This stuff is still all confused

Read http://catern.com/rsys21.pdf

What you want is:

1. create "embryonic" unscheduled process

2. Set it up from the parent process, it just lies on the operating table passively.

3. Submit it to the scheduler.

This is just....obviously correct. Totally flexible. Totally efficient. Hell, if you really want to fork anything, fork those embryonic process which have no active threads! Much safer and easier to understand!

I did not write the paper above, but I did write

https://lore.kernel.org/lkml/f8457e20-c3cc-6e56-96a4-3090d7d...

https://lists.freebsd.org/archives/freebsd-arch/2022-January...

I hope I or someone else will have time to make it happen!