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 CBC37D75BB7 for ; Thu, 21 Nov 2024 04:35:44 +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:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=mKMqxRLlVvUCqserKLr/Bagm1GzwWwOkUXng3lrWCp4=; b=uQpx+9A+5vX/K4Na8r69UsQBHV pdC2Cvs56bOkP52HFzdW8o4cFeM5caTiLdRlkNM4M9A+BPECB98Ymzcdq7tk4cFsIIAdqbStavsLZ mCJY2PE/frbBTkP73MAvPNEAH1G25VYBRLTPYAjRCnr2IlbTZo/ZRCzBl6A96c+4ucuQj81FHBt49 JcRA3Gt2IXCoN4lpn1J4bOnfhQRv8ChWflZgFFS313jD2uE2Rn7H1l3+jS5/aKPisNt+SXjuQmayi UkzX9QU6Mul5d3p9NtMNQEzRaoXp3wTD585WSkXO60gVK0quhBeVngPnwcOlcttvVXUMqbNe0lqOa HSjaSWvA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1tDyuu-0000000GnvI-1m3c; Thu, 21 Nov 2024 04:35:44 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1tDyuW-0000000Gnor-3b7J for kexec@lists.infradead.org; Thu, 21 Nov 2024 04:35:22 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1732163719; 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: in-reply-to:in-reply-to:references:references; bh=mKMqxRLlVvUCqserKLr/Bagm1GzwWwOkUXng3lrWCp4=; b=G30m4Xqn+/rSo/MB7XeH+MeRBIxz8+OWL5o0cRtJH1dqKvS9UIjaheQS1vqfBn2+phdSZv qAALx7PWeirG2cs3i9roykkr6IlHLxK31v5f66H0x7UG0qB82SxszcfdHyF+/6GPHYwHh8 PpK2MwnrvJDM+s7zIFKe2+jArZOiaWE= Received: from mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (ec2-54-186-198-63.us-west-2.compute.amazonaws.com [54.186.198.63]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-629-NE4qc6erMmah3GjoeKhcQQ-1; Wed, 20 Nov 2024 23:35:16 -0500 X-MC-Unique: NE4qc6erMmah3GjoeKhcQQ-1 X-Mimecast-MFC-AGG-ID: NE4qc6erMmah3GjoeKhcQQ Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 51C9B19560AE; Thu, 21 Nov 2024 04:35:13 +0000 (UTC) Received: from localhost (unknown [10.72.113.10]) by mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 77E3B30000DF; Thu, 21 Nov 2024 04:35:10 +0000 (UTC) Date: Thu, 21 Nov 2024 12:35:05 +0800 From: Baoquan He To: David Hildenbrand 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 , Eugenio =?iso-8859-1?Q?P=E9rez?= , Vivek Goyal , Dave Young , Thomas Huth , Cornelia Huck , Janosch Frank , Claudio Imbrenda , Eric Farman , Andrew Morton Subject: Re: [PATCH v1 04/11] fs/proc/vmcore: move vmcore definitions from kcore.h to crash_dump.h Message-ID: References: <20241025151134.1275575-1-david@redhat.com> <20241025151134.1275575-5-david@redhat.com> <120bc3d9-2993-47eb-a532-eb3a5f6c4116@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <120bc3d9-2993-47eb-a532-eb3a5f6c4116@redhat.com> X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20241120_203520_971483_ACB27C1D X-CRM114-Status: GOOD ( 40.99 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org On 11/20/24 at 11:28am, David Hildenbrand wrote: > 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. Thanks. > > > > > > > > > > > > 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. Ah, I missed that about list node. There are list items, list entries and list nodes, I didn't think of list node at tht time. > > 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) Yeah, agree. struct vmcore is a concept of the whole logical file. > > > > > > > > > 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() Yeah, vmcore_range is better, which won't cause misunderstanding. Thanks.