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 D8841C36010 for ; Fri, 4 Apr 2025 17:00:01 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 288A06B0023; Fri, 4 Apr 2025 12:59:59 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 239486B0025; Fri, 4 Apr 2025 12:59:59 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 03B2E6B0027; Fri, 4 Apr 2025 12:59:58 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id D22CA6B0025 for ; Fri, 4 Apr 2025 12:59:58 -0400 (EDT) Received: from smtpin08.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id E1013C0555 for ; Fri, 4 Apr 2025 16:59:59 +0000 (UTC) X-FDA: 83296973718.08.27B390B Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.16]) by imf17.hostedemail.com (Postfix) with ESMTP id 24C024000D for ; Fri, 4 Apr 2025 16:59:55 +0000 (UTC) Authentication-Results: imf17.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=cEHCzGjG; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf17.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.16 as permitted sender) smtp.mailfrom=dave.hansen@intel.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1743785998; a=rsa-sha256; cv=none; b=ibIanIOdaUXbPJcOFY5HEda0P30K7AblxzsvhqfnceFV/hNmo/mG1YIW4TsSSIWps1tXPN BjDAaBLvWtS75yHZtkwqDeh3QgkbBD1/VoLXZ+sU4hiI1ZPIqYikvz+gLkMSTIVuh2Zt8m YsSRYLzxR/36QC0w/qy6yP2YnyaEiGc= ARC-Authentication-Results: i=1; imf17.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=cEHCzGjG; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf17.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.16 as permitted sender) smtp.mailfrom=dave.hansen@intel.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1743785998; 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=16EO5gHAYM3HfAoKbUWH4VAGtB0baKyya/lFzoHjEKQ=; b=eLvzv2zCOXW7c7c4PhT0xkLTNb61Nn2KTWicLa5384s279sytRi0nKGo58Lp4imMSP7rEj G/VpexujQb0anlihFctbOJx0BuiFwGyR4UM0b9DnYc7N2APRt/UX5mo4EiklkfeF6y/Ali 8PkAXpnBDsrj0pDYfDi0aFITujjSjo8= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1743785997; x=1775321997; h=message-id:date:mime-version:subject:to:cc:references: from:in-reply-to:content-transfer-encoding; bh=16EO5gHAYM3HfAoKbUWH4VAGtB0baKyya/lFzoHjEKQ=; b=cEHCzGjG/fxkFxDR4gapV0VcEkUUZvaEk2sh9N2qCNOvZpUv/cq+rAOu A9w4fR1tKOgIneDqXv16CrY/4pihcI3otgdckYl4rGBYSMTyiOZfzMOri K1ivHZLSR5tU5enc+zVCJtxJGx79Dgcc02c3QDYsCOo9PSzwQ4kg6vx+V whGBvI63OgZYhzoXVRUpi2kvaUT21/Mhz7BJd3enugLlVD0bKGtSvWuRO qacMYPjEwaV3zbSaiANkxk/j36cyXvC+JUpttW4h8oF6VOj/B/f9NOWsm ntIhCEYBAqKJ3lWWCP4pkLcqMpqq5ThNBrxWMtHXQ4nycksczbd6XBMh4 w==; X-CSE-ConnectionGUID: 7jat6CT8Qj+embtXJgBi5w== X-CSE-MsgGUID: KdtBU3BTTSGqV1YqhE/BJA== X-IronPort-AV: E=McAfee;i="6700,10204,11394"; a="45323585" X-IronPort-AV: E=Sophos;i="6.15,188,1739865600"; d="scan'208";a="45323585" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa108.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Apr 2025 09:59:55 -0700 X-CSE-ConnectionGUID: nVEgby4lRBOEOo0i/NiK6Q== X-CSE-MsgGUID: CnVOypTjRUKrXxLXzYnmog== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,188,1739865600"; d="scan'208";a="127875646" Received: from daliomra-mobl3.amr.corp.intel.com (HELO [10.124.223.29]) ([10.124.223.29]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Apr 2025 09:59:51 -0700 Message-ID: Date: Fri, 4 Apr 2025 09:59:49 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 09/14] x86: Minimal SLAB alignment To: Maciej Wieczor-Retman , hpa@zytor.com, hch@infradead.org, nick.desaulniers+lkml@gmail.com, kuan-ying.lee@canonical.com, masahiroy@kernel.org, samuel.holland@sifive.com, mingo@redhat.com, corbet@lwn.net, ryabinin.a.a@gmail.com, guoweikang.kernel@gmail.com, jpoimboe@kernel.org, ardb@kernel.org, vincenzo.frascino@arm.com, glider@google.com, kirill.shutemov@linux.intel.com, apopple@nvidia.com, samitolvanen@google.com, kaleshsingh@google.com, jgross@suse.com, andreyknvl@gmail.com, scott@os.amperecomputing.com, tony.luck@intel.com, dvyukov@google.com, pasha.tatashin@soleen.com, ziy@nvidia.com, broonie@kernel.org, gatlin.newhouse@gmail.com, jackmanb@google.com, wangkefeng.wang@huawei.com, thiago.bauermann@linaro.org, tglx@linutronix.de, kees@kernel.org, akpm@linux-foundation.org, jason.andryuk@amd.com, snovitoll@gmail.com, xin@zytor.com, jan.kiszka@siemens.com, bp@alien8.de, rppt@kernel.org, peterz@infradead.org, pankaj.gupta@amd.com, thuth@redhat.com, andriy.shevchenko@linux.intel.com, joel.granados@kernel.org, kbingham@kernel.org, nicolas@fjasle.eu, mark.rutland@arm.com, surenb@google.com, catalin.marinas@arm.com, morbo@google.com, justinstitt@google.com, ubizjak@gmail.com, jhubbard@nvidia.com, urezki@gmail.com, dave.hansen@linux.intel.com, bhe@redhat.com, luto@kernel.org, baohua@kernel.org, nathan@kernel.org, will@kernel.org, brgerst@gmail.com Cc: llvm@lists.linux.dev, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com, x86@kernel.org References: <173d99afea37321e76e9380b49bd5966be8db849.1743772053.git.maciej.wieczor-retman@intel.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: <173d99afea37321e76e9380b49bd5966be8db849.1743772053.git.maciej.wieczor-retman@intel.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 24C024000D X-Stat-Signature: 7apjqyuo5kt3ndy6bgox3c9dttq3gj5j X-Rspam-User: X-Rspamd-Server: rspam06 X-HE-Tag: 1743785995-688093 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000480, 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 4/4/25 06:14, Maciej Wieczor-Retman wrote: > Adjust x86 minimal SLAB alignment to match KASAN granularity size. In > tag-based mode the size changes to 16 bytes so the value needs to be 16. I feel like we need a _bit_ of a discussion of the impact here. We are, after all, trying to get this feature into shape so that it can be used more widely outside of just debugging environments. What's the impact of this in a production environment?