Fast Address-Space Switching for ARM Linux Kernels
The Fast Address-Space Switching (FASS) project aims to utilise some of the features of the Memory Management Unit in the ARM architecture to improve the performance of context switches under the L4 kernel and ARM Linux.
FASS is currently unmaintained; its functionality is included in OK Linux (virtualized Linux supported by OK Labs). However, if you want to use FASS in the Linux 2.4 kernel, it has been integrated into the SnapGear embedded Linux distribution.