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 273DACD4F30 for ; Wed, 4 Sep 2024 21:30:11 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 98D3A6B02C4; Wed, 4 Sep 2024 17:30:10 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 93D496B02C6; Wed, 4 Sep 2024 17:30:10 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7B66B6B02C8; Wed, 4 Sep 2024 17:30:10 -0400 (EDT) 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 57CB26B02C4 for ; Wed, 4 Sep 2024 17:30:10 -0400 (EDT) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id C8018A0572 for ; Wed, 4 Sep 2024 21:30:09 +0000 (UTC) X-FDA: 82528348938.07.A3D91F8 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.21]) by imf05.hostedemail.com (Postfix) with ESMTP id 92E0D100008 for ; Wed, 4 Sep 2024 21:30:06 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Hn+3IVjI; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf05.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.21 as permitted sender) smtp.mailfrom=dave.hansen@intel.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1725485336; a=rsa-sha256; cv=none; b=s6LfxfCLAFH5Q4t+vWixaqqnXQSWYxvSFUwLK3JEcHHr7PuXmjuIqJwvGaSsanOg63/w7X 5Ah0canp0DM0AemK+PMsH1luklhGP9cmVwBw766HPcMWAaUJw/lmE4f/mU1vfbXWJ6Uhov EHudUlDHYUu+8wd5Lr1Abb+71WNoNvI= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Hn+3IVjI; dmarc=pass (policy=none) header.from=intel.com; spf=pass (imf05.hostedemail.com: domain of dave.hansen@intel.com designates 198.175.65.21 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=1725485336; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to: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=mJquvqnGQuA6eTa1Dsz5yoTLsgS/Ea9+G/wyqgztmto=; b=OUf+cK368tlU7Q9yQbV4PjV0CPU4AYKQfQOrWMMAz9LpS+jHeOqb5P0FfBXSIt7iWnMnfj JDxdbG+UKjtaqyebrmZ1GDKtn0MpJmUdc5xAe6RBpcs8btr/4ypZbEUyD0KqsNFnPLTWQX Qi7OE355unxPXEK6ZcpPmMtVfcun3DI= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1725485406; x=1757021406; h=message-id:date:mime-version:subject:to:references:from: in-reply-to:content-transfer-encoding; bh=nHVdGMmtGqdm8ynbTTEm4YKtR+IW9W5GbHZoGyj4q0U=; b=Hn+3IVjIqPEpoqygPJR5Cb+99vISpCmCfZ7XWYhotMIPlIeOdccN10gV AZktdmtgfeKN3GDWa+XSqQ4KxLNuX9MDURguquVYtyvDsTdkpiN/ABs1J N5kfg/Rg+KLBvLU/HsKSK4qp0dccj4jtjrNOsYrOoKv9uRcyKKE+U+8Ms ZS170UE94ZYQEDD27LRvkkvEikQxZYcZtBayW7B0k23oHizFZACJ9o+tZ L/aYIZDG9TOTSfOnO/7Qg5r3EqKzVjvsk3QYyPlNk9XdpG27phOo8LrPv zJ86aQ/Eio0L4od3kveZAoA/o66cQBhgpGmlb6U0VDxXGHuSk+FBGRqXO g==; X-CSE-ConnectionGUID: xHPaE3uJSiGFgS4+oA95qA== X-CSE-MsgGUID: iil2lFuNRfiKjQS43OOILw== X-IronPort-AV: E=McAfee;i="6700,10204,11185"; a="24126590" X-IronPort-AV: E=Sophos;i="6.10,203,1719903600"; d="scan'208";a="24126590" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by orvoesa113.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Sep 2024 14:30:05 -0700 X-CSE-ConnectionGUID: rmmsupynRlKTcobyWWuxqw== X-CSE-MsgGUID: Det/crlQTK6NQZtr9qjDUQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,203,1719903600"; d="scan'208";a="96143408" Received: from nnlnb-hw-22.ccr.corp.intel.com (HELO [10.125.109.212]) ([10.125.109.212]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 04 Sep 2024 14:30:05 -0700 Message-ID: <111407dd-3628-4cbc-91ea-a1c31e27ed2b@intel.com> Date: Wed, 4 Sep 2024 14:29:47 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86/mm/pat: Support splitting of virtual memory areas To: "Liam R. Howlett" , Nam Cao , Dave Hansen , Andy Lutomirski , Peter Zijlstra , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Andrew Morton , Vlastimil Babka , Lorenzo Stoakes , linux-kernel@vger.kernel.org, linux-mm@kvack.org, bigeasy@linutronix.de References: <20240825152403.3171682-1-namcao@linutronix.de> <5jrd43vusvcchpk2x6mouighkfhamjpaya5fu2cvikzaieg5pq@wqccwmjs4ian> <20240827075841.BO2qAOzq@linutronix.de> <20240903103616.i0GrRAfD@linutronix.de> <20240904075937.xh2rLk3q@linutronix.de> 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 92E0D100008 X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: 136etc6n6md9kcac1saun8wzqeappytp X-HE-Tag: 1725485406-650078 X-HE-Meta: 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 efz4ZX2e ODfbwxsqK+ISN1ata6NyzEIirUs1TbAX899wYS/VR50WOt1UjHQazNkC/eIUoZEQceaqLk+QFRxsv3+13MElKiSv6AzG755dVRFyINJUNV2UaNWl961oWFMgOysOwkHx8X+Hal5ZymVkTiapMoAhzH4RawGm8enBojf/3C/oKTgH1aJ7z3RqBa4doohxzoyv083hTI9uenQzMXf4= 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 9/4/24 11:40, Liam R. Howlett wrote: > But those ranges won't exist. What appears to be happening in this code > is that there are higher levels of non-overlapping ranges with > memory (cache) types (or none are defined) , which are tracked on page > granularity. So we can't have a page that has two memory type. Yeah, that's the key. Each page should be uniquely covered by one and only one tree leaf. Nam, I didn't see your original patch in my inbox and I don't see it on lore either. Is there something funky going on there?