There is also a FAQ which explains the reasons and implementation. This will probably go in during the 2.3 kernel cycle. There is also an associated daemon for configurable management of device nodes available as a gzipped tarfile . The documentation is enclosed in the patch . The patch is against the latest kernel and requires the devfs patch mentioned above.
Some basic documentation is available here .
You can download a set of utilities and a programming library which uses the kernel interface from here . An update patch for the MTRR code in the 2.2 kernel. This improves the code and adds support for non-Intel CPUs. This further isolates RT processes from normal processes and hence provides faster and more deterministic context switch times for RT processes. Some of the issues are discussed here .