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Date: Sun, 22 Nov 2020 15:30:30 +0200 From: Mike Rapoport <rppt@...nel.org> To: David Hildenbrand <david@...hat.com> Cc: Michal Hocko <mhocko@...e.com>, Muchun Song <songmuchun@...edance.com>, 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, willy@...radead.org, osalvador@...e.de, song.bao.hua@...ilicon.com, duanxiongchun@...edance.com, linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, linux-fsdevel@...r.kernel.org Subject: Re: [PATCH v5 21/21] mm/hugetlb: Disable freeing vmemmap if struct page size is not power of two On Fri, Nov 20, 2020 at 10:15:30AM +0100, David Hildenbrand wrote: > On 20.11.20 09:25, Michal Hocko wrote: > > On Fri 20-11-20 14:43:25, Muchun Song wrote: > > > We only can free the unused vmemmap to the buddy system when the > > > size of struct page is a power of two. > > > > Can we actually have !power_of_2 struct pages? > > AFAIK multiples of 8 bytes (56, 64, 72) are possible. Or multiples of 4 for 32-bit (28, 32, 36). > -- > Thanks, > > David / dhildenb > > -- Sincerely yours, Mike.
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