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[2003:d8:2f3f:f800:c101:5c9f:3bc9:3d08]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-40fc5602dc2sm2225863f8f.32.2025.09.25.02.38.39 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Sep 2025 02:38:41 -0700 (PDT) Message-ID: <54195a6a-7cc6-4df1-a787-45d8f564c0bd@redhat.com> Date: Thu, 25 Sep 2025 11:38:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 2/2] mm: add PMD-level huge page support for remap_pfn_range() To: Yin Tirui , akpm@linux-foundation.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, ziy@nvidia.com, baolin.wang@linux.alibaba.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, catalin.marinas@arm.com, will@kernel.org, paul.walmsley@sifive.com, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, anshuman.khandual@arm.com, yangyicong@hisilicon.com, ardb@kernel.org, willy@infradead.org, apopple@nvidia.com, samuel.holland@sifive.com, luxu.kernel@bytedance.com, abrestic@rivosinc.com, yongxuan.wang@sifive.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org Cc: wangkefeng.wang@huawei.com, chenjun102@huawei.com References: <20250923133104.926672-1-yintirui@huawei.com> <20250923133104.926672-3-yintirui@huawei.com> <8313b0c1-bf62-4257-951c-fd7e29193ae2@huawei.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: nqbcp4wfbmeiyeepnsyksr6djtxkod3j X-Rspam-User: X-Rspamd-Queue-Id: EE95CC0002 X-Rspamd-Server: rspam04 X-HE-Tag: 1758793125-511917 X-HE-Meta: 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 iWyYx3Er jjqu6G3EaNaApZjkZYesOqLW8VAQHyJ9yH5DMs62/eN3PC9WeIOa58wz0kPGm3UUrX7bvwgRp8XAKXElJrNDP9WGwnKwwDJVi2kMbQpWN6TN9dC+AbJZgO1QhbHJ3Pfu2xQQ+fYWPV918X3VrmR2Yd0o3kIbiy4fVbNQ9QzGzrrDAOj6iiaI53D83NJxsPOtgKILSAzlIFKlEgomLhQ4lICWFt6+TmdAJaekP0WK+NuKVOKKrDXdySiOIW4uo91VdCRwPUJH+bAVzAjBK0hn8SfTO5UCHV0N9bHoQXayK2GI7HkTZKdDsE8//GzgDAKgmzMMOIKDi0vvUReu8JGsVkM1bR1+HP8wfWfmmCLTz2J+y0/KBjuBgOf5NqYGzAXsoCy3Lj6vnepxDLFjCTUtKvkmxoyKKJ1YJW/qHN9IdvBq0ndqT5Qw20Zdp7nlqenB9VXo3CbBoNL8Y4Q/9JrDomo0RHYCvLgVUSCwy 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 25.09.25 03:43, Yin Tirui wrote: > > > On 9/24/2025 5:50 PM, David Hildenbrand wrote: >>> Introduce pfnmap_max_page_shift parameter to control maximum page >>> size and "nohugepfnmap" boot option to disable huge pfnmap entirely. >> >> Why? If an arch supports it we should just do it. Or what's the reason >> behind that? >> > There's no specific reason for this - it was just intended to provide an > additional option. I'll remove it in the next version. Good, then let's keep it simple :) -- Cheers David / dhildenb