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Message-ID: <20220215144524.GR4160@nvidia.com> Date: Tue, 15 Feb 2022 10:45:24 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: David Hildenbrand <david@...hat.com> Cc: Felix Kuehling <felix.kuehling@....com>, Alex Sierra <alex.sierra@....com>, akpm@...ux-foundation.org, linux-mm@...ck.org, rcampbell@...dia.com, linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, hch@....de, jglisse@...hat.com, apopple@...dia.com, willy@...radead.org Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support On Tue, Feb 15, 2022 at 01:16:43PM +0100, David Hildenbrand wrote: > > fact, the first version of our patches attempted to add migration > > support to DEVICE_GENERIC. But we were convinced to create a new > > ZONE_DEVICE page type for our use case instead. > > Do you know if DEVICE_GENERIC pages would end up as PageAnon()? My > assumption was that they would be part of a special mapping. We need to stop using the special PTEs and VMAs for things that have a struct page. This is a mistake DAX created that must be undone. Jason
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