Re: [RFC PATCH 0/3] hugetlb: add demote/split page functionality

[David Hildenbrand]

> I need to take a close look at Oscar's patches.  Too many thing to look
> at/review :)
>
> This series does take into account gigantic pages allocated in CMA.
> Such pages can be demoted, and we need to track that they need to go
> back to CMA.  Nothing super special for this, mostly a new hugetlb
> specific flag to track such pages.

Ah, just spotted it - patch #2 :)

Took me a while to figure out that we end up calling 
cma_declare_contiguous_nid() with order_per_bit=0 - would have thought 
we would be using the actual smallest allocation order we end up using 
for huge/gigantic pages via CMA. Well, this way it "simply works".

--
Thanks,

David / dhildenb