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 1464FCCA476 for ; Fri, 10 Oct 2025 18:05:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 6B2078E004A; Fri, 10 Oct 2025 14:05:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 689F48E000A; Fri, 10 Oct 2025 14:05:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 5C6A68E004A; Fri, 10 Oct 2025 14:05:44 -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 4AA898E000A for ; Fri, 10 Oct 2025 14:05:44 -0400 (EDT) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay02.hostedemail.com (Postfix) with ESMTP id C56FA13AEA7 for ; Fri, 10 Oct 2025 18:05:43 +0000 (UTC) X-FDA: 83982982566.23.94A09F0 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf12.hostedemail.com (Postfix) with ESMTP id 20B6640017 for ; Fri, 10 Oct 2025 18:05:41 +0000 (UTC) Authentication-Results: imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=k2Db1sDw; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of mcgrof@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=mcgrof@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1760119542; 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=LFQnRq75O6hFgaOQaSTP3rqTuOiLz78g29oWZzoZQss=; b=OB0/Oc+YmuzymZEZJlBKIFjKxhGS7FEG1snUUYL4ZjREVTjPzGt5Fm7ULOQjlY/uv6Bzaf R3gkjdyar+NUh8KlPOycMn/DDKn1KkHA8AE5EIrTq4oaiHr0NzyZJDQrF42J1fe7uMH5q0 xuUBgl1MDF1Tib2swVYa4RmSrpn2Bz8= ARC-Authentication-Results: i=1; imf12.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=k2Db1sDw; dmarc=pass (policy=quarantine) header.from=kernel.org; spf=pass (imf12.hostedemail.com: domain of mcgrof@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=mcgrof@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1760119542; a=rsa-sha256; cv=none; b=pR1W2kBBVMMrTqFgp89H5dDe1/RjGaqRXBDZIbp8RcuYpIp884HNxOOgahzpiwUd9FD2RX g+2BxdgUAD0fJeFr+4demALL0u+52+XDqBG3Pp+YE8K+dhZ5GOniJYoFZbB5lKppvKHVQI HEjkgpFY5VpEgpkLW/Mipptcmfh5/6k= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 15928419B6; Fri, 10 Oct 2025 18:05:41 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69C6BC4CEF1; Fri, 10 Oct 2025 18:05:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1760119540; bh=bXaAtd0ZAtT3g66t4s1DrZe7nl/S25MHh/OuCmnvSnI=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=k2Db1sDwNDpgB00o01QYKVNREYyMnv61ip//HC1HGaWSaZ5p97cKFfQn23vZ5NwHX pPvaMi3oITNCQIOihRHjgzxjl9z5ANOQK2d2vJTgKAC1+uiCrq5Nkf96s6UGdKB68X ssljcFmuLsUQ0s9OQkNYZ0zkV+QDoua++XRffKP2YTble2bOGzGPU/0XZbQb7zkGkW UzSq2crCL4CGfofdYxiFC1Ja2+DlXPwpllL77bQ45xutQ0tYL26zeatdPQBipEDR3Z Y0rQEvQWjtDNAMY96oBh1Iznk8UIJ0R9eI11CCl8OL7ephE5IGIzQlDITZcLQz8Puy Wgum2S2XB+I/A== Date: Fri, 10 Oct 2025 11:05:39 -0700 From: Luis Chamberlain To: Zi Yan Cc: linmiaohe@huawei.com, david@redhat.com, jane.chu@oracle.com, kernel@pankajraghav.com, syzbot+e6367ea2fdab6ed46056@syzkaller.appspotmail.com, syzkaller-bugs@googlegroups.com, akpm@linux-foundation.org, nao.horiguchi@gmail.com, Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , "Matthew Wilcox (Oracle)" , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH 2/2] mm/memory-failure: improve large block size folio handling. Message-ID: References: <20251010173906.3128789-1-ziy@nvidia.com> <20251010173906.3128789-3-ziy@nvidia.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251010173906.3128789-3-ziy@nvidia.com> X-Rspam-User: X-Rspamd-Queue-Id: 20B6640017 X-Rspamd-Server: rspam03 X-Stat-Signature: bjyknsdwyktndueckswram8moqcanxtk X-HE-Tag: 1760119541-355385 X-HE-Meta: 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 V5XYCom9 0Y4J3BSVBIjWHjomd90KeUeKLvUe9C3EflLVQHscEdgKmhEZyPlWZq2EAvcDrNcYs1lLcwbh/hpH/g+8PM0Bf7sGGocMpBzhPMxHRofv4Ae9VKk92u3fPA6XTrERFM/gIOyN+rRwXye8KauRkCDBWUG2Ghe5tUrfGgi2HuXULHRmvZqHrarqzQ1cSr7p9N2qdbcGDKeUq6731n7yHaRMLohoiUwnZKg6ue1ncjyPIvi4wcf7/ZK91n0kvW1gy7FQEtdQ3PY27ETTqWts5QyOVNtw/Rq0hR1QT5sThv/cYH7Fq0YGonHjih0Svh16l8y1HYVsQS1iaKf298EgvKRM+3i399h3lQVHJfTBzXLQKjyYpIl9MQ2xJWUwY1/XHqp+lfvWP X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, Oct 10, 2025 at 01:39:06PM -0400, Zi Yan wrote: > Large block size (LBS) folios cannot be split to order-0 folios but > min_order_for_folio(). Current split fails directly, but that is not > optimal. Split the folio to min_order_for_folio(), so that, after split, > only the folio containing the poisoned page becomes unusable instead. > > For soft offline, do not split the large folio if it cannot be split to > order-0. Since the folio is still accessible from userspace and premature > split might lead to potential performance loss. > > Suggested-by: Jane Chu > Signed-off-by: Zi Yan Reviewed-by: Luis Chamberlain Luis