1 #!/bin/sh /etc/rc.common
9 while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo
12 zram_size() # in megabytes
14 local zram_size="$( uci -q get system.@system[0].zram_size_mb )"
15 local ram_size="$( ram_size )"
17 if [ -z "$zram_size" ]; then
18 # e.g. 6mb for 16mb-routers or 61mb for 128mb-routers
19 echo $(( ram_size / 2048 ))
29 grep -sq ^"$zram_dev " /proc/swaps && {
30 logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active"
34 [ -e "$zram_dev" ] || {
35 logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found"
39 which mkswap >/dev/null || {
40 logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
44 which swapon >/dev/null || {
45 logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
49 which swapoff >/dev/null || {
50 logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
59 echo "/dev/zram${core:-0}"
66 local proc_entry="/sys/block/$( basename "$dev" )/reset"
68 logger -s -t zram_reset -p daemon.debug "$message via $proc_entry"
69 echo "1" >"$proc_entry"
74 # Offset by 1 if /dev/zram0 is in use by /tmp
75 if mount | grep -q /dev/zram0; then
77 # Hot-add new ZRAM device (if necessary)
78 if [ ! -b /dev/zram1 ]; then
79 cat /sys/class/zram-control/hot_add
92 } done <"/proc/cpuinfo"
97 # http://shmilyxbq-compcache.googlecode.com/hg/README
98 # if >1 cpu_core, reinit kmodule with e.g. num_devices=4
100 local zram_size="$( zram_size )"
103 for core in $( list_cpu_idx ); do {
104 zram_dev="$( zram_dev "$core" )"
105 zram_applicable "$zram_dev" || return 1
107 logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
109 zram_reset "$zram_dev" "enforcing defaults"
110 echo $(( zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
118 local zram_dev proc_entry
120 for core in $( list_cpu_idx ); do {
121 zram_dev="$( zram_dev "$core" )"
122 proc_entry="/sys/block/$( basename "$zram_dev" )/reset"
124 grep -sq ^"$zram_dev " /proc/swaps && {
125 logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev"
129 zram_reset "$zram_dev" "claiming memory back"