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

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Date:   Tue, 25 Jul 2023 11:09:42 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Usama Arif <usama.arif@...edance.com>, songmuchun@...edance.com
Cc:     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 07.02.23 12:44, Usama Arif wrote:
> 1GB HugeTLB page consists of 262144 base pages.
> 
> Signed-off-by: Usama Arif <usama.arif@...edance.com>
> ---
>   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

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Cheers,

David / dhildenb