SHORT Miss ratio for VPU data writes

EVENTSET
PMC0  VPU_DATA_WRITE
PMC1  VPU_DATA_WRITE_MISS

METRICS
Runtime (RDTSC) [s] time
VPU write miss ratio PMC1/PMC0

LONG
Formula:
VPU write miss ratio = PMC1/PMC0
--
This performance group determines the ratio between writes and writes that miss
the cache and are issued by the VPU.
