It's also worth mentioning that being conservative only on the stack, even when moving, is often good enough. SBCL still works that way, and the space and time

It's also worth mentioning that being conservative only on the stack, even when moving, is often good enough. SBCL still works that way, and the space and time overheads are pretty tiny [0]. [0] Fast conservative garbage collection https://users.cecs.anu.edu.au/~steveb/pubs/papers/consrc-oopsla-2014.pdf https://users.cecs.anu.edu.au/~steveb/pubs/papers/consrc-oop...