New upstream version 1.11.0+dfsgupstream/1.11.0+dfsg

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

1 files changed, 3799 insertions, 0 deletions

diff --git a/collectors/apps.plugin/apps_plugin.c b/collectors/apps.plugin/apps_plugin.c
new file mode 100644
index 000000000..f592e9fc8
--- /dev/null
+++ b/collectors/apps.plugin/apps_plugin.c
@@ -0,0 +1,3799 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+/*
+ * netdata apps.plugin
+ * (C) Copyright 2016-2017 Costa Tsaousis <costa@tsaousis.gr>
+ * Released under GPL v3+
+ */
+
+#include "../../libnetdata/libnetdata.h"
+
+// ----------------------------------------------------------------------------
+
+// callback required by fatal()
+void netdata_cleanup_and_exit(int ret) {
+    exit(ret);
+}
+
+// callbacks required by popen()
+void signals_block(void) {};
+void signals_unblock(void) {};
+void signals_reset(void) {};
+
+// callback required by eval()
+int health_variable_lookup(const char *variable, uint32_t hash, struct rrdcalc *rc, calculated_number *result) {
+    (void)variable;
+    (void)hash;
+    (void)rc;
+    (void)result;
+    return 0;
+};
+
+// required by get_system_cpus()
+char *netdata_configured_host_prefix = "";
+
+
+// ----------------------------------------------------------------------------
+// debugging
+
+static int debug_enabled = 0;
+static inline void debug_log_int(const char *fmt, ... ) {
+    va_list args;
+
+    fprintf( stderr, "apps.plugin: ");
+    va_start( args, fmt );
+    vfprintf( stderr, fmt, args );
+    va_end( args );
+
+    fputc('\n', stderr);
+}
+
+#ifdef NETDATA_INTERNAL_CHECKS
+
+#define debug_log(fmt, args...) do { if(unlikely(debug_enabled)) debug_log_int(fmt, ##args); } while(0)
+
+#else
+
+static inline void debug_log_dummy(void) {}
+#define debug_log(fmt, args...) debug_log_dummy()
+
+#endif
+
+
+// ----------------------------------------------------------------------------
+
+#ifdef __FreeBSD__
+#include <sys/user.h>
+#endif
+
+// ----------------------------------------------------------------------------
+// per O/S configuration
+
+// the minimum PID of the system
+// this is also the pid of the init process
+#define INIT_PID 1
+
+// if the way apps.plugin will work, will read the entire process list,
+// including the resource utilization of each process, instantly
+// set this to 1
+// when set to 0, apps.plugin builds a sort list of processes, in order
+// to process children processes, before parent processes
+#ifdef __FreeBSD__
+#define ALL_PIDS_ARE_READ_INSTANTLY 1
+#else
+#define ALL_PIDS_ARE_READ_INSTANTLY 0
+#endif
+
+// ----------------------------------------------------------------------------
+// string lengths
+
+#define MAX_COMPARE_NAME 100
+#define MAX_NAME 100
+#define MAX_CMDLINE 16384
+
+// ----------------------------------------------------------------------------
+// the rates we are going to send to netdata will have this detail a value of:
+//  - 1 will send just integer parts to netdata
+//  - 100 will send 2 decimal points
+//  - 1000 will send 3 decimal points
+// etc.
+#define RATES_DETAIL 10000ULL
+
+
+// ----------------------------------------------------------------------------
+// to avoid reallocating too frequently, we can increase the number of spare
+// file descriptors used by processes.
+// IMPORTANT:
+// having a lot of spares, increases the CPU utilization of the plugin.
+#define MAX_SPARE_FDS 1
+
+
+// ----------------------------------------------------------------------------
+// command line options
+
+static int
+        update_every = 1,
+        enable_guest_charts = 0,
+#ifdef __FreeBSD__
+        enable_file_charts = 0,
+#else
+        enable_file_charts = 1,
+        max_fds_cache_seconds = 60,
+#endif
+        enable_users_charts = 1,
+        enable_groups_charts = 1,
+        include_exited_childs = 1;
+
+// will be changed to getenv(NETDATA_USER_CONFIG_DIR) if it exists
+static char *user_config_dir = CONFIG_DIR;
+static char *stock_config_dir = LIBCONFIG_DIR;
+
+// ----------------------------------------------------------------------------
+// internal flags
+// handled in code (automatically set)
+
+static int
+        show_guest_time = 0,            // 1 when guest values are collected
+        show_guest_time_old = 0,
+        proc_pid_cmdline_is_needed = 0; // 1 when we need to read /proc/cmdline
+
+
+// ----------------------------------------------------------------------------
+// internal counters
+
+static size_t
+        global_iterations_counter = 1,
+        calls_counter = 0,
+        file_counter = 0,
+        filenames_allocated_counter = 0,
+        inodes_changed_counter = 0,
+        links_changed_counter = 0,
+        targets_assignment_counter = 0;
+
+
+// ----------------------------------------------------------------------------
+// Normalization
+//
+// With normalization we lower the collected metrics by a factor to make them
+// match the total utilization of the system.
+// The discrepancy exists because apps.plugin needs some time to collect all
+// the metrics. This results in utilization that exceeds the total utilization
+// of the system.
+//
+// With normalization we align the per-process utilization, to the total of
+// the system. We first consume the exited children utilization and it the
+// collected values is above the total, we proportionally scale each reported
+// metric.
+
+// the total system time, as reported by /proc/stat
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+static kernel_uint_t
+        global_utime = 0,
+        global_stime = 0,
+        global_gtime = 0;
+#endif
+
+// the normalization ratios, as calculated by normalize_utilization()
+double  utime_fix_ratio = 1.0,
+        stime_fix_ratio = 1.0,
+        gtime_fix_ratio = 1.0,
+        minflt_fix_ratio = 1.0,
+        majflt_fix_ratio = 1.0,
+        cutime_fix_ratio = 1.0,
+        cstime_fix_ratio = 1.0,
+        cgtime_fix_ratio = 1.0,
+        cminflt_fix_ratio = 1.0,
+        cmajflt_fix_ratio = 1.0;
+
+// ----------------------------------------------------------------------------
+// target
+//
+// target is the structure that processes are aggregated to be reported
+// to netdata.
+//
+// - Each entry in /etc/apps_groups.conf creates a target.
+// - Each user and group used by a process in the system, creates a target.
+
+struct target {
+    char compare[MAX_COMPARE_NAME + 1];
+    uint32_t comparehash;
+    size_t comparelen;
+
+    char id[MAX_NAME + 1];
+    uint32_t idhash;
+
+    char name[MAX_NAME + 1];
+
+    uid_t uid;
+    gid_t gid;
+
+    kernel_uint_t minflt;
+    kernel_uint_t cminflt;
+    kernel_uint_t majflt;
+    kernel_uint_t cmajflt;
+    kernel_uint_t utime;
+    kernel_uint_t stime;
+    kernel_uint_t gtime;
+    kernel_uint_t cutime;
+    kernel_uint_t cstime;
+    kernel_uint_t cgtime;
+    kernel_uint_t num_threads;
+    // kernel_uint_t rss;
+
+    kernel_uint_t status_vmsize;
+    kernel_uint_t status_vmrss;
+    kernel_uint_t status_vmshared;
+    kernel_uint_t status_rssfile;
+    kernel_uint_t status_rssshmem;
+    kernel_uint_t status_vmswap;
+
+    kernel_uint_t io_logical_bytes_read;
+    kernel_uint_t io_logical_bytes_written;
+    // kernel_uint_t io_read_calls;
+    // kernel_uint_t io_write_calls;
+    kernel_uint_t io_storage_bytes_read;
+    kernel_uint_t io_storage_bytes_written;
+    // kernel_uint_t io_cancelled_write_bytes;
+
+    int *target_fds;
+    int target_fds_size;
+
+    kernel_uint_t openfiles;
+    kernel_uint_t openpipes;
+    kernel_uint_t opensockets;
+    kernel_uint_t openinotifies;
+    kernel_uint_t openeventfds;
+    kernel_uint_t opentimerfds;
+    kernel_uint_t opensignalfds;
+    kernel_uint_t openeventpolls;
+    kernel_uint_t openother;
+
+    unsigned int processes; // how many processes have been merged to this
+    int exposed;            // if set, we have sent this to netdata
+    int hidden;             // if set, we set the hidden flag on the dimension
+    int debug_enabled;
+    int ends_with;
+    int starts_with;        // if set, the compare string matches only the
+                            // beginning of the command
+
+    struct target *target;  // the one that will be reported to netdata
+    struct target *next;
+};
+
+struct target
+        *apps_groups_default_target = NULL, // the default target
+        *apps_groups_root_target = NULL,    // apps_groups.conf defined
+        *users_root_target = NULL,          // users
+        *groups_root_target = NULL;         // user groups
+
+size_t
+        apps_groups_targets_count = 0;       // # of apps_groups.conf targets
+
+
+// ----------------------------------------------------------------------------
+// pid_stat
+//
+// structure to store data for each process running
+// see: man proc for the description of the fields
+
+struct pid_fd {
+    int fd;
+
+#ifndef __FreeBSD__
+    ino_t inode;
+    char *filename;
+    uint32_t link_hash;
+    size_t cache_iterations_counter;
+    size_t cache_iterations_reset;
+#endif
+};
+
+struct pid_stat {
+    int32_t pid;
+    char comm[MAX_COMPARE_NAME + 1];
+    char *cmdline;
+
+    uint32_t log_thrown;
+
+    // char state;
+    int32_t ppid;
+    // int32_t pgrp;
+    // int32_t session;
+    // int32_t tty_nr;
+    // int32_t tpgid;
+    // uint64_t flags;
+
+    // these are raw values collected
+    kernel_uint_t minflt_raw;
+    kernel_uint_t cminflt_raw;
+    kernel_uint_t majflt_raw;
+    kernel_uint_t cmajflt_raw;
+    kernel_uint_t utime_raw;
+    kernel_uint_t stime_raw;
+    kernel_uint_t gtime_raw; // guest_time
+    kernel_uint_t cutime_raw;
+    kernel_uint_t cstime_raw;
+    kernel_uint_t cgtime_raw; // cguest_time
+
+    // these are rates
+    kernel_uint_t minflt;
+    kernel_uint_t cminflt;
+    kernel_uint_t majflt;
+    kernel_uint_t cmajflt;
+    kernel_uint_t utime;
+    kernel_uint_t stime;
+    kernel_uint_t gtime;
+    kernel_uint_t cutime;
+    kernel_uint_t cstime;
+    kernel_uint_t cgtime;
+
+    // int64_t priority;
+    // int64_t nice;
+    int32_t num_threads;
+    // int64_t itrealvalue;
+    // kernel_uint_t starttime;
+    // kernel_uint_t vsize;
+    // kernel_uint_t rss;
+    // kernel_uint_t rsslim;
+    // kernel_uint_t starcode;
+    // kernel_uint_t endcode;
+    // kernel_uint_t startstack;
+    // kernel_uint_t kstkesp;
+    // kernel_uint_t kstkeip;
+    // uint64_t signal;
+    // uint64_t blocked;
+    // uint64_t sigignore;
+    // uint64_t sigcatch;
+    // uint64_t wchan;
+    // uint64_t nswap;
+    // uint64_t cnswap;
+    // int32_t exit_signal;
+    // int32_t processor;
+    // uint32_t rt_priority;
+    // uint32_t policy;
+    // kernel_uint_t delayacct_blkio_ticks;
+
+    uid_t uid;
+    gid_t gid;
+
+    kernel_uint_t status_vmsize;
+    kernel_uint_t status_vmrss;
+    kernel_uint_t status_vmshared;
+    kernel_uint_t status_rssfile;
+    kernel_uint_t status_rssshmem;
+    kernel_uint_t status_vmswap;
+#ifndef __FreeBSD__
+    ARL_BASE *status_arl;
+#endif
+
+    kernel_uint_t io_logical_bytes_read_raw;
+    kernel_uint_t io_logical_bytes_written_raw;
+    // kernel_uint_t io_read_calls_raw;
+    // kernel_uint_t io_write_calls_raw;
+    kernel_uint_t io_storage_bytes_read_raw;
+    kernel_uint_t io_storage_bytes_written_raw;
+    // kernel_uint_t io_cancelled_write_bytes_raw;
+
+    kernel_uint_t io_logical_bytes_read;
+    kernel_uint_t io_logical_bytes_written;
+    // kernel_uint_t io_read_calls;
+    // kernel_uint_t io_write_calls;
+    kernel_uint_t io_storage_bytes_read;
+    kernel_uint_t io_storage_bytes_written;
+    // kernel_uint_t io_cancelled_write_bytes;
+
+    struct pid_fd *fds;             // array of fds it uses
+    size_t fds_size;                   // the size of the fds array
+
+    int children_count;             // number of processes directly referencing this
+    unsigned char keep:1;           // 1 when we need to keep this process in memory even after it exited
+    int keeploops;                  // increases by 1 every time keep is 1 and updated 0
+    unsigned char updated:1;        // 1 when the process is currently running
+    unsigned char merged:1;         // 1 when it has been merged to its parent
+    unsigned char read:1;           // 1 when we have already read this process for this iteration
+
+    int sortlist;                   // higher numbers = top on the process tree
+                                    // each process gets a unique number
+
+    struct target *target;          // app_groups.conf targets
+    struct target *user_target;     // uid based targets
+    struct target *group_target;    // gid based targets
+
+    usec_t stat_collected_usec;
+    usec_t last_stat_collected_usec;
+
+    usec_t io_collected_usec;
+    usec_t last_io_collected_usec;
+
+    char *fds_dirname;              // the full directory name in /proc/PID/fd
+
+    char *stat_filename;
+    char *status_filename;
+    char *io_filename;
+    char *cmdline_filename;
+
+    struct pid_stat *parent;
+    struct pid_stat *prev;
+    struct pid_stat *next;
+};
+
+size_t pagesize;
+
+// log each problem once per process
+// log flood protection flags (log_thrown)
+#define PID_LOG_IO      0x00000001
+#define PID_LOG_STATUS  0x00000002
+#define PID_LOG_CMDLINE 0x00000004
+#define PID_LOG_FDS     0x00000008
+#define PID_LOG_STAT    0x00000010
+
+static struct pid_stat
+        *root_of_pids = NULL,   // global list of all processes running
+        **all_pids = NULL;      // to avoid allocations, we pre-allocate the
+                                // the entire pid space.
+
+static size_t
+        all_pids_count = 0;     // the number of processes running
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+// Another pre-allocated list of all possible pids.
+// We need it to pids and assign them a unique sortlist id, so that we
+// read parents before children. This is needed to prevent a situation where
+// a child is found running, but until we read its parent, it has exited and
+// its parent has accumulated its resources.
+static pid_t
+        *all_pids_sortlist = NULL;
+#endif
+
+// ----------------------------------------------------------------------------
+// file descriptor
+//
+// this is used to keep a global list of all open files of the system.
+// it is needed in order to calculate the unique files processes have open.
+
+#define FILE_DESCRIPTORS_INCREASE_STEP 100
+
+// types for struct file_descriptor->type
+typedef enum fd_filetype {
+    FILETYPE_OTHER,
+    FILETYPE_FILE,
+    FILETYPE_PIPE,
+    FILETYPE_SOCKET,
+    FILETYPE_INOTIFY,
+    FILETYPE_EVENTFD,
+    FILETYPE_EVENTPOLL,
+    FILETYPE_TIMERFD,
+    FILETYPE_SIGNALFD
+} FD_FILETYPE;
+
+struct file_descriptor {
+    avl avl;
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    uint32_t magic;
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+    const char *name;
+    uint32_t hash;
+
+    FD_FILETYPE type;
+    int count;
+    int pos;
+} *all_files = NULL;
+
+static int
+        all_files_len = 0,
+        all_files_size = 0;
+
+// ----------------------------------------------------------------------------
+// apps_groups.conf
+// aggregate all processes in groups, to have a limited number of dimensions
+
+static struct target *get_users_target(uid_t uid) {
+    struct target *w;
+    for(w = users_root_target ; w ; w = w->next)
+        if(w->uid == uid) return w;
+
+    w = callocz(sizeof(struct target), 1);
+    snprintfz(w->compare, MAX_COMPARE_NAME, "%u", uid);
+    w->comparehash = simple_hash(w->compare);
+    w->comparelen = strlen(w->compare);
+
+    snprintfz(w->id, MAX_NAME, "%u", uid);
+    w->idhash = simple_hash(w->id);
+
+    struct passwd *pw = getpwuid(uid);
+    if(!pw || !pw->pw_name || !*pw->pw_name)
+        snprintfz(w->name, MAX_NAME, "%u", uid);
+    else
+        snprintfz(w->name, MAX_NAME, "%s", pw->pw_name);
+
+    netdata_fix_chart_name(w->name);
+
+    w->uid = uid;
+
+    w->next = users_root_target;
+    users_root_target = w;
+
+    debug_log("added uid %u ('%s') target", w->uid, w->name);
+
+    return w;
+}
+
+struct target *get_groups_target(gid_t gid)
+{
+    struct target *w;
+    for(w = groups_root_target ; w ; w = w->next)
+        if(w->gid == gid) return w;
+
+    w = callocz(sizeof(struct target), 1);
+    snprintfz(w->compare, MAX_COMPARE_NAME, "%u", gid);
+    w->comparehash = simple_hash(w->compare);
+    w->comparelen = strlen(w->compare);
+
+    snprintfz(w->id, MAX_NAME, "%u", gid);
+    w->idhash = simple_hash(w->id);
+
+    struct group *gr = getgrgid(gid);
+    if(!gr || !gr->gr_name || !*gr->gr_name)
+        snprintfz(w->name, MAX_NAME, "%u", gid);
+    else
+        snprintfz(w->name, MAX_NAME, "%s", gr->gr_name);
+
+    netdata_fix_chart_name(w->name);
+
+    w->gid = gid;
+
+    w->next = groups_root_target;
+    groups_root_target = w;
+
+    debug_log("added gid %u ('%s') target", w->gid, w->name);
+
+    return w;
+}
+
+// find or create a new target
+// there are targets that are just aggregated to other target (the second argument)
+static struct target *get_apps_groups_target(const char *id, struct target *target, const char *name) {
+    int tdebug = 0, thidden = target?target->hidden:0, ends_with = 0;
+    const char *nid = id;
+
+    // extract the options
+    while(nid[0] == '-' || nid[0] == '+' || nid[0] == '*') {
+        if(nid[0] == '-') thidden = 1;
+        if(nid[0] == '+') tdebug = 1;
+        if(nid[0] == '*') ends_with = 1;
+        nid++;
+    }
+    uint32_t hash = simple_hash(id);
+
+    // find if it already exists
+    struct target *w, *last = apps_groups_root_target;
+    for(w = apps_groups_root_target ; w ; w = w->next) {
+        if(w->idhash == hash && strncmp(nid, w->id, MAX_NAME) == 0)
+            return w;
+
+        last = w;
+    }
+
+    // find an existing target
+    if(unlikely(!target)) {
+        while(*name == '-') {
+            if(*name == '-') thidden = 1;
+            name++;
+        }
+
+        for(target = apps_groups_root_target ; target != NULL ; target = target->next) {
+            if(!target->target && strcmp(name, target->name) == 0)
+                break;
+        }
+
+        if(unlikely(debug_enabled)) {
+            if(unlikely(target))
+                debug_log("REUSING TARGET NAME '%s' on ID '%s'", target->name, target->id);
+            else
+                debug_log("NEW TARGET NAME '%s' on ID '%s'", name, id);
+        }
+    }
+
+    if(target && target->target)
+        fatal("Internal Error: request to link process '%s' to target '%s' which is linked to target '%s'", id, target->id, target->target->id);
+
+    w = callocz(sizeof(struct target), 1);
+    strncpyz(w->id, nid, MAX_NAME);
+    w->idhash = simple_hash(w->id);
+
+    if(unlikely(!target))
+        // copy the name
+        strncpyz(w->name, name, MAX_NAME);
+    else
+        // copy the id
+        strncpyz(w->name, nid, MAX_NAME);
+
+    strncpyz(w->compare, nid, MAX_COMPARE_NAME);
+    size_t len = strlen(w->compare);
+    if(w->compare[len - 1] == '*') {
+        w->compare[len - 1] = '\0';
+        w->starts_with = 1;
+    }
+    w->ends_with = ends_with;
+
+    if(w->starts_with && w->ends_with)
+        proc_pid_cmdline_is_needed = 1;
+
+    w->comparehash = simple_hash(w->compare);
+    w->comparelen = strlen(w->compare);
+
+    w->hidden = thidden;
+#ifdef NETDATA_INTERNAL_CHECKS
+    w->debug_enabled = tdebug;
+#else
+    if(tdebug)
+        fprintf(stderr, "apps.plugin has been compiled without debugging\n");
+#endif
+    w->target = target;
+
+    // append it, to maintain the order in apps_groups.conf
+    if(last) last->next = w;
+    else apps_groups_root_target = w;
+
+    debug_log("ADDING TARGET ID '%s', process name '%s' (%s), aggregated on target '%s', options: %s %s"
+            , w->id
+            , w->compare, (w->starts_with && w->ends_with)?"substring":((w->starts_with)?"prefix":((w->ends_with)?"suffix":"exact"))
+            , w->target?w->target->name:w->name
+            , (w->hidden)?"hidden":"-"
+            , (w->debug_enabled)?"debug":"-"
+    );
+
+    return w;
+}
+
+// read the apps_groups.conf file
+static int read_apps_groups_conf(const char *path, const char *file)
+{
+    char filename[FILENAME_MAX + 1];
+
+    snprintfz(filename, FILENAME_MAX, "%s/apps_%s.conf", path, file);
+
+    debug_log("process groups file: '%s'", filename);
+
+    // ----------------------------------------
+
+    procfile *ff = procfile_open(filename, " :\t", PROCFILE_FLAG_DEFAULT);
+    if(!ff) return 1;
+
+    procfile_set_quotes(ff, "'\"");
+
+    ff = procfile_readall(ff);
+    if(!ff)
+        return 1;
+
+    size_t line, lines = procfile_lines(ff);
+
+    for(line = 0; line < lines ;line++) {
+        size_t word, words = procfile_linewords(ff, line);
+        if(!words) continue;
+
+        char *name = procfile_lineword(ff, line, 0);
+        if(!name || !*name) continue;
+
+        // find a possibly existing target
+        struct target *w = NULL;
+
+        // loop through all words, skipping the first one (the name)
+        for(word = 0; word < words ;word++) {
+            char *s = procfile_lineword(ff, line, word);
+            if(!s || !*s) continue;
+            if(*s == '#') break;
+
+            // is this the first word? skip it
+            if(s == name) continue;
+
+            // add this target
+            struct target *n = get_apps_groups_target(s, w, name);
+            if(!n) {
+                error("Cannot create target '%s' (line %zu, word %zu)", s, line, word);
+                continue;
+            }
+
+            // just some optimization
+            // to avoid searching for a target for each process
+            if(!w) w = n->target?n->target:n;
+        }
+    }
+
+    procfile_close(ff);
+
+    apps_groups_default_target = get_apps_groups_target("p+!o@w#e$i^r&7*5(-i)l-o_", NULL, "other"); // match nothing
+    if(!apps_groups_default_target)
+        fatal("Cannot create default target");
+
+    // allow the user to override group 'other'
+    if(apps_groups_default_target->target)
+        apps_groups_default_target = apps_groups_default_target->target;
+
+    return 0;
+}
+
+
+// ----------------------------------------------------------------------------
+// struct pid_stat management
+static inline void init_pid_fds(struct pid_stat *p, size_t first, size_t size);
+
+static inline struct pid_stat *get_pid_entry(pid_t pid) {
+    if(unlikely(all_pids[pid]))
+        return all_pids[pid];
+
+    struct pid_stat *p = callocz(sizeof(struct pid_stat), 1);
+    p->fds = mallocz(sizeof(struct pid_fd) * MAX_SPARE_FDS);
+    p->fds_size = MAX_SPARE_FDS;
+    init_pid_fds(p, 0, p->fds_size);
+
+    if(likely(root_of_pids))
+        root_of_pids->prev = p;
+
+    p->next = root_of_pids;
+    root_of_pids = p;
+
+    p->pid = pid;
+
+    all_pids[pid] = p;
+    all_pids_count++;
+
+    return p;
+}
+
+static inline void del_pid_entry(pid_t pid) {
+    struct pid_stat *p = all_pids[pid];
+
+    if(unlikely(!p)) {
+        error("attempted to free pid %d that is not allocated.", pid);
+        return;
+    }
+
+    debug_log("process %d %s exited, deleting it.", pid, p->comm);
+
+    if(root_of_pids == p)
+        root_of_pids = p->next;
+
+    if(p->next) p->next->prev = p->prev;
+    if(p->prev) p->prev->next = p->next;
+
+    // free the filename
+#ifndef __FreeBSD__
+    {
+        size_t i;
+        for(i = 0; i < p->fds_size; i++)
+            if(p->fds[i].filename)
+                freez(p->fds[i].filename);
+    }
+#endif
+    freez(p->fds);
+
+    freez(p->fds_dirname);
+    freez(p->stat_filename);
+    freez(p->status_filename);
+#ifndef __FreeBSD__
+    arl_free(p->status_arl);
+#endif
+    freez(p->io_filename);
+    freez(p->cmdline_filename);
+    freez(p->cmdline);
+    freez(p);
+
+    all_pids[pid] = NULL;
+    all_pids_count--;
+}
+
+// ----------------------------------------------------------------------------
+
+static inline int managed_log(struct pid_stat *p, uint32_t log, int status) {
+    if(unlikely(!status)) {
+        // error("command failed log %u, errno %d", log, errno);
+
+        if(unlikely(debug_enabled || errno != ENOENT)) {
+            if(unlikely(debug_enabled || !(p->log_thrown & log))) {
+                p->log_thrown |= log;
+                switch(log) {
+                    case PID_LOG_IO:
+                        #ifdef __FreeBSD__
+                        error("Cannot fetch process %d I/O info (command '%s')", p->pid, p->comm);
+                        #else
+                        error("Cannot process %s/proc/%d/io (command '%s')", netdata_configured_host_prefix, p->pid, p->comm);
+                        #endif
+                        break;
+
+                    case PID_LOG_STATUS:
+                        #ifdef __FreeBSD__
+                        error("Cannot fetch process %d status info (command '%s')", p->pid, p->comm);
+                        #else
+                        error("Cannot process %s/proc/%d/status (command '%s')", netdata_configured_host_prefix, p->pid, p->comm);
+                        #endif
+                        break;
+
+                    case PID_LOG_CMDLINE:
+                        #ifdef __FreeBSD__
+                        error("Cannot fetch process %d command line (command '%s')", p->pid, p->comm);
+                        #else
+                        error("Cannot process %s/proc/%d/cmdline (command '%s')", netdata_configured_host_prefix, p->pid, p->comm);
+                        #endif
+                        break;
+
+                    case PID_LOG_FDS:
+                        #ifdef __FreeBSD__
+                        error("Cannot fetch process %d files (command '%s')", p->pid, p->comm);
+                        #else
+                        error("Cannot process entries in %s/proc/%d/fd (command '%s')", netdata_configured_host_prefix, p->pid, p->comm);
+                        #endif
+                        break;
+
+                    case PID_LOG_STAT:
+                        break;
+
+                    default:
+                        error("unhandled error for pid %d, command '%s'", p->pid, p->comm);
+                        break;
+                }
+            }
+        }
+        errno = 0;
+    }
+    else if(unlikely(p->log_thrown & log)) {
+        // error("unsetting log %u on pid %d", log, p->pid);
+        p->log_thrown &= ~log;
+    }
+
+    return status;
+}
+
+static inline void assign_target_to_pid(struct pid_stat *p) {
+    targets_assignment_counter++;
+
+    uint32_t hash = simple_hash(p->comm);
+    size_t pclen  = strlen(p->comm);
+
+    struct target *w;
+    for(w = apps_groups_root_target; w ; w = w->next) {
+        // if(debug_enabled || (p->target && p->target->debug_enabled)) debug_log_int("\t\tcomparing '%s' with '%s'", w->compare, p->comm);
+
+        // find it - 4 cases:
+        // 1. the target is not a pattern
+        // 2. the target has the prefix
+        // 3. the target has the suffix
+        // 4. the target is something inside cmdline
+
+        if(unlikely(( (!w->starts_with && !w->ends_with && w->comparehash == hash && !strcmp(w->compare, p->comm))
+                      || (w->starts_with && !w->ends_with && !strncmp(w->compare, p->comm, w->comparelen))
+                      || (!w->starts_with && w->ends_with && pclen >= w->comparelen && !strcmp(w->compare, &p->comm[pclen - w->comparelen]))
+                      || (proc_pid_cmdline_is_needed && w->starts_with && w->ends_with && p->cmdline && strstr(p->cmdline, w->compare))
+                    ))) {
+
+            if(w->target) p->target = w->target;
+            else p->target = w;
+
+            if(debug_enabled || (p->target && p->target->debug_enabled))
+                debug_log_int("%s linked to target %s", p->comm, p->target->name);
+
+            break;
+        }
+    }
+}
+
+
+// ----------------------------------------------------------------------------
+// update pids from proc
+
+static inline int read_proc_pid_cmdline(struct pid_stat *p) {
+    static char cmdline[MAX_CMDLINE + 1];
+
+#ifdef __FreeBSD__
+    size_t i, bytes = MAX_CMDLINE;
+    int mib[4];
+
+    mib[0] = CTL_KERN;
+    mib[1] = KERN_PROC;
+    mib[2] = KERN_PROC_ARGS;
+    mib[3] = p->pid;
+    if (unlikely(sysctl(mib, 4, cmdline, &bytes, NULL, 0)))
+        goto cleanup;
+#else
+    if(unlikely(!p->cmdline_filename)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s/proc/%d/cmdline", netdata_configured_host_prefix, p->pid);
+        p->cmdline_filename = strdupz(filename);
+    }
+
+    int fd = open(p->cmdline_filename, procfile_open_flags, 0666);
+    if(unlikely(fd == -1)) goto cleanup;
+
+    ssize_t i, bytes = read(fd, cmdline, MAX_CMDLINE);
+    close(fd);
+
+    if(unlikely(bytes < 0)) goto cleanup;
+#endif
+
+    cmdline[bytes] = '\0';
+    for(i = 0; i < bytes ; i++) {
+        if(unlikely(!cmdline[i])) cmdline[i] = ' ';
+    }
+
+    if(p->cmdline) freez(p->cmdline);
+    p->cmdline = strdupz(cmdline);
+
+    debug_log("Read file '%s' contents: %s", p->cmdline_filename, p->cmdline);
+
+    return 1;
+
+cleanup:
+    // copy the command to the command line
+    if(p->cmdline) freez(p->cmdline);
+    p->cmdline = strdupz(p->comm);
+    return 0;
+}
+
+// ----------------------------------------------------------------------------
+// macro to calculate the incremental rate of a value
+// each parameter is accessed only ONCE - so it is safe to pass function calls
+// or other macros as parameters
+
+#define incremental_rate(rate_variable, last_kernel_variable, new_kernel_value, collected_usec, last_collected_usec) { \
+        kernel_uint_t _new_tmp = new_kernel_value; \
+        (rate_variable) = (_new_tmp - (last_kernel_variable)) * (USEC_PER_SEC * RATES_DETAIL) / ((collected_usec) - (last_collected_usec)); \
+        (last_kernel_variable) = _new_tmp; \
+    }
+
+// the same macro for struct pid members
+#define pid_incremental_rate(type, var, value) \
+    incremental_rate(var, var##_raw, value, p->type##_collected_usec, p->last_##type##_collected_usec)
+
+
+// ----------------------------------------------------------------------------
+
+#ifndef __FreeBSD__
+struct arl_callback_ptr {
+    struct pid_stat *p;
+    procfile *ff;
+    size_t line;
+};
+
+void arl_callback_status_uid(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 5)) return;
+
+    //const char *real_uid = procfile_lineword(aptr->ff, aptr->line, 1);
+    const char *effective_uid = procfile_lineword(aptr->ff, aptr->line, 2);
+    //const char *saved_uid = procfile_lineword(aptr->ff, aptr->line, 3);
+    //const char *filesystem_uid = procfile_lineword(aptr->ff, aptr->line, 4);
+
+    if(likely(effective_uid && *effective_uid))
+        aptr->p->uid = (uid_t)str2l(effective_uid);
+}
+
+void arl_callback_status_gid(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 5)) return;
+
+    //const char *real_gid = procfile_lineword(aptr->ff, aptr->line, 1);
+    const char *effective_gid = procfile_lineword(aptr->ff, aptr->line, 2);
+    //const char *saved_gid = procfile_lineword(aptr->ff, aptr->line, 3);
+    //const char *filesystem_gid = procfile_lineword(aptr->ff, aptr->line, 4);
+
+    if(likely(effective_gid && *effective_gid))
+        aptr->p->gid = (uid_t)str2l(effective_gid);
+}
+
+void arl_callback_status_vmsize(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 3)) return;
+
+    aptr->p->status_vmsize = str2kernel_uint_t(procfile_lineword(aptr->ff, aptr->line, 1));
+}
+
+void arl_callback_status_vmswap(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 3)) return;
+
+    aptr->p->status_vmswap = str2kernel_uint_t(procfile_lineword(aptr->ff, aptr->line, 1));
+}
+
+void arl_callback_status_vmrss(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 3)) return;
+
+    aptr->p->status_vmrss = str2kernel_uint_t(procfile_lineword(aptr->ff, aptr->line, 1));
+}
+
+void arl_callback_status_rssfile(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 3)) return;
+
+    aptr->p->status_rssfile = str2kernel_uint_t(procfile_lineword(aptr->ff, aptr->line, 1));
+}
+
+void arl_callback_status_rssshmem(const char *name, uint32_t hash, const char *value, void *dst) {
+    (void)name; (void)hash; (void)value;
+    struct arl_callback_ptr *aptr = (struct arl_callback_ptr *)dst;
+    if(unlikely(procfile_linewords(aptr->ff, aptr->line) < 3)) return;
+
+    aptr->p->status_rssshmem = str2kernel_uint_t(procfile_lineword(aptr->ff, aptr->line, 1));
+}
+#endif // !__FreeBSD__
+
+static inline int read_proc_pid_status(struct pid_stat *p, void *ptr) {
+    p->status_vmsize           = 0;
+    p->status_vmrss            = 0;
+    p->status_vmshared         = 0;
+    p->status_rssfile          = 0;
+    p->status_rssshmem         = 0;
+    p->status_vmswap           = 0;
+
+#ifdef __FreeBSD__
+    struct kinfo_proc *proc_info = (struct kinfo_proc *)ptr;
+
+    p->uid                  = proc_info->ki_uid;
+    p->gid                  = proc_info->ki_groups[0];
+    p->status_vmsize        = proc_info->ki_size / 1024; // in kB
+    p->status_vmrss         = proc_info->ki_rssize * pagesize / 1024; // in kB
+    // TODO: what about shared and swap memory on FreeBSD?
+    return 1;
+#else
+    (void)ptr;
+
+    static struct arl_callback_ptr arl_ptr;
+    static procfile *ff = NULL;
+
+    if(unlikely(!p->status_arl)) {
+        p->status_arl = arl_create("/proc/pid/status", NULL, 60);
+        arl_expect_custom(p->status_arl, "Uid", arl_callback_status_uid, &arl_ptr);
+        arl_expect_custom(p->status_arl, "Gid", arl_callback_status_gid, &arl_ptr);
+        arl_expect_custom(p->status_arl, "VmSize", arl_callback_status_vmsize, &arl_ptr);
+        arl_expect_custom(p->status_arl, "VmRSS", arl_callback_status_vmrss, &arl_ptr);
+        arl_expect_custom(p->status_arl, "RssFile", arl_callback_status_rssfile, &arl_ptr);
+        arl_expect_custom(p->status_arl, "RssShmem", arl_callback_status_rssshmem, &arl_ptr);
+        arl_expect_custom(p->status_arl, "VmSwap", arl_callback_status_vmswap, &arl_ptr);
+    }
+
+    if(unlikely(!p->status_filename)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s/proc/%d/status", netdata_configured_host_prefix, p->pid);
+        p->status_filename = strdupz(filename);
+    }
+
+    ff = procfile_reopen(ff, p->status_filename, (!ff)?" \t:,-()/":NULL, PROCFILE_FLAG_NO_ERROR_ON_FILE_IO);
+    if(unlikely(!ff)) return 0;
+
+    ff = procfile_readall(ff);
+    if(unlikely(!ff)) return 0;
+
+    calls_counter++;
+
+    // let ARL use this pid
+    arl_ptr.p = p;
+    arl_ptr.ff = ff;
+
+    size_t lines = procfile_lines(ff), l;
+    arl_begin(p->status_arl);
+
+    for(l = 0; l < lines ;l++) {
+        // debug_log("CHECK: line %zu of %zu, key '%s' = '%s'", l, lines, procfile_lineword(ff, l, 0), procfile_lineword(ff, l, 1));
+        arl_ptr.line = l;
+        if(unlikely(arl_check(p->status_arl,
+                procfile_lineword(ff, l, 0),
+                procfile_lineword(ff, l, 1)))) break;
+    }
+
+    p->status_vmshared = p->status_rssfile + p->status_rssshmem;
+
+    // debug_log("%s uid %d, gid %d, VmSize %zu, VmRSS %zu, RssFile %zu, RssShmem %zu, shared %zu", p->comm, (int)p->uid, (int)p->gid, p->status_vmsize, p->status_vmrss, p->status_rssfile, p->status_rssshmem, p->status_vmshared);
+
+    return 1;
+#endif
+}
+
+
+// ----------------------------------------------------------------------------
+
+static inline int read_proc_pid_stat(struct pid_stat *p, void *ptr) {
+    (void)ptr;
+
+#ifdef __FreeBSD__
+    struct kinfo_proc *proc_info = (struct kinfo_proc *)ptr;
+
+    if (unlikely(proc_info->ki_tdflags & TDF_IDLETD))
+        goto cleanup;
+#else
+    static procfile *ff = NULL;
+
+    if(unlikely(!p->stat_filename)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s/proc/%d/stat", netdata_configured_host_prefix, p->pid);
+        p->stat_filename = strdupz(filename);
+    }
+
+    int set_quotes = (!ff)?1:0;
+
+    ff = procfile_reopen(ff, p->stat_filename, NULL, PROCFILE_FLAG_NO_ERROR_ON_FILE_IO);
+    if(unlikely(!ff)) goto cleanup;
+
+    // if(set_quotes) procfile_set_quotes(ff, "()");
+    if(unlikely(set_quotes))
+        procfile_set_open_close(ff, "(", ")");
+
+    ff = procfile_readall(ff);
+    if(unlikely(!ff)) goto cleanup;
+#endif
+
+    p->last_stat_collected_usec = p->stat_collected_usec;
+    p->stat_collected_usec = now_monotonic_usec();
+    calls_counter++;
+
+#ifdef __FreeBSD__
+    char *comm          = proc_info->ki_comm;
+    p->ppid             = proc_info->ki_ppid;
+#else
+    // p->pid           = str2pid_t(procfile_lineword(ff, 0, 0));
+    char *comm          = procfile_lineword(ff, 0, 1);
+    // p->state         = *(procfile_lineword(ff, 0, 2));
+    p->ppid             = (int32_t)str2pid_t(procfile_lineword(ff, 0, 3));
+    // p->pgrp          = (int32_t)str2pid_t(procfile_lineword(ff, 0, 4));
+    // p->session       = (int32_t)str2pid_t(procfile_lineword(ff, 0, 5));
+    // p->tty_nr        = (int32_t)str2pid_t(procfile_lineword(ff, 0, 6));
+    // p->tpgid         = (int32_t)str2pid_t(procfile_lineword(ff, 0, 7));
+    // p->flags         = str2uint64_t(procfile_lineword(ff, 0, 8));
+#endif
+
+    if(strcmp(p->comm, comm) != 0) {
+        if(unlikely(debug_enabled)) {
+            if(p->comm[0])
+                debug_log("\tpid %d (%s) changed name to '%s'", p->pid, p->comm, comm);
+            else
+                debug_log("\tJust added %d (%s)", p->pid, comm);
+        }
+
+        strncpyz(p->comm, comm, MAX_COMPARE_NAME);
+
+        // /proc/<pid>/cmdline
+        if(likely(proc_pid_cmdline_is_needed))
+            managed_log(p, PID_LOG_CMDLINE, read_proc_pid_cmdline(p));
+
+        assign_target_to_pid(p);
+    }
+
+#ifdef __FreeBSD__
+    pid_incremental_rate(stat, p->minflt,  (kernel_uint_t)proc_info->ki_rusage.ru_minflt);
+    pid_incremental_rate(stat, p->cminflt, (kernel_uint_t)proc_info->ki_rusage_ch.ru_minflt);
+    pid_incremental_rate(stat, p->majflt,  (kernel_uint_t)proc_info->ki_rusage.ru_majflt);
+    pid_incremental_rate(stat, p->cmajflt, (kernel_uint_t)proc_info->ki_rusage_ch.ru_majflt);
+    pid_incremental_rate(stat, p->utime,   (kernel_uint_t)proc_info->ki_rusage.ru_utime.tv_sec * 100 + proc_info->ki_rusage.ru_utime.tv_usec / 10000);
+    pid_incremental_rate(stat, p->stime,   (kernel_uint_t)proc_info->ki_rusage.ru_stime.tv_sec * 100 + proc_info->ki_rusage.ru_stime.tv_usec / 10000);
+    pid_incremental_rate(stat, p->cutime,  (kernel_uint_t)proc_info->ki_rusage_ch.ru_utime.tv_sec * 100 + proc_info->ki_rusage_ch.ru_utime.tv_usec / 10000);
+    pid_incremental_rate(stat, p->cstime,  (kernel_uint_t)proc_info->ki_rusage_ch.ru_stime.tv_sec * 100 + proc_info->ki_rusage_ch.ru_stime.tv_usec / 10000);
+
+    p->num_threads      = proc_info->ki_numthreads;
+
+    if(enable_guest_charts) {
+        enable_guest_charts = 0;
+        info("Guest charts aren't supported by FreeBSD");
+    }
+#else
+    pid_incremental_rate(stat, p->minflt,  str2kernel_uint_t(procfile_lineword(ff, 0,  9)));
+    pid_incremental_rate(stat, p->cminflt, str2kernel_uint_t(procfile_lineword(ff, 0, 10)));
+    pid_incremental_rate(stat, p->majflt,  str2kernel_uint_t(procfile_lineword(ff, 0, 11)));
+    pid_incremental_rate(stat, p->cmajflt, str2kernel_uint_t(procfile_lineword(ff, 0, 12)));
+    pid_incremental_rate(stat, p->utime,   str2kernel_uint_t(procfile_lineword(ff, 0, 13)));
+    pid_incremental_rate(stat, p->stime,   str2kernel_uint_t(procfile_lineword(ff, 0, 14)));
+    pid_incremental_rate(stat, p->cutime,  str2kernel_uint_t(procfile_lineword(ff, 0, 15)));
+    pid_incremental_rate(stat, p->cstime,  str2kernel_uint_t(procfile_lineword(ff, 0, 16)));
+    // p->priority      = str2kernel_uint_t(procfile_lineword(ff, 0, 17));
+    // p->nice          = str2kernel_uint_t(procfile_lineword(ff, 0, 18));
+    p->num_threads      = (int32_t)str2uint32_t(procfile_lineword(ff, 0, 19));
+    // p->itrealvalue   = str2kernel_uint_t(procfile_lineword(ff, 0, 20));
+    // p->starttime     = str2kernel_uint_t(procfile_lineword(ff, 0, 21));
+    // p->vsize         = str2kernel_uint_t(procfile_lineword(ff, 0, 22));
+    // p->rss           = str2kernel_uint_t(procfile_lineword(ff, 0, 23));
+    // p->rsslim        = str2kernel_uint_t(procfile_lineword(ff, 0, 24));
+    // p->starcode      = str2kernel_uint_t(procfile_lineword(ff, 0, 25));
+    // p->endcode       = str2kernel_uint_t(procfile_lineword(ff, 0, 26));
+    // p->startstack    = str2kernel_uint_t(procfile_lineword(ff, 0, 27));
+    // p->kstkesp       = str2kernel_uint_t(procfile_lineword(ff, 0, 28));
+    // p->kstkeip       = str2kernel_uint_t(procfile_lineword(ff, 0, 29));
+    // p->signal        = str2kernel_uint_t(procfile_lineword(ff, 0, 30));
+    // p->blocked       = str2kernel_uint_t(procfile_lineword(ff, 0, 31));
+    // p->sigignore     = str2kernel_uint_t(procfile_lineword(ff, 0, 32));
+    // p->sigcatch      = str2kernel_uint_t(procfile_lineword(ff, 0, 33));
+    // p->wchan         = str2kernel_uint_t(procfile_lineword(ff, 0, 34));
+    // p->nswap         = str2kernel_uint_t(procfile_lineword(ff, 0, 35));
+    // p->cnswap        = str2kernel_uint_t(procfile_lineword(ff, 0, 36));
+    // p->exit_signal   = str2kernel_uint_t(procfile_lineword(ff, 0, 37));
+    // p->processor     = str2kernel_uint_t(procfile_lineword(ff, 0, 38));
+    // p->rt_priority   = str2kernel_uint_t(procfile_lineword(ff, 0, 39));
+    // p->policy        = str2kernel_uint_t(procfile_lineword(ff, 0, 40));
+    // p->delayacct_blkio_ticks = str2kernel_uint_t(procfile_lineword(ff, 0, 41));
+
+    if(enable_guest_charts) {
+
+        pid_incremental_rate(stat, p->gtime,  str2kernel_uint_t(procfile_lineword(ff, 0, 42)));
+        pid_incremental_rate(stat, p->cgtime, str2kernel_uint_t(procfile_lineword(ff, 0, 43)));
+
+        if (show_guest_time || p->gtime || p->cgtime) {
+            p->utime -= (p->utime >= p->gtime) ? p->gtime : p->utime;
+            p->cutime -= (p->cutime >= p->cgtime) ? p->cgtime : p->cutime;
+            show_guest_time = 1;
+        }
+    }
+#endif
+
+    if(unlikely(debug_enabled || (p->target && p->target->debug_enabled)))
+        debug_log_int("READ PROC/PID/STAT: %s/proc/%d/stat, process: '%s' on target '%s' (dt=%llu) VALUES: utime=" KERNEL_UINT_FORMAT ", stime=" KERNEL_UINT_FORMAT ", cutime=" KERNEL_UINT_FORMAT ", cstime=" KERNEL_UINT_FORMAT ", minflt=" KERNEL_UINT_FORMAT ", majflt=" KERNEL_UINT_FORMAT ", cminflt=" KERNEL_UINT_FORMAT ", cmajflt=" KERNEL_UINT_FORMAT ", threads=%d", netdata_configured_host_prefix, p->pid, p->comm, (p->target)?p->target->name:"UNSET", p->stat_collected_usec - p->last_stat_collected_usec, p->utime, p->stime, p->cutime, p->cstime, p->minflt, p->majflt, p->cminflt, p->cmajflt, p->num_threads);
+
+    if(unlikely(global_iterations_counter == 1)) {
+        p->minflt           = 0;
+        p->cminflt          = 0;
+        p->majflt           = 0;
+        p->cmajflt          = 0;
+        p->utime            = 0;
+        p->stime            = 0;
+        p->gtime            = 0;
+        p->cutime           = 0;
+        p->cstime           = 0;
+        p->cgtime           = 0;
+    }
+
+    return 1;
+
+cleanup:
+    p->minflt           = 0;
+    p->cminflt          = 0;
+    p->majflt           = 0;
+    p->cmajflt          = 0;
+    p->utime            = 0;
+    p->stime            = 0;
+    p->gtime            = 0;
+    p->cutime           = 0;
+    p->cstime           = 0;
+    p->cgtime           = 0;
+    p->num_threads      = 0;
+    // p->rss              = 0;
+    return 0;
+}
+
+static inline int read_proc_pid_io(struct pid_stat *p, void *ptr) {
+    (void)ptr;
+#ifdef __FreeBSD__
+    struct kinfo_proc *proc_info = (struct kinfo_proc *)ptr;
+#else
+    static procfile *ff = NULL;
+
+    if(unlikely(!p->io_filename)) {
+        char filename[FILENAME_MAX + 1];
+        snprintfz(filename, FILENAME_MAX, "%s/proc/%d/io", netdata_configured_host_prefix, p->pid);
+        p->io_filename = strdupz(filename);
+    }
+
+    // open the file
+    ff = procfile_reopen(ff, p->io_filename, NULL, PROCFILE_FLAG_NO_ERROR_ON_FILE_IO);
+    if(unlikely(!ff)) goto cleanup;
+
+    ff = procfile_readall(ff);
+    if(unlikely(!ff)) goto cleanup;
+#endif
+
+    calls_counter++;
+
+    p->last_io_collected_usec = p->io_collected_usec;
+    p->io_collected_usec = now_monotonic_usec();
+
+#ifdef __FreeBSD__
+    pid_incremental_rate(io, p->io_storage_bytes_read,       proc_info->ki_rusage.ru_inblock);
+    pid_incremental_rate(io, p->io_storage_bytes_written,    proc_info->ki_rusage.ru_oublock);
+#else
+    pid_incremental_rate(io, p->io_logical_bytes_read,       str2kernel_uint_t(procfile_lineword(ff, 0,  1)));
+    pid_incremental_rate(io, p->io_logical_bytes_written,    str2kernel_uint_t(procfile_lineword(ff, 1,  1)));
+    // pid_incremental_rate(io, p->io_read_calls,               str2kernel_uint_t(procfile_lineword(ff, 2,  1)));
+    // pid_incremental_rate(io, p->io_write_calls,              str2kernel_uint_t(procfile_lineword(ff, 3,  1)));
+    pid_incremental_rate(io, p->io_storage_bytes_read,       str2kernel_uint_t(procfile_lineword(ff, 4,  1)));
+    pid_incremental_rate(io, p->io_storage_bytes_written,    str2kernel_uint_t(procfile_lineword(ff, 5,  1)));
+    // pid_incremental_rate(io, p->io_cancelled_write_bytes,    str2kernel_uint_t(procfile_lineword(ff, 6,  1)));
+#endif
+
+    if(unlikely(global_iterations_counter == 1)) {
+        p->io_logical_bytes_read        = 0;
+        p->io_logical_bytes_written     = 0;
+        // p->io_read_calls             = 0;
+        // p->io_write_calls            = 0;
+        p->io_storage_bytes_read        = 0;
+        p->io_storage_bytes_written     = 0;
+        // p->io_cancelled_write_bytes  = 0;
+    }
+
+    return 1;
+
+#ifndef __FreeBSD__
+cleanup:
+    p->io_logical_bytes_read        = 0;
+    p->io_logical_bytes_written     = 0;
+    // p->io_read_calls             = 0;
+    // p->io_write_calls            = 0;
+    p->io_storage_bytes_read        = 0;
+    p->io_storage_bytes_written     = 0;
+    // p->io_cancelled_write_bytes  = 0;
+    return 0;
+#endif
+}
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+static inline int read_proc_stat() {
+    static char filename[FILENAME_MAX + 1] = "";
+    static procfile *ff = NULL;
+    static kernel_uint_t utime_raw = 0, stime_raw = 0, gtime_raw = 0, gntime_raw = 0, ntime_raw = 0;
+    static usec_t collected_usec = 0, last_collected_usec = 0;
+
+    if(unlikely(!ff)) {
+        snprintfz(filename, FILENAME_MAX, "%s/proc/stat", netdata_configured_host_prefix);
+        ff = procfile_open(filename, " \t:", PROCFILE_FLAG_DEFAULT);
+        if(unlikely(!ff)) goto cleanup;
+    }
+
+    ff = procfile_readall(ff);
+    if(unlikely(!ff)) goto cleanup;
+
+    last_collected_usec = collected_usec;
+    collected_usec = now_monotonic_usec();
+
+    calls_counter++;
+
+    // temporary - it is added global_ntime;
+    kernel_uint_t global_ntime = 0;
+
+    incremental_rate(global_utime, utime_raw, str2kernel_uint_t(procfile_lineword(ff, 0,  1)), collected_usec, last_collected_usec);
+    incremental_rate(global_ntime, ntime_raw, str2kernel_uint_t(procfile_lineword(ff, 0,  2)), collected_usec, last_collected_usec);
+    incremental_rate(global_stime, stime_raw, str2kernel_uint_t(procfile_lineword(ff, 0,  3)), collected_usec, last_collected_usec);
+    incremental_rate(global_gtime, gtime_raw, str2kernel_uint_t(procfile_lineword(ff, 0, 10)), collected_usec, last_collected_usec);
+
+    global_utime += global_ntime;
+
+    if(enable_guest_charts) {
+        // temporary - it is added global_ntime;
+        kernel_uint_t global_gntime = 0;
+
+        // guest nice time, on guest time
+        incremental_rate(global_gntime, gntime_raw, str2kernel_uint_t(procfile_lineword(ff, 0, 11)), collected_usec, last_collected_usec);
+
+        global_gtime += global_gntime;
+
+        // remove guest time from user time
+        global_utime -= (global_utime > global_gtime) ? global_gtime : global_utime;
+    }
+
+    if(unlikely(global_iterations_counter == 1)) {
+        global_utime = 0;
+        global_stime = 0;
+        global_gtime = 0;
+    }
+
+    return 1;
+
+cleanup:
+    global_utime = 0;
+    global_stime = 0;
+    global_gtime = 0;
+    return 0;
+}
+#else
+static inline int read_proc_stat() {
+    return 0;
+}
+#endif
+
+// ----------------------------------------------------------------------------
+
+int file_descriptor_compare(void* a, void* b) {
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(((struct file_descriptor *)a)->magic != 0x0BADCAFE || ((struct file_descriptor *)b)->magic != 0x0BADCAFE)
+        error("Corrupted index data detected. Please report this.");
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+    if(((struct file_descriptor *)a)->hash < ((struct file_descriptor *)b)->hash)
+        return -1;
+
+    else if(((struct file_descriptor *)a)->hash > ((struct file_descriptor *)b)->hash)
+        return 1;
+
+    else
+        return strcmp(((struct file_descriptor *)a)->name, ((struct file_descriptor *)b)->name);
+}
+
+// int file_descriptor_iterator(avl *a) { if(a) {}; return 0; }
+
+avl_tree all_files_index = {
+        NULL,
+        file_descriptor_compare
+};
+
+static struct file_descriptor *file_descriptor_find(const char *name, uint32_t hash) {
+    struct file_descriptor tmp;
+    tmp.hash = (hash)?hash:simple_hash(name);
+    tmp.name = name;
+    tmp.count = 0;
+    tmp.pos = 0;
+#ifdef NETDATA_INTERNAL_CHECKS
+    tmp.magic = 0x0BADCAFE;
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+    return (struct file_descriptor *)avl_search(&all_files_index, (avl *) &tmp);
+}
+
+#define file_descriptor_add(fd) avl_insert(&all_files_index, (avl *)(fd))
+#define file_descriptor_remove(fd) avl_remove(&all_files_index, (avl *)(fd))
+
+// ----------------------------------------------------------------------------
+
+static inline void file_descriptor_not_used(int id)
+{
+    if(id > 0 && id < all_files_size) {
+
+#ifdef NETDATA_INTERNAL_CHECKS
+        if(all_files[id].magic != 0x0BADCAFE) {
+            error("Ignoring request to remove empty file id %d.", id);
+            return;
+        }
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+        debug_log("decreasing slot %d (count = %d).", id, all_files[id].count);
+
+        if(all_files[id].count > 0) {
+            all_files[id].count--;
+
+            if(!all_files[id].count) {
+                debug_log("  >> slot %d is empty.", id);
+
+                if(unlikely(file_descriptor_remove(&all_files[id]) != (void *)&all_files[id]))
+                    error("INTERNAL ERROR: removal of unused fd from index, removed a different fd");
+
+#ifdef NETDATA_INTERNAL_CHECKS
+                all_files[id].magic = 0x00000000;
+#endif /* NETDATA_INTERNAL_CHECKS */
+                all_files_len--;
+            }
+        }
+        else
+            error("Request to decrease counter of fd %d (%s), while the use counter is 0", id, all_files[id].name);
+    }
+    else    error("Request to decrease counter of fd %d, which is outside the array size (1 to %d)", id, all_files_size);
+}
+
+static inline void all_files_grow() {
+    void *old = all_files;
+    int i;
+
+    // there is no empty slot
+    debug_log("extending fd array to %d entries", all_files_size + FILE_DESCRIPTORS_INCREASE_STEP);
+
+    all_files = reallocz(all_files, (all_files_size + FILE_DESCRIPTORS_INCREASE_STEP) * sizeof(struct file_descriptor));
+
+    // if the address changed, we have to rebuild the index
+    // since all pointers are now invalid
+
+    if(unlikely(old && old != (void *)all_files)) {
+        debug_log("  >> re-indexing.");
+
+        all_files_index.root = NULL;
+        for(i = 0; i < all_files_size; i++) {
+            if(!all_files[i].count) continue;
+            if(unlikely(file_descriptor_add(&all_files[i]) != (void *)&all_files[i]))
+                error("INTERNAL ERROR: duplicate indexing of fd during realloc.");
+        }
+
+        debug_log("  >> re-indexing done.");
+    }
+
+    // initialize the newly added entries
+
+    for(i = all_files_size; i < (all_files_size + FILE_DESCRIPTORS_INCREASE_STEP); i++) {
+        all_files[i].count = 0;
+        all_files[i].name = NULL;
+#ifdef NETDATA_INTERNAL_CHECKS
+        all_files[i].magic = 0x00000000;
+#endif /* NETDATA_INTERNAL_CHECKS */
+        all_files[i].pos = i;
+    }
+
+    if(unlikely(!all_files_size)) all_files_len = 1;
+    all_files_size += FILE_DESCRIPTORS_INCREASE_STEP;
+}
+
+static inline int file_descriptor_set_on_empty_slot(const char *name, uint32_t hash, FD_FILETYPE type) {
+    // check we have enough memory to add it
+    if(!all_files || all_files_len == all_files_size)
+        all_files_grow();
+
+    debug_log("  >> searching for empty slot.");
+
+    // search for an empty slot
+
+    static int last_pos = 0;
+    int i, c;
+    for(i = 0, c = last_pos ; i < all_files_size ; i++, c++) {
+        if(c >= all_files_size) c = 0;
+        if(c == 0) continue;
+
+        if(!all_files[c].count) {
+            debug_log("  >> Examining slot %d.", c);
+
+#ifdef NETDATA_INTERNAL_CHECKS
+            if(all_files[c].magic == 0x0BADCAFE && all_files[c].name && file_descriptor_find(all_files[c].name, all_files[c].hash))
+                error("fd on position %d is not cleared properly. It still has %s in it.", c, all_files[c].name);
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+            debug_log("  >> %s fd position %d for %s (last name: %s)", all_files[c].name?"re-using":"using", c, name, all_files[c].name);
+
+            freez((void *)all_files[c].name);
+            all_files[c].name = NULL;
+            last_pos = c;
+            break;
+        }
+    }
+
+    all_files_len++;
+
+    if(i == all_files_size) {
+        fatal("We should find an empty slot, but there isn't any");
+        exit(1);
+    }
+    // else we have an empty slot in 'c'
+
+    debug_log("  >> updating slot %d.", c);
+
+    all_files[c].name = strdupz(name);
+    all_files[c].hash = hash;
+    all_files[c].type = type;
+    all_files[c].pos  = c;
+    all_files[c].count = 1;
+#ifdef NETDATA_INTERNAL_CHECKS
+    all_files[c].magic = 0x0BADCAFE;
+#endif /* NETDATA_INTERNAL_CHECKS */
+    if(unlikely(file_descriptor_add(&all_files[c]) != (void *)&all_files[c]))
+        error("INTERNAL ERROR: duplicate indexing of fd.");
+
+    debug_log("using fd position %d (name: %s)", c, all_files[c].name);
+
+    return c;
+}
+
+static inline int file_descriptor_find_or_add(const char *name, uint32_t hash) {
+    if(unlikely(!hash))
+        hash = simple_hash(name);
+
+    debug_log("adding or finding name '%s' with hash %u", name, hash);
+
+    struct file_descriptor *fd = file_descriptor_find(name, hash);
+    if(fd) {
+        // found
+        debug_log("  >> found on slot %d", fd->pos);
+
+        fd->count++;
+        return fd->pos;
+    }
+    // not found
+
+    FD_FILETYPE type;
+    if(likely(name[0] == '/')) type = FILETYPE_FILE;
+    else if(likely(strncmp(name, "pipe:", 5) == 0)) type = FILETYPE_PIPE;
+    else if(likely(strncmp(name, "socket:", 7) == 0)) type = FILETYPE_SOCKET;
+    else if(likely(strncmp(name, "anon_inode:", 11) == 0)) {
+        const char *t = &name[11];
+
+             if(strcmp(t, "inotify") == 0) type = FILETYPE_INOTIFY;
+        else if(strcmp(t, "[eventfd]") == 0) type = FILETYPE_EVENTFD;
+        else if(strcmp(t, "[eventpoll]") == 0) type = FILETYPE_EVENTPOLL;
+        else if(strcmp(t, "[timerfd]") == 0) type = FILETYPE_TIMERFD;
+        else if(strcmp(t, "[signalfd]") == 0) type = FILETYPE_SIGNALFD;
+        else {
+            debug_log("UNKNOWN anonymous inode: %s", name);
+            type = FILETYPE_OTHER;
+        }
+    }
+    else if(likely(strcmp(name, "inotify") == 0)) type = FILETYPE_INOTIFY;
+    else {
+        debug_log("UNKNOWN linkname: %s", name);
+        type = FILETYPE_OTHER;
+    }
+
+    return file_descriptor_set_on_empty_slot(name, hash, type);
+}
+
+static inline void clear_pid_fd(struct pid_fd *pfd) {
+    pfd->fd = 0;
+
+    #ifndef __FreeBSD__
+    pfd->link_hash = 0;
+    pfd->inode = 0;
+    pfd->cache_iterations_counter = 0;
+    pfd->cache_iterations_reset = 0;
+#endif
+}
+
+static inline void make_all_pid_fds_negative(struct pid_stat *p) {
+    struct pid_fd *pfd = p->fds, *pfdend = &p->fds[p->fds_size];
+    while(pfd < pfdend) {
+        pfd->fd = -(pfd->fd);
+        pfd++;
+    }
+}
+
+static inline void cleanup_negative_pid_fds(struct pid_stat *p) {
+    struct pid_fd *pfd = p->fds, *pfdend = &p->fds[p->fds_size];
+
+    while(pfd < pfdend) {
+        int fd = pfd->fd;
+
+        if(unlikely(fd < 0)) {
+            file_descriptor_not_used(-(fd));
+            clear_pid_fd(pfd);
+        }
+
+        pfd++;
+    }
+}
+
+static inline void init_pid_fds(struct pid_stat *p, size_t first, size_t size) {
+    struct pid_fd *pfd = &p->fds[first], *pfdend = &p->fds[first + size];
+    size_t i = first;
+
+    while(pfd < pfdend) {
+#ifndef __FreeBSD__
+        pfd->filename = NULL;
+#endif
+        clear_pid_fd(pfd);
+        pfd++;
+        i++;
+    }
+}
+
+static inline int read_pid_file_descriptors(struct pid_stat *p, void *ptr) {
+    (void)ptr;
+#ifdef __FreeBSD__
+    int mib[4];
+    size_t size;
+    struct kinfo_file *fds;
+    static char *fdsbuf;
+    char *bfdsbuf, *efdsbuf;
+    char fdsname[FILENAME_MAX + 1];
+
+    // we make all pid fds negative, so that
+    // we can detect unused file descriptors
+    // at the end, to free them
+    make_all_pid_fds_negative(p);
+
+    mib[0] = CTL_KERN;
+    mib[1] = KERN_PROC;
+    mib[2] = KERN_PROC_FILEDESC;
+    mib[3] = p->pid;
+
+    if (unlikely(sysctl(mib, 4, NULL, &size, NULL, 0))) {
+        error("sysctl error: Can't get file descriptors data size for pid %d", p->pid);
+        return 0;
+    }
+    if (likely(size > 0))
+        fdsbuf = reallocz(fdsbuf, size);
+    if (unlikely(sysctl(mib, 4, fdsbuf, &size, NULL, 0))) {
+        error("sysctl error: Can't get file descriptors data for pid %d", p->pid);
+        return 0;
+    }
+
+    bfdsbuf = fdsbuf;
+    efdsbuf = fdsbuf + size;
+    while (bfdsbuf < efdsbuf) {
+        fds = (struct kinfo_file *)(uintptr_t)bfdsbuf;
+        if (unlikely(fds->kf_structsize == 0))
+            break;
+
+        // do not process file descriptors for current working directory, root directory,
+        // jail directory, ktrace vnode, text vnode and controlling terminal
+        if (unlikely(fds->kf_fd < 0)) {
+            bfdsbuf += fds->kf_structsize;
+            continue;
+        }
+
+        // get file descriptors array index
+        int fdid = fds->kf_fd;
+
+        // check if the fds array is small
+        if (unlikely(fdid >= p->fds_size)) {
+            // it is small, extend it
+
+            debug_log("extending fd memory slots for %s from %d to %d", p->comm, p->fds_size, fdid + MAX_SPARE_FDS);
+
+            p->fds = reallocz(p->fds, (fdid + MAX_SPARE_FDS) * sizeof(struct pid_fd));
+
+            // and initialize it
+            init_pid_fds(p, p->fds_size, (fdid + MAX_SPARE_FDS) - p->fds_size);
+            p->fds_size = fdid + MAX_SPARE_FDS;
+        }
+
+        if (unlikely(p->fds[fdid].fd == 0)) {
+            // we don't know this fd, get it
+
+            switch (fds->kf_type) {
+                case KF_TYPE_FIFO:
+                case KF_TYPE_VNODE:
+                    if (unlikely(!fds->kf_path[0])) {
+                        sprintf(fdsname, "other: inode: %lu", fds->kf_un.kf_file.kf_file_fileid);
+                        break;
+                    }
+                    sprintf(fdsname, "%s", fds->kf_path);
+                    break;
+                case KF_TYPE_SOCKET:
+                    switch (fds->kf_sock_domain) {
+                        case AF_INET:
+                        case AF_INET6:
+                            if (fds->kf_sock_protocol == IPPROTO_TCP)
+                                sprintf(fdsname, "socket: %d %lx", fds->kf_sock_protocol, fds->kf_un.kf_sock.kf_sock_inpcb);
+                            else
+                                sprintf(fdsname, "socket: %d %lx", fds->kf_sock_protocol, fds->kf_un.kf_sock.kf_sock_pcb);
+                            break;
+                        case AF_UNIX:
+                            /* print address of pcb and connected pcb */
+                            sprintf(fdsname, "socket: %lx %lx", fds->kf_un.kf_sock.kf_sock_pcb, fds->kf_un.kf_sock.kf_sock_unpconn);
+                            break;
+                        default:
+                            /* print protocol number and socket address */
+#if __FreeBSD_version < 1200031
+                            sprintf(fdsname, "socket: other: %d %s %s", fds->kf_sock_protocol, fds->kf_sa_local.__ss_pad1, fds->kf_sa_local.__ss_pad2);
+#else
+                            sprintf(fdsname, "socket: other: %d %s %s", fds->kf_sock_protocol, fds->kf_un.kf_sock.kf_sa_local.__ss_pad1, fds->kf_un.kf_sock.kf_sa_local.__ss_pad2);
+#endif
+                    }
+                    break;
+                case KF_TYPE_PIPE:
+                    sprintf(fdsname, "pipe: %lu %lu", fds->kf_un.kf_pipe.kf_pipe_addr, fds->kf_un.kf_pipe.kf_pipe_peer);
+                    break;
+                case KF_TYPE_PTS:
+#if __FreeBSD_version < 1200031
+                    sprintf(fdsname, "other: pts: %u", fds->kf_un.kf_pts.kf_pts_dev);
+#else
+                    sprintf(fdsname, "other: pts: %lu", fds->kf_un.kf_pts.kf_pts_dev);
+#endif
+                    break;
+                case KF_TYPE_SHM:
+                    sprintf(fdsname, "other: shm: %s size: %lu", fds->kf_path, fds->kf_un.kf_file.kf_file_size);
+                    break;
+                case KF_TYPE_SEM:
+                    sprintf(fdsname, "other: sem: %u", fds->kf_un.kf_sem.kf_sem_value);
+                    break;
+                default:
+                    sprintf(fdsname, "other: pid: %d fd: %d", fds->kf_un.kf_proc.kf_pid, fds->kf_fd);
+            }
+
+            // if another process already has this, we will get
+            // the same id
+            p->fds[fdid].fd = file_descriptor_find_or_add(fdsname, 0);
+        }
+
+            // else make it positive again, we need it
+            // of course, the actual file may have changed
+
+        else
+            p->fds[fdid].fd = -p->fds[fdid].fd;
+
+        bfdsbuf += fds->kf_structsize;
+    }
+#else
+    if(unlikely(!p->fds_dirname)) {
+        char dirname[FILENAME_MAX+1];
+        snprintfz(dirname, FILENAME_MAX, "%s/proc/%d/fd", netdata_configured_host_prefix, p->pid);
+        p->fds_dirname = strdupz(dirname);
+    }
+
+    DIR *fds = opendir(p->fds_dirname);
+    if(unlikely(!fds)) return 0;
+
+    struct dirent *de;
+    char linkname[FILENAME_MAX + 1];
+
+    // we make all pid fds negative, so that
+    // we can detect unused file descriptors
+    // at the end, to free them
+    make_all_pid_fds_negative(p);
+
+    while((de = readdir(fds))) {
+        // we need only files with numeric names
+
+        if(unlikely(de->d_name[0] < '0' || de->d_name[0] > '9'))
+            continue;
+
+        // get its number
+        int fdid = (int) str2l(de->d_name);
+        if(unlikely(fdid < 0)) continue;
+
+        // check if the fds array is small
+        if(unlikely((size_t)fdid >= p->fds_size)) {
+            // it is small, extend it
+
+            debug_log("extending fd memory slots for %s from %d to %d"
+                    , p->comm
+                    , p->fds_size
+                    , fdid + MAX_SPARE_FDS
+            );
+
+            p->fds = reallocz(p->fds, (fdid + MAX_SPARE_FDS) * sizeof(struct pid_fd));
+
+            // and initialize it
+            init_pid_fds(p, p->fds_size, (fdid + MAX_SPARE_FDS) - p->fds_size);
+            p->fds_size = (size_t)fdid + MAX_SPARE_FDS;
+        }
+
+        if(unlikely(p->fds[fdid].fd < 0 && de->d_ino != p->fds[fdid].inode)) {
+            // inodes do not match, clear the previous entry
+            inodes_changed_counter++;
+            file_descriptor_not_used(-p->fds[fdid].fd);
+            clear_pid_fd(&p->fds[fdid]);
+        }
+
+        if(p->fds[fdid].fd < 0 && p->fds[fdid].cache_iterations_counter > 0) {
+            p->fds[fdid].fd = -p->fds[fdid].fd;
+            p->fds[fdid].cache_iterations_counter--;
+            continue;
+        }
+
+        if(unlikely(!p->fds[fdid].filename)) {
+            filenames_allocated_counter++;
+            char fdname[FILENAME_MAX + 1];
+            snprintfz(fdname, FILENAME_MAX, "%s/proc/%d/fd/%s", netdata_configured_host_prefix, p->pid, de->d_name);
+            p->fds[fdid].filename = strdupz(fdname);
+        }
+
+        file_counter++;
+        ssize_t l = readlink(p->fds[fdid].filename, linkname, FILENAME_MAX);
+        if(unlikely(l == -1)) {
+            // cannot read the link
+
+            if(debug_enabled || (p->target && p->target->debug_enabled))
+                error("Cannot read link %s", p->fds[fdid].filename);
+
+            if(unlikely(p->fds[fdid].fd < 0)) {
+                file_descriptor_not_used(-p->fds[fdid].fd);
+                clear_pid_fd(&p->fds[fdid]);
+            }
+
+            continue;
+        }
+        else
+            linkname[l] = '\0';
+
+        uint32_t link_hash = simple_hash(linkname);
+
+        if(unlikely(p->fds[fdid].fd < 0 && p->fds[fdid].link_hash != link_hash)) {
+            // the link changed
+            links_changed_counter++;
+            file_descriptor_not_used(-p->fds[fdid].fd);
+            clear_pid_fd(&p->fds[fdid]);
+        }
+
+        if(unlikely(p->fds[fdid].fd == 0)) {
+            // we don't know this fd, get it
+
+            // if another process already has this, we will get
+            // the same id
+            p->fds[fdid].fd = file_descriptor_find_or_add(linkname, link_hash);
+            p->fds[fdid].inode = de->d_ino;
+            p->fds[fdid].link_hash = link_hash;
+        }
+        else {
+            // else make it positive again, we need it
+            p->fds[fdid].fd = -p->fds[fdid].fd;
+        }
+
+        // caching control
+        // without this we read all the files on every iteration
+        if(max_fds_cache_seconds > 0) {
+            size_t spread = ((size_t)max_fds_cache_seconds > 10) ? 10 : (size_t)max_fds_cache_seconds;
+
+            // cache it for a few iterations
+            size_t max = ((size_t) max_fds_cache_seconds + (fdid % spread)) / (size_t) update_every;
+            p->fds[fdid].cache_iterations_reset++;
+
+            if(unlikely(p->fds[fdid].cache_iterations_reset % spread == (size_t) fdid % spread))
+                p->fds[fdid].cache_iterations_reset++;
+
+            if(unlikely((fdid <= 2 && p->fds[fdid].cache_iterations_reset > 5) ||
+                        p->fds[fdid].cache_iterations_reset > max)) {
+                // for stdin, stdout, stderr (fdid <= 2) we have checked a few times, or if it goes above the max, goto max
+                p->fds[fdid].cache_iterations_reset = max;
+            }
+
+            p->fds[fdid].cache_iterations_counter = p->fds[fdid].cache_iterations_reset;
+        }
+    }
+
+    closedir(fds);
+#endif
+    cleanup_negative_pid_fds(p);
+
+    return 1;
+}
+
+// ----------------------------------------------------------------------------
+
+static inline int debug_print_process_and_parents(struct pid_stat *p, usec_t time) {
+    char *prefix = "\\_ ";
+    int indent = 0;
+
+    if(p->parent)
+        indent = debug_print_process_and_parents(p->parent, p->stat_collected_usec);
+    else
+        prefix = " > ";
+
+    char buffer[indent + 1];
+    int i;
+
+    for(i = 0; i < indent ;i++) buffer[i] = ' ';
+    buffer[i] = '\0';
+
+    fprintf(stderr, "  %s %s%s (%d %s %llu"
+        , buffer
+        , prefix
+        , p->comm
+        , p->pid
+        , p->updated?"running":"exited"
+        , p->stat_collected_usec - time
+        );
+
+    if(p->utime)   fprintf(stderr, " utime=" KERNEL_UINT_FORMAT,   p->utime);
+    if(p->stime)   fprintf(stderr, " stime=" KERNEL_UINT_FORMAT,   p->stime);
+    if(p->gtime)   fprintf(stderr, " gtime=" KERNEL_UINT_FORMAT,   p->gtime);
+    if(p->cutime)  fprintf(stderr, " cutime=" KERNEL_UINT_FORMAT,  p->cutime);
+    if(p->cstime)  fprintf(stderr, " cstime=" KERNEL_UINT_FORMAT,  p->cstime);
+    if(p->cgtime)  fprintf(stderr, " cgtime=" KERNEL_UINT_FORMAT,  p->cgtime);
+    if(p->minflt)  fprintf(stderr, " minflt=" KERNEL_UINT_FORMAT,  p->minflt);
+    if(p->cminflt) fprintf(stderr, " cminflt=" KERNEL_UINT_FORMAT, p->cminflt);
+    if(p->majflt)  fprintf(stderr, " majflt=" KERNEL_UINT_FORMAT,  p->majflt);
+    if(p->cmajflt) fprintf(stderr, " cmajflt=" KERNEL_UINT_FORMAT, p->cmajflt);
+    fprintf(stderr, ")\n");
+
+    return indent + 1;
+}
+
+static inline void debug_print_process_tree(struct pid_stat *p, char *msg) {
+    debug_log("%s: process %s (%d, %s) with parents:", msg, p->comm, p->pid, p->updated?"running":"exited");
+    debug_print_process_and_parents(p, p->stat_collected_usec);
+}
+
+static inline void debug_find_lost_child(struct pid_stat *pe, kernel_uint_t lost, int type) {
+    int found = 0;
+    struct pid_stat *p = NULL;
+
+    for(p = root_of_pids; p ; p = p->next) {
+        if(p == pe) continue;
+
+        switch(type) {
+            case 1:
+                if(p->cminflt > lost) {
+                    fprintf(stderr, " > process %d (%s) could use the lost exited child minflt " KERNEL_UINT_FORMAT " of process %d (%s)\n", p->pid, p->comm, lost, pe->pid, pe->comm);
+                    found++;
+                }
+                break;
+
+            case 2:
+                if(p->cmajflt > lost) {
+                    fprintf(stderr, " > process %d (%s) could use the lost exited child majflt " KERNEL_UINT_FORMAT " of process %d (%s)\n", p->pid, p->comm, lost, pe->pid, pe->comm);
+                    found++;
+                }
+                break;
+
+            case 3:
+                if(p->cutime > lost) {
+                    fprintf(stderr, " > process %d (%s) could use the lost exited child utime " KERNEL_UINT_FORMAT " of process %d (%s)\n", p->pid, p->comm, lost, pe->pid, pe->comm);
+                    found++;
+                }
+                break;
+
+            case 4:
+                if(p->cstime > lost) {
+                    fprintf(stderr, " > process %d (%s) could use the lost exited child stime " KERNEL_UINT_FORMAT " of process %d (%s)\n", p->pid, p->comm, lost, pe->pid, pe->comm);
+                    found++;
+                }
+                break;
+
+            case 5:
+                if(p->cgtime > lost) {
+                    fprintf(stderr, " > process %d (%s) could use the lost exited child gtime " KERNEL_UINT_FORMAT " of process %d (%s)\n", p->pid, p->comm, lost, pe->pid, pe->comm);
+                    found++;
+                }
+                break;
+        }
+    }
+
+    if(!found) {
+        switch(type) {
+            case 1:
+                fprintf(stderr, " > cannot find any process to use the lost exited child minflt " KERNEL_UINT_FORMAT " of process %d (%s)\n", lost, pe->pid, pe->comm);
+                break;
+
+            case 2:
+                fprintf(stderr, " > cannot find any process to use the lost exited child majflt " KERNEL_UINT_FORMAT " of process %d (%s)\n", lost, pe->pid, pe->comm);
+                break;
+
+            case 3:
+                fprintf(stderr, " > cannot find any process to use the lost exited child utime " KERNEL_UINT_FORMAT " of process %d (%s)\n", lost, pe->pid, pe->comm);
+                break;
+
+            case 4:
+                fprintf(stderr, " > cannot find any process to use the lost exited child stime " KERNEL_UINT_FORMAT " of process %d (%s)\n", lost, pe->pid, pe->comm);
+                break;
+
+            case 5:
+                fprintf(stderr, " > cannot find any process to use the lost exited child gtime " KERNEL_UINT_FORMAT " of process %d (%s)\n", lost, pe->pid, pe->comm);
+                break;
+        }
+    }
+}
+
+static inline kernel_uint_t remove_exited_child_from_parent(kernel_uint_t *field, kernel_uint_t *pfield) {
+    kernel_uint_t absorbed = 0;
+
+    if(*field > *pfield) {
+        absorbed += *pfield;
+        *field -= *pfield;
+        *pfield = 0;
+    }
+    else {
+        absorbed += *field;
+        *pfield -= *field;
+        *field = 0;
+    }
+
+    return absorbed;
+}
+
+static inline void process_exited_processes() {
+    struct pid_stat *p;
+
+    for(p = root_of_pids; p ; p = p->next) {
+        if(p->updated || !p->stat_collected_usec)
+            continue;
+
+        kernel_uint_t utime  = (p->utime_raw + p->cutime_raw)   * (USEC_PER_SEC * RATES_DETAIL) / (p->stat_collected_usec - p->last_stat_collected_usec);
+        kernel_uint_t stime  = (p->stime_raw + p->cstime_raw)   * (USEC_PER_SEC * RATES_DETAIL) / (p->stat_collected_usec - p->last_stat_collected_usec);
+        kernel_uint_t gtime  = (p->gtime_raw + p->cgtime_raw)   * (USEC_PER_SEC * RATES_DETAIL) / (p->stat_collected_usec - p->last_stat_collected_usec);
+        kernel_uint_t minflt = (p->minflt_raw + p->cminflt_raw) * (USEC_PER_SEC * RATES_DETAIL) / (p->stat_collected_usec - p->last_stat_collected_usec);
+        kernel_uint_t majflt = (p->majflt_raw + p->cmajflt_raw) * (USEC_PER_SEC * RATES_DETAIL) / (p->stat_collected_usec - p->last_stat_collected_usec);
+
+        if(utime + stime + gtime + minflt + majflt == 0)
+            continue;
+
+        if(unlikely(debug_enabled)) {
+            debug_log("Absorb %s (%d %s total resources: utime=" KERNEL_UINT_FORMAT " stime=" KERNEL_UINT_FORMAT " gtime=" KERNEL_UINT_FORMAT " minflt=" KERNEL_UINT_FORMAT " majflt=" KERNEL_UINT_FORMAT ")"
+                , p->comm
+                , p->pid
+                , p->updated?"running":"exited"
+                , utime
+                , stime
+                , gtime
+                , minflt
+                , majflt
+                );
+            debug_print_process_tree(p, "Searching parents");
+        }
+
+        struct pid_stat *pp;
+        for(pp = p->parent; pp ; pp = pp->parent) {
+            if(!pp->updated) continue;
+
+            kernel_uint_t absorbed;
+            absorbed = remove_exited_child_from_parent(&utime,  &pp->cutime);
+            if(unlikely(debug_enabled && absorbed))
+                debug_log(" > process %s (%d %s) absorbed " KERNEL_UINT_FORMAT " utime (remaining: " KERNEL_UINT_FORMAT ")", pp->comm, pp->pid, pp->updated?"running":"exited", absorbed, utime);
+
+            absorbed = remove_exited_child_from_parent(&stime,  &pp->cstime);
+            if(unlikely(debug_enabled && absorbed))
+                debug_log(" > process %s (%d %s) absorbed " KERNEL_UINT_FORMAT " stime (remaining: " KERNEL_UINT_FORMAT ")", pp->comm, pp->pid, pp->updated?"running":"exited", absorbed, stime);
+
+            absorbed = remove_exited_child_from_parent(&gtime,  &pp->cgtime);
+            if(unlikely(debug_enabled && absorbed))
+                debug_log(" > process %s (%d %s) absorbed " KERNEL_UINT_FORMAT " gtime (remaining: " KERNEL_UINT_FORMAT ")", pp->comm, pp->pid, pp->updated?"running":"exited", absorbed, gtime);
+
+            absorbed = remove_exited_child_from_parent(&minflt, &pp->cminflt);
+            if(unlikely(debug_enabled && absorbed))
+                debug_log(" > process %s (%d %s) absorbed " KERNEL_UINT_FORMAT " minflt (remaining: " KERNEL_UINT_FORMAT ")", pp->comm, pp->pid, pp->updated?"running":"exited", absorbed, minflt);
+
+            absorbed = remove_exited_child_from_parent(&majflt, &pp->cmajflt);
+            if(unlikely(debug_enabled && absorbed))
+                debug_log(" > process %s (%d %s) absorbed " KERNEL_UINT_FORMAT " majflt (remaining: " KERNEL_UINT_FORMAT ")", pp->comm, pp->pid, pp->updated?"running":"exited", absorbed, majflt);
+        }
+
+        if(unlikely(utime + stime + gtime + minflt + majflt > 0)) {
+            if(unlikely(debug_enabled)) {
+                if(utime) debug_find_lost_child(p, utime, 3);
+                if(stime) debug_find_lost_child(p, stime, 4);
+                if(gtime) debug_find_lost_child(p, gtime, 5);
+                if(minflt) debug_find_lost_child(p, minflt, 1);
+                if(majflt) debug_find_lost_child(p, majflt, 2);
+            }
+
+            p->keep = 1;
+
+            debug_log(" > remaining resources - KEEP - for another loop: %s (%d %s total resources: utime=" KERNEL_UINT_FORMAT " stime=" KERNEL_UINT_FORMAT " gtime=" KERNEL_UINT_FORMAT " minflt=" KERNEL_UINT_FORMAT " majflt=" KERNEL_UINT_FORMAT ")"
+                , p->comm
+                , p->pid
+                , p->updated?"running":"exited"
+                , utime
+                , stime
+                , gtime
+                , minflt
+                , majflt
+            );
+
+            for(pp = p->parent; pp ; pp = pp->parent) {
+                if(pp->updated) break;
+                pp->keep = 1;
+
+                debug_log(" > - KEEP - parent for another loop: %s (%d %s)"
+                    , pp->comm
+                    , pp->pid
+                    , pp->updated?"running":"exited"
+                );
+            }
+
+            p->utime_raw   = utime  * (p->stat_collected_usec - p->last_stat_collected_usec) / (USEC_PER_SEC * RATES_DETAIL);
+            p->stime_raw   = stime  * (p->stat_collected_usec - p->last_stat_collected_usec) / (USEC_PER_SEC * RATES_DETAIL);
+            p->gtime_raw   = gtime  * (p->stat_collected_usec - p->last_stat_collected_usec) / (USEC_PER_SEC * RATES_DETAIL);
+            p->minflt_raw  = minflt * (p->stat_collected_usec - p->last_stat_collected_usec) / (USEC_PER_SEC * RATES_DETAIL);
+            p->majflt_raw  = majflt * (p->stat_collected_usec - p->last_stat_collected_usec) / (USEC_PER_SEC * RATES_DETAIL);
+            p->cutime_raw = p->cstime_raw = p->cgtime_raw = p->cminflt_raw = p->cmajflt_raw = 0;
+
+            debug_log(" ");
+        }
+        else
+            debug_log(" > totally absorbed - DONE - %s (%d %s)"
+                , p->comm
+                , p->pid
+                , p->updated?"running":"exited"
+            );
+    }
+}
+
+static inline void link_all_processes_to_their_parents(void) {
+    struct pid_stat *p, *pp;
+
+    // link all children to their parents
+    // and update children count on parents
+    for(p = root_of_pids; p ; p = p->next) {
+        // for each process found
+
+        p->sortlist = 0;
+        p->parent = NULL;
+
+        if(unlikely(!p->ppid)) {
+            p->parent = NULL;
+            continue;
+        }
+
+        pp = all_pids[p->ppid];
+        if(likely(pp)) {
+            p->parent = pp;
+            pp->children_count++;
+
+            if(unlikely(debug_enabled || (p->target && p->target->debug_enabled)))
+                debug_log_int("child %d (%s, %s) on target '%s' has parent %d (%s, %s). Parent: utime=" KERNEL_UINT_FORMAT ", stime=" KERNEL_UINT_FORMAT ", gtime=" KERNEL_UINT_FORMAT ", minflt=" KERNEL_UINT_FORMAT ", majflt=" KERNEL_UINT_FORMAT ", cutime=" KERNEL_UINT_FORMAT ", cstime=" KERNEL_UINT_FORMAT ", cgtime=" KERNEL_UINT_FORMAT ", cminflt=" KERNEL_UINT_FORMAT ", cmajflt=" KERNEL_UINT_FORMAT "", p->pid, p->comm, p->updated?"running":"exited", (p->target)?p->target->name:"UNSET", pp->pid, pp->comm, pp->updated?"running":"exited", pp->utime, pp->stime, pp->gtime, pp->minflt, pp->majflt, pp->cutime, pp->cstime, pp->cgtime, pp->cminflt, pp->cmajflt);
+        }
+        else {
+            p->parent = NULL;
+            error("pid %d %s states parent %d, but the later does not exist.", p->pid, p->comm, p->ppid);
+        }
+    }
+}
+
+// ----------------------------------------------------------------------------
+
+// 1. read all files in /proc
+// 2. for each numeric directory:
+//    i.   read /proc/pid/stat
+//    ii.  read /proc/pid/status
+//    iii. read /proc/pid/io (requires root access)
+//    iii. read the entries in directory /proc/pid/fd (requires root access)
+//         for each entry:
+//         a. find or create a struct file_descriptor
+//         b. cleanup any old/unused file_descriptors
+
+// after all these, some pids may be linked to targets, while others may not
+
+// in case of errors, only 1 every 1000 errors is printed
+// to avoid filling up all disk space
+// if debug is enabled, all errors are printed
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+static int compar_pid(const void *pid1, const void *pid2) {
+
+    struct pid_stat *p1 = all_pids[*((pid_t *)pid1)];
+    struct pid_stat *p2 = all_pids[*((pid_t *)pid2)];
+
+    if(p1->sortlist > p2->sortlist)
+        return -1;
+    else
+        return 1;
+}
+#endif
+
+static inline int collect_data_for_pid(pid_t pid, void *ptr) {
+    if(unlikely(pid < 0 || pid > pid_max)) {
+        error("Invalid pid %d read (expected %d to %d). Ignoring process.", pid, 0, pid_max);
+        return 0;
+    }
+
+    struct pid_stat *p = get_pid_entry(pid);
+    if(unlikely(!p || p->read)) return 0;
+    p->read = 1;
+
+    // debug_log("Reading process %d (%s), sortlist %d", p->pid, p->comm, p->sortlist);
+
+    // --------------------------------------------------------------------
+    // /proc/<pid>/stat
+
+    if(unlikely(!managed_log(p, PID_LOG_STAT, read_proc_pid_stat(p, ptr))))
+        // there is no reason to proceed if we cannot get its status
+        return 0;
+
+    // check its parent pid
+    if(unlikely(p->ppid < 0 || p->ppid > pid_max)) {
+        error("Pid %d (command '%s') states invalid parent pid %d. Using 0.", pid, p->comm, p->ppid);
+        p->ppid = 0;
+    }
+
+    // --------------------------------------------------------------------
+    // /proc/<pid>/io
+
+    managed_log(p, PID_LOG_IO, read_proc_pid_io(p, ptr));
+
+    // --------------------------------------------------------------------
+    // /proc/<pid>/status
+
+    if(unlikely(!managed_log(p, PID_LOG_STATUS, read_proc_pid_status(p, ptr))))
+        // there is no reason to proceed if we cannot get its status
+        return 0;
+
+    // --------------------------------------------------------------------
+    // /proc/<pid>/fd
+
+    if(enable_file_charts)
+            managed_log(p, PID_LOG_FDS, read_pid_file_descriptors(p, ptr));
+
+    // --------------------------------------------------------------------
+    // done!
+
+    if(unlikely(debug_enabled && include_exited_childs && all_pids_count && p->ppid && all_pids[p->ppid] && !all_pids[p->ppid]->read))
+        debug_log("Read process %d (%s) sortlisted %d, but its parent %d (%s) sortlisted %d, is not read", p->pid, p->comm, p->sortlist, all_pids[p->ppid]->pid, all_pids[p->ppid]->comm, all_pids[p->ppid]->sortlist);
+
+    // mark it as updated
+    p->updated = 1;
+    p->keep = 0;
+    p->keeploops = 0;
+
+    return 1;
+}
+
+static int collect_data_for_all_processes(void) {
+    struct pid_stat *p = NULL;
+
+#ifdef __FreeBSD__
+    int i, procnum;
+
+    static size_t procbase_size = 0;
+    static struct kinfo_proc *procbase = NULL;
+
+    size_t new_procbase_size;
+
+    int mib[3] = { CTL_KERN, KERN_PROC, KERN_PROC_PROC };
+    if (unlikely(sysctl(mib, 3, NULL, &new_procbase_size, NULL, 0))) {
+        error("sysctl error: Can't get processes data size");
+        return 0;
+    }
+
+    // give it some air for processes that may be started
+    // during this little time.
+    new_procbase_size += 100 * sizeof(struct kinfo_proc);
+
+    // increase the buffer if needed
+    if(new_procbase_size > procbase_size) {
+        procbase_size = new_procbase_size;
+        procbase = reallocz(procbase, procbase_size);
+    }
+
+    // sysctl() gets from new_procbase_size the buffer size
+    // and also returns to it the amount of data filled in
+    new_procbase_size = procbase_size;
+
+    // get the processes from the system
+    if (unlikely(sysctl(mib, 3, procbase, &new_procbase_size, NULL, 0))) {
+        error("sysctl error: Can't get processes data");
+        return 0;
+    }
+
+    // based on the amount of data filled in
+    // calculate the number of processes we got
+    procnum = new_procbase_size / sizeof(struct kinfo_proc);
+
+#endif
+
+    if(all_pids_count) {
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+        size_t slc = 0;
+#endif
+        for(p = root_of_pids; p ; p = p->next) {
+            p->read             = 0; // mark it as not read, so that collect_data_for_pid() will read it
+            p->updated          = 0;
+            p->merged           = 0;
+            p->children_count   = 0;
+            p->parent           = NULL;
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+            all_pids_sortlist[slc++] = p->pid;
+#endif
+        }
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+        if(unlikely(slc != all_pids_count)) {
+            error("Internal error: I was thinking I had %zu processes in my arrays, but it seems there are %zu.", all_pids_count, slc);
+            all_pids_count = slc;
+        }
+
+        if(include_exited_childs) {
+            // Read parents before childs
+            // This is needed to prevent a situation where
+            // a child is found running, but until we read
+            // its parent, it has exited and its parent
+            // has accumulated its resources.
+
+            qsort((void *)all_pids_sortlist, (size_t)all_pids_count, sizeof(pid_t), compar_pid);
+
+            // we forward read all running processes
+            // collect_data_for_pid() is smart enough,
+            // not to read the same pid twice per iteration
+            for(slc = 0; slc < all_pids_count; slc++)
+                collect_data_for_pid(all_pids_sortlist[slc], NULL);
+        }
+#endif
+    }
+
+#ifdef __FreeBSD__
+    for (i = 0 ; i < procnum ; ++i) {
+        pid_t pid = procbase[i].ki_pid;
+        collect_data_for_pid(pid, &procbase[i]);
+    }
+#else
+    char dirname[FILENAME_MAX + 1];
+
+    snprintfz(dirname, FILENAME_MAX, "%s/proc", netdata_configured_host_prefix);
+    DIR *dir = opendir(dirname);
+    if(!dir) return 0;
+
+    struct dirent *de = NULL;
+
+    while((de = readdir(dir))) {
+        char *endptr = de->d_name;
+
+        if(unlikely(de->d_type != DT_DIR || de->d_name[0] < '0' || de->d_name[0] > '9'))
+            continue;
+
+        pid_t pid = (pid_t) strtoul(de->d_name, &endptr, 10);
+
+        // make sure we read a valid number
+        if(unlikely(endptr == de->d_name || *endptr != '\0'))
+            continue;
+
+        collect_data_for_pid(pid, NULL);
+    }
+    closedir(dir);
+#endif
+
+    if(!all_pids_count)
+        return 0;
+
+    // we need /proc/stat to normalize the cpu consumption of the exited childs
+    read_proc_stat();
+
+    // build the process tree
+    link_all_processes_to_their_parents();
+
+    // normally this is done
+    // however we may have processes exited while we collected values
+    // so let's find the exited ones
+    // we do this by collecting the ownership of process
+    // if we manage to get the ownership, the process still runs
+    process_exited_processes();
+
+    return 1;
+}
+
+// ----------------------------------------------------------------------------
+// update statistics on the targets
+
+// 1. link all childs to their parents
+// 2. go from bottom to top, marking as merged all childs to their parents
+//    this step links all parents without a target to the child target, if any
+// 3. link all top level processes (the ones not merged) to the default target
+// 4. go from top to bottom, linking all childs without a target, to their parent target
+//    after this step, all processes have a target
+// [5. for each killed pid (updated = 0), remove its usage from its target]
+// 6. zero all apps_groups_targets
+// 7. concentrate all values on the apps_groups_targets
+// 8. remove all killed processes
+// 9. find the unique file count for each target
+// check: update_apps_groups_statistics()
+
+static void cleanup_exited_pids(void) {
+    size_t c;
+    struct pid_stat *p = NULL;
+
+    for(p = root_of_pids; p ;) {
+        if(!p->updated && (!p->keep || p->keeploops > 0)) {
+            if(unlikely(debug_enabled && (p->keep || p->keeploops)))
+                debug_log(" > CLEANUP cannot keep exited process %d (%s) anymore - removing it.", p->pid, p->comm);
+
+            for(c = 0; c < p->fds_size; c++)
+                if(p->fds[c].fd > 0) {
+                    file_descriptor_not_used(p->fds[c].fd);
+                    clear_pid_fd(&p->fds[c]);
+                }
+
+            pid_t r = p->pid;
+            p = p->next;
+            del_pid_entry(r);
+        }
+        else {
+            if(unlikely(p->keep)) p->keeploops++;
+            p->keep = 0;
+            p = p->next;
+        }
+    }
+}
+
+static void apply_apps_groups_targets_inheritance(void) {
+    struct pid_stat *p = NULL;
+
+    // children that do not have a target
+    // inherit their target from their parent
+    int found = 1, loops = 0;
+    while(found) {
+        if(unlikely(debug_enabled)) loops++;
+        found = 0;
+        for(p = root_of_pids; p ; p = p->next) {
+            // if this process does not have a target
+            // and it has a parent
+            // and its parent has a target
+            // then, set the parent's target to this process
+            if(unlikely(!p->target && p->parent && p->parent->target)) {
+                p->target = p->parent->target;
+                found++;
+
+                if(debug_enabled || (p->target && p->target->debug_enabled))
+                    debug_log_int("TARGET INHERITANCE: %s is inherited by %d (%s) from its parent %d (%s).", p->target->name, p->pid, p->comm, p->parent->pid, p->parent->comm);
+            }
+        }
+    }
+
+    // find all the procs with 0 childs and merge them to their parents
+    // repeat, until nothing more can be done.
+    int sortlist = 1;
+    found = 1;
+    while(found) {
+        if(unlikely(debug_enabled)) loops++;
+        found = 0;
+
+        for(p = root_of_pids; p ; p = p->next) {
+            if(unlikely(!p->sortlist && !p->children_count))
+                p->sortlist = sortlist++;
+
+            if(unlikely(
+                    !p->children_count            // if this process does not have any children
+                    && !p->merged                 // and is not already merged
+                    && p->parent                  // and has a parent
+                    && p->parent->children_count  // and its parent has children
+                                                  // and the target of this process and its parent is the same,
+                                                  // or the parent does not have a target
+                    && (p->target == p->parent->target || !p->parent->target)
+                    && p->ppid != INIT_PID        // and its parent is not init
+                )) {
+                // mark it as merged
+                p->parent->children_count--;
+                p->merged = 1;
+
+                // the parent inherits the child's target, if it does not have a target itself
+                if(unlikely(p->target && !p->parent->target)) {
+                    p->parent->target = p->target;
+
+                    if(debug_enabled || (p->target && p->target->debug_enabled))
+                        debug_log_int("TARGET INHERITANCE: %s is inherited by %d (%s) from its child %d (%s).", p->target->name, p->parent->pid, p->parent->comm, p->pid, p->comm);
+                }
+
+                found++;
+            }
+        }
+
+        debug_log("TARGET INHERITANCE: merged %d processes", found);
+    }
+
+    // init goes always to default target
+    if(all_pids[INIT_PID])
+        all_pids[INIT_PID]->target = apps_groups_default_target;
+
+    // pid 0 goes always to default target
+    if(all_pids[0])
+        all_pids[0]->target = apps_groups_default_target;
+
+    // give a default target on all top level processes
+    if(unlikely(debug_enabled)) loops++;
+    for(p = root_of_pids; p ; p = p->next) {
+        // if the process is not merged itself
+        // then is is a top level process
+        if(unlikely(!p->merged && !p->target))
+            p->target = apps_groups_default_target;
+
+        // make sure all processes have a sortlist
+        if(unlikely(!p->sortlist))
+            p->sortlist = sortlist++;
+    }
+
+    if(all_pids[1])
+        all_pids[1]->sortlist = sortlist++;
+
+    // give a target to all merged child processes
+    found = 1;
+    while(found) {
+        if(unlikely(debug_enabled)) loops++;
+        found = 0;
+        for(p = root_of_pids; p ; p = p->next) {
+            if(unlikely(!p->target && p->merged && p->parent && p->parent->target)) {
+                p->target = p->parent->target;
+                found++;
+
+                if(debug_enabled || (p->target && p->target->debug_enabled))
+                    debug_log_int("TARGET INHERITANCE: %s is inherited by %d (%s) from its parent %d (%s) at phase 2.", p->target->name, p->pid, p->comm, p->parent->pid, p->parent->comm);
+            }
+        }
+    }
+
+    debug_log("apply_apps_groups_targets_inheritance() made %d loops on the process tree", loops);
+}
+
+static size_t zero_all_targets(struct target *root) {
+    struct target *w;
+    size_t count = 0;
+
+    for (w = root; w ; w = w->next) {
+        count++;
+
+        w->minflt = 0;
+        w->majflt = 0;
+        w->utime = 0;
+        w->stime = 0;
+        w->gtime = 0;
+        w->cminflt = 0;
+        w->cmajflt = 0;
+        w->cutime = 0;
+        w->cstime = 0;
+        w->cgtime = 0;
+        w->num_threads = 0;
+        // w->rss = 0;
+        w->processes = 0;
+
+        w->status_vmsize = 0;
+        w->status_vmrss = 0;
+        w->status_vmshared = 0;
+        w->status_rssfile = 0;
+        w->status_rssshmem = 0;
+        w->status_vmswap = 0;
+
+        w->io_logical_bytes_read = 0;
+        w->io_logical_bytes_written = 0;
+        // w->io_read_calls = 0;
+        // w->io_write_calls = 0;
+        w->io_storage_bytes_read = 0;
+        w->io_storage_bytes_written = 0;
+        // w->io_cancelled_write_bytes = 0;
+
+        // zero file counters
+        if(w->target_fds) {
+            memset(w->target_fds, 0, sizeof(int) * w->target_fds_size);
+            w->openfiles = 0;
+            w->openpipes = 0;
+            w->opensockets = 0;
+            w->openinotifies = 0;
+            w->openeventfds = 0;
+            w->opentimerfds = 0;
+            w->opensignalfds = 0;
+            w->openeventpolls = 0;
+            w->openother = 0;
+        }
+    }
+
+    return count;
+}
+
+static inline void reallocate_target_fds(struct target *w) {
+    if(unlikely(!w))
+        return;
+
+    if(unlikely(!w->target_fds || w->target_fds_size < all_files_size)) {
+        w->target_fds = reallocz(w->target_fds, sizeof(int) * all_files_size);
+        memset(&w->target_fds[w->target_fds_size], 0, sizeof(int) * (all_files_size - w->target_fds_size));
+        w->target_fds_size = all_files_size;
+    }
+}
+
+static inline void aggregate_fd_on_target(int fd, struct target *w) {
+    if(unlikely(!w))
+        return;
+
+    if(unlikely(w->target_fds[fd])) {
+        // it is already aggregated
+        // just increase its usage counter
+        w->target_fds[fd]++;
+        return;
+    }
+
+    // increase its usage counter
+    // so that we will not add it again
+    w->target_fds[fd]++;
+
+    switch(all_files[fd].type) {
+        case FILETYPE_FILE:
+            w->openfiles++;
+            break;
+
+        case FILETYPE_PIPE:
+            w->openpipes++;
+            break;
+
+        case FILETYPE_SOCKET:
+            w->opensockets++;
+            break;
+
+        case FILETYPE_INOTIFY:
+            w->openinotifies++;
+            break;
+
+        case FILETYPE_EVENTFD:
+            w->openeventfds++;
+            break;
+
+        case FILETYPE_TIMERFD:
+            w->opentimerfds++;
+            break;
+
+        case FILETYPE_SIGNALFD:
+            w->opensignalfds++;
+            break;
+
+        case FILETYPE_EVENTPOLL:
+            w->openeventpolls++;
+            break;
+
+        case FILETYPE_OTHER:
+            w->openother++;
+            break;
+    }
+}
+
+static inline void aggregate_pid_fds_on_targets(struct pid_stat *p) {
+
+    if(unlikely(!p->updated)) {
+        // the process is not running
+        return;
+    }
+
+    struct target *w = p->target, *u = p->user_target, *g = p->group_target;
+
+    reallocate_target_fds(w);
+    reallocate_target_fds(u);
+    reallocate_target_fds(g);
+
+    size_t c, size = p->fds_size;
+    struct pid_fd *fds = p->fds;
+    for(c = 0; c < size ;c++) {
+        int fd = fds[c].fd;
+
+        if(likely(fd <= 0 || fd >= all_files_size))
+            continue;
+
+        aggregate_fd_on_target(fd, w);
+        aggregate_fd_on_target(fd, u);
+        aggregate_fd_on_target(fd, g);
+    }
+}
+
+static inline void aggregate_pid_on_target(struct target *w, struct pid_stat *p, struct target *o) {
+    (void)o;
+
+    if(unlikely(!p->updated)) {
+        // the process is not running
+        return;
+    }
+
+    if(unlikely(!w)) {
+        error("pid %d %s was left without a target!", p->pid, p->comm);
+        return;
+    }
+
+    w->cutime  += p->cutime;
+    w->cstime  += p->cstime;
+    w->cgtime  += p->cgtime;
+    w->cminflt += p->cminflt;
+    w->cmajflt += p->cmajflt;
+
+    w->utime  += p->utime;
+    w->stime  += p->stime;
+    w->gtime  += p->gtime;
+    w->minflt += p->minflt;
+    w->majflt += p->majflt;
+
+    // w->rss += p->rss;
+
+    w->status_vmsize   += p->status_vmsize;
+    w->status_vmrss    += p->status_vmrss;
+    w->status_vmshared += p->status_vmshared;
+    w->status_rssfile  += p->status_rssfile;
+    w->status_rssshmem += p->status_rssshmem;
+    w->status_vmswap   += p->status_vmswap;
+
+    w->io_logical_bytes_read    += p->io_logical_bytes_read;
+    w->io_logical_bytes_written += p->io_logical_bytes_written;
+    // w->io_read_calls            += p->io_read_calls;
+    // w->io_write_calls           += p->io_write_calls;
+    w->io_storage_bytes_read    += p->io_storage_bytes_read;
+    w->io_storage_bytes_written += p->io_storage_bytes_written;
+    // w->io_cancelled_write_bytes += p->io_cancelled_write_bytes;
+
+    w->processes++;
+    w->num_threads += p->num_threads;
+
+    if(unlikely(debug_enabled || w->debug_enabled))
+        debug_log_int("aggregating '%s' pid %d on target '%s' utime=" KERNEL_UINT_FORMAT ", stime=" KERNEL_UINT_FORMAT ", gtime=" KERNEL_UINT_FORMAT ", cutime=" KERNEL_UINT_FORMAT ", cstime=" KERNEL_UINT_FORMAT ", cgtime=" KERNEL_UINT_FORMAT ", minflt=" KERNEL_UINT_FORMAT ", majflt=" KERNEL_UINT_FORMAT ", cminflt=" KERNEL_UINT_FORMAT ", cmajflt=" KERNEL_UINT_FORMAT "", p->comm, p->pid, w->name, p->utime, p->stime, p->gtime, p->cutime, p->cstime, p->cgtime, p->minflt, p->majflt, p->cminflt, p->cmajflt);
+}
+
+static void calculate_netdata_statistics(void) {
+
+    apply_apps_groups_targets_inheritance();
+
+    zero_all_targets(users_root_target);
+    zero_all_targets(groups_root_target);
+    apps_groups_targets_count = zero_all_targets(apps_groups_root_target);
+
+    // this has to be done, before the cleanup
+    struct pid_stat *p = NULL;
+    struct target *w = NULL, *o = NULL;
+
+    // concentrate everything on the targets
+    for(p = root_of_pids; p ; p = p->next) {
+
+        // --------------------------------------------------------------------
+        // apps_groups target
+
+        aggregate_pid_on_target(p->target, p, NULL);
+
+
+        // --------------------------------------------------------------------
+        // user target
+
+        o = p->user_target;
+        if(likely(p->user_target && p->user_target->uid == p->uid))
+            w = p->user_target;
+        else {
+            if(unlikely(debug_enabled && p->user_target))
+                debug_log("pid %d (%s) switched user from %u (%s) to %u.", p->pid, p->comm, p->user_target->uid, p->user_target->name, p->uid);
+
+            w = p->user_target = get_users_target(p->uid);
+        }
+
+        aggregate_pid_on_target(w, p, o);
+
+
+        // --------------------------------------------------------------------
+        // user group target
+
+        o = p->group_target;
+        if(likely(p->group_target && p->group_target->gid == p->gid))
+            w = p->group_target;
+        else {
+            if(unlikely(debug_enabled && p->group_target))
+                debug_log("pid %d (%s) switched group from %u (%s) to %u.", p->pid, p->comm, p->group_target->gid, p->group_target->name, p->gid);
+
+            w = p->group_target = get_groups_target(p->gid);
+        }
+
+        aggregate_pid_on_target(w, p, o);
+
+
+        // --------------------------------------------------------------------
+        // aggregate all file descriptors
+
+        if(enable_file_charts)
+            aggregate_pid_fds_on_targets(p);
+    }
+
+    cleanup_exited_pids();
+}
+
+// ----------------------------------------------------------------------------
+// update chart dimensions
+
+static inline void send_BEGIN(const char *type, const char *id, usec_t usec) {
+    fprintf(stdout, "BEGIN %s.%s %llu\n", type, id, usec);
+}
+
+static inline void send_SET(const char *name, kernel_uint_t value) {
+    fprintf(stdout, "SET %s = " KERNEL_UINT_FORMAT "\n", name, value);
+}
+
+static inline void send_END(void) {
+    fprintf(stdout, "END\n");
+}
+
+void send_resource_usage_to_netdata(usec_t dt) {
+    static struct timeval last = { 0, 0 };
+    static struct rusage me_last;
+
+    struct timeval now;
+    struct rusage me;
+
+    usec_t cpuuser;
+    usec_t cpusyst;
+
+    if(!last.tv_sec) {
+        now_monotonic_timeval(&last);
+        getrusage(RUSAGE_SELF, &me_last);
+
+        cpuuser = 0;
+        cpusyst = 0;
+    }
+    else {
+        now_monotonic_timeval(&now);
+        getrusage(RUSAGE_SELF, &me);
+
+        cpuuser = me.ru_utime.tv_sec * USEC_PER_SEC + me.ru_utime.tv_usec;
+        cpusyst = me.ru_stime.tv_sec * USEC_PER_SEC + me.ru_stime.tv_usec;
+
+        memmove(&last, &now, sizeof(struct timeval));
+        memmove(&me_last, &me, sizeof(struct rusage));
+    }
+
+    static char created_charts = 0;
+    if(unlikely(!created_charts)) {
+        created_charts = 1;
+
+        fprintf(stdout,
+                "CHART netdata.apps_cpu '' 'Apps Plugin CPU' 'milliseconds/s' apps.plugin netdata.apps_cpu stacked 140000 %1$d\n"
+                "DIMENSION user '' incremental 1 1000\n"
+                "DIMENSION system '' incremental 1 1000\n"
+                "CHART netdata.apps_sizes '' 'Apps Plugin Files' 'files/s' apps.plugin netdata.apps_sizes line 140001 %1$d\n"
+                "DIMENSION calls '' incremental 1 1\n"
+                "DIMENSION files '' incremental 1 1\n"
+                "DIMENSION filenames '' incremental 1 1\n"
+                "DIMENSION inode_changes '' incremental 1 1\n"
+                "DIMENSION link_changes '' incremental 1 1\n"
+                "DIMENSION pids '' absolute 1 1\n"
+                "DIMENSION fds '' absolute 1 1\n"
+                "DIMENSION targets '' absolute 1 1\n"
+                "DIMENSION new_pids 'new pids' incremental 1 1\n"
+                , update_every
+        );
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+        fprintf(stdout,
+                "CHART netdata.apps_fix '' 'Apps Plugin Normalization Ratios' 'percentage' apps.plugin netdata.apps_fix line 140002 %1$d\n"
+                "DIMENSION utime '' absolute 1 %2$llu\n"
+                "DIMENSION stime '' absolute 1 %2$llu\n"
+                "DIMENSION gtime '' absolute 1 %2$llu\n"
+                "DIMENSION minflt '' absolute 1 %2$llu\n"
+                "DIMENSION majflt '' absolute 1 %2$llu\n"
+                , update_every
+                , RATES_DETAIL
+        );
+
+        if(include_exited_childs)
+            fprintf(stdout,
+                    "CHART netdata.apps_children_fix '' 'Apps Plugin Exited Children Normalization Ratios' 'percentage' apps.plugin netdata.apps_children_fix line 140003 %1$d\n"
+                    "DIMENSION cutime '' absolute 1 %2$llu\n"
+                    "DIMENSION cstime '' absolute 1 %2$llu\n"
+                    "DIMENSION cgtime '' absolute 1 %2$llu\n"
+                    "DIMENSION cminflt '' absolute 1 %2$llu\n"
+                    "DIMENSION cmajflt '' absolute 1 %2$llu\n"
+                    , update_every
+                    , RATES_DETAIL
+            );
+#endif
+
+    }
+
+    fprintf(stdout,
+        "BEGIN netdata.apps_cpu %llu\n"
+        "SET user = %llu\n"
+        "SET system = %llu\n"
+        "END\n"
+        "BEGIN netdata.apps_sizes %llu\n"
+        "SET calls = %zu\n"
+        "SET files = %zu\n"
+        "SET filenames = %zu\n"
+        "SET inode_changes = %zu\n"
+        "SET link_changes = %zu\n"
+        "SET pids = %zu\n"
+        "SET fds = %d\n"
+        "SET targets = %zu\n"
+        "SET new_pids = %zu\n"
+        "END\n"
+        , dt
+        , cpuuser
+        , cpusyst
+        , dt
+        , calls_counter
+        , file_counter
+        , filenames_allocated_counter
+        , inodes_changed_counter
+        , links_changed_counter
+        , all_pids_count
+        , all_files_len
+        , apps_groups_targets_count
+        , targets_assignment_counter
+        );
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+    fprintf(stdout,
+            "BEGIN netdata.apps_fix %llu\n"
+            "SET utime = %u\n"
+            "SET stime = %u\n"
+            "SET gtime = %u\n"
+            "SET minflt = %u\n"
+            "SET majflt = %u\n"
+            "END\n"
+            , dt
+            , (unsigned int)(utime_fix_ratio   * 100 * RATES_DETAIL)
+            , (unsigned int)(stime_fix_ratio   * 100 * RATES_DETAIL)
+            , (unsigned int)(gtime_fix_ratio   * 100 * RATES_DETAIL)
+            , (unsigned int)(minflt_fix_ratio  * 100 * RATES_DETAIL)
+            , (unsigned int)(majflt_fix_ratio  * 100 * RATES_DETAIL)
+    );
+
+    if(include_exited_childs)
+        fprintf(stdout,
+            "BEGIN netdata.apps_children_fix %llu\n"
+            "SET cutime = %u\n"
+            "SET cstime = %u\n"
+            "SET cgtime = %u\n"
+            "SET cminflt = %u\n"
+            "SET cmajflt = %u\n"
+            "END\n"
+            , dt
+            , (unsigned int)(cutime_fix_ratio  * 100 * RATES_DETAIL)
+            , (unsigned int)(cstime_fix_ratio  * 100 * RATES_DETAIL)
+            , (unsigned int)(cgtime_fix_ratio  * 100 * RATES_DETAIL)
+            , (unsigned int)(cminflt_fix_ratio * 100 * RATES_DETAIL)
+            , (unsigned int)(cmajflt_fix_ratio * 100 * RATES_DETAIL)
+            );
+#endif
+}
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+static void normalize_utilization(struct target *root) {
+    struct target *w;
+
+    // childs processing introduces spikes
+    // here we try to eliminate them by disabling childs processing either for specific dimensions
+    // or entirely. Of course, either way, we disable it just a single iteration.
+
+    kernel_uint_t max_time = processors * system_hz * RATES_DETAIL;
+    kernel_uint_t utime = 0, cutime = 0, stime = 0, cstime = 0, gtime = 0, cgtime = 0, minflt = 0, cminflt = 0, majflt = 0, cmajflt = 0;
+
+    if(global_utime > max_time) global_utime = max_time;
+    if(global_stime > max_time) global_stime = max_time;
+    if(global_gtime > max_time) global_gtime = max_time;
+
+    for(w = root; w ; w = w->next) {
+        if(w->target || (!w->processes && !w->exposed)) continue;
+
+        utime   += w->utime;
+        stime   += w->stime;
+        gtime   += w->gtime;
+        cutime  += w->cutime;
+        cstime  += w->cstime;
+        cgtime  += w->cgtime;
+
+        minflt  += w->minflt;
+        majflt  += w->majflt;
+        cminflt += w->cminflt;
+        cmajflt += w->cmajflt;
+    }
+
+    if((global_utime || global_stime || global_gtime) && (utime || stime || gtime)) {
+        if(global_utime + global_stime + global_gtime > utime + cutime + stime + cstime + gtime + cgtime) {
+            // everything we collected fits
+            utime_fix_ratio  =
+            stime_fix_ratio  =
+            gtime_fix_ratio  =
+            cutime_fix_ratio =
+            cstime_fix_ratio =
+            cgtime_fix_ratio = 1.0; //(double)(global_utime + global_stime) / (double)(utime + cutime + stime + cstime);
+        }
+        else if(global_utime + global_stime > utime + stime) {
+            // childrens resources are too high
+            // lower only the children resources
+            utime_fix_ratio  =
+            stime_fix_ratio  =
+            gtime_fix_ratio  = 1.0;
+            cutime_fix_ratio =
+            cstime_fix_ratio =
+            cgtime_fix_ratio = (double)((global_utime + global_stime) - (utime + stime)) / (double)(cutime + cstime);
+        }
+        else {
+            // even running processes are unrealistic
+            // zero the children resources
+            // lower the running processes resources
+            utime_fix_ratio  =
+            stime_fix_ratio  =
+            gtime_fix_ratio  = (double)(global_utime + global_stime) / (double)(utime + stime);
+            cutime_fix_ratio =
+            cstime_fix_ratio =
+            cgtime_fix_ratio = 0.0;
+        }
+    }
+    else {
+        utime_fix_ratio  =
+        stime_fix_ratio  =
+        gtime_fix_ratio  =
+        cutime_fix_ratio =
+        cstime_fix_ratio =
+        cgtime_fix_ratio = 0.0;
+    }
+
+    if(utime_fix_ratio  > 1.0) utime_fix_ratio  = 1.0;
+    if(cutime_fix_ratio > 1.0) cutime_fix_ratio = 1.0;
+    if(stime_fix_ratio  > 1.0) stime_fix_ratio  = 1.0;
+    if(cstime_fix_ratio > 1.0) cstime_fix_ratio = 1.0;
+    if(gtime_fix_ratio  > 1.0) gtime_fix_ratio  = 1.0;
+    if(cgtime_fix_ratio > 1.0) cgtime_fix_ratio = 1.0;
+
+    // if(utime_fix_ratio  < 0.0) utime_fix_ratio  = 0.0;
+    // if(cutime_fix_ratio < 0.0) cutime_fix_ratio = 0.0;
+    // if(stime_fix_ratio  < 0.0) stime_fix_ratio  = 0.0;
+    // if(cstime_fix_ratio < 0.0) cstime_fix_ratio = 0.0;
+    // if(gtime_fix_ratio  < 0.0) gtime_fix_ratio  = 0.0;
+    // if(cgtime_fix_ratio < 0.0) cgtime_fix_ratio = 0.0;
+
+    // TODO
+    // we use cpu time to normalize page faults
+    // the problem is that to find the proper max values
+    // for page faults we have to parse /proc/vmstat
+    // which is quite big to do it again (netdata does it already)
+    //
+    // a better solution could be to somehow have netdata
+    // do this normalization for us
+
+    if(utime || stime || gtime)
+        majflt_fix_ratio =
+        minflt_fix_ratio = (double)(utime * utime_fix_ratio + stime * stime_fix_ratio + gtime * gtime_fix_ratio) / (double)(utime + stime + gtime);
+    else
+        minflt_fix_ratio =
+        majflt_fix_ratio = 1.0;
+
+    if(cutime || cstime || cgtime)
+        cmajflt_fix_ratio =
+        cminflt_fix_ratio = (double)(cutime * cutime_fix_ratio + cstime * cstime_fix_ratio + cgtime * cgtime_fix_ratio) / (double)(cutime + cstime + cgtime);
+    else
+        cminflt_fix_ratio =
+        cmajflt_fix_ratio = 1.0;
+
+    // the report
+
+    debug_log(
+            "SYSTEM: u=" KERNEL_UINT_FORMAT " s=" KERNEL_UINT_FORMAT " g=" KERNEL_UINT_FORMAT " "
+            "COLLECTED: u=" KERNEL_UINT_FORMAT " s=" KERNEL_UINT_FORMAT " g=" KERNEL_UINT_FORMAT " cu=" KERNEL_UINT_FORMAT " cs=" KERNEL_UINT_FORMAT " cg=" KERNEL_UINT_FORMAT " "
+            "DELTA: u=" KERNEL_UINT_FORMAT " s=" KERNEL_UINT_FORMAT " g=" KERNEL_UINT_FORMAT " "
+            "FIX: u=%0.2f s=%0.2f g=%0.2f cu=%0.2f cs=%0.2f cg=%0.2f "
+            "FINALLY: u=" KERNEL_UINT_FORMAT " s=" KERNEL_UINT_FORMAT " g=" KERNEL_UINT_FORMAT " cu=" KERNEL_UINT_FORMAT " cs=" KERNEL_UINT_FORMAT " cg=" KERNEL_UINT_FORMAT " "
+            , global_utime
+            , global_stime
+            , global_gtime
+            , utime
+            , stime
+            , gtime
+            , cutime
+            , cstime
+            , cgtime
+            , utime + cutime - global_utime
+            , stime + cstime - global_stime
+            , gtime + cgtime - global_gtime
+            , utime_fix_ratio
+            , stime_fix_ratio
+            , gtime_fix_ratio
+            , cutime_fix_ratio
+            , cstime_fix_ratio
+            , cgtime_fix_ratio
+            , (kernel_uint_t)(utime * utime_fix_ratio)
+            , (kernel_uint_t)(stime * stime_fix_ratio)
+            , (kernel_uint_t)(gtime * gtime_fix_ratio)
+            , (kernel_uint_t)(cutime * cutime_fix_ratio)
+            , (kernel_uint_t)(cstime * cstime_fix_ratio)
+            , (kernel_uint_t)(cgtime * cgtime_fix_ratio)
+    );
+}
+#else // ALL_PIDS_ARE_READ_INSTANTLY == 1
+static void normalize_utilization(struct target *root) {
+    (void)root;
+}
+#endif // ALL_PIDS_ARE_READ_INSTANTLY
+
+static void send_collected_data_to_netdata(struct target *root, const char *type, usec_t dt) {
+    struct target *w;
+
+    send_BEGIN(type, "cpu", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (kernel_uint_t)(w->utime * utime_fix_ratio) + (kernel_uint_t)(w->stime * stime_fix_ratio) + (kernel_uint_t)(w->gtime * gtime_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cutime * cutime_fix_ratio) + (kernel_uint_t)(w->cstime * cstime_fix_ratio) + (kernel_uint_t)(w->cgtime * cgtime_fix_ratio)):0ULL));
+    }
+    send_END();
+
+    send_BEGIN(type, "cpu_user", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (kernel_uint_t)(w->utime * utime_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cutime * cutime_fix_ratio)):0ULL));
+    }
+    send_END();
+
+    send_BEGIN(type, "cpu_system", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (kernel_uint_t)(w->stime * stime_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cstime * cstime_fix_ratio)):0ULL));
+    }
+    send_END();
+
+    if(show_guest_time) {
+        send_BEGIN(type, "cpu_guest", dt);
+        for (w = root; w ; w = w->next) {
+            if(unlikely(w->exposed))
+                send_SET(w->name, (kernel_uint_t)(w->gtime * gtime_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cgtime * cgtime_fix_ratio)):0ULL));
+        }
+        send_END();
+    }
+
+    send_BEGIN(type, "threads", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->num_threads);
+    }
+    send_END();
+
+    send_BEGIN(type, "processes", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->processes);
+    }
+    send_END();
+
+    send_BEGIN(type, "mem", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (w->status_vmrss > w->status_vmshared)?(w->status_vmrss - w->status_vmshared):0ULL);
+    }
+    send_END();
+
+    send_BEGIN(type, "vmem", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->status_vmsize);
+    }
+    send_END();
+
+#ifndef __FreeBSD__
+    send_BEGIN(type, "swap", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->status_vmswap);
+    }
+    send_END();
+#endif
+    
+    send_BEGIN(type, "minor_faults", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (kernel_uint_t)(w->minflt * minflt_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cminflt * cminflt_fix_ratio)):0ULL));
+    }
+    send_END();
+
+    send_BEGIN(type, "major_faults", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, (kernel_uint_t)(w->majflt * majflt_fix_ratio) + (include_exited_childs?((kernel_uint_t)(w->cmajflt * cmajflt_fix_ratio)):0ULL));
+    }
+    send_END();
+
+#ifndef __FreeBSD__
+    send_BEGIN(type, "lreads", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->io_logical_bytes_read);
+    }
+    send_END();
+
+    send_BEGIN(type, "lwrites", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->io_logical_bytes_written);
+    }
+    send_END();
+#endif
+
+    send_BEGIN(type, "preads", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->io_storage_bytes_read);
+    }
+    send_END();
+
+    send_BEGIN(type, "pwrites", dt);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            send_SET(w->name, w->io_storage_bytes_written);
+    }
+    send_END();
+
+    if(enable_file_charts) {
+        send_BEGIN(type, "files", dt);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                send_SET(w->name, w->openfiles);
+        }
+        send_END();
+
+        send_BEGIN(type, "sockets", dt);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                send_SET(w->name, w->opensockets);
+        }
+        send_END();
+
+        send_BEGIN(type, "pipes", dt);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                send_SET(w->name, w->openpipes);
+        }
+        send_END();
+    }
+}
+
+
+// ----------------------------------------------------------------------------
+// generate the charts
+
+static void send_charts_updates_to_netdata(struct target *root, const char *type, const char *title)
+{
+    struct target *w;
+    int newly_added = 0;
+
+    for(w = root ; w ; w = w->next) {
+        if (w->target) continue;
+
+        if (!w->exposed && w->processes) {
+            newly_added++;
+            w->exposed = 1;
+            if (debug_enabled || w->debug_enabled)
+                debug_log_int("%s just added - regenerating charts.", w->name);
+        }
+    }
+
+    // nothing more to show
+    if(!newly_added && show_guest_time == show_guest_time_old) return;
+
+    // we have something new to show
+    // update the charts
+    fprintf(stdout, "CHART %s.cpu '' '%s CPU Time (%d%% = %d core%s)' 'cpu time %%' cpu %s.cpu stacked 20001 %d\n", type, title, (processors * 100), processors, (processors>1)?"s":"", type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu %s\n", w->name, system_hz * RATES_DETAIL / 100, w->hidden ? "hidden" : "");
+    }
+
+    fprintf(stdout, "CHART %s.mem '' '%s Real Memory (w/o shared)' 'MB' mem %s.mem stacked 20003 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute %ld %ld\n", w->name, 1L, 1024L);
+    }
+
+    fprintf(stdout, "CHART %s.vmem '' '%s Virtual Memory Size' 'MB' mem %s.vmem stacked 20005 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute %ld %ld\n", w->name, 1L, 1024L);
+    }
+
+    fprintf(stdout, "CHART %s.threads '' '%s Threads' 'threads' processes %s.threads stacked 20006 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 1\n", w->name);
+    }
+
+    fprintf(stdout, "CHART %s.processes '' '%s Processes' 'processes' processes %s.processes stacked 20007 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 1\n", w->name);
+    }
+
+    fprintf(stdout, "CHART %s.cpu_user '' '%s CPU User Time (%d%% = %d core%s)' 'cpu time %%' cpu %s.cpu_user stacked 20020 %d\n", type, title, (processors * 100), processors, (processors>1)?"s":"", type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, system_hz * RATES_DETAIL / 100LLU);
+    }
+
+    fprintf(stdout, "CHART %s.cpu_system '' '%s CPU System Time (%d%% = %d core%s)' 'cpu time %%' cpu %s.cpu_system stacked 20021 %d\n", type, title, (processors * 100), processors, (processors>1)?"s":"", type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, system_hz * RATES_DETAIL / 100LLU);
+    }
+
+    if(show_guest_time) {
+        fprintf(stdout, "CHART %s.cpu_guest '' '%s CPU Guest Time (%d%% = %d core%s)' 'cpu time %%' cpu %s.cpu_system stacked 20022 %d\n", type, title, (processors * 100), processors, (processors > 1) ? "s" : "", type, update_every);
+        for (w = root; w; w = w->next) {
+            if(unlikely(w->exposed))
+                fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, system_hz * RATES_DETAIL / 100LLU);
+        }
+    }
+
+#ifndef __FreeBSD__
+    fprintf(stdout, "CHART %s.swap '' '%s Swap Memory' 'MB' swap %s.swap stacked 20011 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute %ld %ld\n", w->name, 1L, 1024L);
+    }
+#endif
+
+    fprintf(stdout, "CHART %s.major_faults '' '%s Major Page Faults (swap read)' 'page faults/s' swap %s.major_faults stacked 20012 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, RATES_DETAIL);
+    }
+
+    fprintf(stdout, "CHART %s.minor_faults '' '%s Minor Page Faults' 'page faults/s' mem %s.minor_faults stacked 20011 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, RATES_DETAIL);
+    }
+
+#ifdef __FreeBSD__
+    fprintf(stdout, "CHART %s.preads '' '%s Disk Reads' 'blocks/s' disk %s.preads stacked 20002 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, RATES_DETAIL);
+    }
+
+    fprintf(stdout, "CHART %s.pwrites '' '%s Disk Writes' 'blocks/s' disk %s.pwrites stacked 20002 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, RATES_DETAIL);
+    }
+#else
+    fprintf(stdout, "CHART %s.preads '' '%s Disk Reads' 'kilobytes/s' disk %s.preads stacked 20002 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, 1024LLU * RATES_DETAIL);
+    }
+
+    fprintf(stdout, "CHART %s.pwrites '' '%s Disk Writes' 'kilobytes/s' disk %s.pwrites stacked 20002 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, 1024LLU * RATES_DETAIL);
+    }
+
+    fprintf(stdout, "CHART %s.lreads '' '%s Disk Logical Reads' 'kilobytes/s' disk %s.lreads stacked 20042 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, 1024LLU * RATES_DETAIL);
+    }
+
+    fprintf(stdout, "CHART %s.lwrites '' '%s I/O Logical Writes' 'kilobytes/s' disk %s.lwrites stacked 20042 %d\n", type, title, type, update_every);
+    for (w = root; w ; w = w->next) {
+        if(unlikely(w->exposed))
+            fprintf(stdout, "DIMENSION %s '' absolute 1 %llu\n", w->name, 1024LLU * RATES_DETAIL);
+    }
+#endif
+
+    if(enable_file_charts) {
+        fprintf(stdout, "CHART %s.files '' '%s Open Files' 'open files' disk %s.files stacked 20050 %d\n", type,
+                       title, type, update_every);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                fprintf(stdout, "DIMENSION %s '' absolute 1 1\n", w->name);
+        }
+
+        fprintf(stdout, "CHART %s.sockets '' '%s Open Sockets' 'open sockets' net %s.sockets stacked 20051 %d\n",
+                       type, title, type, update_every);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                fprintf(stdout, "DIMENSION %s '' absolute 1 1\n", w->name);
+        }
+
+        fprintf(stdout, "CHART %s.pipes '' '%s Pipes' 'open pipes' processes %s.pipes stacked 20053 %d\n", type,
+                       title, type, update_every);
+        for (w = root; w; w = w->next) {
+            if (unlikely(w->exposed))
+                fprintf(stdout, "DIMENSION %s '' absolute 1 1\n", w->name);
+        }
+    }
+}
+
+
+// ----------------------------------------------------------------------------
+// parse command line arguments
+
+int check_proc_1_io() {
+    int ret = 0;
+
+    procfile *ff = procfile_open("/proc/1/io", NULL, PROCFILE_FLAG_NO_ERROR_ON_FILE_IO);
+    if(!ff) goto cleanup;
+
+    ff = procfile_readall(ff);
+    if(!ff) goto cleanup;
+
+    ret = 1;
+
+cleanup:
+    procfile_close(ff);
+    return ret;
+}
+
+static void parse_args(int argc, char **argv)
+{
+    int i, freq = 0;
+
+    for(i = 1; i < argc; i++) {
+        if(!freq) {
+            int n = (int)str2l(argv[i]);
+            if(n > 0) {
+                freq = n;
+                continue;
+            }
+        }
+
+        if(strcmp("version", argv[i]) == 0 || strcmp("-version", argv[i]) == 0 || strcmp("--version", argv[i]) == 0 || strcmp("-v", argv[i]) == 0 || strcmp("-V", argv[i]) == 0) {
+            printf("apps.plugin %s\n", VERSION);
+            exit(0);
+        }
+
+        if(strcmp("test-permissions", argv[i]) == 0 || strcmp("-t", argv[i]) == 0) {
+            if(!check_proc_1_io()) {
+                perror("Tried to read /proc/1/io and it failed");
+                exit(1);
+            }
+            printf("OK\n");
+            exit(0);
+        }
+
+        if(strcmp("debug", argv[i]) == 0) {
+#ifdef NETDATA_INTERNAL_CHECKS
+            debug_enabled = 1;
+#else
+            fprintf(stderr, "apps.plugin has been compiled without debugging\n");
+#endif
+            continue;
+        }
+
+#ifndef __FreeBSD__
+        if(strcmp("fds-cache-secs", argv[i]) == 0) {
+            if(argc <= i + 1) {
+                fprintf(stderr, "Parameter 'fds-cache-secs' requires a number as argument.\n");
+                exit(1);
+            }
+            i++;
+            max_fds_cache_seconds = str2i(argv[i]);
+            if(max_fds_cache_seconds < 0) max_fds_cache_seconds = 0;
+            continue;
+        }
+#endif
+
+        if(strcmp("no-childs", argv[i]) == 0 || strcmp("without-childs", argv[i]) == 0) {
+            include_exited_childs = 0;
+            continue;
+        }
+
+        if(strcmp("with-childs", argv[i]) == 0) {
+            include_exited_childs = 1;
+            continue;
+        }
+
+        if(strcmp("with-guest", argv[i]) == 0) {
+            enable_guest_charts = 1;
+            continue;
+        }
+
+        if(strcmp("no-guest", argv[i]) == 0 || strcmp("without-guest", argv[i]) == 0) {
+            enable_guest_charts = 0;
+            continue;
+        }
+
+        if(strcmp("with-files", argv[i]) == 0) {
+            enable_file_charts = 1;
+            continue;
+        }
+
+        if(strcmp("no-files", argv[i]) == 0 || strcmp("without-files", argv[i]) == 0) {
+            enable_file_charts = 0;
+            continue;
+        }
+
+        if(strcmp("no-users", argv[i]) == 0 || strcmp("without-users", argv[i]) == 0) {
+            enable_users_charts = 0;
+            continue;
+        }
+
+        if(strcmp("no-groups", argv[i]) == 0 || strcmp("without-groups", argv[i]) == 0) {
+            enable_groups_charts = 0;
+            continue;
+        }
+
+        if(strcmp("-h", argv[i]) == 0 || strcmp("--help", argv[i]) == 0) {
+            fprintf(stderr,
+                    "\n"
+                    " netdata apps.plugin %s\n"
+                    " Copyright (C) 2016-2017 Costa Tsaousis <costa@tsaousis.gr>\n"
+                    " Released under GNU General Public License v3 or later.\n"
+                    " All rights reserved.\n"
+                    "\n"
+                    " This program is a data collector plugin for netdata.\n"
+                    "\n"
+                    " Available command line options:\n"
+                    "\n"
+                    " SECONDS           set the data collection frequency\n"
+                    "\n"
+                    " debug             enable debugging (lot of output)\n"
+                    "\n"
+                    " with-childs\n"
+                    " without-childs    enable / disable aggregating exited\n"
+                    "                   children resources into parents\n"
+                    "                   (default is enabled)\n"
+                    "\n"
+                    " with-guest\n"
+                    " without-guest     enable / disable reporting guest charts\n"
+                    "                   (default is disabled)\n"
+                    "\n"
+                    " with-files\n"
+                    " without-files     enable / disable reporting files, sockets, pipes\n"
+                    "                   (default is enabled)\n"
+                    "\n"
+#ifndef __FreeBSD__
+                    " fds-cache-secs N  cache the files of processed for N seconds\n"
+                    "                   caching is adaptive per file (when a file\n"
+                    "                   is found, it starts at 0 and while the file\n"
+                    "                   remains open, it is incremented up to the\n"
+                    "                   max given)\n"
+                    "                   (default is %d seconds)\n"
+                    "\n"
+#endif
+                    " version or -v or -V print program version and exit\n"
+                    "\n"
+                    , VERSION
+#ifndef __FreeBSD__
+                    , max_fds_cache_seconds
+#endif
+            );
+            exit(1);
+        }
+
+        error("Cannot understand option %s", argv[i]);
+        exit(1);
+    }
+
+    if(freq > 0) update_every = freq;
+
+    if(read_apps_groups_conf(user_config_dir, "groups")) {
+        info("Cannot read process groups configuration file '%s/apps_groups.conf'. Will try '%s/apps_groups.conf'", user_config_dir, stock_config_dir);
+
+        if(read_apps_groups_conf(stock_config_dir, "groups")) {
+            error("Cannot read process groups '%s/apps_groups.conf'. There are no internal defaults. Failing.", stock_config_dir);
+            exit(1);
+        }
+        else
+            info("Loaded config file '%s/apps_groups.conf'", stock_config_dir);
+    }
+    else
+        info("Loaded config file '%s/apps_groups.conf'", user_config_dir);
+}
+
+static int am_i_running_as_root() {
+    uid_t uid = getuid(), euid = geteuid();
+
+    if(uid == 0 || euid == 0) {
+        if(debug_enabled) info("I am running with escalated privileges, uid = %u, euid = %u.", uid, euid);
+        return 1;
+    }
+
+    if(debug_enabled) info("I am not running with escalated privileges, uid = %u, euid = %u.", uid, euid);
+    return 0;
+}
+
+#ifdef HAVE_CAPABILITY
+static int check_capabilities() {
+    cap_t caps = cap_get_proc();
+    if(!caps) {
+        error("Cannot get current capabilities.");
+        return 0;
+    }
+    else if(debug_enabled)
+        info("Received my capabilities from the system.");
+
+    int ret = 1;
+
+    cap_flag_value_t cfv = CAP_CLEAR;
+    if(cap_get_flag(caps, CAP_DAC_READ_SEARCH, CAP_EFFECTIVE, &cfv) == -1) {
+        error("Cannot find if CAP_DAC_READ_SEARCH is effective.");
+        ret = 0;
+    }
+    else {
+        if(cfv != CAP_SET) {
+            error("apps.plugin should run with CAP_DAC_READ_SEARCH.");
+            ret = 0;
+        }
+        else if(debug_enabled)
+            info("apps.plugin runs with CAP_DAC_READ_SEARCH.");
+    }
+
+    cfv = CAP_CLEAR;
+    if(cap_get_flag(caps, CAP_SYS_PTRACE, CAP_EFFECTIVE, &cfv) == -1) {
+        error("Cannot find if CAP_SYS_PTRACE is effective.");
+        ret = 0;
+    }
+    else {
+        if(cfv != CAP_SET) {
+            error("apps.plugin should run with CAP_SYS_PTRACE.");
+            ret = 0;
+        }
+        else if(debug_enabled)
+            info("apps.plugin runs with CAP_SYS_PTRACE.");
+    }
+
+    cap_free(caps);
+
+    return ret;
+}
+#else
+static int check_capabilities() {
+    return 0;
+}
+#endif
+
+int main(int argc, char **argv) {
+    // debug_flags = D_PROCFILE;
+
+    pagesize = (size_t)sysconf(_SC_PAGESIZE);
+
+    // set the name for logging
+    program_name = "apps.plugin";
+
+    // disable syslog for apps.plugin
+    error_log_syslog = 0;
+
+    // set errors flood protection to 100 logs per hour
+    error_log_errors_per_period = 100;
+    error_log_throttle_period = 3600;
+
+    // since apps.plugin runs as root, prevent it from opening symbolic links
+    procfile_open_flags = O_RDONLY|O_NOFOLLOW;
+
+    netdata_configured_host_prefix = getenv("NETDATA_HOST_PREFIX");
+    if(verify_netdata_host_prefix() == -1) exit(1);
+
+    user_config_dir = getenv("NETDATA_USER_CONFIG_DIR");
+    if(user_config_dir == NULL) {
+        // info("NETDATA_CONFIG_DIR is not passed from netdata");
+        user_config_dir = CONFIG_DIR;
+    }
+    // else info("Found NETDATA_USER_CONFIG_DIR='%s'", user_config_dir);
+
+    stock_config_dir = getenv("NETDATA_STOCK_CONFIG_DIR");
+    if(stock_config_dir == NULL) {
+        // info("NETDATA_CONFIG_DIR is not passed from netdata");
+        stock_config_dir = LIBCONFIG_DIR;
+    }
+    // else info("Found NETDATA_USER_CONFIG_DIR='%s'", user_config_dir);
+
+#ifdef NETDATA_INTERNAL_CHECKS
+    if(debug_flags != 0) {
+        struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
+        if(setrlimit(RLIMIT_CORE, &rl) != 0)
+            info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
+#ifdef HAVE_SYS_PRCTL_H
+        prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
+#endif
+    }
+#endif /* NETDATA_INTERNAL_CHECKS */
+
+    procfile_adaptive_initial_allocation = 1;
+
+    time_t started_t = now_monotonic_sec();
+    get_system_HZ();
+    get_system_pid_max();
+    get_system_cpus();
+
+    parse_args(argc, argv);
+
+    if(!check_capabilities() && !am_i_running_as_root() && !check_proc_1_io()) {
+        uid_t uid = getuid(), euid = geteuid();
+#ifdef HAVE_CAPABILITY
+        error("apps.plugin should either run as root (now running with uid %u, euid %u) or have special capabilities. "
+                      "Without these, apps.plugin cannot report disk I/O utilization of other processes. "
+                      "To enable capabilities run: sudo setcap cap_dac_read_search,cap_sys_ptrace+ep %s; "
+                      "To enable setuid to root run: sudo chown root:netdata %s; sudo chmod 4750 %s; "
+              , uid, euid, argv[0], argv[0], argv[0]
+        );
+#else
+        error("apps.plugin should either run as root (now running with uid %u, euid %u) or have special capabilities. "
+                      "Without these, apps.plugin cannot report disk I/O utilization of other processes. "
+                      "Your system does not support capabilities. "
+                      "To enable setuid to root run: sudo chown root:netdata %s; sudo chmod 4750 %s; "
+              , uid, euid, argv[0], argv[0]
+        );
+#endif
+    }
+
+    info("started on pid %d", getpid());
+
+#if (ALL_PIDS_ARE_READ_INSTANTLY == 0)
+    all_pids_sortlist = callocz(sizeof(pid_t), (size_t)pid_max);
+#endif
+
+    all_pids          = callocz(sizeof(struct pid_stat *), (size_t) pid_max);
+
+    usec_t step = update_every * USEC_PER_SEC;
+    global_iterations_counter = 1;
+    heartbeat_t hb;
+    heartbeat_init(&hb);
+    for(;1; global_iterations_counter++) {
+
+#ifdef NETDATA_PROFILING
+#warning "compiling for profiling"
+        static int profiling_count=0;
+        profiling_count++;
+        if(unlikely(profiling_count > 2000)) exit(0);
+        usec_t dt = update_every * USEC_PER_SEC;
+#else
+        usec_t dt = heartbeat_next(&hb, step);
+#endif
+
+        if(!collect_data_for_all_processes()) {
+            error("Cannot collect /proc data for running processes. Disabling apps.plugin...");
+            printf("DISABLE\n");
+            exit(1);
+        }
+
+        calculate_netdata_statistics();
+        normalize_utilization(apps_groups_root_target);
+
+        send_resource_usage_to_netdata(dt);
+
+        // this is smart enough to show only newly added apps, when needed
+        send_charts_updates_to_netdata(apps_groups_root_target, "apps", "Apps");
+
+        if(likely(enable_users_charts))
+            send_charts_updates_to_netdata(users_root_target, "users", "Users");
+
+        if(likely(enable_groups_charts))
+            send_charts_updates_to_netdata(groups_root_target, "groups", "User Groups");
+
+        send_collected_data_to_netdata(apps_groups_root_target, "apps", dt);
+
+        if(likely(enable_users_charts))
+            send_collected_data_to_netdata(users_root_target, "users", dt);
+
+        if(likely(enable_groups_charts))
+            send_collected_data_to_netdata(groups_root_target, "groups", dt);
+
+        fflush(stdout);
+
+        show_guest_time_old = show_guest_time;
+
+        debug_log("done Loop No %zu", global_iterations_counter);
+
+        // restart check (14400 seconds)
+        if(now_monotonic_sec() - started_t > 14400) exit(0);
+    }
+}