zram: add package to use compressed ram disk for swap
The busybox size is increased by 3.2KByte uncompressed on bcm47xx with this commit. This zram-swap automatically creates a zram device, a swap partition on it and make the kernel swap pages to it. Thank you Bastian Bittorf <bittorf@bluebottle.com> for idea and the script. SVN-Revision: 35025v19.07.3_mercusys_ac12_duma
Hauke Mehrtens
12 years ago
parent
5154270694
commit
bef592844b
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#
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# Copyright (C) 2013 OpenWrt.org
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#
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# This is free software, licensed under the GNU General Public License v2.
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# See /LICENSE for more information.
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#
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include $(TOPDIR)/rules.mk
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PKG_NAME:=zram-swap
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PKG_VERSION:=1
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PKG_RELEASE:=1
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PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME)
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include $(INCLUDE_DIR)/package.mk
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define Package/zram-swap
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SECTION:=utils
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CATEGORY:=Base system
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DEPENDS:=+kmod-zram +!(BUSYBOX_CONFIG_MKSWAP&&BUSYBOX_CONFIG_SWAPONOFF):swap-utils
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TITLE:=ZRAM swap scripts
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PKGARCH:=all
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endef
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define Package/zram-swap/description
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A script to activate swaping on a compressed zram partition. This
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could be used to increase the available memory, by using compressed
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memory.
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endef
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define Build/Prepare
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endef
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define Build/Configure
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endef
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define Build/Compile
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endef
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define Package/zram-swap/install
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$(INSTALL_DIR) $(1)
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$(CP) ./files/* $(1)/
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endef
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$(eval $(call BuildPackage,zram-swap))
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@ -0,0 +1,123 @@
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#!/bin/sh /etc/rc.common
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START=15
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ram_size()
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{
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local line
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while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo
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}
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zram_size() # in megabytes
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{
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local zram_size="$( uci -q get system.@system[0].zram_size_mb )"
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local ram_size="$( ram_size )"
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if [ -z "$zram_size" ]; then
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# e.g. 6mb for 16mb-routers or 61mb for 128mb-routers
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echo $(( $ram_size / 2048 ))
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else
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echo "$zram_size"
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fi
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}
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zram_applicable()
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{
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local zram_dev="$1"
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grep -sq ^"$zram_dev " /proc/swaps && {
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logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active"
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return 1
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}
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[ -e "$zram_dev" ] || {
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logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found"
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return 1
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}
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which mkswap >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed"
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return 1
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}
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which swapon >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed"
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return 1
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}
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which swapoff >/dev/null || {
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logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed"
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return 1
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}
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}
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zram_dev()
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{
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local core="$1"
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echo "/dev/zram${core:-0}"
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}
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zram_reset()
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{
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local dev="$1"
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local message="$2"
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local proc_entry="/sys/block/$( basename "$dev" )/reset"
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logger -s -t zram_reset -p daemon.debug "$message via $proc_entry"
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echo "1" >"$proc_entry"
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}
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list_cpu_idx()
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{
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local line i=0
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while read line; do {
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case "$line" in
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[Pp]rocessor*)
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echo $i
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i=$(( $i + 1 ))
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;;
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esac
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} done <"/proc/cpuinfo"
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}
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start()
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{
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# http://shmilyxbq-compcache.googlecode.com/hg/README
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# if >1 cpu_core, reinit kmodule with e.g. num_devices=4
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local zram_size="$( zram_size )"
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local zram_dev core
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for core in $( list_cpu_idx ); do {
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zram_dev="$( zram_dev "$core" )"
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zram_applicable "$zram_dev" || return 1
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logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)"
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zram_reset "$zram_dev" "enforcing defaults"
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echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename $zram_dev )/disksize"
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mkswap "$zram_dev"
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swapon "$zram_dev"
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} done
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}
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stop()
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{
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local zram_dev proc_entry
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for core in $( list_cpu_idx ); do {
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zram_dev="$( zram_dev "$core" )"
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proc_entry="/sys/block/$( basename "$zram_dev" )/reset"
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grep -sq ^"$zram_dev " /proc/swaps && {
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logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev"
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swapoff "$zram_dev"
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}
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zram_reset "$zram_dev" "claiming memory back"
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} done
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}
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