contrib/statusd/statusd_cpufreq.lua

   1 -- Authors: Unknown
   2 -- License: Public domain
   3 -- Last Changed: Unknown
   4 --
   5 -- statusd_cpufreq.lua
   6 --
   7 -- Public domain
   8 --
   9 -- Use the key "cpufreq_[KMG]" to get the current CPU frequency in
  10 -- K/M/GHz, according to /sys/devices/system/cpu/cpuX/cpufreq/.  (This
  11 -- has the advantage of being a much "rounder" number than the one in
  12 -- /proc/cpuinfo, as provided by statusd_cpuspeed.lua.)
  13 --
  14 -- The "cpu" option to the statusd settings for cpufreq modifies which
  15 -- cpu we look at.
  16
  17 local defaults={ update_interval=2*1000, cpu=0 }
  18 local settings=table.join(statusd.get_config("cpufreq"), defaults)
  19
  20 function get_cpufreq()
  21         local f=io.open('/sys/devices/system/cpu/cpu'.. settings.cpu ..'/cpufreq/scaling_cur_freq')
  22         local cpufreq_K = f:read('*a')
  23         f:close()
  24
  25         local cpufreq_M = cpufreq_K / 1000
  26         local cpufreq_G = cpufreq_M / 1000
  27
  28         return tostring(cpufreq_K), tostring(cpufreq_M), tostring(cpufreq_G)
  29 end
  30
  31 function update_cpufreq()
  32         local cpufreq_K, cpufreq_M, cpufreq_G = get_cpufreq()
  33         statusd.inform("cpufreq_K", cpufreq_K)
  34         statusd.inform("cpufreq_M", cpufreq_M)
  35         statusd.inform("cpufreq_G", cpufreq_G)
  36         cpufreq_timer:set(settings.update_interval, update_cpufreq)
  37 end
  38
  39 cpufreq_timer = statusd.create_timer()
  40 update_cpufreq()