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SubjectRe: [PATCH v37 0/3] Virtio-balloon: support free page reporting
On 10/25/2018 08:58 AM, Michael S. Tsirkin wrote:
> On Mon, Aug 27, 2018 at 09:32:16AM +0800, Wei Wang wrote:
>> 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 host. It can be used to accelerate virtual machine (VM) live
>> migration. 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 have the hypervisor 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.
> OK so it will be in linux-next. Now can I trouble you for a virtio spec
> patch with the description please?

No problem, I'll start to patch the spec. Thanks!


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