Comment by plutaniano

I'm working my way through this[1] operating systems book and a few of the exercises[2] require customizing and compiling Xv6. It's so cool to code your own scheduler or syscall and see it working on a actual OS.

[1] https://pages.cs.wisc.edu/~remzi/OSTEP/ [2] https://github.com/remzi-arpacidusseau/ostep-projects