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9a5509736a
* "zram stop" could reset up to $(num_of_cores) zram devices even if
some of those were not mounted as swap dev's. This fix tries to
enumerate mounted swap zram dev's before making a reset
* remove hot-added zram devs on stop (except zram0)
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
(backported from 9edc1fe8ab)
149 lines
3.4 KiB
Bash
149 lines
3.4 KiB
Bash
#!/bin/sh /etc/rc.common
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START=15
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ram_size()
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{
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local line
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while read line; do case "$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="$1"
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grep -sq ^"$zram_dev " /proc/swaps && {
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logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active"
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return 1
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}
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[ -e "$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 core="$1"
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echo "/dev/zram${core:-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_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 '$dev'"
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fi
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}
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list_cpu_idx()
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{
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# Offset by 1 if /dev/zram0 is in use by /tmp
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if mount | grep -q /dev/zram0; then
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local line i=1
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# Hot-add new ZRAM device (if necessary)
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if [ ! -b /dev/zram1 ]; then
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cat /sys/class/zram-control/hot_add
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fi
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else
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local line i=0
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fi
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while read line; do {
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case "$line" in
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[Pp]rocessor*)
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echo $i
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i=$(( i + 1 ))
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;;
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esac
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} done <"/proc/cpuinfo"
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}
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start()
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{
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# http://shmilyxbq-compcache.googlecode.com/hg/README
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# if >1 cpu_core, reinit kmodule with e.g. num_devices=4
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local zram_size="$( zram_size )"
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local zram_dev core
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for core in $( list_cpu_idx ); do {
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zram_dev="$( zram_dev "$core" )"
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zram_applicable "$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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echo $(( zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
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zram_comp_algo "$zram_dev"
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mkswap "$zram_dev"
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swapon "$zram_dev"
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} done
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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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