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The ARMv5 CPUs are inexpensive, low power, 32 bit processors widely used in embedded systems. Because of these processors' cache implementation, using memory protection on these systems incurs a performance penalty too large for many real time applications. By implementing the Fast Context Switch Extension, the authors achieved improved cache performance while retaining memory protection under the Linux 2.6 kernel. They briefly discuss the problem; explain the necessary changes to the Linux memory management system, and present performance measurements taken from artificial and real world applications.
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