linux-kernel - Re: [PATCH] mm: damon: Use HPAGE_PMD

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Date:   Tue, 17 May 2022 08:44:16 -0700
From:   SeongJae Park <sj@...nel.org>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>
Cc:     SeongJae Park <sj@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: damon: Use HPAGE_PMD_SIZE

Hi Kefeng,

On Tue, 17 May 2022 22:51:20 +0800 Kefeng Wang <wangkefeng.wang@...wei.com> wrote:

> Using HPAGE_PMD_SIZE instead of open code.
> 
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>

Reviewed-by: SeongJae Park <sj@...nel.org>


Thanks,
SJ

> ---
>  mm/damon/ops-common.c | 3 +--
>  mm/damon/paddr.c      | 2 +-
>  mm/damon/vaddr.c      | 2 +-
>  3 files changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
> index e346cc10d143..10ef20b2003f 100644
> --- a/mm/damon/ops-common.c
> +++ b/mm/damon/ops-common.c
> @@ -73,8 +73,7 @@ void damon_pmdp_mkold(pmd_t *pmd, struct mm_struct *mm, unsigned long addr)
>  	}
>  
>  #ifdef CONFIG_MMU_NOTIFIER
> -	if (mmu_notifier_clear_young(mm, addr,
> -				addr + ((1UL) << HPAGE_PMD_SHIFT)))
> +	if (mmu_notifier_clear_young(mm, addr, addr + HPAGE_PMD_SIZE))
>  		referenced = true;
>  #endif /* CONFIG_MMU_NOTIFIER */
>  
> diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
> index 21474ae63bc7..b40ff5811bb2 100644
> --- a/mm/damon/paddr.c
> +++ b/mm/damon/paddr.c
> @@ -106,7 +106,7 @@ static bool __damon_pa_young(struct folio *folio, struct vm_area_struct *vma,
>  			result->accessed = pmd_young(*pvmw.pmd) ||
>  				!folio_test_idle(folio) ||
>  				mmu_notifier_test_young(vma->vm_mm, addr);
> -			result->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
> +			result->page_sz = HPAGE_PMD_SIZE;
>  #else
>  			WARN_ON_ONCE(1);
>  #endif	/* CONFIG_TRANSPARENT_HUGEPAGE */
> diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
> index 9a56ff60f244..5767be72c181 100644
> --- a/mm/damon/vaddr.c
> +++ b/mm/damon/vaddr.c
> @@ -443,7 +443,7 @@ static int damon_young_pmd_entry(pmd_t *pmd, unsigned long addr,
>  		if (pmd_young(*pmd) || !page_is_idle(page) ||
>  					mmu_notifier_test_young(walk->mm,
>  						addr)) {
> -			*priv->page_sz = ((1UL) << HPAGE_PMD_SHIFT);
> +			*priv->page_sz = HPAGE_PMD_SIZE;
>  			priv->young = true;
>  		}
>  		put_page(page);
> -- 
> 2.35.3