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 7BF96CE7A9D for ; Thu, 5 Sep 2024 20:53:03 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id F30A06B0083; Thu, 5 Sep 2024 16:53:02 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id EE10D6B0085; Thu, 5 Sep 2024 16:53:02 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id D82296B0088; Thu, 5 Sep 2024 16:53:02 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id BAFF86B0083 for ; Thu, 5 Sep 2024 16:53:02 -0400 (EDT) Received: from smtpin25.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 452C7160B21 for ; Thu, 5 Sep 2024 20:53:02 +0000 (UTC) X-FDA: 82531884204.25.3C17384 Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by imf14.hostedemail.com (Postfix) with ESMTP id E132910000D for ; Thu, 5 Sep 2024 20:52:59 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Arg8zW9I; spf=pass (imf14.hostedemail.com: domain of dave.hansen@intel.com designates 192.198.163.7 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=1725569483; 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=lfzEU8VMATaR6h9aNYBHB1tKhmvQhcWJvYdi4fUNlI8=; b=8R0/QrX+Molv4R0ImnHdrIM8B7ly+pidhuwf9XPYJ65bIptkFQioclf9UyGQQf8mXVpzLK Rr/myVdo03UQag49CuNm9TDmowxGia4icrDpEO2SnZz6bIWAV04jJJ+15RwaRG6vE8LBrV CLk1iIiQNPVVYhNnLP2Lc4FJeP0hDvs= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1725569483; a=rsa-sha256; cv=none; b=YTpddUwI2/otnhGjWcDGSfhOQQ8P+6f+yHkm86woa7V2x7xlbIrK90y6TPrr6SK8OT3Il/ siUMQ4i9J1wPNZxgVyG14FKOQ0jBXewHDXmCqqJ5kYyiWihei8jZ5/Boghg2K4PtsZs6hJ Us66Z8xqxYNmpBCVHERxzVq36wlPdUI= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=intel.com header.s=Intel header.b=Arg8zW9I; spf=pass (imf14.hostedemail.com: domain of dave.hansen@intel.com designates 192.198.163.7 as permitted sender) smtp.mailfrom=dave.hansen@intel.com; dmarc=pass (policy=none) header.from=intel.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1725569580; x=1757105580; h=message-id:date:mime-version:subject:to:references:from: in-reply-to:content-transfer-encoding; bh=CVTdeNQIKUIF9JAYcbDK8tCXLGmTG1Vlm4IrR7UJ794=; b=Arg8zW9I63XZEHfSQzaIfnV4K947alxYK9TCa+CcBKUl2dQqtQKbjAGF 7POT9D6qhbXy/VCPFi0QC3AuwjHCnUZG5R6TvVIGmyw4G1H043q7KOKbH 2raNcZiMCfii23Fhk6KycyVYCbp98kD4EsiXL79CBAS2kpOTY3Vq9JGbQ yhS6P3cnDiqys4JYffoSZxwSGcPXab+puSKwese7LulPxeRPlZHWnbXpb tUHIgghdpD4/m4V6FXZGwJ1JrTU6pPFFqI9vF5+xLk9d9fQUYPzVAY39Q Hg0/TnztS7ydlpfFgwk3VmFlHoEb2lOeJooaHGqP0jzOOPlt5gfsimjZD w==; X-CSE-ConnectionGUID: WPFddQj3TKOQHqCnC+vwdA== X-CSE-MsgGUID: eT2A/SdiTsSszTEvYZEjfw== X-IronPort-AV: E=McAfee;i="6700,10204,11186"; a="49728626" X-IronPort-AV: E=Sophos;i="6.10,205,1719903600"; d="scan'208";a="49728626" Received: from fmviesa006.fm.intel.com ([10.60.135.146]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Sep 2024 13:52:59 -0700 X-CSE-ConnectionGUID: QYHW4ZFVSN+sMulGIhOMLg== X-CSE-MsgGUID: FV4rvcrcRpi/DkNjXDazcQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,205,1719903600"; d="scan'208";a="65391667" Received: from johncoop-mobl1.amr.corp.intel.com (HELO [10.124.222.49]) ([10.124.222.49]) by fmviesa006-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 05 Sep 2024 13:52:57 -0700 Message-ID: <5bcc86bd-d94d-4f4a-8f4e-81fad78c3e21@intel.com> Date: Thu, 5 Sep 2024 13:52:40 -0700 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] x86/mm/pat: Support splitting of virtual memory areas To: Nam Cao , "Liam R. Howlett" , 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> <20240905200802.2vY0SstV@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: <20240905200802.2vY0SstV@linutronix.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: E132910000D X-Stat-Signature: 1mj3fpctabwycsqns9u3awgr3sghjp86 X-Rspamd-Server: rspam09 X-Rspam-User: X-HE-Tag: 1725569579-417361 X-HE-Meta: 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 eiV6awcU jUqk2tzhYMWAknyg2g88zrxQnb0DjZpl/RgqVg/oYtroI5zu7+7ttUZ1nl0reyg/ixqiXuhodK1w8pPzD1koGLCICv09jwea8hOoPhj0+9mkDOIlZVIDtj0ge0tWvXCkCeLCp7frNBvKFeu44yv+YFL+kWFnWnOp7nyzIt/QTL9J+IMmeDUfDU4fLKumkZGJ+53DpLHzAYnmQBms= 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 9/5/24 13:08, Nam Cao wrote: > > If I pause this program right after the two mmap(), before any munmap(), > then: > $cat /sys/kernel/debug/x86/pat_memtype_list > PAT memtype list: > PAT: [mem 0x00000000bffe0000-0x00000000bffe2000] write-back > PAT: [mem 0x00000000bffe1000-0x00000000bffe2000] write-back > PAT: [mem 0x00000000fd000000-0x00000000fd002000] uncached-minus <-- what I described > PAT: [mem 0x00000000fd001000-0x00000000fd003000] uncached-minus <-- what I described > PAT: [mem 0x00000000febc0000-0x00000000febe0000] uncached-minus Well, that's not what I had in mind, so I'm obviously the confused one. Let me take a look through your example and see if I can offer any alternatives.