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

NAME
probe::scheduler.wait_task - Waiting on a task to unschedule (become inactive)
SYNOPSIS
scheduler.wait_task
VALUES
task_pid
PID of the task the scheduler is waiting on
name
name of the probe point
task_priority
priority of the task
SystemTap Tapset Reference March 2016 PROBE::SCHEDULER.W(3stap)