From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 515C4E98DE6 for ; Mon, 23 Feb 2026 15:49:29 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 842D26B0089; Mon, 23 Feb 2026 10:49:28 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 824116B008A; Mon, 23 Feb 2026 10:49:28 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 730336B008C; Mon, 23 Feb 2026 10:49:28 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 615DB6B0089 for ; Mon, 23 Feb 2026 10:49:28 -0500 (EST) Received: from smtpin05.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id BA1681601CE for ; Mon, 23 Feb 2026 15:49:27 +0000 (UTC) X-FDA: 84476155974.05.28E05E5 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf04.hostedemail.com (Postfix) with ESMTP id E36CB4000C for ; Mon, 23 Feb 2026 15:49:25 +0000 (UTC) Authentication-Results: imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ncL+uf1q; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1771861766; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=A7fYQTc84r1/zu9zpGzDG2R1XrF3H1WnRAanBj1ceeM=; b=SCPERYygK2rqdzuZEMm8y/o0IRW9MKdk/T3K3AQPx1f3zqf6xj13IFU/e+2nMXaC7nR0aK jyoQN+4wIxGD1mwAWHkAwodq7Om7sWnupyHTvUdQyuGX7MqHVrn3UCELoJYUWOx4lhu2jJ ZRxZH212BI8UvhZwZz3zp95d1UHB1e4= ARC-Authentication-Results: i=1; imf04.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=ncL+uf1q; spf=pass (imf04.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1771861766; a=rsa-sha256; cv=none; b=Wwo+hjsnAD3liCtfdEgJ6HBtEiJ0oi+7Y9pH3XyZUL2Gufp+9iaoiZcinFQ4qlYN5PPAlg 4ZymzWTZI0J8m6b7U/U1G05/X6RkXFY6rR+yk6uPa2eBYZQZ729XypJvgSmRJj1ebz5KaF nw0mMKDE6qnuekLG1PwILYdeaUOfQTM= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id E8F4341A1E; Mon, 23 Feb 2026 15:49:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5E514C116C6; Mon, 23 Feb 2026 15:49:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771861764; bh=/rX5cxW6YqpqKuij6MEUu5GKJrUsD5jfRzpeftOIJZw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ncL+uf1q/xikEc43CSU/ATVyOTsfZwmIpxPnpD0dPhjQ0fmzgG0lfLRkT4POPAq4G xiGlomhIXQJTz5LpIyGkdg+9cIC3K/j6tccF58PzUeID4aUfC6npVuNwbn6uvv214Q 8WHqnEZayBjpl9XjAtEg1FUrTTf3v0OFyw2n9zlqioQAlGMgTO90zsa/0DDRS7I4gd YFmYE+5QGr9ZTiv0+ZV8bKXAMEulQZGiWl9z8JC4bGbGQBCTMSEgQW5L7onFm1rvly wUAnw8JNCbwBBsYq2TY/JvhKWevq7nluSZrpykS2X3BNGHbfcczPAvNidyexOAaHxE JTxGDneQ98mjw== Message-ID: <91fdfa21-9efa-4354-b349-921ce990bb4c@kernel.org> Date: Mon, 23 Feb 2026 16:49:18 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [LSF/MM/BPF TOPIC] 64k (or 16k) base page size on x86 To: Kiryl Shutsemau Cc: Dave Hansen , Kalesh Singh , lsf-pc@lists.linux-foundation.org, linux-mm@kvack.org, x86@kernel.org, linux-kernel@vger.kernel.org, Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , Lorenzo Stoakes , "Liam R. Howlett" , Mike Rapoport , Matthew Wilcox , Johannes Weiner , Usama Arif References: <17c5708d-3859-49a5-814e-bc3564bc3ac6@kernel.org> <32ed82dd-62c3-4a5c-8bae-9465afd7e75f@kernel.org> <06684dc4-3902-4452-824a-ee2064314d24@kernel.org> <7b414e68-4d0b-4d2b-a664-bbbdf314c0d3@intel.com> <89cc554e-9c6a-4c8d-8c30-573b2eabccac@kernel.org> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam05 X-Rspam-User: X-Rspamd-Queue-Id: E36CB4000C X-Stat-Signature: ox3hsiqbojp166a3zjimci88w36xhro8 X-HE-Tag: 1771861765-44970 X-HE-Meta: U2FsdGVkX1+kM0kXiT1n3+P03UCirbAJXq3yWdWBF7tZb/wj/4vf9paE/voPEkwYdXWZbox31koLcPLs/4QL4/aerpTNghEe+8MTlhjoTnKn8Whtpr5J3uxEBr9ibBJUrDhaML+5DFTHUvc6COuxbzddq7ngZkZVkfIGYvXcvvWViq53gyz6LMygdTUXYYhZdlz7/MgpqudVsRjPh8HSlnCqcUz2NWsZu4NC3CE5s7dPnWVZW8n3ucU8uTOJ+PJVC0M9JsAHcxatQj4IShlfY/D7a8tXM7m0qxRTBDDgJ4R9FAXQDZL8fFJ6vkytdPohlqQZg5Md089v+PunQZdlztlP8BdtoWOrstt0C3YitQa6LuAbiKQnNnMi5KtSjM6eBlrJm+nPpGNICMm35rigiNOB93FCdGCpbqenSBSgz0cFgChBM3gawsgGUKlqY+q2FxGqM9pp0y/HYlDX08ETaDQqlBBD1V31A13f9oUxyvxKhHOad1EOAATy8p0fLPHuLeBR1QkwM8+BZVwyo81joMgJtyExsYThCzG8K2vc1bBHCipGzLusUeZHhiqUniT8ti2MkgaRfbrWClyYdCVAZrLFj5Z38nq28OSBCcGLUQSGUrY8jjX+t8cifs72sr6F9qml/6YDfYl5sylUt/bl1buZJ9Rf7Cs656r2aJ+JAXXlFOnj4RWK6O3mw8ojC+1dgtX7ozioylRCQZ1TvuTCdFCGu466Pb2IVL9YUExGDNWTioWJE8lGIFLf9AgcqUgRp/LEDTyAMhhr3uF30cv14N8SrwuNIxQPK18SShc74d7PVo9uCoGAWsmwxAIP9O9JPzrF2TFmBPiW2w38F9XeGkazwXw8hIasMj2vluLdYje0DGzcZguBB7Wt/z94rtg+scEVSqIcR38uaiTPSj/MPrJOdZhW5SNahKkTUVKYfazRVpuUkHR5XFbr5s18JKsAT3i0e+MzG777NR4cq5E xRR2HK+c 6DhFQXMJgu6AKx1Wilv32MyG0UZZwJOykRTjH8ZAmRKVq8SexhscPbSpK8ge5UrLpZ7vDvorb6eTX/LB0tPF68r4YM0i+Hvo8ygqGXnEg0xrzkYeK2vqr/5BSGUyRclsh2BH+r5eH59grylrDdHdca76UYJ5UO8sKoFo2JVF1SdebK16/XqYblSAd3Neilg2gnyPjXaS8tYIHR07g3uDbScDUbBGeurOAUTGlGAHd/c7jTTfnUMXpPytxW1uTeg7Ih0g8 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: >> >> Just thinking about VMAs spanning partial pages makes me shiver. Or A >> single page spanning multiple VMAs. > > Hate to break it to you, but we have it now upstream :P > > THP can span multiple VMAs. And can be partially mapped. Single mapcount, single anon-exclusive flag. Completely different story :P -- Cheers, David