From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793360139; b=ajf4yrSLEb3j84t5ro+HHYTJXJvAZmwhWomYmbhzMYe0wx0epSONGAVreuZOSQDK1Q1E 7K5ApNXk2PNQSVazihYwBn3Ao2oxLjz/W1UKmYgTYc1GXYluzfUMoBQM67viBiadLVaQ5 qRJ1l3ltFqb+qtOtR23Y8mYFzzAY/vbfDYzJv6+8JU9UL4OJNVa6/v5DOAsnHfQ3KR/tW nGXkbLnOZdDlh1iBVEw9NJFXKRc9qE1JmM9Wze1wAhgfMndBNTXpVzrKmBaXOIg3vDXJA Ur/B/DPYF1IuhLX8DwbuBdRTkFbqAsgMYlgW3/AWwzWhacCy7ICM/ncCuCFbMs7xNCg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793360139; h=Received:DKIM-Signature:Message-ID:Date:MIME-Version:User-Agent: Subject:To:Cc:References:From:Content-Language:Autocrypt:In-Reply-To: Content-Type:Content-Transfer-Encoding; bh=TYrpZVQ/GsvgUGgPVgovKNkkVkoYTgtTPGZXWBcYsUg=; b=wRiofY4YFVAU195FJuXUuHz51RUNmNm23lyavsU+dtpPFXTow+GQWH28/a2vzWRdUaZQ OUwczku1lwuknp7m6RIbNvbxCc/feaM2sMk3e2GRzTwuu1tvCrIPnNmZyjvKIXnCubTck 9/cyDRTh0AAiVrcsiCNJ2MvcLOHfi63FfvzAj6gU7t8kUMe5PUkQ4Pvb0WjWyFKSmbZOP PCvKM69Z7fzpFbEMErNPKM+di6yZ8sIbYa+GFJ1kGOV05xCTstTMLwcsGDWgv9HQR0UQ8 mYhK+fYc41d1oSUhhfAxN5ouKA4DPUyc9YCAsIkmRr8oYtvzFxar6ORcwZmnHNWULdg== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=DV7dP3Zs; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 41A8B606A31C; Fri, 30 Oct 2026 11:35:38 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=DV7dP3Zs Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22A911F00A17; Fri, 30 Oct 2026 11:35:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793360138; bh=TYrpZVQ/GsvgUGgPVgovKNkkVkoYTgtTPGZXWBcYsUg=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=DV7dP3ZsojHaXxJribD0DKo5b4PCOC8FdkRUgYL7R+uUDI7gUjh5A7huogvcG+J6J Nd2e24ltHviS/XzS8gcUIifHgGSepFBRuv4iQmYXeeAYxK+UYFoOtK9BPjb/rX84Qr 2m0GTTuKi6u9uhP3b1UQ55GaUl9OONJ2fbAax8hY8CD97plqv+q5+JNPNO220WD6qK dBbODOTfcboqVXbdiS50rxbmXmGd69ll7rciNrgicqN3QR6abLc4MeZjjSAdK5StQW z/9hzzkTYNBG8Q3t11Zmx8tUQAbm1gypQjVg8uptfgJSeyJf1lNVlen0WpnB2ukvv/ 1WLh2kL5FKdjA== Message-ID: Date: Fri, 30 Oct 2026 12:35:20 +0100 X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 00/47] mm: various (urgent?) fixes To: Muhammad Usama Anjum , Andrew Morton , Johannes Weiner , Michal Hocko , Qi Zheng , Shakeel Butt , Lorenzo Stoakes , Kairui Song , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Baolin Wang , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Kees Cook , Peter Zijlstra , Jann Horn , Pedro Falcato , Hugh Dickins , Pasha Tatashin , Pratyush Yadav , "Matthew Wilcox (Oracle)" , Jan Kara , Zi Yan , Lance Yang , Rik van Riel , Harry Yoo , Alistair Popple , Nico Pache , Ryan Roberts , Dev Jain , Usama Arif , Kiryl Shutsemau , Matthew Brost , John Hubbard , Peter Xu , Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Oscar Salvador , Minchan Kim , Muchun Song , Xu Xin , Chengming Zhou , Chris Li , Kemeng Shi , Nhat Pham , Youngjun Park , Gregory Price , Joshua Hahn , Rakie Kim , Ying Huang , Jason Gunthorpe Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kexec@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-cxl@vger.kernel.org, Josef Bacik , stable@vger.kernel.org, Chris Mason , Thadeu Lima de Souza Cascardo , Mani Tofigh , Samiullah Khawaja References: <20261029-fixes_core-v2-0-a64ce7f83abb@kernel.org> <2f23dafc-43a5-47c9-a819-e696cda6fd44@arm.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: <2f23dafc-43a5-47c9-a819-e696cda6fd44@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 10/30/26 12:19, Muhammad Usama Anjum wrote: > On 29/10/2026 8:32 pm, David Hildenbrand (Arm) wrote: >> See v1 on details. TL;DR various fixes :) >> >> Thanks to everyone for the review! Hoping I can get some more? :) >> >> I am planning on picking these myself, moving them to linux-next fairly >> soon through mm/core.git. >> >> --- >> Changes in v2: >> - "mm/memfd: check for real shmem inodes before accessing shmem state" >> - Call it inode_is_shmem >> - "mm/truncate: look again if a folio left the mapping" >> - Different fix for truncate_inode_pages_range >> - Adjust description >> - "mm/huge_memory: fix zapping migration entries for device-private THPs" >> - Move handling in zap_deposited_table >> - "mm/mmu_gather: fix flushing ranges with 4 GiB or larger" >> - Adjust description" >> - "mm/huge_memory: split huge PUDs when adjusting VMA boundaries" >> - Drop split_pud check >> - Link to v1: https://patch.msgid.link/20261027-fixes_core-v1-0-6f74bec9a5bb@kernel.org > I ran Fastpath, a Linux kernel performance benchmarking framework, on > this series against mm-stable on aws-m7g.metal. (I) and (R) indicate > statistically significant improvements and regressions, respectively. > The results show 10 improvements and 1 regression. Other, unmarked > percentage changes can be ignored as statistically insignificant. Hence: > > Tested-by: Muhammad Usama Anjum Thanks for the results. IIUC it's schbench that shows a possible regression. I would expect that no changes here really affect performance at all (neither positively nor negatively). "mm/huge_memory: fix list corruption when deferred_split_scan() races with deferred_split_folio()" fixes locking, but I wouldn't assume that this matters at all for this benchmark. "fork: take mmap_lock before copying mm_struct" changes locking, but I also fail to see how that would affect the benchmark. Maybe some code layout changes just affect some benchmark on some machines? Because already seeing 10 improvements makes me wonder how that could possibly be. So I'll move forward with these fixes for now and see if we get more reports and could identify actual problematic commits. -- Cheers, David