Adding upstream version 1.45.3+dfsg.upstream/1.45.3+dfsgupstream

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

1 files changed, 1663 insertions, 0 deletions

diff --git a/src/collectors/cgroups.plugin/sys_fs_cgroup.c b/src/collectors/cgroups.plugin/sys_fs_cgroup.c
new file mode 100644
index 000000000..fd30b4acc
--- /dev/null
+++ b/src/collectors/cgroups.plugin/sys_fs_cgroup.c
@@ -0,0 +1,1663 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "cgroup-internals.h"
+
+// main cgroups thread worker jobs
+#define WORKER_CGROUPS_LOCK 0
+#define WORKER_CGROUPS_READ 1
+#define WORKER_CGROUPS_CHART 2
+
+// ----------------------------------------------------------------------------
+// cgroup globals
+unsigned long long host_ram_total = 0;
+int is_inside_k8s = 0;
+long system_page_size = 4096; // system will be queried via sysconf() in configuration()
+int cgroup_enable_cpuacct_stat = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_cpuacct_usage = CONFIG_BOOLEAN_NO;
+int cgroup_enable_cpuacct_cpu_throttling = CONFIG_BOOLEAN_YES;
+int cgroup_enable_cpuacct_cpu_shares = CONFIG_BOOLEAN_NO;
+int cgroup_enable_memory = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_detailed_memory = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_memory_failcnt = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_swap = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_io = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_ops = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_throttle_io = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_throttle_ops = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_merged_ops = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_blkio_queued_ops = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_cpu = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_io_some = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_io_full = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_memory_some = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_memory_full = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_pressure_irq_some = CONFIG_BOOLEAN_NO;
+int cgroup_enable_pressure_irq_full = CONFIG_BOOLEAN_AUTO;
+int cgroup_enable_systemd_services = CONFIG_BOOLEAN_YES;
+int cgroup_enable_systemd_services_detailed_memory = CONFIG_BOOLEAN_NO;
+int cgroup_used_memory = CONFIG_BOOLEAN_YES;
+int cgroup_use_unified_cgroups = CONFIG_BOOLEAN_NO;
+int cgroup_unified_exist = CONFIG_BOOLEAN_AUTO;
+int cgroup_search_in_devices = 1;
+int cgroup_check_for_new_every = 10;
+int cgroup_update_every = 1;
+int cgroup_containers_chart_priority = NETDATA_CHART_PRIO_CGROUPS_CONTAINERS;
+int cgroup_recheck_zero_blkio_every_iterations = 10;
+int cgroup_recheck_zero_mem_failcnt_every_iterations = 10;
+int cgroup_recheck_zero_mem_detailed_every_iterations = 10;
+char *cgroup_cpuacct_base = NULL;
+char *cgroup_cpuset_base = NULL;
+char *cgroup_blkio_base = NULL;
+char *cgroup_memory_base = NULL;
+char *cgroup_devices_base = NULL;
+char *cgroup_pids_base = NULL;
+char *cgroup_unified_base = NULL;
+int cgroup_root_count = 0;
+int cgroup_root_max = 1000;
+int cgroup_max_depth = 0;
+SIMPLE_PATTERN *enabled_cgroup_paths = NULL;
+SIMPLE_PATTERN *enabled_cgroup_names = NULL;
+SIMPLE_PATTERN *search_cgroup_paths = NULL;
+SIMPLE_PATTERN *enabled_cgroup_renames = NULL;
+SIMPLE_PATTERN *systemd_services_cgroups = NULL;
+SIMPLE_PATTERN *entrypoint_parent_process_comm = NULL;
+char *cgroups_network_interface_script = NULL;
+int cgroups_check = 0;
+uint32_t Read_hash = 0;
+uint32_t Write_hash = 0;
+uint32_t user_hash = 0;
+uint32_t system_hash = 0;
+uint32_t user_usec_hash = 0;
+uint32_t system_usec_hash = 0;
+uint32_t nr_periods_hash = 0;
+uint32_t nr_throttled_hash = 0;
+uint32_t throttled_time_hash = 0;
+uint32_t throttled_usec_hash = 0;
+
+// *** WARNING *** The fields are not thread safe. Take care of safe usage.
+struct cgroup *cgroup_root = NULL;
+uv_mutex_t cgroup_root_mutex;
+
+struct cgroups_systemd_config_setting cgroups_systemd_options[] = {
+        { .name = "legacy",  .setting = SYSTEMD_CGROUP_LEGACY  },
+        { .name = "hybrid",  .setting = SYSTEMD_CGROUP_HYBRID  },
+        { .name = "unified", .setting = SYSTEMD_CGROUP_UNIFIED },
+        { .name = NULL,      .setting = SYSTEMD_CGROUP_ERR     },
+};
+
+struct discovery_thread discovery_thread;
+
+
+/* on Fed systemd is not in PATH for some reason */
+#define SYSTEMD_CMD_RHEL "/usr/lib/systemd/systemd --version"
+#define SYSTEMD_HIERARCHY_STRING "default-hierarchy="
+
+#define MAXSIZE_PROC_CMDLINE 4096
+static enum cgroups_systemd_setting cgroups_detect_systemd(const char *exec)
+{
+    pid_t command_pid;
+    enum cgroups_systemd_setting retval = SYSTEMD_CGROUP_ERR;
+    char buf[MAXSIZE_PROC_CMDLINE];
+    char *begin, *end;
+
+    FILE *fp_child_input;
+    FILE *fp_child_output = netdata_popen(exec, &command_pid, &fp_child_input);
+
+    if (!fp_child_output)
+        return retval;
+
+    fd_set rfds;
+    struct timeval timeout;
+    int fd = fileno(fp_child_output);
+    int ret = -1;
+
+    FD_ZERO(&rfds);
+    FD_SET(fd, &rfds);
+    timeout.tv_sec = 3;
+    timeout.tv_usec = 0;
+
+    if (fd != -1) {
+        ret = select(fd + 1, &rfds, NULL, NULL, &timeout);
+    }
+
+    if (ret == -1) {
+        collector_error("Failed to get the output of \"%s\"", exec);
+    } else if (ret == 0) {
+        collector_info("Cannot get the output of \"%s\" within %"PRId64" seconds", exec, (int64_t)timeout.tv_sec);
+    } else {
+        while (fgets(buf, MAXSIZE_PROC_CMDLINE, fp_child_output) != NULL) {
+            if ((begin = strstr(buf, SYSTEMD_HIERARCHY_STRING))) {
+                end = begin = begin + strlen(SYSTEMD_HIERARCHY_STRING);
+                if (!*begin)
+                    break;
+                while (isalpha(*end))
+                    end++;
+                *end = 0;
+                for (int i = 0; cgroups_systemd_options[i].name; i++) {
+                    if (!strcmp(begin, cgroups_systemd_options[i].name)) {
+                        retval = cgroups_systemd_options[i].setting;
+                        break;
+                    }
+                }
+                break;
+            }
+        }
+    }
+
+    if (netdata_pclose(fp_child_input, fp_child_output, command_pid))
+        return SYSTEMD_CGROUP_ERR;
+
+    return retval;
+}
+
+static enum cgroups_type cgroups_try_detect_version()
+{
+    pid_t command_pid;
+    char buf[MAXSIZE_PROC_CMDLINE];
+    enum cgroups_systemd_setting systemd_setting;
+    int cgroups2_available = 0;
+
+    // 1. check if cgroups2 available on system at all
+    FILE *fp_child_input;
+    FILE *fp_child_output = netdata_popen("grep cgroup /proc/filesystems", &command_pid, &fp_child_input);
+    if (!fp_child_output) {
+        collector_error("popen failed");
+        return CGROUPS_AUTODETECT_FAIL;
+    }
+    while (fgets(buf, MAXSIZE_PROC_CMDLINE, fp_child_output) != NULL) {
+        if (strstr(buf, "cgroup2")) {
+            cgroups2_available = 1;
+            break;
+        }
+    }
+    if(netdata_pclose(fp_child_input, fp_child_output, command_pid))
+        return CGROUPS_AUTODETECT_FAIL;
+
+    if(!cgroups2_available)
+        return CGROUPS_V1;
+
+#if defined CGROUP2_SUPER_MAGIC
+    // 2. check filesystem type for the default mountpoint
+    char filename[FILENAME_MAX + 1];
+    snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/sys/fs/cgroup");
+    struct statfs fsinfo;
+    if (!statfs(filename, &fsinfo)) {
+        if (fsinfo.f_type == CGROUP2_SUPER_MAGIC)
+            return CGROUPS_V2;
+    }
+#endif
+
+    // 3. check systemd compiletime setting
+    if ((systemd_setting = cgroups_detect_systemd("systemd --version")) == SYSTEMD_CGROUP_ERR)
+        systemd_setting = cgroups_detect_systemd(SYSTEMD_CMD_RHEL);
+
+    if(systemd_setting == SYSTEMD_CGROUP_ERR)
+        return CGROUPS_AUTODETECT_FAIL;
+
+    if(systemd_setting == SYSTEMD_CGROUP_LEGACY || systemd_setting == SYSTEMD_CGROUP_HYBRID) {
+        // currently we prefer V1 if HYBRID is set as it seems to be more feature complete
+        // in the future we might want to continue here if SYSTEMD_CGROUP_HYBRID
+        // and go ahead with V2
+        return CGROUPS_V1;
+    }
+
+    // 4. if we are unified as on Fedora (default cgroups2 only mode)
+    //    check kernel command line flag that can override that setting
+    FILE *fp = fopen("/proc/cmdline", "r");
+    if (!fp) {
+        collector_error("Error reading kernel boot commandline parameters");
+        return CGROUPS_AUTODETECT_FAIL;
+    }
+
+    if (!fgets(buf, MAXSIZE_PROC_CMDLINE, fp)) {
+        collector_error("couldn't read all cmdline params into buffer");
+        fclose(fp);
+        return CGROUPS_AUTODETECT_FAIL;
+    }
+
+    fclose(fp);
+
+    if (strstr(buf, "systemd.unified_cgroup_hierarchy=0")) {
+        collector_info("cgroups v2 (unified cgroups) is available but are disabled on this system.");
+        return CGROUPS_V1;
+    }
+    return CGROUPS_V2;
+}
+
+void set_cgroup_base_path(char *filename, char *path) {
+    if (strncmp(netdata_configured_host_prefix, path, strlen(netdata_configured_host_prefix)) == 0) {
+        snprintfz(filename, FILENAME_MAX, "%s", path);
+    } else {
+        snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, path);
+    }
+}
+
+void read_cgroup_plugin_configuration() {
+    system_page_size = sysconf(_SC_PAGESIZE);
+
+    Read_hash = simple_hash("Read");
+    Write_hash = simple_hash("Write");
+    user_hash = simple_hash("user");
+    system_hash = simple_hash("system");
+    user_usec_hash = simple_hash("user_usec");
+    system_usec_hash = simple_hash("system_usec");
+    nr_periods_hash = simple_hash("nr_periods");
+    nr_throttled_hash = simple_hash("nr_throttled");
+    throttled_time_hash = simple_hash("throttled_time");
+    throttled_usec_hash = simple_hash("throttled_usec");
+
+    cgroup_update_every = (int)config_get_number("plugin:cgroups", "update every", localhost->rrd_update_every);
+    if(cgroup_update_every < localhost->rrd_update_every)
+        cgroup_update_every = localhost->rrd_update_every;
+
+    cgroup_check_for_new_every = (int)config_get_number("plugin:cgroups", "check for new cgroups every", cgroup_check_for_new_every);
+    if(cgroup_check_for_new_every < cgroup_update_every)
+        cgroup_check_for_new_every = cgroup_update_every;
+
+    cgroup_use_unified_cgroups = config_get_boolean_ondemand("plugin:cgroups", "use unified cgroups", CONFIG_BOOLEAN_AUTO);
+    if(cgroup_use_unified_cgroups == CONFIG_BOOLEAN_AUTO)
+        cgroup_use_unified_cgroups = (cgroups_try_detect_version() == CGROUPS_V2);
+
+    collector_info("use unified cgroups %s", cgroup_use_unified_cgroups ? "true" : "false");
+
+    cgroup_containers_chart_priority = (int)config_get_number("plugin:cgroups", "containers priority", cgroup_containers_chart_priority);
+    if(cgroup_containers_chart_priority < 1)
+        cgroup_containers_chart_priority = NETDATA_CHART_PRIO_CGROUPS_CONTAINERS;
+
+    cgroup_enable_cpuacct_stat = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct stat (total CPU)", cgroup_enable_cpuacct_stat);
+    cgroup_enable_cpuacct_usage = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct usage (per core CPU)", cgroup_enable_cpuacct_usage);
+    cgroup_enable_cpuacct_cpu_throttling = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct cpu throttling", cgroup_enable_cpuacct_cpu_throttling);
+    cgroup_enable_cpuacct_cpu_shares = config_get_boolean_ondemand("plugin:cgroups", "enable cpuacct cpu shares", cgroup_enable_cpuacct_cpu_shares);
+
+    cgroup_enable_memory = config_get_boolean_ondemand("plugin:cgroups", "enable memory", cgroup_enable_memory);
+    cgroup_enable_detailed_memory = config_get_boolean_ondemand("plugin:cgroups", "enable detailed memory", cgroup_enable_detailed_memory);
+    cgroup_enable_memory_failcnt = config_get_boolean_ondemand("plugin:cgroups", "enable memory limits fail count", cgroup_enable_memory_failcnt);
+    cgroup_enable_swap = config_get_boolean_ondemand("plugin:cgroups", "enable swap memory", cgroup_enable_swap);
+
+    cgroup_enable_blkio_io = config_get_boolean_ondemand("plugin:cgroups", "enable blkio bandwidth", cgroup_enable_blkio_io);
+    cgroup_enable_blkio_ops = config_get_boolean_ondemand("plugin:cgroups", "enable blkio operations", cgroup_enable_blkio_ops);
+    cgroup_enable_blkio_throttle_io = config_get_boolean_ondemand("plugin:cgroups", "enable blkio throttle bandwidth", cgroup_enable_blkio_throttle_io);
+    cgroup_enable_blkio_throttle_ops = config_get_boolean_ondemand("plugin:cgroups", "enable blkio throttle operations", cgroup_enable_blkio_throttle_ops);
+    cgroup_enable_blkio_queued_ops = config_get_boolean_ondemand("plugin:cgroups", "enable blkio queued operations", cgroup_enable_blkio_queued_ops);
+    cgroup_enable_blkio_merged_ops = config_get_boolean_ondemand("plugin:cgroups", "enable blkio merged operations", cgroup_enable_blkio_merged_ops);
+
+    cgroup_enable_pressure_cpu = config_get_boolean_ondemand("plugin:cgroups", "enable cpu pressure", cgroup_enable_pressure_cpu);
+    cgroup_enable_pressure_io_some = config_get_boolean_ondemand("plugin:cgroups", "enable io some pressure", cgroup_enable_pressure_io_some);
+    cgroup_enable_pressure_io_full = config_get_boolean_ondemand("plugin:cgroups", "enable io full pressure", cgroup_enable_pressure_io_full);
+    cgroup_enable_pressure_memory_some = config_get_boolean_ondemand("plugin:cgroups", "enable memory some pressure", cgroup_enable_pressure_memory_some);
+    cgroup_enable_pressure_memory_full = config_get_boolean_ondemand("plugin:cgroups", "enable memory full pressure", cgroup_enable_pressure_memory_full);
+
+    cgroup_recheck_zero_blkio_every_iterations = (int)config_get_number("plugin:cgroups", "recheck zero blkio every iterations", cgroup_recheck_zero_blkio_every_iterations);
+    cgroup_recheck_zero_mem_failcnt_every_iterations = (int)config_get_number("plugin:cgroups", "recheck zero memory failcnt every iterations", cgroup_recheck_zero_mem_failcnt_every_iterations);
+    cgroup_recheck_zero_mem_detailed_every_iterations = (int)config_get_number("plugin:cgroups", "recheck zero detailed memory every iterations", cgroup_recheck_zero_mem_detailed_every_iterations);
+
+    cgroup_enable_systemd_services = config_get_boolean("plugin:cgroups", "enable systemd services", cgroup_enable_systemd_services);
+    cgroup_enable_systemd_services_detailed_memory = config_get_boolean("plugin:cgroups", "enable systemd services detailed memory", cgroup_enable_systemd_services_detailed_memory);
+    cgroup_used_memory = config_get_boolean("plugin:cgroups", "report used memory", cgroup_used_memory);
+
+    char filename[FILENAME_MAX + 1], *s;
+    struct mountinfo *mi, *root = mountinfo_read(0);
+    if(!cgroup_use_unified_cgroups) {
+        // cgroup v1 does not have pressure metrics
+        cgroup_enable_pressure_cpu =
+        cgroup_enable_pressure_io_some =
+        cgroup_enable_pressure_io_full =
+        cgroup_enable_pressure_memory_some =
+        cgroup_enable_pressure_memory_full = CONFIG_BOOLEAN_NO;
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "cpuacct");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "cpuacct");
+        if (!mi) {
+            collector_error("CGROUP: cannot find cpuacct mountinfo. Assuming default: /sys/fs/cgroup/cpuacct");
+            s = "/sys/fs/cgroup/cpuacct";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_cpuacct_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/cpuacct", filename);
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "cpuset");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "cpuset");
+        if (!mi) {
+            collector_error("CGROUP: cannot find cpuset mountinfo. Assuming default: /sys/fs/cgroup/cpuset");
+            s = "/sys/fs/cgroup/cpuset";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_cpuset_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/cpuset", filename);
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "blkio");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "blkio");
+        if (!mi) {
+            collector_error("CGROUP: cannot find blkio mountinfo. Assuming default: /sys/fs/cgroup/blkio");
+            s = "/sys/fs/cgroup/blkio";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_blkio_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/blkio", filename);
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "memory");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "memory");
+        if (!mi) {
+            collector_error("CGROUP: cannot find memory mountinfo. Assuming default: /sys/fs/cgroup/memory");
+            s = "/sys/fs/cgroup/memory";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_memory_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/memory", filename);
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "devices");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "devices");
+        if (!mi) {
+            collector_error("CGROUP: cannot find devices mountinfo. Assuming default: /sys/fs/cgroup/devices");
+            s = "/sys/fs/cgroup/devices";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_devices_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/devices", filename);
+
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup", "pids");
+        if (!mi)
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup", "pids");
+        if (!mi) {
+            collector_error("CGROUP: cannot find pids mountinfo. Assuming default: /sys/fs/cgroup/pids");
+            s = "/sys/fs/cgroup/pids";
+        } else
+            s = mi->mount_point;
+        set_cgroup_base_path(filename, s);
+        cgroup_pids_base = config_get("plugin:cgroups", "path to /sys/fs/cgroup/pids", filename);
+    }
+    else {
+        //cgroup_enable_cpuacct_stat =
+        cgroup_enable_cpuacct_usage =
+        //cgroup_enable_memory =
+        //cgroup_enable_detailed_memory =
+        cgroup_enable_memory_failcnt =
+        //cgroup_enable_swap =
+        //cgroup_enable_blkio_io =
+        //cgroup_enable_blkio_ops =
+        cgroup_enable_blkio_throttle_io =
+        cgroup_enable_blkio_throttle_ops =
+        cgroup_enable_blkio_merged_ops =
+        cgroup_enable_blkio_queued_ops = CONFIG_BOOLEAN_NO;
+        cgroup_search_in_devices = 0;
+        cgroup_enable_systemd_services_detailed_memory = CONFIG_BOOLEAN_NO;
+        cgroup_used_memory = CONFIG_BOOLEAN_NO; //unified cgroups use different values
+
+        //TODO: can there be more than 1 cgroup2 mount point?
+        //there is no cgroup2 specific super option - for now use 'rw' option
+        mi = mountinfo_find_by_filesystem_super_option(root, "cgroup2", "rw");
+        if (!mi) {
+            mi = mountinfo_find_by_filesystem_mount_source(root, "cgroup2", "cgroup");
+        }
+        if (!mi) {
+            collector_error("CGROUP: cannot find cgroup2 mountinfo. Assuming default: /sys/fs/cgroup");
+            s = "/sys/fs/cgroup";
+        } else
+            s = mi->mount_point;
+
+        set_cgroup_base_path(filename, s);
+        cgroup_unified_base = config_get("plugin:cgroups", "path to unified cgroups", filename);
+    }
+
+    cgroup_root_max = (int)config_get_number("plugin:cgroups", "max cgroups to allow", cgroup_root_max);
+    cgroup_max_depth = (int)config_get_number("plugin:cgroups", "max cgroups depth to monitor", cgroup_max_depth);
+
+    enabled_cgroup_paths = simple_pattern_create(
+            config_get("plugin:cgroups", "enable by default cgroups matching",
+            // ----------------------------------------------------------------
+
+                       " !*/init.scope "                      // ignore init.scope
+                       " !/system.slice/run-*.scope "         // ignore system.slice/run-XXXX.scope
+                       " *user.slice/docker-*"                // allow docker rootless containers
+                       " !*user.slice*"                       // ignore the rest stuff in user.slice 
+                       " *.scope "                            // we need all other *.scope for sure
+
+                       // ----------------------------------------------------------------
+
+                       " /machine.slice/*.service "           // #3367 systemd-nspawn
+
+                       // ----------------------------------------------------------------
+
+                       " */kubepods/pod*/* "                   // k8s containers
+                       " */kubepods/*/pod*/* "                 // k8s containers
+                       " */*-kubepods-pod*/* "                 // k8s containers
+                       " */*-kubepods-*-pod*/* "               // k8s containers
+                       " !*kubepods* !*kubelet* "              // all other k8s cgroups
+
+                       // ----------------------------------------------------------------
+
+                       " !*/vcpu* "                           // libvirtd adds these sub-cgroups
+                       " !*/emulator "                        // libvirtd adds these sub-cgroups
+                       " !*.mount "
+                       " !*.partition "
+                       " !*.service "
+                       " !*.service/udev "
+                       " !*.socket "
+                       " !*.slice "
+                       " !*.swap "
+                       " !*.user "
+                       " !/ "
+                       " !/docker "
+                       " !*/libvirt "
+                       " !/lxc "
+                       " !/lxc/*/* "                          //  #1397 #2649
+                       " !/lxc.monitor* "
+                       " !/lxc.pivot "
+                       " !/lxc.payload "
+                       " !*lxcfs.service/.control"
+                       " !/machine "
+                       " !/qemu "
+                       " !/system "
+                       " !/systemd "
+                       " !/user "
+                       " * "                                  // enable anything else
+            ), NULL, SIMPLE_PATTERN_EXACT, true);
+
+    enabled_cgroup_names = simple_pattern_create(
+            config_get("plugin:cgroups", "enable by default cgroups names matching",
+                       " * "
+            ), NULL, SIMPLE_PATTERN_EXACT, true);
+
+    search_cgroup_paths = simple_pattern_create(
+            config_get("plugin:cgroups", "search for cgroups in subpaths matching",
+                       " !*/init.scope "                      // ignore init.scope
+                       " !*-qemu "                            //  #345
+                       " !*.libvirt-qemu "                    //  #3010
+                       " !/init.scope "
+                       " !/system "
+                       " !/systemd "
+                       " !/user "
+                       " !/lxc/*/* "                          //  #2161 #2649
+                       " !/lxc.monitor "
+                       " !/lxc.payload/*/* "
+                       " !/lxc.payload.* "
+                       " * "
+            ), NULL, SIMPLE_PATTERN_EXACT, true);
+
+    snprintfz(filename, FILENAME_MAX, "%s/cgroup-name.sh", netdata_configured_primary_plugins_dir);
+    cgroups_rename_script = config_get("plugin:cgroups", "script to get cgroup names", filename);
+
+    snprintfz(filename, FILENAME_MAX, "%s/cgroup-network", netdata_configured_primary_plugins_dir);
+    cgroups_network_interface_script = config_get("plugin:cgroups", "script to get cgroup network interfaces", filename);
+
+    enabled_cgroup_renames = simple_pattern_create(
+            config_get("plugin:cgroups", "run script to rename cgroups matching",
+                       " !/ "
+                       " !*.mount "
+                       " !*.socket "
+                       " !*.partition "
+                       " /machine.slice/*.service "          // #3367 systemd-nspawn
+                       " !*.service "
+                       " !*.slice "
+                       " !*.swap "
+                       " !*.user "
+                       " !init.scope "
+                       " !*.scope/vcpu* "                    // libvirtd adds these sub-cgroups
+                       " !*.scope/emulator "                 // libvirtd adds these sub-cgroups
+                       " *.scope "
+                       " *docker* "
+                       " *lxc* "
+                       " *qemu* "
+                       " */kubepods/pod*/* "                   // k8s containers
+                       " */kubepods/*/pod*/* "                 // k8s containers
+                       " */*-kubepods-pod*/* "                 // k8s containers
+                       " */*-kubepods-*-pod*/* "               // k8s containers
+                       " !*kubepods* !*kubelet* "              // all other k8s cgroups
+                       " *.libvirt-qemu "                    // #3010
+                       " * "
+            ), NULL, SIMPLE_PATTERN_EXACT, true);
+
+    if(cgroup_enable_systemd_services) {
+        systemd_services_cgroups = simple_pattern_create(
+                config_get("plugin:cgroups", "cgroups to match as systemd services",
+                           " !/system.slice/*/*.service "
+                           " /system.slice/*.service "
+                ), NULL, SIMPLE_PATTERN_EXACT, true);
+    }
+
+    mountinfo_free_all(root);
+}
+
+// ---------------------------------------------------------------------------------------------
+
+static unsigned long long calc_delta(unsigned long long curr, unsigned long long prev) {
+    if (prev > curr) {
+        return 0;
+    }
+    return curr - prev;
+}
+
+static unsigned long long calc_percentage(unsigned long long value, unsigned long long total) {
+    if (total == 0) {
+        return 0;
+    }
+    return (unsigned long long)((NETDATA_DOUBLE)value / (NETDATA_DOUBLE)total * 100);
+}
+
+// ----------------------------------------------------------------------------
+// read values from /sys
+
+static inline void cgroup_read_cpuacct_stat(struct cpuacct_stat *cp) {
+    static procfile *ff = NULL;
+
+    if(likely(cp->filename)) {
+        ff = procfile_reopen(ff, cp->filename, NULL, CGROUP_PROCFILE_FLAG);
+        if(unlikely(!ff)) {
+            cp->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        ff = procfile_readall(ff);
+        if(unlikely(!ff)) {
+            cp->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        unsigned long i, lines = procfile_lines(ff);
+
+        if(unlikely(lines < 1)) {
+            collector_error("CGROUP: file '%s' should have 1+ lines.", cp->filename);
+            cp->updated = 0;
+            return;
+        }
+
+        for(i = 0; i < lines ; i++) {
+            char *s = procfile_lineword(ff, i, 0);
+            uint32_t hash = simple_hash(s);
+
+            if(unlikely(hash == user_hash && !strcmp(s, "user")))
+                cp->user = str2ull(procfile_lineword(ff, i, 1), NULL);
+
+            else if(unlikely(hash == system_hash && !strcmp(s, "system")))
+                cp->system = str2ull(procfile_lineword(ff, i, 1), NULL);
+        }
+
+        cp->updated = 1;
+
+        if(unlikely(cp->enabled == CONFIG_BOOLEAN_AUTO &&
+                    (cp->user || cp->system || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)))
+            cp->enabled = CONFIG_BOOLEAN_YES;
+    }
+}
+
+static inline void cgroup_read_cpuacct_cpu_stat(struct cpuacct_cpu_throttling *cp) {
+    if (unlikely(!cp->filename)) {
+        return;
+    }
+
+    static procfile *ff = NULL;
+    ff = procfile_reopen(ff, cp->filename, NULL, CGROUP_PROCFILE_FLAG);
+    if (unlikely(!ff)) {
+        cp->updated = 0;
+        cgroups_check = 1;
+        return;
+    }
+
+    ff = procfile_readall(ff);
+    if (unlikely(!ff)) {
+        cp->updated = 0;
+        cgroups_check = 1;
+        return;
+    }
+
+    unsigned long lines = procfile_lines(ff);
+    if (unlikely(lines < 3)) {
+        collector_error("CGROUP: file '%s' should have 3 lines.", cp->filename);
+        cp->updated = 0;
+        return;
+    }
+
+    unsigned long long nr_periods_last = cp->nr_periods; 
+    unsigned long long nr_throttled_last = cp->nr_throttled; 
+
+    for (unsigned long i = 0; i < lines; i++) {
+        char *s = procfile_lineword(ff, i, 0);
+        uint32_t hash = simple_hash(s);
+
+        if (unlikely(hash == nr_periods_hash && !strcmp(s, "nr_periods"))) {
+            cp->nr_periods = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == nr_throttled_hash && !strcmp(s, "nr_throttled"))) {
+            cp->nr_throttled = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == throttled_time_hash && !strcmp(s, "throttled_time"))) {
+            cp->throttled_time = str2ull(procfile_lineword(ff, i, 1), NULL);
+        }
+    }
+    cp->nr_throttled_perc =
+        calc_percentage(calc_delta(cp->nr_throttled, nr_throttled_last), calc_delta(cp->nr_periods, nr_periods_last));
+
+    cp->updated = 1;
+
+    if (unlikely(cp->enabled == CONFIG_BOOLEAN_AUTO)) {
+        if (likely(
+                cp->nr_periods || cp->nr_throttled || cp->throttled_time ||
+                netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)) {
+            cp->enabled = CONFIG_BOOLEAN_YES;
+        }
+    }
+}
+
+static inline void cgroup2_read_cpuacct_cpu_stat(struct cpuacct_stat *cp, struct cpuacct_cpu_throttling *cpt) {
+    static procfile *ff = NULL;
+    if (unlikely(!cp->filename)) {
+        return;
+    }
+
+    ff = procfile_reopen(ff, cp->filename, NULL, CGROUP_PROCFILE_FLAG);
+    if (unlikely(!ff)) {
+        cp->updated = 0;
+        cgroups_check = 1;
+        return;
+    }
+
+    ff = procfile_readall(ff);
+    if (unlikely(!ff)) {
+        cp->updated = 0;
+        cgroups_check = 1;
+        return;
+    }
+
+    unsigned long lines = procfile_lines(ff);
+
+    if (unlikely(lines < 3)) {
+        collector_error("CGROUP: file '%s' should have at least 3 lines.", cp->filename);
+        cp->updated = 0;
+        return;
+    }
+
+    unsigned long long nr_periods_last = cpt->nr_periods; 
+    unsigned long long nr_throttled_last = cpt->nr_throttled; 
+
+    for (unsigned long i = 0; i < lines; i++) {
+        char *s = procfile_lineword(ff, i, 0);
+        uint32_t hash = simple_hash(s);
+
+        if (unlikely(hash == user_usec_hash && !strcmp(s, "user_usec"))) {
+            cp->user = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == system_usec_hash && !strcmp(s, "system_usec"))) {
+            cp->system = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == nr_periods_hash && !strcmp(s, "nr_periods"))) {
+            cpt->nr_periods = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == nr_throttled_hash && !strcmp(s, "nr_throttled"))) {
+            cpt->nr_throttled = str2ull(procfile_lineword(ff, i, 1), NULL);
+        } else if (unlikely(hash == throttled_usec_hash && !strcmp(s, "throttled_usec"))) {
+            cpt->throttled_time = str2ull(procfile_lineword(ff, i, 1), NULL) * 1000; // usec -> ns
+        }
+    }
+    cpt->nr_throttled_perc =
+        calc_percentage(calc_delta(cpt->nr_throttled, nr_throttled_last), calc_delta(cpt->nr_periods, nr_periods_last));
+
+    cp->updated = 1;
+    cpt->updated = 1;
+
+    if (unlikely(cp->enabled == CONFIG_BOOLEAN_AUTO)) {
+        if (likely(cp->user || cp->system || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)) {
+            cp->enabled = CONFIG_BOOLEAN_YES;
+        }
+    }
+    if (unlikely(cpt->enabled == CONFIG_BOOLEAN_AUTO)) {
+        if (likely(
+                cpt->nr_periods || cpt->nr_throttled || cpt->throttled_time ||
+                netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)) {
+            cpt->enabled = CONFIG_BOOLEAN_YES;
+        }
+    }
+}
+
+static inline void cgroup_read_cpuacct_cpu_shares(struct cpuacct_cpu_shares *cp) {
+    if (unlikely(!cp->filename)) {
+        return;
+    }
+
+    if (unlikely(read_single_number_file(cp->filename, &cp->shares))) {
+        cp->updated = 0;
+        cgroups_check = 1;
+        return;
+    }
+
+    cp->updated = 1;
+    if (unlikely((cp->enabled == CONFIG_BOOLEAN_AUTO)) &&
+        (cp->shares || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)) {
+        cp->enabled = CONFIG_BOOLEAN_YES;
+    }
+}
+
+static inline void cgroup_read_cpuacct_usage(struct cpuacct_usage *ca) {
+    static procfile *ff = NULL;
+
+    if(likely(ca->filename)) {
+        ff = procfile_reopen(ff, ca->filename, NULL, CGROUP_PROCFILE_FLAG);
+        if(unlikely(!ff)) {
+            ca->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        ff = procfile_readall(ff);
+        if(unlikely(!ff)) {
+            ca->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        if(unlikely(procfile_lines(ff) < 1)) {
+            collector_error("CGROUP: file '%s' should have 1+ lines but has %zu.", ca->filename, procfile_lines(ff));
+            ca->updated = 0;
+            return;
+        }
+
+        unsigned long i = procfile_linewords(ff, 0);
+        if(unlikely(i == 0)) {
+            ca->updated = 0;
+            return;
+        }
+
+        // we may have 1 more CPU reported
+        while(i > 0) {
+            char *s = procfile_lineword(ff, 0, i - 1);
+            if(!*s) i--;
+            else break;
+        }
+
+        if(unlikely(i != ca->cpus)) {
+            freez(ca->cpu_percpu);
+            ca->cpu_percpu = mallocz(sizeof(unsigned long long) * i);
+            ca->cpus = (unsigned int)i;
+        }
+
+        unsigned long long total = 0;
+        for(i = 0; i < ca->cpus ;i++) {
+            unsigned long long n = str2ull(procfile_lineword(ff, 0, i), NULL);
+            ca->cpu_percpu[i] = n;
+            total += n;
+        }
+
+        ca->updated = 1;
+
+        if(unlikely(ca->enabled == CONFIG_BOOLEAN_AUTO &&
+                    (total || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)))
+            ca->enabled = CONFIG_BOOLEAN_YES;
+    }
+}
+
+static inline void cgroup_read_blkio(struct blkio *io) {
+    if(unlikely(io->enabled == CONFIG_BOOLEAN_AUTO && io->delay_counter > 0)) {
+        io->delay_counter--;
+        return;
+    }
+
+    if(likely(io->filename)) {
+        static procfile *ff = NULL;
+
+        ff = procfile_reopen(ff, io->filename, NULL, CGROUP_PROCFILE_FLAG);
+        if(unlikely(!ff)) {
+            io->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        ff = procfile_readall(ff);
+        if(unlikely(!ff)) {
+            io->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        unsigned long i, lines = procfile_lines(ff);
+
+        if(unlikely(lines < 1)) {
+            collector_error("CGROUP: file '%s' should have 1+ lines.", io->filename);
+            io->updated = 0;
+            return;
+        }
+
+        io->Read = 0;
+        io->Write = 0;
+/*
+        io->Sync = 0;
+        io->Async = 0;
+        io->Total = 0;
+*/
+
+        for(i = 0; i < lines ; i++) {
+            char *s = procfile_lineword(ff, i, 1);
+            uint32_t hash = simple_hash(s);
+
+            if(unlikely(hash == Read_hash && !strcmp(s, "Read")))
+                io->Read += str2ull(procfile_lineword(ff, i, 2), NULL);
+
+            else if(unlikely(hash == Write_hash && !strcmp(s, "Write")))
+                io->Write += str2ull(procfile_lineword(ff, i, 2), NULL);
+
+/*
+            else if(unlikely(hash == Sync_hash && !strcmp(s, "Sync")))
+                io->Sync += str2ull(procfile_lineword(ff, i, 2));
+
+            else if(unlikely(hash == Async_hash && !strcmp(s, "Async")))
+                io->Async += str2ull(procfile_lineword(ff, i, 2));
+
+            else if(unlikely(hash == Total_hash && !strcmp(s, "Total")))
+                io->Total += str2ull(procfile_lineword(ff, i, 2));
+*/
+        }
+
+        io->updated = 1;
+
+        if(unlikely(io->enabled == CONFIG_BOOLEAN_AUTO)) {
+            if(unlikely(io->Read || io->Write || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))
+                io->enabled = CONFIG_BOOLEAN_YES;
+            else
+                io->delay_counter = cgroup_recheck_zero_blkio_every_iterations;
+        }
+    }
+}
+
+static inline void cgroup2_read_blkio(struct blkio *io, unsigned int word_offset) {
+    if(unlikely(io->enabled == CONFIG_BOOLEAN_AUTO && io->delay_counter > 0)) {
+            io->delay_counter--;
+            return;
+        }
+
+        if(likely(io->filename)) {
+            static procfile *ff = NULL;
+
+            ff = procfile_reopen(ff, io->filename, NULL, CGROUP_PROCFILE_FLAG);
+            if(unlikely(!ff)) {
+                io->updated = 0;
+                cgroups_check = 1;
+                return;
+            }
+
+            ff = procfile_readall(ff);
+            if(unlikely(!ff)) {
+                io->updated = 0;
+                cgroups_check = 1;
+                return;
+            }
+
+            unsigned long i, lines = procfile_lines(ff);
+
+            if (unlikely(lines < 1)) {
+                collector_error("CGROUP: file '%s' should have 1+ lines.", io->filename);
+                io->updated = 0;
+                return;
+            }
+
+            io->Read = 0;
+            io->Write = 0;
+
+            for (i = 0; i < lines; i++) {
+                io->Read += str2ull(procfile_lineword(ff, i, 2 + word_offset), NULL);
+                io->Write += str2ull(procfile_lineword(ff, i, 4 + word_offset), NULL);
+            }
+
+            io->updated = 1;
+
+            if(unlikely(io->enabled == CONFIG_BOOLEAN_AUTO)) {
+                if(unlikely(io->Read || io->Write || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))
+                    io->enabled = CONFIG_BOOLEAN_YES;
+                else
+                    io->delay_counter = cgroup_recheck_zero_blkio_every_iterations;
+            }
+        }
+}
+
+static inline void cgroup2_read_pressure(struct pressure *res) {
+    static procfile *ff = NULL;
+
+    if (likely(res->filename)) {
+        ff = procfile_reopen(ff, res->filename, " =", CGROUP_PROCFILE_FLAG);
+        if (unlikely(!ff)) {
+            res->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        ff = procfile_readall(ff);
+        if (unlikely(!ff)) {
+            res->updated = 0;
+            cgroups_check = 1;
+            return;
+        }
+
+        size_t lines = procfile_lines(ff);
+        if (lines < 1) {
+            collector_error("CGROUP: file '%s' should have 1+ lines.", res->filename);
+            res->updated = 0;
+            return;
+        }
+
+        bool did_some = false, did_full = false;
+
+        for(size_t l = 0; l < lines ;l++) {
+            const char *key = procfile_lineword(ff, l, 0);
+            if(strcmp(key, "some") == 0) {
+                res->some.share_time.value10 = strtod(procfile_lineword(ff, l, 2), NULL);
+                res->some.share_time.value60 = strtod(procfile_lineword(ff, l, 4), NULL);
+                res->some.share_time.value300 = strtod(procfile_lineword(ff, l, 6), NULL);
+                res->some.total_time.value_total = str2ull(procfile_lineword(ff, l, 8), NULL) / 1000; // us->ms
+                did_some = true;
+            }
+            else if(strcmp(key, "full") == 0) {
+                res->full.share_time.value10 = strtod(procfile_lineword(ff, l, 2), NULL);
+                res->full.share_time.value60 = strtod(procfile_lineword(ff, l, 4), NULL);
+                res->full.share_time.value300 = strtod(procfile_lineword(ff, l, 6), NULL);
+                res->full.total_time.value_total = str2ull(procfile_lineword(ff, l, 8), NULL) / 1000; // us->ms
+                did_full = true;
+            }
+        }
+
+        res->updated = (did_full || did_some) ? 1 : 0;
+
+        if(unlikely(res->some.enabled == CONFIG_BOOLEAN_AUTO))
+            res->some.enabled = (did_some) ? CONFIG_BOOLEAN_YES : CONFIG_BOOLEAN_NO;
+
+        if(unlikely(res->full.enabled == CONFIG_BOOLEAN_AUTO))
+            res->full.enabled = (did_full) ? CONFIG_BOOLEAN_YES : CONFIG_BOOLEAN_NO;
+    }
+}
+
+static inline void cgroup_read_memory(struct memory *mem, char parent_cg_is_unified) {
+    static procfile *ff = NULL;
+
+    // read detailed ram usage
+    if(likely(mem->filename_detailed)) {
+        if(unlikely(mem->enabled_detailed == CONFIG_BOOLEAN_AUTO && mem->delay_counter_detailed > 0)) {
+            mem->delay_counter_detailed--;
+            goto memory_next;
+        }
+
+        ff = procfile_reopen(ff, mem->filename_detailed, NULL, CGROUP_PROCFILE_FLAG);
+        if(unlikely(!ff)) {
+            mem->updated_detailed = 0;
+            cgroups_check = 1;
+            goto memory_next;
+        }
+
+        ff = procfile_readall(ff);
+        if(unlikely(!ff)) {
+            mem->updated_detailed = 0;
+            cgroups_check = 1;
+            goto memory_next;
+        }
+
+        unsigned long i, lines = procfile_lines(ff);
+
+        if(unlikely(lines < 1)) {
+            collector_error("CGROUP: file '%s' should have 1+ lines.", mem->filename_detailed);
+            mem->updated_detailed = 0;
+            goto memory_next;
+        }
+
+
+        if(unlikely(!mem->arl_base)) {
+            if(parent_cg_is_unified == 0){
+                mem->arl_base = arl_create("cgroup/memory", NULL, 60);
+
+                arl_expect(mem->arl_base, "total_cache", &mem->total_cache);
+                arl_expect(mem->arl_base, "total_rss", &mem->total_rss);
+                arl_expect(mem->arl_base, "total_rss_huge", &mem->total_rss_huge);
+                arl_expect(mem->arl_base, "total_mapped_file", &mem->total_mapped_file);
+                arl_expect(mem->arl_base, "total_writeback", &mem->total_writeback);
+                mem->arl_dirty = arl_expect(mem->arl_base, "total_dirty", &mem->total_dirty);
+                mem->arl_swap  = arl_expect(mem->arl_base, "total_swap", &mem->total_swap);
+                arl_expect(mem->arl_base, "total_pgpgin", &mem->total_pgpgin);
+                arl_expect(mem->arl_base, "total_pgpgout", &mem->total_pgpgout);
+                arl_expect(mem->arl_base, "total_pgfault", &mem->total_pgfault);
+                arl_expect(mem->arl_base, "total_pgmajfault", &mem->total_pgmajfault);
+                arl_expect(mem->arl_base, "total_inactive_file", &mem->total_inactive_file);
+            } else {
+                mem->arl_base = arl_create("cgroup/memory", NULL, 60);
+
+                arl_expect(mem->arl_base, "anon", &mem->anon);
+                arl_expect(mem->arl_base, "kernel_stack", &mem->kernel_stack);
+                arl_expect(mem->arl_base, "slab", &mem->slab);
+                arl_expect(mem->arl_base, "sock", &mem->sock);
+                arl_expect(mem->arl_base, "anon_thp", &mem->anon_thp);
+                arl_expect(mem->arl_base, "file", &mem->total_mapped_file);
+                arl_expect(mem->arl_base, "file_writeback", &mem->total_writeback);
+                mem->arl_dirty = arl_expect(mem->arl_base, "file_dirty", &mem->total_dirty);
+                arl_expect(mem->arl_base, "pgfault", &mem->total_pgfault);
+                arl_expect(mem->arl_base, "pgmajfault", &mem->total_pgmajfault);
+                arl_expect(mem->arl_base, "inactive_file", &mem->total_inactive_file);
+            }
+        }
+
+        arl_begin(mem->arl_base);
+
+        for(i = 0; i < lines ; i++) {
+            if(arl_check(mem->arl_base,
+                    procfile_lineword(ff, i, 0),
+                    procfile_lineword(ff, i, 1))) break;
+        }
+
+        if(unlikely(mem->arl_dirty->flags & ARL_ENTRY_FLAG_FOUND))
+            mem->detailed_has_dirty = 1;
+
+        if(unlikely(parent_cg_is_unified == 0 && mem->arl_swap->flags & ARL_ENTRY_FLAG_FOUND))
+            mem->detailed_has_swap = 1;
+
+        // fprintf(stderr, "READ: '%s', cache: %llu, rss: %llu, rss_huge: %llu, mapped_file: %llu, writeback: %llu, dirty: %llu, swap: %llu, pgpgin: %llu, pgpgout: %llu, pgfault: %llu, pgmajfault: %llu, inactive_anon: %llu, active_anon: %llu, inactive_file: %llu, active_file: %llu, unevictable: %llu, hierarchical_memory_limit: %llu, total_cache: %llu, total_rss: %llu, total_rss_huge: %llu, total_mapped_file: %llu, total_writeback: %llu, total_dirty: %llu, total_swap: %llu, total_pgpgin: %llu, total_pgpgout: %llu, total_pgfault: %llu, total_pgmajfault: %llu, total_inactive_anon: %llu, total_active_anon: %llu, total_inactive_file: %llu, total_active_file: %llu, total_unevictable: %llu\n", mem->filename, mem->cache, mem->rss, mem->rss_huge, mem->mapped_file, mem->writeback, mem->dirty, mem->swap, mem->pgpgin, mem->pgpgout, mem->pgfault, mem->pgmajfault, mem->inactive_anon, mem->active_anon, mem->inactive_file, mem->active_file, mem->unevictable, mem->hierarchical_memory_limit, mem->total_cache, mem->total_rss, mem->total_rss_huge, mem->total_mapped_file, mem->total_writeback, mem->total_dirty, mem->total_swap, mem->total_pgpgin, mem->total_pgpgout, mem->total_pgfault, mem->total_pgmajfault, mem->total_inactive_anon, mem->total_active_anon, mem->total_inactive_file, mem->total_active_file, mem->total_unevictable);
+
+        mem->updated_detailed = 1;
+
+        if(unlikely(mem->enabled_detailed == CONFIG_BOOLEAN_AUTO)) {
+            if(( (!parent_cg_is_unified) && ( mem->total_cache || mem->total_dirty || mem->total_rss || mem->total_rss_huge || mem->total_mapped_file || mem->total_writeback
+                    || mem->total_swap || mem->total_pgpgin || mem->total_pgpgout || mem->total_pgfault || mem->total_pgmajfault || mem->total_inactive_file))
+               || (parent_cg_is_unified && ( mem->anon || mem->total_dirty || mem->kernel_stack || mem->slab || mem->sock || mem->total_writeback
+                    || mem->anon_thp || mem->total_pgfault || mem->total_pgmajfault || mem->total_inactive_file))
+               || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)
+                mem->enabled_detailed = CONFIG_BOOLEAN_YES;
+            else
+                mem->delay_counter_detailed = cgroup_recheck_zero_mem_detailed_every_iterations;
+        }
+    }
+
+memory_next:
+
+    // read usage_in_bytes
+    if(likely(mem->filename_usage_in_bytes)) {
+        mem->updated_usage_in_bytes = !read_single_number_file(mem->filename_usage_in_bytes, &mem->usage_in_bytes);
+        if(unlikely(mem->updated_usage_in_bytes && mem->enabled_usage_in_bytes == CONFIG_BOOLEAN_AUTO &&
+                    (mem->usage_in_bytes || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)))
+            mem->enabled_usage_in_bytes = CONFIG_BOOLEAN_YES;
+    }
+
+    if (likely(mem->updated_usage_in_bytes && mem->updated_detailed)) {
+        mem->usage_in_bytes =
+            (mem->usage_in_bytes > mem->total_inactive_file) ? (mem->usage_in_bytes - mem->total_inactive_file) : 0;
+    }
+
+    // read msw_usage_in_bytes
+    if(likely(mem->filename_msw_usage_in_bytes)) {
+        mem->updated_msw_usage_in_bytes = !read_single_number_file(mem->filename_msw_usage_in_bytes, &mem->msw_usage_in_bytes);
+        if(unlikely(mem->updated_msw_usage_in_bytes && mem->enabled_msw_usage_in_bytes == CONFIG_BOOLEAN_AUTO &&
+                    (mem->msw_usage_in_bytes || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES)))
+            mem->enabled_msw_usage_in_bytes = CONFIG_BOOLEAN_YES;
+    }
+
+    // read failcnt
+    if(likely(mem->filename_failcnt)) {
+        if(unlikely(mem->enabled_failcnt == CONFIG_BOOLEAN_AUTO && mem->delay_counter_failcnt > 0)) {
+            mem->updated_failcnt = 0;
+            mem->delay_counter_failcnt--;
+        }
+        else {
+            mem->updated_failcnt = !read_single_number_file(mem->filename_failcnt, &mem->failcnt);
+            if(unlikely(mem->updated_failcnt && mem->enabled_failcnt == CONFIG_BOOLEAN_AUTO)) {
+                if(unlikely(mem->failcnt || netdata_zero_metrics_enabled == CONFIG_BOOLEAN_YES))
+                    mem->enabled_failcnt = CONFIG_BOOLEAN_YES;
+                else
+                    mem->delay_counter_failcnt = cgroup_recheck_zero_mem_failcnt_every_iterations;
+            }
+        }
+    }
+}
+
+static void cgroup_read_pids_current(struct pids *pids) {
+    pids->pids_current_updated = 0;
+
+    if (unlikely(!pids->pids_current_filename))
+        return;
+
+    pids->pids_current_updated = !read_single_number_file(pids->pids_current_filename, &pids->pids_current);
+}
+
+static inline void read_cgroup(struct cgroup *cg) {
+    netdata_log_debug(D_CGROUP, "reading metrics for cgroups '%s'", cg->id);
+    if(!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) {
+        cgroup_read_cpuacct_stat(&cg->cpuacct_stat);
+        cgroup_read_cpuacct_usage(&cg->cpuacct_usage);
+        cgroup_read_cpuacct_cpu_stat(&cg->cpuacct_cpu_throttling);
+        cgroup_read_cpuacct_cpu_shares(&cg->cpuacct_cpu_shares);
+        cgroup_read_memory(&cg->memory, 0);
+        cgroup_read_blkio(&cg->io_service_bytes);
+        cgroup_read_blkio(&cg->io_serviced);
+        cgroup_read_blkio(&cg->throttle_io_service_bytes);
+        cgroup_read_blkio(&cg->throttle_io_serviced);
+        cgroup_read_blkio(&cg->io_merged);
+        cgroup_read_blkio(&cg->io_queued);
+        cgroup_read_pids_current(&cg->pids);
+    }
+    else {
+        //TODO: io_service_bytes and io_serviced use same file merge into 1 function
+        cgroup2_read_blkio(&cg->io_service_bytes, 0);
+        cgroup2_read_blkio(&cg->io_serviced, 4);
+        cgroup2_read_cpuacct_cpu_stat(&cg->cpuacct_stat, &cg->cpuacct_cpu_throttling);
+        cgroup_read_cpuacct_cpu_shares(&cg->cpuacct_cpu_shares);
+        cgroup2_read_pressure(&cg->cpu_pressure);
+        cgroup2_read_pressure(&cg->io_pressure);
+        cgroup2_read_pressure(&cg->memory_pressure);
+        cgroup2_read_pressure(&cg->irq_pressure);
+        cgroup_read_memory(&cg->memory, 1);
+        cgroup_read_pids_current(&cg->pids);
+    }
+}
+
+static inline void read_all_discovered_cgroups(struct cgroup *root) {
+    netdata_log_debug(D_CGROUP, "reading metrics for all cgroups");
+
+    struct cgroup *cg;
+    for (cg = root; cg; cg = cg->next) {
+        if (cg->enabled && !cg->pending_renames) {
+            read_cgroup(cg);
+        }
+    }
+}
+
+// update CPU and memory limits
+
+static inline void update_cpu_limits(char **filename, unsigned long long *value, struct cgroup *cg) {
+    if(*filename) {
+        int ret = -1;
+
+        if(value == &cg->cpuset_cpus) {
+            unsigned long ncpus = read_cpuset_cpus(*filename, get_system_cpus());
+            if(ncpus) {
+                *value = ncpus;
+                ret = 0;
+            }
+        }
+        else if(value == &cg->cpu_cfs_period || value == &cg->cpu_cfs_quota) {
+            ret = read_single_number_file(*filename, value);
+        }
+        else ret = -1;
+
+        if(ret) {
+            collector_error("Cannot refresh cgroup %s cpu limit by reading '%s'. Will not update its limit anymore.", cg->id, *filename);
+            freez(*filename);
+            *filename = NULL;
+        }
+    }
+}
+
+static inline void update_cpu_limits2(struct cgroup *cg) {
+    if(cg->filename_cpu_cfs_quota){
+        static procfile *ff = NULL;
+
+        ff = procfile_reopen(ff, cg->filename_cpu_cfs_quota, NULL, CGROUP_PROCFILE_FLAG);
+        if(unlikely(!ff)) {
+            goto cpu_limits2_err;
+        }
+
+        ff = procfile_readall(ff);
+        if(unlikely(!ff)) {
+            goto cpu_limits2_err;
+        }
+
+        unsigned long lines = procfile_lines(ff);
+
+        if (unlikely(lines < 1)) {
+            collector_error("CGROUP: file '%s' should have 1 lines.", cg->filename_cpu_cfs_quota);
+            return;
+        }
+
+        cg->cpu_cfs_period = str2ull(procfile_lineword(ff, 0, 1), NULL);
+        cg->cpuset_cpus = get_system_cpus();
+
+        char *s = "max\n\0";
+        if(strcmp(s, procfile_lineword(ff, 0, 0)) == 0){
+            cg->cpu_cfs_quota = cg->cpu_cfs_period * cg->cpuset_cpus;
+        } else {
+            cg->cpu_cfs_quota = str2ull(procfile_lineword(ff, 0, 0), NULL);
+        }
+        netdata_log_debug(D_CGROUP, "CPU limits values: %llu %llu %llu", cg->cpu_cfs_period, cg->cpuset_cpus, cg->cpu_cfs_quota);
+        return;
+
+cpu_limits2_err:
+        collector_error("Cannot refresh cgroup %s cpu limit by reading '%s'. Will not update its limit anymore.", cg->id, cg->filename_cpu_cfs_quota);
+        freez(cg->filename_cpu_cfs_quota);
+        cg->filename_cpu_cfs_quota = NULL;
+
+    }
+}
+
+static inline int update_memory_limits(struct cgroup *cg) {
+    char **filename = &cg->filename_memory_limit;
+    const RRDVAR_ACQUIRED **chart_var = &cg->chart_var_memory_limit;
+    unsigned long long *value = &cg->memory_limit;
+
+    if(*filename) {
+        if(unlikely(!*chart_var)) {
+            *chart_var = rrdvar_chart_variable_add_and_acquire(cg->st_mem_usage, "memory_limit");
+            if(!*chart_var) {
+                collector_error("Cannot create cgroup %s chart variable '%s'. Will not update its limit anymore.", cg->id, "memory_limit");
+                freez(*filename);
+                *filename = NULL;
+            }
+        }
+
+        if(*filename && *chart_var) {
+            if(!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) {
+                if(read_single_number_file(*filename, value)) {
+                    collector_error("Cannot refresh cgroup %s memory limit by reading '%s'. Will not update its limit anymore.", cg->id, *filename);
+                    freez(*filename);
+                    *filename = NULL;
+                }
+                else {
+                    rrdvar_chart_variable_set(
+                        cg->st_mem_usage, *chart_var, (NETDATA_DOUBLE)(*value) / (1024.0 * 1024.0));
+                    return 1;
+                }
+            } else {
+                char buffer[32];
+                int ret = read_txt_file(*filename, buffer, sizeof(buffer));
+                if(ret) {
+                    collector_error("Cannot refresh cgroup %s memory limit by reading '%s'. Will not update its limit anymore.", cg->id, *filename);
+                    freez(*filename);
+                    *filename = NULL;
+                    return 0;
+                }
+                char *s = "max\n\0";
+                if(strcmp(s, buffer) == 0){
+                    *value = UINT64_MAX;
+                    rrdvar_chart_variable_set(
+                        cg->st_mem_usage, *chart_var, (NETDATA_DOUBLE)(*value) / (1024.0 * 1024.0));
+                    return 1;
+                }
+                *value = str2ull(buffer, NULL);
+                rrdvar_chart_variable_set(cg->st_mem_usage, *chart_var, (NETDATA_DOUBLE)(*value) / (1024.0 * 1024.0));
+                return 1;
+            }
+        }
+    }
+    return 0;
+}
+
+// ----------------------------------------------------------------------------
+// generate charts
+
+void update_cgroup_systemd_services_charts() {
+    for (struct cgroup *cg = cgroup_root; cg; cg = cg->next) {
+        if (unlikely(!cg->enabled || cg->pending_renames || !is_cgroup_systemd_service(cg)))
+            continue;
+
+        if (likely(cg->cpuacct_stat.updated)) {
+            update_cpu_utilization_chart(cg);
+        }
+        if (likely(cg->memory.updated_msw_usage_in_bytes)) {
+            update_mem_usage_chart(cg);
+        }
+        if (likely(cg->memory.updated_failcnt)) {
+            update_mem_failcnt_chart(cg);
+        }
+        if (likely(cg->memory.updated_detailed)) {
+            update_mem_usage_detailed_chart(cg);
+            update_mem_writeback_chart(cg);
+            update_mem_pgfaults_chart(cg);
+            if (!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) {
+                update_mem_activity_chart(cg);
+            }
+        }
+        if (likely(cg->io_service_bytes.updated)) {
+            update_io_serviced_bytes_chart(cg);
+        }
+        if (likely(cg->io_serviced.updated)) {
+            update_io_serviced_ops_chart(cg);
+        }
+        if (likely(cg->throttle_io_service_bytes.updated)) {
+            update_throttle_io_serviced_bytes_chart(cg);
+        }
+        if (likely(cg->throttle_io_serviced.updated)) {
+            update_throttle_io_serviced_ops_chart(cg);
+        }
+        if (likely(cg->io_queued.updated)) {
+            update_io_queued_ops_chart(cg);
+        }
+        if (likely(cg->io_merged.updated)) {
+            update_io_merged_ops_chart(cg);
+        }
+
+        if (likely(cg->pids.pids_current_updated)) {
+            update_pids_current_chart(cg);
+        }
+
+        cg->function_ready = true;
+    }
+}
+
+void update_cgroup_charts() {
+    for (struct cgroup *cg = cgroup_root; cg; cg = cg->next) {
+        if(unlikely(!cg->enabled || cg->pending_renames || is_cgroup_systemd_service(cg)))
+            continue;
+
+        if (likely(cg->cpuacct_stat.updated && cg->cpuacct_stat.enabled == CONFIG_BOOLEAN_YES)) {
+            update_cpu_utilization_chart(cg);
+
+            if(likely(cg->filename_cpuset_cpus || cg->filename_cpu_cfs_period || cg->filename_cpu_cfs_quota)) {
+                if(!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) {
+                    update_cpu_limits(&cg->filename_cpuset_cpus, &cg->cpuset_cpus, cg);
+                    update_cpu_limits(&cg->filename_cpu_cfs_period, &cg->cpu_cfs_period, cg);
+                    update_cpu_limits(&cg->filename_cpu_cfs_quota, &cg->cpu_cfs_quota, cg);
+                } else {
+                    update_cpu_limits2(cg);
+                }
+
+                if(unlikely(!cg->chart_var_cpu_limit)) {
+                    cg->chart_var_cpu_limit = rrdvar_chart_variable_add_and_acquire(cg->st_cpu, "cpu_limit");
+                    if(!cg->chart_var_cpu_limit) {
+                        collector_error("Cannot create cgroup %s chart variable 'cpu_limit'. Will not update its limit anymore.", cg->id);
+                        if(cg->filename_cpuset_cpus) freez(cg->filename_cpuset_cpus);
+                        cg->filename_cpuset_cpus = NULL;
+                        if(cg->filename_cpu_cfs_period) freez(cg->filename_cpu_cfs_period);
+                        cg->filename_cpu_cfs_period = NULL;
+                        if(cg->filename_cpu_cfs_quota) freez(cg->filename_cpu_cfs_quota);
+                        cg->filename_cpu_cfs_quota = NULL;
+                    }
+                } else {
+                    NETDATA_DOUBLE value = 0, quota = 0;
+
+                    if(likely( ((!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) && (cg->filename_cpuset_cpus || (cg->filename_cpu_cfs_period && cg->filename_cpu_cfs_quota)))
+                            || ((cg->options & CGROUP_OPTIONS_IS_UNIFIED) && cg->filename_cpu_cfs_quota))) {
+                        if(unlikely(cg->cpu_cfs_quota > 0))
+                            quota = (NETDATA_DOUBLE)cg->cpu_cfs_quota / (NETDATA_DOUBLE)cg->cpu_cfs_period;
+
+                        if(unlikely(quota > 0 && quota < cg->cpuset_cpus))
+                            value = quota * 100;
+                        else
+                            value = (NETDATA_DOUBLE)cg->cpuset_cpus * 100;
+                    }
+                    if(likely(value)) {
+                        update_cpu_utilization_limit_chart(cg, value);
+                    } else {
+                        if (unlikely(cg->st_cpu_limit)) {
+                            rrdset_is_obsolete___safe_from_collector_thread(cg->st_cpu_limit);
+                            cg->st_cpu_limit = NULL;
+                        }
+                        rrdvar_chart_variable_set(cg->st_cpu, cg->chart_var_cpu_limit, NAN);
+                    }
+                }
+            }
+        }
+
+        if (likely(cg->cpuacct_cpu_throttling.updated && cg->cpuacct_cpu_throttling.enabled == CONFIG_BOOLEAN_YES)) {
+            update_cpu_throttled_chart(cg);
+            update_cpu_throttled_duration_chart(cg);
+        }
+
+        if (likely(cg->cpuacct_cpu_shares.updated && cg->cpuacct_cpu_shares.enabled == CONFIG_BOOLEAN_YES)) {
+            update_cpu_shares_chart(cg);
+        }
+
+        if (likely(cg->cpuacct_usage.updated && cg->cpuacct_usage.enabled == CONFIG_BOOLEAN_YES)) {
+            update_cpu_per_core_usage_chart(cg);
+        }
+
+        if (likely(cg->memory.updated_detailed && cg->memory.enabled_detailed == CONFIG_BOOLEAN_YES)) {
+            update_mem_usage_detailed_chart(cg);
+            update_mem_writeback_chart(cg);
+
+            if(!(cg->options & CGROUP_OPTIONS_IS_UNIFIED)) {
+                update_mem_activity_chart(cg);
+            }
+
+            update_mem_pgfaults_chart(cg);
+        }
+
+        if (likely(cg->memory.updated_usage_in_bytes && cg->memory.enabled_usage_in_bytes == CONFIG_BOOLEAN_YES)) {
+            update_mem_usage_chart(cg);
+
+            // FIXME: this if should be only for unlimited charts
+            if(likely(host_ram_total)) {
+                // FIXME: do we need to update mem limits on every data collection?
+                if (likely(update_memory_limits(cg))) {
+
+                    unsigned long long memory_limit = host_ram_total;
+                    if (unlikely(cg->memory_limit < host_ram_total))
+                        memory_limit = cg->memory_limit;
+
+                    update_mem_usage_limit_chart(cg, memory_limit);
+                    update_mem_utilization_chart(cg, memory_limit);
+                } else {
+                    if (unlikely(cg->st_mem_usage_limit)) {
+                        rrdset_is_obsolete___safe_from_collector_thread(cg->st_mem_usage_limit);
+                        cg->st_mem_usage_limit = NULL;
+                    }
+
+                    if (unlikely(cg->st_mem_utilization)) {
+                        rrdset_is_obsolete___safe_from_collector_thread(cg->st_mem_utilization);
+                        cg->st_mem_utilization = NULL;
+                    }
+                }
+            }
+        }
+
+        if (likely(cg->memory.updated_failcnt && cg->memory.enabled_failcnt == CONFIG_BOOLEAN_YES)) {
+            update_mem_failcnt_chart(cg);
+        }
+
+        if (likely(cg->io_service_bytes.updated && cg->io_service_bytes.enabled == CONFIG_BOOLEAN_YES)) {
+            update_io_serviced_bytes_chart(cg);
+        }
+
+        if (likely(cg->io_serviced.updated && cg->io_serviced.enabled == CONFIG_BOOLEAN_YES)) {
+            update_io_serviced_ops_chart(cg);
+        }
+
+        if (likely(cg->throttle_io_service_bytes.updated && cg->throttle_io_service_bytes.enabled == CONFIG_BOOLEAN_YES)) {
+                update_throttle_io_serviced_bytes_chart(cg);
+        }
+
+        if (likely(cg->throttle_io_serviced.updated && cg->throttle_io_serviced.enabled == CONFIG_BOOLEAN_YES)) {
+                update_throttle_io_serviced_ops_chart(cg);
+        }
+
+        if (likely(cg->io_queued.updated && cg->io_queued.enabled == CONFIG_BOOLEAN_YES)) {
+                update_io_queued_ops_chart(cg);
+        }
+
+        if (likely(cg->io_merged.updated && cg->io_merged.enabled == CONFIG_BOOLEAN_YES)) {
+                update_io_merged_ops_chart(cg);
+        }
+
+        if (likely(cg->pids.pids_current_updated)) {
+                update_pids_current_chart(cg);
+        }
+
+        if (cg->options & CGROUP_OPTIONS_IS_UNIFIED) {
+            if (likely(cg->cpu_pressure.updated)) {
+                    if (cg->cpu_pressure.some.enabled) {
+                        update_cpu_some_pressure_chart(cg);
+                        update_cpu_some_pressure_stall_time_chart(cg);
+                    }
+                    if (cg->cpu_pressure.full.enabled) {
+                        update_cpu_full_pressure_chart(cg);
+                        update_cpu_full_pressure_stall_time_chart(cg);
+                    }
+            }
+
+            if (likely(cg->memory_pressure.updated)) {
+                if (cg->memory_pressure.some.enabled) {
+                        update_mem_some_pressure_chart(cg);
+                        update_mem_some_pressure_stall_time_chart(cg);
+                }
+                if (cg->memory_pressure.full.enabled) {
+                        update_mem_full_pressure_chart(cg);
+                        update_mem_full_pressure_stall_time_chart(cg);
+                }
+            }
+
+            if (likely(cg->irq_pressure.updated)) {
+                if (cg->irq_pressure.some.enabled) {
+                        update_irq_some_pressure_chart(cg);
+                        update_irq_some_pressure_stall_time_chart(cg);
+                }
+                if (cg->irq_pressure.full.enabled) {
+                        update_irq_full_pressure_chart(cg);
+                        update_irq_full_pressure_stall_time_chart(cg);
+                }
+            }
+
+            if (likely(cg->io_pressure.updated)) {
+                if (cg->io_pressure.some.enabled) {
+                        update_io_some_pressure_chart(cg);
+                        update_io_some_pressure_stall_time_chart(cg);
+                }
+                if (cg->io_pressure.full.enabled) {
+                        update_io_full_pressure_chart(cg);
+                        update_io_full_pressure_stall_time_chart(cg);
+                }
+            }
+        }
+
+        cg->function_ready = true;
+    }
+}
+
+// ----------------------------------------------------------------------------
+// cgroups main
+
+static void cgroup_main_cleanup(void *ptr) {
+    worker_unregister();
+
+    struct netdata_static_thread *static_thread = (struct netdata_static_thread *)ptr;
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITING;
+
+    collector_info("cleaning up...");
+
+    usec_t max = 2 * USEC_PER_SEC, step = 50000;
+
+    if (!__atomic_load_n(&discovery_thread.exited, __ATOMIC_RELAXED)) {
+        collector_info("waiting for discovery thread to finish...");
+        while (!__atomic_load_n(&discovery_thread.exited, __ATOMIC_RELAXED) && max > 0) {
+            uv_mutex_lock(&discovery_thread.mutex);
+            uv_cond_signal(&discovery_thread.cond_var);
+            uv_mutex_unlock(&discovery_thread.mutex);
+            max -= step;
+            sleep_usec(step);
+        }
+    }
+
+    static_thread->enabled = NETDATA_MAIN_THREAD_EXITED;
+}
+
+void cgroup_read_host_total_ram() {
+    procfile *ff = NULL;
+    char filename[FILENAME_MAX + 1];
+    snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/meminfo");
+
+    ff = procfile_open(
+        config_get("plugin:cgroups", "meminfo filename to monitor", filename), " \t:", PROCFILE_FLAG_DEFAULT);
+
+    if (likely((ff = procfile_readall(ff)) && procfile_lines(ff) && !strncmp(procfile_word(ff, 0), "MemTotal", 8)))
+        host_ram_total = str2ull(procfile_word(ff, 1), NULL) * 1024;
+    else
+        collector_error("Cannot read file %s. Will not create RAM limit charts.", filename);
+
+    procfile_close(ff);
+}
+
+void *cgroups_main(void *ptr) {
+    worker_register("CGROUPS");
+    worker_register_job_name(WORKER_CGROUPS_LOCK, "lock");
+    worker_register_job_name(WORKER_CGROUPS_READ, "read");
+    worker_register_job_name(WORKER_CGROUPS_CHART, "chart");
+
+    netdata_thread_cleanup_push(cgroup_main_cleanup, ptr);
+
+    if (getenv("KUBERNETES_SERVICE_HOST") != NULL && getenv("KUBERNETES_SERVICE_PORT") != NULL) {
+        is_inside_k8s = 1;
+        cgroup_enable_cpuacct_cpu_shares = CONFIG_BOOLEAN_YES;
+    }
+
+    read_cgroup_plugin_configuration();
+
+    cgroup_read_host_total_ram();
+
+    if (uv_mutex_init(&cgroup_root_mutex)) {
+        collector_error("CGROUP: cannot initialize mutex for the main cgroup list");
+        goto exit;
+    }
+
+    discovery_thread.exited = 0;
+
+    if (uv_mutex_init(&discovery_thread.mutex)) {
+        collector_error("CGROUP: cannot initialize mutex for discovery thread");
+        goto exit;
+    }
+    if (uv_cond_init(&discovery_thread.cond_var)) {
+        collector_error("CGROUP: cannot initialize conditional variable for discovery thread");
+        goto exit;
+    }
+
+    int error = uv_thread_create(&discovery_thread.thread, cgroup_discovery_worker, NULL);
+    if (error) {
+        collector_error("CGROUP: cannot create thread worker. uv_thread_create(): %s", uv_strerror(error));
+        goto exit;
+    }
+
+    uv_thread_set_name_np(discovery_thread.thread, "P[cgroups]");
+
+    // we register this only on localhost
+    // for the other nodes, the origin server should register it
+    cgroup_netdev_link_init();
+
+    rrd_function_add_inline(localhost, NULL, "containers-vms", 10,
+                            RRDFUNCTIONS_PRIORITY_DEFAULT / 2, RRDFUNCTIONS_CGTOP_HELP,
+                            "top", HTTP_ACCESS_ANONYMOUS_DATA,
+                            cgroup_function_cgroup_top);
+
+    rrd_function_add_inline(localhost, NULL, "systemd-services", 10,
+                            RRDFUNCTIONS_PRIORITY_DEFAULT / 3, RRDFUNCTIONS_SYSTEMD_SERVICES_HELP,
+                            "top", HTTP_ACCESS_ANONYMOUS_DATA,
+                            cgroup_function_systemd_top);
+
+    heartbeat_t hb;
+    heartbeat_init(&hb);
+    usec_t step = cgroup_update_every * USEC_PER_SEC;
+    usec_t find_every = cgroup_check_for_new_every * USEC_PER_SEC, find_dt = 0;
+
+    netdata_thread_disable_cancelability();
+
+    while(service_running(SERVICE_COLLECTORS)) {
+        worker_is_idle();
+
+        usec_t hb_dt = heartbeat_next(&hb, step);
+        if (unlikely(!service_running(SERVICE_COLLECTORS)))
+            break;
+
+        find_dt += hb_dt;
+        if (unlikely(find_dt >= find_every || (!is_inside_k8s && cgroups_check))) {
+            uv_mutex_lock(&discovery_thread.mutex);
+            uv_cond_signal(&discovery_thread.cond_var);
+            uv_mutex_unlock(&discovery_thread.mutex);
+            find_dt = 0;
+            cgroups_check = 0;
+        }
+
+        worker_is_busy(WORKER_CGROUPS_LOCK);
+        uv_mutex_lock(&cgroup_root_mutex);
+
+        worker_is_busy(WORKER_CGROUPS_READ);
+        read_all_discovered_cgroups(cgroup_root);
+
+        if (unlikely(!service_running(SERVICE_COLLECTORS))) {
+            uv_mutex_unlock(&cgroup_root_mutex);
+            break;
+        }
+
+        worker_is_busy(WORKER_CGROUPS_CHART);
+
+        update_cgroup_charts();
+        if (cgroup_enable_systemd_services)
+            update_cgroup_systemd_services_charts();
+
+        if (unlikely(!service_running(SERVICE_COLLECTORS))) {
+           uv_mutex_unlock(&cgroup_root_mutex);
+           break;
+        }
+
+        worker_is_idle();
+        uv_mutex_unlock(&cgroup_root_mutex);
+    }
+
+exit:
+    netdata_thread_cleanup_pop(1);
+    return NULL;
+}