Real-World tests:
	ls.prf		- simple ls on a small directory
	gedit.prf	- starting gedit
	ooo.prf         - starting OO.o
	pagein-*.prf    - before & after a sort by inode optimisation.

Constructed tests:
gedit.prf
	minimal.prf	- a map & a touch.
	twomaps.prf	- two maps, two touches
	remap.prf	- map, unmap, map
	overlap.prf	- more complex re-mapping / overlapping test
