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 C0849C83F26 for ; Wed, 30 Jul 2025 14:04:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3D84C6B0095; Wed, 30 Jul 2025 10:04:39 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 3B0456B0096; Wed, 30 Jul 2025 10:04:39 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 29ED66B0098; Wed, 30 Jul 2025 10:04:39 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 19E416B0095 for ; Wed, 30 Jul 2025 10:04:39 -0400 (EDT) Received: from smtpin15.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id D9E2A1140A1 for ; Wed, 30 Jul 2025 14:04:38 +0000 (UTC) X-FDA: 83721101436.15.17F997F Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf05.hostedemail.com (Postfix) with ESMTP id 6278C100008 for ; Wed, 30 Jul 2025 14:04:36 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UfZDQvUg; spf=pass (imf05.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 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=1753884276; 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=3O2oNAXD8KVY8vBDD4aG+8v/vac45H/32JLje5KhFMI=; b=36YSQ9rs5AIg9m5vWh6f3BbkobXNVXaYdgYT2L73P9t6I4c4nhWDqEb58W0S6gJBEaU42t p3IJCq3/HdziuFtXQJsTpk/7QanNKfx6/fzqVvVy9PalgkZMLIShXyCOcOBgxEuhKEJkbS ZbVrLL1gqnQ7COAeG0/47iQLvQiivmU= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1753884276; a=rsa-sha256; cv=none; b=cxfg9F8i4c07WpiaK2/7/w1qHaxyRb4Pa3mjO4U8lvlbExOt/3RMz4PKmTqNwS+ttiRXuD k7+3mNLwhTVrEyZYhgDtSRDAKfcR7E6PSxgLk3uXmGfaFxfexmmkmb/a+a9WAbScP2mHNA AUwaKZRW7U31vhW7Z3ZKEEBv8UICjPQ= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UfZDQvUg; spf=pass (imf05.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1753884275; 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=3O2oNAXD8KVY8vBDD4aG+8v/vac45H/32JLje5KhFMI=; b=UfZDQvUg7f9QXs/xnStmjnt61mRk8axk+gVKSryqCPhJbGq7YlKzkcSV0XziYMNZP9fGcw XfO7Rp16/qlNa/UGROBHJgvKqqiONCgvjpxFX0gET0rkH4QHNlr7eh7bFlCbtTvKNtOCSB gFQXRZ5coMUUDiMxy8dob7GI688nHT0= Received: from mail-ej1-f70.google.com (mail-ej1-f70.google.com [209.85.218.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-6-Q6mcZNpEPdWkWB0mPkUgDQ-1; Wed, 30 Jul 2025 10:04:34 -0400 X-MC-Unique: Q6mcZNpEPdWkWB0mPkUgDQ-1 X-Mimecast-MFC-AGG-ID: Q6mcZNpEPdWkWB0mPkUgDQ_1753884273 Received: by mail-ej1-f70.google.com with SMTP id a640c23a62f3a-ae6d4c5f798so534675366b.0 for ; Wed, 30 Jul 2025 07:04:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1753884273; x=1754489073; 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=3O2oNAXD8KVY8vBDD4aG+8v/vac45H/32JLje5KhFMI=; b=rhkaW3CjgLA3pM7fIjNyb96hdaFt4Tb76f6h/ALE69upcsrvStIVQzrZ9yLCnBVSiD GZsQHnjuimOmtdb4jojcxKAJgH6GThNf/RxwoRVpp8vZZqGgiYWgZ/p7qvnRJOEtob6o azpxF71S31ETagMg1jKYJpE3iVwxQSFykg8IiY+LsF09/WPB20uCqOgvSjvvmHsLmx5R /ik+JXcsMC3RG3WnPy/eYtn3kR7xf+qwfZEBx30JE9pvydRRclmlukOY0CLWfQjcvmmx nFLN4cT9J7menAl1r281RnvktGSpEIYRmX/SIKDtHFdgihGjN+a1rRKR9Kbb57ass1Zq 1WlQ== X-Forwarded-Encrypted: i=1; AJvYcCWYaW5WpwTmVK7+4oDtjsUlouzzY2pLRSoRTxa2DRVak9UPFURBvCzCmUlc9eVB6+4LjZ0AFQt+3Q==@kvack.org X-Gm-Message-State: AOJu0Yzj9y440j5kQEmMJKhWxsGIWzG/kNkeuaCo2eeOF4SpyBr23A6c dcdeLeoNifPjpIaRgqFkPxMmzktKUHx2GTu4kgkjYf90hfKVOdMAdpyLo/wFxXh81ZSZY3nuOvj ku+iyhI9Lq71pKxiavPJSvmOcefwiOSysnOF1lFolPEf0UvBzyjoyM0FPIkj0j0b+ag== X-Gm-Gg: ASbGncsx5C3ss6XfqqoBfx5Lsl8fAxONNeeyTu92HohH5rVKYup4/5QQEr1emma6lMY aBfR3sRfsSR4rvh93MkceTnq00Yr+bsrcHuh16xsXPik0I/qm4nH2n5Ay968c363iAp5XWBtHAO 1IEEM5MQsWpyMCIOF5DZsEnNtuHcImB+XfUk8qgnJZlVo1GgqATwJgYQiOGCvwWOaHAq4pu+hQS JZR+YmTeaDfyR2I1pSY8MYgpl/98XH0FVoGsB1vYGnhBmgEh3Z0OTidfKo6OmqgZV5Wa+fHAJ2g vCg84bhU0U2Na9jd8XGJzXnCIe4Sdt+J+1P9uz/JnoEb85AZFUoNjoUj3lG/EA== X-Received: by 2002:a17:907:3f88:b0:af8:f9e8:6fae with SMTP id a640c23a62f3a-af8fd9f663amr404270666b.46.1753884272859; Wed, 30 Jul 2025 07:04:32 -0700 (PDT) X-Google-Smtp-Source: AGHT+IH4NPzv48+fUrubCDntYT5pIsBc9DKyFBE7vheDZ6rVTSQBnixNsW4Ss/KjIbgNUx7Mki1uOA== X-Received: by 2002:a17:907:3f88:b0:af8:f9e8:6fae with SMTP id a640c23a62f3a-af8fd9f663amr404265066b.46.1753884272305; Wed, 30 Jul 2025 07:04:32 -0700 (PDT) Received: from [10.32.64.156] (nat-pool-muc-t.redhat.com. [149.14.88.26]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-af6358600a4sm754596166b.25.2025.07.30.07.04.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 30 Jul 2025 07:04:31 -0700 (PDT) Message-ID: <751514db-9e03-4cf3-bd3e-124b201bdb94@redhat.com> Date: Wed, 30 Jul 2025 16:04:28 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump To: Eugen Hristev , linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, tglx@linutronix.de, andersson@kernel.org, pmladek@suse.com Cc: linux-arm-kernel@lists.infradead.org, linux-hardening@vger.kernel.org, corbet@lwn.net, mojha@qti.qualcomm.com, rostedt@goodmis.org, jonechou@google.com, tudor.ambarus@linaro.org References: <20250724135512.518487-1-eugen.hristev@linaro.org> <20250724135512.518487-23-eugen.hristev@linaro.org> 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: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mqjNTDKzU5aku3kEWo4eoxh_biSnLLTEAIxfc71jQZI_1753884273 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 6278C100008 X-Stat-Signature: tcxooo63z4s8peid7azer1h8qbejajb7 X-Rspam-User: X-HE-Tag: 1753884276-812143 X-HE-Meta: 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 1k1z6pcV 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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 30.07.25 15:57, Eugen Hristev wrote: > Hello, > > On 7/30/25 16:52, David Hildenbrand wrote: >> On 24.07.25 15:55, Eugen Hristev wrote: >>> Annotate vital static information into kmemdump: >>> - node_data >>> >>> Information on these variables is stored into dedicated kmemdump section. >>> >>> Register dynamic information into kmemdump: >>> - dynamic node data for each node >>> >>> This information is being allocated for each node, as physical address, >>> so call kmemdump_phys_alloc_size that will allocate an unique kmemdump >>> uid, and register the virtual address. >>> >>> Signed-off-by: Eugen Hristev >>> --- >>> mm/numa.c | 5 ++++- >>> 1 file changed, 4 insertions(+), 1 deletion(-) >>> >>> diff --git a/mm/numa.c b/mm/numa.c >>> index 7d5e06fe5bd4..88cada571171 100644 >>> --- a/mm/numa.c >>> +++ b/mm/numa.c >>> @@ -4,9 +4,11 @@ >>> #include >>> #include >>> #include >>> +#include >>> >>> struct pglist_data *node_data[MAX_NUMNODES]; >>> EXPORT_SYMBOL(node_data); >>> +KMEMDUMP_VAR_CORE(node_data, MAX_NUMNODES * sizeof(struct pglist_data)); >>> >>> /* Allocate NODE_DATA for a node on the local memory */ >>> void __init alloc_node_data(int nid) >>> @@ -16,7 +18,8 @@ void __init alloc_node_data(int nid) >>> int tnid; >>> >>> /* Allocate node data. Try node-local memory and then any node. */ >>> - nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid); >>> + nd_pa = kmemdump_phys_alloc_size(nd_size, memblock_phys_alloc_try_nid, >>> + nd_size, SMP_CACHE_BYTES, nid); >> >> Do we really want to wrap memblock allocations in such a way? :/ >> >> Gah, no, no no. >> >> Can't we pass that as some magical flag, or just ... register *after* >> allocating? >> > > Thanks for looking into my patch. > > Yes, registering after is also an option. Initially this is how I > designed the kmemdump API, I also had in mind to add a flag, but, after > discussing with Thomas Gleixner, he came up with the macro wrapper idea > here: > https://lore.kernel.org/lkml/87ikkzpcup.ffs@tglx/ > Do you think we can continue that discussion , or maybe start it here ? Yeah, I don't like that, but I can see how we ended up here. I also don't quite like the idea that we must encode here what to include in a dump and what not ... For the vmcore we construct it at runtime in crash_save_vmcoreinfo_init(), where we e.g., have VMCOREINFO_STRUCT_SIZE(pglist_data); Could we similar have some place where we construct what to dump similarly, just not using the current values, but the memory ranges? Did you consider that? -- Cheers, David / dhildenb