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author | Vasilis Tsiligiannis <acinonyx@openwrt.gr> | 2013-01-07 12:01:11 +0000 |
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committer | Vasilis Tsiligiannis <acinonyx@openwrt.gr> | 2013-01-07 12:01:11 +0000 |
commit | c86485210ba6136bc90fc2708611ae5a609b6bf1 (patch) | |
tree | 360749bb8e6c25b38b491cf8027ec8be6e4af685 /package/zram-swap/files/zram.init | |
parent | cedbe66e9aa9e1b28fc2995c36c8e389b1b09cfe (diff) | |
download | master-31e0f0ae-c86485210ba6136bc90fc2708611ae5a609b6bf1.tar.gz master-31e0f0ae-c86485210ba6136bc90fc2708611ae5a609b6bf1.tar.bz2 master-31e0f0ae-c86485210ba6136bc90fc2708611ae5a609b6bf1.zip |
zram-swap: Install init script with 0755 mode
SVN-Revision: 35033
Diffstat (limited to 'package/zram-swap/files/zram.init')
-rw-r--r-- | package/zram-swap/files/zram.init | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/package/zram-swap/files/zram.init b/package/zram-swap/files/zram.init new file mode 100644 index 0000000000..23de915c8f --- /dev/null +++ b/package/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 +} + |