| Date | Tue, 15 Sep 2020 15:32:41 +0100 | From | Matthew Wilcox <> | Subject | Re: [RFC PATCH 00/24] mm/hugetlb: Free some vmemmap pages of hugetlb page |
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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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