I dunno about procfs, but one Linux implementation of https://en.wikipedia.org/wiki/Application_checkpointing is http://cryopid.berlios.de/ or apparently http://dmtcp.sourceforge.net/

There has been a whole bunch of approaches to this over the years, some of them kernel level and others in user space.

Search for "checkpoint restart" to find some links or start here: http://checkpointing.org/ It's all pretty dated though.

I did some work on it years ago but it's no longer maintained http://www.science.uva.nl/research/scs/Software/ckpt/ckpt.ht...