Re: [RFC PATCH 00/24] mm/hugetlb: Free some vmemmap pages of hugetlb page

[Dave Hansen]

On 9/15/20 7:32 AM, Matthew Wilcox wrote:
> 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.

Yeah, exactly.

Does this series survive the in-kernel selftests/?  If so, sounds like
we need to add a new selftest.