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 C756AC55184 for ; Mon, 3 Aug 2026 15:12:35 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id B91556B0099; Mon, 3 Aug 2026 11:12:34 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id B68F86B009B; Mon, 3 Aug 2026 11:12:34 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id A589D6B009D; Mon, 3 Aug 2026 11:12:34 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 72B286B0099 for ; Mon, 3 Aug 2026 11:12:34 -0400 (EDT) Received: from smtpin05.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 0B5F8A1F60 for ; Mon, 3 Aug 2026 15:12:34 +0000 (UTC) X-FDA: 85060299828.05.A3D8F9D Received: from tor.source.kernel.org (tor.source.kernel.org [172.105.4.254]) by imf16.hostedemail.com (Postfix) with ESMTP id 4CDD318000E for ; Mon, 3 Aug 2026 15:12:32 +0000 (UTC) Authentication-Results: imf16.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=UMv4MQn1; spf=pass (imf16.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=1785769952; b=3xetAN+k/3ecdas2BztSL2kFOHs81j16XjQufC01vkq9wdIT+KYDPRlIftVvTInsFuEFLf 3lee0hAef9ryjuUhd+x2kRc/WjQ+ARntmqPUoQyHCtxzv0ok0B51bSc3LyT6eWbOV1iKFP Kn0/pxX6vEaFwBenXAp9Gfc0qsKaDbQ= ARC-Authentication-Results: i=1; imf16.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=UMv4MQn1; spf=pass (imf16.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=1785769952; 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=HsYnSY7vyOvbrcwkcxBPIWl17p0R0T5Q719oyY34OHk=; b=CqEZ/NEwGavoe8qlqORwArDuD5lzRmPyXGMnP/5bmbHjyd+w0hE33/Jy+z/SL3/hgqTJmv o7bG5+bTTLuVAJTTeB8lVVqNii0tusWUV2aNm/AkwCCOEs16V+O0+jIx5mavykpyt+/h/q gEI9R8EPXlhoP3dumaPV8xC7k3/KYPk= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id C029460AA6; Mon, 3 Aug 2026 15:12:31 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0F76F1F000E9; Mon, 3 Aug 2026 15:12:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785769951; bh=HsYnSY7vyOvbrcwkcxBPIWl17p0R0T5Q719oyY34OHk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=UMv4MQn148Y9ly+5uk5SVNaUY/Dedy+gXUByfpQVRvsb+A+3Y3ehG+AguSawLowjP IaQ6z+ETXRlVqmYwxotNZb9wP04aqE5JLsAEJ7qYhB+feK0bJE0Dgc2t0/qSe10QJM o4ntgi3A6PxGLQ685mXr6PGAuHJ5hzFATLljCNnJn3CVMJlzN6KxF6KQq24GHxm5FT ftlOQw2deT/bER4kqFGByz8TWGJ896w81gNdF9CWErWrZKA9/2x9ZF6Va04oBftsuQ sGIS8oWMdJaqCrKyVG4hVtb2xOBChFyX/S6vQmbPXtxvdN0cFYy7ijALO/8kIe33CV yeZF4LNjgeIWQ== Message-ID: <99037993-ee13-4160-8c87-b6642faea554@kernel.org> Date: Mon, 3 Aug 2026 17:12:13 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 14/41] mm: swap: Introduce lru_add_drain_progressive() To: Sean Christopherson Cc: Ackerley Tng , aik@amd.com, andrew.jones@linux.dev, binbin.wu@linux.intel.com, brauner@kernel.org, chao.p.peng@linux.intel.com, jmattson@google.com, jthoughton@google.com, michael.roth@amd.com, oupton@kernel.org, pankaj.gupta@amd.com, qperret@google.com, rick.p.edgecombe@intel.com, rientjes@google.com, shivankg@amd.com, steven.price@arm.com, tabba@google.com, willy@infradead.org, wyihan@google.com, yan.y.zhao@intel.com, forkloop@google.com, pratyush@kernel.org, suzuki.poulose@arm.com, aneesh.kumar@kernel.org, liam@infradead.org, Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jonathan Corbet , Shuah Khan , Shuah Khan , Vishal Annapurve , Andrew Morton , Chris Li , Kairui Song , Kemeng Shi , Nhat Pham , Barry Song , Axel Rasmussen , Yuanchu Xie , Wei Xu , Youngjun Park , Qi Zheng , Shakeel Butt , Kiryl Shutsemau , Baoquan He , Jason Gunthorpe , John Hubbard , Peter Xu , Vlastimil Babka , "hughd@google.com" , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, Andrew Morton References: <20260728-gmem-inplace-conversion-v9-0-35f9aec2aed2@google.com> <20260728-gmem-inplace-conversion-v9-14-35f9aec2aed2@google.com> <4460e252-b6de-4df3-bea8-0368a9d0f4ff@kernel.org> <60552bee-3326-4917-b00f-5fb7ba3b8adb@kernel.org> 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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: 9f3zfjci9ohxr8yqyia8mg4n8fyre5qx X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 4CDD318000E X-Rspam-User: X-HE-Tag: 1785769952-203570 X-HE-Meta: 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 VjH91b9I wXuOm2/57Mi4PQ+7g8dw91noXvO3hiDne5cNUEPe3Ji/hZmi1WRl5uab48VtBCSV/UoPPhRV0c/mYIM/S4kilaW5+kDtUBWBcHmJA+QrUukX06T45X0AklbYwzVpvcZNTwRrK65KEliTZS6Sw4Jock1rNL6VGvlb+GsgZL9ixdNHWtp0BsOhoAwiwjwN+1wnSHeWZHazcnaemeo6PrDwzUXoR+oHxgbYDwK/HO5LWYHOAVVucvFgqEVmh8f/W7Chy1L2v3mbH/MQBzcyhG3ZYDNWsZ+lWC1L/ys/t8eC4j5cWK4X29pWtb70l9OpqJ8jLnkQiLjzRVMs+1plx9E7ST9AmWnB894B7Z/T2dPZjefHC8f4dzeRDHZTXjQ== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 8/3/26 17:03, Sean Christopherson wrote: > On Fri, Jul 31, 2026, David Hildenbrand (Arm) wrote: >> I sent a fix for the GUP code that always makes us drain right now: >> >> https://lore.kernel.org/r/20260731-check_and_migrate_movable_folios-v1-1-e0002d7b791e@kernel.org >> >> Would the following (agains mm-unstable + fix) work for you? >> >> >> I assume that you'd have to call it as >> >> lru_cache_drain_for_folio(folio, 0, NULL); >> >> But maybe there are indeed extra references that are not reflected in >> folio_expected_ref_count() that you would have to consider? I doubt it, but please check if >> there would be a problem. >> >> There is a small problem for merging: >> >> (1) The patch depends on the fix. >> >> (2) mm/swap.c was moved to mm/folio.c in the mm tree. >> >> We could write what I have below against Linus' tree and have the conflict be >> resolved when merging. Topic branches are unfortunately not yet a thing in MM >> land. > > Are you expecting the aforementioned fix to land in 7.2, 7.3, or 7.4? If it's Andrew wants to give it some more time in -next, so I'm expecting it to land for 7.3. > 7.2 or 7.3, then I would strongly prefer to base v10 on linux-next (where the fix > will presumably land soonish), and target 7.4 for in-place conversion. Then v10> can be applied against an early 7.3-rcN and we don't need to juggle branches > (assuming Andrew is ok taking the proposed patch through the KVM tree). Agreed. We'd also have to get the actual preparation patch into 7.3. I can send it out and coordinate with Andrew. -- Cheers, David