Merge "init: create native cgroup"

rootdir/etc/init.qcom.post_boot.sh

@@ -921,3 +921,36 @@ case "$target" in
         echo $oem_version > /sys/devices/soc0/image_crm_version
         ;;
 esac
+
+# Create native cgroup and move all tasks to it. Allot 15% real-time
+# bandwidth limit to native cgroup (which is what remains after
+# Android uses up 80% real-time bandwidth limit). root cgroup should
+# become empty after all tasks are moved to native cgroup.
+
+CGROUP_ROOT=/dev/cpuctl
+mkdir $CGROUP_ROOT/native
+echo 150000 > $CGROUP_ROOT/native/cpu.rt_runtime_us
+
+# We could be racing with task creation, as a result of which its possible that
+# we may fail to move all tasks from root cgroup to native cgroup in one shot.
+# Retry few times before giving up.
+
+for loop_count in 1 2 3
+do
+	for i in $(cat $CGROUP_ROOT/tasks)
+	do
+		echo $i > $CGROUP_ROOT/native/tasks
+	done
+
+	root_tasks=$(cat $CGROUP_ROOT/tasks)
+	if [ -z "$root_tasks" ]
+	then
+		break
+	fi
+done
+
+# Check if we failed to move all tasks from root cgroup
+if [ ! -z "$root_tasks" ]
+then
+	echo "Error: Could not move all tasks to native cgroup"
+fi