gistfile1.rb

 # Taken from passenger_memory_stats script

  # Returns the private dirty RSS for the given process, in KB.
  def determine_private_dirty_rss(pid)
    total = 0
    File.read("/proc/#{pid}/smaps").split("\n").each do |line|
      line =~ /^(Private)_Dirty: +(\d+)/
      if $2
        total += $2.to_i
      end
    end
    if total == 0
      return nil
    else
      return total
    end
  rescue Errno::EACCES, Errno::ENOENT
    return nil
  end