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