One of my favorite examples of userfaultfd: transparently mapping databases on cloud storage into RAM.

https://tech.nextroll.com/blog/data/2016/11/29/traildb-mmap-...

Could something like this enable SSI distributed computing entirely in user space? Is it practical to run some sort of distributed shared memory, relying on user-managed page faults to ensure coherence?

Thanks for sharing! I am still proud of this hack :)