This is the general todo list for the page_replace work:
* port the page replace policy code to -mm this includes adding some abstractions in order to accommodate the swap migration work of christoph lameter.
* port the CART policies (with and without cyclic extension) to the shiny new policy framework.
* come up with good benchmarks showing both:
1. that the new code doesn't degrade performance; and
1. that it does improve the expected scenarios.
* document it.
* have I mentioned benchmarks?
* trick andrew to accept the patches.
