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SubjectRe: [RFC PATCH 00/24] mm/hugetlb: Free some vmemmap pages of hugetlb page
On Tue, Sep 15, 2020 at 08:59:23PM +0800, Muchun Song wrote:
> This patch series will free some vmemmap pages(struct page structures)
> associated with each hugetlbpage when preallocated to save memory.

It would be lovely to be able to do this. Unfortunately, it's completely
impossible right now. Consider, for example, get_user_pages() called
on the fifth page of a hugetlb page.

I've spent a lot of time thinking about this, and there's a lot of work
that needs to happen before we can do this, mostly in device drivers.
Do you want to help? It's a multi-year project.

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