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Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , "Matthew Wilcox (Oracle)" , Wei Yang , Yang Shi , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v4 0/3] Optimize folio split in memory failure Date: Fri, 31 Oct 2025 11:42:19 -0400 X-Mailer: MailMate (2.0r6272) Message-ID: <2F077EE8-9E34-4EE8-B2BB-90FBE5680C05@nvidia.com> In-Reply-To: <20251030204257.13590714dfb2deae8c2f193c@linux-foundation.org> References: <20251030014020.475659-1-ziy@nvidia.com> <20251030204257.13590714dfb2deae8c2f193c@linux-foundation.org> Content-Type: text/plain X-ClientProxiedBy: BL0PR1501CA0015.namprd15.prod.outlook.com (2603:10b6:207:17::28) To DS7PR12MB9473.namprd12.prod.outlook.com (2603:10b6:8:252::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS7PR12MB9473:EE_|CY8PR12MB7730:EE_ X-MS-Office365-Filtering-Correlation-Id: a088ea6d-6dd9-4259-dff3-08de189414b3 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|366016|7416014|376014; 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It improves how >> memory failure code handles large block size(LBS) folios with >> min_order_for_split() > 0. By splitting a large folio containing HW >> poisoned pages to min_order_for_split(), the after-split folios without >> HW poisoned pages could be freed for reuse. To achieve this, folio split >> code needs to set has_hwpoisoned on after-split folios containing HW >> poisoned pages and it is done in the hotfix in [2]. >> >> This patchset includes: >> 1. A patch adds split_huge_page_to_order(), >> 2. Patch 2 and Patch 3 of "[PATCH v2 0/3] Do not change split folio target >> order"[3], > > Sorry, but best I can tell, none of this tells anyone anything about > this patchset! > > Could we please have a [0/N] which provides the usual overview of these > three patches? > > Please put yourself in the position of someone reading Linus's tree in > 2028 wondering "hm, what does this series do". All this short-term > transient patch-timing development-time stuff is of no interest to > them and is best placed below the ^---$ separator. > How about? The patchset optimizes folio split operations in memory failure code by: always splitting a folio to min_order_for_split() to minimize unusable pages, even if min_order_for_split() is non zero and memory failure code would take the failed path eventually. This means instead of making the entire original folio unusable memory failure code would only make its after-split folio, with min_order_for_split() and containing the page marked as HWPoisoned, unusable. For soft offline case, since the original folio is still accessible, do not split it. In addition, add split_huge_page_to_order() to improve code readability and fix kernel-doc comment format for folio_split() and other related functions. -- Best Regards, Yan, Zi