#! /bin/sh
#
# Copyright (c) 2014 Wind River Systems, Inc.
#
# SPDX-License-Identifier: Apache-2.0
#

#
# chkconfig: 2345 95 95
#
### BEGIN INIT INFO
# Provides:          scheduler ftrace
# Default-Start:     3 5
# Default-Stop:      0 1 2 6
# Short-Description: Start stop scheduler trace on cpu0 
### END INIT INFO

PATH=/sbin:/usr/sbin:/bin:/usr/bin:/usr/local/bin
export PATH


case "$1" in
    start)
        # Seems to default to enabled already, but enable it anyway.
        echo 1 > /proc/sys/kernel/ftrace_enabled

        cd /sys/kernel/debug/tracing

        # This file doesn't exist in newer kernels.
        echo 1 > tracing_enabled

        # Enable the nop tracer.
        echo nop > current_tracer

        # Enable the ones we want.
        echo "sched_switch sched_wakeup sched_wakeup_new" >> set_event

        # Limit tracing to cpu0
        echo 1 > tracing_cpumask

        # Enable tracing
        echo 1 > tracing_on
        ;;

    stop)
        # Disable tracing
        echo 0 > tracing_on

        ;;

    *)
        echo "usage: $0 { start | stop }"
        ;;
esac