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Wed, 24 Mar 2021 12:23:58 +0000 (UTC) Received: from [10.36.115.66] (ovpn-115-66.ams2.redhat.com [10.36.115.66]) by smtp.corp.redhat.com (Postfix) with ESMTP id 071FC19D80; Wed, 24 Mar 2021 12:23:50 +0000 (UTC) Subject: Re: [PATCH v5 1/5] mm,memory_hotplug: Allocate memmap from the added memory range To: Michal Hocko , Oscar Salvador Cc: Andrew Morton , Anshuman Khandual , Vlastimil Babka , Pavel Tatashin , linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20210319092635.6214-1-osalvador@suse.de> <20210319092635.6214-2-osalvador@suse.de> <20210324101259.GB16560@linux> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: Date: Wed, 24 Mar 2021 13:23:47 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Stat-Signature: djf3yt4tdwu9qum513g5enqy6zzex9td X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 05A73C0007D4 Received-SPF: none (redhat.com>: No applicable sender policy available) receiver=imf03; identity=mailfrom; envelope-from=""; helo=us-smtp-delivery-124.mimecast.com; client-ip=216.205.24.124 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1616588643-508802 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: On 24.03.21 13:10, Michal Hocko wrote: > On Wed 24-03-21 13:03:29, Michal Hocko wrote: >> On Wed 24-03-21 11:12:59, Oscar Salvador wrote: > [...] > > an additional remark > >>> - online_pages()->move_pfn_range_to_zone(): Accounts for node/zone's spanned pages >>> - online_pages()->zone->present_pages += nr_pages; > > I am pretty sure you shouldn't account vmmemmap pages to the target zone > in some cases - e.g. vmemmap cannot be part of the movable zone, can it? > So this would be yet another special casing. This patch has got it wrong > unless I have missed some special casing. > It's a bit unfortunate that we have to discuss the very basic design decisions again. @Oscar, maybe you can share the links where we discussed all this and add some of it to the patch description. I think what we have right here is good enough for an initial version, from where on we can improve things without having to modify calling code. -- Thanks, David / dhildenb