RFR: 8244505: G1 pause time ratio calculation does not consider Remark/Cleanup pauses [v5]

[Thomas Schatzl]

On Fri, 18 Sep 2020 06:59:37 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

>> The computation for long and short term pause time ratios does not include Remark/Cleanup pause times. Isolate updates
>> to _prev_collection_pause_end_ms from update_recent_gc_times(), then have all gc pauses (including Remark/Cleanup)
>> recorded by update_recent_gc_times(). Patch also includes trivial clean ups to g1Policy.* files. Testing: Tier 1 - 7
>> Performance testing did not show any significant changes in performance
>
> Ivan Walulya has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Instruction reordering the eliminate bug introduced by refactoring

Marked as reviewed by tschatzl (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/183