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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B46AC636F0 for ; Wed, 28 Aug 2024 18:30:22 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id C6E6A6B0082; Wed, 28 Aug 2024 14:30:21 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id C1E096B0083; Wed, 28 Aug 2024 14:30:21 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id ABF366B0085; Wed, 28 Aug 2024 14:30:21 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 8F2C56B0082 for ; Wed, 28 Aug 2024 14:30:21 -0400 (EDT) Received: from smtpin20.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 4AFBB1C486D for ; Wed, 28 Aug 2024 18:30:21 +0000 (UTC) X-FDA: 82502494242.20.ED3D5C3 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by imf28.hostedemail.com (Postfix) with ESMTP id 85D77C0032 for ; Wed, 28 Aug 2024 18:30:18 +0000 (UTC) Authentication-Results: imf28.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=IdH9rZi0; spf=pass (imf28.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.15 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1724869774; a=rsa-sha256; cv=none; b=JC/Y8ZVmuilplO4KRtcIJHm2BeiMJPhQgyPz2FyfQFZR+Tk6NENMvwG8PoreH5cQdtJLud hNXX7V4ITutaM++cvyCExk4/cP953wB1BWC0DEaF3AqDTfkWY83XZbZnaFDq0UBqD2aXYn rNbgK55dap5YHfc9TiIKO4b1IQIKLoM= ARC-Authentication-Results: i=1; imf28.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=IdH9rZi0; spf=pass (imf28.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.15 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1724869774; 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=5daKjp+Qx04Vf7reA7TlXz3W42SHadMeKVgX4B9Tp6I=; b=i/JAsPQVdm8O3GjU+SHK8//DxnK+7DYA1bThnAoFu3kruVmCSRIYRyZJ56ZRBYWA/khYyv H848cWZjDaUrivZno/m8lyKtMMG+efeUDP/rGzqboz1+O3ovbcWs5pOoPj0S8nOIvPPl0R 3LftYR+0IE411gulKVh+kxIJlVLNKUk= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1724869819; x=1756405819; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=dQea9Qg67PNDnhCueW2H/8mfLiFuzo4DZ42TUgKOsS0=; b=IdH9rZi05gUZatUR0A96e1HtT3dBlW8tjOiz1WfpAKavCr+jdgPzYKR7 kkyVvfEclALCXfRsnaxaOrq6rlJ9SUDLuc+s3Cmn9swhup0Z3mTgT/Hq4 KZJT6xalPlhJvD0+TuFv7f/tGcqu1HZZ5J27/28LuzSCPAI8pmf3GLIR4 OX0vZkzaDFzNqtOA5N7jNGZ774bK1xZkwwL+hy0yBOyvuAOZn0zt2W1O5 uJY1ZgOj8m/5jOA5I1R4cpiippI/ol8ByttMNH3qutcGW0U/oR/OwR9RI H2We+w4rigKhH/sdpKzSZbAPfmmpM69jwBXmB57ux+NzrJC6lUocr/9k6 A==; X-CSE-ConnectionGUID: XcGIQctJStm+UNEJ9HDtIw== X-CSE-MsgGUID: 2OML+naCQxSeiCGkV4GlSg== X-IronPort-AV: E=McAfee;i="6700,10204,11178"; a="27190770" X-IronPort-AV: E=Sophos;i="6.10,183,1719903600"; d="scan'208";a="27190770" Received: from orviesa005.jf.intel.com ([10.64.159.145]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2024 11:30:16 -0700 X-CSE-ConnectionGUID: cW31v/9QTRCkZrSZJOA/8w== X-CSE-MsgGUID: Hl5mMik3R8aDwCjQ+6JOBg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,183,1719903600"; d="scan'208";a="68152618" Received: from sramkris-mobl1.amr.corp.intel.com (HELO [10.124.223.210]) ([10.124.223.210]) by orviesa005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 28 Aug 2024 11:30:13 -0700 Message-ID: Date: Wed, 28 Aug 2024 11:29:56 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 00/16] mm: Introduce MAP_BELOW_HINT To: Charlie Jenkins , Arnd Bergmann , Paul Walmsley , Palmer Dabbelt , Albert Ou , Catalin Marinas , Will Deacon , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Huacai Chen , WANG Xuerui , Russell King , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Shuah Khan , Alexandre Ghiti Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, Palmer Dabbelt , linux-riscv@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@rivosinc.com> From: Dave Hansen Content-Language: en-US Autocrypt: addr=dave.hansen@intel.com; keydata= xsFNBE6HMP0BEADIMA3XYkQfF3dwHlj58Yjsc4E5y5G67cfbt8dvaUq2fx1lR0K9h1bOI6fC oAiUXvGAOxPDsB/P6UEOISPpLl5IuYsSwAeZGkdQ5g6m1xq7AlDJQZddhr/1DC/nMVa/2BoY 2UnKuZuSBu7lgOE193+7Uks3416N2hTkyKUSNkduyoZ9F5twiBhxPJwPtn/wnch6n5RsoXsb ygOEDxLEsSk/7eyFycjE+btUtAWZtx+HseyaGfqkZK0Z9bT1lsaHecmB203xShwCPT49Blxz VOab8668QpaEOdLGhtvrVYVK7x4skyT3nGWcgDCl5/Vp3TWA4K+IofwvXzX2ON/Mj7aQwf5W iC+3nWC7q0uxKwwsddJ0Nu+dpA/UORQWa1NiAftEoSpk5+nUUi0WE+5DRm0H+TXKBWMGNCFn c6+EKg5zQaa8KqymHcOrSXNPmzJuXvDQ8uj2J8XuzCZfK4uy1+YdIr0yyEMI7mdh4KX50LO1 pmowEqDh7dLShTOif/7UtQYrzYq9cPnjU2ZW4qd5Qz2joSGTG9eCXLz5PRe5SqHxv6ljk8mb ApNuY7bOXO/A7T2j5RwXIlcmssqIjBcxsRRoIbpCwWWGjkYjzYCjgsNFL6rt4OL11OUF37wL QcTl7fbCGv53KfKPdYD5hcbguLKi/aCccJK18ZwNjFhqr4MliQARAQABzUVEYXZpZCBDaHJp c3RvcGhlciBIYW5zZW4gKEludGVsIFdvcmsgQWRkcmVzcykgPGRhdmUuaGFuc2VuQGludGVs LmNvbT7CwXgEEwECACIFAlQ+9J0CGwMGCwkIBwMCBhUIAgkKCwQWAgMBAh4BAheAAAoJEGg1 lTBwyZKwLZUP/0dnbhDc229u2u6WtK1s1cSd9WsflGXGagkR6liJ4um3XCfYWDHvIdkHYC1t MNcVHFBwmQkawxsYvgO8kXT3SaFZe4ISfB4K4CL2qp4JO+nJdlFUbZI7cz/Td9z8nHjMcWYF IQuTsWOLs/LBMTs+ANumibtw6UkiGVD3dfHJAOPNApjVr+M0P/lVmTeP8w0uVcd2syiaU5jB aht9CYATn+ytFGWZnBEEQFnqcibIaOrmoBLu2b3fKJEd8Jp7NHDSIdrvrMjYynmc6sZKUqH2 I1qOevaa8jUg7wlLJAWGfIqnu85kkqrVOkbNbk4TPub7VOqA6qG5GCNEIv6ZY7HLYd/vAkVY E8Plzq/NwLAuOWxvGrOl7OPuwVeR4hBDfcrNb990MFPpjGgACzAZyjdmYoMu8j3/MAEW4P0z F5+EYJAOZ+z212y1pchNNauehORXgjrNKsZwxwKpPY9qb84E3O9KYpwfATsqOoQ6tTgr+1BR CCwP712H+E9U5HJ0iibN/CDZFVPL1bRerHziuwuQuvE0qWg0+0SChFe9oq0KAwEkVs6ZDMB2 P16MieEEQ6StQRlvy2YBv80L1TMl3T90Bo1UUn6ARXEpcbFE0/aORH/jEXcRteb+vuik5UGY 5TsyLYdPur3TXm7XDBdmmyQVJjnJKYK9AQxj95KlXLVO38lczsFNBFRjzmoBEACyAxbvUEhd GDGNg0JhDdezyTdN8C9BFsdxyTLnSH31NRiyp1QtuxvcqGZjb2trDVuCbIzRrgMZLVgo3upr MIOx1CXEgmn23Zhh0EpdVHM8IKx9Z7V0r+rrpRWFE8/wQZngKYVi49PGoZj50ZEifEJ5qn/H Nsp2+Y+bTUjDdgWMATg9DiFMyv8fvoqgNsNyrrZTnSgoLzdxr89FGHZCoSoAK8gfgFHuO54B lI8QOfPDG9WDPJ66HCodjTlBEr/Cwq6GruxS5i2Y33YVqxvFvDa1tUtl+iJ2SWKS9kCai2DR 3BwVONJEYSDQaven/EHMlY1q8Vln3lGPsS11vSUK3QcNJjmrgYxH5KsVsf6PNRj9mp8Z1kIG qjRx08+nnyStWC0gZH6NrYyS9rpqH3j+hA2WcI7De51L4Rv9pFwzp161mvtc6eC/GxaiUGuH BNAVP0PY0fqvIC68p3rLIAW3f97uv4ce2RSQ7LbsPsimOeCo/5vgS6YQsj83E+AipPr09Caj 0hloj+hFoqiticNpmsxdWKoOsV0PftcQvBCCYuhKbZV9s5hjt9qn8CE86A5g5KqDf83Fxqm/ vXKgHNFHE5zgXGZnrmaf6resQzbvJHO0Fb0CcIohzrpPaL3YepcLDoCCgElGMGQjdCcSQ+Ci FCRl0Bvyj1YZUql+ZkptgGjikQARAQABwsFfBBgBAgAJBQJUY85qAhsMAAoJEGg1lTBwyZKw l4IQAIKHs/9po4spZDFyfDjunimEhVHqlUt7ggR1Hsl/tkvTSze8pI1P6dGp2XW6AnH1iayn yRcoyT0ZJ+Zmm4xAH1zqKjWplzqdb/dO28qk0bPso8+1oPO8oDhLm1+tY+cOvufXkBTm+whm +AyNTjaCRt6aSMnA/QHVGSJ8grrTJCoACVNhnXg/R0g90g8iV8Q+IBZyDkG0tBThaDdw1B2l asInUTeb9EiVfL/Zjdg5VWiF9LL7iS+9hTeVdR09vThQ/DhVbCNxVk+DtyBHsjOKifrVsYep WpRGBIAu3bK8eXtyvrw1igWTNs2wazJ71+0z2jMzbclKAyRHKU9JdN6Hkkgr2nPb561yjcB8 sIq1pFXKyO+nKy6SZYxOvHxCcjk2fkw6UmPU6/j/nQlj2lfOAgNVKuDLothIxzi8pndB8Jju KktE5HJqUUMXePkAYIxEQ0mMc8Po7tuXdejgPMwgP7x65xtfEqI0RuzbUioFltsp1jUaRwQZ MTsCeQDdjpgHsj+P2ZDeEKCbma4m6Ez/YWs4+zDm1X8uZDkZcfQlD9NldbKDJEXLIjYWo1PH hYepSffIWPyvBMBTW2W5FRjJ4vLRrJSUoEfJuPQ3vW9Y73foyo/qFoURHO48AinGPZ7PC7TF vUaNOTjKedrqHkaOcqB185ahG2had0xnFsDPlx5y In-Reply-To: <20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@rivosinc.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: bm8tus9nqyeugjmasiop8wkh735ockac X-Rspamd-Queue-Id: 85D77C0032 X-Rspam-User: X-Rspamd-Server: rspam10 X-HE-Tag: 1724869818-848118 X-HE-Meta: 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 Z7g7Rouh l7zJeYhVfrB5Yk6Dc9Sye6u2X7XpBxfoTo3mRd1I1OjdeJj3UH7yOdgSvG3YEgaeL6qzuaFF7gWuR8PeksDNcV86J326CldFyDcg6Ry37R2czq3aFrj9SQkm1nsYpHQIQQXt7cobjs/iWlRPt6XB/M0US/YQUX9QQqJY/zVYeS3ULiH2XOby//zsiIEI0G1hjrhlp+2+6ro/Q1Wubcx95HxHO/565IiZUnwP8 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 8/27/24 22:49, Charlie Jenkins wrote: > Some applications rely on placing data in free bits addresses allocated > by mmap. Various architectures (eg. x86, arm64, powerpc) restrict the > address returned by mmap to be less than the maximum address space, > unless the hint address is greater than this value. Which applications are these, btw? Is this the same crowd as the folks who are using the address tagging features like X86_FEATURE_LAM? Even if they are different, I also wonder if a per-mmap() thing MAP_BELOW_HINT is really what we want. Or should the applications you're trying to service here use a similar mechanism to how LAM affects the *whole* address space as opposed to an individual mmap().