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Date: Tue, 15 Sep 2020 15:32:41 +0100 From: Matthew Wilcox <willy@...radead.org> To: Muchun Song <songmuchun@...edance.com> Cc: corbet@....net, mike.kravetz@...cle.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, x86@...nel.org, hpa@...or.com, dave.hansen@...ux.intel.com, luto@...nel.org, peterz@...radead.org, viro@...iv.linux.org.uk, akpm@...ux-foundation.org, paulmck@...nel.org, mchehab+huawei@...nel.org, pawan.kumar.gupta@...ux.intel.com, rdunlap@...radead.org, oneukum@...e.com, anshuman.khandual@....com, jroedel@...e.de, almasrymina@...gle.com, rientjes@...gle.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org Subject: Re: [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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