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 3F1C3ED7B96 for ; Tue, 14 Apr 2026 10:20:33 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id AB05E6B0088; Tue, 14 Apr 2026 06:20:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id A88446B008A; Tue, 14 Apr 2026 06:20:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 99DB26B0092; Tue, 14 Apr 2026 06:20:32 -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 89CB86B0088 for ; Tue, 14 Apr 2026 06:20:32 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id 2CF6C58B11 for ; Tue, 14 Apr 2026 10:20:32 +0000 (UTC) X-FDA: 84656767104.04.D0C6F46 Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by imf07.hostedemail.com (Postfix) with ESMTP id 4242C40002 for ; Tue, 14 Apr 2026 10:20:30 +0000 (UTC) Authentication-Results: imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="Za1ua/c2"; spf=pass (imf07.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=1776162030; 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=0h7ODnzRoQxwwbG4YgZDOIQbuA7NP+BVAo5B7S2hcU4=; b=ejj7n1/BDvkR8rIW7EZYSqsERtOSHJt80Ouhw/ucv0MuFlDazQj38mXrK9irQw2YJS0IA5 ULX8wI47UntigQHJuToLGiGE4c62P1LVBN4c/KtIp7V3b7fsMltjmNJ9huwbacOqiUOuMn +WoLRD687ISRp0eXlS5nRsgox/pNmQw= ARC-Authentication-Results: i=1; imf07.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b="Za1ua/c2"; spf=pass (imf07.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=1776162030; a=rsa-sha256; cv=none; b=Sx7cN1wEPqakLj0IUtIEbbDOx7mE2ORoaSf/rGxQ4T2QtVm8cJYeUtYrKhfQ3hd6jg3PSb ZLBFD6G21XM6g7/edx8ypDfY4kXWhCIBlcjz8WkH5ZDaG0T07oGKcU8vDF6xjHYYv9/2BV 2v/atNSBTFxo+lIjI7QymGpUrgk/FmE= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 3FFC542DDE; Tue, 14 Apr 2026 10:20:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AADE4C19425; Tue, 14 Apr 2026 10:20:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776162029; bh=RGgiwNNKERTEHoOTPwB9B49AuENlAfKt7sU34JQ6brg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=Za1ua/c2pBc2SFfHoE9LK94I5v2vvCEqP+T0fD3yg+NZGgSkqjcAQQxDo2PuyT0Oz 7kSmatnHBwa1r7/ybCAH/w3+bmRIPw1+TfawF6oZs78YEU1C67uRFNC6NrS+8MJKST 09IcwKF/jVZTrrrd8G6cO1uwfujb/jWnDqH9tBmvTRMN4N9zXYVYfHqjTwVAFSPH+F uqP1+HavbMfQufGK87I6hQNJp4AAFX4pxRtSjSbq3k/zBJjZ8CthPl/3tGhb2QAOUg LKkUF/rIlqdQsvMRkME8GYw7YHGfvaO7yVdIYxOiqU8wOYc+5HQ7lO/DNl/LzqSkBw syvj5qllWnvuw== Message-ID: <45d8e6d2-66f3-4ce9-8f01-7c47cd81e4e5@kernel.org> Date: Tue, 14 Apr 2026 12:20:19 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 7.2 v2 01/12] mm/khugepaged: remove READ_ONLY_THP_FOR_FS check To: Zi Yan , Matthew Wilcox Cc: Song Liu , Chris Mason , David Sterba , Alexander Viro , Christian Brauner , Jan Kara , Andrew Morton , Lorenzo Stoakes , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org References: <20260413192030.3275825-1-ziy@nvidia.com> <20260413192030.3275825-2-ziy@nvidia.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: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4242C40002 X-Stat-Signature: nkyhwcf1gn5i8hp455atf7qk6ydhaqds X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1776162030-735651 X-HE-Meta: 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 ncYHEULH jgggp//fn3xtZoEWSpcJlkd61qGJwQj0EWUZP53UB0yK9CYY5M1gssMaiU96JDl4HPEu4BgTDrCkpPH/yICnIhTFpPH6VbTNYxSAROaGiD5ABx3NhXMa4Y4/BfDwyS+LyQVW2RdRxuIRZ6cmGm5Md8vrPjlnxB46Egoniwvw0Fbd5mIRe8jxCrR+Pywm3ihhWFe1JNcjT4hWou9D88h8oL2azTw1xxhVcY784UIhjlOSy9bt/KcfBZ7E5s+ptsTL+Lv0HVO5X4MQSH2pRd0ILE2tdF8xXzDkJDkSSANNhtiTq74V7Opu9CP1UDsvRW2mcGMJZEhYBtA4vMfIqKLwmK02v7mwNkj1hkEGTWIw0xNj++g4= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: >> huge=never Do not allocate huge pages. This is the default. >> huge=always Attempt to allocate huge page every time a new page is needed. >> huge=within_size Only allocate huge page if it will be fully within i_size. >> Also respect madvise(2) hints. >> huge=advise Only allocate huge page if requested with madvise(2). >> >> so what's the difference between huge=never and huge=madvise? > > I think madvise means MADV_HUGEPAGE for the region, not MADV_COLLAPSE. Yes, most likely. The doc is quite old. -- Cheers, David