Linux/RK -- a Linux Resource Kernel

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(Last updated: Apr. 12, 2000)

Linux/RK stands for Linux / Resource Kernel, which incorporates real-time extensions to the Linux kernel to support the abstractions of a resource kernel. A resource kernel is a real-time kernel (operating system) that provides timely, guaranteed and enforced access to system resources for applications.

A slightly outdated description on Linux/RK can be obtained by clicking here. Please refer to the articles on Resource Kernel and Portable Resource Kernel to gain a better understanding of Linux/RK. You may also want to look at other documents located here related to this effort.

Linux/RK is developed by the Real-time and Multimedia Systems Laboratory led by Dr. Raj Rajkumar at Carnegie Mellon University. The current version was built by Dr. Shui Oikawa and builds on earlier work done by the Real-time and Multimedia Systems Laboratory.

Linux/RK Download

The Linux/RK Download is available on the Linux/RK website, at www.cs.cmu.edu/~rajkumar/linux-rk.html. The package has not been released publicly yet, so please bear with us while the details are filled in. It is being released selectively to enable quicker dissemination and adoption.

Linux Modifications made for Linux/RK:

Makefile -- Modify to compile and link RK files
arch/i386/Makefile -- Do not check vmlinux for zlilo (takes too long to install)
arch/i386/kernel/entry.S
-- Add hooks when leaving from the kernel
-- Add system call entries (201 - 205)
arch/i386/kernel/irq.h -- Add hooks when entering the kernel
drivers/char/serial.c -- Make the speed of serial console 38400bps from 9600bps
include/linux/sched.h
-- Add the pointer to a resource set in task structure
-- Modify INIT_TASK to initialize that pointer
include/asm-i386/unistd.h -- Add system call entry numbers (201 - 205)
init/main.c -- Add rk_init()
kernel/sched.c -- Add schedule hook

Other notes:

APM does not work with Linux/RK -- APM should not be include in the configuration since the variable CPU speeds of APM is not compatible with the scheme Linux/RK uses to keep track of processes' CPU utilization. Linux/RK uses CPU cycles to know how much CPU time is used by a process, and Linux/RK does not follow the changes of CPU speeds caused by APM (yet?).

Incomplete implementation -- The implementation of the admission control and portable scheduling architecture mentioned in the Linux/RK paper has not yet been completed.

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