Demo: What We Already Know

Two demos for the recap, both about what lecture 03 ended with: allocation is a change to the list of areas, and malloc() makes it through brk() or mmap().

Demo	What it shows
memory-ops/	Four megabytes allocated in one call and in a thousand, with malloc() and with mmap(), under pmap: a new area, a larger area, a merged area.
malloc-size/	The same two shapes under strace: one mmap() for the single call, thirty-five brk()s for the thousand.

Both wait at prompts, for a second terminal.