From patchwork Tue Sep 18 19:35:07 2012
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Subject: [meta-oe,V2] zram: Integrate an init script
Date: Tue, 18 Sep 2012 19:35:07 -0000
From: Andrei Gherzan <andrei@gherzan.ro>
X-Patchwork-Id: 36845
Message-Id: <1347996907-22852-1-git-send-email-andrei@gherzan.ro>
To: openembedded-devel@lists.openembedded.org

Signed-off-by: Andrei Gherzan <andrei@gherzan.ro>

---
meta-oe/recipes-extended/zram/zram/init         |   28 +++++++++++++++++
 meta-oe/recipes-extended/zram/zram/zram-load.sh |   37 +++++++++++++++++++++++
 meta-oe/recipes-extended/zram/zram_0.1.bb       |   24 +++++++++++++++
 3 files changed, 89 insertions(+)
 create mode 100644 meta-oe/recipes-extended/zram/zram/init
 create mode 100644 meta-oe/recipes-extended/zram/zram/zram-load.sh
 create mode 100644 meta-oe/recipes-extended/zram/zram_0.1.bb

diff --git a/meta-oe/recipes-extended/zram/zram/init b/meta-oe/recipes-extended/zram/zram/init
new file mode 100644
index 0000000..7bd8bcc
--- /dev/null
+++ b/meta-oe/recipes-extended/zram/zram/init
@@ -0,0 +1,28 @@
+#!/bin/bash
+### BEGIN INIT INFO
+# Provides: zram
+# Required-Start:
+# Required-Stop:
+# Default-Start: 2 3 4 5
+# Default-Stop: 0 1 6
+# Short-Description: Increased Performance In Linux With zRam (Virtual Swap Compressed in RAM)
+### END INIT INFO
+set -e
+
+case "$1" in
+    start)
+        zram-load.sh --load
+        ;;
+    stop)
+        zram-load.sh --unload
+        ;;
+    restart)
+        zram-load.sh --unload
+        sleep 3
+        zram-load.sh --load
+        ;;
+    *)
+        echo "Usage: $0 {start|stop|restart}"
+        RETVAL=1
+esac
+exit $RETVAL
diff --git a/meta-oe/recipes-extended/zram/zram/zram-load.sh b/meta-oe/recipes-extended/zram/zram/zram-load.sh
new file mode 100644
index 0000000..786cd0c
--- /dev/null
+++ b/meta-oe/recipes-extended/zram/zram/zram-load.sh
@@ -0,0 +1,37 @@
+#!/bin/sh
+
+num_cpus=$(grep -c processor /proc/cpuinfo)
+[ "$num_cpus" != 0 ] || num_cpus=1
+
+last_cpu=$((num_cpus - 1))
+
+mem_by_cpu=$(awk -v cpus=$num_cpus '/MemTotal/ { print (($2 * 1024) / cpus) }' /proc/meminfo)
+
+if [ "$1" = "--load" ] ; then
+	echo zram: Trying to load kernel module.
+
+	# Linux 3.2 workaround - value name changed :o.
+	modprobe -q zram zram_num_devices=$num_cpus
+
+	# Linux < 3.2.
+	#modprobe -q zram num_devices=$num_cpus
+
+	echo zram: Enable in-memory compressed swap of $mem_by_cpu bytes.
+	for i in $(seq 0 $last_cpu); do
+		echo 1 > /sys/block/zram$i/reset
+		echo $mem_by_cpu > /sys/block/zram$i/disksize
+		mkswap /dev/zram$i
+		swapon -p 100 /dev/zram$i
+	done
+fi
+
+if [ "$1" = "--unload" ] ; then
+	echo zram: Disable in-memory compressed swap.
+	for i in $(seq 0 $last_cpu); do
+		grep -q "/dev/zram$i" /proc/swaps && swapoff /dev/zram$i
+	done
+
+	sleep 1
+	echo zram: Unload kernel module.
+	rmmod zram
+fi
diff --git a/meta-oe/recipes-extended/zram/zram_0.1.bb b/meta-oe/recipes-extended/zram/zram_0.1.bb
new file mode 100644
index 0000000..dd59784
--- /dev/null
+++ b/meta-oe/recipes-extended/zram/zram_0.1.bb
@@ -0,0 +1,24 @@
+DESCRIPTION = "Linux zram compressed in-memory swap"
+LICENSE = "MIT"
+LIC_FILES_CHKSUM = "file://${COREBASE}/LICENSE;md5=3f40d7994397109285ec7b81fdeb3b58"
+
+inherit allarch update-rc.d
+
+RDEPENDS_${PN} = "util-linux-swaponoff kmod kernel-module-zram"
+
+PR = "r0"
+
+SRC_URI = " \
+           file://init \
+           file://zram-load.sh \
+          "
+
+do_install () {
+	install -d ${D}/${bindir}
+	install -m 0755 ${WORKDIR}/zram-load.sh ${D}/${bindir}
+	install -d ${D}${sysconfdir}/init.d
+	install -m 0755 ${WORKDIR}/init ${D}${sysconfdir}/init.d/zram
+}
+
+INITSCRIPT_NAME = "zram"
+INITSCRIPT_PARAMS = "start 05 2 3 4 5 . stop 22 0 1 6 ."