linux-kernel - Re: [PATCH v1 2/3] mm/rmap: convert page_move_anon_rmap() to folio_move_anon

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Message-ID: <CAJuCfpFZ_GRkCJRs2C7sa1k-L-vj7J4EaAtsyM4ECaG3=A+xEA@mail.gmail.com>
Date:   Tue, 3 Oct 2023 09:57:50 -0700
From:   Suren Baghdasaryan <surenb@...gle.com>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Muchun Song <muchun.song@...ux.dev>
Subject: Re: [PATCH v1 2/3] mm/rmap: convert page_move_anon_rmap() to folio_move_anon_rmap()

On Mon, Oct 2, 2023 at 7:29 AM David Hildenbrand <david@...hat.com> wrote:
>
> Let's convert it to consume a folio.
>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Thanks!

Reviewed-by: Suren Baghdasaryan <surenb@...gle.com>


> ---
>  include/linux/rmap.h |  2 +-
>  mm/huge_memory.c     |  2 +-
>  mm/hugetlb.c         |  2 +-
>  mm/memory.c          |  2 +-
>  mm/rmap.c            | 16 +++++++---------
>  5 files changed, 11 insertions(+), 13 deletions(-)
>
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index 064b432a4033..8034eda972e5 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -194,7 +194,7 @@ typedef int __bitwise rmap_t;
>  /*
>   * rmap interfaces called when adding or removing pte of page
>   */
> -void page_move_anon_rmap(struct page *, struct vm_area_struct *);
> +void folio_move_anon_rmap(struct folio *, struct vm_area_struct *);
>  void page_add_anon_rmap(struct page *, struct vm_area_struct *,
>                 unsigned long address, rmap_t flags);
>  void page_add_new_anon_rmap(struct page *, struct vm_area_struct *,
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index 01d0d65ece13..08245226ccb8 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -1505,7 +1505,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf)
>         if (folio_ref_count(folio) == 1) {
>                 pmd_t entry;
>
> -               page_move_anon_rmap(page, vma);
> +               folio_move_anon_rmap(folio, vma);
>                 SetPageAnonExclusive(page);
>                 folio_unlock(folio);
>  reuse:
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 24591fc145ff..e52c6048e74f 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -5461,7 +5461,7 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
>          */
>         if (folio_mapcount(old_folio) == 1 && folio_test_anon(old_folio)) {
>                 if (!PageAnonExclusive(&old_folio->page)) {
> -                       page_move_anon_rmap(&old_folio->page, vma);
> +                       folio_move_anon_rmap(old_folio, vma);
>                         SetPageAnonExclusive(&old_folio->page);
>                 }
>                 if (likely(!unshare))
> diff --git a/mm/memory.c b/mm/memory.c
> index 9de231c92769..1f0e3317cbdd 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -3483,7 +3483,7 @@ static vm_fault_t do_wp_page(struct vm_fault *vmf)
>                  * and the folio is locked, it's dark out, and we're wearing
>                  * sunglasses. Hit it.
>                  */
> -               page_move_anon_rmap(vmf->page, vma);
> +               folio_move_anon_rmap(folio, vma);
>                 SetPageAnonExclusive(vmf->page);
>                 folio_unlock(folio);
>  reuse:
> diff --git a/mm/rmap.c b/mm/rmap.c
> index 854ccbd66954..37f05f33559b 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -1141,19 +1141,17 @@ int folio_total_mapcount(struct folio *folio)
>  }
>
>  /**
> - * page_move_anon_rmap - move a page to our anon_vma
> - * @page:      the page to move to our anon_vma
> - * @vma:       the vma the page belongs to
> + * folio_move_anon_rmap - move a folio to our anon_vma
> + * @page:      The folio to move to our anon_vma
> + * @vma:       The vma the folio belongs to
>   *
> - * When a page belongs exclusively to one process after a COW event,
> - * that page can be moved into the anon_vma that belongs to just that
> - * process, so the rmap code will not search the parent or sibling
> - * processes.
> + * When a folio belongs exclusively to one process after a COW event,
> + * that folio can be moved into the anon_vma that belongs to just that
> + * process, so the rmap code will not search the parent or sibling processes.
>   */
> -void page_move_anon_rmap(struct page *page, struct vm_area_struct *vma)
> +void folio_move_anon_rmap(struct folio *folio, struct vm_area_struct *vma)
>  {
>         void *anon_vma = vma->anon_vma;
> -       struct folio *folio = page_folio(page);
>
>         VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
>         VM_BUG_ON_VMA(!anon_vma, vma);
> --
> 2.41.0
>