On 04/24/2017 03:03 PM, Andi Kleen wrote: > 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. Yep, that's what I meant. It used to work like that and it still works like that on NetBSD, for example. Although it has apparently been a long time since it changed [1]. > Now it just gives up, which means every user has to implement > their own search. Correct. And the resulting code is usually ugly and inefficient [2]. > 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. I'm not sure whether I understand what that means. Thanks, Adrian > [1] http://lkml.iu.edu/hypermail/linux/kernel/0305.2/0828.html > [2] https://hg.mozilla.org/mozilla-central/rev/dfaafbaaa291 -- .''`. John Paul Adrian Glaubitz : :' : Debian Developer - glaubitz@xxxxxxxxxx `. `' Freie Universitaet Berlin - glaubitz@xxxxxxxxxxxxxxxxxxx `- GPG: 62FF 8A75 84E0 2956 9546 0006 7426 3B37 F5B5 F913
