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(p200300d82f34a3001c2cf35ee8e5488e.dip0.t-ipconnect.de. [2003:d8:2f34:a300:1c2c:f35e:e8e5:488e]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a4efe73f83sm15508352f8f.49.2025.06.02.13.32.56 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 02 Jun 2025 13:32:57 -0700 (PDT) Message-ID: <842b8b5f-fe0b-436b-b8d7-64b215bdf9d9@redhat.com> Date: Mon, 2 Jun 2025 22:32:55 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 2/3] mm: add STATIC_PMD_ZERO_PAGE config option From: David Hildenbrand To: Pankaj Raghav , Christoph Hellwig , Pankaj Raghav Cc: Suren Baghdasaryan , Ryan Roberts , Vlastimil Babka , Baolin Wang , Borislav Petkov , Ingo Molnar , "H . Peter Anvin" , Zi Yan , Mike Rapoport , Dave Hansen , Michal Hocko , Lorenzo Stoakes , Andrew Morton , Thomas Gleixner , Nico Pache , Dev Jain , "Liam R . 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: fo5o5r977g173k5y7gtn9onzaeydjfsq X-Rspamd-Queue-Id: 90E6C1C0006 X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1748896381-533499 X-HE-Meta: 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 Pmx+l6+g ybOZ3MqLL8SqmFAfx2X+sQ+D46FViuBGwFCtM3i1FNzaZD6rKaO3dz1VHln/DC6759I1OUn9Y3xR3/+RjpnX5N6Rucf5YOpYiKCai+rIsSXmTX3UriZvqk3S9IuSMifQPP8+Oh5s/Cdy12UMxYUBHFVnZOc49RMwl3Y8DWv0TPdnvl3CYroHbT/twEDVK0J5OE+refl3VYsS4j440EaCcB6DM5Z+oJtEIjWMvetlopZtWQPZpeLcas/0kvcnbKSr7YZZNwNT+gP+y1YD3t1lcI3g6yk0w++ss2bDbDFkVSb7DckNLCpp4i51VarN3MDt6K6YNVlVduhvCGB5zwIF4CXPEy3wuodHMbyRLIYcpi6QaDcRnYGUrZqu9ikYQ/NTrZ5C/aT+pt2xvYjMn4sQfQ8PVX/ZSZohMkSfLJocdYQH8YxmGnI5QvEVJe3BS19aZxpSdJdog1SlDXOI= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 02.06.25 22:28, David Hildenbrand wrote: > On 02.06.25 16:49, Pankaj Raghav wrote: >> On 6/2/25 07:03, Christoph Hellwig wrote: >>> Should this say FOLIO instead of PAGE in the config option to match >>> the symbol protected by it? >>> >> I am still discussing how the final implementation should be with David. But I will >> change the _PAGE to _FOLIO as that is what we would like to expose at the end. > > It's a huge page, represented internally as a folio. No strong opinion, > as ... > > MMF_HUGE_ZERO_PAGE vs. mm_get_huge_zero_folio vs. get_huge_zero_page vs > ... :) Just to add, the existing one is exposed (configurable) to the user through /sys/kernel/mm/transparent_hugepage/use_zero_page combined with the implicit size through /sys/kernel/mm/transparent_hugepage/hpage_pmd_size -- Cheers, David / dhildenb