No offense to Azul, but that looks sort of like them just trying to get their kernel patches into the main linux kernel for ease of deployment.
Having a pluggable scheduler and memory management module might be nice for other pauseless GCs too, but not sure how that relates to any patents Azul may hold in this area, for instance: https://www.google.com/patents/US8452938?dq=ininventor:%22Gi...
Per https://groups.google.com/forum/#!topic/mechanical-sympathy/... the Linux kernel types had no interest in incorporating it (it requires some things like bulk page table changes with only one clearing of the TBL at the end).