[kramerger]

Can confirm.

I needed to learn how a very specific OS thing worked and I read the code from Linux, openbsd, L4, hurd, minix, and a few other projects.

The openBSD kernel code was easiest to follow because it favored simplicity over all other things (improved security was just a byproduct).

For the record, the microkernels where hardest to follow despite having tons of books and a few experts nearby. But that's a whole different discussion