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#!/usr/bin/ruby
# Copyright (c) 2006 Peter Palfrader
#
#%# family=auto
#%# capabilities=autoconf
def bail_out(m)
STDERR.puts "#{$0}: #{m}"
exit 1
end
def autoconf
if FileTest.directory? "/sys/devices/system/cpu/cpu0/cpufreq/"
puts "yes"
else
puts "no (no /sys/devices/system/cpu/cpu0/cpufreq/)"
end
end
def findmasters
cpudirs = Dir.glob("/sys/devices/system/cpu/cpu*/").map{ |b| File.basename b }
cpus = cpudirs.map{ |d| /^cpu([0-9]+)$/.match(d)[1].to_i }.sort{|a,b| a<=>b }
masters = []
cpus.each do |cpunum|
affected = IO.read("/sys/devices/system/cpu/cpu#{cpunum}/cpufreq/affected_cpus").split.map{|s| s.to_i}.sort{|a,b| a<=>b }
bail_out "huh? /sys/devices/system/cpu/cpu#{cpunum}/cpufreq/affected_cpus says it does not affect #{cpunum}!?" unless affected.include? cpunum
h = {}
h['cpunum'] = affected[0]
h['fieldname'] = "cpu#{affected[0]}"
h['label'] = affected.map{|c| "cpu#{c}"}.join(", ")
h['max'] = IO.read("/sys/devices/system/cpu/cpu#{cpunum}/cpufreq/cpuinfo_max_freq").to_i
masters.push(h)
affected.each{ |a| cpus.delete(a) }
end
masters
end
def config
m = findmasters
max = m.map{ |i| i['max'] }.max
puts 'graph_title CPU frequency'
puts "graph_args -l 0 -u #{max * 1000} --base 1000"
puts 'graph_vlabel Hz'
puts 'graph_category system'
puts 'graph_period second'
puts 'graph_info Shows the CPU frequency of all installed CPUs'
m.each do |m|
puts "#{m['fieldname']}.label #{m['label']}"
puts "#{m['fieldname']}.cdef #{m['fieldname']},1000,*"
puts "#{m['fieldname']}.info Hz"
puts "#{m['fieldname']}.type GAUGE"
end
end
def report
m = findmasters
sleep(5) # we are interested how it does without us poking it,
# so maybe sleeping a bit will help
m.each do |m|
# value = IO.read("/sys/devices/system/cpu/cpu#{m['cpunum']}/cpufreq/cpuinfo_cur_freq").to_i
# cpuinfo_cur_freq is not readable
value = IO.read("/sys/devices/system/cpu/cpu#{m['cpunum']}/cpufreq/scaling_cur_freq").to_i
puts "#{m['fieldname']}.value #{value}"
end
end
case ARGV[0]
when "autoconf"
autoconf
when "config"
config
else
report
end
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