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, unsigned long long dt) {
   7     (void)dt;
   8
   9     static procfile *ff = NULL;
  10     static int do_loadavg = -1, do_all_processes = -1;
  11     static unsigned long long last_loadavg_usec = 0;
  12     static RRDSET *load_chart = NULL, *processes_chart = NULL;
  13
  14     if(unlikely(!ff)) {
  15         char filename[FILENAME_MAX + 1];
  16         snprintfz(filename, FILENAME_MAX, "%s%s", global_host_prefix, "/proc/loadavg");
  17         ff = procfile_open(config_get("plugin:proc:/proc/loadavg", "filename to monitor", filename), " \t,:|/", PROCFILE_FLAG_DEFAULT);
  18     }
  19     if(unlikely(!ff))
  20         return 1;
  21
  22     ff = procfile_readall(ff);
  23     if(unlikely(!ff))
  24         return 0; // we return 0, so that we will retry to open it next time
  25
  26     if(unlikely(do_loadavg == -1)) {
  27         do_loadavg          = config_get_boolean("plugin:proc:/proc/loadavg", "enable load average", 1);
  28         do_all_processes    = config_get_boolean("plugin:proc:/proc/loadavg", "enable total processes", 1);
  29     }
  30
  31     if(unlikely(procfile_lines(ff) < 1)) {
  32         error("/proc/loadavg has no lines.");
  33         return 1;
  34     }
  35     if(unlikely(procfile_linewords(ff, 0) < 6)) {
  36         error("/proc/loadavg has less than 6 words in it.");
  37         return 1;
  38     }
  39
  40     double load1 = strtod(procfile_lineword(ff, 0, 0), NULL);
  41     double load5 = strtod(procfile_lineword(ff, 0, 1), NULL);
  42     double load15 = strtod(procfile_lineword(ff, 0, 2), NULL);
  43
  44     //unsigned long long running_processes  = strtoull(procfile_lineword(ff, 0, 3), NULL, 10);
  45     unsigned long long active_processes     = strtoull(procfile_lineword(ff, 0, 4), NULL, 10);
  46     //unsigned long long next_pid           = strtoull(procfile_lineword(ff, 0, 5), NULL, 10);
  47
  48
  49     // --------------------------------------------------------------------
  50
  51     if(last_loadavg_usec <= dt) {
  52         if(likely(do_loadavg)) {
  53             if(unlikely(!load_chart)) {
  54                 load_chart = rrdset_find_byname("system.load");
  55                 if(unlikely(!load_chart)) {
  56                     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);
  57                     rrddim_add(load_chart, "load1", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  58                     rrddim_add(load_chart, "load5", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  59                     rrddim_add(load_chart, "load15", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  60                 }
  61             }
  62             else
  63                 rrdset_next(load_chart);
  64
  65             rrddim_set(load_chart, "load1", (collected_number) (load1 * 1000));
  66             rrddim_set(load_chart, "load5", (collected_number) (load5 * 1000));
  67             rrddim_set(load_chart, "load15", (collected_number) (load15 * 1000));
  68             rrdset_done(load_chart);
  69         }
  70
  71         last_loadavg_usec = load_chart->update_every * 1000000ULL;
  72     }
  73     else last_loadavg_usec -= dt;
  74
  75     // --------------------------------------------------------------------
  76
  77     if(likely(do_all_processes)) {
  78         if(unlikely(!processes_chart)) {
  79             processes_chart = rrdset_find_byname("system.active_processes");
  80             if(unlikely(!processes_chart)) {
  81                 processes_chart = rrdset_create("system", "active_processes", NULL, "processes", NULL, "System Active Processes", "processes", 750, update_every, RRDSET_TYPE_LINE);
  82                 rrddim_add(processes_chart, "active", NULL, 1, 1, RRDDIM_ABSOLUTE);
  83             }
  84         }
  85         else rrdset_next(processes_chart);
  86
  87         rrddim_set(processes_chart, "active", active_processes);
  88         rrdset_done(processes_chart);
  89     }
  90
  91     return 0;
  92 }