Provided by: systemtap-doc_2.3-1ubuntu1.4_all bug

NAME
       probe::ioscheduler_trace.plug - Fires when a request queue is plugged;


SYNOPSIS
       ioscheduler_trace.plug


VALUES
       rq_queue
           request queue

       name
           Name of the probe point


DESCRIPTION
       ie, requests in the queue cannot be serviced by block driver.