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[2003:cb:c73f:e900:3b0d:87a6:2953:20d1]) by smtp.gmail.com with ESMTPSA id m9-20020a5d56c9000000b00313e2abfb8dsm15804076wrw.92.2023.07.25.02.09.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 25 Jul 2023 02:09:43 -0700 (PDT) Message-ID: Date: Tue, 25 Jul 2023 11:09:42 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.13.0 Subject: Re: [PATCH] docs: mm: Fix number of base pages for 1GB HugeTLB To: Usama Arif , songmuchun@bytedance.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, fam.zheng@bytedance.com, liangma@liangbit.com References: <20230207114456.2304801-1-usama.arif@bytedance.com> From: David Hildenbrand Organization: Red Hat In-Reply-To: <20230207114456.2304801-1-usama.arif@bytedance.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 7D06A1C000F X-Stat-Signature: tkaiqejwgfjb438ir6mec7do89qf1afq X-Rspam-User: X-HE-Tag: 1690276188-94005 X-HE-Meta: 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 kUD3XthP NDAV8HBHBTpAiFuAQkiR74dxbodIMStz/vcOKm87WF+tBhlqAXqfbvBQHtSoQXnKA3YMc5XWeYfI2+ClJuXIjbMoRLzNjUYKdfeEvGA9Cn+LAqiMZgrWul1l8LiKE0RFYu93OEEy3dKUI0M2MtjGu+lv2fFtQg51eC5cymRHiVJuHw7yTJvEXcQHoi1QcsPGApTaFiUhwPsWMEbwOrUOvypvv2W6ZHIIs3lErkPm0dxosvReTqkANSWYhcsWG17+1iohHeGyCfrePfyQpSywLERAx8JU9ouujOPlgt7UCzWTgAiYwKEjBkPP3rAuSlGNMQGcSNS8mS2TMd4Pl/5Gqt7wAUxZgpZnbCUapD06gHOufMjqJvF5s+aroMOBiMwFEJ0u9Pef8tr8sc/NidFt1Qz0OgDcr3P/9sIDQjlOilYbQvkvGmxzZpd4b0/xy8uK/Hvxy+KT3DtaQuNoLBKW8Mf88mw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.131966, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On 07.02.23 12:44, Usama Arif wrote: > 1GB HugeTLB page consists of 262144 base pages. > > Signed-off-by: Usama Arif > --- > 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 -- Cheers, David / dhildenb