@millihertz Overcommitting RAM and optimizing cache use is a nice thing I think, so i don't want to run without swap, but it would definitely be cool if GCs and virtual memory could cooperate better.

I read recently that systemd is gaining the capability to politely ask processes (i.e. send an event) to reduce their RAM use, that's pretty cool (insert side note about ways that systemd is uncool).

How cache-oblivious are GCs these days generally? Can they discard memory without first paging it all in again?