Using OpenXR in response time studies

I’d like to use OpenXR in a visual response time study and was hoping to get some advice on the best way to get an accurate display time of a submitted frame. My current plan is to use the predictedDisplayTime returned by xrWaitFrame along with the XR_KHR_win32_convert_performance_counter_time extension to get a timestamp of the display time that can be correlated to a Windows QPC timestamp of user input. Is there a way to get a more accurate display time of a frame after it has been submitted other than relying on the predicted display time?

That sounds like the most accurate way that I know of. There are some vendor extensions that give some performance feedback but I don’t know of any that provide the actual display time(s) of the previous frame.

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