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
  12     if(unlikely(!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(unlikely(!ff))
  18         return 1;
  19
  20     ff = procfile_readall(ff);
  21     if(unlikely(!ff))
  22         return 0; // we return 0, so that we will retry to open it next time
  23
  24     if(unlikely(do_loadavg == -1))        do_loadavg          = config_get_boolean("plugin:proc:/proc/loadavg", "enable load average", 1);
  25     if(unlikely(do_all_processes == -1))  do_all_processes    = config_get_boolean("plugin:proc:/proc/loadavg", "enable total processes", 1);
  26
  27     if(unlikely(procfile_lines(ff) < 1)) {
  28         error("/proc/loadavg has no lines.");
  29         return 1;
  30     }
  31     if(unlikely(procfile_linewords(ff, 0) < 6)) {
  32         error("/proc/loadavg has less than 6 words in it.");
  33         return 1;
  34     }
  35
  36     double load1 = strtod(procfile_lineword(ff, 0, 0), NULL);
  37     double load5 = strtod(procfile_lineword(ff, 0, 1), NULL);
  38     double load15 = strtod(procfile_lineword(ff, 0, 2), NULL);
  39
  40     //unsigned long long running_processes  = strtoull(procfile_lineword(ff, 0, 3), NULL, 10);
  41     unsigned long long active_processes     = strtoull(procfile_lineword(ff, 0, 4), NULL, 10);
  42     //unsigned long long next_pid               = strtoull(procfile_lineword(ff, 0, 5), NULL, 10);
  43
  44
  45     RRDSET *st;
  46
  47     // --------------------------------------------------------------------
  48
  49     if(likely(do_loadavg)) {
  50         st = rrdset_find_byname("system.load");
  51         if(unlikely(!st)) {
  52             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);
  53
  54             rrddim_add(st, "load1", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  55             rrddim_add(st, "load5", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  56             rrddim_add(st, "load15", NULL, 1, 1000, RRDDIM_ABSOLUTE);
  57         }
  58         else rrdset_next(st);
  59
  60         rrddim_set(st, "load1", (collected_number)(load1 * 1000));
  61         rrddim_set(st, "load5", (collected_number)(load5 * 1000));
  62         rrddim_set(st, "load15", (collected_number)(load15 * 1000));
  63         rrdset_done(st);
  64     }
  65
  66     // --------------------------------------------------------------------
  67
  68     if(likely(do_all_processes)) {
  69         st = rrdset_find_byname("system.active_processes");
  70         if(unlikely(!st)) {
  71             st = rrdset_create("system", "active_processes", NULL, "processes", NULL, "System Active Processes", "processes", 750, update_every, RRDSET_TYPE_LINE);
  72
  73             rrddim_add(st, "active", NULL, 1, 1, RRDDIM_ABSOLUTE);
  74         }
  75         else rrdset_next(st);
  76
  77         rrddim_set(st, "active", active_processes);
  78         rrdset_done(st);
  79     }
  80
  81     return 0;
  82 }