src/proc_loadavg.c

   1 #include "common.h"
   2
   3 // linux calculates this once every 5 seconds
   4 #define MIN_LOADAVG_UPDATE_EVERY 5
   5
   6 int do_proc_loadavg(int update_every, usec_t dt) {
   7     static procfile *ff = NULL;
   8     static int do_loadavg = -1, do_all_processes = -1;
   9     static usec_t next_loadavg_dt = 0;
  10     static RRDSET *load_chart = NULL, *processes_chart = NULL;
  11
  12     if(unlikely(!ff)) {
  13         char filename[FILENAME_MAX + 1];
  14         snprintfz(filename, FILENAME_MAX, "%s%s", netdata_configured_host_prefix, "/proc/loadavg");
  15
  16         ff = procfile_open(config_get("plugin:proc:/proc/loadavg", "filename to monitor", filename), " \t,:|/", PROCFILE_FLAG_DEFAULT);
  17         if(unlikely(!ff))
  18             return 1;
  19     }
  20
  21     ff = procfile_readall(ff);
  22     if(unlikely(!ff))
  23         return 0; // we return 0, so that we will retry to open it next time
  24
  25     if(unlikely(do_loadavg == -1)) {
  26         do_loadavg          = config_get_boolean("plugin:proc:/proc/loadavg", "enable load average", 1);
  27         do_all_processes    = config_get_boolean("plugin:proc:/proc/loadavg", "enable total processes", 1);
  28     }
  29
  30     if(unlikely(procfile_lines(ff) < 1)) {
  31         error("/proc/loadavg has no lines.");
  32         return 1;
  33     }
  34     if(unlikely(procfile_linewords(ff, 0) < 6)) {
  35         error("/proc/loadavg has less than 6 words in it.");
  36         return 1;
  37     }
  38
  39     double load1 = strtod(procfile_lineword(ff, 0, 0), NULL);
  40     double load5 = strtod(procfile_lineword(ff, 0, 1), NULL);
  41     double load15 = strtod(procfile_lineword(ff, 0, 2), NULL);
  42
  43     //unsigned long long running_processes  = str2ull(procfile_lineword(ff, 0, 3));
  44     unsigned long long active_processes     = str2ull(procfile_lineword(ff, 0, 4));
  45     //unsigned long long next_pid           = str2ull(procfile_lineword(ff, 0, 5));
  46
  47
  48     // --------------------------------------------------------------------
  49
  50     if(next_loadavg_dt <= dt) {
  51         if(likely(do_loadavg)) {
  52             if(unlikely(!load_chart)) {
  53                 load_chart = rrdset_find_byname_localhost("system.load");
  54                 if(unlikely(!load_chart)) {
  55                     load_chart = rrdset_create("system", "load", NULL, "load", NULL, "System Load Average", "load", 100, (update_every < MIN_LOADAVG_UPDATE_EVERY) ? MIN_LOADAVG_UPDATE_EVERY : update_every, RRDSET_TYPE_LINE);
  56                     rrddim_add(load_chart, "load1", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
  57                     rrddim_add(load_chart, "load5", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
  58                     rrddim_add(load_chart, "load15", NULL, 1, 1000, RRD_ALGORITHM_ABSOLUTE);
  59                 }
  60             }
  61             else
  62                 rrdset_next(load_chart);
  63
  64             rrddim_set(load_chart, "load1", (collected_number) (load1 * 1000));
  65             rrddim_set(load_chart, "load5", (collected_number) (load5 * 1000));
  66             rrddim_set(load_chart, "load15", (collected_number) (load15 * 1000));
  67             rrdset_done(load_chart);
  68         }
  69
  70         next_loadavg_dt = load_chart->update_every * USEC_PER_SEC;
  71     }
  72     else next_loadavg_dt -= dt;
  73
  74     // --------------------------------------------------------------------
  75
  76     if(likely(do_all_processes)) {
  77         if(unlikely(!processes_chart)) {
  78             processes_chart = rrdset_find_byname_localhost("system.active_processes");
  79             if(unlikely(!processes_chart)) {
  80                 processes_chart = rrdset_create("system", "active_processes", NULL, "processes", NULL, "System Active Processes", "processes", 750, update_every, RRDSET_TYPE_LINE);
  81                 rrddim_add(processes_chart, "active", NULL, 1, 1, RRD_ALGORITHM_ABSOLUTE);
  82             }
  83         }
  84         else rrdset_next(processes_chart);
  85
  86         rrddim_set(processes_chart, "active", active_processes);
  87         rrdset_done(processes_chart);
  88     }
  89
  90     return 0;
  91 }