RFR: JDK-8076267 - Remove n_gens()

[Joseph Provino]

Looks good to me.

joe

On 3/31/2015 9:14 AM, Jesper Wilhelmsson wrote:
> Hi,
>
> Please review this next cleanup in the backwaters of the generation 
> array removal. This change removes the n_gens() method and the 
> max_gens variable from GenCollectedHeap.
>
> Next in line in the cleanup queue is a change to remove the levels 
> concept. Mostly all places where we today pass a "level" in the GC 
> code can be removed, or be made more explicit by introducing two 
> constants, YOUNG and OLD. Removing n_gens() and the levels touches 
> upon the same code in many places and we could skip one, in some 
> places somewhat ugly, intermediate version by doing both changes at 
> the same time. The levels removal is a much larger and trickier change 
> though, so to make it easier to review I choose to split these into 
> two changes. Please keep this in mind when reviewing the current change.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8076267
> Webrev: http://cr.openjdk.java.net/~jwilhelm/8076267/webrev.00/
>
> Thanks,
> /Jesper