#!/bin/sh
# SPDX-License-Identifier: GPL-2.0
# 
# Author: Steve Sistare <steven.sistare@oracle.com>
#
# Usage: feat [feature1] [feature2] ...
#   Enable/disable one or more sched_features.
#   With no arguments, print the currently enabled features.

if [[ ! -r /sys/kernel/debug ]]; then
        echo "Permission denied. You must be root."
        exit 1
elif [[ ! -r /sys/kernel/debug/sched_features ]]; then
        echo "debugfs not mounted.  Please run as root:"
        echo "    mount -t debugfs none /sys/kernel/debug"
        exit 1
fi

if [ $# == 0 ] ; then
        cat /sys/kernel/debug/sched_features | sed 's/ /\n/g'
else
        for feat in $* ; do
                if ! echo $feat > /sys/kernel/debug/sched_features ; then
                        echo Unrecognized feature $feat
                fi
        done
fi

exit 0