Is "-XX:G1OldCSetRegionLiveThresholdPercent" a flag in java 7?

[Ryan Gardner]

In the slides posted for the G1 tuning session at Java One 2012 here:

http://www.myexpospace.com/JavaOne2012/SessionFiles/CON6583_PDF_6583_0001.pdf

I see "-XX:G1OldCSetRegionLiveThresholdPercent" being listed as one of the
options to try to tune long mixed GC's

I tried using this on Java 1.7.0_21 but it comes back as being an
unrecognized vm option

Is there another secret flag I need to enable to try to tune these bits
more?
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