New upstream version 1.6.0+dfsg

1 files changed, 65 insertions, 1577 deletions

diff --git a/src/rrd.c b/src/rrd.c
index bd0175ef..a9ff6243 100644
--- a/src/rrd.c
+++ b/src/rrd.c
@@ -1,7 +1,6 @@
+#define NETDATA_RRD_INTERNALS 1
 #include "common.h"
 
-#define RRD_DEFAULT_GAP_INTERPOLATIONS 1
-
 // ----------------------------------------------------------------------------
 // globals
 
@@ -12,402 +11,124 @@
 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 rrdfamily_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
-        },
-        .rrdfamily_root_index = {
-            { NULL, rrdfamily_compare },
-            AVL_LOCK_INITIALIZER
-        },
-        .variables_root_index = {
-            { NULL, rrdvar_compare },
-            AVL_LOCK_INITIALIZER
-        },
-        .health_log = {
-            .next_log_id = 1,
-            .next_alarm_id = 1,
-            .count = 0,
-            .max = 1000,
-            .alarms = NULL,
-            .alarm_log_rwlock = PTHREAD_RWLOCK_INITIALIZER
-        }
-};
-
-void rrdhost_init(char *hostname) {
-    localhost.hostname = hostname;
-    localhost.health_log.next_log_id =
-        localhost.health_log.next_alarm_id = now_realtime_sec();
-}
-
-void rrdhost_rwlock(RRDHOST *host) {
-    pthread_rwlock_wrlock(&host->rrdset_root_rwlock);
-}
-
-void rrdhost_rdlock(RRDHOST *host) {
-    pthread_rwlock_rdlock(&host->rrdset_root_rwlock);
-}
-
-void rrdhost_unlock(RRDHOST *host) {
-    pthread_rwlock_unlock(&host->rrdset_root_rwlock);
-}
-
-void rrdhost_check_rdlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
-    int ret = pthread_rwlock_trywrlock(&host->rrdset_root_rwlock);
-
-    if(ret == 0)
-        fatal("RRDHOST '%s' should be read-locked, but it is not, at function %s() at line %lu of file '%s'", host->hostname, function, line, file);
-}
-
-void rrdhost_check_wrlock_int(RRDHOST *host, const char *file, const char *function, const unsigned long line) {
-    int ret = pthread_rwlock_tryrdlock(&host->rrdset_root_rwlock);
-
-    if(ret == 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);
-}
-
-// ----------------------------------------------------------------------------
-// RRDFAMILY index
-
-static int rrdfamily_compare(void *a, void *b) {
-    if(((RRDFAMILY *)a)->hash_family < ((RRDFAMILY *)b)->hash_family) return -1;
-    else if(((RRDFAMILY *)a)->hash_family > ((RRDFAMILY *)b)->hash_family) return 1;
-    else return strcmp(((RRDFAMILY *)a)->family, ((RRDFAMILY *)b)->family);
-}
-
-#define rrdfamily_index_add(host, rc) (RRDFAMILY *)avl_insert_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
-#define rrdfamily_index_del(host, rc) (RRDFAMILY *)avl_remove_lock(&((host)->rrdfamily_root_index), (avl *)(rc))
-
-static RRDFAMILY *rrdfamily_index_find(RRDHOST *host, const char *id, uint32_t hash) {
-    RRDFAMILY tmp;
-    tmp.family = id;
-    tmp.hash_family = (hash)?hash:simple_hash(tmp.family);
-
-    return (RRDFAMILY *)avl_search_lock(&(host->rrdfamily_root_index), (avl *) &tmp);
-}
-
-RRDFAMILY *rrdfamily_create(const char *id) {
-    RRDFAMILY *rc = rrdfamily_index_find(&localhost, id, 0);
-    if(!rc) {
-        rc = callocz(1, sizeof(RRDFAMILY));
+// RRD - memory modes
 
-        rc->family = strdupz(id);
-        rc->hash_family = simple_hash(rc->family);
-
-        // initialize the variables index
-        avl_init_lock(&rc->variables_root_index, rrdvar_compare);
-
-        RRDFAMILY *ret = rrdfamily_index_add(&localhost, rc);
-        if(ret != rc)
-            fatal("RRDFAMILY: INTERNAL ERROR: Expected to INSERT RRDFAMILY '%s' into index, but inserted '%s'.", rc->family, (ret)?ret->family:"NONE");
-    }
-
-    rc->use_count++;
-    return rc;
-}
+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 rrdfamily_free(RRDFAMILY *rc) {
-    rc->use_count--;
-    if(!rc->use_count) {
-        RRDFAMILY *ret = rrdfamily_index_del(&localhost, rc);
-        if(ret != rc)
-            fatal("RRDFAMILY: INTERNAL ERROR: Expected to DELETE RRDFAMILY '%s' from index, but deleted '%s'.", rc->family, (ret)?ret->family:"NONE");
+        case RRD_MEMORY_MODE_MAP:
+            return RRD_MEMORY_MODE_MAP_NAME;
 
-        if(rc->variables_root_index.avl_tree.root != NULL)
-            fatal("RRDFAMILY: INTERNAL ERROR: Variables index of RRDFAMILY '%s' that is freed, is not empty.", rc->family);
+        case RRD_MEMORY_MODE_NONE:
+            return RRD_MEMORY_MODE_NONE_NAME;
 
-        freez((void *)rc->family);
-        freez(rc);
+        case RRD_MEMORY_MODE_SAVE:
+        default:
+            return RRD_MEMORY_MODE_SAVE_NAME;
     }
 }
 
-// ----------------------------------------------------------------------------
-// RRDSET index
+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;
 
-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);
+    return RRD_MEMORY_MODE_SAVE;
 }
 
-#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);
-}
+    else if(strcmp(name, RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME) == 0)
+        return RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL;
 
-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
+        return RRD_ALGORITHM_ABSOLUTE;
 }
 
-RRDSET *rrdset_index_del_name(RRDHOST *host, RRDSET *st) {
-    void *result;
-    // fprintf(stderr, "DELETING: %s (name: %s)\n", st->id, st->name);
-    result = (RRDSET *)avl_remove_lock(&((host)->rrdset_root_index_name), (avl *)(&st->avlname));
-    if(result) return rrdset_from_avlname(result);
-    return NULL;
-}
+const char *rrd_algorithm_name(RRD_ALGORITHM algorithm) {
+    switch(algorithm) {
+        case RRD_ALGORITHM_ABSOLUTE:
+        default:
+            return RRD_ALGORITHM_ABSOLUTE_NAME;
 
-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);
+        case RRD_ALGORITHM_INCREMENTAL:
+            return RRD_ALGORITHM_INCREMENTAL_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);
+        case RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL:
+            return RRD_ALGORITHM_PCENT_OVER_ROW_TOTAL_NAME;
 
-        // fprintf(stderr, "FOUND: %s\n", name);
-        return rrdset_from_avlname(result);
+        case RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL:
+            return RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL_NAME;
     }
-    // fprintf(stderr, "NOT FOUND: %s\n", name);
-    return NULL;
 }
 
 
 // ----------------------------------------------------------------------------
-// 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) (RRDDIM *)avl_insert_lock(&((st)->dimensions_index), (avl *)(rd))
-#define rrddim_index_del(st,rd ) (RRDDIM *)avl_remove_lock(&((st)->dimensions_index), (avl *)(rd))
+// RRD - chart types
 
-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);
+inline RRDSET_TYPE rrdset_type_id(const char *name) {
+    if(unlikely(strcmp(name, RRDSET_TYPE_AREA_NAME) == 0))
+        return RRDSET_TYPE_AREA;
 
-    return (RRDDIM *)avl_search_lock(&(st->dimensions_index), (avl *) &tmp);
-}
-
-// ----------------------------------------------------------------------------
-// chart types
+    else if(unlikely(strcmp(name, RRDSET_TYPE_STACKED_NAME) == 0))
+        return RRDSET_TYPE_STACKED;
 
-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;
+    else // if(unlikely(strcmp(name, RRDSET_TYPE_LINE_NAME) == 0))
+        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;
-
+const char *rrdset_type_name(RRDSET_TYPE chart_type) {
     switch(chart_type) {
         case RRDSET_TYPE_LINE:
-            return line;
+        default:
+            return RRDSET_TYPE_LINE_NAME;
 
         case RRDSET_TYPE_AREA:
-            return area;
+            return RRDSET_TYPE_AREA_NAME;
 
         case RRDSET_TYPE_STACKED:
-            return stacked;
+            return RRDSET_TYPE_STACKED_NAME;
     }
-    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;
-}
-
-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
-
-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;
-}
-
-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;
-
-    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;
-}
 
 // ----------------------------------------------------------------------------
-// chart names
+// RRD - cache directory
 
-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;
-    }
-
-    *p = '\0';
-
-    return to;
-}
-
-void rrdset_set_name(RRDSET *st, const char *name)
-{
-    if(unlikely(st->name && !strcmp(st->name, name)))
-        return;
-
-    debug(D_RRD_CALLS, "rrdset_set_name() old: %s, new: %s", st->name, 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);
-
-    if(st->name) {
-        rrdset_index_del_name(&localhost, st);
-        st->name = config_set_default(st->id, "name", b);
-        st->hash_name = simple_hash(st->name);
-        rrdsetvar_rename_all(st);
-    }
-    else {
-        st->name = config_get(st->id, "name", b);
-        st->hash_name = simple_hash(st->name);
-    }
-
-    pthread_rwlock_wrlock(&st->rwlock);
-    RRDDIM *rd;
-    for(rd = st->dimensions; rd ;rd = rd->next)
-        rrddimvar_rename_all(rd);
-    pthread_rwlock_unlock(&st->rwlock);
-
-    if(unlikely(rrdset_index_add_name(&localhost, st) != st))
-        error("RRDSET: INTERNAL ERROR: attempted to index duplicate chart name '%s'", st->name);
-}
-
-// ----------------------------------------------------------------------------
-// cache directory
-
-char *rrdset_cache_dir(const char *id)
-{
+char *rrdset_cache_dir(RRDHOST *host, const char *id, const char *config_section) {
     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);
+    snprintfz(n, FILENAME_MAX, "%s/%s", host->cache_dir, b);
+    ret = config_get(config_section, "cache directory", n);
 
-    if(rrd_memory_mode == RRD_MEMORY_MODE_MAP || rrd_memory_mode == RRD_MEMORY_MODE_SAVE) {
+    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);
@@ -415,1236 +136,3 @@ char *rrdset_cache_dir(const char *id)
 
     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;
-        memset(rd->values, 0, rd->entries * sizeof(storage_number));
-    }
-}
-static inline long align_entries_to_pagesize(long entries) {
-    if(entries < 5) entries = 5;
-    if(entries > RRD_HISTORY_ENTRIES_MAX) entries = RRD_HISTORY_ENTRIES_MAX;
-
-#ifdef NETDATA_LOG_ALLOCATIONS
-    long page = (size_t)sysconf(_SC_PAGESIZE);
-
-    long size = sizeof(RRDDIM) + entries * sizeof(storage_number);
-    if(size % page) {
-        size -= (size % page);
-        size += page;
-
-        long n = (size - sizeof(RRDDIM)) / sizeof(storage_number);
-        return n;
-    }
-
-    return entries;
-#else
-    return entries;
-#endif
-}
-
-static inline void timeval_align(struct timeval *tv, int update_every) {
-    tv->tv_sec -= tv->tv_sec % update_every;
-    tv->tv_usec = 500000;
-}
-
-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];
-
-    snprintfz(fullid, RRD_ID_LENGTH_MAX, "%s.%s", type, id);
-
-    RRDSET *st = rrdset_find(fullid);
-    if(st) {
-        error("Cannot create rrd stats for '%s', it already exists.", fullid);
-        return st;
-    }
-
-    long rentries = config_get_number(fullid, "history", rrd_default_history_entries);
-    long entries = align_entries_to_pagesize(rentries);
-    if(entries != rentries) entries = config_set_number(fullid, "history", entries);
-
-    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);
-            memset(st, 0, 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;
-            memset(st, 0, size);
-        }
-        else if(st->memsize != size || st->entries != entries) {
-            errno = 0;
-            error("File %s does not have the desired size. Clearing it.", fullfilename);
-            memset(st, 0, size);
-        }
-        else if(st->update_every != update_every) {
-            errno = 0;
-            error("File %s does not have the desired update frequency. Clearing it.", fullfilename);
-            memset(st, 0, size);
-        }
-        else if((now_realtime_sec() - st->last_updated.tv_sec) > update_every * entries) {
-            errno = 0;
-            error("File %s is too old. Clearing it.", fullfilename);
-            memset(st, 0, size);
-        }
-
-        // make sure the database is aligned
-        if(st->last_updated.tv_sec)
-            timeval_align(&st->last_updated, update_every);
-    }
-
-    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;
-        st->alarms = NULL;
-        memset(&st->rwlock, 0, sizeof(pthread_rwlock_t));
-        memset(&st->avl, 0, sizeof(avl));
-        memset(&st->avlname, 0, sizeof(avl));
-        memset(&st->variables_root_index, 0, sizeof(avl_tree_lock));
-        memset(&st->dimensions_index, 0, sizeof(avl_tree_lock));
-    }
-    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->units      = config_get(st->id, "units", units?units:"");
-
-    st->context    = config_get(st->id, "context", context?context:st->id);
-    st->hash_context = simple_hash(st->context);
-
-    st->priority = config_get_number(st->id, "priority", priority);
-    st->enabled = enabled;
-
-    st->isdetail = 0;
-    st->debug = 0;
-
-    // if(!strcmp(st->id, "disk_util.dm-0")) {
-    //     st->debug = 1;
-    //     error("enabled debugging for '%s'", st->id);
-    // }
-    // else error("not enabled debugging for '%s'", st->id);
-
-    st->green = NAN;
-    st->red = NAN;
-
-    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);
-    rrdhost_rwlock(&localhost);
-
-    if(name && *name) rrdset_set_name(st, name);
-    else rrdset_set_name(st, id);
-
-    {
-        char varvalue[CONFIG_MAX_VALUE + 1];
-        char varvalue2[CONFIG_MAX_VALUE + 1];
-        snprintfz(varvalue, CONFIG_MAX_VALUE, "%s (%s)", title?title:"", st->name);
-        json_escape_string(varvalue2, varvalue, sizeof(varvalue2));
-        st->title = config_get(st->id, "title", varvalue2);
-    }
-
-    st->rrdfamily = rrdfamily_create(st->family);
-    st->rrdhost = &localhost;
-
-    st->next = localhost.rrdset_root;
-    localhost.rrdset_root = st;
-
-    if(health_enabled) {
-        rrdsetvar_create(st, "last_collected_t", RRDVAR_TYPE_TIME_T, &st->last_collected_time.tv_sec, 0);
-        rrdsetvar_create(st, "collected_total_raw", RRDVAR_TYPE_TOTAL, &st->last_collected_total, 0);
-        rrdsetvar_create(st, "green", RRDVAR_TYPE_CALCULATED, &st->green, 0);
-        rrdsetvar_create(st, "red", RRDVAR_TYPE_CALCULATED, &st->red, 0);
-        rrdsetvar_create(st, "update_every", RRDVAR_TYPE_INT, &st->update_every, 0);
-    }
-
-    if(unlikely(rrdset_index_add(&localhost, st) != st))
-        error("RRDSET: INTERNAL ERROR: attempt to index duplicate chart '%s'", st->id);
-
-    rrdsetcalc_link_matching(st);
-    rrdcalctemplate_link_matching(st);
-
-    rrdhost_unlock(&localhost);
-
-    return(st);
-}
-
-RRDDIM *rrddim_add(RRDSET *st, const char *id, const char *name, long multiplier, long divisor, int algorithm)
-{
-    RRDDIM *rd = rrddim_find(st, id);
-    if(rd) {
-        debug(D_RRD_CALLS, "Cannot create rrd dimension '%s/%s', it already exists.", st->id, name?name:"<NONAME>");
-        return rd;
-    }
-
-    char filename[FILENAME_MAX + 1];
-    char fullfilename[FILENAME_MAX + 1];
-
-    char varname[CONFIG_MAX_NAME + 1];
-    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;
-        now_realtime_timeval(&now);
-
-        if(strcmp(rd->magic, RRDDIMENSION_MAGIC) != 0) {
-            errno = 0;
-            info("Initializing file %s.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(rd->memsize != size) {
-            errno = 0;
-            error("File %s does not have the desired size. Clearing it.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(rd->multiplier != multiplier) {
-            errno = 0;
-            error("File %s does not have the same multiplier. Clearing it.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(rd->divisor != divisor) {
-            errno = 0;
-            error("File %s does not have the same divisor. Clearing it.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(rd->algorithm != algorithm) {
-            errno = 0;
-            error("File %s does not have the same algorithm. Clearing it.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(rd->update_every != st->update_every) {
-            errno = 0;
-            error("File %s does not have the same refresh frequency. Clearing it.", fullfilename);
-            memset(rd, 0, size);
-        }
-        else if(dt_usec(&now, &rd->last_collected_time) > (rd->entries * rd->update_every * USEC_PER_SEC)) {
-            errno = 0;
-            error("File %s is too old. Clearing it.", fullfilename);
-            memset(rd, 0, 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;
-            memset(rd, 0, 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;
-        memset(&rd->avl, 0, sizeof(avl));
-    }
-    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->last_stored_value = 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;
-    }
-
-    if(health_enabled) {
-        rrddimvar_create(rd, RRDVAR_TYPE_CALCULATED, NULL, NULL, &rd->last_stored_value, 0);
-        rrddimvar_create(rd, RRDVAR_TYPE_COLLECTED, NULL, "_raw", &rd->last_collected_value, 0);
-        rrddimvar_create(rd, RRDVAR_TYPE_TIME_T, NULL, "_last_collected_t", &rd->last_collected_time.tv_sec, 0);
-    }
-
-    pthread_rwlock_unlock(&st->rwlock);
-
-    if(unlikely(rrddim_index_add(st, rd) != rd))
-        error("RRDDIM: INTERNAL ERROR: attempt to index duplicate dimension '%s' on chart '%s'", rd->id, st->id);
-
-    return(rd);
-}
-
-void rrddim_set_name(RRDSET *st, RRDDIM *rd, const char *name)
-{
-    if(unlikely(rd->name && !strcmp(rd->name, name)))
-        return;
-
-    debug(D_RRD_CALLS, "rrddim_set_name() from %s.%s to %s.%s", st->name, rd->name, st->name, name);
-
-    char varname[CONFIG_MAX_NAME + 1];
-    snprintfz(varname, CONFIG_MAX_NAME, "dim %s name", rd->id);
-    rd->name = 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);
-
-    if(rd == st->dimensions)
-        st->dimensions = rd->next;
-    else {
-        RRDDIM *i;
-        for (i = st->dimensions; i && i->next != rd; i = i->next) ;
-
-        if (i && i->next == rd)
-            i->next = rd->next;
-        else
-            error("Request to free dimension '%s.%s' but it is not linked.", st->id, rd->name);
-    }
-    rd->next = NULL;
-
-    while(rd->variables)
-        rrddimvar_free(rd->variables);
-
-    if(unlikely(rrddim_index_del(st, rd) != rd))
-        error("RRDDIM: INTERNAL ERROR: attempt to remove from index dimension '%s' on chart '%s', removed a different dimension.", rd->id, st->id);
-
-    // 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...");
-
-    rrdhost_rwlock(&localhost);
-
-    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->alarms)
-            rrdsetcalc_unlink(st->alarms);
-
-        while(st->dimensions)
-            rrddim_free(st, st->dimensions);
-
-        if(unlikely(rrdset_index_del(&localhost, st) != st))
-            error("RRDSET: INTERNAL ERROR: attempt to remove from index chart '%s', removed a different chart.", st->id);
-
-        rrdset_index_del_name(&localhost, st);
-
-        st->rrdfamily->use_count--;
-        if(!st->rrdfamily->use_count)
-            rrdfamily_free(st->rrdfamily);
-
-        pthread_rwlock_unlock(&st->rwlock);
-
-        if(st->mapped == RRD_MEMORY_MODE_SAVE || 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;
-
-    rrdhost_unlock(&localhost);
-
-    info("Memory cleanup completed...");
-}
-
-void rrdset_save_all(void) {
-    info("Saving database...");
-
-    RRDSET *st;
-    RRDDIM *rd;
-
-    // we get an write lock
-    // to ensure only one thread is saving the database
-    rrdhost_rwlock(&localhost);
-
-    for(st = localhost.rrdset_root; st ; st = st->next) {
-        pthread_rwlock_rdlock(&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);
-    }
-
-    rrdhost_unlock(&localhost);
-}
-
-
-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);
-
-    now_realtime_timeval(&rd->last_collected_time);
-    rd->collected_value = value;
-    rd->updated = 1;
-    rd->counter++;
-
-    // fprintf(stderr, "%s.%s %llu " COLLECTED_NUMBER_FORMAT " dt %0.6f" " rate " CALCULATED_NUMBER_FORMAT "\n", st->name, rd->name, st->usec_since_last_update, value, (float)((double)st->usec_since_last_update / (double)1000000), (calculated_number)((value - rd->last_collected_value) * (calculated_number)rd->multiplier / (calculated_number)rd->divisor * 1000000.0 / (calculated_number)st->usec_since_last_update));
-
-    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_unfiltered(RRDSET *st, usec_t microseconds)
-{
-    if(unlikely(!st->last_collected_time.tv_sec || !microseconds)) {
-        // the first entry
-        microseconds = st->update_every * USEC_PER_SEC;
-    }
-    st->usec_since_last_update = microseconds;
-}
-
-void rrdset_next_usec(RRDSET *st, usec_t microseconds)
-{
-    struct timeval now;
-    now_realtime_timeval(&now);
-
-    if(unlikely(!st->last_collected_time.tv_sec)) {
-        // the first entry
-        microseconds = st->update_every * USEC_PER_SEC;
-    }
-    else if(unlikely(!microseconds)) {
-        // no dt given by the plugin
-        microseconds = dt_usec(&now, &st->last_collected_time);
-    }
-    else {
-        // microseconds has the time since the last collection
-        usec_t now_usec = timeval_usec(&now);
-        usec_t last_usec = timeval_usec(&st->last_collected_time);
-        usec_t since_last_usec = dt_usec(&now, &st->last_collected_time);
-
-        // verify the microseconds given is good
-        if(unlikely(microseconds > since_last_usec)) {
-            debug(D_RRD_CALLS, "dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
-
-#ifdef NETDATA_INTERNAL_CHECKS
-            if(unlikely(last_usec + microseconds > now_usec + 1000))
-                error("dt %llu usec given is too big - it leads %llu usec to the future, for chart '%s' (%s).", microseconds, microseconds - since_last_usec, st->name, st->id);
-#endif
-
-            microseconds = since_last_usec;
-        }
-        else if(unlikely(microseconds < since_last_usec * 0.8)) {
-            debug(D_RRD_CALLS, "dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
-
-#ifdef NETDATA_INTERNAL_CHECKS
-            error("dt %llu usec given is too small - expected %llu usec up to -20%%, for chart '%s' (%s).", microseconds, since_last_usec, st->name, st->id);
-#endif
-            microseconds = since_last_usec;
-        }
-    }
-    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;
-}
-
-usec_t rrdset_done(RRDSET *st)
-{
-    if(unlikely(netdata_exit)) return 0;
-
-    debug(D_RRD_CALLS, "rrdset_done() for chart %s", st->name);
-
-    RRDDIM *rd;
-
-    int
-        pthreadoldcancelstate;  // store the old cancelable pthread state, to restore it at the end
-
-    char
-        store_this_entry = 1,   // boolean: 1 = store this entry, 0 = don't store this entry
-        first_entry = 0;        // boolean: 1 = this is the first entry seen for this chart, 0 = all other entries
-
-    unsigned int
-        stored_entries = 0;     // the number of entries we have stored in the db, during this call to rrdset_done()
-
-    usec_t
-        last_collect_ut,        // the timestamp in microseconds, of the last collected value
-        now_collect_ut,         // the timestamp in microseconds, of this collected value (this is NOW)
-        last_stored_ut,         // the timestamp in microseconds, of the last stored entry in the db
-        next_store_ut,          // the timestamp in microseconds, of the next entry to store in the db
-        update_every_ut = st->update_every * USEC_PER_SEC; // st->update_every in microseconds
-
-    if(unlikely(pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &pthreadoldcancelstate) != 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 * update_every_ut)) {
-        info("%s: took too long to be updated (%0.3Lf secs). Resetting it.", st->name, (long double)(st->usec_since_last_update / 1000000.0));
-        rrdset_reset(st);
-        st->usec_since_last_update = update_every_ut;
-        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
-        now_realtime_timeval(&st->last_collected_time);
-        timeval_align(&st->last_collected_time, st->update_every);
-
-        last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - update_every_ut;
-
-        // 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
-        last_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
-        usec_t ut = last_collect_ut + st->usec_since_last_update;
-        st->last_collected_time.tv_sec = (time_t) (ut / USEC_PER_SEC);
-        st->last_collected_time.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
-    }
-
-    // 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
-        usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
-        st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
-        st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
-
-        // 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(dt_usec(&st->last_collected_time, &st->last_updated) > st->entries * update_every_ut)) {
-        info("%s: too old data (last updated at %ld.%ld, last collected at %ld.%ld). Resetting 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 = update_every_ut;
-
-        now_realtime_timeval(&st->last_collected_time);
-        timeval_align(&st->last_collected_time, st->update_every);
-
-        usec_t ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec - st->usec_since_last_update;
-        st->last_updated.tv_sec = (time_t) (ut / USEC_PER_SEC);
-        st->last_updated.tv_usec = (suseconds_t) (ut % USEC_PER_SEC);
-
-        // 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_stored_ut = the last time we added a value to the storage
-    // now_collect_ut = the time the current value has been collected
-    // next_store_ut  = the time of the next interpolation point
-    last_stored_ut = st->last_updated.tv_sec * USEC_PER_SEC + st->last_updated.tv_usec;
-    now_collect_ut = st->last_collected_time.tv_sec * USEC_PER_SEC + st->last_collected_time.tv_usec;
-    next_store_ut  = (st->last_updated.tv_sec + st->update_every) * USEC_PER_SEC;
-
-    if(unlikely(st->debug)) {
-        debug(D_RRD_STATS, "%s: last_collect_ut = %0.3Lf (last collection time)", st->name, (long double)last_collect_ut/1000000.0);
-        debug(D_RRD_STATS, "%s: now_collect_ut  = %0.3Lf (current collection time)", st->name, (long double)now_collect_ut/1000000.0);
-        debug(D_RRD_STATS, "%s: last_stored_ut  = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
-        debug(D_RRD_STATS, "%s: next_store_ut   = %0.3Lf (next interpolation point)", st->name, (long double)next_store_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 ; 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 ; 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
-
-    if(unlikely(now_collect_ut < next_store_ut)) {
-        // this is collected in the same interpolation point
-        if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS IN THE SAME INTERPOLATION POINT", st->name);
-#ifdef NETDATA_INTERNAL_CHECKS
-        info("%s is collected in the same interpolation point: short by %llu microseconds", st->name, next_store_ut - now_collect_ut);
-#endif
-    }
-
-    usec_t first_ut = last_stored_ut;
-    long long iterations = (now_collect_ut - last_stored_ut) / (update_every_ut);
-    if((now_collect_ut % (update_every_ut)) == 0) iterations++;
-
-    for( ; next_store_ut <= now_collect_ut ; last_collect_ut = next_store_ut, next_store_ut += update_every_ut, iterations-- ) {
-#ifdef NETDATA_INTERNAL_CHECKS
-        if(iterations < 0) { error("%s: iterations calculation wrapped! first_ut = %llu, last_stored_ut = %llu, next_store_ut = %llu, now_collect_ut = %llu", st->name, first_ut, last_stored_ut, next_store_ut, now_collect_ut); }
-#endif
-
-        if(unlikely(st->debug)) {
-            debug(D_RRD_STATS, "%s: last_stored_ut = %0.3Lf (last updated time)", st->name, (long double)last_stored_ut/1000000.0);
-            debug(D_RRD_STATS, "%s: next_store_ut  = %0.3Lf (next interpolation point)", st->name, (long double)next_store_ut/1000000.0);
-        }
-
-        st->last_updated.tv_sec = (time_t) (next_store_ut / USEC_PER_SEC);
-        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_store_ut - last_collect_ut)
-                            / (calculated_number)(now_collect_ut - last_collect_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_store_ut - last_stored_ut)
-                            , (now_collect_ut - last_stored_ut)
-                            );
-
-                    rd->calculated_value -= new_value;
-                    new_value += rd->last_calculated_value;
-                    rd->last_calculated_value = 0;
-                    new_value /= (calculated_number)st->update_every;
-
-                    if(unlikely(next_store_ut - last_stored_ut < update_every_ut)) {
-                        if(unlikely(st->debug))
-                            debug(D_RRD_STATS, "%s/%s: COLLECTION POINT IS SHORT " CALCULATED_NUMBER_FORMAT " - EXTRAPOLATING",
-                                st->id, rd->name
-                                , (calculated_number)(next_store_ut - last_stored_ut)
-                                );
-                        new_value = new_value * (calculated_number)(st->update_every * 1000000) / (calculated_number)(next_store_ut - last_stored_ut);
-                    }
-                    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_store_ut - last_collect_ut)
-                                    / (calculated_number)(now_collect_ut - last_collect_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_store_ut - first_ut)
-                                , (now_collect_ut - first_ut), rd->last_calculated_value
-                                );
-                    }
-                    break;
-            }
-
-            if(unlikely(!store_this_entry)) {
-                rd->values[st->current_entry] = pack_storage_number(0, SN_NOT_EXISTS);
-                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 );
-                rd->last_stored_value = new_value;
-
-                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);
-                rd->last_stored_value = NAN;
-            }
-
-            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_stored_ut = next_store_ut;
-    }
-
-    st->last_collected_total  = st->collected_total;
-
-    for( rd = st->dimensions; rd ; rd = rd->next ) {
-        if(unlikely(!rd->updated)) continue;
-
-        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;
-
-        switch(rd->algorithm) {
-            case RRDDIM_INCREMENTAL:
-                if(unlikely(!first_entry)) {
-                    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->calculated_value);
-                    rd->last_calculated_value += rd->calculated_value;
-                }
-                else {
-                    if(unlikely(st->debug)) debug(D_RRD_STATS, "%s: THIS IS THE FIRST POINT", st->name);
-                }
-                break;
-
-            case RRDDIM_ABSOLUTE:
-            case RRDDIM_PCENT_OVER_ROW_TOTAL:
-            case RRDDIM_PCENT_OVER_DIFF_TOTAL:
-                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;
-                break;
-        }
-
-        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)) {
-            RRDDIM *last;
-            // 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(pthreadoldcancelstate, NULL) != 0))
-        error("Cannot set pthread cancel state to RESTORE (%d).", pthreadoldcancelstate);
-
-    return(st->usec_since_last_update);
-}