    # File lib/phusion_passenger/admin_tools/memory_stats.rb, line 64
            def apache_processes
                    @apache_processes ||= begin
                            if PlatformInfo.httpd
                                    processes = list_processes(:exe => PlatformInfo.httpd)
                                    if processes.empty?
                                            # On some Linux distros, the Apache worker processes
                                            # are called "httpd.worker"
                                            processes = list_processes(:exe => "#{PlatformInfo.httpd}.worker")
                                    end
                                    processes
                            else
                                    nil
                            end
                    end
            end