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 9767ACCA462 for ; Fri, 16 Oct 2026 08:11:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 944BD6B0088; Fri, 16 Oct 2026 04:11:43 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 91C2F6B008A; Fri, 16 Oct 2026 04:11:43 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 80C0C6B008C; Fri, 16 Oct 2026 04:11:43 -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 65E816B0088 for ; Fri, 16 Oct 2026 04:11:43 -0400 (EDT) Received: from smtpin20.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay01.hostedemail.com (Postfix) with ESMTP id DC0431C0B2C for ; Fri, 16 Oct 2026 08:11:42 +0000 (UTC) X-FDA: 85327770444.20.40692F3 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf19.hostedemail.com (Postfix) with ESMTP id 4ADF61A0006 for ; Fri, 16 Oct 2026 08:11:41 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Y9Qc3KBd; spf=pass (imf19.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@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=1792138301; b=U+6NKTOpDMz7gqIBIQ32MbhJnHcL0j2ZQNbadsnTTDTveKWjfUZv0n5DRFkIYLFBhOIc8Z qWtAqdGPawPQCFfvQxg5aQoWZNdxGK5mSCblWMi3HDsJWozi6G7eW0LM7C+k8o3Hr6MnPt td9bVbBEFzG2FYQ3cFtYwvp50+Z8tqs= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20260515 header.b=Y9Qc3KBd; spf=pass (imf19.hostedemail.com: domain of ljs@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=ljs@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=1792138301; 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: in-reply-to:in-reply-to:references:references:dkim-signature; bh=BBGAT7ue9VgHZMuu5dAb/6oFafAsXIvH9NDdySY61DU=; b=p2fNfqSmXSSxhDbHnL5GeqSHMKIFhRuyVEeqsn8A30//giD9by7mxq10dnEudn77MlogCb rHh2Yh9XQmNxWvYq5bj1q0iHBumy9BMakUOO8chSaYAQYSj5WIA9gNcnTzR0elOJgrHN5H 2H6MxkkyYc4gP6gEiyO1Y9f2EaT12ME= Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 7F8444048F; Fri, 16 Oct 2026 08:11:40 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 886951F000C4; Fri, 16 Oct 2026 08:11:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1792138300; bh=BBGAT7ue9VgHZMuu5dAb/6oFafAsXIvH9NDdySY61DU=; h=Date:From:To:Cc:Subject:References:In-Reply-To; b=Y9Qc3KBdcZWgZjWsaAYnSgSER1uaz+BaIQ2eo8wOVW2XevFfSrviKphX0IpLqNOQU J3rNGys0fEfxFxyjD6NGhqth8kxZet5yd4j+UsdTVoDsSdZuH5UcQuNWzG+QRh8swv egdH5IAmn6eWndutGah39BCtH0vUezekNLRCZ/vEUFLRL0T+VyKxINBN8U8s7r7QoL 3wBKxEC7c6UUQPYd9jPvqWr8zcYJY9m+RumfPmgmejL/Q6Fnj+lTXXDJjsOwGOZJbn jdxy1IRC7v4xAjsIrHPzHSTtR+yWxvhHddNJlK4RSEzryGAgYkHiU9392IxR1qvkkX GGXM7I2+M3iDA== Date: Fri, 16 Oct 2026 09:11:30 +0100 From: "Lorenzo Stoakes (ARM)" To: Andrew Morton Cc: Nimrod Oren , David Hildenbrand , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Jonathan Corbet , Shuah Khan , Randy Dunlap , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Kiryl Shutsemau , Brendan Jackman , Johannes Weiner , David Laight , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mm: stop recalculating min_free_kbytes once set by userspace Message-ID: References: <20261014140859.1006967-1-noren@nvidia.com> <20261014144823.8c89da26c547fa95936a2fe5@linux-foundation.org> <26103c38-7b22-4176-8bc3-63e4b8fc6bbb@nvidia.com> <20261015173826.e7ffb7333fb84f5be927ae88@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20261015173826.e7ffb7333fb84f5be927ae88@linux-foundation.org> X-Rspam-User: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 4ADF61A0006 X-Stat-Signature: w6iozujk986kyi4fbfpp57pq6imjha5r X-HE-Tag: 1792138301-809383 X-HE-Meta: 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 zagYEhSv J2YCfLio7vghU1QbYTu/P4yM6bSu0TEIhRq4ehomP1+Toi2xB2qEZgzUlAKNbG5d3ekDWkir/KFq/5kQv4XYU3d3VvFX5T6Cm4aLcx1hZx39mXJUFW3Y9PxkqP0DOotMi6gaYBpBwkQs3evSBlMEB/qx/jrQXPaGN1RCRjykDfHQT8W/A4lAmItOMQTZFJ+1sa1w/+zYG376wFnlTOXlQWyTt8hzCuvN3iuoj0cl+Fi5S5Ph2/xvBsHn7WzHMQqdL59y3jezh5uGXpyCl60vps224LkHekYBcgkiqWCFPqcuZ6bPnDjnHaGEIzA2CUY0O1kKrAAKE66H36pyBVtRKPmvAzZcG+g5S03AdDuHhq8fLZsdVwaSohgaEqg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Thu, Oct 15, 2026 at 05:38:26PM -0700, Andrew Morton wrote: > Do you (and others) feel that we should backport this? Or is it just > not applicable to real-world users of older kernels? > > If we expect there to be non-zero users of 64k-page kernels on older > versions then I think "yes, our users will benefit from this". This is a functional change, so I don't think a backport is appropriate. We add useful stuff in newer kernel versions all the time :) users who wish to benefit from them need to update their kernels. -- Cheers, Lorenzo