When 2.5.x was proposed, Linux stable was 2.4.22.

Linux 2.5.75 was mostly dealing with how many threads can be installed at the same time and how many minutes all the threads can be closed. The effort missed the purpose of how threads are used in real applications.

The real purpose of threads is to afford many user accounts. This is the theme of threads in realtime applications. Each new user will have a thread and closed when users leave. Think of the longdistance telephone applications.

So, Linux 2.8.x starts with a Posix packet system with one user, then subsequent users coming on will get a redundent thread each. That extra one user can use one more Prex operating system, which expands onto Linux operating system by another thread of Prex, or another user account(sending posix packets) in Linux domain and group of users.

Once the sequence of user priority is know, 2.8.x will be easily accomplished.