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 [ -e "$zram_dev" ] ||
{
30 logger
-s -t zram_applicable
-p daemon.crit
"[ERROR] device '$zram_dev' not found"
34 which mkswap
>/dev
/null ||
{
35 logger
-s -t zram_applicable
-p daemon.err
"[ERROR] 'mkswap' not installed"
39 which swapon
>/dev
/null ||
{
40 logger
-s -t zram_applicable
-p daemon.err
"[ERROR] 'swapon' not installed"
44 which swapoff
>/dev
/null ||
{
45 logger
-s -t zram_applicable
-p daemon.err
"[ERROR] 'swapoff' not installed"
53 echo "/dev/zram${idx:-0}"
60 local proc_entry
="/sys/block/$( basename "$dev" )/reset"
62 logger
-s -t zram_reset
-p daemon.debug
"$message via $proc_entry"
63 echo "1" >"$proc_entry"
68 #get unallocated zram dev
69 local zdev
=$
( zram_dev
)
71 if [ "$(mount | grep $zdev)" ]; then
72 local idx
=`cat /sys/class/zram-control/hot_add`
73 zdev
="$( zram_dev $idx )"
82 local zram_comp_algo
="$( uci -q get system.@system[0].zram_comp_algo )"
84 if [ -z "$zram_comp_algo" ] ||
[ ! -e /sys
/block
/$
( basename $dev )/comp_algorithm
]; then
88 if [ `grep -c "$zram_comp_algo" /sys/block/$( basename $dev )/comp_algorithm` -ne 0 ]; then
89 logger
-s -t zram_comp_algo
-p daemon.debug
"Set compression algorithm '$zram_comp_algo' for zram '$dev'"
90 echo $zram_comp_algo > "/sys/block/$( basename $dev )/comp_algorithm"
92 logger
-s -t zram_comp_algo
-p daemon.debug
"Compression algorithm '$zram_comp_algo' is not supported for '$dev'"
99 local logical_cpus
=$
( grep -ci "^processor" /proc
/cpuinfo
)
100 [ $logical_cpus -gt 1 ] ||
return 1
101 local zram_comp_streams
="$( uci -q get system.@system[0].zram_comp_streams )"
102 [ -n "$zram_comp_streams" ] && [ "$zram_comp_streams" -le "$logical_cpus" ] || zram_comp_streams
=$logical_cpus
103 if [ -e /sys
/block
/$
( basename $dev )/max_comp_streams
]; then
104 logger
-s -t zram_comp_streams
-p daemon.debug
"Set max compression streams to '$zram_comp_streams' for zram '$dev'"
105 echo $zram_comp_streams > /sys
/block
/$
( basename $dev )/max_comp_streams
111 local zram_size
="$( zram_size )"
114 if [ $
( grep -cs zram
/proc
/swaps
) -ne 0 ]; then
115 logger
-s -t zram_start
-p daemon.notice
"[OK] zram swap is already mounted"
119 zram_dev
="$( zram_getdev )"
120 zram_applicable
"$zram_dev" ||
return 1
122 logger
-s -t zram_start
-p daemon.debug
"activating '$zram_dev' for swapping ($zram_size MegaBytes)"
124 zram_reset
"$zram_dev" "enforcing defaults"
125 zram_comp_algo
"$zram_dev"
126 zram_comp_streams
"$zram_dev"
127 echo $
(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename "$zram_dev" )/disksize"
136 for zram_dev
in $
( grep zram
/proc
/swaps |
awk '{print $1}' ); do {
137 logger
-s -t zram_stop
-p daemon.debug
"deactivate swap $zram_dev"
138 swapoff
"$zram_dev" && zram_reset
"$zram_dev" "claiming memory back"
139 local dev_index
="$( echo $zram_dev | grep -o "[0-9]*$
" )"
140 if [ $dev_index -ne 0 ]; then
141 logger
-s -t zram_stop
-p daemon.debug
"removing zram $zram_dev"
142 echo $dev_index > /sys
/class
/zram-control
/hot_remove