Provided by: systemtap-doc_5.0-2ubuntu1_amd64 

NAME
probe::ioscheduler_trace.unplug_io - Fires when a request queue is unplugged;
SYNOPSIS
ioscheduler_trace.unplug_io
VALUES
name Name of the probe point rq_queue request queue
DESCRIPTION
Either, when number of pending requests in the queue exceeds threshold or, upon expiration of timer that was activated when queue was plugged.
SEE ALSO
tapset::ioscheduler(3stap)