Methods, apparatus, and articles of manufacture to virtualize performance counters

摘要

Methods, apparatus, and articles of manufacture to virtualize performance counters are disclosed. An example method includes scheduling a virtual machine on a processor, incrementing a virtual performance counter in response to an occurrence of a speculative event during direct execution of guest instructions by the virtual machine on the processor, and incrementing the virtual performance counter in response to an occurrence of the speculative event during execution of emulated instructions by a hypervisor on behalf of the virtual machine on the processor.

主权项

1. A method, comprising:
scheduling a virtual machine on a processor; incrementing a first virtual performance counter in response to an occurrence of a speculative event during direct execution of first guest instructions by the virtual machine on the processor; incrementing a second virtual performance counter in response to an occurrence of a non-speculative event during direct execution of the first guest instructions by the virtual machine on the processor; executing emulated instructions on behalf of the virtual machine on the processor using a hypervisor, the second virtual performance counter not being incremented in response to an occurrence of the non-speculative event during the execution of the emulated instructions; and incrementing the first virtual performance counter in response to an occurrence of the speculative event during the execution of the emulated instructions by the hypervisor.