimensions++ )
-               if(likely(rd->updated)) st->collected_total += rd->collected_value;
-
-       uint32_t storage_flags = SN_EXISTS;
-
-       // process all dimensions to calculate their values
-       // based on the collected figures only
-       // at this stage we do not interpolate anything
-       for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
-
-               if(unlikely(!rd->updated)) {
-                       rd->calculated_value = 0;
-                       continue;
-               }
-
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: START "
-                       " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                       " collected_value = " COLLECTED_NUMBER_FORMAT
-                       " last_calculated_value = " CALCULATED_NUMBER_FORMAT
-                       " calculated_value = " CALCULATED_NUMBER_FORMAT
-                       , st->id, rd->name
-                       , rd->last_collected_value
-                       , rd->collected_value
-                       , rd->last_calculated_value
-                       , rd->calculated_value
-                       );
-
-               switch(rd->algorithm) {
-                       case RRDDIM_ABSOLUTE:
-                               rd->calculated_value = (calculated_number)rd->collected_value
-                                       * (calculated_number)rd->multiplier
-                                       / (calculated_number)rd->divisor;
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: CALC ABS/ABS-NO-IN "
-                                               CALCULATED_NUMBER_FORMAT " = "
-                                               COLLECTED_NUMBER_FORMAT
-                                               " * " CALCULATED_NUMBER_FORMAT
-                                               " / " CALCULATED_NUMBER_FORMAT
-                                               , st->id, rd->name
-                                               , rd->calculated_value
-                                               , rd->collected_value
-                                               , (calculated_number)rd->multiplier
-                                               , (calculated_number)rd->divisor
-                                               );
-                               break;
-
-                       case RRDDIM_PCENT_OVER_ROW_TOTAL:
-                               if(unlikely(!st->collected_total))
-                                       rd->calculated_value = 0;
-                               else
-                                       // the percentage of the current value
-                                       // over the total of all dimensions
-                                       rd->calculated_value =
-                                             (calculated_number)100
-                                           * (calculated_number)rd->collected_value
-                                           / (calculated_number)st->collected_total;
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: CALC PCENT-ROW "
-                                               CALCULATED_NUMBER_FORMAT " = 100"
-                                               " * " COLLECTED_NUMBER_FORMAT
-                                               " / " COLLECTED_NUMBER_FORMAT
-                                               , st->id, rd->name
-                                               , rd->calculated_value
-                                               , rd->collected_value
-                                               , st->collected_total
-                                               );
-                               break;
-
-                       case RRDDIM_INCREMENTAL:
-                               if(unlikely(rd->counter <= 1)) {
-                                       rd->calculated_value = 0;
-                                       continue;
-                               }
-
-                               // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
-                               // to reset the calculation (it will give zero as the calculation for this second)
-                               if(unlikely(rd->last_collected_value > rd->collected_value)) {
-                                       debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
-                                                       , st->name, rd->name
-                                                       , rd->last_collected_value
-                                                       , rd->collected_value);
-                                       if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
-                                       rd->last_collected_value = rd->collected_value;
-                               }
-
-                               rd->calculated_value =
-                                     (calculated_number)(rd->collected_value - rd->last_collected_value)
-                                   * (calculated_number)rd->multiplier
-                                   / (calculated_number)rd->divisor;
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: CALC INC PRE "
-                                               CALCULATED_NUMBER_FORMAT " = ("
-                                               COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT
-                                               ")"
-                                               " * " CALCULATED_NUMBER_FORMAT
-                                               " / " CALCULATED_NUMBER_FORMAT
-                                               , st->id, rd->name
-                                               , rd->calculated_value
-                                               , rd->collected_value, rd->last_collected_value
-                                               , (calculated_number)rd->multiplier
-                                               , (calculated_number)rd->divisor
-                                               );
-                               break;
-
-                       case RRDDIM_PCENT_OVER_DIFF_TOTAL:
-                               if(unlikely(rd->counter <= 1)) {
-                                       rd->calculated_value = 0;
-                                       continue;
-                               }
-
-                               // if the new is smaller than the old (an overflow, or reset), set the old equal to the new
-                               // to reset the calculation (it will give zero as the calculation for this second)
-                               if(unlikely(rd->last_collected_value > rd->collected_value)) {
-                                       debug(D_RRD_STATS, "%s.%s: RESET or OVERFLOW. Last collected value = " COLLECTED_NUMBER_FORMAT ", current = " COLLECTED_NUMBER_FORMAT
-                                       , st->name, rd->name
-                                       , rd->last_collected_value
-                                       , rd->collected_value);
-                                       if(!(rd->flags & RRDDIM_FLAG_DONT_DETECT_RESETS_OR_OVERFLOWS)) storage_flags = SN_EXISTS_RESET;
-                                       rd->last_collected_value = rd->collected_value;
-                               }
-
-                               // the percentage of the current increment
-                               // over the increment of all dimensions together
-                               if(unlikely(st->collected_total == st->last_collected_total))
-                                       rd->calculated_value = 0;
-                               else
-                                       rd->calculated_value =
-                                                 (calculated_number)100
-                                               * (calculated_number)(rd->collected_value - rd->last_collected_value)
-                                               / (calculated_number)(st->collected_total - st->last_collected_total);
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: CALC PCENT-DIFF "
-                                               CALCULATED_NUMBER_FORMAT " = 100"
-                                               " * (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
-                                               " / (" COLLECTED_NUMBER_FORMAT " - " COLLECTED_NUMBER_FORMAT ")"
-                                               , st->id, rd->name
-                                               , rd->calculated_value
-                                               , rd->collected_value, rd->last_collected_value
-                                               , st->collected_total, st->last_collected_total
-                                               );
-                               break;
-
-                       default:
-                               // make the default zero, to make sure
-                               // it gets noticed when we add new types
-                               rd->calculated_value = 0;
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: CALC "
-                                               CALCULATED_NUMBER_FORMAT " = 0"
-                                               , st->id, rd->name
-                                               , rd->calculated_value
-                                               );
-                               break;
-               }
-
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: PHASE2 "
-                       " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                       " collected_value = " COLLECTED_NUMBER_FORMAT
-                       " last_calculated_value = " CALCULATED_NUMBER_FORMAT
-                       " calculated_value = " CALCULATED_NUMBER_FORMAT
-                       , st->id, rd->name
-                       , rd->last_collected_value
-                       , rd->collected_value
-                       , rd->last_calculated_value
-                       , rd->calculated_value
-                       );
-
-       }
-
-       // at this point we have all the calculated values ready
-       // it is now time to interpolate values on a second boundary
-
-       unsigned long long first_ut = last_ut;
-       long long iterations = (now_ut - last_ut) / (st->update_every * 1000000ULL);
-       if((now_ut % (st->update_every * 1000000ULL)) == 0) iterations++;
-
-       for( ; likely(next_ut <= now_ut) ; next_ut += st->update_every * 1000000ULL, iterations-- ) {
-#ifdef NETDATA_INTERNAL_CHECKS
-               if(iterations < 0) { error("%s: iterations calculation wrapped! first_ut = %llu, last_ut = %llu, next_ut = %llu, now_ut = %llu", st->name, first_ut, last_ut, next_ut, now_ut); }
-#endif
-
-               if(unlikely(st->debug)) {
-                       debug(D_RRD_STATS, "%s: last ut = %0.3Lf (last updated time)", st->name, (long double)last_ut/1000000.0);
-                       debug(D_RRD_STATS, "%s: next ut = %0.3Lf (next interpolation point)", st->name, (long double)next_ut/1000000.0);
-               }
-
-               st->last_updated.tv_sec = (time_t) (next_ut / 1000000ULL);
-               st->last_updated.tv_usec = 0;
-
-               for( rd = st->dimensions ; likely(rd) ; rd = rd->next ) {
-                       calculated_number new_value;
-
-                       switch(rd->algorithm) {
-                               case RRDDIM_INCREMENTAL:
-                                       new_value = (calculated_number)
-                                               (          rd->calculated_value
-                                                       * (calculated_number)(next_ut - last_ut)
-                                                       / (calculated_number)(now_ut - last_ut)
-                                               );
-
-                                       if(unlikely(st->debug))
-                                               debug(D_RRD_STATS, "%s/%s: CALC2 INC "
-                                                       CALCULATED_NUMBER_FORMAT " = "
-                                                       CALCULATED_NUMBER_FORMAT
-                                                       " * %llu"
-                                                       " / %llu"
-                                                       , st->id, rd->name
-                                                       , new_value
-                                                       , rd->calculated_value
-                                                       , (next_ut - last_ut)
-                                                       , (now_ut - last_ut)
-                                                       );
-
-                                       rd->calculated_value -= new_value;
-                                       new_value += rd->last_calculated_value;
-                                       rd->last_calculated_value = 0;
-                                       new_value /= (calculated_number)st->update_every;
-                                       break;
-
-                               case RRDDIM_ABSOLUTE:
-                               case RRDDIM_PCENT_OVER_ROW_TOTAL:
-                               case RRDDIM_PCENT_OVER_DIFF_TOTAL:
-                               default:
-                                       if(iterations == 1) {
-                                               // this is the last iteration
-                                               // do not interpolate
-                                               // just show the calculated value
-
-                                               new_value = rd->calculated_value;
-                                       }
-                                       else {
-                                               // we have missed an update
-                                               // interpolate in the middle values
-
-                                               new_value = (calculated_number)
-                                                       (       (         (rd->calculated_value - rd->last_calculated_value)
-                                                                       * (calculated_number)(next_ut - first_ut)
-                                                                       / (calculated_number)(now_ut - first_ut)
-                                                               )
-                                                               +  rd->last_calculated_value
-                                                       );
-
-                                               if(unlikely(st->debug))
-                                                       debug(D_RRD_STATS, "%s/%s: CALC2 DEF "
-                                                               CALCULATED_NUMBER_FORMAT " = ((("
-                                                               "(" CALCULATED_NUMBER_FORMAT " - " CALCULATED_NUMBER_FORMAT ")"
-                                                               " * %llu"
-                                                               " / %llu) + " CALCULATED_NUMBER_FORMAT
-                                                               , st->id, rd->name
-                                                               , new_value
-                                                               , rd->calculated_value, rd->last_calculated_value
-                                                               , (next_ut - first_ut)
-                                                               , (now_ut - first_ut), rd->last_calculated_value
-                                                               );
-
-                                               // this is wrong
-                                               // it fades the value towards the target
-                                               // while we know the calculated value is different
-                                               // if(likely(next_ut + st->update_every * 1000000ULL > now_ut)) rd->calculated_value = new_value;
-                                       }
-                                       break;
-                       }
-
-                       if(unlikely(!store_this_entry)) {
-                               store_this_entry = 1;
-                               continue;
-                       }
-
-                       if(likely(rd->updated && rd->counter > 1 && iterations < st->gap_when_lost_iterations_above)) {
-                               rd->values[st->current_entry] = pack_storage_number(new_value, storage_flags );
-
-                               if(unlikely(st->debug))
-                                       debug(D_RRD_STATS, "%s/%s: STORE[%ld] "
-                                               CALCULATED_NUMBER_FORMAT " = " CALCULATED_NUMBER_FORMAT
-                                               , st->id, rd->name
-                                               , st->current_entry
-                                               , unpack_storage_number(rd->values[st->current_entry]), new_value
-                                               );
-                       }
-                       else {
-                               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: STORE[%ld] = NON EXISTING "
-                                               , st->id, rd->name
-                                               , st->current_entry
-                                               );
-                               rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
-                       }
-
-                       stored_entries++;
-
-                       if(unlikely(st->debug)) {
-                               calculated_number t1 = new_value * (calculated_number)rd->multiplier / (calculated_number)rd->divisor;
-                               calculated_number t2 = unpack_storage_number(rd->values[st->current_entry]);
-                               calculated_number accuracy = accuracy_loss(t1, t2);
-                               debug(D_RRD_STATS, "%s/%s: UNPACK[%ld] = " CALCULATED_NUMBER_FORMAT " FLAGS=0x%08x (original = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s)"
-                                               , st->id, rd->name
-                                               , st->current_entry
-                                               , t2
-                                               , get_storage_number_flags(rd->values[st->current_entry])
-                                               , t1
-                                               , accuracy
-                                               , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
-                                               );
-
-                               rd->collected_volume += t1;
-                               rd->stored_volume += t2;
-                               accuracy = accuracy_loss(rd->collected_volume, rd->stored_volume);
-                               debug(D_RRD_STATS, "%s/%s: VOLUME[%ld] = " CALCULATED_NUMBER_FORMAT ", calculated  = " CALCULATED_NUMBER_FORMAT ", accuracy loss = " CALCULATED_NUMBER_FORMAT "%%%s"
-                                               , st->id, rd->name
-                                               , st->current_entry
-                                               , rd->stored_volume
-                                               , rd->collected_volume
-                                               , accuracy
-                                               , (accuracy > ACCURACY_LOSS) ? " **TOO BIG** " : ""
-                                               );
-
-                       }
-               }
-               // reset the storage flags for the next point, if any;
-               storage_flags = SN_EXISTS;
-
-               st->counter++;
-               st->current_entry = ((st->current_entry + 1) >= st->entries) ? 0 : st->current_entry + 1;
-               last_ut = next_ut;
-       }
-
-       // align next interpolation to last collection point
-       if(likely(stored_entries || !store_this_entry)) {
-               st->last_updated.tv_sec = st->last_collected_time.tv_sec;
-               st->last_updated.tv_usec = st->last_collected_time.tv_usec;
-               st->last_collected_total  = st->collected_total;
-       }
-
-       for( rd = st->dimensions; likely(rd) ; rd = rd->next ) {
-               if(unlikely(!rd->updated)) continue;
-
-               if(likely(stored_entries || !store_this_entry)) {
-                       if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: setting last_collected_value (old: " COLLECTED_NUMBER_FORMAT ") to last_collected_value (new: " COLLECTED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_collected_value, rd->collected_value);
-                       rd->last_collected_value = rd->collected_value;
-
-                       if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: setting last_calculated_value (old: " CALCULATED_NUMBER_FORMAT ") to last_calculated_value (new: " CALCULATED_NUMBER_FORMAT ")", st->id, rd->name, rd->last_calculated_value, rd->calculated_value);
-                       rd->last_calculated_value = rd->calculated_value;
-               }
-
-               rd->calculated_value = 0;
-               rd->collected_value = 0;
-               rd->updated = 0;
-
-               if(unlikely(st->debug)) debug(D_RRD_STATS, "%s/%s: END "
-                       " last_collected_value = " COLLECTED_NUMBER_FORMAT
-                       " collected_value = " COLLECTED_NUMBER_FORMAT
-                       " last_calculated_value = " CALCULATED_NUMBER_FORMAT
-                       " calculated_value = " CALCULATED_NUMBER_FORMAT
-                       , st->id, rd->name
-                       , rd->last_collected_value
-                       , rd->collected_value
-                       , rd->last_calculated_value
-                       , rd->calculated_value
-                       );
-       }
-
-       // ALL DONE ABOUT THE DATA UPDATE
-       // --------------------------------------------------------------------
-
-       // find if there are any obsolete dimensions (not updated recently)
-       if(unlikely(rrd_delete_unupdated_dimensions)) {
-
-               for( rd = st->dimensions; likely(rd) ; rd = rd->next )
-                       if((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)
-                               break;
-
-               if(unlikely(rd)) {
-                       // there is dimension to free
-                       // upgrade our read lock to a write lock
-                       pthread_rwlock_unlock(&st->rwlock);
-                       pthread_rwlock_wrlock(&st->rwlock);
-
-                       for( rd = st->dimensions, last = NULL ; likely(rd) ; ) {
-                               // remove it only it is not updated in rrd_delete_unupdated_dimensions seconds
-
-                               if(unlikely((rd->last_collected_time.tv_sec + (rrd_delete_unupdated_dimensions * st->update_every)) < st->last_collected_time.tv_sec)) {
-                                       info("Removing obsolete dimension '%s' (%s) of '%s' (%s).", rd->name, rd->id, st->name, st->id);
-
-                                       if(unlikely(!last)) {
-                                               st->dimensions = rd->next;
-                                               rd->next = NULL;
-                                               rrddim_free(st, rd);
-                                               rd = st->dimensions;
-                                               continue;
-                                       }
-                                       else {
-                                               last->next = rd->next;
-                                               rd->next = NULL;
-                                               rrddim_free(st, rd);
-                                               rd = last->next;
-                                               continue;
-                                       }
-                               }
-
-                               last = rd;
-                               rd = rd->next;
-                       }
-
-                       if(unlikely(!st->dimensions)) {
-                               info("Disabling chart %s (%s) since it does not have any dimensions", st->name, st->id);
-                               st->enabled = 0;
-                       }
-               }
-       }
-
-       pthread_rwlock_unlock(&st->rwlock);
-
-       if(unlikely(pthread_setcancelstate(oldstate, NULL) != 0))
-               error("Cannot set pthread cancel state to RESTORE (%d).", oldstate);
+    if(host->rrd_memory_mode == RRD_MEMORY_MODE_MAP || host->rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
+        int r = mkdir(ret, 0775);
+        if(r != 0 && errno != EEXIST)
+            error("Cannot create directory '%s'", ret);
+    }
 
-       return(st->usec_since_last_update);
+    return ret;
 }