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 17F6DD63923 for ; Wed, 20 Nov 2024 10:28:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 945AE6B007B; Wed, 20 Nov 2024 05:28:46 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8CF606B0083; Wed, 20 Nov 2024 05:28:46 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 720C36B0085; Wed, 20 Nov 2024 05:28:46 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 4C1CA6B007B for ; Wed, 20 Nov 2024 05:28:46 -0500 (EST) Received: from smtpin22.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay05.hostedemail.com (Postfix) with ESMTP id BD719409FB for ; Wed, 20 Nov 2024 10:28:45 +0000 (UTC) X-FDA: 82806098298.22.B45D125 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf27.hostedemail.com (Postfix) with ESMTP id 039604000A for ; Wed, 20 Nov 2024 10:27:48 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=O8b7asPs; spf=pass (imf27.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1732098373; 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=PUhTKpUDbhefVJVke+txqNXrs01kWRaTISFE+/T9pRw=; b=s+ZWd36BxLUFyS07m39+86gAcn4zq6MpgJIVTNreObLKBG08wF9cmkgwZe2OwVyP7JAzJC KrjtOq3W/n4hOqObq0yYELtP78DOrHWEOwAxD6qOvJh56JahwruF81F/Vfmz5F8IOoMvxL 7lsz4tLzV/pD0GKDRiVCAREg/URnL9c= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1732098373; a=rsa-sha256; cv=none; b=B8eRoS6+ONnqShAnLBkZdYVRULwenRTJ17k1lo8KAG8/SGbvApTlAsHs/H0k4F6UiiINvG 4WXmvIBtxt3fu51SSuizGA6Pn/lhMhmT92hqMCK/nmUYFak9jeRUl8oQT4k95INioVKqur wbFSzZYdPFJVv24Tly2FMqgunyEMfC4= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=O8b7asPs; spf=pass (imf27.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732098522; 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=PUhTKpUDbhefVJVke+txqNXrs01kWRaTISFE+/T9pRw=; b=O8b7asPsXfez3M2avmfMGvsFucr77T664tv5CKsCeSSm/EGlFry1p8KUWXfXzc4JGa346O XUxVyF91uqii4CUEyuDEO9stamF/YDY5c964+cy40jxBSNDQwoblcWT8r8ORMbgWHMwEVM 4BAkNB64z5L2RvHQe6oeiT8UaYnuyZI= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-46-Zi27wNUgOJqNeCmgOPy9Qg-1; Wed, 20 Nov 2024 05:28:41 -0500 X-MC-Unique: Zi27wNUgOJqNeCmgOPy9Qg-1 X-Mimecast-MFC-AGG-ID: Zi27wNUgOJqNeCmgOPy9Qg Received: by mail-wr1-f70.google.com with SMTP id ffacd0b85a97d-38236ca50d5so1836814f8f.0 for ; Wed, 20 Nov 2024 02:28:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732098520; x=1732703320; 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=PUhTKpUDbhefVJVke+txqNXrs01kWRaTISFE+/T9pRw=; b=gN6Va4hMBXZZLELUKGeoJUkAwMtYrhVRtBeirnTMN6dkLpM4Q26bF563MJgo52UsSj L5tEBZhHR5bxwpIdsALNGBgKPdQurlJXxHGOuknNQqjnaAzu+YIZyfdRK1swY1X7xUfh TGMFUMH+KV4P4A8Q2YjVEX9uBg1ALp2gQ+8j/LO4HlhL6RdsvtUFdry3EX1YO+mPxLw0 Udt0a/wpRzId6O3i77jerf3OsgXMhgPid1iVftRLoDysGFkWqeZoZDTJyrnXVh3h53i6 ukDIW9YCah6XiCSrIokyda0pRagbHaXgrz2RfeAJjabcueOjVS4aWjCR+ZwZy9bSmGu3 H6iw== X-Forwarded-Encrypted: i=1; AJvYcCW4HtYRB9/hPM9ce/0I2KOZ2flSBgZOi2OhzyxeYYsK2xLrUJw5VGczdeXjMtWYd1uawowQWzFN+g==@kvack.org X-Gm-Message-State: AOJu0YxnZLvCB6AJgJ/KdmR4Jt3/+O5Nqavwp1VIUxveulGx6K8ZdU7u mUPuu+iOpoVpxuDKKNUpJx6py2LNMPk6OF1a9jld4D7eAquTpeEHyRyWQHCDUan2C3Rde+vdSbb yDlF9rs9/cuKO673JvEsZ8i7Pqvdp4/6KbQb74F9w9RdYdGf5 X-Received: by 2002:a05:6000:1a8e:b0:382:4fb2:cc94 with SMTP id ffacd0b85a97d-38254adf53cmr1274919f8f.4.1732098520153; Wed, 20 Nov 2024 02:28:40 -0800 (PST) X-Google-Smtp-Source: AGHT+IEJoRBPwyp9lbtADpyi1/+1hdX8YzDdgEC7iCXuHcfB/2DagZJPkXBzcXmpmHY2eSLwEvZ0XA== X-Received: by 2002:a05:6000:1a8e:b0:382:4fb2:cc94 with SMTP id ffacd0b85a97d-38254adf53cmr1274884f8f.4.1732098519755; Wed, 20 Nov 2024 02:28:39 -0800 (PST) Received: from ?IPV6:2003:cb:c705:4200:ce79:acf6:d832:60df? (p200300cbc7054200ce79acf6d83260df.dip0.t-ipconnect.de. [2003:cb:c705:4200:ce79:acf6:d832:60df]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3825493e9bbsm1628011f8f.94.2024.11.20.02.28.38 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 Nov 2024 02:28:39 -0800 (PST) Message-ID: <120bc3d9-2993-47eb-a532-eb3a5f6c4116@redhat.com> Date: Wed, 20 Nov 2024 11:28:37 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 04/11] fs/proc/vmcore: move vmcore definitions from kcore.h to crash_dump.h To: Baoquan He Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-s390@vger.kernel.org, virtualization@lists.linux.dev, kvm@vger.kernel.org, linux-fsdevel@vger.kernel.org, kexec@lists.infradead.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?Q?Eugenio_P=C3=A9rez?= , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton References: <20241025151134.1275575-1-david@redhat.com> <20241025151134.1275575-5-david@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/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz 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+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: ChQCuCb2hEejsmmPn2vUkx90QxckQTgLm_3k9gK3cmM_1732098520 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: rspam12 X-Rspamd-Queue-Id: 039604000A X-Stat-Signature: xok9maowbfabyujyxd3rq69b6e6oufpc X-HE-Tag: 1732098468-462656 X-HE-Meta: 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 prJNlVcC DDbimq0KybKOF4Ra1KsgWBghgN3G6oqkD6ubPMD7mVOJEfo/2fjqge1rV4C2JCPQBWRFhZ70MAS4EcyqKLI9c/PqDrUx5Fn0jlWvTC9voUwgBWRNOE63D4mDhcFonfS+5C/M3I1Y5kXJo2nVr0IMc3EJYNRs9U/BHf9Dawnu198/A5PGl49HmRuZUlcUvEQ72XBiHjmygfHOJigwswYLWUsNSUfP5+flHzUNXGkkOf/HoAUwejdNLDqBt7uUNwxcn81UJdfoNguxHIpB9cw/S3qmtpqZOf0dsXpuaQp/q8M9ZPfrZDDY+gnVyBNQPScd6cD5SH+VqrOGL1Sg5emEiTrL5F1uGJirpSv4jJPxNJ2tkxVg7Vsxk3k8LEPJaaz8Rf+PnRXAX/jsZFNdfCepQ6PIuS6Xbq13jRu0gs5EsNAMkblXdwLXUkdFGFLqnrMaefrMr X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, 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 20.11.24 10:42, Baoquan He wrote: > On 11/15/24 at 10:59am, David Hildenbrand wrote: >> On 15.11.24 10:44, Baoquan He wrote: >>> On 10/25/24 at 05:11pm, David Hildenbrand wrote: >>>> These defines are not related to /proc/kcore, move them to crash_dump.h >>>> instead. While at it, rename "struct vmcore" to "struct >>>> vmcore_mem_node", which is a more fitting name. >>> >>> Agree it's inappropriate to put the defintions in kcore.h. However for >>> 'struct vmcore', it's only used in fs/proc/vmcore.c from my code >>> serching, do you think if we can put it in fs/proc/vmcore.c directly? >>> And 'struct vmcoredd_node' too. >> >> See the next patches and how virtio-mem will make use of the feactored out >> functions. Not putting them as inline functions into a header will require >> exporting symbols just do add a vmcore memory node to the list, which I want >> to avoid -- overkill for these simple helpers. > > I see. It makes sense to put them in crash_dump.h. Thanks for > explanation. > I'll add these details to the description. >> >>> >>> And about the renaming, with my understanding each instance of struct >>> vmcore represents one memory region, isn't it a little confusing to be >>> called vmcore_mem_node? I understand you probablly want to unify the >>> vmcore and vmcoredd's naming. I have to admit I don't know vmcoredd well >>> and its naming, while most of people have been knowing vmcore representing >>> memory region very well. >> >> I chose "vmcore_mem_node" because it is a memory range stored in a list. >> Note the symmetry with "vmcoredd_node" > > I would say the justification of naming "vmcore_mem_node" is to keep > symmetry with "vmcoredd_node". If because it is a memory range, it really > should not be called vmcore_mem_node. As we know, memory node has > specific meaning in kernel, it's the memory range existing on a NUMA node. > > And vmcoredd is not a widely used feature. At least in fedora/RHEL, we > leave it to customers themselves to use and handle, we don't support it. > And we add 'novmcoredd' to kdump kernel cmdline by default to disable it > in fedora/RHEL. So a rarely used feature should not be taken to decide > the naming of a mature and and widely used feature's name. My personal > opinion. It's a memory range that gets added to a list. So it's a node in a list ... representing a memory range. :) I don't particularly care about the "node" part here. The old "struct vmcore" name is misleading: makes one believe it somehow represents "/proc/vmcore", but it really doesn't. (see below on function naming) > >> >> If there are strong feelings I can use a different name, but > > Yes, I would suggest we better keep the old name or take a more > appropriate one if have to change. In light of patch #5 and #6, really only something like "vmcore_mem_node" makes sense. Alternatively "vmcore_range" or "vmcore_mem_range". Leaving it as "struct vmcore" would mean that we had to do in #5 and #6: * vmcore_alloc_add_mem_node() -> vmcore_alloc_add() * vmcore_free_mem_nodes() -> vmcore_free() Which would *really* be misleading, because we are not "freeing" the vmcore. Would "vmcore_range" work for you? Then we could do: * vmcore_alloc_add_mem_node() -> vmcore_alloc_add_range() * vmcore_free_mem_nodes() -> vmcore_free_ranges() -- Cheers, David / dhildenb