linux-kernel - Re: [PATCH] mm: folio_zero_user: (fixup) cache neighbouring pages

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Message-ID: <877btssz5b.fsf@oracle.com>
Date: Wed, 07 Jan 2026 16:53:36 -0800
From: Ankur Arora <ankur.a.arora@...cle.com>
To: Ankur Arora <ankur.a.arora@...cle.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org,
        akpm@...ux-foundation.org, david@...nel.org, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
        mjguzik@...il.com, luto@...nel.org, peterz@...radead.org,
        tglx@...utronix.de, willy@...radead.org, raghavendra.kt@....com,
        chleroy@...nel.org, ioworker0@...il.com, lizhe.67@...edance.com,
        boris.ostrovsky@...cle.com, konrad.wilk@...cle.com
Subject: Re: [PATCH] mm: folio_zero_user: (fixup) cache neighbouring pages


Hi Andrew,

Sorry, please ignore this patch.

Thanks
Ankur

Ankur Arora <ankur.a.arora@...cle.com> writes:

> Constify the unit computation. Also, cleans up the comment
> a little bit.
>
> Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
> ---
>  mm/memory.c | 20 ++++++++++----------
>  1 file changed, 10 insertions(+), 10 deletions(-)
>
> diff --git a/mm/memory.c b/mm/memory.c
> index 11ad1db61929..95dc21ca120f 100644
> --- a/mm/memory.c
> +++ b/mm/memory.c
> @@ -7240,19 +7240,19 @@ static inline int process_huge_page(
>  static void clear_contig_highpages(struct page *page, unsigned long addr,
>  				   unsigned int nr_pages)
>  {
> -	unsigned int i, unit, count;
> -
> -	might_sleep();
> +	unsigned int i, count;
>  	/*
> -	 * When clearing we want to operate on the largest extent possible since
> -	 * that allows for extent based architecture specific optimizations.
> +	 * When clearing we want to operate on the largest extent possible to
> +	 * allow for for architecture specific extent based optimizations.
>  	 *
> -	 * However, since the clearing interfaces (clear_user_highpages(),
> -	 * clear_user_pages(), clear_pages()), do not call cond_resched(), we
> -	 * limit the batch size when running under non-preemptible scheduling
> -	 * models.
> +	 * However, since clear_user_highpages() (and primitives clear_user_pages(),
> +	 * clear_pages()), do not call cond_resched(), limit the unit size when
> +	 * running under non-preemptible scheduling models.
>  	 */
> -	unit = preempt_model_preemptible() ? nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH;
> +	const unsigned int unit = preempt_model_preemptible() ?
> +				   nr_pages : PROCESS_PAGES_NON_PREEMPT_BATCH;
> +
> +	might_sleep();
>
>  	for (i = 0; i < nr_pages; i += count) {
>  		cond_resched();


--
ankur