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 75603FF8867 for ; Wed, 29 Apr 2026 13:07:12 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DB2F66B0092; Wed, 29 Apr 2026 09:07:11 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D63736B0093; Wed, 29 Apr 2026 09:07:11 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C52556B0095; Wed, 29 Apr 2026 09:07:11 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0012.hostedemail.com [216.40.44.12]) by kanga.kvack.org (Postfix) with ESMTP id B238A6B0092 for ; Wed, 29 Apr 2026 09:07:11 -0400 (EDT) Received: from smtpin19.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 7910B40214 for ; Wed, 29 Apr 2026 13:07:11 +0000 (UTC) X-FDA: 84711619062.19.5211246 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf08.hostedemail.com (Postfix) with ESMTP id 6B816160003 for ; Wed, 29 Apr 2026 13:07:09 +0000 (UTC) Authentication-Results: imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uOnPgzdr; spf=pass (imf08.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 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=1777468029; 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=qLVykEX8popI3INkM/HClp0k/ylv5tR6pRXym/OVfIQ=; b=ms9p11Ivnm/+PB766dx91mUub2VMXgNtvyUcSPkD4uE0BFfZ344RV/7XTNkUCsOw2KgsEu AlETTIIf9qR+FCtQ2FbtATnjkfRpEK0Kp7J/qyTUzwIvaktwPnFVmm2XQmrgm5TD2ZkHWx sAWy5Jx+XeYxAJxFuOgrmkMZTcp+4wg= ARC-Authentication-Results: i=1; imf08.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=uOnPgzdr; spf=pass (imf08.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org; dmarc=pass (policy=quarantine) header.from=kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1777468029; a=rsa-sha256; cv=none; b=fwdetKwQ48lPoC3N5GesatHAjjtMtRd2ekjODc/RF4Jh0M7LMio5V1ZzIEtywWGC9Tx+wP AbiAFBPhaeX5CpqjADlvWE1vuVGcTG4iqR5uDxw6uTKn984Ps8gjalfWl8PaVhSFT7td69 ftgy8w2xSA7SWvgEPSWbdEvy3uKpxlY= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 794D240421; Wed, 29 Apr 2026 13:07:08 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 257FCC19425; Wed, 29 Apr 2026 13:07:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1777468028; bh=9IfO9dFLl2+gw78r2mU9NKidJAmghJYd+xDub6xjhhw=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=uOnPgzdrHWG9XGxFAlE7PwEOLqA28j6jXgfXqrPhOS7vq1bxEqAJQ0eqtCieFP/85 GkXWVi5SA9bycIydbMFOaIG5h5bR50xYDpML2lDf06EBxtniMdEp6rTPzNJb2k+Jvk D7SNIaNQGjeDOotsNfmlD6WXJq5kao101xfEdKJR6Uth4nwSZ2Y6M81oncVqfQ0MAK rFr+L2CfjYTe+g/IZKk0c8/RxidT/3LtXBYs3Px/VSuD4ljfeALNQIGNyWv4uFdFLH qi0Bl0L67pLH9A0JfKZxkD0BfWVcMEe2Z4LouPT401mCBzTKpOAOQ6LZp3scOMWcJ7 ZjQ/OCuhZ1Ehg== Message-ID: <4a612d63-2838-40f5-ab67-79bf35dd3a56@kernel.org> Date: Wed, 29 Apr 2026 15:07:04 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 2/3] mm: process_mrelease: skip LRU movement for exclusive file folios To: Michal Hocko Cc: Minchan Kim , Suren Baghdasaryan , akpm@linux-foundation.org, hca@linux.ibm.com, linux-s390@vger.kernel.org, brauner@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, timmurray@google.com, "Liam R. Howlett" References: <7c7da8ae-cd39-4edf-b94f-c79ab85df456@kernel.org> <7f98f461-62a7-455d-a7a8-cb8928465946@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-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 6B816160003 X-Stat-Signature: iqyrapdco57f5rgzk3548qy4jpnzctmj X-HE-Tag: 1777468029-549450 X-HE-Meta: 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 95SPBR7d WG/9DvSBuowbNp40160WuIetklLCgPTAFWYg2IIarjYM6CVb8THjI5cVxlTuz9o8uk7MaM+Wf/XPdR1evzMSRpThchu3aezSWthB6JFu90c5E/5QYxzYyZxdeMPWTyKqHdNQ5cj0YZSH2BGJL9mODie/OxHFGqQ5g9EnBZ0uj/VI8wYHKX5WmdqurYu6I+2k7fIXnSMSb99fv46a+i3K+MAkGUspbgBJCrud7EaVbsJ6U6fOUGxn3SmGTBlVnEQvOg96DL6/1HVGOcV9uj9+GixjligwUIUiomNMEoAyAPiR/hxm8BgZ9BgZz2Q== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/29/26 12:33, Michal Hocko wrote: > On Wed 29-04-26 11:09:55, David Hildenbrand wrote: >> Unrelated stupid question: would things be clearer if we could rename >> MMF_UNSTABLE to MMF_OOM_REAPING once figure out whether aborting fork() still >> really needs it? > > While the oom is the only current kernel user of MMF_UNSTABLE (in a > sense it sets the flag) the flag should denote that any page faults are > reliable because it might fault in a fresh memory and user would lose > the previous content without knowing that. Not sure MMF_OOM_REAPING > would reflect that reality better. We use it for failed fork() as well, but that's slightly different semantics (no real page faults ever made sense). Looking at the original patch here, using MMF_OOM_REAPING to modify zapping behavior would be clearer than MMF_UNSTABLE, I guess. But I see your point regarding kswapd interacting with this. -- Cheers, David