Request for review(XS): 6819098 G1: reduce RSet scanning times

Igor Veresov Igor.Veresov at Sun.COM
Fri Apr 24 00:17:01 UTC 2009

Modified previous naive work stealing algorithm by introducing a minimal 
work unit for the helper threads participating in the RSet scan (thus 
avoiding competition for each card), also added bounded exponential 

Testing: JBB2005 on a 16-core intel core2 box with 30G heap (25G young 
gen), 13 GC threads. The RSet scanning times reduced ~600%.


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