REDUCING REDUNDANT NETWORK TRANSMISSIONS IN VIRTUAL MACHINE LIVE MIGRATION
First Claim
1. A method, comprising:
- reading, by a hypervisor running on a first computer system, from a memory mapped into an address space of a virtual machine undergoing live migration from the first computer system to a second computer system, a data structure comprising a plurality of records, each record mapping an address of a memory page to an identifier of a virtual disk frame storing contents of the memory page;
reading, from the memory mapped into the address space of the virtual machine, a plurality of page modification flags, each page modification flag indicating that contents of a corresponding memory page differ from contents of a virtual disk frame referenced by the data structure;
responsive to determining that a memory page is referenced by the data structure and that a page modification flag corresponding to the memory page is set, transmitting the memory page to the second computer system; and
responsive to determining that a memory page is not referenced by the data structure, transmitting the memory page to the second computer system.
1 Assignment
0 Petitions
Accused Products
Abstract
Systems and methods for reducing redundant network transmissions in virtual machine live migration. An example method may comprise: reading, by a hypervisor running on a first computer system, from a memory mapped into an address space of a virtual machine undergoing live migration from the first computer system to a second computer system, a data structure comprising a plurality of records, each record mapping an address of a memory page to an identifier of a virtual disk frame storing contents of the memory page; reading a plurality of page modification flags, each page modification flag indicating that contents of a corresponding memory page differ from contents of a virtual disk frame referenced by the data structure; responsive to determining that a memory page is referenced by the data structure and that a page modification flag corresponding to the memory page is set, transmitting the memory page to the second computer system; and responsive to determining that a memory page is not referenced by the data structure, transmitting the memory page to the second computer system.
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Citations
20 Claims
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1. A method, comprising:
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reading, by a hypervisor running on a first computer system, from a memory mapped into an address space of a virtual machine undergoing live migration from the first computer system to a second computer system, a data structure comprising a plurality of records, each record mapping an address of a memory page to an identifier of a virtual disk frame storing contents of the memory page; reading, from the memory mapped into the address space of the virtual machine, a plurality of page modification flags, each page modification flag indicating that contents of a corresponding memory page differ from contents of a virtual disk frame referenced by the data structure; responsive to determining that a memory page is referenced by the data structure and that a page modification flag corresponding to the memory page is set, transmitting the memory page to the second computer system; and responsive to determining that a memory page is not referenced by the data structure, transmitting the memory page to the second computer system. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system of a first computer system, comprising:
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a memory; and one or more processors, coupled to the memory, to; read, by a hypervisor running on the first computer system, from a memory mapped into an address space of a virtual machine undergoing live migration from the first computer system to a second computer system, a data structure comprising a plurality of records, each record mapping an address of a memory page to an identifier of a virtual disk frame storing contents of the memory page; read, from the memory mapped into the address space of the virtual machine, a plurality of page modification flags, each page modification flag indicating that contents of a corresponding memory page differ from contents of a virtual disk frame referenced by the data structure; responsive to determining that a memory page is referenced by the data structure and that a page modification flag corresponding to the memory page is set, transmit the memory page to the second computer system; and responsive to determining that a memory page is not referenced by the data structure, transmit the memory page to the second computer system. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A computer-readable non-transitory storage medium comprising executable instructions that, when executed by a first computer system, cause the first computer system to:
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read, by a hypervisor running on the first computer system, from a memory mapped into an address space of a virtual machine undergoing live migration from the first computer system to a second computer system, a data structure comprising a plurality of records, each record mapping an address of a memory page to an identifier of a virtual disk frame storing contents of the memory page; read, from the memory mapped into the address space of the virtual machine, a plurality of page modification flags, each page modification flag indicating that contents of a corresponding memory page differ from contents of a virtual disk frame referenced by the data structure; responsive to determining that a memory page is referenced by the data structure and that a page modification flag corresponding to the memory page is set, transmit the memory page to the second computer system; and responsive to determining that a memory page is not referenced by the data structure, transmit the memory page to the second computer system. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification