[jzm2k]

Yes it's very readable and easy to understand. I had made a huge design mistake in my OS's scheduling which basically prevented any task from going to sleep but it was hard to understand what other way was there to do it. Reading xv6's source code saved me (and my OS) as the code was so clean that it was easy to understand the idea behind their scheduling and port that to another kernel that had otherwise nothing to do with xv6.