RFR: 8270009: Factor out and shuffle methods in G1CollectedHeap::do_collection_pause_at_safepoint_helper [v3]

[Thomas Schatzl]

On Mon, 12 Jul 2021 13:19:45 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

>> It is true that it is now also included in the time used for MMU calculation (as part of the `record_collection_start/end` pair), which may a problem.
>> 
>> Previous gc timing also included it though, i.e. in the `note_gc_start()/print_phase_times()` pair.
>> 
>> I'll move it back then.
>
> Things are unfortunately a bit messy and confusing/confused about pause time handling; see JDK-8240779 and JDK-7178365.

I am aware of those, but this change does not really intend to fix these issues, but hopefully not make them worse (afaict this has been achieved).

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PR: https://git.openjdk.java.net/jdk/pull/4744