linux-kernel - Re: [PATCH] docs: tmpfs: update the huge folios policy for tmpfs and shmem fix

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Message-ID: <CAGsJ_4xvkcB6_g+RENBZ-G8aY7HZ4bdVGVgs2f8H7PSACtJrBw@mail.gmail.com>
Date: Thu, 21 Nov 2024 10:35:04 +1300
From: Barry Song <21cnbao@...il.com>
To: Baolin Wang <baolin.wang@...ux.alibaba.com>
Cc: akpm@...ux-foundation.org, da.gomez@...sung.com, david@...hat.com, 
	hughd@...gle.com, ioworker0@...il.com, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, ryan.roberts@....com, wangkefeng.wang@...wei.com, 
	willy@...radead.org
Subject: Re: [PATCH] docs: tmpfs: update the huge folios policy for tmpfs and
 shmem fix

On Wed, Nov 13, 2024 at 7:57 PM Baolin Wang
<baolin.wang@...ux.alibaba.com> wrote:
>
> Drop 'fadvise()' from the doc, since fadvise() has no HUGEPAGE advise
> currently.
>
> Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

Reviewed-by: Barry Song <baohua@...nel.org>

I couldn’t find any mention of HUGEPAGE in fadvise() either.

FADV_NORMAL
FADV_RANDOM
FADV_SEQUENTIAL
FADV_WILLNEED
FADV_DONTNEED
FADV_NOREUSE

> ---
>  Documentation/admin-guide/mm/transhuge.rst | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
>
> diff --git a/Documentation/admin-guide/mm/transhuge.rst b/Documentation/admin-guide/mm/transhuge.rst
> index ba6edff728ed..333958ef0d5f 100644
> --- a/Documentation/admin-guide/mm/transhuge.rst
> +++ b/Documentation/admin-guide/mm/transhuge.rst
> @@ -382,10 +382,10 @@ never
>
>  within_size
>      Only allocate huge page if it will be fully within i_size.
> -    Also respect fadvise()/madvise() hints;
> +    Also respect madvise() hints;
>
>  advise
> -    Only allocate huge pages if requested with fadvise()/madvise();
> +    Only allocate huge pages if requested with madvise();
>
>  Remember, that the kernel may use huge pages of all available sizes, and
>  that no fine control as for the internal tmpfs mount is available.
> @@ -438,10 +438,10 @@ never
>
>  within_size
>      Only allocate <size> huge page if it will be fully within i_size.
> -    Also respect fadvise()/madvise() hints;
> +    Also respect madvise() hints;
>
>  advise
> -    Only allocate <size> huge pages if requested with fadvise()/madvise();
> +    Only allocate <size> huge pages if requested with madvise();
>
>  Need of application restart
>  ===========================
> --
> 2.39.3
>