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Fri, 20 Nov 2020 04:31:08 -0500 X-MC-Unique: fkKSvjRaPlGNpOkGzmTmJg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 8853D8144E1; Fri, 20 Nov 2020 09:31:07 +0000 (UTC) Received: from [10.36.114.78] (ovpn-114-78.ams2.redhat.com [10.36.114.78]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5993460854; Fri, 20 Nov 2020 09:31:06 +0000 (UTC) Subject: Re: [RFC PATCH 3/3] mm,memory_hotplug: Allocate memmap from the added memory range To: Oscar Salvador Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, vbabka@suse.cz, pasha.tatashin@soleen.com References: <20201022125835.26396-1-osalvador@suse.de> <20201022125835.26396-4-osalvador@suse.de> <3cc37927-538e-ae7d-27bc-45aaabe06b3a@redhat.com> <20201119104847.GA5281@localhost.localdomain> From: David Hildenbrand Organization: Red Hat GmbH Message-ID: Date: Fri, 20 Nov 2020 10:31:05 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.6.0 MIME-Version: 1.0 In-Reply-To: <20201119104847.GA5281@localhost.localdomain> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 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: >>> - move_pfn_range_to_zone(zone, pfn, nr_pages, NULL, MIGRATE_ISOLATE); >>> + move_pfn_range_to_zone(zone, pfn, nr_pages, nr_vmemmap_pages, NULL, >>> + MIGRATE_ISOLATE); >> >> As mentioned, I'd suggest properly initializing the memmap here >> >> if (nr_vmemmap_pages) { >> move_pfn_range_to_zone(zone, pfn, nr_vmemmap_pages, NULL, >> MIGRATE_UNMOVABLE); >> } >> move_pfn_range_to_zone(zone, valid_start_pfn, valid_nr_pages, NULL, > > Sure, agreed. > >>> + if (!support_memmap_on_memory(size)) >>> + mhp_flags &= ~MEMHP_MEMMAP_ON_MEMORY; >> >> Callers (e.g., virtio-mem) might rely on this. We should reject this with >> -EINVAL and provide a way for callers to test whether this flag is possible. > > Uhm, we might want to make "support_memmap_on_memory" public, and > callers who might want to it use can check its return value? > Or do you have something else in mind? Right, a way for callers to check if it's supported. "mhp_supports_memmap_on_memory" or sth. like that. Thanks! -- Thanks, David / dhildenb