Preparing for user-space checkpoint/restore

Thanks. I will cite it here for convenience.
Description of the feature:
"Checkpoint/restart allows the state of a set of processes to be saved to persistent storage, then restarted at some future time, possibly on a different system."
Use cases:
"It has a number of potential uses, including fault-tolerant systems, debugging (it's a sort of "super core dump"), fast application startup, testing, and as a kind of "generic time machine." That last one allows for the important use case of checkpointing a game, then restoring it after a move which proves to be a mistake. Checkpoint/restart can also be used as a sort of application-level suspend feature; it can function as a kind of "smart swap" which can move an application entirely out of memory when the need arises. There is also the interesting prospect of saving a desktop session on a USB key, then restarting it on an entirely different system in a different location."