Unix Systems For Modern Architectures -1994- Pdf !exclusive! -

The document you are looking for is actually a highly regarded book titled

Conclusion

UNIX Systems for Modern Architectures: Symmetric Multiprocesssing and Caching for Kernel Programmers unix systems for modern architectures -1994- pdf

If you find the PDF, do not just skim it. Compile the example kernel module. Run it on a simulator. You will realize that "modern" is just a temporary label, but systems thinking is forever. The document you are looking for is actually

By 1994, this was obsolete. The new "modern architectures" were RISC-based, deeply pipelined, and clocked far beyond what the dull, sequential logic of original Unix could handle. unix systems for modern architectures -1994- pdf

Here is a deep, reflective piece on that hypothetical (or very real, lost) document.