“Some oppose a preemptible kernel because of throughput concerns. Others oppose preemptibility because of concerns about growing complexity in the kernel. This argument is specious, because the preemption approach takes advantage of already required and in place SMP locking. No additional complexity is created. All Linux kernel engineering must already take into account SMP requirements. Some oppose continued refinement of SMP locking to achieve better SMP scaling (on higher way SMP systems); such refinement has the beneficial side effect of also reducing preemption off periods in a preemptible kernel.” Read the rest of the editorial at LinuxDevices by Kevin Morgan who is the Vice President, Engineering at MontaVista Software.