Re: [PATCH RFC] mm/madvise: introduce MADV_POPULATE to prefault/prealloc memory

David Hildenbrand
2021-02-20T09:03:22Z

> Sorry, for jumping in late ... hugetlb keyword just hit my mail filters :)
>

Sorry for not realizing to cc you before I sent out the man page update :)

> Yes, it is true that hugetlb reservations are not numa aware. So, even if
> pages are reserved at mmap time one could still SIGBUS if a fault is
> restricted to a node with insufficient pages.
>
> I looked into this some years ago, and there really is not a good way to
> make hugetlb reservations numa aware. preallocation, or on demand
> populating as proposed here is a way around the issue.

Thanks for confirming, this makes a lot of sense to me now.

--
Thanks,

David / dhildenb