Code review request: 6604422: G1: re-use half-promoted regions (S)

[Tony Printezis]

Updated webrev, based on comments by Andrey and John Coomes:

http://cr.openjdk.java.net/~tonyp/6604422/webrev.1/

I'm also piggybacking on this a small fix for:

6728271 <http://monaco.sfbay.sun.com/detail.jsp?cr=6728271>: G1: Cleanup G1CollectedHeap::get_gc_alloc_regions()

(which basically consists of a couple of added asserts)

Tony

Tony Printezis wrote:
> Ensures that the last region allocated to during one GC is re-used, 
> when possible, during the next GC and it's not left half-full.
>
> http://cr.openjdk.java.net/~tonyp/6604422/webrev.0/
>
> Tony
>

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