Provided by: systemtap-doc_2.3-1ubuntu1_all bug

NAME

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

SYNOPSIS

       ioscheduler_trace.plug

VALUES

       name
           Name of the probe point

       rq_queue
           request queue

DESCRIPTION

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