linux-ext4 - Re: [PATCH v6 01/10] mm: add zone device coherent type memory support

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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