rc.controllers.in

#! /bin/sh
#
# rc.S mounts all cgroups controllers in the V1 hierarchy
#
# I am rude: I will move them to the V2 hierarchy

prefix="@prefix@"
exec_prefix="@exec_prefix@"
sysconfdir="@sysconfdir@"

if test ! -f "@CONFIGDIR@/cgroup.controllers"
then
    exit 0
fi

. @CONFIGDIR@/cgroup.controllers

v2controllers=""
v1controllers=""

for c in $controllers
do
    v2="`echo $c | cut -d= -f1`"
    v1="`echo $c | cut -d= -f2`"
    v2controllers="$v2controllers $v2"

    if test "$v1" = ""
    then
	v1="$v2"
    fi

    if test -d /sys/fs/cgroup/$v1
    then
	v1controllers="$v1controllers $v1"

	if umount /sys/fs/cgroup/$v1
	then
	    rmdir /sys/fs/cgroup/$v1
	else
	    echo "Cannot turn off $v1 controller in cgroups version 1" >&2
	fi
    fi
done

# It seems that after unmounting the controller isn't immediately available
# for V2. We need to introduce an artificial delay.

if test "$v1controllers" != ""
then
    echo "Stopped the following cgroups 1 controllers:$v1controllers"
    sleep 2
fi

for c in $v2controllers
do
    if echo "+$c" >/sys/fs/cgroup/vera/cgroup.subtree_control 2>/dev/null
    then
	echo "$c controller enabled"
    else
	echo "Cannot enable the $c controller" >&2
    fi
done