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US 10,503,659 B2Granted
Post-copy VM migration speedup using free page hinting
AssigneeRed Hat Israel, Ltd.
InventorsMichael Tsirkin, David A. Gilbert
Life of this patent
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AssigneeRed Hat Israel, Ltd.
InventorsMichael Tsirkin, David A. Gilbert
Estimating the term…
A system and methods for migrating a virtual machine (VM). In one embodiment, a hypervisor receives a request to migrate the contents of a memory of a source VM in a first physical memory area to a destination VM in a second physical memory area, where the first and second physical memory areas are disjoint. The hypervisor executes the destination VM in response to the request, and detects an access of a page of memory of the destination VM. The hypervisor determines, in view of a data structure maintained by a guest operating system executing in the destination VM, that a first page of a memory of the source VM in the first physical memory area is currently in use by the destination VM. In response to the detecting, the hypervisor: copies, in view of the first page of VM memory being used by the destination VM, the contents of the first page to a corresponding page of the destination VM; and maps, in view of a second page of VM memory not being used by the destination VM, (i) a physical memory page that is external to the first physical memory area and to the second physical memory area to (ii) a page of the destination VM corresponding to the second page.
A method comprising:
An apparatus comprising:
A non-transitory computer-readable medium comprising instructions that, when executed by a processing device of a physical machine, cause the processing device to execute a hypervisor to:
Dependencies are inferred from the claim text.