PRT memory usage

[Milan Mimica]

Hello

I'm (still) trying to figure our high memory usage by PRT. I have studied
heapRegionRemSet.cpp code and came up with a calculation I need you to
confirm. Given region size of 8M and default G1 settings:
* max number of PRT instances is 2^12 for each HR
* PRT size is 64MB

I'm looking at the worst-case scenario and I don't dare to multiply the
tree numbers. The cap is just to high. Am I missing something?
Do only Young HR get a OtherRegionsTable?
Where can I find the number of regions per generation? I cannot spot it in
GC logs.
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