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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7805ECA0EFA for ; Mon, 25 Aug 2025 17:22:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=5rvZAalDayw76mXlaVcK2G8fQoANSfCHvdaqQVOogfc=; b=N76mdiV9ZYX7En5AmY+XDuHe7H tUsWYbuIZ1/cwhOO1qJNi4MehCBtdGSb+CUCQD9mD1PQj9vmUvoA8W7mTCliWKSUzYfo0BYrPPWg1 oKsRXNUHDNziYsHDtSDhJR01lanSjIpJ3G1OgSBbF0R0JGFuWB+k124rUqhh0e2UqQdf/u+D1EFiw /zP0fx1UvrjM3ZURfPSv4Eel9J7D4quyIfbY1glQcMQgOCMx3EZq9u7vW28Ly/PT0I5yF1Sh+vjIg sN7hSH8QIke+auGRtO9PlkhSrnUQDiqBibjjvs8S4ecbYVIPXZZkLxQBRORjF1ePAu8oR1s29ltUW A9RgZDKg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uqau1-00000008p8z-09Iy; Mon, 25 Aug 2025 17:22:41 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uqZLH-00000008YJO-3fQm for linux-arm-kernel@lists.infradead.org; Mon, 25 Aug 2025 15:42:45 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756136561; 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=5rvZAalDayw76mXlaVcK2G8fQoANSfCHvdaqQVOogfc=; b=X3McIJNDyiwC/khtPVqSX+x9CfNLCr/ucY3WiKZKgScv9wPTdjuvtYKOkX/GbNo7U/rGyB w2F/QRfYIY7g6sUlJmE/0PAh3cKTmnkvC0SXqB6woh2Q0hyQdBsa4x3ayEa5erz10cvVk2 uFIiM25gqEyp3hRpbI0223wh8ZbEQJY= 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-278-5ZjBOTChNv2Ffpxyd0dj1g-1; Mon, 25 Aug 2025 11:42:39 -0400 X-MC-Unique: 5ZjBOTChNv2Ffpxyd0dj1g-1 X-Mimecast-MFC-AGG-ID: 5ZjBOTChNv2Ffpxyd0dj1g_1756136558 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-45a1b0071c1so23793285e9.0 for ; Mon, 25 Aug 2025 08:42:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756136558; x=1756741358; h=content-transfer-encoding:in-reply-to: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=5rvZAalDayw76mXlaVcK2G8fQoANSfCHvdaqQVOogfc=; b=OTsPYCS1mRKqs6chn0iiYp/VSIzD+bCOkUWRdmC4V8ha5WvNltS6xUml9cx92CO/1y +7ugoukarGX027iH+m45fpmFcnHUHNObsUF400HZ3WJZm7ZGaZW0M25Yk4xQ6xCvJXW4 FCpoT4KL+LZq3PCp/n6DqfGe7PbG/IX98M4tRcyz54qIIp+z9duB9PpjE6vaHamqt+P/ r8vD/X17fZR2WpdsivvVx58CtqJROiyaIMXPvMPCeC/eW+uAKmWOsGYtDwZepRwWPbg2 G+Xf0jac/+pN40N0cKE+E1+QAahQTiDdREtQwGHbZ0F8s/OURLoQMs1vb6b6wc0pgdZS NmVA== X-Forwarded-Encrypted: i=1; AJvYcCU8BXw91dNMr2BXrhuWEMXaaHPXciMZukL09wvqXWzyoVtyza3/oMAkFpBoP0sctLqgw5xBPnrMf5C+XJXxf+I2@lists.infradead.org X-Gm-Message-State: AOJu0YxvNkj1PJmBP2ChQoXwMZEjfnEW48d6enJJFTSxoWiuAzry9fj2 gfdKeV5fyk6ztgugzCOi8yD5Ybr7glXkp13LEffi1BT4yQMaP0Nb8z63wgbvIH7R0u6Md2e4TX4 JJxS3l1d82Gw2OQPyRjP+3vLQzeAuv5RXOkYjv/8hauUiL4JcBTLkv+H3nzSDT+bmkLD0CXIZ77 FO X-Gm-Gg: ASbGncvQ5XmYu3+w3mIqMZtqneYY2rq0YTCGdI/9UG8ku2ahbANoE5PFsppIy00z315 wCZSMMW2I4hxK6KDlubDL8uVMYREg/tMU1Ec2QQxuAp9svFg6nhLULF3SKo67JV4uAjS7FHb9wX V43w0Q6tHtpGxftsfZcTZPByPkxapKV5U15rhRiL1h5U3RsnVHkqa16THfeXX0RjiNMbE33zwuJ MiUQ8kActS6IUR1E/R6I3eJFOWMdhfg+6IYek4jldXyxgiKMyyGD5RAvzZ0HTXb0+KY3p7se0QY eou4U+5FD1GXoH1AtJm4rOK49wGDqfyxTght+ETRBR/Ou1KnAGFt9lK1tZTuqlYsQ+MNhLIpQK6 +1jVdcZVmyYIIM53poEjtdstQ7bIWtJwalKLWJomI2dn4lLvYg8MkYu4H5qlUoV7qj+Q= X-Received: by 2002:a05:600c:a344:b0:459:443e:b180 with SMTP id 5b1f17b1804b1-45b51f30f97mr116842425e9.8.1756136557855; Mon, 25 Aug 2025 08:42:37 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEGzUl9/0T2mWXVZgblyhy3uP4lA/MNqA3E39+SzULqMR3WsGlHrWnWezXsHsIiYJtRmIOh8A== X-Received: by 2002:a05:600c:a344:b0:459:443e:b180 with SMTP id 5b1f17b1804b1-45b51f30f97mr116841885e9.8.1756136557395; Mon, 25 Aug 2025 08:42:37 -0700 (PDT) Received: from ?IPV6:2003:d8:2f4f:1300:42f1:98e5:ddf8:3a76? (p200300d82f4f130042f198e5ddf83a76.dip0.t-ipconnect.de. [2003:d8:2f4f:1300:42f1:98e5:ddf8:3a76]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b57444958sm113196675e9.2.2025.08.25.08.42.34 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Aug 2025 08:42:36 -0700 (PDT) Message-ID: Date: Mon, 25 Aug 2025 17:42:33 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 10/35] mm/hugetlb: cleanup hugetlb_folio_init_tail_vmemmap() To: Mike Rapoport Cc: =?UTF-8?Q?Mika_Penttil=C3=A4?= , linux-kernel@vger.kernel.org, Alexander Potapenko , Andrew Morton , Brendan Jackman , Christoph Lameter , Dennis Zhou , Dmitry Vyukov , dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, iommu@lists.linux.dev, io-uring@vger.kernel.org, Jason Gunthorpe , Jens Axboe , Johannes Weiner , John Hubbard , kasan-dev@googlegroups.com, kvm@vger.kernel.org, "Liam R. Howlett" , Linus Torvalds , linux-arm-kernel@axis.com, linux-arm-kernel@lists.infradead.org, linux-crypto@vger.kernel.org, linux-ide@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mips@vger.kernel.org, linux-mmc@vger.kernel.org, linux-mm@kvack.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, Lorenzo Stoakes , Marco Elver , Marek Szyprowski , Michal Hocko , Muchun Song , netdev@vger.kernel.org, Oscar Salvador , Peter Xu , Robin Murphy , Suren Baghdasaryan , Tejun Heo , virtualization@lists.linux.dev, Vlastimil Babka , wireguard@lists.zx2c4.com, x86@kernel.org, Zi Yan References: <20250821200701.1329277-1-david@redhat.com> <20250821200701.1329277-11-david@redhat.com> <9156d191-9ec4-4422-bae9-2e8ce66f9d5e@redhat.com> <7077e09f-6ce9-43ba-8f87-47a290680141@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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 6rAI_gz395kceceIt4N9e7i_iZ6paPknQaOJIqTaPoI_1756136558 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250825_084243_977762_3E2C3E47 X-CRM114-Status: GOOD ( 26.59 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 25.08.25 16:59, Mike Rapoport wrote: > On Mon, Aug 25, 2025 at 04:38:03PM +0200, David Hildenbrand wrote: >> On 25.08.25 16:32, Mike Rapoport wrote: >>> On Mon, Aug 25, 2025 at 02:48:58PM +0200, David Hildenbrand wrote: >>>> On 23.08.25 10:59, Mike Rapoport wrote: >>>>> On Fri, Aug 22, 2025 at 08:24:31AM +0200, David Hildenbrand wrote: >>>>>> On 22.08.25 06:09, Mika Penttilä wrote: >>>>>>> >>>>>>> On 8/21/25 23:06, David Hildenbrand wrote: >>>>>>> >>>>>>>> All pages were already initialized and set to PageReserved() with a >>>>>>>> refcount of 1 by MM init code. >>>>>>> >>>>>>> Just to be sure, how is this working with MEMBLOCK_RSRV_NOINIT, where MM is supposed not to >>>>>>> initialize struct pages? >>>>>> >>>>>> Excellent point, I did not know about that one. >>>>>> >>>>>> Spotting that we don't do the same for the head page made me assume that >>>>>> it's just a misuse of __init_single_page(). >>>>>> >>>>>> But the nasty thing is that we use memblock_reserved_mark_noinit() to only >>>>>> mark the tail pages ... >>>>> >>>>> And even nastier thing is that when CONFIG_DEFERRED_STRUCT_PAGE_INIT is >>>>> disabled struct pages are initialized regardless of >>>>> memblock_reserved_mark_noinit(). >>>>> >>>>> I think this patch should go in before your updates: >>>> >>>> Shouldn't we fix this in memblock code? >>>> >>>> Hacking around that in the memblock_reserved_mark_noinit() user sound wrong >>>> -- and nothing in the doc of memblock_reserved_mark_noinit() spells that >>>> behavior out. >>> >>> We can surely update the docs, but unfortunately I don't see how to avoid >>> hacking around it in hugetlb. >>> Since it's used to optimise HVO even further to the point hugetlb open >>> codes memmap initialization, I think it's fair that it should deal with all >>> possible configurations. >> >> Remind me, why can't we support memblock_reserved_mark_noinit() when >> CONFIG_DEFERRED_STRUCT_PAGE_INIT is disabled? > > When CONFIG_DEFERRED_STRUCT_PAGE_INIT is disabled we initialize the entire > memmap early (setup_arch()->free_area_init()), and we may have a bunch of > memblock_reserved_mark_noinit() afterwards Oh, you mean that we get effective memblock modifications after already initializing the memmap. That sounds ... interesting :) So yeah, we have to document this for memblock_reserved_mark_noinit(). Is it also a problem for kexec_handover? We should do something like: diff --git a/mm/memblock.c b/mm/memblock.c index 154f1d73b61f2..ed4c563d72c32 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -1091,13 +1091,16 @@ int __init_memblock memblock_clear_nomap(phys_addr_t base, phys_addr_t size) /** * memblock_reserved_mark_noinit - Mark a reserved memory region with flag - * MEMBLOCK_RSRV_NOINIT which results in the struct pages not being initialized - * for this region. + * MEMBLOCK_RSRV_NOINIT which allows for the "struct pages" corresponding + * to this region not getting initialized, because the caller will take + * care of it. * @base: the base phys addr of the region * @size: the size of the region * - * struct pages will not be initialized for reserved memory regions marked with - * %MEMBLOCK_RSRV_NOINIT. + * "struct pages" will not be initialized for reserved memory regions marked + * with %MEMBLOCK_RSRV_NOINIT if this function is called before initialization + * code runs. Without CONFIG_DEFERRED_STRUCT_PAGE_INIT, it is more likely + * that this function is not effective. * * Return: 0 on success, -errno on failure. */ Optimizing the hugetlb code could be done, but I am not sure how high the priority is (nobody complained so far about the double init). -- Cheers David / dhildenb