linux-kernel - Re: [PATCH HOTFIX 6.17] mm/mremap: avoid expensive folio lookup on mremap folio pte batch

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Message-ID: <44956337-9162-4831-8f59-e4abd80cc683@lucifer.local>
Date: Thu, 7 Aug 2025 22:01:45 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: David Hildenbrand <david@...hat.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
        "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Vlastimil Babka <vbabka@...e.cz>, Jann Horn <jannh@...gle.com>,
        Pedro Falcato <pfalcato@...e.de>, Barry Song <baohua@...nel.org>,
        Dev Jain <dev.jain@....com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Ryan Roberts <ryan.roberts@....com>
Subject: Re: [PATCH HOTFIX 6.17] mm/mremap: avoid expensive folio lookup on
 mremap folio pte batch

On Thu, Aug 07, 2025 at 09:11:12PM +0100, Lorenzo Stoakes wrote:
> Right except you're ignoring A/D bits no? Or what's the point of
> folio_pte_batch()?
>
> Why don't they matter here? I thought they did?

(Discussed with David off-list - it turns out get_and_clear_ptes() handles this
anyway, so it's not a concern).