So this is a choice made by the user? Or the choice is made automatically using some heuristic? Regardless: I don't really see the point of avoiding moving gc

So this is a choice made by the user? Or the choice is made automatically using some heuristic? Regardless: I don't really see the point of avoiding moving gc if you have to have barriers. Moving gc will be faster; the only reason I can think of for avoiding it is to avoid mutator overhead, but you are paying barriers anyway.