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    SubjectRE: [PATCH v36 0/5] Virtio-balloon: support free page reporting
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    On Friday, July 20, 2018 8:52 PM, Michael S. Tsirkin wrote:
    > On Fri, Jul 20, 2018 at 04:33:00PM +0800, Wei Wang wrote:
    > > This patch series is separated from the previous "Virtio-balloon
    > > Enhancement" series. The new feature,
    > VIRTIO_BALLOON_F_FREE_PAGE_HINT,
    > > implemented by this series enables the virtio-balloon driver to report
    > > hints of guest free pages to the host. It can be used to accelerate
    > > live migration of VMs. Here is an introduction of this usage:
    > >
    > > Live migration needs to transfer the VM's memory from the source
    > > machine to the destination round by round. For the 1st round, all the
    > > VM's memory is transferred. From the 2nd round, only the pieces of
    > > memory that were written by the guest (after the 1st round) are
    > > transferred. One method that is popularly used by the hypervisor to
    > > track which part of memory is written is to write-protect all the guest
    > memory.
    > >
    > > This feature enables the optimization by skipping the transfer of
    > > guest free pages during VM live migration. It is not concerned that
    > > the memory pages are used after they are given to the hypervisor as a
    > > hint of the free pages, because they will be tracked by the hypervisor
    > > and transferred in the subsequent round if they are used and written.
    > >
    > > * Tests
    > > - Test Environment
    > > Host: Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz
    > > Guest: 8G RAM, 4 vCPU
    > > Migration setup: migrate_set_speed 100G, migrate_set_downtime 2
    > > second
    >
    > Can we split out patches 1 and 2? They seem appropriate for this release ...

    Sounds good to me. I'm not sure if there would be comments on the first 2 patches. If no, can you just take them here? Or you need me to repost them separately?

    Best,
    Wei

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