linux-kernel - Re: [PATCH v2 1/3] madvise: Convert madvise_cold_or_pageout_pte

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Message-ID: <Y5EdR1l1Ho3FyrY3@casper.infradead.org>
Date:   Wed, 7 Dec 2022 23:09:59 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Vishal Moola (Oracle)" <vishal.moola@...il.com>
Cc:     linux-mm@...ck.org, damon@...ts.linux.dev,
        linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
        sj@...nel.org
Subject: Re: [PATCH v2 1/3] madvise: Convert
 madvise_cold_or_pageout_pte_range() to use folios

On Wed, Dec 07, 2022 at 03:01:50PM -0800, Vishal Moola (Oracle) wrote:
> @@ -424,28 +425,29 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
>  		page = vm_normal_page(vma, addr, ptent);
>  		if (!page || is_zone_device_page(page))
>  			continue;
> +		folio = page_folio(page);

Maybe we should add a vm_normal_folio() first?  That way we could get
rid of the 'struct page' in this function entirely.

> @@ -453,13 +455,13 @@ static int madvise_cold_or_pageout_pte_range(pmd_t *pmd,
>  		}
>  
>  		/*
> -		 * Do not interfere with other mappings of this page and
> -		 * non-LRU page.
> +		 * Do not interfere with other mappings of this folio and
> +		 * non-LRU folio.
>  		 */
> -		if (!PageLRU(page) || page_mapcount(page) != 1)
> +		if (!folio_test_lru(folio))

Why has the test for folio_mapcount() disappeared?