gistfile1.rb

module Bluepill
  module ProcessConditions
    class ProcMemUsage < MemUsage
      def run(pid)
        begin
          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
      end
    end
  end
end