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Date: Tue, 15 Feb 2022 22:03:57 -0400 From: Jason Gunthorpe <jgg@...dia.com> To: Alistair Popple <apopple@...dia.com> Cc: Felix Kuehling <felix.kuehling@....com>, Christoph Hellwig <hch@....de>, David Hildenbrand <david@...hat.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, jglisse@...hat.com, willy@...radead.org Subject: Re: [PATCH v6 01/10] mm: add zone device coherent type memory support On Wed, Feb 16, 2022 at 12:23:44PM +1100, Alistair Popple wrote: > Device private and device coherent pages are not marked with pte_devmap and they > are backed by a struct page. The only way of inserting them is via migrate_vma. > The refcount is decremented in zap_pte_range() on munmap() with special handling > for device private pages. Looking at it again though I wonder if there is any > special treatment required in zap_pte_range() for device coherent pages given > they count as present pages. This is what I guessed, but we shouldn't be able to just drop pte_devmap on these pages without any other work?? Granted it does very little already.. I thought at least gup_fast needed to be touched or did this get handled by scanning the page list after the fact? Jason
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