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(p200300d82f06a600a397de1d2f8bb66f.dip0.t-ipconnect.de. [2003:d8:2f06:a600:a397:de1d:2f8b:b66f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-459c58ed07fsm345483105e9.22.2025.08.11.03.21.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 11 Aug 2025 03:21:26 -0700 (PDT) Message-ID: <57bec266-97c4-4292-bd81-93baca737a3c@redhat.com> Date: Mon, 11 Aug 2025 12:21:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/5] add persistent huge zero folio support To: Kiryl Shutsemau , Lorenzo Stoakes Cc: "Pankaj Raghav (Samsung)" , Suren Baghdasaryan , Ryan Roberts , Baolin Wang , Vlastimil Babka , Zi Yan , Mike Rapoport , Dave Hansen , Michal Hocko , Andrew Morton , Thomas Gleixner , Nico Pache , Dev Jain , "Liam R . Howlett" , Jens Axboe , linux-kernel@vger.kernel.org, linux-mm@kvack.org, willy@infradead.org, Ritesh Harjani , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, "Darrick J . Wong" , mcgrof@kernel.org, gost.dev@samsung.com, hch@lst.de, Pankaj Raghav References: <20250811084113.647267-1-kernel@pankajraghav.com> <112b4bcd-230a-4482-ae2e-67fa22b3596f@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: l-5IypARMdxFBY5yqc1Yexj1QS7v6bugfgjLGxsq8Pk_1754907690 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: rspam03 X-Rspamd-Queue-Id: D67098000D X-Stat-Signature: 1eq3m3zqs8p497eqwobcmzt65eqbkij5 X-Rspam-User: X-HE-Tag: 1754907692-856197 X-HE-Meta: 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 ob5kW6WM 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 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 11.08.25 12:17, Kiryl Shutsemau wrote: > On Mon, Aug 11, 2025 at 11:09:24AM +0100, Lorenzo Stoakes wrote: >> On Mon, Aug 11, 2025 at 11:07:48AM +0100, Kiryl Shutsemau wrote: >>> >>> Well, my worry is that 2M can be a high tax for smaller machines. >>> Compile-time might be cleaner, but it has downsides. >>> >>> It is also not clear if these users actually need physical HZP or virtual >>> is enough. Virtual is cheap. >> >> The kernel config flag (default =N) literally says don't use unless you >> have plenty of memory :) >> >> So this isn't an issue. > > Distros use one-config-fits-all approach. Default N doesn't help > anything. You'd probably want a way to say "use the persistent huge zero folio if you machine has more than X Gigs". That's all reasonable stuff that can be had on top of this series. -- Cheers, David / dhildenb