title: Track Time Processes Spend in Various States Using Tracepoints
name: schedtimes.stp
version: 1.0
author: Jason Baron
keywords: process scheduler time tracepoint
subsystem: scheduler
status: production
exit: user-controlled
output: sorted-list
scope: system-wide
description: The schedtimes.stp script instruments the scheduler to track the amount of time that each process spends in running, sleeping, queuing, and waiting for io. On exit the script prints out the accumulated time for each state of processes observed.  Optionally, this script can be used with the '-c' or '-x' options to focus on a specific PID.
test_support: stap -l 'kernel.trace("sched_switch")' && stap -l 'kernel.trace("sched_wakeup")'
test_check: stap -p4 schedtimes.stp
test_installcheck: stap schedtimes.stp -c "sleep 0.2"