RFR (M) 8149013: Remove unused and dead code from G1CollectorPolicy

[Jesper Wilhelmsson]

Looks good!
/Jesper

Den 4/2/16 kl. 14:02, skrev Mikael Gerdin:
> Hi all,
>
> Here's a cleanup of dead and unused code from the G1 collector policy.
>
> Some unused member variables can be removed:
> _no_of_gc_threads (only getter/setter)
> _parallel_gc_threads (only used locally in constructor)
>
>
> I'd also suggest to remove functionality related to Trace{Young,Old}GenTime from
> G1. The statistics collected are usually too coarse (avg. pause times over a
> complete run) to be useful and they have not been kept in sync with the time
> tracking done through the phase times tracking object.
>
> Removing this functionality from G1 leads to removal of:
>
> _stop_world_start (only used by Trace*GenTime)
> record_concurrent_pause()
> print_tracing_info()
> record_stop_world_start()
> etc.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8149013
> Webrev: http://cr.openjdk.java.net/~mgerdin/8149013/webrev.0/
> Testing: Local build and local GCBacsher
>
> Thanks
> /Mikael