RFR(S) 8206467: Refactor G1ParallelCleaningTask into shared

[Zhengyu Gu]

Ping!

Thanks,

-Zhengyu

On 07/06/2018 12:56 PM, Zhengyu Gu wrote:
> Hi,
> 
> Shenandoah has a similar version that was derived from 
> G1ParallelCleaningTask, with additional time tracking of each cleaning 
> task.
> 
> Due to code movement and renaming, the changeset appears to be large, 
> but it is really not. Other than the renaming, followings are the actual 
> diffs vs. current G1ParallelCleaningTask:
> 
> - G1StringDedupUnlinkOrOopsDoClosure is passed as a parameter.
> 
> - Counters (_string_processed, _string_removed, and etc.) in 
> StringAndSymbolCleaningTask are volatile now, cause they are updated 
> using atomic operations.
> 
> - Added ParallelCleaningTimes and ParallelCleaningTaskTimer classes for 
> tracking times.
> 
> - ParallelCleaningTask::work() added time tracking code.
> 
> 
> Bug: https://bugs.openjdk.java.net/browse/JDK-8206467
> Webrev: http://cr.openjdk.java.net/~zgu/8206467/webrev.00/
> 
> 
> Test:
>    hotspot_gc on Linux 64 (fastdebug and release)
> 
> 
> Thanks,
> 
> -Zhengyu
> 
> 
>