Adding upstream version 1.29.3.upstream/1.29.3upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 950 insertions, 0 deletions

diff --git a/daemon/global_statistics.c b/daemon/global_statistics.c
new file mode 100644
index 0000000..7e78355
--- /dev/null
+++ b/daemon/global_statistics.c
@@ -0,0 +1,950 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "common.h"
+
+#define GLOBAL_STATS_RESET_WEB_USEC_MAX 0x01
+
+
+static struct global_statistics {
+    volatile uint16_t connected_clients;
+
+    volatile uint64_t web_requests;
+    volatile uint64_t web_usec;
+    volatile uint64_t web_usec_max;
+    volatile uint64_t bytes_received;
+    volatile uint64_t bytes_sent;
+    volatile uint64_t content_size;
+    volatile uint64_t compressed_content_size;
+
+    volatile uint64_t web_client_count;
+
+    volatile uint64_t rrdr_queries_made;
+    volatile uint64_t rrdr_db_points_read;
+    volatile uint64_t rrdr_result_points_generated;
+} global_statistics = {
+        .connected_clients = 0,
+        .web_requests = 0,
+        .web_usec = 0,
+        .bytes_received = 0,
+        .bytes_sent = 0,
+        .content_size = 0,
+        .compressed_content_size = 0,
+        .web_client_count = 1,
+
+        .rrdr_queries_made = 0,
+        .rrdr_db_points_read = 0,
+        .rrdr_result_points_generated = 0,
+};
+
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+#else
+netdata_mutex_t global_statistics_mutex = NETDATA_MUTEX_INITIALIZER;
+
+static inline void global_statistics_lock(void) {
+    netdata_mutex_lock(&global_statistics_mutex);
+}
+
+static inline void global_statistics_unlock(void) {
+    netdata_mutex_unlock(&global_statistics_mutex);
+}
+#endif
+
+
+void rrdr_query_completed(uint64_t db_points_read, uint64_t result_points_generated) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+    __atomic_fetch_add(&global_statistics.rrdr_queries_made, 1, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.rrdr_db_points_read, db_points_read, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.rrdr_result_points_generated, result_points_generated, __ATOMIC_SEQ_CST);
+#else
+    #warning NOT using atomic operations - using locks for global statistics
+    if (web_server_is_multithreaded)
+        global_statistics_lock();
+
+    global_statistics.rrdr_queries_made++;
+    global_statistics.rrdr_db_points_read += db_points_read;
+    global_statistics.rrdr_result_points_generated += result_points_generated;
+
+    if (web_server_is_multithreaded)
+        global_statistics_unlock();
+#endif
+}
+
+void finished_web_request_statistics(uint64_t dt,
+                                     uint64_t bytes_received,
+                                     uint64_t bytes_sent,
+                                     uint64_t content_size,
+                                     uint64_t compressed_content_size) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+    uint64_t old_web_usec_max = global_statistics.web_usec_max;
+    while(dt > old_web_usec_max)
+        __atomic_compare_exchange(&global_statistics.web_usec_max, &old_web_usec_max, &dt, 1, __ATOMIC_SEQ_CST, __ATOMIC_SEQ_CST);
+
+    __atomic_fetch_add(&global_statistics.web_requests, 1, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.web_usec, dt, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.bytes_received, bytes_received, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.bytes_sent, bytes_sent, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.content_size, content_size, __ATOMIC_SEQ_CST);
+    __atomic_fetch_add(&global_statistics.compressed_content_size, compressed_content_size, __ATOMIC_SEQ_CST);
+#else
+#warning NOT using atomic operations - using locks for global statistics
+    if (web_server_is_multithreaded)
+        global_statistics_lock();
+
+    if (dt > global_statistics.web_usec_max)
+        global_statistics.web_usec_max = dt;
+
+    global_statistics.web_requests++;
+    global_statistics.web_usec += dt;
+    global_statistics.bytes_received += bytes_received;
+    global_statistics.bytes_sent += bytes_sent;
+    global_statistics.content_size += content_size;
+    global_statistics.compressed_content_size += compressed_content_size;
+
+    if (web_server_is_multithreaded)
+        global_statistics_unlock();
+#endif
+}
+
+uint64_t web_client_connected(void) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+    __atomic_fetch_add(&global_statistics.connected_clients, 1, __ATOMIC_SEQ_CST);
+    uint64_t id = __atomic_fetch_add(&global_statistics.web_client_count, 1, __ATOMIC_SEQ_CST);
+#else
+    if (web_server_is_multithreaded)
+        global_statistics_lock();
+
+    global_statistics.connected_clients++;
+    uint64_t id = global_statistics.web_client_count++;
+
+    if (web_server_is_multithreaded)
+        global_statistics_unlock();
+#endif
+
+    return id;
+}
+
+void web_client_disconnected(void) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+    __atomic_fetch_sub(&global_statistics.connected_clients, 1, __ATOMIC_SEQ_CST);
+#else
+    if (web_server_is_multithreaded)
+        global_statistics_lock();
+
+    global_statistics.connected_clients--;
+
+    if (web_server_is_multithreaded)
+        global_statistics_unlock();
+#endif
+}
+
+
+static inline void global_statistics_copy(struct global_statistics *gs, uint8_t options) {
+#if defined(HAVE_C___ATOMIC) && !defined(NETDATA_NO_ATOMIC_INSTRUCTIONS)
+    gs->connected_clients            = __atomic_fetch_add(&global_statistics.connected_clients, 0, __ATOMIC_SEQ_CST);
+    gs->web_requests                 = __atomic_fetch_add(&global_statistics.web_requests, 0, __ATOMIC_SEQ_CST);
+    gs->web_usec                     = __atomic_fetch_add(&global_statistics.web_usec, 0, __ATOMIC_SEQ_CST);
+    gs->web_usec_max                 = __atomic_fetch_add(&global_statistics.web_usec_max, 0, __ATOMIC_SEQ_CST);
+    gs->bytes_received               = __atomic_fetch_add(&global_statistics.bytes_received, 0, __ATOMIC_SEQ_CST);
+    gs->bytes_sent                   = __atomic_fetch_add(&global_statistics.bytes_sent, 0, __ATOMIC_SEQ_CST);
+    gs->content_size                 = __atomic_fetch_add(&global_statistics.content_size, 0, __ATOMIC_SEQ_CST);
+    gs->compressed_content_size      = __atomic_fetch_add(&global_statistics.compressed_content_size, 0, __ATOMIC_SEQ_CST);
+    gs->web_client_count             = __atomic_fetch_add(&global_statistics.web_client_count, 0, __ATOMIC_SEQ_CST);
+
+    gs->rrdr_queries_made            = __atomic_fetch_add(&global_statistics.rrdr_queries_made, 0, __ATOMIC_SEQ_CST);
+    gs->rrdr_db_points_read          = __atomic_fetch_add(&global_statistics.rrdr_db_points_read, 0, __ATOMIC_SEQ_CST);
+    gs->rrdr_result_points_generated = __atomic_fetch_add(&global_statistics.rrdr_result_points_generated, 0, __ATOMIC_SEQ_CST);
+
+    if(options & GLOBAL_STATS_RESET_WEB_USEC_MAX) {
+        uint64_t n = 0;
+        __atomic_compare_exchange(&global_statistics.web_usec_max, &gs->web_usec_max, &n, 1, __ATOMIC_SEQ_CST,
+                                  __ATOMIC_SEQ_CST);
+    }
+#else
+    global_statistics_lock();
+
+    memcpy(gs, (const void *)&global_statistics, sizeof(struct global_statistics));
+
+    if (options & GLOBAL_STATS_RESET_WEB_USEC_MAX)
+        global_statistics.web_usec_max = 0;
+
+    global_statistics_unlock();
+#endif
+}
+
+void global_statistics_charts(void) {
+    static unsigned long long old_web_requests = 0,
+                              old_web_usec = 0,
+                              old_content_size = 0,
+                              old_compressed_content_size = 0;
+
+    static collected_number compression_ratio = -1,
+                            average_response_time = -1;
+
+    struct global_statistics gs;
+    struct rusage me, thread;
+
+    global_statistics_copy(&gs, GLOBAL_STATS_RESET_WEB_USEC_MAX);
+    getrusage(RUSAGE_THREAD, &thread);
+    getrusage(RUSAGE_SELF, &me);
+
+    {
+        static RRDSET *st_cpu_thread = NULL;
+        static RRDDIM *rd_cpu_thread_user = NULL,
+                      *rd_cpu_thread_system = NULL;
+
+#ifdef __FreeBSD__
+        if (unlikely(!st_cpu_thread)) {
+            st_cpu_thread = rrdset_create_localhost(
+                    "netdata"
+                    , "plugin_freebsd_cpu"
+                    , NULL
+                    , "freebsd"
+                    , NULL
+                    , "NetData FreeBSD Plugin CPU usage"
+                    , "milliseconds/s"
+                    , "netdata"
+                    , "stats"
+                    , 132000
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_STACKED
+            );
+#else
+        if (unlikely(!st_cpu_thread)) {
+            st_cpu_thread = rrdset_create_localhost(
+                    "netdata"
+                    , "plugin_proc_cpu"
+                    , NULL
+                    , "proc"
+                    , NULL
+                    , "NetData Proc Plugin CPU usage"
+                    , "milliseconds/s"
+                    , "netdata"
+                    , "stats"
+                    , 132000
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_STACKED
+            );
+#endif
+
+            rd_cpu_thread_user   = rrddim_add(st_cpu_thread, "user",   NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+            rd_cpu_thread_system = rrddim_add(st_cpu_thread, "system", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_cpu_thread);
+
+        rrddim_set_by_pointer(st_cpu_thread, rd_cpu_thread_user,   thread.ru_utime.tv_sec * 1000000ULL + thread.ru_utime.tv_usec);
+        rrddim_set_by_pointer(st_cpu_thread, rd_cpu_thread_system, thread.ru_stime.tv_sec * 1000000ULL + thread.ru_stime.tv_usec);
+        rrdset_done(st_cpu_thread);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_cpu = NULL;
+        static RRDDIM *rd_cpu_user   = NULL,
+                      *rd_cpu_system = NULL;
+
+        if (unlikely(!st_cpu)) {
+            st_cpu = rrdset_create_localhost(
+                    "netdata"
+                    , "server_cpu"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData CPU usage"
+                    , "milliseconds/s"
+                    , "netdata"
+                    , "stats"
+                    , 130000
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_STACKED
+            );
+
+            rd_cpu_user   = rrddim_add(st_cpu, "user",   NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+            rd_cpu_system = rrddim_add(st_cpu, "system", NULL, 1, 1000, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_cpu);
+
+        rrddim_set_by_pointer(st_cpu, rd_cpu_user,   me.ru_utime.tv_sec * 1000000ULL + me.ru_utime.tv_usec);
+        rrddim_set_by_pointer(st_cpu, rd_cpu_system, me.ru_stime.tv_sec * 1000000ULL + me.ru_stime.tv_usec);
+        rrdset_done(st_cpu);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_clients = NULL;
+        static RRDDIM *rd_clients = NULL;
+
+        if (unlikely(!st_clients)) {
+            st_clients = rrdset_create_localhost(
+                    "netdata"
+                    , "clients"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData Web Clients"
+                    , "connected clients"
+                    , "netdata"
+                    , "stats"
+                    , 130200
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_clients = rrddim_add(st_clients, "clients", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+        }
+        else
+            rrdset_next(st_clients);
+
+        rrddim_set_by_pointer(st_clients, rd_clients, gs.connected_clients);
+        rrdset_done(st_clients);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_reqs = NULL;
+        static RRDDIM *rd_requests = NULL;
+
+        if (unlikely(!st_reqs)) {
+            st_reqs = rrdset_create_localhost(
+                    "netdata"
+                    , "requests"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData Web Requests"
+                    , "requests/s"
+                    , "netdata"
+                    , "stats"
+                    , 130300
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_requests = rrddim_add(st_reqs, "requests", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_reqs);
+
+        rrddim_set_by_pointer(st_reqs, rd_requests, (collected_number) gs.web_requests);
+        rrdset_done(st_reqs);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_bytes = NULL;
+        static RRDDIM *rd_in = NULL,
+                      *rd_out = NULL;
+
+        if (unlikely(!st_bytes)) {
+            st_bytes = rrdset_create_localhost(
+                    "netdata"
+                    , "net"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData Network Traffic"
+                    , "kilobits/s"
+                    , "netdata"
+                    , "stats"
+                    , 130000
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_AREA
+            );
+
+            rd_in  = rrddim_add(st_bytes, "in",  NULL,  8, BITS_IN_A_KILOBIT, RRD_ALGORITHM_INCREMENTAL);
+            rd_out = rrddim_add(st_bytes, "out", NULL, -8, BITS_IN_A_KILOBIT, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_bytes);
+
+        rrddim_set_by_pointer(st_bytes, rd_in, (collected_number) gs.bytes_received);
+        rrddim_set_by_pointer(st_bytes, rd_out, (collected_number) gs.bytes_sent);
+        rrdset_done(st_bytes);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_duration = NULL;
+        static RRDDIM *rd_average = NULL,
+                      *rd_max     = NULL;
+
+        if (unlikely(!st_duration)) {
+            st_duration = rrdset_create_localhost(
+                    "netdata"
+                    , "response_time"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData API Response Time"
+                    , "milliseconds/request"
+                    , "netdata"
+                    , "stats"
+                    , 130400
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_average = rrddim_add(st_duration, "average", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+            rd_max = rrddim_add(st_duration, "max", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+        }
+        else
+            rrdset_next(st_duration);
+
+        uint64_t gweb_usec = gs.web_usec;
+        uint64_t gweb_requests = gs.web_requests;
+
+        uint64_t web_usec = (gweb_usec >= old_web_usec) ? gweb_usec - old_web_usec : 0;
+        uint64_t web_requests = (gweb_requests >= old_web_requests) ? gweb_requests - old_web_requests : 0;
+
+        old_web_usec = gweb_usec;
+        old_web_requests = gweb_requests;
+
+        if (web_requests)
+            average_response_time = (collected_number) (web_usec / web_requests);
+
+        if (unlikely(average_response_time != -1))
+            rrddim_set_by_pointer(st_duration, rd_average, average_response_time);
+        else
+            rrddim_set_by_pointer(st_duration, rd_average, 0);
+
+        rrddim_set_by_pointer(st_duration, rd_max, ((gs.web_usec_max)?(collected_number)gs.web_usec_max:average_response_time));
+        rrdset_done(st_duration);
+    }
+
+    // ----------------------------------------------------------------
+
+    {
+        static RRDSET *st_compression = NULL;
+        static RRDDIM *rd_savings = NULL;
+
+        if (unlikely(!st_compression)) {
+            st_compression = rrdset_create_localhost(
+                    "netdata"
+                    , "compression_ratio"
+                    , NULL
+                    , "netdata"
+                    , NULL
+                    , "NetData API Responses Compression Savings Ratio"
+                    , "percentage"
+                    , "netdata"
+                    , "stats"
+                    , 130500
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_savings = rrddim_add(st_compression, "savings", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+        }
+        else
+            rrdset_next(st_compression);
+
+        // since we don't lock here to read the global statistics
+        // read the smaller value first
+        unsigned long long gcompressed_content_size = gs.compressed_content_size;
+        unsigned long long gcontent_size = gs.content_size;
+
+        unsigned long long compressed_content_size = gcompressed_content_size - old_compressed_content_size;
+        unsigned long long content_size = gcontent_size - old_content_size;
+
+        old_compressed_content_size = gcompressed_content_size;
+        old_content_size = gcontent_size;
+
+        if (content_size && content_size >= compressed_content_size)
+            compression_ratio = ((content_size - compressed_content_size) * 100 * 1000) / content_size;
+
+        if (compression_ratio != -1)
+            rrddim_set_by_pointer(st_compression, rd_savings, compression_ratio);
+
+        rrdset_done(st_compression);
+    }
+
+    // ----------------------------------------------------------------
+
+    if(gs.rrdr_queries_made) {
+        static RRDSET *st_rrdr_queries = NULL;
+        static RRDDIM *rd_queries = NULL;
+
+        if (unlikely(!st_rrdr_queries)) {
+            st_rrdr_queries = rrdset_create_localhost(
+                    "netdata"
+                    , "queries"
+                    , NULL
+                    , "queries"
+                    , NULL
+                    , "NetData API Queries"
+                    , "queries/s"
+                    , "netdata"
+                    , "stats"
+                    , 130500
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_LINE
+            );
+
+            rd_queries = rrddim_add(st_rrdr_queries, "queries", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_rrdr_queries);
+
+        rrddim_set_by_pointer(st_rrdr_queries, rd_queries, (collected_number)gs.rrdr_queries_made);
+
+        rrdset_done(st_rrdr_queries);
+    }
+
+    // ----------------------------------------------------------------
+
+    if(gs.rrdr_db_points_read || gs.rrdr_result_points_generated) {
+        static RRDSET *st_rrdr_points = NULL;
+        static RRDDIM *rd_points_read = NULL;
+        static RRDDIM *rd_points_generated = NULL;
+
+        if (unlikely(!st_rrdr_points)) {
+            st_rrdr_points = rrdset_create_localhost(
+                    "netdata"
+                    , "db_points"
+                    , NULL
+                    , "queries"
+                    , NULL
+                    , "NetData API Points"
+                    , "points/s"
+                    , "netdata"
+                    , "stats"
+                    , 130501
+                    , localhost->rrd_update_every
+                    , RRDSET_TYPE_AREA
+            );
+
+            rd_points_read = rrddim_add(st_rrdr_points, "read", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+            rd_points_generated = rrddim_add(st_rrdr_points, "generated", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
+        }
+        else
+            rrdset_next(st_rrdr_points);
+
+        rrddim_set_by_pointer(st_rrdr_points, rd_points_read, (collected_number)gs.rrdr_db_points_read);
+        rrddim_set_by_pointer(st_rrdr_points, rd_points_generated, (collected_number)gs.rrdr_result_points_generated);
+
+        rrdset_done(st_rrdr_points);
+    }
+
+    // ----------------------------------------------------------------
+
+#ifdef ENABLE_DBENGINE
+    RRDHOST *host;
+    unsigned long long stats_array[RRDENG_NR_STATS] = {0};
+    unsigned long long local_stats_array[RRDENG_NR_STATS];
+    unsigned dbengine_contexts = 0, counted_multihost_db = 0, i;
+
+    rrd_rdlock();
+    rrdhost_foreach_read(host) {
+        if (host->rrd_memory_mode == RRD_MEMORY_MODE_DBENGINE && !rrdhost_flag_check(host, RRDHOST_FLAG_ARCHIVED)) {
+            if (&multidb_ctx == host->rrdeng_ctx) {
+                if (counted_multihost_db)
+                    continue; /* Only count multi-host DB once */
+                counted_multihost_db = 1;
+            }
+            ++dbengine_contexts;
+            /* get localhost's DB engine's statistics */
+            rrdeng_get_37_statistics(host->rrdeng_ctx, local_stats_array);
+            for (i = 0 ; i < RRDENG_NR_STATS ; ++i) {
+                /* aggregate statistics across hosts */
+                stats_array[i] += local_stats_array[i];
+            }
+        }
+    }
+    rrd_unlock();
+
+    if (dbengine_contexts) {
+        /* deduplicate global statistics by getting the ones from the last context */
+        stats_array[30] = local_stats_array[30];
+        stats_array[31] = local_stats_array[31];
+        stats_array[32] = local_stats_array[32];
+        stats_array[34] = local_stats_array[34];
+        stats_array[36] = local_stats_array[36];
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_compression = NULL;
+            static RRDDIM *rd_savings = NULL;
+
+            if (unlikely(!st_compression)) {
+                st_compression = rrdset_create_localhost(
+                        "netdata"
+                        , "dbengine_compression_ratio"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData DB engine data extents' compression savings ratio"
+                        , "percentage"
+                        , "netdata"
+                        , "stats"
+                        , 130502
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_savings = rrddim_add(st_compression, "savings", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(st_compression);
+
+            unsigned long long ratio;
+            unsigned long long compressed_content_size = stats_array[12];
+            unsigned long long content_size = stats_array[11];
+
+            if (content_size) {
+                // allow negative savings
+                ratio = ((content_size - compressed_content_size) * 100 * 1000) / content_size;
+            } else {
+                ratio = 0;
+            }
+            rrddim_set_by_pointer(st_compression, rd_savings, ratio);
+
+            rrdset_done(st_compression);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_pg_cache_hit_ratio = NULL;
+            static RRDDIM *rd_hit_ratio = NULL;
+
+            if (unlikely(!st_pg_cache_hit_ratio)) {
+                st_pg_cache_hit_ratio = rrdset_create_localhost(
+                        "netdata"
+                        , "page_cache_hit_ratio"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData DB engine page cache hit ratio"
+                        , "percentage"
+                        , "netdata"
+                        , "stats"
+                        , 130503
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_hit_ratio = rrddim_add(st_pg_cache_hit_ratio, "ratio", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(st_pg_cache_hit_ratio);
+
+            static unsigned long long old_hits = 0;
+            static unsigned long long old_misses = 0;
+            unsigned long long hits = stats_array[7];
+            unsigned long long misses = stats_array[8];
+            unsigned long long hits_delta;
+            unsigned long long misses_delta;
+            unsigned long long ratio;
+
+            hits_delta = hits - old_hits;
+            misses_delta = misses - old_misses;
+            old_hits = hits;
+            old_misses = misses;
+
+            if (hits_delta + misses_delta) {
+                ratio = (hits_delta * 100 * 1000) / (hits_delta + misses_delta);
+            } else {
+                ratio = 0;
+            }
+            rrddim_set_by_pointer(st_pg_cache_hit_ratio, rd_hit_ratio, ratio);
+
+            rrdset_done(st_pg_cache_hit_ratio);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_pg_cache_pages = NULL;
+            static RRDDIM *rd_descriptors = NULL;
+            static RRDDIM *rd_populated = NULL;
+            static RRDDIM *rd_dirty = NULL;
+            static RRDDIM *rd_backfills = NULL;
+            static RRDDIM *rd_evictions = NULL;
+            static RRDDIM *rd_used_by_collectors = NULL;
+
+            if (unlikely(!st_pg_cache_pages)) {
+                st_pg_cache_pages = rrdset_create_localhost(
+                        "netdata"
+                        , "page_cache_stats"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData dbengine page cache statistics"
+                        , "pages"
+                        , "netdata"
+                        , "stats"
+                        , 130504
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_descriptors = rrddim_add(st_pg_cache_pages, "descriptors", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                rd_populated = rrddim_add(st_pg_cache_pages, "populated", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                rd_dirty = rrddim_add(st_pg_cache_pages, "dirty", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                rd_backfills = rrddim_add(st_pg_cache_pages, "backfills", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_evictions = rrddim_add(st_pg_cache_pages, "evictions", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_used_by_collectors = rrddim_add(st_pg_cache_pages, "used_by_collectors", NULL, 1, 1,
+                                                   RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(st_pg_cache_pages);
+
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_descriptors, (collected_number)stats_array[27]);
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_populated, (collected_number)stats_array[3]);
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_dirty, (collected_number)stats_array[0] + stats_array[4]);
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_backfills, (collected_number)stats_array[9]);
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_evictions, (collected_number)stats_array[10]);
+            rrddim_set_by_pointer(st_pg_cache_pages, rd_used_by_collectors, (collected_number)stats_array[0]);
+            rrdset_done(st_pg_cache_pages);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_long_term_pages = NULL;
+            static RRDDIM *rd_total = NULL;
+            static RRDDIM *rd_insertions = NULL;
+            static RRDDIM *rd_deletions = NULL;
+            static RRDDIM *rd_flushing_pressure_deletions = NULL;
+
+            if (unlikely(!st_long_term_pages)) {
+                st_long_term_pages = rrdset_create_localhost(
+                        "netdata"
+                , "dbengine_long_term_page_stats"
+                , NULL
+                , "dbengine"
+                , NULL
+                , "NetData dbengine long-term page statistics"
+                , "pages"
+                , "netdata"
+                , "stats"
+                , 130505
+                , localhost->rrd_update_every
+                , RRDSET_TYPE_LINE
+                );
+
+                rd_total = rrddim_add(st_long_term_pages, "total", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                rd_insertions = rrddim_add(st_long_term_pages, "insertions", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_deletions = rrddim_add(st_long_term_pages, "deletions", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_flushing_pressure_deletions = rrddim_add(st_long_term_pages, "flushing_pressure_deletions", NULL, -1,
+                                                            1, RRD_ALGORITHM_INCREMENTAL);
+            }
+            else
+                rrdset_next(st_long_term_pages);
+
+            rrddim_set_by_pointer(st_long_term_pages, rd_total, (collected_number)stats_array[2]);
+            rrddim_set_by_pointer(st_long_term_pages, rd_insertions, (collected_number)stats_array[5]);
+            rrddim_set_by_pointer(st_long_term_pages, rd_deletions, (collected_number)stats_array[6]);
+            rrddim_set_by_pointer(st_long_term_pages, rd_flushing_pressure_deletions,
+                                  (collected_number)stats_array[36]);
+            rrdset_done(st_long_term_pages);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_io_stats = NULL;
+            static RRDDIM *rd_reads = NULL;
+            static RRDDIM *rd_writes = NULL;
+
+            if (unlikely(!st_io_stats)) {
+                st_io_stats = rrdset_create_localhost(
+                "netdata"
+                , "dbengine_io_throughput"
+                , NULL
+                , "dbengine"
+                , NULL
+                , "NetData DB engine I/O throughput"
+                , "MiB/s"
+                , "netdata"
+                , "stats"
+                , 130506
+                , localhost->rrd_update_every
+                , RRDSET_TYPE_LINE
+                );
+
+                rd_reads = rrddim_add(st_io_stats, "reads", NULL, 1, 1024 * 1024, RRD_ALGORITHM_INCREMENTAL);
+                rd_writes = rrddim_add(st_io_stats, "writes", NULL, -1, 1024 * 1024, RRD_ALGORITHM_INCREMENTAL);
+            }
+            else
+                rrdset_next(st_io_stats);
+
+            rrddim_set_by_pointer(st_io_stats, rd_reads, (collected_number)stats_array[17]);
+            rrddim_set_by_pointer(st_io_stats, rd_writes, (collected_number)stats_array[15]);
+            rrdset_done(st_io_stats);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_io_stats = NULL;
+            static RRDDIM *rd_reads = NULL;
+            static RRDDIM *rd_writes = NULL;
+
+            if (unlikely(!st_io_stats)) {
+                st_io_stats = rrdset_create_localhost(
+                        "netdata"
+                        , "dbengine_io_operations"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData DB engine I/O operations"
+                        , "operations/s"
+                        , "netdata"
+                        , "stats"
+                        , 130507
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_reads = rrddim_add(st_io_stats, "reads", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_writes = rrddim_add(st_io_stats, "writes", NULL, -1, 1, RRD_ALGORITHM_INCREMENTAL);
+            }
+            else
+                rrdset_next(st_io_stats);
+
+            rrddim_set_by_pointer(st_io_stats, rd_reads, (collected_number)stats_array[18]);
+            rrddim_set_by_pointer(st_io_stats, rd_writes, (collected_number)stats_array[16]);
+            rrdset_done(st_io_stats);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_errors = NULL;
+            static RRDDIM *rd_fs_errors = NULL;
+            static RRDDIM *rd_io_errors = NULL;
+            static RRDDIM *pg_cache_over_half_dirty_events = NULL;
+
+            if (unlikely(!st_errors)) {
+                st_errors = rrdset_create_localhost(
+                        "netdata"
+                        , "dbengine_global_errors"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData DB engine errors"
+                        , "errors/s"
+                        , "netdata"
+                        , "stats"
+                        , 130508
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_io_errors = rrddim_add(st_errors, "io_errors", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                rd_fs_errors = rrddim_add(st_errors, "fs_errors", NULL, 1, 1, RRD_ALGORITHM_INCREMENTAL);
+                pg_cache_over_half_dirty_events = rrddim_add(st_errors, "pg_cache_over_half_dirty_events", NULL, 1, 1,
+                                                             RRD_ALGORITHM_INCREMENTAL);
+            }
+            else
+                rrdset_next(st_errors);
+
+            rrddim_set_by_pointer(st_errors, rd_io_errors, (collected_number)stats_array[30]);
+            rrddim_set_by_pointer(st_errors, rd_fs_errors, (collected_number)stats_array[31]);
+            rrddim_set_by_pointer(st_errors, pg_cache_over_half_dirty_events, (collected_number)stats_array[34]);
+            rrdset_done(st_errors);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_fd = NULL;
+            static RRDDIM *rd_fd_current = NULL;
+            static RRDDIM *rd_fd_max = NULL;
+
+            if (unlikely(!st_fd)) {
+                st_fd = rrdset_create_localhost(
+                        "netdata"
+                        , "dbengine_global_file_descriptors"
+                        , NULL
+                        , "dbengine"
+                        , NULL
+                        , "NetData DB engine File Descriptors"
+                        , "descriptors"
+                        , "netdata"
+                        , "stats"
+                        , 130509
+                        , localhost->rrd_update_every
+                        , RRDSET_TYPE_LINE
+                );
+
+                rd_fd_current = rrddim_add(st_fd, "current", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+                rd_fd_max = rrddim_add(st_fd, "max", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(st_fd);
+
+            rrddim_set_by_pointer(st_fd, rd_fd_current, (collected_number)stats_array[32]);
+            /* Careful here, modify this accordingly if the File-Descriptor budget ever changes */
+            rrddim_set_by_pointer(st_fd, rd_fd_max, (collected_number)rlimit_nofile.rlim_cur / 4);
+            rrdset_done(st_fd);
+        }
+
+        // ----------------------------------------------------------------
+
+        {
+            static RRDSET *st_ram_usage = NULL;
+            static RRDDIM *rd_cached = NULL;
+            static RRDDIM *rd_pinned = NULL;
+            static RRDDIM *rd_metadata = NULL;
+
+            collected_number cached_pages, pinned_pages, API_producers, populated_pages, metadata, pages_on_disk,
+            page_cache_descriptors;
+
+            if (unlikely(!st_ram_usage)) {
+                st_ram_usage = rrdset_create_localhost(
+                "netdata"
+                , "dbengine_ram"
+                , NULL
+                , "dbengine"
+                , NULL
+                , "NetData DB engine RAM usage"
+                , "MiB"
+                , "netdata"
+                , "stats"
+                , 130510
+                , localhost->rrd_update_every
+                , RRDSET_TYPE_STACKED
+                );
+
+                rd_cached = rrddim_add(st_ram_usage, "cache", NULL, 1, 256, RRD_ALGORITHM_ABSOLUTE);
+                rd_pinned = rrddim_add(st_ram_usage, "collectors", NULL, 1, 256, RRD_ALGORITHM_ABSOLUTE);
+                rd_metadata = rrddim_add(st_ram_usage, "metadata", NULL, 1, 1048576, RRD_ALGORITHM_ABSOLUTE);
+            }
+            else
+                rrdset_next(st_ram_usage);
+
+            API_producers = (collected_number)stats_array[0];
+            pages_on_disk = (collected_number)stats_array[2];
+            populated_pages = (collected_number)stats_array[3];
+            page_cache_descriptors = (collected_number)stats_array[27];
+
+            if (API_producers * 2 > populated_pages) {
+                pinned_pages = API_producers;
+            } else{
+                pinned_pages = API_producers * 2;
+            }
+            cached_pages = populated_pages - pinned_pages;
+
+            metadata = page_cache_descriptors * sizeof(struct page_cache_descr);
+            metadata += pages_on_disk * sizeof(struct rrdeng_page_descr);
+            /* This is an empirical estimation for Judy array indexing and extent structures */
+            metadata += pages_on_disk * 58;
+
+            rrddim_set_by_pointer(st_ram_usage, rd_cached, cached_pages);
+            rrddim_set_by_pointer(st_ram_usage, rd_pinned, pinned_pages);
+            rrddim_set_by_pointer(st_ram_usage, rd_metadata, metadata);
+            rrdset_done(st_ram_usage);
+        }
+    }
+#endif
+
+}