linux-ext4 - Re: [PATCH v9 04/14] mm: handling Non-LRU pages returned by vm_normal

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Date:   Mon, 18 Jul 2022 12:51:23 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Alex Sierra <alex.sierra@....com>, jgg@...dia.com
Cc:     Felix.Kuehling@....com, 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, akpm@...ux-foundation.org
Subject: Re: [PATCH v9 04/14] mm: handling Non-LRU pages returned by
 vm_normal_pages

On 15.07.22 17:05, Alex Sierra wrote:
> With DEVICE_COHERENT, we'll soon have vm_normal_pages() return
> device-managed anonymous pages that are not LRU pages. Although they
> behave like normal pages for purposes of mapping in CPU page, and for
> COW. They do not support LRU lists, NUMA migration or THP.
> 
> Callers to follow_page() currently don't expect ZONE_DEVICE pages,
> however, with DEVICE_COHERENT we might now return ZONE_DEVICE. Check
> for ZONE_DEVICE pages in applicable users of follow_page() as well.
> 
> Signed-off-by: Alex Sierra <alex.sierra@....com>
> Acked-by: Felix Kuehling <Felix.Kuehling@....com> (v2)
> Reviewed-by: Alistair Popple <apopple@...dia.com> (v6)
>

Acked-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb