> Can you explain what the issue is? What used to work on Linux and > doesn't any more? The man page is quite clear: In old Linux hint was a search hint, so if there isn't a hole at the hinted area it will search starting from there for a hole instead of giving up immediately. Now it just gives up, which means every user has to implement their own search. Yes I ran into the same problem and it's annoying. It broke originally when top down mmap was added I believe Before the augmented rbtree it was potentially very expensive, but now it should be cheap. -Andi