# :Author: Hector Rivas Gandara # # Based on comments in # - http://www.webupd8.org/2010/11/alternative-to-200-lines-kernel-patch.html # - http://lkml.org/lkml/2010/11/16/330 # # This script enables the Lennart Poettering cgroup alternative to #

cgroup-ctl.sh

#!/bin/sh
# 
# cgroup-ctl.sh
#
# :Author: Hector Rivas Gandara
#
# Based on comments in 
# - http://www.webupd8.org/2010/11/alternative-to-200-lines-kernel-patch.html
# - http://lkml.org/lkml/2010/11/16/330
#
# This script enables the Lennart Poettering cgroup alternative to 
# increase desktop responsiness.
# 
# Copy it to /usr/local/bin.
# You can add it to your rc.local (as root)
#
# echo "/usr/local/bin/cgroup-ctl.sh init" >> /etc/rc.local
# chmod +x /etc/rc.local
#
# You can add it to your bashrc for interactive console sessions or 
# to the /etc/rc.local to use it globally
#
# 


REAL_SCRIPT_PATH=$(cd $(dirname $0); pwd)/$(basename $0)

# Change as needed. It is said that Ubuntu uses /dev (unconfirmed by me)
CGROUP_CPU_PATH=/dev/cgroup/cpu
#CGROUP_CPU_PATH=/sys/fs/cgroup/cpu

print_help() {
	cat <<EOF
Usage: 
  $0 (setup|release|init [pid]) 
  
setup:	 Initializes cgroup. 
release: Called to release the resource.
init:	 Called to enable it for actual process or to given pid
EOF
}


case $1 in
	setup)
		mkdir -p $CGROUP_CPU_PATH 
		mount -t cgroup cgroup $CGROUP_CPU_PATH -o cpu 
		mkdir -p -m 0777 $CGROUP_CPU_PATH/user 
		echo "1" > $CGROUP_CPU_PATH/user/notify_on_release 
		echo "$REAL_SCRIPT_PATH release" > $CGROUP_CPU_PATH/release_agent
	;;
	release)
		rm -rf $CGROUP_CPU_PATH/$1
	;;
	init)
		[ ! -z "$2" ] && PID=$2 || PID=$(ps -H h -o ppid -p $$ | tr -d ' ')
		if ! ps -p $PID > /dev/null; then
			echo "$0: Pid $PID not found" 1>&2
			exit 1	
		fi
		mkdir -m 0700 /dev/cgroup/cpu/user/$PID && \
		echo $$ > /dev/cgroup/cpu/user/$PID/tasks
	;;
	*)
		print_help
	;;
esac