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 DFFA1CA101F for ; Fri, 12 Sep 2025 12:25:41 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 49F688E0014; Fri, 12 Sep 2025 08:25:41 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 476BD8E0003; Fri, 12 Sep 2025 08:25:41 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 3656A8E0014; Fri, 12 Sep 2025 08:25:41 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 21CC48E0003 for ; Fri, 12 Sep 2025 08:25:41 -0400 (EDT) Received: from smtpin16.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id C220713B8DD for ; Fri, 12 Sep 2025 12:25:40 +0000 (UTC) X-FDA: 83880519240.16.2B7F376 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf30.hostedemail.com (Postfix) with ESMTP id 4F88180006 for ; Fri, 12 Sep 2025 12:25:38 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=COR5gYVO; spf=pass (imf30.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1757679938; 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=wTo+izX1w//0z26IKQTIbvBaXy5RN7cB2ha614yOXr0=; b=CjkWXT7CAAiGZ5ERW/VpWbFDtSFDLLZwCqyaIj6FlJ4C6hE3CR/Y60Ri4pmPObxuDGN732 cHRYVejCA+Mw1WOOSHgieedEJVExgRGRD+f6pT11+waFID6RNephKSC4zkn4wsMVNRle4Z R3l7IQ4VT8ssTccYTVtnbfnr8fqw0DQ= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=COR5gYVO; spf=pass (imf30.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757679938; a=rsa-sha256; cv=none; b=AlY1cwcY9XGCtad1Cd/TZiL9T7J6E/pH+opzfGmojbwHgcaUZzX/P/WH6Pa1QOcRdLuf2X 5don2W3jhl02cz7NVbkocHpJTIGuK6oCKXX4ZTtNnX52WKvuXQ+bjTuY1gN5Kgpg0XUBDv t6NU+SAW09MVyauO90Sc4Wnrks6Hn+A= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1757679937; h=from:from: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:autocrypt:autocrypt; bh=wTo+izX1w//0z26IKQTIbvBaXy5RN7cB2ha614yOXr0=; b=COR5gYVO8IQHtx64ybw10Nxjz5bcEZLpGRMaqt898a/5Iv5TA7DBlMjWPeFrXGaMjuQf0C /2mKOxeid6bFk9M+J+YXrjOOValz60Ok00D91kzTtWz+e/hQXE737L2JFGCJzMQ5Mm84Sa R7Rg+vzqwhgLD9kkKqk9JoTCZk3qrxU= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-298-JWh0LvsUOPG6xnmc94p7vQ-1; Fri, 12 Sep 2025 08:25:36 -0400 X-MC-Unique: JWh0LvsUOPG6xnmc94p7vQ-1 X-Mimecast-MFC-AGG-ID: JWh0LvsUOPG6xnmc94p7vQ_1757679935 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-3e424a186fcso995090f8f.0 for ; Fri, 12 Sep 2025 05:25:36 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757679935; x=1758284735; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=wTo+izX1w//0z26IKQTIbvBaXy5RN7cB2ha614yOXr0=; b=UVWP9fWESCReEvDFemcbeRXMJr4nYqEHh6FVXfJo5fTXCWLDPPBWFNPPZGXSFzTQx1 823C3y+qupT56YgC4onhjmeluL+QD25tC4/xdrXeV359pPgxOfn5pRDbNjb0q5KM5wLI xxSdeIzcT5TP5akg+tbDfaQnd1XUQbMSofu5NjKq4gZBqAv0xnuQxsL223WnQwi0lRSm mnnA2ZTEH/eSY2r2gYGJoVhCGf7W8MF4y29NnBamquR/goFL6Cmykx2I/+SL71DM0rmk 6V5lmenX3rbtscaKaBDqtd5Qfm7XT8TbrcQxDEk60m7sKoQ5s2wPXGALMpi8GnAhq3I5 gjZg== X-Gm-Message-State: AOJu0Yx/kXdJpWH8hW4Y5J3225vg/TOuz6oBxsHPrLPEAZBytwj3hHVQ f/y2lfgaByu36wpDpSq5zHLoUTj3VmHaG0rivbRmFKFwK0KR65yGNyrWeDbfyVADQret0e/Ik13 UxZB6ZAjCsbOTXJHHBs5xSS4n1KSsIbpagMwXGFHi/RpjFd2BPDYy X-Gm-Gg: ASbGncvaz6oLPc0LNOEVxNc00nhiuZQdvG7tUw6pljzIpXUY/3nBk80t+7rg45qV7sl uRQ7tSl71MkkyUUoUGZhdKG96lb4efks+Ih0lih9hJJMKMvh1Ga//DxgUKUdJXx9sjLlNF3L9ZF L/95JyWZ4Ujme3cdd+PSV6+kf+NPXAtZxtJIRuK1imqwhQBbGD7mzTWw8W/N6j6SGRDG0netAQJ UlChO8WpC5Le9NFEenYMWnLroC0/eWrBm0J8EQBqUzpYxr1w+hlvtjyD9qNvGqXhIuLYJot7c5j YVCixwQnJqWT6fWrvu7Ve+dsBvPy3i86XTsJVGXSnC7rpFUkA1Lf9JCVC2sFk1eWAr3nzKvIKcZ vl+exa6aAAlDv2k17uFnHbZRHDSZL484utKhexWCsek4p+Rf0g+lqr6454Nl5JveRAs4= X-Received: by 2002:a05:6000:178e:b0:3e4:957d:d00 with SMTP id ffacd0b85a97d-3e7659f5dd6mr2519969f8f.58.1757679935083; Fri, 12 Sep 2025 05:25:35 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH6PZSoaqYfs4WDxtD7xqA4jAMhuyLomw1mK3Dy9a1s3qWzRB2kaFiIuJKmlg+DYd89YE4p1Q== X-Received: by 2002:a05:6000:178e:b0:3e4:957d:d00 with SMTP id ffacd0b85a97d-3e7659f5dd6mr2519910f8f.58.1757679934531; Fri, 12 Sep 2025 05:25:34 -0700 (PDT) Received: from ?IPV6:2003:d8:2f20:da00:b70a:d502:3b51:1f2d? (p200300d82f20da00b70ad5023b511f2d.dip0.t-ipconnect.de. [2003:d8:2f20:da00:b70a:d502:3b51:1f2d]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3e7607d822fsm6485239f8f.53.2025.09.12.05.25.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 12 Sep 2025 05:25:34 -0700 (PDT) Message-ID: Date: Fri, 12 Sep 2025 14:25:31 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 00/15] khugepaged: mTHP support To: Kiryl Shutsemau , Nico Pache Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com, richard.weiyang@gmail.com, lance.yang@linux.dev, vbabka@suse.cz, rppt@kernel.org, jannh@google.com, pfalcato@suse.de References: <20250912032810.197475-1-npache@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: DV0sMx47eS2zWwCvsqXZ-RnHgArAEFz_rZypmKXQt2k_1757679935 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4F88180006 X-Rspam-User: X-Rspamd-Server: rspam07 X-Stat-Signature: 7h1s575dqqznx88wu6g8xis5kgf8ajq5 X-HE-Tag: 1757679938-450100 X-HE-Meta: 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 jDXIW5+x 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 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 12.09.25 14:19, Kiryl Shutsemau wrote: > On Thu, Sep 11, 2025 at 09:27:55PM -0600, Nico Pache wrote: >> The following series provides khugepaged with the capability to collapse >> anonymous memory regions to mTHPs. >> >> To achieve this we generalize the khugepaged functions to no longer depend >> on PMD_ORDER. Then during the PMD scan, we use a bitmap to track individual >> pages that are occupied (!none/zero). After the PMD scan is done, we do >> binary recursion on the bitmap to find the optimal mTHP sizes for the PMD >> range. The restriction on max_ptes_none is removed during the scan, to make >> sure we account for the whole PMD range. When no mTHP size is enabled, the >> legacy behavior of khugepaged is maintained. max_ptes_none will be scaled >> by the attempted collapse order to determine how full a mTHP must be to be >> eligible for the collapse to occur. If a mTHP collapse is attempted, but >> contains swapped out, or shared pages, we don't perform the collapse. It is >> now also possible to collapse to mTHPs without requiring the PMD THP size >> to be enabled. >> >> When enabling (m)THP sizes, if max_ptes_none >= HPAGE_PMD_NR/2 (255 on >> 4K page size), it will be automatically capped to HPAGE_PMD_NR/2 - 1 for >> mTHP collapses to prevent collapse "creep" behavior. This prevents >> constantly promoting mTHPs to the next available size, which would occur >> because a collapse introduces more non-zero pages that would satisfy the >> promotion condition on subsequent scans. > > Hm. Maybe instead of capping at HPAGE_PMD_NR/2 - 1 we can count > all-zeros 4k as none_or_zero? It mirrors the logic of shrinker. > I am all for not adding any more ugliness on top of all the ugliness we added in the past. I will soon propose deprecating that parameter in favor of something that makes a bit more sense. In essence, we'll likely have an "eagerness" parameter that ranges from 0 to 10. 10 is essentially "always collapse" and 0 "never collapse if not all is populated". In between we will have more flexibility on how to set these values. Likely 9 will be around 50% to not even motivate the user to set something that does not make sense (creep). Of course, the old parameter will have to stick around in compat mode. -- Cheers David / dhildenb