Linux KSM Init Script

control_ksm.sh

#!/bin/sh
#
# Author:           Marin Atanasov Nikolov <[email protected]>
# http://dnaeon.github.io/enable-ksm-during-boot-time-on-linux/
# 
### BEGIN INIT INFO
# Provides:          ksm
# Required-Start:    
# Required-Stop:
# X-Start-Before:    
# Default-Start:     2 3 4 5
# Default-Stop:      0 1 6 
# Short-Description: Enable and disable KVM KSM
# Description:       Enables and disables the KVM  Kernel Samepage Merging
#                    feature of the kernel
### END INIT INFO

set -e
. /lib/lsb/init-functions

do_start() {
	echo 1 > /sys/kernel/mm/ksm/run
	log_success_msg "Enabling Kernel Samepage Merging"
}
 
do_stop() {
	echo 0 > /sys/kernel/mm/ksm/run
	log_success_msg "Disabling Kernel Samepage Merging"
}
		
do_status() {
	local ksm_status
	ksm_status=$( cat /sys/kernel/mm/ksm/run )

	if [ ${ksm_status} -eq 1 ]; then
		log_success_msg "Kernel Samepage Merging is enabled"
	else
		log_success_msg "Kernel Samepage Merging is disabled"
	fi
}

case "${1}" in
	start)
		do_start
		;;
	reset|stop)
		do_stop
		;;
	status)
		do_status
		;;
	reload|restart|force-reload)
		do_stop
		do_start
		;;
	*)
		log_success_msg "usage: ${0} {start|stop|status|reload|restart|force-reload|reset}" >&2
		;;
esac