    # File lib/phusion_passenger/admin_tools/memory_stats.rb, line 49
                    def private_dirty_rss_in_mb
                            if private_dirty_rss.is_a?(Numeric)
                                    return sprintf("%.1f MB", private_dirty_rss / 1024.0)
                            else
                                    return "?"
                            end
                    end