Managing multicore memory

They wait until almost the end to tell us why this isn't really such a great idea:

Mars cautions that a system like Jigsaw dispenses with a layer of abstraction between chip hardware and the software running on it. “Companies like Intel, once they expose the microarchitectural configurations through the software layer, they have to keep that interface over future generations of the processor,” Mars says. “So if Intel wanted to do something audacious with the microarchitecture to make a big change, they’ll have to keep that legacy support around, which can limit the design options they can explore.”