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LinuxDevices.com: Design of a Fully Preemptable Linux Kernel [white paper]

Sep 10, 2000, 13:00 (0 Talkback[s])
(Other stories by Nigel Gamble, George Anzinger)


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"MontaVista has developed a hard real-time fully preemptable Linux kernel, based on Linux kernel 2.4. The preemptable kernel has the potential to dramatically improve application responsiveness of the Linux kernel, while fully preserving the standard Linux programming model. The current prototype of the preemptable Linux kernel (for IA32/X86 platforms) is available for ftp download, at ftp://ftp.mvista.com."

"The preemption model used is to allow the kernel to be preempted at any time when it is not locked. This is very different from the model where preemption is actively requested by the currently executing code. Using this model, when an event occurs that causes a higher priority task to be executable, the system will preempt the current task and run the higher priority task. Of course, there are times when this should not be done."

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