linux-kernel - Re: [PATCH] docs: mm: Fix number of base pages for 1GB HugeTLB

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Date:   Wed, 8 Feb 2023 11:51:12 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Usama Arif <usama.arif@...edance.com>
Cc:     songmuchun@...edance.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org,
        fam.zheng@...edance.com, liangma@...ngbit.com
Subject: Re: [PATCH] docs: mm: Fix number of base pages for 1GB HugeTLB

On Tue, Feb 07, 2023 at 11:44:56AM +0000, Usama Arif wrote:
> 1GB HugeTLB page consists of 262144 base pages.
> 
> Signed-off-by: Usama Arif <usama.arif@...edance.com>

Acked-by: Mike Rapoport (IBM) <rppt@...nel.org>

> ---
>  Documentation/mm/vmemmap_dedup.rst | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/mm/vmemmap_dedup.rst b/Documentation/mm/vmemmap_dedup.rst
> index a4b12ff906c4..689a6907c70b 100644
> --- a/Documentation/mm/vmemmap_dedup.rst
> +++ b/Documentation/mm/vmemmap_dedup.rst
> @@ -1,3 +1,4 @@
> +
>  .. SPDX-License-Identifier: GPL-2.0
>  
>  =========================================
> @@ -17,7 +18,7 @@ HugeTLB pages consist of multiple base page size pages and is supported by many
>  architectures. See Documentation/admin-guide/mm/hugetlbpage.rst for more
>  details. On the x86-64 architecture, HugeTLB pages of size 2MB and 1GB are
>  currently supported. Since the base page size on x86 is 4KB, a 2MB HugeTLB page
> -consists of 512 base pages and a 1GB HugeTLB page consists of 4096 base pages.
> +consists of 512 base pages and a 1GB HugeTLB page consists of 262144 base pages.
>  For each base page, there is a corresponding ``struct page``.
>  
>  Within the HugeTLB subsystem, only the first 4 ``struct page`` are used to
> -- 
> 2.25.1
> 

-- 
Sincerely yours,
Mike.