Re: [PATCH 21/46] hugetlb: use struct hugetlb_pte for walk_hugetlb_range

[Peter Xu]

On Thu, Jan 12, 2023 at 04:17:52PM -0500, James Houghton wrote:
> I'll look into it, but doing it this way will use _mapcount, so we
> won't be able to use the vmemmap optimization. I think even if we do
> use Hugh's approach, refcount is still being kept on the head page, so
> there's still an overflow risk there (but maybe I am
> misunderstanding).

Could you remind me what's the issue if using refcount on the small pages
rather than the head (assuming vmemmap still can be disabled)?

Thanks,

-- 
Peter Xu