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]) by smtp.lore.kernel.org (Postfix) with ESMTP id 59230C83F1B for ; Wed, 16 Jul 2025 14:03:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D7BC36B0095; Wed, 16 Jul 2025 10:03:07 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D2C946B0096; Wed, 16 Jul 2025 10:03:07 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C1B766B0098; Wed, 16 Jul 2025 10:03:07 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0015.hostedemail.com [216.40.44.15]) by kanga.kvack.org (Postfix) with ESMTP id B427B6B0095 for ; Wed, 16 Jul 2025 10:03:07 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 5AEE4160487 for ; Wed, 16 Jul 2025 14:03:07 +0000 (UTC) X-FDA: 83670294414.06.B90281D Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf14.hostedemail.com (Postfix) with ESMTP id CA9A9100004 for ; Wed, 16 Jul 2025 14:03:04 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=MyHnWaJU; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1752674584; a=rsa-sha256; cv=none; b=BTDjUJxuWrSNa84zQLP/75kAyxhAxjk6sdHzF13EM9Sv3welxipNrkppuH+tRI4emB9Vhy 1oQ5Fqdoqr00LwzB42jvliCvxDrifZSbTnUbartaIhLPOmZ/HYUlHpvkHNLtELn/Jqn94C diQA2OXYFhPYbrZS7orbCiooDCmxR/k= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=MyHnWaJU; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1752674584; 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=EuCVBPhjjaPKQImXvEwQilBSaIVZ4Esr5XTI8Cdh6E4=; b=eWfQ/mP2Nx2xI3udufR+exssRnvEOZLOr95qP78q8K/0N7iPpyw+/IxlU1SC3GOkHGKmX8 j6SRNP11bnfZ7pXayyd5ST8lj6xT9ZCGPRGUiT1T3kwbV4MEQK3SrRzEqxMJikjCvqkOYt wzQsPYu02SPaJLAECFtSJ07FNda7Rcc= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1752674584; h=from:from: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:autocrypt:autocrypt; bh=EuCVBPhjjaPKQImXvEwQilBSaIVZ4Esr5XTI8Cdh6E4=; b=MyHnWaJU5ofO9kZD2pnpOoJ++sbIJ7mRWz7a6B/NiBmjE94gO+QWOIuCqzRDqRHGs5wPln 4x/bDJsAkJ/+k+LJ2ThwXo1Ke7FUDc0mD8C3D/583isH+bz0LcDQK0oNWnhi+FoKz7da0V /k5cwXiNhHa1DiyfHbkwFiE4KYZ8Ewk= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-663-MBX_PcguOKa8DlWjD3rTSw-1; Wed, 16 Jul 2025 10:03:03 -0400 X-MC-Unique: MBX_PcguOKa8DlWjD3rTSw-1 X-Mimecast-MFC-AGG-ID: MBX_PcguOKa8DlWjD3rTSw_1752674574 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-455f7b86aeeso25860675e9.0 for ; Wed, 16 Jul 2025 07:02:54 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1752674574; x=1753279374; h=content-transfer-encoding:in-reply-to:organization:autocrypt :content-language:from:references:cc:to:subject:user-agent :mime-version:date:message-id:x-gm-message-state:from:to:cc:subject :date:message-id:reply-to; bh=EuCVBPhjjaPKQImXvEwQilBSaIVZ4Esr5XTI8Cdh6E4=; b=llxM/fxmC15WkUliaDUHhv0LsoevX3MR9wrpmDJ5Ny/YwXrHkgKy0/KFjn6Oz6yJNt 2nWNrT4Rjt146nW4Vm4gfc5Q4dNnEji1F9Os7+OueB50UQ/jqHpEMPuSodYkzy+O+zNk xZujZahC7pZXYJ6vToVkj5LPiU4n19xOks6iJOoy0CPV2kkLY6p0L2BSR03nEizk9m8d K4x+2qWrVr+7oJVe0S+nj2lFBCPU3w4yPDWjt9D59+mKaLk++K/BpMyBJafFrIaee8W3 7Iv+tX1eTYwXi6bskmsnlUel2KdTXI3GyiHPgvlbIxnEvD+1N0vyi5p8unJB/Ss5yjB5 8xmw== X-Forwarded-Encrypted: i=1; AJvYcCVwg3emAofQ2of4RFTDBs3r47vIjDIVP3KusfzAs/7QtuOh7W68YVHfgeClAHOxb58Wt40ZC1i9fA==@kvack.org X-Gm-Message-State: AOJu0YzhQEdyOqNQmpdvl/CRk2BFD5u83160D7saz8nF8KKAY6fHM3nY 9z0jSer4RLzF8bXSk9oc+ib4F88ateHze9sl8a3/2BTrLm0gOTGvqI56kzK1/7bLdHrKaw05tyF PV4gPy0ekQRzsQLWMqRIwirD9tgGbxPiLdfCJ0JrK2O39yFh9pOgv X-Gm-Gg: ASbGncs+QL01e63VyGl52EtpvKIZV6kYB6lUkENTzIA7zTUibju09Z+IbcODyT29bqZ TsaNK4npiwdporFPb1UZiusIUreMiY1PYe+rxxJdJ7CesYPLDLmIJsfQpacbOBRQFBGnt5vpwat eFscNk4L7L3qoi4/HfOEIM8jWbb7BglYIaYx8UgMIOAOlH+EEkkY3PS8vXRphYEj/zgelPQRbHe EjR3EDcMl+42nv7HFualG0U7otOike59kWNdJtxWS52EFwSxRoji0+5FsqD8svtNiA2nf32tlnH /C9toGmZIhTtrhch1pSbJCn7pr1Qhlfa85Q8V1xz42YxClOU2CsEmEn7l3VcaBkueTDc5qsnZgp 9jjBO6A4AmnNFQGG6gQP6YNbKUS/vhSBLX1a/8RWXapT82y9EU+lsJT9E1e0T4JS0tdY= X-Received: by 2002:a05:600c:3f14:b0:456:2dc1:a603 with SMTP id 5b1f17b1804b1-4562f70fa2cmr22370245e9.5.1752674568337; Wed, 16 Jul 2025 07:02:48 -0700 (PDT) X-Google-Smtp-Source: AGHT+IE3wX3Mr86IyLqrsIHFVjFgQl73bgijD88nQKbtQxzm3svX1bNi0MOnFgmITQLdAGujToWWNw== X-Received: by 2002:a05:600c:3f14:b0:456:2dc1:a603 with SMTP id 5b1f17b1804b1-4562f70fa2cmr22367085e9.5.1752674565706; Wed, 16 Jul 2025 07:02:45 -0700 (PDT) Received: from ?IPV6:2003:d8:2f1d:ed00:1769:dd7c:7208:eb33? (p200300d82f1ded001769dd7c7208eb33.dip0.t-ipconnect.de. [2003:d8:2f1d:ed00:1769:dd7c:7208:eb33]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45630ec911esm11673405e9.38.2025.07.16.07.02.43 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 16 Jul 2025 07:02:45 -0700 (PDT) Message-ID: <5ff595db-3720-4ce3-8d92-5f08d0625c75@redhat.com> Date: Wed, 16 Jul 2025 16:02:43 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 05/14] khugepaged: generalize __collapse_huge_page_* for mTHP support To: Nico Pache , linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org Cc: ziy@nvidia.com, baolin.wang@linux.alibaba.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, dev.jain@arm.com, corbet@lwn.net, rostedt@goodmis.org, mhiramat@kernel.org, mathieu.desnoyers@efficios.com, akpm@linux-foundation.org, baohua@kernel.org, willy@infradead.org, peterx@redhat.com, wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kirill.shutemov@linux.intel.com, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com References: <20250714003207.113275-1-npache@redhat.com> <20250714003207.113275-6-npache@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <20250714003207.113275-6-npache@redhat.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: aeERpsCED5ZqgcgzBwc-pXg5zU3qQdXvdv1wzSQgutE_1752674574 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: CA9A9100004 X-Stat-Signature: 6ogxi1jeqggd8uqr3oa4344swu85bwy7 X-HE-Tag: 1752674584-301968 X-HE-Meta: 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 Po1/EypW 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 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 14.07.25 02:31, Nico Pache wrote: > generalize the order of the __collapse_huge_page_* functions > to support future mTHP collapse. > > mTHP collapse can suffer from incosistant behavior, and memory waste > "creep". disable swapin and shared support for mTHP collapse. > > No functional changes in this patch. > > Reviewed-by: Baolin Wang > Co-developed-by: Dev Jain > Signed-off-by: Dev Jain > Signed-off-by: Nico Pache > --- > mm/khugepaged.c | 49 +++++++++++++++++++++++++++++++------------------ > 1 file changed, 31 insertions(+), 18 deletions(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index cc9a35185604..ee54e3c1db4e 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -552,15 +552,17 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, > unsigned long address, > pte_t *pte, > struct collapse_control *cc, > - struct list_head *compound_pagelist) > + struct list_head *compound_pagelist, > + u8 order) > { > struct page *page = NULL; > struct folio *folio = NULL; > pte_t *_pte; > int none_or_zero = 0, shared = 0, result = SCAN_FAIL, referenced = 0; > bool writable = false; > + int scaled_none = khugepaged_max_ptes_none >> (HPAGE_PMD_ORDER - order); > > - for (_pte = pte; _pte < pte + HPAGE_PMD_NR; > + for (_pte = pte; _pte < pte + (1 << order); > _pte++, address += PAGE_SIZE) { > pte_t pteval = ptep_get(_pte); > if (pte_none(pteval) || (pte_present(pteval) && > @@ -568,7 +570,7 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, > ++none_or_zero; > if (!userfaultfd_armed(vma) && > (!cc->is_khugepaged || > - none_or_zero <= khugepaged_max_ptes_none)) { > + none_or_zero <= scaled_none)) { > continue; > } else { > result = SCAN_EXCEED_NONE_PTE; > @@ -596,8 +598,8 @@ static int __collapse_huge_page_isolate(struct vm_area_struct *vma, > /* See hpage_collapse_scan_pmd(). */ > if (folio_maybe_mapped_shared(folio)) { > ++shared; > - if (cc->is_khugepaged && > - shared > khugepaged_max_ptes_shared) { > + if (order != HPAGE_PMD_ORDER || (cc->is_khugepaged && > + shared > khugepaged_max_ptes_shared)) { > result = SCAN_EXCEED_SHARED_PTE; > count_vm_event(THP_SCAN_EXCEED_SHARED_PTE); > goto out; > @@ -698,13 +700,14 @@ static void __collapse_huge_page_copy_succeeded(pte_t *pte, > struct vm_area_struct *vma, > unsigned long address, > spinlock_t *ptl, > - struct list_head *compound_pagelist) > + struct list_head *compound_pagelist, > + u8 order) > { > struct folio *src, *tmp; > pte_t *_pte; > pte_t pteval; > > - for (_pte = pte; _pte < pte + HPAGE_PMD_NR; > + for (_pte = pte; _pte < pte + (1 << order); > _pte++, address += PAGE_SIZE) { > pteval = ptep_get(_pte); > if (pte_none(pteval) || is_zero_pfn(pte_pfn(pteval))) { > @@ -751,7 +754,8 @@ static void __collapse_huge_page_copy_failed(pte_t *pte, > pmd_t *pmd, > pmd_t orig_pmd, > struct vm_area_struct *vma, > - struct list_head *compound_pagelist) > + struct list_head *compound_pagelist, > + u8 order) > { > spinlock_t *pmd_ptl; > > @@ -768,7 +772,7 @@ static void __collapse_huge_page_copy_failed(pte_t *pte, > * Release both raw and compound pages isolated > * in __collapse_huge_page_isolate. > */ > - release_pte_pages(pte, pte + HPAGE_PMD_NR, compound_pagelist); > + release_pte_pages(pte, pte + (1 << order), compound_pagelist); > } > > /* > @@ -789,7 +793,7 @@ static void __collapse_huge_page_copy_failed(pte_t *pte, > static int __collapse_huge_page_copy(pte_t *pte, struct folio *folio, > pmd_t *pmd, pmd_t orig_pmd, struct vm_area_struct *vma, > unsigned long address, spinlock_t *ptl, > - struct list_head *compound_pagelist) > + struct list_head *compound_pagelist, u8 order) > { > unsigned int i; > int result = SCAN_SUCCEED; > @@ -797,7 +801,7 @@ static int __collapse_huge_page_copy(pte_t *pte, struct folio *folio, > /* > * Copying pages' contents is subject to memory poison at any iteration. > */ > - for (i = 0; i < HPAGE_PMD_NR; i++) { > + for (i = 0; i < (1 << order); i++) { > pte_t pteval = ptep_get(pte + i); > struct page *page = folio_page(folio, i); > unsigned long src_addr = address + i * PAGE_SIZE; > @@ -816,10 +820,10 @@ static int __collapse_huge_page_copy(pte_t *pte, struct folio *folio, > > if (likely(result == SCAN_SUCCEED)) > __collapse_huge_page_copy_succeeded(pte, vma, address, ptl, > - compound_pagelist); > + compound_pagelist, order); > else > __collapse_huge_page_copy_failed(pte, pmd, orig_pmd, vma, > - compound_pagelist); > + compound_pagelist, order); > > return result; > } > @@ -994,11 +998,11 @@ static int check_pmd_still_valid(struct mm_struct *mm, > static int __collapse_huge_page_swapin(struct mm_struct *mm, > struct vm_area_struct *vma, > unsigned long haddr, pmd_t *pmd, > - int referenced) > + int referenced, u8 order) > { > int swapped_in = 0; > vm_fault_t ret = 0; > - unsigned long address, end = haddr + (HPAGE_PMD_NR * PAGE_SIZE); > + unsigned long address, end = haddr + (PAGE_SIZE << order); > int result; > pte_t *pte = NULL; > spinlock_t *ptl; > @@ -1029,6 +1033,15 @@ static int __collapse_huge_page_swapin(struct mm_struct *mm, > if (!is_swap_pte(vmf.orig_pte)) > continue; > > + /* Dont swapin for mTHP collapse */ > + if (order != HPAGE_PMD_ORDER) { > + count_mthp_stat(order, MTHP_STAT_COLLAPSE_EXCEED_SWAP); Doesn't compile. This is introduced way later in this series. Using something like git rebase -i mm/mm-unstable --exec "make -j16" You can efficiently make sure that individual patches compile cleanly. -- Cheers, David / dhildenb