diff options
Diffstat (limited to 'package/system/zram-swap')
| -rw-r--r-- | package/system/zram-swap/Makefile | 46 | ||||
| -rw-r--r-- | package/system/zram-swap/files/zram.init | 123 |
2 files changed, 169 insertions, 0 deletions
diff --git a/package/system/zram-swap/Makefile b/package/system/zram-swap/Makefile new file mode 100644 index 0000000..bded5f3 --- /dev/null +++ b/package/system/zram-swap/Makefile @@ -0,0 +1,46 @@ +# +# Copyright (C) 2013 OpenWrt.org +# +# This is free software, licensed under the GNU General Public License v2. +# See /LICENSE for more information. +# + +include $(TOPDIR)/rules.mk + +PKG_NAME:=zram-swap +PKG_VERSION:=1 +PKG_RELEASE:=2 + +PKG_BUILD_DIR := $(BUILD_DIR)/$(PKG_NAME) + +include $(INCLUDE_DIR)/package.mk + +define Package/zram-swap + SECTION:=utils + CATEGORY:=Base system + DEPENDS:=+kmod-zram +!(BUSYBOX_CONFIG_MKSWAP&&BUSYBOX_CONFIG_SWAPONOFF):swap-utils + TITLE:=ZRAM swap scripts + PKGARCH:=all +endef + +define Package/zram-swap/description + A script to activate swaping on a compressed zram partition. This + could be used to increase the available memory, by using compressed + memory. +endef + +define Build/Prepare +endef + +define Build/Configure +endef + +define Build/Compile +endef + +define Package/zram-swap/install + $(INSTALL_DIR) $(1)/etc/init.d + $(INSTALL_BIN) ./files/zram.init $(1)/etc/init.d/zram +endef + +$(eval $(call BuildPackage,zram-swap)) diff --git a/package/system/zram-swap/files/zram.init b/package/system/zram-swap/files/zram.init new file mode 100644 index 0000000..23de915 --- /dev/null +++ b/package/system/zram-swap/files/zram.init @@ -0,0 +1,123 @@ +#!/bin/sh /etc/rc.common + +START=15 + +ram_size() +{ + local line + + while read line; do case "$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 +} + |