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bh=xE2QtHnNlY4p46ZdnYaxlkn6amrvbqwlWSdnNmpJ+Pk=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=FZl+W5DSpv4oPiT7JEccqxA+H6j7G50xyqSyHDub/Z0dz7a5WZCtRz48lF2pjzB19 zS4YIqLJF+/zY1NYAeiD+TAprcmklnwUUF4mc/HotKIlYBoVezBJxI8a4Fd1GnOIis 2uouv7czkXv/fUfI9lOTJpgYal6iAs5IqVCYXK35zjismd0R+0o+R75JzkWPHVFjxu x+2HFgCQxInj76sPUefS1+nuPx2+qd5O9lurQZxAIC+dla1SMcmKedawMZoE97viIn 8gpNO9vlKAT5cTIEEIEet3lLi1ue8yRZBcK5Vmt9B/o004sUCpbuK1WHcvnf7AriNp X/PQab/8HT8Og== Date: Wed, 8 Feb 2023 11:51:12 +0200 From: Mike Rapoport To: Usama Arif Cc: songmuchun@bytedance.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, fam.zheng@bytedance.com, liangma@liangbit.com Subject: Re: [PATCH] docs: mm: Fix number of base pages for 1GB HugeTLB Message-ID: References: <20230207114456.2304801-1-usama.arif@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230207114456.2304801-1-usama.arif@bytedance.com> X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 5465C8000A X-Stat-Signature: 9jir5irnfwrardmr3wpg16zzgf7j9x5q X-HE-Tag: 1675849888-479765 X-HE-Meta: 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 t5GvBdwi jPEA7/AfukqEsGC92YiQdNnNy2a8mwPRTNzbSOrMnuvq4DUrLuoeC4i+KOImwiZxD1E3aZOBd9PP2LrpmEz8lI/lwHvIgLUrrtzL1Et0hWZnQkNNYUqjn7keF9NzAn9J6VphfKcizlcwV5OHN+6sSV5/Or+O+fbv4a2Ag8iKmARncKuVKnIfKxLOZFl5W5Y8SafTRtV4L3XUmylZlMP0MeMGbvkqRDQZZlZY119rS569FU7EvdmyR78Up+YqeF8sTNn9FJwN/YKskUgI4xrTHlkZODdWDWoOzsDXZNhB2JNceIjM3uDuJAS5NLcycj4CeOFXHUSI4Yv5FGulTAlpqyHD574JbL6SZ+HsxOOaHU+k/oBAHZASlepMQXQPHVxk6e8w8WfsSx3kIZJ37y+SQZ/DugumoCjr6Qa+lUyProT2lk10= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000006, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 Acked-by: Mike Rapoport (IBM) > --- > 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.