From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.subspace.kernel.org (Postfix) with ESMTP id DBE45606A335 for ; Fri, 30 Oct 2026 11:35:42 +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 kanga.kvack.org (Postfix) id E156C6B05B1; Fri, 30 Oct 2026 07:35:41 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D9F7F6B05B2; Fri, 30 Oct 2026 07:35:41 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C18C46B05B3; Fri, 30 Oct 2026 07:35:41 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 99C056B05B1 for ; Fri, 30 Oct 2026 07:35:41 -0400 (EDT) Received: from smtpin19.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay10.hostedemail.com (Postfix) with ESMTP id 2A65BC0693 for ; Fri, 30 Oct 2026 11:35:41 +0000 (UTC) X-FDA: 85379087682.19.1D0FE0F Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf25.hostedemail.com (Postfix) with ESMTP id 75F0AA000B for ; Fri, 30 Oct 2026 11:35:39 +0000 (UTC) Authentication-Results: imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=DV7dP3Zs; spf=pass (imf25.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1793360139; 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=TYrpZVQ/GsvgUGgPVgovKNkkVkoYTgtTPGZXWBcYsUg=; b=a73/zzjP3ZHXtDpqXbAllRk24fTncMlhiqd/Mbv51gPAm8sRZCUnoiX0xm7vpc/sijCwwW SEYd8iMZtrW1JBX4Ru6xoEmv8iSxCRXeZaiJIKaEX+04ARDDAfWzdfOq11yW/KBYBlh9AH QCcSA7fh32zzNa75Qehm+XZf2lW9Y2k= ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1793360139; b=1Qq9awDbr/epm3BHQbKAGBubMwClhdOAkOn1QRd46AUGz3T3tKzwRePphfMAUu7pUWSYDM k75zLsiVJTXWOdwMuJLU4nFdXr/0KXTQQYpvLUbPGKJeXLvRWYsBoTEPUfE1wlD7sUHLCV PKGL166TpRk8AG1df51FHBwKLUw7MvQ= ARC-Authentication-Results: i=1; imf25.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=DV7dP3Zs; spf=pass (imf25.hostedemail.com: domain of david@kernel.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id DE129602CC; Fri, 30 Oct 2026 11:35:38 +0000 (UTC) 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-Archived-By: 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; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 75F0AA000B X-Stat-Signature: ibxanoch5byimskd5t55tmbeco6z7yhw X-Rspam-User: X-Spam-Status: No, score=-12.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,MAILING_LIST_MULTI,SPF_HELO_PASS,SPF_PASS, USER_AGENT_SANE_1 autolearn=unavailable autolearn_force=no version=4.0.1 X-HE-Tag: 1793360139-66834 X-HE-Meta: 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 EAy6oqH/ 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 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