RFR: 8276887: G1: Move precleaning to Concurrent Mark From Roots subphase

Wed Nov 10 12:35:37 UTC 2021

On Wed, 10 Nov 2021 09:28:15 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of moving the "Preclean" subphase into "Mark from roots" subphase so that precleaning becomes parallel automatically. Evaluation using a contrived java program shows that multiple GC threads do precleaning. More detailed testing results are available in the JBS ticket.
> 
> Test: hotspot_gc

Lgtm.

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Marked as reviewed by tschatzl (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/6327