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

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Date:   Tue, 29 Nov 2022 20:37:29 -0800
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Peter Xu <peterx@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        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>,
        David Hildenbrand <david@...hat.com>
Subject: Re: [PATCH 02/10] mm/hugetlb: Don't wait for migration entry during
 follow page

On 11/29/22 14:35, 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.

Makes sense.  I like the consistency.

> 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).
> 
> Signed-off-by: Peter Xu <peterx@...hat.com>
> ---
>  mm/hugetlb.c | 11 -----------
>  1 file changed, 11 deletions(-)

Thanks!

Reviewed-by: Mike Kravetz <mike.kravetz@...cle.com>
-- 
Mike Kravetz