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 752A6C88E75 for ; Tue, 15 Sep 2026 00:45:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 296106B0088; Mon, 14 Sep 2026 20:45:38 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 247146B008C; Mon, 14 Sep 2026 20:45:38 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 188496B0092; Mon, 14 Sep 2026 20:45:38 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id DFBF16B0088 for ; Mon, 14 Sep 2026 20:45:37 -0400 (EDT) Received: from smtpin11.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id DB7461C0AAC for ; Tue, 15 Sep 2026 00:45:36 +0000 (UTC) X-FDA: 85214153472.11.3AA6C9A Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf07.hostedemail.com (Postfix) with ESMTP id 2C4B340003 for ; Tue, 15 Sep 2026 00:45:35 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=AAQSvdrw; spf=pass (imf07.hostedemail.com: domain of akpm@linux-foundation.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1789433135; 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=CwnBmXu+Cm2L3rkXgurvwPvyEX3pI8+xK1duHUjRx2Q=; b=28lYR1mMR9D6144QvuSIPkaVvlRP1VPewbIiT6fGx6pLlnNfKI4N8yiG5BxRZIdON5ukxg WzLQyjTRTl7oKn/B59PztNKGNcf1OV2kol79PemVepmmhMT8X/4pSF3lSi2fKgLqYbr7/q 0CIb2xiS8WuaamLeQeROVIoC/xCUDcM= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=korg header.b=AAQSvdrw; spf=pass (imf07.hostedemail.com: domain of akpm@linux-foundation.org designates 172.105.4.254 as permitted sender) smtp.mailfrom=akpm@linux-foundation.org; dmarc=none ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1789433135; b=xNer3IthA45j9fqatKFke9H+vWuHSp9N+FK8ZiOEekytVtTXNvh5Q1DmPeNwc8Pagm1ihp wyqceBDx8iGGdobNkFzYsnGkmOS2fdrvXkjjbc1GUVD71J1wVruIvKf52QTJBViOskDMce 5XAgtma1hkycd2NKRJVV962zjxkwnSA= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 90F4460261; Tue, 15 Sep 2026 00:45:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6FBCC1F000FF; Tue, 15 Sep 2026 00:45:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=korg; t=1789433134; bh=CwnBmXu+Cm2L3rkXgurvwPvyEX3pI8+xK1duHUjRx2Q=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=AAQSvdrwr4NNADTRz+gNg87kWuU5fpErVqpb6tusYGKJQXBNa52EkuXFMdT/Exyhf O+Q7baeJOvVgymMRK/0VXlhBU/Un1yaDTNjXl4sKAMZemU5eK4MsRaPFEJE2jsNCll kTwRXjrYEJ7SBojl6BkHtXL8bBlvirEghTFi+sJw= Date: Mon, 14 Sep 2026 17:45:33 -0700 From: Andrew Morton To: kasong@tencent.com Cc: Kairui Song via B4 Relay , linux-mm@kvack.org, linux-kernel@vger.kernel.org, David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Chris Li , Kemeng Shi , Nhat Pham , Baoquan He , Barry Song , Youngjun Park , Yeoreum Yun , "Kiryl Shutsemau (Meta)" , Shivam Kalra , Kairui Song Subject: Re: [PATCH v5 00/17] mm/huge_memory: clean up and decouple the anon and file split helpers Message-Id: <20260914174533.6b5dba602fb66209a700df09@linux-foundation.org> In-Reply-To: <20260915-swap-thp-cleanup-v5-0-39878b37dfb0@tencent.com> References: <20260915-swap-thp-cleanup-v5-0-39878b37dfb0@tencent.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2C4B340003 X-Stat-Signature: 6o17gdbx3hghzdke3z8hdmszpegywd6r X-Rspam-User: X-HE-Tag: 1789433135-193048 X-HE-Meta: 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 7ARrOp82 6ELu91gZYBLq6ytdAC16VHvET3cqGt/9V9jhxAwfhUrnGn5oeTncMWNb8vKQnNgKUHHYdDppL0kxcWnoF7OFkD29HqUsB5glVsFAN6l6GxTMMetHEUvC3ZEMn+JoHHy/yqBpKJqOjhYPZnJAzPwVl/XjaQoQNPfBMnnCpe4/NHjmg6IwyAv2Ykzvwy+udsuzzq4auA1V5aofv5NeVOMYaITXsOx9Fu6ODZbwgQC8kYOMTYEAzhOlQALj7yMPFLFwpBVOQbDD0RL88POy8p1/qc6+dfR5SemIc+kHtFGkoK8f3fSX9uedbKbgs1ZkZLHw/Bd/zLUL3qoO1BVbzfZqTmAUoBo5SLJiCpcOHUxwgTGQuDEcajTAasjHcK5lBM9jnpmNUNhtLNzHZqEdtPISAQi1K6yLg/omb1ekDZfgvVSBS08MjXsFvueQdf/mmACw75wpCM1mS9MDrlW0= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, 15 Sep 2026 01:14:41 +0800 Kairui Song via B4 Relay wrote: > The folio split path handles anon, page cache and swap cache folios in > one routine. That mixing is what makes the swap cache split > restrictions hard to lift and to review. We now support uniform split to > order-0 only, and no mappingless swap cache folios. And it has left a fair > number of dead or redundant checks behind. > > This series prepares for lifting those restrictions by cleaning up the > code first: split the routine into an anon and a file helper, and keep > all swap cache handling in the anon helper. The file helper never sees > a swap cache folio, folio_check_splittable() rejects them up front. > > Apart from two bug fixes (patch 1 and 2) and a slight adjustment of anon > splitting (patch 12), this is a pure cleanup. Thanks, all queued up in mm.git's mm-new branch.