Adjusting transfer rate of virtual machine state in virtual machine migration

1. A method, comprising:

determining, by a processor, a first rate being a rate of change of an execution state of a virtual machine undergoing live migration from an origin host computer system to a destination host computer system;

determining a second rate being a rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system;

detecting an increase in the first rate;

determining that a ratio of the first rate to the second rate exceeds a threshold convergence ratio; and

reducing the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system.

2. The method of claim 1 , wherein the threshold convergence ratio is less than or equal to 1.

3. The method of claim 1 , further comprising:

determining that a ratio of the first rate to the second rate is less than or equal to a second threshold ratio; and

increasing the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system.

4. The method of claim 3 , wherein the second threshold ratio is equal to the threshold convergence ratio.

5. The method of claim 1 , wherein reducing the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system comprises suspending the transfer of the virtual machine execution state from the origin host computer system to the destination host computer system.

6. The method of claim 5 , further comprising:

determining that a ratio of the first rate to the second rate is less than a second threshold ratio; and

resuming the transfer of the virtual machine execution state from the origin host computer system to the destination host computer system.

7. The method of claim 6 , wherein the second threshold ratio is equal to the threshold convergence ratio.

8. The method of claim 1 , wherein the execution state of the virtual machine comprises at least one of: a memory state, a virtual processor state, a virtual device state, or a connectivity state.

9. The method of claim 1 , wherein the second rate is represented by at least a fraction of a maximum network transmission rate.

10. The method of claim 1 , wherein the second rate is represented by at least a fraction of an observed network transmission rate.

11. A system comprising:

a memory; and

a processor, operatively coupled to the memory, to:

determine a first rate being a rate of change of an execution state of a virtual machine undergoing live migration from an origin host computer system to a destination host computer system;

determine a second rate being a rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system;

detect an increase in the first rate;

determine that a ratio of the first rate to the second rate exceeds a threshold convergence ratio; and

reduce the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system.

12. The system of claim 11 , wherein the threshold convergence ratio is less than or equal to 1.

13. The system of claim 11 , wherein the processor is further to:

determine that a ratio of the first rate to the second rate is less than or equal to a second threshold ratio; and

increase the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system.

14. The system of claim 13 , wherein the second threshold ratio is equal to the threshold convergence ratio.

15. The system of claim 11 , wherein to reduce the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system, the processor is to suspend the transfer of the virtual machine execution state from the origin host computer system to the destination host computer system.

16. The system of claim 15 , wherein the processor is further to:

determine that a ratio of the first rate to the second rate is less than a second threshold ratio; and

resume the transfer of the virtual machine execution state from the origin host computer system to the destination host computer system.

17. The system of claim 16 , wherein the second threshold ratio is equal to the threshold convergence ratio.

18. The system of claim 11 , wherein the execution state of the virtual machine comprises at least one of: a memory state, a virtual processor state, a virtual device state, or a connectivity state.

19. The system of claim 11 , wherein the second rate is represented by at least a fraction of an observed network transmission rate.

20. A non-transitory computer-readable storage medium comprising executable instructions to cause a processor to:

determine, by the processor, a first rate being a rate of change of an execution state of a virtual machine undergoing live migration from an origin host computer system to a destination host computer system;

determine a second rate being a rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system;

detect an increase in the first rate;

determine that a ratio of the first rate to the second rate exceeds a threshold convergence ratio; and

reduce the rate of transferring the execution state of the virtual machine from the origin host computer system to the destination host computer system.