dd-27058 [000] 24561.155144: funcgraph_entry:        2.976 us  |  lo_open();
 kworker/0:1H-213   [000] 24561.155252: funcgraph_entry:  +    11.023 us  |  loop_queue_rq();
        loop0-26894 [000] 24561.155273: funcgraph_entry:                  |    loop_queue_work() {
        loop0-26894 [000] 24561.155273: funcgraph_entry:                  |      loop_handle_cmd() {
        loop0-26894 [000] 24561.155273: funcgraph_entry:                  |        do_req_filebacked() {
        loop0-26894 [000] 24561.155274: funcgraph_entry:        7.457 us  |          lo_read_simple();
        loop0-26894 [000] 24561.155281: funcgraph_exit:         7.969 us  |        }
        loop0-26894 [000] 24561.155287: funcgraph_exit:   +    14.226 us  |      }
        loop0-26894 [000] 24561.155287: funcgraph_exit:   +    14.784 us  |    }
  ksoftirqd/0-9     [000] 24561.155296: funcgraph_entry:  +    14.422 us  |  lo_complete_rq();
           dd-27058 [000] 24561.155414: funcgraph_entry:        8.161 us  |  loop_queue_rq();
        loop0-26894 [000] 24561.155429: funcgraph_entry:                  |    loop_queue_work() {
        loop0-26894 [000] 24561.155429: funcgraph_entry:                  |      loop_handle_cmd() {
        loop0-26894 [000] 24561.155430: funcgraph_entry:                  |        do_req_filebacked() {
        loop0-26894 [000] 24561.155430: funcgraph_entry:                  |          lo_write_simple() {
        loop0-26894 [000] 24561.155430: funcgraph_entry:  +    54.236 us  |            lo_write_bvec();
        loop0-26894 [000] 24561.155485: funcgraph_exit:   +    54.952 us  |          }
        loop0-26894 [000] 24561.155485: funcgraph_exit:   +    55.403 us  |        }
        loop0-26894 [000] 24561.155490: funcgraph_exit:   +    60.666 us  |      }
        loop0-26894 [000] 24561.155490: funcgraph_exit:   +    61.088 us  |    }
  ksoftirqd/0-9     [000] 24561.155743: funcgraph_entry:  +    19.316 us  |  lo_complete_rq();
           dd-27058 [000] 24561.155828: funcgraph_entry:  # 34575.481 us  |  lo_release();
systemd-udevd-267   [001] 24561.190463: funcgraph_entry:        2.223 us  |  lo_open();
systemd-udevd-267   [001] 24561.190505: funcgraph_entry:                  |  lo_release() {