From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: virtio-dev-return-2430-cohuck=redhat.com@lists.oasis-open.org Sender: List-Post: List-Help: List-Unsubscribe: List-Subscribe: Received: from lists.oasis-open.org (oasis-open.org [66.179.20.138]) by lists.oasis-open.org (Postfix) with ESMTP id 118AF5819382 for ; Mon, 31 Jul 2017 15:18:41 -0700 (PDT) Message-ID: <597F2439.5070309@intel.com> Date: Mon, 31 Jul 2017 20:36:09 +0800 From: Wei Wang MIME-Version: 1.0 References: <59686EEB.8080805@intel.com> <20170723044036-mutt-send-email-mst@kernel.org> <59781119.8010200@intel.com> <20170726155856-mutt-send-email-mst@kernel.org> <597954E3.2070801@intel.com> <20170729020231-mutt-send-email-mst@kernel.org> <597C83CC.7060702@intel.com> <20170730043922-mutt-send-email-mst@kernel.org> <286AC319A985734F985F78AFA26841F739288D85@shsmsx102.ccr.corp.intel.com> <20170730191735-mutt-send-email-mst@kernel.org> <20170730191911-mutt-send-email-mst@kernel.org> In-Reply-To: <20170730191911-mutt-send-email-mst@kernel.org> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Subject: [virtio-dev] Re: [PATCH v12 5/8] virtio-balloon: VIRTIO_BALLOON_F_SG To: "Michael S. Tsirkin" Cc: "linux-kernel@vger.kernel.org" , "qemu-devel@nongnu.org" , "virtualization@lists.linux-foundation.org" , "kvm@vger.kernel.org" , "linux-mm@kvack.org" , "david@redhat.com" , "cornelia.huck@de.ibm.com" , "akpm@linux-foundation.org" , "mgorman@techsingularity.net" , "aarcange@redhat.com" , "amit.shah@redhat.com" , "pbonzini@redhat.com" , "liliang.opensource@gmail.com" , "virtio-dev@lists.oasis-open.org" , "yang.zhang.wz@gmail.com" , "quan.xu@aliyun.com" List-ID: On 07/31/2017 12:20 AM, Michael S. Tsirkin wrote: > On Sun, Jul 30, 2017 at 07:18:33PM +0300, Michael S. Tsirkin wrote: >> On Sun, Jul 30, 2017 at 05:59:17AM +0000, Wang, Wei W wrote: >> That's a hypervisor implementation detail. From guest point of view, >> discarding contents can not be distinguished from writing old contents. >> > Besides, ignoring the free page tricks, consider regular ballooning. > We map page with DONTNEED then back with WILLNEED. Result is > getting a zero page. So at least one of deflate/inflate should be input. > I'd say both for symmetry. > OK, I see the point. Thanks. Best, Wei --------------------------------------------------------------------- To unsubscribe, e-mail: virtio-dev-unsubscribe@lists.oasis-open.org For additional commands, e-mail: virtio-dev-help@lists.oasis-open.org