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

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Date:   Wed, 7 Dec 2022 15:45:24 -0800
From:   Vishal Moola <vishal.moola@...il.com>
To:     Matthew Wilcox <willy@...radead.org>
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 7, 2022 at 3:09 PM Matthew Wilcox <willy@...radead.org> wrote:
>
> 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.

Yeah, I'll do that. Many other callers will benefit from it later as well.

> > @@ -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?

Oops, that page_mapcount() should have been replaced
with a folio_mapcount(). It appears I accidentally removed it.