[Ask HN] How To Prepare For Google/Facebook System Interview?

I am talking about Linux/Unix based system internals interview. Currently, I am focusing on two parts.

1. Theoretical Questions - Like the process, mmu, CPU etc. 2. Troubleshooting Questions - how does ls work?, Unable to create new process etc.

Can someone recommend me any books or blogs to prepare for my interview? Currently, I am following Robert Love's Linux Kernel Development book.