hw-4-xv6-lazy-page-allocation.md

Homework: xv6 lazy page allocation

Part One: Eliminate allocation from sbrk()

Page fault occurs because shell calls malloc system call in runcmd function, which calls sbrk system call underground.

Part Two: Lazy allocation

https://github.com/WLBF/xv6-public/commit/ce445cf982c57aacc9bf5a16972d5de473c19de2