G1 flag

[Joy Xiong]

Hi, 
I am trying JDK1.8 with G1. However, the java process does not start if I specify -XX:+UnlockDiagnosticVMOptions -XX:G1MixedGCLiveThresholdPercent=xx.
Does the version support the flag -XX:G1MixedGCLiveThresholdPercent=xx?
thanks,-Joy
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