packages: clean up the package folder

[openwrt.git] / package / system / zram-swap / files / zram.init

diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init
new file mode 100644 (file)
index 0000000..23de915
--- /dev/null
+++ b/package/system/zram-swap/files/zram.init
@@ -0,0 +1,123 @@
+#!/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"
+}
+
+list_cpu_idx()
+{
+       local line i=0
+
+       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 $zram_dev )/disksize"
+               mkswap "$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
+}
+