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File compcache of Package compcache

#!/bin/sh
#
# System startup script loading compcache kernel module
# Copyright (C) 2008 Takashi Iwai <tiwai@suse.de>
# Added SMP support by Erdem U. Altinyurt <spamjunkeater@gmail.com>
#
# /etc/init.d/compcache
#   and its symbolic link
# /usr/sbin/rccompcache
#
### BEGIN INIT INFO
# Provides:         boot.compcache
# Required-Start:   $null
# Required-Stop:    $null
# Should-Start:     $null
# Should-Stop       $null
# Default-Start:    3 5
# Default-Stop:     0 6
# Description:      Loads compcache - compressed RAM based swap device
### END INIT INFO

. /etc/rc.status
. /etc/sysconfig/compcache

SWAPON_BIN=/sbin/swapon
SWAPOFF_BIN=/sbin/swapoff
UDEVADM_BIN=/sbin/udevadm
MODPROBE_BIN=/sbin/modprobe
ZRAM=zram
SWAPDEVNM=/dev/zram
NUM_DEV="num_devices"
COMP_ALGO="lz4"
test -z "$COMPCACHE_NUM_DEVICES" -o "$COMPCACHE_NUM_DEVICES" -le 0 && COMPCACHE_NUM_DEVICES=$(cat /proc/cpuinfo | grep processor | wc -l)
test -z "$COMPCACHE_SIZE_KB" && COMPCACHE_SIZE_KB="0"
test -z "$COMPCACHE_COMP_ALGORITHM" && COMPCACHE_COMP_ALGORITHM="$COMP_ALGO"

is_comp_swap_on () {
    grep -q $1 /proc/swaps
    return $?
}

get_memsize_in_kb () {
    grep MemTotal /proc/meminfo | sed 's/^.*  //;s/ .*$//g'
}

rc_reset

case "$1" in
    start)
	#echo "Activating compressed RAM swap-devices..."
	if [ "$COMPCACHE_SIZE_KB" -lt 0 ]; then
	    echo -n "Loading $ZRAM driver with $COMPCACHE_NUM_DEVICES devices "
	    rc_status -u
	else
		if [ "$COMPCACHE_SIZE_KB" -eq 0 ]; then
		# 25% of RAM
		COMPCACHE_SIZE_KB=$(expr $(get_memsize_in_kb) / 4)
	    fi
	    if [ "$COMPCACHE_SIZE_KB" -lt 1024 ]; then
		COMPCACHE_SIZE_STR="$COMPCACHE_SIZE_KB kB"
	    else
		COMPCACHE_SIZE_STR="$(expr $COMPCACHE_SIZE_KB / 1024) MB"
	    fi
	    echo -n "Loading $ZRAM driver with $COMPCACHE_NUM_DEVICES devices and $COMPCACHE_SIZE_STR memory "
	    $MODPROBE_BIN -q $ZRAM $NUM_DEV=$COMPCACHE_NUM_DEVICES &> /dev/null
	    rc_status -v
	    # /dev/ramzswap0 is not available immediately after insmod returns
	    # So, let udev complete its work before we do swapon
	    if [ ! -f ${SWAPDEVNM}0 ]; then
		if [ -x "$UDEVADM_BIN" ]; then
		    $UDEVADM_BIN settle
		else
		    sleep 2
		fi
	    fi

COMPCACHE_DEV_SIZE_KB=$(expr $COMPCACHE_SIZE_KB / $COMPCACHE_NUM_DEVICES)
	    for i in $(seq 0 $(expr $COMPCACHE_NUM_DEVICES - 1) ); do
		SWAPDEV=$SWAPDEVNM$i
		SIZEBLK=/sys/block/$ZRAM$i/disksize
        COMPBLK=/sys/block/$ZRAM$i/comp_algorithm
        echo $COMPCACHE_COMP_ALGORITHM > $COMPBLK
		echo $(( $COMPCACHE_DEV_SIZE_KB * 1024 )) > $SIZEBLK
		if ! is_comp_swap_on $SWAPDEV; then
		    echo -n "Setting up $ZRAM swap device $i "
		    test "$ZRAM" = "zram" && /sbin/mkswap $SWAPDEV
		    $SWAPON_BIN $SWAPDEV -p 10
		    rc_status -v
		fi
	    done
	fi
	;;
    stop)
	#echo "Turning off compressed RAM swap-devices"
	# We can't use COMPCACHE_NUM_DEVICES to enumerate, because the user can
	# start compcache, lower COMPCACHE_NUM_DEVICES and restart compcache.
	for SWAPDEV in ${SWAPDEVNM}* ; do
	    if is_comp_swap_on $SWAPDEV; then
		nm=${SWAPDEV#$SWAPDEVNM}
		RESETBLK=/sys/block/$ZRAM$nm/reset
		echo -n "Turning off $ZRAM swap device $nm "
		$SWAPOFF_BIN $SWAPDEV
		rc_check
		echo 1 > $RESETBLK
		rc_status -v
	    fi
	done
	# Let udev complete its work before we unload the ramzswap module
	if [ -f "$UDEVADM_BIN" ]; then
	    $UDEVADM_BIN settle
	else
	    sleep 2
	fi
	echo -n "Unloading $ZRAM module "
	$MODPROBE_BIN -qr $ZRAM &> /dev/null
	rc_status -v
	;;
    restart)
	$0 stop
	$0 start
	;;
    status)
	echo -n "Checking for compcache "
	if is_comp_swap_on $SWAPDEVNM; then
	    rc_failed 0
	else
	    rc_failed 3
	fi
	rc_status -v
	;;
    *)
	echo "Usage: $0 {start|stop|status|restart}"
	exit 1
	;;
esac
rc_exit

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