RFR: JDK-8263495: Gather liveness info in the mark phase of G1 full gc

[Hamlin Li]

On Fri, 12 Mar 2021 12:41:49 GMT, Hamlin Li <mli at openjdk.org> wrote:

> Gather liveness info in the mark phase of G1 full gc.
> 
> Per-region liveness info in the mark phase of G1 full gc is for several purposes:
> 
> JDK-8262068 needs it to determine whether compaction of a region should be skipped
> JDK-8258431 for a JFR event that prints live set size estimate
> 
> so add this functionality.

@tschatzl Hi Thomas, the patch is ready, would you mind to review the patch when available? Thanks.

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PR: https://git.openjdk.java.net/jdk/pull/2966