Linux kernel is not preemptive, that is, a running process cannot
be preempted (replaced by a higher-priority process) while it remains in Kernel Mode. In
particular, the following assertions always hold in Linux:
- No process running in Kernel Mode may be replaced by another process, except when the former voluntarily relinquishes control of the CPU.
- Interrupt or exception handling can interrupt a process running in Kernel Mode
however, when the interrupt handler terminates, the kernel control path of the process is resumed.
