RDKB-64189: Enable ZRAM to optimize and reduce RDKB memory usage

init-zram_broadband.sh

@@ -0,0 +1,94 @@
+####################################################################################
+# If not stated otherwise in this file or this component's Licenses.txt file the
+# following copyright and licenses apply:
+#
+#  Copyright 2018 RDK Management
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+##################################################################################
+. /etc/include.properties
+. /etc/device.properties
+
+ZRAM_LOGFILE="${LOG_PATH}/zram.log"
+
+echo_t() {
+    echo "$(date +"%y%m%d-%T.%6N") $1" >>$ZRAM_LOGFILE
+}
+
+# Wait for the DM system to come up
+dmIsUp=1
+while [ "x$dmIsUp" != "x0" ]; do
+    dmcli eRT getv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.Enable | grep value
+    dmIsUp=$?
+    sleep 10
+done
+
+# Check if MEMSWAP is enabled by RFC, exit if not enabled
+MEMSWAP_RFC_ENABLE=$(dmcli eRT retv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.Enable)
+if [ "x$MEMSWAP_RFC_ENABLE" != "xtrue" ]; then
+    echo_t "MEMSWAP is disabled"
+    exit 1
+fi
+
+# Load ZRAM module with one block device for SWAP
+if modinfo zram | grep -q ' zram_num_devices:' 2>/dev/null; then
+    MODPROBE_ARGS="zram_num_devices=1"
+elif modinfo zram | grep -q ' num_devices:' 2>/dev/null; then
+    MODPROBE_ARGS="num_devices=1"
+else
+    exit 1
+fi
+modprobe zram "$MODPROBE_ARGS"
+
+# Wait for the module to load
+sleep 3
+
+# Configure the disk size
+MEMSWAP_DISK_SIZE=$(dmcli eRT retv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.DiskSize)
+if [ -z "$MEMSWAP_DISK_SIZE" ]; then
+    echo_t "MEMSWAP disk size not retrieved from RFC, setting to default of 300MB"
+    MEMSWAP_DISK_SIZE=300
+fi
+echo "${MEMSWAP_DISK_SIZE}M" >/sys/block/zram0/disksize
+echo_t "MEMSWAP disk size set to ${MEMSWAP_DISK_SIZE}M"
+
+# Configure the system swappiness
+MEMSWAP_TUNABLES_SWAPPINESS=$(dmcli eRT retv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.Tunables.Swappiness)
+if [ -z "$MEMSWAP_TUNABLES_SWAPPINESS" ]; then
+    echo_t "MEMSWAP swappiness not retrieved from RFC, keeping system default"
+else
+    sysctl -w vm.swappiness="$MEMSWAP_TUNABLES_SWAPPINESS"
+    echo_t "System swappiness set to ${MEMSWAP_TUNABLES_SWAPPINESS}"
+fi
+
+# Configure the system watermark scale factor
+MEMSWAP_TUNABLES_WATERMARK_SCALE_FACTOR=$(dmcli eRT retv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.Tunables.WatermarkScaleFactor)
+if [ -z "$MEMSWAP_TUNABLES_WATERMARK_SCALE_FACTOR" ]; then
+    echo_t "MEMSWAP watermark scale factor not retrieved from RFC, keeping system default"
+else
+    sysctl -w vm.watermark_scale_factor="$MEMSWAP_TUNABLES_WATERMARK_SCALE_FACTOR"
+    echo_t "System watermark scale factor set to ${MEMSWAP_TUNABLES_WATERMARK_SCALE_FACTOR}"
+fi
+
+# Configure the system page cluster for SWAP
+MEMSWAP_TUNABLES_PAGE_CLUSTER=$(dmcli eRT retv Device.DeviceInfo.X_RDKCENTRAL-COM_RFC.Feature.MEMSWAP.Tunables.PageCluster)
+if [ -z "$MEMSWAP_TUNABLES_PAGE_CLUSTER" ]; then
+    echo_t "MEMSWAP page cluster not retrieved from RFC, keeping system default"
+else
+    sysctl -w vm.page-cluster="$MEMSWAP_TUNABLES_PAGE_CLUSTER"
+    echo_t "System page cluster for SWAP set to ${MEMSWAP_TUNABLES_PAGE_CLUSTER}"
+fi
+
+# Enable the ZRAM SWAP device
+mkswap /dev/zram0
+swapon -p 5 /dev/zram0