8138969: G1CollectorPolicy should use const for applicable methods

[Mikael Gerdin]

Hi Erik,

On 2015-10-06 17:06, Erik Helin wrote:
> Hi all,
>
> this patch adds the keyword const to a lot of methods in
> G1CollectorPolicy. This makes it easier to reason about these methods
> since they no longer can cause mischief by updating fields in
> unpredicted ways.
>
> Enhancement:
> https://bugs.openjdk.java.net/browse/JDK-8138969
>
> Webrev:
> http://cr.openjdk.java.net/~ehelin/8138969/webrev.00/

This is really nice to have!
I like the const overload of the collector state object as well, so that 
if we are in a const method we cannot mutate the collector state.

Could you look into doing a similar const overload of the mmu_tracker 
acessor?

/Mikael

>
> Testing:
> JPRT
>
> Thanks,
> Erik
>