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https://github.com/openwrt/openwrt.git
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2d4b52707d
Use only one zram swap device of the specified $size instead of
[N x $size] devices for multicore CPUs Now zram module uses multiple
compression streams for each dev by default, so we do not need to create
several zram devs to utilize multicore CPUs.
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
(backported from 814cae7362)
133 lines
3.1 KiB
Bash
Executable File
133 lines
3.1 KiB
Bash
Executable File
#!/bin/sh /etc/rc.common
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START=15
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ram_size()
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{
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local line
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while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo
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}
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zram_size() # in megabytes
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{
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local zram_size="$( uci -q get system.@system[0].zram_size_mb )"
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local ram_size="$( ram_size )"
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if [ -z "$zram_size" ]; then
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# e.g. 6mb for 16mb-routers or 61mb for 128mb-routers
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echo $(( ram_size / 2048 ))
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else
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echo "$zram_size"
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fi
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}
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zram_applicable()
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{
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local zram_dev="$1"
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[ -e "$zram_dev" ] || {
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logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found"
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return 1
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}
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which mkswap >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
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return 1
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}
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which swapon >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
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return 1
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}
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which swapoff >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
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return 1
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}
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}
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zram_dev()
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{
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local idx="$1"
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echo "/dev/zram${idx:-0}"
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}
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zram_reset()
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{
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local dev="$1"
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local message="$2"
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local proc_entry="/sys/block/$( basename "$dev" )/reset"
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logger -s -t zram_reset -p daemon.debug "$message via $proc_entry"
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echo "1" >"$proc_entry"
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}
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zram_getdev()
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{
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#get unallocated zram dev
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local zdev=$( zram_dev )
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if [ "$(mount | grep $zdev)" ]; then
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local idx=`cat /sys/class/zram-control/hot_add`
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zdev="$( zram_dev $idx )"
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fi
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echo $zdev
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}
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zram_comp_algo()
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{
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local dev="$1"
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local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )"
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if [ -z "$zram_comp_algo" ] || [ ! -e /sys/block/$( basename $dev )/comp_algorithm ]; then
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return 0
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fi
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if [ `grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm` -ne 0 ]; then
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logger -s -t zram_comp_algo -p daemon.debug "Set compression algorithm '$zram_comp_algo' for zram '$dev'"
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echo $zram_comp_algo > "/sys/block/$( basename $dev )/comp_algorithm"
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else
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logger -s -t zram_comp_algo -p daemon.debug "Compression algorithm '$zram_comp_algo' is not supported for '$dev'"
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fi
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}
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start()
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{
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local zram_size="$( zram_size )"
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local zram_dev
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if [ $( grep -cs zram /proc/swaps ) -ne 0 ]; then
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logger -s -t zram_start -p daemon.notice "[OK] zram swap is already mounted"
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return 1
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fi
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zram_dev="$( zram_getdev )"
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zram_applicable "$zram_dev" || return 1
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logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
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zram_reset "$zram_dev" "enforcing defaults"
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zram_comp_algo "$zram_dev"
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echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
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mkswap "$zram_dev"
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swapon "$zram_dev"
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}
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stop()
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{
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local zram_dev
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for zram_dev in $( grep zram /proc/swaps |awk '{print $1}' ); do {
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logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev"
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swapoff "$zram_dev" && zram_reset "$zram_dev" "claiming memory back"
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local dev_index="$( echo $zram_dev | grep -o "[0-9]*$" )"
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if [ $dev_index -ne 0 ]; then
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logger -s -t zram_stop -p daemon.debug "removing zram $zram_dev"
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echo $dev_index > /sys/class/zram-control/hot_remove
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fi
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} done
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}
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