Display a list of all the processes listed by their autogroup (CONFIG_SCHED_AUTOGROUP)

autogroups

#!/usr/bin/env ruby

$autogroups = Hash.new { |h,k| h[k] = [] }

Dir.glob('/proc/*').each do |e|
  pid = File.basename(e).to_i
  next if pid == 0
  begin
    cmdline = File.read(e + '/cmdline').split("\0").join(" ")
    next if cmdline.empty?
    if File.read(e + '/autogroup') =~ %r{^/autogroup-(\d+)}
      autogroup = $1.to_i
    else
      autogroup = nil
    end
    $autogroups[autogroup] << [pid, cmdline]
  rescue Errno::ENOENT
    next
  end
end

$autogroups.values.each do |e|
  puts '-' * 80
  e.each { |cmd| puts "%s\t%s" % cmd }
end
puts '-' * 80