Adding upstream version 1.44.3.upstream/1.44.3upstream

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

1 files changed, 1420 insertions, 0 deletions

diff --git a/collectors/ebpf.plugin/ebpf_dcstat.c b/collectors/ebpf.plugin/ebpf_dcstat.c
new file mode 100644
index 00000000..4ff6c82a
--- /dev/null
+++ b/collectors/ebpf.plugin/ebpf_dcstat.c
@@ -0,0 +1,1420 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "ebpf.h"
+#include "ebpf_dcstat.h"
+
+static char *dcstat_counter_dimension_name[NETDATA_DCSTAT_IDX_END] = { "ratio", "reference", "slow", "miss" };
+static netdata_syscall_stat_t dcstat_counter_aggregated_data[NETDATA_DCSTAT_IDX_END];
+static netdata_publish_syscall_t dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_END];
+
+netdata_dcstat_pid_t *dcstat_vector = NULL;
+
+static netdata_idx_t dcstat_hash_values[NETDATA_DCSTAT_IDX_END];
+static netdata_idx_t *dcstat_values = NULL;
+
+struct config dcstat_config = { .first_section = NULL,
+    .last_section = NULL,
+    .mutex = NETDATA_MUTEX_INITIALIZER,
+    .index = { .avl_tree = { .root = NULL, .compar = appconfig_section_compare },
+        .rwlock = AVL_LOCK_INITIALIZER } };
+
+ebpf_local_maps_t dcstat_maps[] = {{.name = "dcstat_global", .internal_input = NETDATA_DIRECTORY_CACHE_END,
+                                    .user_input = 0, .type = NETDATA_EBPF_MAP_STATIC,
+                                    .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
+#ifdef LIBBPF_MAJOR_VERSION
+                                    .map_type = BPF_MAP_TYPE_PERCPU_ARRAY
+#endif
+                                   },
+                                   {.name = "dcstat_pid", .internal_input = ND_EBPF_DEFAULT_PID_SIZE,
+                                    .user_input = 0,
+                                    .type = NETDATA_EBPF_MAP_RESIZABLE | NETDATA_EBPF_MAP_PID,
+                                    .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
+#ifdef LIBBPF_MAJOR_VERSION
+                                    .map_type = BPF_MAP_TYPE_PERCPU_HASH
+#endif
+                                   },
+                                   {.name = "dcstat_ctrl", .internal_input = NETDATA_CONTROLLER_END,
+                                    .user_input = 0,
+                                    .type = NETDATA_EBPF_MAP_CONTROLLER,
+                                    .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
+#ifdef LIBBPF_MAJOR_VERSION
+                                    .map_type = BPF_MAP_TYPE_PERCPU_ARRAY
+#endif
+                                   },
+                                   {.name = NULL, .internal_input = 0, .user_input = 0,
+                                    .type = NETDATA_EBPF_MAP_CONTROLLER,
+                                    .map_fd = ND_EBPF_MAP_FD_NOT_INITIALIZED,
+#ifdef LIBBPF_MAJOR_VERSION
+                                    .map_type = BPF_MAP_TYPE_PERCPU_ARRAY
+#endif
+                                    }};
+
+static ebpf_specify_name_t dc_optional_name[] = { {.program_name = "netdata_lookup_fast",
+                                                   .function_to_attach = "lookup_fast",
+                                                   .optional = NULL,
+                                                   .retprobe = CONFIG_BOOLEAN_NO},
+                                                  {.program_name = NULL}};
+
+netdata_ebpf_targets_t dc_targets[] = { {.name = "lookup_fast", .mode = EBPF_LOAD_TRAMPOLINE},
+                                        {.name = "d_lookup", .mode = EBPF_LOAD_TRAMPOLINE},
+                                        {.name = NULL, .mode = EBPF_LOAD_TRAMPOLINE}};
+
+#ifdef NETDATA_DEV_MODE
+int dcstat_disable_priority;
+#endif
+
+#ifdef LIBBPF_MAJOR_VERSION
+/**
+ * Disable probe
+ *
+ * Disable all probes to use exclusively another method.
+ *
+ * @param obj is the main structure for bpf objects
+ */
+static inline void ebpf_dc_disable_probes(struct dc_bpf *obj)
+{
+    bpf_program__set_autoload(obj->progs.netdata_lookup_fast_kprobe, false);
+    bpf_program__set_autoload(obj->progs.netdata_d_lookup_kretprobe, false);
+    bpf_program__set_autoload(obj->progs.netdata_dcstat_release_task_kprobe, false);
+}
+
+/*
+ * Disable trampoline
+ *
+ * Disable all trampoline to use exclusively another method.
+ *
+ * @param obj is the main structure for bpf objects.
+ */
+static inline void ebpf_dc_disable_trampoline(struct dc_bpf *obj)
+{
+    bpf_program__set_autoload(obj->progs.netdata_lookup_fast_fentry, false);
+    bpf_program__set_autoload(obj->progs.netdata_d_lookup_fexit, false);
+    bpf_program__set_autoload(obj->progs.netdata_dcstat_release_task_fentry, false);
+}
+
+/**
+ * Set trampoline target
+ *
+ * Set the targets we will monitor.
+ *
+ * @param obj is the main structure for bpf objects.
+ */
+static void ebpf_dc_set_trampoline_target(struct dc_bpf *obj)
+{
+    bpf_program__set_attach_target(obj->progs.netdata_lookup_fast_fentry, 0,
+                                   dc_targets[NETDATA_DC_TARGET_LOOKUP_FAST].name);
+
+    bpf_program__set_attach_target(obj->progs.netdata_d_lookup_fexit, 0,
+                                   dc_targets[NETDATA_DC_TARGET_D_LOOKUP].name);
+
+    bpf_program__set_attach_target(obj->progs.netdata_dcstat_release_task_fentry, 0,
+                                   EBPF_COMMON_FNCT_CLEAN_UP);
+}
+
+/**
+ * Mount Attach Probe
+ *
+ * Attach probes to target
+ *
+ * @param obj is the main structure for bpf objects.
+ *
+ * @return It returns 0 on success and -1 otherwise.
+ */
+static int ebpf_dc_attach_probes(struct dc_bpf *obj)
+{
+    obj->links.netdata_d_lookup_kretprobe = bpf_program__attach_kprobe(obj->progs.netdata_d_lookup_kretprobe,
+                                                                       true,
+                                                                       dc_targets[NETDATA_DC_TARGET_D_LOOKUP].name);
+    int ret = libbpf_get_error(obj->links.netdata_d_lookup_kretprobe);
+    if (ret)
+        return -1;
+
+    char *lookup_name = (dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional) ?
+        dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional :
+        dc_targets[NETDATA_DC_TARGET_LOOKUP_FAST].name ;
+
+    obj->links.netdata_lookup_fast_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_lookup_fast_kprobe,
+                                                                       false,
+                                                                       lookup_name);
+    ret = libbpf_get_error(obj->links.netdata_lookup_fast_kprobe);
+    if (ret)
+        return -1;
+
+    obj->links.netdata_dcstat_release_task_kprobe = bpf_program__attach_kprobe(obj->progs.netdata_dcstat_release_task_kprobe,
+                                                                       false,
+                                                                       EBPF_COMMON_FNCT_CLEAN_UP);
+    ret = libbpf_get_error(obj->links.netdata_dcstat_release_task_kprobe);
+    if (ret)
+        return -1;
+
+    return 0;
+}
+
+/**
+ * Adjust Map Size
+ *
+ * Resize maps according input from users.
+ *
+ * @param obj is the main structure for bpf objects.
+ * @param em  structure with configuration
+ */
+static void ebpf_dc_adjust_map(struct dc_bpf *obj, ebpf_module_t *em)
+{
+    ebpf_update_map_size(obj->maps.dcstat_pid, &dcstat_maps[NETDATA_DCSTAT_PID_STATS],
+                         em, bpf_map__name(obj->maps.dcstat_pid));
+
+    ebpf_update_map_type(obj->maps.dcstat_global, &dcstat_maps[NETDATA_DCSTAT_GLOBAL_STATS]);
+    ebpf_update_map_type(obj->maps.dcstat_pid, &dcstat_maps[NETDATA_DCSTAT_PID_STATS]);
+    ebpf_update_map_type(obj->maps.dcstat_ctrl, &dcstat_maps[NETDATA_DCSTAT_CTRL]);
+}
+
+/**
+ * Set hash tables
+ *
+ * Set the values for maps according the value given by kernel.
+ *
+ * @param obj is the main structure for bpf objects.
+ */
+static void ebpf_dc_set_hash_tables(struct dc_bpf *obj)
+{
+    dcstat_maps[NETDATA_DCSTAT_GLOBAL_STATS].map_fd = bpf_map__fd(obj->maps.dcstat_global);
+    dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd = bpf_map__fd(obj->maps.dcstat_pid);
+    dcstat_maps[NETDATA_DCSTAT_CTRL].map_fd = bpf_map__fd(obj->maps.dcstat_ctrl);
+}
+
+/**
+ * Update Load
+ *
+ * For directory cache, some distributions change the function name, and we do not have condition to use
+ * TRAMPOLINE like other functions.
+ *
+ * @param em  structure with configuration
+ *
+ * @return When then symbols were not modified, it returns TRAMPOLINE, else it returns RETPROBE.
+ */
+netdata_ebpf_program_loaded_t ebpf_dc_update_load(ebpf_module_t *em)
+{
+    if (!strcmp(dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].optional,
+                dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].function_to_attach))
+        return EBPF_LOAD_TRAMPOLINE;
+
+    if (em->targets[NETDATA_DC_TARGET_LOOKUP_FAST].mode != EBPF_LOAD_RETPROBE)
+        netdata_log_info("When your kernel was compiled the symbol %s was modified, instead to use `trampoline`, the plugin will use `probes`.",
+             dc_optional_name[NETDATA_DC_TARGET_LOOKUP_FAST].function_to_attach);
+
+    return EBPF_LOAD_RETPROBE;
+}
+
+/**
+ *  Disable Release Task
+ *
+ *  Disable release task when apps is not enabled.
+ *
+ *  @param obj is the main structure for bpf objects.
+ */
+static void ebpf_dc_disable_release_task(struct dc_bpf *obj)
+{
+    bpf_program__set_autoload(obj->progs.netdata_dcstat_release_task_kprobe, false);
+    bpf_program__set_autoload(obj->progs.netdata_dcstat_release_task_fentry, false);
+}
+
+/**
+ * Load and attach
+ *
+ * Load and attach the eBPF code in kernel.
+ *
+ * @param obj is the main structure for bpf objects.
+ * @param em  structure with configuration
+ *
+ * @return it returns 0 on success and -1 otherwise
+ */
+static inline int ebpf_dc_load_and_attach(struct dc_bpf *obj, ebpf_module_t *em)
+{
+    netdata_ebpf_program_loaded_t test =  ebpf_dc_update_load(em);
+    if (test == EBPF_LOAD_TRAMPOLINE) {
+        ebpf_dc_disable_probes(obj);
+
+        ebpf_dc_set_trampoline_target(obj);
+    } else {
+        ebpf_dc_disable_trampoline(obj);
+    }
+
+    ebpf_dc_adjust_map(obj, em);
+
+    if (!em->apps_charts && !em->cgroup_charts)
+        ebpf_dc_disable_release_task(obj);
+
+    int ret = dc_bpf__load(obj);
+    if (ret) {
+        return ret;
+    }
+
+    ret = (test == EBPF_LOAD_TRAMPOLINE) ? dc_bpf__attach(obj) : ebpf_dc_attach_probes(obj);
+    if (!ret) {
+        ebpf_dc_set_hash_tables(obj);
+
+        ebpf_update_controller(dcstat_maps[NETDATA_DCSTAT_CTRL].map_fd, em);
+    }
+
+    return ret;
+}
+#endif
+
+/*****************************************************************
+ *
+ *  COMMON FUNCTIONS
+ *
+ *****************************************************************/
+
+/**
+ * Update publish
+ *
+ * Update publish values before to write dimension.
+ *
+ * @param out           structure that will receive data.
+ * @param cache_access  number of access to directory cache.
+ * @param not_found     number of files not found on the file system
+ */
+void dcstat_update_publish(netdata_publish_dcstat_t *out, uint64_t cache_access, uint64_t not_found)
+{
+    NETDATA_DOUBLE successful_access = (NETDATA_DOUBLE) (((long long)cache_access) - ((long long)not_found));
+    NETDATA_DOUBLE ratio = (cache_access) ? successful_access/(NETDATA_DOUBLE)cache_access : 0;
+
+    out->ratio = (long long )(ratio*100);
+}
+
+/*****************************************************************
+ *
+ *  FUNCTIONS TO CLOSE THE THREAD
+ *
+ *****************************************************************/
+
+static void ebpf_obsolete_specific_dc_charts(char *type, int update_every);
+
+/**
+ * Obsolete services
+ *
+ * Obsolete all service charts created
+ *
+ * @param em a pointer to `struct ebpf_module`
+ */
+static void ebpf_obsolete_dc_services(ebpf_module_t *em)
+{
+    ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
+                              NETDATA_DC_HIT_CHART,
+                              "",
+                              "Percentage of files inside directory cache",
+                              EBPF_COMMON_DIMENSION_PERCENTAGE,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NETDATA_SYSTEMD_DC_HIT_RATIO_CONTEXT,
+                              21200,
+                              em->update_every);
+
+    ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
+                              NETDATA_DC_REFERENCE_CHART,
+                              "",
+                              "Count file access",
+                              EBPF_COMMON_DIMENSION_FILES,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NETDATA_SYSTEMD_DC_REFERENCE_CONTEXT,
+                              21201,
+                              em->update_every);
+
+    ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
+                              NETDATA_DC_REQUEST_NOT_CACHE_CHART,
+                              "",
+                              "Files not present inside directory cache",
+                              EBPF_COMMON_DIMENSION_FILES,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NETDATA_SYSTEMD_DC_NOT_CACHE_CONTEXT,
+                              21202,
+                              em->update_every);
+
+    ebpf_write_chart_obsolete(NETDATA_SERVICE_FAMILY,
+                              NETDATA_DC_REQUEST_NOT_FOUND_CHART,
+                              "",
+                              "Files not found",
+                              EBPF_COMMON_DIMENSION_FILES,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NETDATA_SYSTEMD_DC_NOT_FOUND_CONTEXT,
+                              21202,
+                              em->update_every);
+}
+
+/**
+ * Obsolete cgroup chart
+ *
+ * Send obsolete for all charts created before to close.
+ *
+ * @param em a pointer to `struct ebpf_module`
+ */
+static inline void ebpf_obsolete_dc_cgroup_charts(ebpf_module_t *em) {
+    pthread_mutex_lock(&mutex_cgroup_shm);
+
+    ebpf_obsolete_dc_services(em);
+
+    ebpf_cgroup_target_t *ect;
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (ect->systemd)
+            continue;
+
+        ebpf_obsolete_specific_dc_charts(ect->name, em->update_every);
+    }
+    pthread_mutex_unlock(&mutex_cgroup_shm);
+}
+
+/**
+ * Obsolette apps charts
+ *
+ * Obsolete apps charts.
+ *
+ * @param em a pointer to the structure with the default values.
+ */
+void ebpf_obsolete_dc_apps_charts(struct ebpf_module *em)
+{
+    struct ebpf_target *w;
+    int update_every = em->update_every;
+    for (w = apps_groups_root_target; w; w = w->next) {
+        if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_DCSTAT_IDX))))
+            continue;
+
+        ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
+                                  w->clean_name,
+                                  "_ebpf_dc_hit",
+                                  "Percentage of files inside directory cache.",
+                                  EBPF_COMMON_DIMENSION_PERCENTAGE,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_LINE,
+                                  "app.ebpf_dc_hit",
+                                  20265,
+                                  update_every);
+
+        ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
+                                  w->clean_name,
+                                  "_ebpf_dc_reference",
+                                  "Count file access.",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_STACKED,
+                                  "app.ebpf_dc_reference",
+                                  20266,
+                                  update_every);
+
+        ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
+                                  w->clean_name,
+                                  "_ebpf_not_cache",
+                                  "Files not present inside directory cache.",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_STACKED,
+                                  "app.ebpf_dc_not_cache",
+                                  20267,
+                                  update_every);
+
+        ebpf_write_chart_obsolete(NETDATA_APP_FAMILY,
+                                  w->clean_name,
+                                  "_ebpf_not_found",
+                                  "Files not found.",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_STACKED,
+                                  "app.ebpf_dc_not_found",
+                                  20268,
+                                  update_every);
+
+        w->charts_created &= ~(1<<EBPF_MODULE_DCSTAT_IDX);
+    }
+}
+
+/**
+ * Obsolete global
+ *
+ * Obsolete global charts created by thread.
+ *
+ * @param em a pointer to `struct ebpf_module`
+ */
+static void ebpf_obsolete_dc_global(ebpf_module_t *em)
+{
+    ebpf_write_chart_obsolete(NETDATA_FILESYSTEM_FAMILY,
+                              NETDATA_DC_HIT_CHART,
+                              "",
+                              "Percentage of files inside directory cache",
+                              EBPF_COMMON_DIMENSION_PERCENTAGE,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NULL,
+                              21200,
+                              em->update_every);
+
+    ebpf_write_chart_obsolete(NETDATA_FILESYSTEM_FAMILY,
+                              NETDATA_DC_REFERENCE_CHART,
+                              "",
+                              "Variables used to calculate hit ratio.",
+                              EBPF_COMMON_DIMENSION_FILES,
+                              NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE,
+                              NULL,
+                              21201,
+                              em->update_every);
+}
+
+/**
+ * DCstat exit
+ *
+ * Cancel child and exit.
+ *
+ * @param ptr thread data.
+ */
+static void ebpf_dcstat_exit(void *ptr)
+{
+    ebpf_module_t *em = (ebpf_module_t *)ptr;
+
+    if (em->enabled == NETDATA_THREAD_EBPF_FUNCTION_RUNNING) {
+        pthread_mutex_lock(&lock);
+        if (em->cgroup_charts) {
+            ebpf_obsolete_dc_cgroup_charts(em);
+            fflush(stdout);
+        }
+
+        if (em->apps_charts & NETDATA_EBPF_APPS_FLAG_CHART_CREATED) {
+            ebpf_obsolete_dc_apps_charts(em);
+        }
+
+        ebpf_obsolete_dc_global(em);
+
+#ifdef NETDATA_DEV_MODE
+        if (ebpf_aral_dcstat_pid)
+            ebpf_statistic_obsolete_aral_chart(em, dcstat_disable_priority);
+#endif
+
+        fflush(stdout);
+        pthread_mutex_unlock(&lock);
+    }
+
+    ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_REMOVE);
+
+#ifdef LIBBPF_MAJOR_VERSION
+    if (dc_bpf_obj) {
+        dc_bpf__destroy(dc_bpf_obj);
+        dc_bpf_obj = NULL;
+    }
+#endif
+
+    if (em->objects){
+        ebpf_unload_legacy_code(em->objects, em->probe_links);
+        em->objects = NULL;
+        em->probe_links = NULL;
+    }
+
+    pthread_mutex_lock(&ebpf_exit_cleanup);
+    em->enabled = NETDATA_THREAD_EBPF_STOPPED;
+    ebpf_update_stats(&plugin_statistics, em);
+    pthread_mutex_unlock(&ebpf_exit_cleanup);
+}
+
+/*****************************************************************
+ *
+ *  APPS
+ *
+ *****************************************************************/
+
+/**
+ * Create apps charts
+ *
+ * Call ebpf_create_chart to create the charts on apps submenu.
+ *
+ * @param em a pointer to the structure with the default values.
+ */
+void ebpf_dcstat_create_apps_charts(struct ebpf_module *em, void *ptr)
+{
+    struct ebpf_target *root = ptr;
+    struct ebpf_target *w;
+    int update_every = em->update_every;
+    for (w = root; w; w = w->next) {
+        if (unlikely(!w->exposed))
+            continue;
+
+        ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
+                             w->clean_name,
+                             "_ebpf_dc_hit",
+                             "Percentage of files inside directory cache.",
+                             EBPF_COMMON_DIMENSION_PERCENTAGE,
+                             NETDATA_DIRECTORY_CACHE_SUBMENU,
+                             NETDATA_EBPF_CHART_TYPE_LINE,
+                             "app.ebpf_dc_hit",
+                             20265,
+                             update_every,
+                             NETDATA_EBPF_MODULE_NAME_DCSTAT);
+        ebpf_create_chart_labels("app_group", w->name, 1);
+        ebpf_commit_label();
+        fprintf(stdout, "DIMENSION ratio '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
+
+        ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
+                             w->clean_name,
+                             "_ebpf_dc_reference",
+                             "Count file access.",
+                             EBPF_COMMON_DIMENSION_FILES,
+                             NETDATA_DIRECTORY_CACHE_SUBMENU,
+                             NETDATA_EBPF_CHART_TYPE_STACKED,
+                             "app.ebpf_dc_reference",
+                             20266,
+                             update_every,
+                             NETDATA_EBPF_MODULE_NAME_DCSTAT);
+        ebpf_create_chart_labels("app_group", w->name, 1);
+        ebpf_commit_label();
+        fprintf(stdout, "DIMENSION files '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
+
+        ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
+                             w->clean_name,
+                             "_ebpf_not_cache",
+                             "Files not present inside directory cache.",
+                             EBPF_COMMON_DIMENSION_FILES,
+                             NETDATA_DIRECTORY_CACHE_SUBMENU,
+                             NETDATA_EBPF_CHART_TYPE_STACKED,
+                             "app.ebpf_dc_not_cache",
+                             20267,
+                             update_every,
+                             NETDATA_EBPF_MODULE_NAME_DCSTAT);
+        ebpf_create_chart_labels("app_group", w->name, 1);
+        ebpf_commit_label();
+        fprintf(stdout, "DIMENSION files '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
+
+        ebpf_write_chart_cmd(NETDATA_APP_FAMILY,
+                             w->clean_name,
+                             "_ebpf_not_found",
+                             "Files not found.",
+                             EBPF_COMMON_DIMENSION_FILES,
+                             NETDATA_DIRECTORY_CACHE_SUBMENU,
+                             NETDATA_EBPF_CHART_TYPE_STACKED,
+                             "app.ebpf_dc_not_found",
+                             20268,
+                             update_every,
+                             NETDATA_EBPF_MODULE_NAME_DCSTAT);
+        ebpf_create_chart_labels("app_group", w->name, 1);
+        ebpf_commit_label();
+        fprintf(stdout, "DIMENSION files '' %s 1 1\n", ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX]);
+
+        w->charts_created |= 1<<EBPF_MODULE_DCSTAT_IDX;
+    }
+
+    em->apps_charts |= NETDATA_EBPF_APPS_FLAG_CHART_CREATED;
+}
+
+/*****************************************************************
+ *
+ *  MAIN LOOP
+ *
+ *****************************************************************/
+
+/**
+ * Apps Accumulator
+ *
+ * Sum all values read from kernel and store in the first address.
+ *
+ * @param out the vector with read values.
+ * @param maps_per_core do I need to read all cores?
+ */
+static void dcstat_apps_accumulator(netdata_dcstat_pid_t *out, int maps_per_core)
+{
+    int i, end = (maps_per_core) ? ebpf_nprocs : 1;
+    netdata_dcstat_pid_t *total = &out[0];
+    for (i = 1; i < end; i++) {
+        netdata_dcstat_pid_t *w = &out[i];
+        total->cache_access += w->cache_access;
+        total->file_system += w->file_system;
+        total->not_found += w->not_found;
+    }
+}
+
+/**
+ * Save PID values
+ *
+ * Save the current values inside the structure
+ *
+ * @param out     vector used to plot charts
+ * @param publish vector with values read from hash tables.
+ */
+static inline void dcstat_save_pid_values(netdata_publish_dcstat_t *out, netdata_dcstat_pid_t *publish)
+{
+    memcpy(&out->curr, &publish[0], sizeof(netdata_dcstat_pid_t));
+}
+
+/**
+ * Fill PID
+ *
+ * Fill PID structures
+ *
+ * @param current_pid pid that we are collecting data
+ * @param out         values read from hash tables;
+ */
+static void dcstat_fill_pid(uint32_t current_pid, netdata_dcstat_pid_t *publish)
+{
+    netdata_publish_dcstat_t *curr = dcstat_pid[current_pid];
+    if (!curr) {
+        curr = ebpf_publish_dcstat_get();
+        dcstat_pid[current_pid] = curr;
+    }
+
+    dcstat_save_pid_values(curr, publish);
+}
+
+/**
+ * Read Directory Cache APPS table
+ *
+ * Read the apps table and store data inside the structure.
+ *
+ * @param maps_per_core do I need to read all cores?
+ */
+static void read_dc_apps_table(int maps_per_core)
+{
+    netdata_dcstat_pid_t *cv = dcstat_vector;
+    uint32_t key;
+    struct ebpf_pid_stat *pids = ebpf_root_of_pids;
+    int fd = dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd;
+    size_t length = sizeof(netdata_dcstat_pid_t);
+    if (maps_per_core)
+        length *= ebpf_nprocs;
+
+    while (pids) {
+        key = pids->pid;
+
+        if (bpf_map_lookup_elem(fd, &key, cv)) {
+            pids = pids->next;
+            continue;
+        }
+
+        dcstat_apps_accumulator(cv, maps_per_core);
+
+        dcstat_fill_pid(key, cv);
+
+        // We are cleaning to avoid passing data read from one process to other.
+        memset(cv, 0, length);
+
+        pids = pids->next;
+    }
+}
+
+/**
+ * Update cgroup
+ *
+ * Update cgroup data based in collected PID.
+ *
+ * @param maps_per_core do I need to read all cores?
+ */
+static void ebpf_update_dc_cgroup(int maps_per_core)
+{
+    netdata_dcstat_pid_t *cv = dcstat_vector;
+    int fd = dcstat_maps[NETDATA_DCSTAT_PID_STATS].map_fd;
+    size_t length = sizeof(netdata_dcstat_pid_t)*ebpf_nprocs;
+
+    ebpf_cgroup_target_t *ect;
+    pthread_mutex_lock(&mutex_cgroup_shm);
+    for (ect = ebpf_cgroup_pids; ect; ect = ect->next) {
+        struct pid_on_target2 *pids;
+        for (pids = ect->pids; pids; pids = pids->next) {
+            int pid = pids->pid;
+            netdata_dcstat_pid_t *out = &pids->dc;
+            if (likely(dcstat_pid) && dcstat_pid[pid]) {
+                netdata_publish_dcstat_t *in = dcstat_pid[pid];
+
+                memcpy(out, &in->curr, sizeof(netdata_dcstat_pid_t));
+            } else {
+                memset(cv, 0, length);
+                if (bpf_map_lookup_elem(fd, &pid, cv)) {
+                    continue;
+                }
+
+                dcstat_apps_accumulator(cv, maps_per_core);
+
+                memcpy(out, cv, sizeof(netdata_dcstat_pid_t));
+            }
+        }
+    }
+    pthread_mutex_unlock(&mutex_cgroup_shm);
+}
+
+/**
+ * Read global table
+ *
+ * Read the table with number of calls for all functions
+ *
+ * @param stats         vector used to read data from control table.
+ * @param maps_per_core do I need to read all cores?
+ */
+static void ebpf_dc_read_global_tables(netdata_idx_t *stats, int maps_per_core)
+{
+    ebpf_read_global_table_stats(dcstat_hash_values,
+                                 dcstat_values,
+                                 dcstat_maps[NETDATA_DCSTAT_GLOBAL_STATS].map_fd,
+                                 maps_per_core,
+                                 NETDATA_KEY_DC_REFERENCE,
+                                 NETDATA_DIRECTORY_CACHE_END);
+
+    ebpf_read_global_table_stats(stats,
+                                 dcstat_values,
+                                 dcstat_maps[NETDATA_DCSTAT_CTRL].map_fd,
+                                 maps_per_core,
+                                 NETDATA_CONTROLLER_PID_TABLE_ADD,
+                                 NETDATA_CONTROLLER_END);
+}
+
+/**
+ * Cachestat sum PIDs
+ *
+ * Sum values for all PIDs associated to a group
+ *
+ * @param publish  output structure.
+ * @param root     structure with listed IPs
+ */
+void ebpf_dcstat_sum_pids(netdata_publish_dcstat_t *publish, struct ebpf_pid_on_target *root)
+{
+    memset(&publish->curr, 0, sizeof(netdata_dcstat_pid_t));
+    netdata_dcstat_pid_t *dst = &publish->curr;
+    while (root) {
+        int32_t pid = root->pid;
+        netdata_publish_dcstat_t *w = dcstat_pid[pid];
+        if (w) {
+            netdata_dcstat_pid_t *src = &w->curr;
+            dst->cache_access += src->cache_access;
+            dst->file_system += src->file_system;
+            dst->not_found += src->not_found;
+        }
+
+        root = root->next;
+    }
+}
+
+/**
+ * Send data to Netdata calling auxiliary functions.
+ *
+ * @param root the target list.
+*/
+void ebpf_dcache_send_apps_data(struct ebpf_target *root)
+{
+    struct ebpf_target *w;
+    collected_number value;
+
+    for (w = root; w; w = w->next) {
+        if (unlikely(!(w->charts_created & (1<<EBPF_MODULE_DCSTAT_IDX))))
+            continue;
+
+        ebpf_dcstat_sum_pids(&w->dcstat, w->root_pid);
+
+        uint64_t cache = w->dcstat.curr.cache_access;
+        uint64_t not_found = w->dcstat.curr.not_found;
+
+        dcstat_update_publish(&w->dcstat, cache, not_found);
+
+        value = (collected_number) w->dcstat.ratio;
+        ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_dc_hit");
+        write_chart_dimension("ratio", value);
+        ebpf_write_end_chart();
+
+        if (w->dcstat.curr.cache_access < w->dcstat.prev.cache_access) {
+            w->dcstat.prev.cache_access = 0;
+        }
+        w->dcstat.cache_access = (long long)w->dcstat.curr.cache_access - (long long)w->dcstat.prev.cache_access;
+
+        ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_dc_reference");
+        value = (collected_number) w->dcstat.cache_access;
+        write_chart_dimension("files", value);
+        ebpf_write_end_chart();
+        w->dcstat.prev.cache_access = w->dcstat.curr.cache_access;
+
+        if (w->dcstat.curr.file_system < w->dcstat.prev.file_system) {
+            w->dcstat.prev.file_system = 0;
+        }
+        value = (collected_number) (!w->dcstat.cache_access) ? 0 :
+                (long long )w->dcstat.curr.file_system - (long long)w->dcstat.prev.file_system;
+        ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_not_cache");
+        write_chart_dimension("files", value);
+        ebpf_write_end_chart();
+        w->dcstat.prev.file_system = w->dcstat.curr.file_system;
+
+        if (w->dcstat.curr.not_found < w->dcstat.prev.not_found) {
+            w->dcstat.prev.not_found = 0;
+        }
+        value = (collected_number) (!w->dcstat.cache_access) ? 0 :
+                (long long)w->dcstat.curr.not_found - (long long)w->dcstat.prev.not_found;
+        ebpf_write_begin_chart(NETDATA_APP_FAMILY, w->clean_name, "_ebpf_not_found");
+        write_chart_dimension("files", value);
+        ebpf_write_end_chart();
+        w->dcstat.prev.not_found = w->dcstat.curr.not_found;
+    }
+}
+
+/**
+ * Send global
+ *
+ * Send global charts to Netdata
+ */
+static void dcstat_send_global(netdata_publish_dcstat_t *publish)
+{
+    dcstat_update_publish(publish, dcstat_hash_values[NETDATA_KEY_DC_REFERENCE],
+                          dcstat_hash_values[NETDATA_KEY_DC_MISS]);
+
+    netdata_publish_syscall_t *ptr = dcstat_counter_publish_aggregated;
+    netdata_idx_t value = dcstat_hash_values[NETDATA_KEY_DC_REFERENCE];
+    if (value != ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall) {
+        ptr[NETDATA_DCSTAT_IDX_REFERENCE].ncall = value - ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall;
+        ptr[NETDATA_DCSTAT_IDX_REFERENCE].pcall = value;
+
+        value = dcstat_hash_values[NETDATA_KEY_DC_SLOW];
+        ptr[NETDATA_DCSTAT_IDX_SLOW].ncall =  value - ptr[NETDATA_DCSTAT_IDX_SLOW].pcall;
+        ptr[NETDATA_DCSTAT_IDX_SLOW].pcall = value;
+
+        value = dcstat_hash_values[NETDATA_KEY_DC_MISS];
+        ptr[NETDATA_DCSTAT_IDX_MISS].ncall = value - ptr[NETDATA_DCSTAT_IDX_MISS].pcall;
+        ptr[NETDATA_DCSTAT_IDX_MISS].pcall = value;
+    } else {
+        ptr[NETDATA_DCSTAT_IDX_REFERENCE].ncall = 0;
+        ptr[NETDATA_DCSTAT_IDX_SLOW].ncall = 0;
+        ptr[NETDATA_DCSTAT_IDX_MISS].ncall = 0;
+    }
+
+    ebpf_one_dimension_write_charts(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_HIT_CHART,
+                                    ptr[NETDATA_DCSTAT_IDX_RATIO].dimension, publish->ratio);
+
+    write_count_chart(
+        NETDATA_DC_REFERENCE_CHART, NETDATA_FILESYSTEM_FAMILY,
+                      &dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 3);
+}
+
+/**
+ * Create specific directory cache charts
+ *
+ * Create charts for cgroup/application.
+ *
+ * @param type the chart type.
+ * @param update_every value to overwrite the update frequency set by the server.
+ */
+static void ebpf_create_specific_dc_charts(char *type, int update_every)
+{
+    ebpf_create_chart(type, NETDATA_DC_HIT_CHART, "Percentage of files inside directory cache",
+                      EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NETDATA_CGROUP_DC_HIT_RATIO_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
+                      NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5700,
+                      ebpf_create_global_dimension,
+                      dcstat_counter_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+
+    ebpf_create_chart(type, NETDATA_DC_REFERENCE_CHART, "Count file access",
+                      EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NETDATA_CGROUP_DC_REFERENCE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
+                      NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5701,
+                      ebpf_create_global_dimension,
+                      &dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 1,
+                      update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+
+    ebpf_create_chart(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART,
+                      "Files not present inside directory cache",
+                      EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NETDATA_CGROUP_DC_NOT_CACHE_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
+                      NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5702,
+                      ebpf_create_global_dimension,
+                      &dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_SLOW], 1,
+                      update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+
+    ebpf_create_chart(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART,
+                      "Files not found",
+                      EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NETDATA_CGROUP_DC_NOT_FOUND_CONTEXT, NETDATA_EBPF_CHART_TYPE_LINE,
+                      NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5703,
+                      ebpf_create_global_dimension,
+                      &dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_MISS], 1,
+                      update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+}
+
+/**
+ * Obsolete specific directory cache charts
+ *
+ * Obsolete charts for cgroup/application.
+ *
+ * @param type the chart type.
+ * @param update_every value to overwrite the update frequency set by the server.
+ */
+static void ebpf_obsolete_specific_dc_charts(char *type, int update_every)
+{
+    ebpf_write_chart_obsolete(type, NETDATA_DC_HIT_CHART,
+                              "",
+                              "Percentage of files inside directory cache",
+                              EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_HIT_RATIO_CONTEXT,
+                              NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5700, update_every);
+
+    ebpf_write_chart_obsolete(type, NETDATA_DC_REFERENCE_CHART,
+                              "",
+                              "Count file access",
+                              EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_REFERENCE_CONTEXT,
+                              NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5701, update_every);
+
+    ebpf_write_chart_obsolete(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART,
+                              "",
+                              "Files not present inside directory cache",
+                              EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_NOT_CACHE_CONTEXT,
+                              NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5702, update_every);
+
+    ebpf_write_chart_obsolete(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART,
+                              "",
+                              "Files not found",
+                              EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                              NETDATA_EBPF_CHART_TYPE_LINE, NETDATA_CGROUP_DC_NOT_FOUND_CONTEXT,
+                              NETDATA_CHART_PRIO_CGROUPS_CONTAINERS + 5703, update_every);
+}
+
+/**
+ * Cachestat sum PIDs
+ *
+ * Sum values for all PIDs associated to a group
+ *
+ * @param publish  output structure.
+ * @param root     structure with listed IPs
+ */
+void ebpf_dc_sum_cgroup_pids(netdata_publish_dcstat_t *publish, struct pid_on_target2 *root)
+{
+    memset(&publish->curr, 0, sizeof(netdata_dcstat_pid_t));
+    netdata_dcstat_pid_t *dst = &publish->curr;
+    while (root) {
+        netdata_dcstat_pid_t *src = &root->dc;
+
+        dst->cache_access += src->cache_access;
+        dst->file_system += src->file_system;
+        dst->not_found += src->not_found;
+
+        root = root->next;
+    }
+}
+
+/**
+ * Calc chart values
+ *
+ * Do necessary math to plot charts.
+ */
+void ebpf_dc_calc_chart_values()
+{
+    ebpf_cgroup_target_t *ect;
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        ebpf_dc_sum_cgroup_pids(&ect->publish_dc, ect->pids);
+        uint64_t cache = ect->publish_dc.curr.cache_access;
+        uint64_t not_found = ect->publish_dc.curr.not_found;
+
+        dcstat_update_publish(&ect->publish_dc, cache, not_found);
+
+        ect->publish_dc.cache_access = (long long)ect->publish_dc.curr.cache_access -
+            (long long)ect->publish_dc.prev.cache_access;
+        ect->publish_dc.prev.cache_access = ect->publish_dc.curr.cache_access;
+
+        if (ect->publish_dc.curr.not_found < ect->publish_dc.prev.not_found) {
+            ect->publish_dc.prev.not_found = 0;
+        }
+    }
+}
+
+/**
+ *  Create Systemd directory cache Charts
+ *
+ *  Create charts when systemd is enabled
+ *
+ *  @param update_every value to overwrite the update frequency set by the server.
+ **/
+static void ebpf_create_systemd_dc_charts(int update_every)
+{
+    ebpf_create_charts_on_systemd(NETDATA_DC_HIT_CHART,
+                                  "Percentage of files inside directory cache",
+                                  EBPF_COMMON_DIMENSION_PERCENTAGE,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_LINE,
+                                  21200,
+                                  ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
+                                  NETDATA_SYSTEMD_DC_HIT_RATIO_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
+                                  update_every);
+
+    ebpf_create_charts_on_systemd(NETDATA_DC_REFERENCE_CHART,
+                                  "Count file access",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_LINE,
+                                  21201,
+                                  ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
+                                  NETDATA_SYSTEMD_DC_REFERENCE_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
+                                  update_every);
+
+    ebpf_create_charts_on_systemd(NETDATA_DC_REQUEST_NOT_CACHE_CHART,
+                                  "Files not present inside directory cache",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_LINE,
+                                  21202,
+                                  ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
+                                  NETDATA_SYSTEMD_DC_NOT_CACHE_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
+                                  update_every);
+
+    ebpf_create_charts_on_systemd(NETDATA_DC_REQUEST_NOT_FOUND_CHART,
+                                  "Files not found",
+                                  EBPF_COMMON_DIMENSION_FILES,
+                                  NETDATA_DIRECTORY_CACHE_SUBMENU,
+                                  NETDATA_EBPF_CHART_TYPE_LINE,
+                                  21202,
+                                  ebpf_algorithms[NETDATA_EBPF_ABSOLUTE_IDX],
+                                  NETDATA_SYSTEMD_DC_NOT_FOUND_CONTEXT, NETDATA_EBPF_MODULE_NAME_DCSTAT,
+                                  update_every);
+}
+
+/**
+ * Send Directory Cache charts
+ *
+ * Send collected data to Netdata.
+ */
+static void ebpf_send_systemd_dc_charts()
+{
+    collected_number value;
+    ebpf_cgroup_target_t *ect;
+    ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_HIT_CHART, "");
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (unlikely(ect->systemd) && unlikely(ect->updated)) {
+            write_chart_dimension(ect->name, (long long) ect->publish_dc.ratio);
+        }
+    }
+    ebpf_write_end_chart();
+
+    ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REFERENCE_CHART, "");
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (unlikely(ect->systemd) && unlikely(ect->updated)) {
+            write_chart_dimension(ect->name, (long long) ect->publish_dc.cache_access);
+        }
+    }
+    ebpf_write_end_chart();
+
+    ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REQUEST_NOT_CACHE_CHART, "");
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (unlikely(ect->systemd) && unlikely(ect->updated)) {
+            value = (collected_number) (!ect->publish_dc.cache_access) ? 0 :
+                (long long )ect->publish_dc.curr.file_system - (long long)ect->publish_dc.prev.file_system;
+            ect->publish_dc.prev.file_system = ect->publish_dc.curr.file_system;
+
+            write_chart_dimension(ect->name, (long long) value);
+        }
+    }
+    ebpf_write_end_chart();
+
+    ebpf_write_begin_chart(NETDATA_SERVICE_FAMILY, NETDATA_DC_REQUEST_NOT_FOUND_CHART, "");
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (unlikely(ect->systemd) && unlikely(ect->updated)) {
+            value = (collected_number) (!ect->publish_dc.cache_access) ? 0 :
+                (long long)ect->publish_dc.curr.not_found - (long long)ect->publish_dc.prev.not_found;
+
+            ect->publish_dc.prev.not_found = ect->publish_dc.curr.not_found;
+
+            write_chart_dimension(ect->name, (long long) value);
+        }
+    }
+    ebpf_write_end_chart();
+}
+
+/**
+ * Send Directory Cache charts
+ *
+ * Send collected data to Netdata.
+ *
+ */
+static void ebpf_send_specific_dc_data(char *type, netdata_publish_dcstat_t *pdc)
+{
+    collected_number value;
+    ebpf_write_begin_chart(type, NETDATA_DC_HIT_CHART, "");
+    write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_RATIO].name,
+                          (long long) pdc->ratio);
+    ebpf_write_end_chart();
+
+    ebpf_write_begin_chart(type, NETDATA_DC_REFERENCE_CHART, "");
+    write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE].name,
+                          (long long) pdc->cache_access);
+    ebpf_write_end_chart();
+
+    value = (collected_number) (!pdc->cache_access) ? 0 :
+        (long long )pdc->curr.file_system - (long long)pdc->prev.file_system;
+    pdc->prev.file_system = pdc->curr.file_system;
+
+    ebpf_write_begin_chart(type, NETDATA_DC_REQUEST_NOT_CACHE_CHART, "");
+    write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_SLOW].name, (long long) value);
+    ebpf_write_end_chart();
+
+    value = (collected_number) (!pdc->cache_access) ? 0 :
+        (long long)pdc->curr.not_found - (long long)pdc->prev.not_found;
+    pdc->prev.not_found = pdc->curr.not_found;
+
+    ebpf_write_begin_chart(type, NETDATA_DC_REQUEST_NOT_FOUND_CHART, "");
+    write_chart_dimension(dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_MISS].name, (long long) value);
+    ebpf_write_end_chart();
+}
+
+/**
+ * Send data to Netdata calling auxiliary functions.
+ *
+ * @param update_every value to overwrite the update frequency set by the server.
+*/
+void ebpf_dc_send_cgroup_data(int update_every)
+{
+    if (!ebpf_cgroup_pids)
+        return;
+
+    pthread_mutex_lock(&mutex_cgroup_shm);
+    ebpf_cgroup_target_t *ect;
+    ebpf_dc_calc_chart_values();
+
+    int has_systemd = shm_ebpf_cgroup.header->systemd_enabled;
+    if (has_systemd) {
+        if (send_cgroup_chart) {
+            ebpf_create_systemd_dc_charts(update_every);
+        }
+
+        ebpf_send_systemd_dc_charts();
+    }
+
+    for (ect = ebpf_cgroup_pids; ect ; ect = ect->next) {
+        if (ect->systemd)
+            continue;
+
+        if (!(ect->flags & NETDATA_EBPF_CGROUP_HAS_DC_CHART) && ect->updated) {
+            ebpf_create_specific_dc_charts(ect->name, update_every);
+            ect->flags |= NETDATA_EBPF_CGROUP_HAS_DC_CHART;
+        }
+
+        if (ect->flags & NETDATA_EBPF_CGROUP_HAS_DC_CHART) {
+            if (ect->updated) {
+                ebpf_send_specific_dc_data(ect->name, &ect->publish_dc);
+            } else {
+                ebpf_obsolete_specific_dc_charts(ect->name, update_every);
+                ect->flags &= ~NETDATA_EBPF_CGROUP_HAS_DC_CHART;
+            }
+        }
+    }
+
+    pthread_mutex_unlock(&mutex_cgroup_shm);
+}
+
+/**
+* Main loop for this collector.
+*/
+static void dcstat_collector(ebpf_module_t *em)
+{
+    netdata_publish_dcstat_t publish;
+    memset(&publish, 0, sizeof(publish));
+    int cgroups = em->cgroup_charts;
+    int update_every = em->update_every;
+    heartbeat_t hb;
+    heartbeat_init(&hb);
+    int counter = update_every - 1;
+    int maps_per_core = em->maps_per_core;
+    uint32_t running_time = 0;
+    uint32_t lifetime = em->lifetime;
+    netdata_idx_t *stats = em->hash_table_stats;
+    memset(stats, 0, sizeof(em->hash_table_stats));
+    while (!ebpf_plugin_exit && running_time < lifetime) {
+        (void)heartbeat_next(&hb, USEC_PER_SEC);
+
+        if (ebpf_plugin_exit || ++counter != update_every)
+            continue;
+
+        counter = 0;
+        netdata_apps_integration_flags_t apps = em->apps_charts;
+        ebpf_dc_read_global_tables(stats, maps_per_core);
+        pthread_mutex_lock(&collect_data_mutex);
+        if (apps)
+            read_dc_apps_table(maps_per_core);
+
+        if (cgroups)
+            ebpf_update_dc_cgroup(maps_per_core);
+
+        pthread_mutex_lock(&lock);
+
+        dcstat_send_global(&publish);
+
+        if (apps & NETDATA_EBPF_APPS_FLAG_CHART_CREATED)
+            ebpf_dcache_send_apps_data(apps_groups_root_target);
+
+#ifdef NETDATA_DEV_MODE
+        if (ebpf_aral_dcstat_pid)
+            ebpf_send_data_aral_chart(ebpf_aral_dcstat_pid, em);
+#endif
+
+        if (cgroups)
+            ebpf_dc_send_cgroup_data(update_every);
+
+        pthread_mutex_unlock(&lock);
+        pthread_mutex_unlock(&collect_data_mutex);
+
+        pthread_mutex_lock(&ebpf_exit_cleanup);
+        if (running_time && !em->running_time)
+            running_time = update_every;
+        else
+            running_time += update_every;
+
+        em->running_time = running_time;
+        pthread_mutex_unlock(&ebpf_exit_cleanup);
+    }
+}
+
+/*****************************************************************
+ *
+ *  INITIALIZE THREAD
+ *
+ *****************************************************************/
+
+/**
+ * Create filesystem charts
+ *
+ * Call ebpf_create_chart to create the charts for the collector.
+ *
+ * @param update_every value to overwrite the update frequency set by the server.
+ */
+static void ebpf_create_dc_global_charts(int update_every)
+{
+    ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_HIT_CHART,
+                      "Percentage of files inside directory cache",
+                      EBPF_COMMON_DIMENSION_PERCENTAGE, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NULL,
+                      NETDATA_EBPF_CHART_TYPE_LINE,
+                      21200,
+                      ebpf_create_global_dimension,
+                      dcstat_counter_publish_aggregated, 1, update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+
+    ebpf_create_chart(NETDATA_FILESYSTEM_FAMILY, NETDATA_DC_REFERENCE_CHART,
+                      "Variables used to calculate hit ratio.",
+                      EBPF_COMMON_DIMENSION_FILES, NETDATA_DIRECTORY_CACHE_SUBMENU,
+                      NULL,
+                      NETDATA_EBPF_CHART_TYPE_LINE,
+                      21201,
+                      ebpf_create_global_dimension,
+                      &dcstat_counter_publish_aggregated[NETDATA_DCSTAT_IDX_REFERENCE], 3,
+                      update_every, NETDATA_EBPF_MODULE_NAME_DCSTAT);
+
+    fflush(stdout);
+}
+
+/**
+ * Allocate vectors used with this thread.
+ *
+ * We are not testing the return, because callocz does this and shutdown the software
+ * case it was not possible to allocate.
+ *
+ * @param apps is apps enabled?
+ */
+static void ebpf_dcstat_allocate_global_vectors(int apps)
+{
+    if (apps) {
+        ebpf_dcstat_aral_init();
+        dcstat_pid = callocz((size_t)pid_max, sizeof(netdata_publish_dcstat_t *));
+        dcstat_vector = callocz((size_t)ebpf_nprocs, sizeof(netdata_dcstat_pid_t));
+    }
+
+    dcstat_values = callocz((size_t)ebpf_nprocs, sizeof(netdata_idx_t));
+
+    memset(dcstat_counter_aggregated_data, 0, NETDATA_DCSTAT_IDX_END * sizeof(netdata_syscall_stat_t));
+    memset(dcstat_counter_publish_aggregated, 0, NETDATA_DCSTAT_IDX_END * sizeof(netdata_publish_syscall_t));
+}
+
+/*****************************************************************
+ *
+ *  MAIN THREAD
+ *
+ *****************************************************************/
+
+/*
+ * Load BPF
+ *
+ * Load BPF files.
+ *
+ * @param em the structure with configuration
+ */
+static int ebpf_dcstat_load_bpf(ebpf_module_t *em)
+{
+#ifdef LIBBPF_MAJOR_VERSION
+    ebpf_define_map_type(dcstat_maps, em->maps_per_core, running_on_kernel);
+#endif
+
+    int ret = 0;
+    ebpf_adjust_apps_cgroup(em, em->targets[NETDATA_DC_TARGET_LOOKUP_FAST].mode);
+    if (em->load & EBPF_LOAD_LEGACY) {
+        em->probe_links = ebpf_load_program(ebpf_plugin_dir, em, running_on_kernel, isrh, &em->objects);
+        if (!em->probe_links) {
+            ret = -1;
+        }
+    }
+#ifdef LIBBPF_MAJOR_VERSION
+    else {
+        dc_bpf_obj = dc_bpf__open();
+        if (!dc_bpf_obj)
+            ret = -1;
+        else
+            ret = ebpf_dc_load_and_attach(dc_bpf_obj, em);
+    }
+#endif
+
+    if (ret)
+        netdata_log_error("%s %s", EBPF_DEFAULT_ERROR_MSG, em->info.thread_name);
+
+    return ret;
+}
+
+/**
+ * Directory Cache thread
+ *
+ * Thread used to make dcstat thread
+ *
+ * @param ptr a pointer to `struct ebpf_module`
+ *
+ * @return It always returns NULL
+ */
+void *ebpf_dcstat_thread(void *ptr)
+{
+    netdata_thread_cleanup_push(ebpf_dcstat_exit, ptr);
+
+    ebpf_module_t *em = (ebpf_module_t *)ptr;
+    em->maps = dcstat_maps;
+
+    ebpf_update_pid_table(&dcstat_maps[NETDATA_DCSTAT_PID_STATS], em);
+
+    ebpf_update_names(dc_optional_name, em);
+
+#ifdef LIBBPF_MAJOR_VERSION
+    ebpf_adjust_thread_load(em, default_btf);
+#endif
+    if (ebpf_dcstat_load_bpf(em)) {
+        goto enddcstat;
+    }
+
+    ebpf_dcstat_allocate_global_vectors(em->apps_charts);
+
+    int algorithms[NETDATA_DCSTAT_IDX_END] = {
+        NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_ABSOLUTE_IDX, NETDATA_EBPF_ABSOLUTE_IDX,
+        NETDATA_EBPF_ABSOLUTE_IDX
+    };
+
+    ebpf_global_labels(dcstat_counter_aggregated_data, dcstat_counter_publish_aggregated,
+                       dcstat_counter_dimension_name, dcstat_counter_dimension_name,
+                       algorithms, NETDATA_DCSTAT_IDX_END);
+
+    pthread_mutex_lock(&lock);
+    ebpf_create_dc_global_charts(em->update_every);
+    ebpf_update_stats(&plugin_statistics, em);
+    ebpf_update_kernel_memory_with_vector(&plugin_statistics, em->maps, EBPF_ACTION_STAT_ADD);
+#ifdef NETDATA_DEV_MODE
+    if (ebpf_aral_dcstat_pid)
+        dcstat_disable_priority = ebpf_statistic_create_aral_chart(NETDATA_EBPF_DCSTAT_ARAL_NAME, em);
+#endif
+
+    pthread_mutex_unlock(&lock);
+
+    dcstat_collector(em);
+
+enddcstat:
+    ebpf_update_disabled_plugin_stats(em);
+
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}