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 99799C61DB9 for ; Thu, 27 Aug 2026 10:55:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B6FA66B0088; Thu, 27 Aug 2026 06:55:24 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B1FF66B0092; Thu, 27 Aug 2026 06:55:24 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A37976B0095; Thu, 27 Aug 2026 06:55:24 -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 7DF046B0088 for ; Thu, 27 Aug 2026 06:55:24 -0400 (EDT) Received: from smtpin23.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 8CFDB1603A0 for ; Thu, 27 Aug 2026 10:55:23 +0000 (UTC) X-FDA: 85146742926.23.4A2529F Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf24.hostedemail.com (Postfix) with ESMTP id CDE90180005 for ; Thu, 27 Aug 2026 10:55:21 +0000 (UTC) Authentication-Results: imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=WmI6KeFW; spf=pass (imf24.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-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1787828121; b=KxFLtHvlOoBm1T45mWchRiS+ew4VrhBZBpVQQ/f6Q361oug6/3b6tSNXI5qmODFNjgyQ4C ltgEf5KuBXnV/GEVKsmkRGVFUPd77BWaIMN1Sr0VuabSf5ASCz03doc26AmG+wFITxOecS vtzQhGNTnTrbWnl08VWVPsCwHVhaoRo= ARC-Authentication-Results: i=1; imf24.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=WmI6KeFW; spf=pass (imf24.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=1787828121; 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=lOIjdq4+U/tO0XOht7hcXH5DuMTGbl0cEZdAzU3LGMU=; b=BqyXC4jxLKrRectgO8cUkPWsTrCjt7GKzvPL7RrusLaxbMtyh7uNygnIAGS2NvufHU2jOj 4Yi9y9z0CpDl/ABbZgyLR9o4SEz29qLYBjESCEfuSmAAJ6RKGam9epuHj0Fyqo355GeFOu a4gxK98xitAcN1QvSIIxY++GSHHbUWE= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 5CDD5600D3; Thu, 27 Aug 2026 10:55:21 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 092E51F00A3A; Thu, 27 Aug 2026 10:55:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1787828121; bh=lOIjdq4+U/tO0XOht7hcXH5DuMTGbl0cEZdAzU3LGMU=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=WmI6KeFWRxalh2Qorm88ibg25D6VNeXU0rh2PyMvcYJugkGlQw3ypPTW+eM5X/X+a lKpvk4dJ/VQ4mNUOtwd6rab2qzqWg35yVHrZUjgYzPcAGlqHNnx7GbDlNkohro+tjK tAy73M/Ht07J/zQDivOswr7iUtQqX0SLJsbdkBtu8sRcBax1Y8y7i6mysu7ZAjzQ7O td4rdEWYPjvtgs/KBqLTdLy80b87OnYKH7iLsibHXZ9EqIQljx2BjvbYjJsjXPMGFo ELVYp3nicxjDCmV75c/XhNiCkiw4oLgAKpZpPn9eNHJhWKnfNFL7E9NE83svKucEM5 z7rE+fxWMDJpQ== Message-ID: Date: Thu, 27 Aug 2026 12:55:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 3/6] mm/migrate: copy all referenced state via folio_migrate_lru_refs To: kasong@tencent.com, linux-mm@kvack.org Cc: Andrew Morton , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Baoquan He , Shakeel Butt , Johannes Weiner , Michal Hocko , Roman Gushchin , Muchun Song , Chris Li , Baolin Wang , Ridong Chen , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Yu Zhao , Zi Yan , Qi Zheng , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Kairui Song References: <20260826-mglru-flags-cleanup-v3-0-d9f1c75549c8@tencent.com> <20260826-mglru-flags-cleanup-v3-3-d9f1c75549c8@tencent.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: <20260826-mglru-flags-cleanup-v3-3-d9f1c75549c8@tencent.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Stat-Signature: mfdetn1mawqtwkos4pgyifto85hhbsfz X-Rspamd-Queue-Id: CDE90180005 X-Rspamd-Server: rspam06 X-HE-Tag: 1787828121-867991 X-HE-Meta: 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 K0jTby64 KCSD5epHp8erV0PNl44fCqqyTIiHo6IXpFwvwi+sTZMirOLqGHU/vOFL7VER4UyKZm5no7I4JWv0wNpfpJbtuCCKbf1V6mNaELLjNsBsHD5n1bHSB9ufCqfmWBTQCnxr2/vpWg2ALkBUmZIIG6GhJu95xrGO6kG7iwi+jDdU8YWBtXC5GLf3EMxngJe+ufc3+HT08CrwWxx1tJcw1gFZqY4eO1OKbK/TYoDgdxSBPfnMVMmE7AdDb6SdR0ujdFVs6ZFe2ANXOlNvSUWvbIPC1RGQpuHqF8keX9PFBuHTFarpH26y44sIWrjdKwuYUwe57oAqUltlsTmc4bWn9TtLBiRfAAFJ9tKiHCjTo Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/25/26 19:53, Kairui Song via B4 Relay wrote: > From: Kairui Song > > folio_migrate_flags() copies PG_referenced separately from the MGLRU > refs counter, which folio_migrate_refs() transfers. Yet under MGLRU, > PG_referenced and the refs counter bits together describe the > referenced status of a folio. > > Consolidate the two: rename folio_migrate_refs() to > folio_migrate_lru_refs() and let it copy the complete referenced > status, i.e., the MGLRU refs count including PG_referenced, or just > PG_referenced for the active/inactive LRU. Drop the open-coded > PG_referenced copy so the referenced status is transferred in one > place. No behavior change is intended: under the active/inactive LRU > the extra bits are unused, so operating on them is a noop. > > Transfer the reference state first, before the destination folio is > marked uptodate, so a concurrent lockless reader cannot have its > reference update overwritten by the copy. > > Reviewed-by: Baoquan He > Signed-off-by: Kairui Song > --- Acked-by: David Hildenbrand (Arm) -- Cheers, David