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Wed, 8 Apr 2026 14:14:43 +0000 (UTC) X-FDA: 84635584446.01.3B577C1 Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf05.hostedemail.com (Postfix) with ESMTP id 5C9CE10000B for ; Wed, 8 Apr 2026 14:14:41 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=cmplxyhy; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf05.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1775657681; 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=CdhiEWiYLLXsfzins6vHj9/8/3eZhtuqd6zJJxWmlOU=; b=jhMfr/hn696ISPxmCSe0B7M4iYk7aI0/K7ejjwW+LzwWq2mThP0W/1NXPx224RT4RUaz/J DIoS5jXEqErS2VSWe6O+x2bYQuT6KJ7FcyX83tSxNvZsfw0hmWZSrW1CbBqnnNfy6EU3/S YxNJIp5LV82wFYJEdnzh+qF21VeEVlU= ARC-Seal: i=1; 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b=cmplxyhycPBF8vYPibwQTrtzSgECpnUii+twBF29DlInFp4TWJ+W+NOsiWVeS/eTc +UhbqSn8Ufvx6rNHfDIhUxHM0z9WhVaxfSiWV21Oy6cO5hkqVANXuFPAPoimjKimVb Ec7aTg2V3/ALm/7G/7McUe8FQ2vVb2gKOwEVR3l2JAKknHVty/UOSB3I7m3pVGo/1i /N4o/TrFBvkFUY96Vl1v4QW833tqNFHbP3pplkwDt8JeBZaGUw+tAT3cFvCKUmAcew YEpTrztVTpXHNDMm0OCmGYYqT2HH1JdwznuwtE1h/6r7g8CAC5bEp7DXW1GYsPbzm/ 3TxrQLHQ4CNFA== Message-ID: <3b7d20c2-a0c7-42c9-b303-1dfd6503cae1@kernel.org> Date: Wed, 8 Apr 2026 16:14:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/11] mm: thp: always enable mTHP support To: Luiz Capitulino , linux-kernel@vger.kernel.org, linux-mm@kvack.org, baolin.wang@linux.alibaba.com Cc: ryan.roberts@arm.com, akpm@linux-foundation.org, lorenzo.stoakes@oracle.com References: <835725cc-1670-45ae-bf58-593aadec6b88@kernel.org> <8d03a508-5836-4001-8eb8-b216251dc29d@redhat.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <8d03a508-5836-4001-8eb8-b216251dc29d@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 5C9CE10000B X-Stat-Signature: 7953jefwyib15poe7jaxfdw8mhi468rq X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1775657681-706162 X-HE-Meta: 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 wTYsda2s FWEh/eHMTg1QyuhGv+B+eOIUvhG4ehDspEEsunZgBQBARd8OonVLfBV5BsjfrT0A4gZ164ZqwiJb9Ukgo1Hjpo/Rcm5jfoK3kw1t7DOYww14WQDGz8utk8Y9GzofGB4O4nVrOze9ip9ij2pEwIKP4nzJ+MqIfn3hXnT8pj2pIvmAr8aq/6t5ico0eghw6f5zgl7uxmK/qmReuhbpQdGxcLPZPulf8D+LdsWW52ENQWJAFFclYgrCyDvtA4k3to9hTZc2T Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/2/26 13:56, Luiz Capitulino wrote: > On 2026-04-02 04:25, David Hildenbrand (Arm) wrote: >> On 2/9/26 23:14, Luiz Capitulino wrote: >>> Today, if an architecture implements has_transparent_hugepage() and >>> the CPU >>> lacks support for PMD-sized pages, the THP code disables all THP, >>> including >>> mTHP. In addition, the kernel lacks a well defined API to check for >>> PMD-sized page support. It currently relies on >>> has_transparent_hugepage() >>> and thp_disabled_by_hw(), but they are not well defined and are tied to >>> THP support. >>> >>> This series addresses both issues by introducing a new well defined API >>> to query PMD-sized page support: pgtable_has_pmd_leaves(). Using this >>> new helper, we ensure that mTHP remains enabled even when the >>> architecture or CPU doesn't support PMD-sized pages. >>> >>> Thanks to David Hildenbrand for suggesting this improvement and for >>> providing guidance (all bugs and misconceptions are mine). >>> >>> This applies to v6.19, but I tested it on v6.19-rc8+. >> >> Apologies for the delay Luiz (as told you off-list :) ), I'll try going >> through this soon so we can start queuing this after -rc1. > > Oh, wow, thanks for the support! > > I intended to get back to this series this week to address Baolin's > comments, but I got busy with other things (which is something I may > bring up on upstream but it's not related to this series at all). > Okay, I'll wait for your next posting and prioritize that :) -- Cheers, David