When should I write a Linux kernel module?

Question

Some people want to move code from user space to kernel space in Linux for some reason. A lot of times the reason seems to be that the code should have particularly high priorit

Answer 1

Another reason to not move code into kernel space is that when you use it in production or commercial situations, you will have to publish that code due to the GPL agreement. A situation that many software companies don't want to come into. :)