Simple-Stupid user-space program doing "kill -STOP" and "kill -CONT" to protect from thrashing
Thrashing: https://en.wikipedia.org/wiki/Thrashing_%28computer_science%29

The TTY subsystem is central to the design of Linux, and UNIX in general. Unfortunately, its importance is often overlooked, and it is difficult to find good introductory articles about it. I believe that a basic understanding of TTYs in Linux is essential for the developer and the advanced user.