[$] CRIB: checkpoint/restore in BPF

The desire for the ability to checkpoint a process - to record its state ina form that can be restarted at a future time - on Linux is almost as old asLinux itself. See, for example, this announcement of a checkpointproject that appeared in LWN in 1998. While working solutions exist, theycan be somewhat fragile and difficult to use; it is not surprising thatsome people are interested in finding a better alternative. A currenteffort goes by the name CRIB,for Checkpoint/Restore in (naturally) BPF. It is far from clear that CRIBwill replace the existing solutions, but it is an interesting look at adifferent way of solving the problem.