Reasons a Process is Unmigratable

1. Performing a privileged operation, anything that would need superuser access.
2. Having real-time priority.
3. Having a writable, memory mapped file.
4. Having a character device memory mapped.
5. Running code in vm86 mode (with the sys_vm86 or sys_vm86old system call).
6. Having a VMA or a MM structure that is marked VM_LOCKED.
7. Not having a MM structure, or having a MM structure that is in use by more than one process (threads!)
8. Being either the INIT process (pid 1), or a process that was created by our om_daemonize in-kernel call.
9. Performing IO directly on a port.