How to Use User Mode Linux
Many many years ago, when I was working at a large 3-letter-starting-with-S Unix company (no, not the graphics guys, nor the suing-Linux-for-Microsoft guys), we were planning a Linux compatibility layer... At the time, there were a couple of options out there - lxrun and uml. Anyone remember lxrun? I tested them both and did a little write-up, basically saying that neither of them ran reliably or fast enough to be worth adopting<p>What we decided was to go with option 3 - we implemented a Linux system call interface within our own kernel to give us 'native' support. This, of course, is exactly what the first version of WSL did, many years later. Plus ça change...