mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-25 16:31:13 +00:00
b9e89adfb7
Compression algorithms for zram are provided by kernel crypto API, could be any of [lzo|zl4|deflate|<some_more>] depending on kernel modules. Compress algo for zram-swap could be defined via 'zram_comp_algo' option in 'system' section of '/etc/config/system' file, or via cli (for e.x. with 'uci set system.@System[0].zram_comp_algo=lz4 && uci commit system'). check available algo's via 'cat /sys/block/zram0 /comp_algorithm' Signed-off-by: Emil Muratov <gpm@hotplug.ru>
151 lines
3.3 KiB
Bash
151 lines
3.3 KiB
Bash
#!/bin/sh /etc/rc.common
|
|
|
|
START=15
|
|
|
|
ram_size()
|
|
{
|
|
local line
|
|
|
|
while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo
|
|
}
|
|
|
|
zram_size() # in megabytes
|
|
{
|
|
local zram_size="$( uci -q get system.@system[0].zram_size_mb )"
|
|
local ram_size="$( ram_size )"
|
|
|
|
if [ -z "$zram_size" ]; then
|
|
# e.g. 6mb for 16mb-routers or 61mb for 128mb-routers
|
|
echo $(( ram_size / 2048 ))
|
|
else
|
|
echo "$zram_size"
|
|
fi
|
|
}
|
|
|
|
zram_applicable()
|
|
{
|
|
local zram_dev="$1"
|
|
|
|
grep -sq ^"$zram_dev " /proc/swaps && {
|
|
logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active"
|
|
return 1
|
|
}
|
|
|
|
[ -e "$zram_dev" ] || {
|
|
logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found"
|
|
return 1
|
|
}
|
|
|
|
which mkswap >/dev/null || {
|
|
logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
|
|
return 1
|
|
}
|
|
|
|
which swapon >/dev/null || {
|
|
logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
|
|
return 1
|
|
}
|
|
|
|
which swapoff >/dev/null || {
|
|
logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
|
|
return 1
|
|
}
|
|
}
|
|
|
|
zram_dev()
|
|
{
|
|
local core="$1"
|
|
|
|
echo "/dev/zram${core:-0}"
|
|
}
|
|
|
|
zram_reset()
|
|
{
|
|
local dev="$1"
|
|
local message="$2"
|
|
local proc_entry="/sys/block/$( basename "$dev" )/reset"
|
|
|
|
logger -s -t zram_reset -p daemon.debug "$message via $proc_entry"
|
|
echo "1" >"$proc_entry"
|
|
}
|
|
|
|
zram_comp_algo()
|
|
{
|
|
local dev="$1"
|
|
local zram_comp_algo="$( uci -q get system.@system[0].zram_comp_algo )"
|
|
|
|
if [ -z "$zram_comp_algo" ] || [ ! -e /sys/block/$( basename $dev )/comp_algorithm ]; then
|
|
return 0
|
|
fi
|
|
|
|
if [ `grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm` -ne 0 ]; then
|
|
logger -s -t zram_comp_algo -p daemon.debug "Set compression algorithm '$zram_comp_algo' for zram '$dev'"
|
|
echo $zram_comp_algo > "/sys/block/$( basename $dev )/comp_algorithm"
|
|
else
|
|
logger -s -t zram_comp_algo -p daemon.debug "Compression algorithm '$zram_comp_algo' is not supported for '$dev'"
|
|
fi
|
|
}
|
|
|
|
list_cpu_idx()
|
|
{
|
|
# Offset by 1 if /dev/zram0 is in use by /tmp
|
|
if mount | grep -q /dev/zram0; then
|
|
local line i=1
|
|
# Hot-add new ZRAM device (if necessary)
|
|
if [ ! -b /dev/zram1 ]; then
|
|
cat /sys/class/zram-control/hot_add
|
|
fi
|
|
else
|
|
local line i=0
|
|
fi
|
|
|
|
while read line; do {
|
|
case "$line" in
|
|
[Pp]rocessor*)
|
|
echo $i
|
|
i=$(( i + 1 ))
|
|
;;
|
|
esac
|
|
} done <"/proc/cpuinfo"
|
|
}
|
|
|
|
start()
|
|
{
|
|
# http://shmilyxbq-compcache.googlecode.com/hg/README
|
|
# if >1 cpu_core, reinit kmodule with e.g. num_devices=4
|
|
|
|
local zram_size="$( zram_size )"
|
|
local zram_dev core
|
|
|
|
for core in $( list_cpu_idx ); do {
|
|
zram_dev="$( zram_dev "$core" )"
|
|
zram_applicable "$zram_dev" || return 1
|
|
|
|
logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
|
|
|
|
zram_reset "$zram_dev" "enforcing defaults"
|
|
echo $(( zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
|
|
zram_comp_algo "$zram_dev"
|
|
mkswap "$zram_dev"
|
|
swapon "$zram_dev"
|
|
} done
|
|
}
|
|
|
|
stop()
|
|
{
|
|
local zram_dev proc_entry
|
|
|
|
for core in $( list_cpu_idx ); do {
|
|
zram_dev="$( zram_dev "$core" )"
|
|
proc_entry="/sys/block/$( basename "$zram_dev" )/reset"
|
|
|
|
grep -sq ^"$zram_dev " /proc/swaps && {
|
|
logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev"
|
|
swapoff "$zram_dev"
|
|
}
|
|
|
|
zram_reset "$zram_dev" "claiming memory back"
|
|
} done
|
|
}
|
|
|