What are “jetsam priorities”?

Question

Can someone explain what "jetsam priorities" are?

They are something that is enforced by launchd. I suspect that they are a way of throttling down the CPU for a particular process, but I don't know for sure.

Answer 1

Looking at the source file found when googling for "jetsam priority", I find jetsam_kill_top_proc(), which indicates it's used to jettison (kill) processes when memory runs low.