CRR (XXS): 7146246: G1: expose some of the -XX flags that drive which old regions to collect during mixed GCs

[John Cuthbertson]

Hi Tony,

Looks good to me. I like the new names.

JohnC

On 03/21/12 08:13, Tony Printezis wrote:
> Hi all,
>
> Can I have a couple of quick code review for this very small change?
>
> http://cr.openjdk.java.net/~tonyp/7146246/webrev.0/
>
> It turns the following two cmd line params into product params:
>
> G1HeapWastePercent (previously called: G1OldReclaimableThresholdPercent)
> G1MixedGCCountTarget (previous called: G1MaxMixedGCNum)
>
> These are helpful in allowing the user to fine-tune G1's behavior wrt 
> which old regions to collect during mixed GCs, how many mixed GCs to 
> do, etc.
>
> I also increased the default value of the former from 1% to 5%. 
> Charlie ran some performance tests and found that the new default 
> eliminated some very long mixed GCs that he was experiencing with the 
> old default.
>
> Tony
>