linux-kernel - Re: [PATCH] mm/damon/vaddr: remove swap

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Date:   Thu, 11 Nov 2021 11:37:36 +0800
From:   Muchun Song <songmuchun@...edance.com>
To:     Yihao Han <hanyihao@...o.com>
Cc:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, kernel@...o.com
Subject: Re: [PATCH] mm/damon/vaddr: remove swap_ranges() and replace it with swap()

On Thu, Nov 11, 2021 at 11:22 AM Yihao Han <hanyihao@...o.com> wrote:
>
> Remove 'swap_ranges()' and replace it with the macro 'swap()'
> defined in 'include/linux/minmax.h' to simplify code and improve efficiency
>
> Reviewed-by: SeongJae Park <sj@...nel.org>
> Reviewed-by: Muchun Song <songmuchun@...edance.com>
> Signed-off-by: Yihao Han <hanyihao@...o.com>

Actually, I and SeongJae didn't provide Reviewed-by in the
previous thread. But this patch looks good to me, so

Reviewed-by: Muchun Song <songmuchun@...edance.com>

BTW, the subject missed a "v2" tag (and changes log
should include what you have changed since v1).

Thanks.

> ---
>  mm/damon/vaddr.c | 16 +++-------------
>  1 file changed, 3 insertions(+), 13 deletions(-)
>
> diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
> index 35fe49080ee9..814dc811d7c4 100644
> --- a/mm/damon/vaddr.c
> +++ b/mm/damon/vaddr.c
> @@ -97,16 +97,6 @@ static unsigned long sz_range(struct damon_addr_range *r)
>         return r->end - r->start;
>  }
>
> -static void swap_ranges(struct damon_addr_range *r1,
> -                       struct damon_addr_range *r2)
> -{
> -       struct damon_addr_range tmp;
> -
> -       tmp = *r1;
> -       *r1 = *r2;
> -       *r2 = tmp;
> -}
> -
>  /*
>   * Find three regions separated by two biggest unmapped regions
>   *
> @@ -145,9 +135,9 @@ static int __damon_va_three_regions(struct vm_area_struct *vma,
>                 gap.start = last_vma->vm_end;
>                 gap.end = vma->vm_start;
>                 if (sz_range(&gap) > sz_range(&second_gap)) {
> -                       swap_ranges(&gap, &second_gap);
> +                       swap(gap, second_gap);
>                         if (sz_range(&second_gap) > sz_range(&first_gap))
> -                               swap_ranges(&second_gap, &first_gap);
> +                               swap(second_gap, first_gap);
>                 }
>  next:
>                 last_vma = vma;
> @@ -158,7 +148,7 @@ static int __damon_va_three_regions(struct vm_area_struct *vma,
>
>         /* Sort the two biggest gaps by address */
>         if (first_gap.start > second_gap.start)
> -               swap_ranges(&first_gap, &second_gap);
> +               swap(first_gap, second_gap);
>
>         /* Store the result */
>         regions[0].start = ALIGN(start, DAMON_MIN_REGION);
> --
> 2.17.1
>