On 09/10/2018 10:08 PM, David Rientjes wrote: > When Andrea brought this up, I suggested that the full solution would be a > MPOL_F_HUGEPAGE flag that could define thp allocation policy -- the added Can you elaborate on the semantics of this? You mean that a given vma could now have two mempolicies, where one would be for hugepages only? That's likely much more easy to suggest than to implement, with all uapi consequences... > benefit is that we could replace the thp "defrag" mode default by setting > this as part of default_policy. Right now, MADV_HUGEPAGE users are > concerned about (1) getting thp when system-wide it is not default and (2) > additional fault latency when direct compaction is not default. They are > not anticipating the degradation of remote access latency, so overloading > the meaning of the mode is probably not a good idea. >
