RFR: 8255955: Shenandoah: Only STW GC should process concurrent roots at pauses

[Roman Kennke]

On Thu, 5 Nov 2020 18:18:09 GMT, Zhengyu Gu <zgu at openjdk.org> wrote:

> This is a followup of JDK-8255847.
> 
> In early versions of Shenandoah, it marked through weak roots when class unloading is disabled. This is no longer the case. 
> 
> After moving weak roots (except that JVMTI weak root) processing to concurrent phase for concurrent GC, only STW GCs (degenerated GC and full GC) need to process concurrent weak roots at pause.

Looks good to me, thank you!

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Marked as reviewed by rkennke (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/1081