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[195.135.220.15]) by mx.google.com with ESMTPS id g23si2977425eje.165.2019.03.28.07.16.33 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Mar 2019 07:16:33 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id C140EB780; Thu, 28 Mar 2019 14:16:32 +0000 (UTC) Date: Thu, 28 Mar 2019 15:16:31 +0100 From: Michal Hocko To: David Hildenbrand Cc: Dan Williams , Andrew Morton , =?iso-8859-1?B?Suly9G1l?= Glisse , Logan Gunthorpe , Toshi Kani , Jeff Moyer , Vlastimil Babka , stable , Linux MM , linux-nvdimm , Linux Kernel Mailing List Subject: Re: [PATCH v5 00/10] mm: Sub-section memory hotplug support Message-ID: <20190328141631.GB7155@dhcp22.suse.cz> References: <155327387405.225273.9325594075351253804.stgit@dwillia2-desk3.amr.corp.intel.com> <20190322180532.GM32418@dhcp22.suse.cz> <20190325101945.GD9924@dhcp22.suse.cz> <20190326080408.GC28406@dhcp22.suse.cz> <20190327161306.GM11927@dhcp22.suse.cz> <9e769f3d-00f2-a8bb-2d8d-097735cb2a6d@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <9e769f3d-00f2-a8bb-2d8d-097735cb2a6d@redhat.com> User-Agent: Mutt/1.10.1 (2018-07-13) 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: On Thu 28-03-19 14:38:15, David Hildenbrand wrote: > On 27.03.19 17:13, Michal Hocko wrote: [...] > > People are asking for a smaller memory hotplug granularity for other > > usecases (e.g. memory ballooning into VMs) which are quite dubious to > > be honest and not really worth all the code rework. If we are talking > > about something that can be worked around elsewhere then it is preferred > > because the code base is not in an excellent shape and putting more on > > top is just going to cause more headaches. > > At least for virtio-mem, it will be handled similar to xen-balloon and > hyper-v balloon, where whole actions are added and some parts are kept > "soft-offline". But there, one device "owns" the complete section, it > does not overlap with other devices. One section only has one owner. This is exactly what I meant by handing at a higher level. -- Michal Hocko SUSE Labs