linux-kernel - Re: [PATCH 02/10] mm/hugetlb: Don't wait for migration entry during follow page

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Date:   Wed, 30 Nov 2022 11:15:56 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Peter Xu <peterx@...hat.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     James Houghton <jthoughton@...gle.com>,
        Jann Horn <jannh@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Rik van Riel <riel@...riel.com>,
        Nadav Amit <nadav.amit@...il.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Muchun Song <songmuchun@...edance.com>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: Re: [PATCH 02/10] mm/hugetlb: Don't wait for migration entry during
 follow page

On 29.11.22 20:35, Peter Xu wrote:
> That's what the code does with !hugetlb pages, so we should logically do
> the same for hugetlb, so migration entry will also be treated as no page.
> 
> This is probably also the last piece in follow_page code that may sleep,
> the last one should be removed in cf994dd8af27 ("mm/gup: remove
> FOLL_MIGRATION", 2022-11-16).

We only have a handful of follow_page() calls left. Most relevant for 
hugetlb should only be the ones from mm/migrate.c.

So this is now just consistent with ordinary pages/THP.

Happy so see that gone.

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

-- 
Thanks,

David / dhildenb