The comparison of communication methods between user and Kernel space in embedded Linux

Many communication methods between Kernel and User Space in Linux operation system are simply illustrated in this paper. It includes Kernel Boot Parameters, Module Parameters and Sysfs, Sysctl, System Call, Netlink, Procfs, Seq_file, Debugfs and Relayfs. And system call and procfs are used more extensively than any other methods. Then two Inter-Process Communication (IPC) methods, Netlink and /proc, are fully compared. Based on the advantages of netlink, netlink socket can substitute for /proc and be extensively applied in embedded Linux. Finally, an application of Netlink on GPON ONU is introduced in detail, which helps to debug software in the period of development.