From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zhao Yan <yan.y.zhao@intel.com>
Subject: Re: [PATCH 0/5] QEMU VFIO live migration
Date: Wed, 20 Feb 2019 21:04:58 -0500
Message-ID: <20190221020457.GL16456@joy-OptiPlex-7040>
References: <1550566254-3545-1-git-send-email-yan.y.zhao@intel.com>
	<33183CC9F5247A488A2544077AF19020DB25D374@dggeml511-mbx.china.huawei.com>
	<20190221002444.GH16456@joy-OptiPlex-7040>
	<33183CC9F5247A488A2544077AF19020DB25E1F3@dggeml511-mbx.china.huawei.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Cc: "cjia@nvidia.com" <cjia@nvidia.com>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	"aik@ozlabs.ru" <aik@ozlabs.ru>,
	"Zhengxiao.zx@Alibaba-inc.com" <Zhengxiao.zx@Alibaba-inc.com>,
	"shuangtai.tst@alibaba-inc.com" <shuangtai.tst@alibaba-inc.com>,
	"qemu-devel@nongnu.org" <qemu-devel@nongnu.org>,
	"kwankhede@nvidia.com" <kwankhede@nvidia.com>,
	"eauger@redhat.com" <eauger@redhat.com>,
	"yi.l.liu@intel.com" <yi.l.liu@intel.com>,
	"eskultet@redhat.com" <eskultet@redhat.com>,
	"ziye.yang@intel.com" <ziye.yang@intel.com>,
	"mlevitsk@redhat.com" <mlevitsk@redhat.com>,
	"pasic@linux.ibm.com" <pasic@linux.ibm.com>,
	"felipe@nutanix.com" <felipe@nutanix.com>,
	"Ken.Xue@amd.com" <Ken.Xue@amd.com>,
	"kevin.tian@intel.com" <kevin.tian@intel.com>,
	"dgilbert@redhat.com" <dgilbert@redhat.com>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"intel-gvt-dev@lists.freedesktop.org"
	<inte
To: "Gonglei (Arei)" <arei.gonglei@huawei.com>
Return-path: <qemu-devel-bounces+gceq-qemu-devel2=m.gmane.org@nongnu.org>
Content-Disposition: inline
In-Reply-To: <33183CC9F5247A488A2544077AF19020DB25E1F3@dggeml511-mbx.china.huawei.com>
List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>
List-Archive: <http://lists.nongnu.org/archive/html/qemu-devel/>
List-Post: <mailto:qemu-devel@nongnu.org>
List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help>
List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>,
	<mailto:qemu-devel-request@nongnu.org?subject=subscribe>
Errors-To: qemu-devel-bounces+gceq-qemu-devel2=m.gmane.org@nongnu.org
Sender: "Qemu-devel"
	<qemu-devel-bounces+gceq-qemu-devel2=m.gmane.org@nongnu.org>
List-Id: kvm.vger.kernel.org

> > 
> > > 5) About log sync, why not register log_global_start/stop in
> > vfio_memory_listener?
> > >
> > >
> > seems log_global_start/stop cannot be iterately called in pre-copy phase?
> > for dirty pages in system memory, it's better to transfer dirty data
> > iteratively to reduce down time, right?
> > 
> 
> We just need invoking only once for start and stop logging. Why we need to call
> them literately? See memory_listener of vhost.
>
the dirty pages in system memory produces by device is incremental.
if it can be got iteratively, the dirty pages in stop-and-copy phase can be
minimal. 
:)

> Regards,
> -Gonglei