RFR (M) JDK-8151178: Move the collection set out of the G1 collector policy

[Thomas Schatzl]

Hi Mikael,

On Mon, 2016-03-07 at 10:46 +0100, Mikael Gerdin wrote:
> Hi all,
> 
> Here's a new version of the webrev based on feedback from Jesper and
> Tom.
> 
> http://cr.openjdk.java.net/~mgerdin/8151178/version2/
> 
> The incremental layout is similar to version1, with the addition of 
> webrev_4 which contains the review changes.
> 
> In this update I also took the liberty to change G1CollectionSet to 
> become a value member in G1CollectedHeap instead of a separately C
> -heap 
> allocated object. I see no value in it being allocated separately.

  some minor issues:

- maybe the include changes in g1CollectorState.hpp should be a
separate CR, but then again, it's very small.

- instead of G1CollectionSet::set_g1p() I would have chosen
 G1CollectionSet::set_policy() for a name.

- as a future cleanup suggestion, maybe the CollectionSetChooser could
be one of the first targets, and probably hidden from direct access by
the G1CollectorPolicy. Not sure.

- g1CollectorPolicy.cpp:977 - superfluous newline ;)

Feel free to implement any of these suggestions, no need for re-review.

Thanks,
  Thomas