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a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1776323728; 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=8mNIvSUIVKDUnQ5G0PA0CUvX294O0ipoJJUTFwwtVwM=; b=Pe1sdby/tY1j1HCzus0ZdPSvoWK1hyg2XjLBF/v7qEjxqxHfebVeRFE6Shq6JacV2xc8NE UhtgMHfxlOvHQOt9MffiFarqwhCB8ypLfc0M5IgTYulYALDc6eASqAGZuIrbudlPtPKt5i HQP24LOQ3vNF0/gr7Rm91GB1tN3KgeQ= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id A6F8F60126; Thu, 16 Apr 2026 07:15:27 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 796B4C2BCAF; Thu, 16 Apr 2026 07:15:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1776323727; bh=B7pQLuMTV7OzMld6R3PvIrferBs+xTuioGsbXveGCz4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=rXz2Je5d+2JJ2rgst3dHJKj/SSpuBlkLafEfiM6DTI0iew+qwqdW2RUH4kTPe2OfV NuMAedt9WPc6PamjvIcGeGs5FsAbpCvwN+z4GzMdvI7jn5p0vN8v+8TbieYkzFiBIi mhHnQ9ulOcTLqsIuExrCiL3QPX2wkAQfTrTEM+6WDVgWn9CXZ9zUdBPLwxhS6hkKdE hlLJofyy6du/7/YMgD2y/fB3Ah9hO3GzJS1giz6LWTxU1NWxw4LgFxzLe44smD7xMH vsu7WTF3WpCsYl5fFJ2k4jksCrQgCCdPX3hoKZ0McvLOBtuLoIdXNuBc6FLiH7lojB ixXZDSWaFNehw== Message-ID: Date: Thu, 16 Apr 2026 09:15:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] mm/memory hotplug/unplug: Optimize zone contiguous check when changing pfn range To: Wei Yang , Yuan Liu Cc: Oscar Salvador , Mike Rapoport , linux-mm@kvack.org, Yong Hu , Nanhai Zou , Tim Chen , Qiuxu Zhuo , Yu C Chen , Pan Deng , Tianyou Li , Chen Zhang , linux-kernel@vger.kernel.org References: <20260408031615.1831922-1-yuan1.liu@intel.com> <20260416022351.llek76h5cik3nese@master> 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: <20260416022351.llek76h5cik3nese@master> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Stat-Signature: nxetak7xum4m41ewigakh9nhmxczq6nu X-Rspam-User: X-Rspamd-Queue-Id: 6223F2000B X-HE-Tag: 1776323728-792020 X-HE-Meta: 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 A0rzkOE5 MaSJpu7tMDp/O2Aojub6SwnzJtlOQCGx5e+vwtxU0Uqnuy60KZ84N/NI3h1W5Ebas9QAiiP5S1ZeT2nHagTzMuNpTvYaKn3Yh0OtIT7CCrM+/fozIHEJARlZco1GjuVOPtxlrxv3D4ZCKtf0hADtJ39l1ZKcAJnufY6eIrUakEX3mo8aF1IZwvEWRoOiVGdsepcMkWFc4wdkrySXw3o7pRpFhXZBHwpXnrbE7j2ol5kmc01SKGeCbliH21qiTvkjTjCGU+NiBWxq/5Tu+tnVT61lsQ14o8eMQdSoQufGFJOKNi/9rmYM9IYJpvDlTDE25+EWXG+/drkMmv8o= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/16/26 04:23, Wei Yang wrote: > On Tue, Apr 07, 2026 at 11:16:15PM -0400, Yuan Liu wrote: > [...] >> >> /* >> @@ -956,9 +957,22 @@ static void __init memmap_init_zone_range(struct zone *zone, >> memmap_init_range(end_pfn - start_pfn, nid, zone_id, start_pfn, >> zone_end_pfn, MEMINIT_EARLY, NULL, MIGRATE_MOVABLE, >> false); >> + zone->pages_with_online_memmap += end_pfn - start_pfn; >> >> - if (*hole_pfn < start_pfn) >> - init_unavailable_range(*hole_pfn, start_pfn, zone_id, nid); >> + if (*hole_pfn < start_pfn) { >> + unsigned long pgcnt; >> + >> + if (*hole_pfn < zone_start_pfn) { >> + init_unavailable_range(*hole_pfn, zone_start_pfn, >> + zone_id, nid); > > One question here: > > init_unavailable_range(zone_id) > __init_single_page(zone_id) > set_page_links(zone_id) > set_page_zone(page, zone_id) > > [hole_pfn, zone_start_pfn) doesn't belong to this zone. Would this be > a problem? > > But it seems we have already done this for a long time. Right, we just want "some" node/zone for holes that are indicated as having an online memmap. -- Cheers, David