On 09/01/2009 12:44 PM, Avi Kivity wrote:
Instead of saving the debug registers from the processor to a kvm data structure, rely in the debug registers stored in the thread structure. This allows us not to save dr6 and dr7. Reduces lightweight vmexit cost by 350 cycles, or 11 percent.
Andrew, this is now available as the 'debugreg' branch of kvm.git. Given the massive performance improvement, it will be interesting to see how the test results change.
Marcelo, please queue this for 2.6.32, and I think it's even suitable for -stable.
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