Reducing or suspending transfer rate of virtual machine migration when dirtying rate exceeds a convergence threshold
An example method for adjusting the rate of transfer of the execution state of a virtual machine undergoing live migration may comprise determining, by a processor, a first rate being a rate of change of an execution state of a virtual machine undergoing live migration from a first computer system to a second computer system. The example method may further comprise determining a second rate being a rate of transfer of the execution state of the virtual machine to the second computer system. The example method may further comprise, responsive to determining that a ratio of the first rate to the second rate exceeds a first threshold ratio, suspending the transfer of the virtual machine execution state to the second computer system.
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 a first computer system to a second computer system;
determining a second rate being a rate of transfer of the execution state of the virtual machine to the second computer system; and
responsive to determining that a ratio of the first rate to the second rate exceeds a first threshold ratio, suspending the transfer of the virtual machine execution state to the second computer system, without suspending execution of the virtual machine.
2. The method of claim 1 , wherein the first threshold ratio is less than or equal to 1.
3. The method of claim 1 , further comprising:
responsive to determining that the ratio of the first rate to the second rate is less than a second threshold ratio, resuming the transfer of the virtual machine execution state to the second computer system.
4. The method of claim 3 , wherein the second threshold ratio is equal to the first threshold ratio.
5. 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.
6. The method of claim 1 , wherein the first rate is a size of memory pages that have been modified in a unit of time.
7. The method of claim 1 , wherein the second rate is represented by one of: at least a fraction of a maximum network transmission rate or at least a fraction of an observed network transmission rate.
8. The method of claim 1 , further comprising:
responsive to determining that the ratio of the first rate to the second rate has failed to fall below a second threshold ratio, performing a post-copy migration procedure.
9. 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 a first computer system to a second computer system;
determine a second rate being a rate of transfer of the execution state of the virtual machine to the second computer system; and
responsive to determining that a ratio of the first rate to the second rate exceeds a first threshold ratio, suspend the transfer of the virtual machine execution state to the second computer system, without suspending execution of the virtual machine.
10. The system of claim 9 , wherein the first threshold ratio is less than or equal to 1.
11. The system of claim 9 , wherein the processor is further to:
responsive to determining that the ratio of the first rate to the second rate is less than a second threshold ratio, resume the transfer of the virtual machine execution state to the second computer system.
12. The system of claim 11 , wherein the second threshold ratio is equal to the first threshold ratio.
13. The system of claim 9 , 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.
14. The system of claim 9 , wherein the first rate is a size of memory pages that have been modified in a unit of time.
15. The system of claim 9 , wherein the second rate is represented by one of: at least a fraction of a maximum network transmission rate or at least a fraction of an observed network transmission rate.
16. A computer-readable non-transitory 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 a first computer system to a second computer system;
determine a second rate being a rate of transfer of the execution state of the virtual machine to the second computer system; and
responsive to determining that a ratio of the first rate to the second rate exceeds a first threshold ratio, suspend the transfer of the virtual machine execution state to the second computer system, without suspending execution of the virtual machine.
17. The computer-readable non-transitory storage medium of claim 16 , wherein the first threshold ratio is less than or equal to 1.
18. The computer-readable non-transitory storage medium of claim 16 , further comprising executable instructions to cause the processor to:
responsive to determining that the ratio of the first rate to the second rate is less than a second threshold ratio, resuming the transfer of the virtual machine execution state to the second computer system.
19. The computer-readable non-transitory storage medium of claim 18 , wherein the second threshold ratio is equal to the first threshold ratio.
20. The computer-readable non-transitory storage medium of claim 18 , 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.