RFR: JDK-8293114: GC should trim the native heap [v2]

[Zhengyu Gu]

On Sat, 3 Sep 2022 04:18:23 GMT, Thomas Stuefe <stuefe at openjdk.org> wrote:

> > Another question: does it have to create another thread? can it piggyback to e.g. `ServiceThread`?
> 
> It does so on Shenandoah, but the problem is the time trimming takes. As I wrote, it can take <1ms to up to almost a second. You then block the service thread for that time. So, even on Shenandoah I am not sure I shouldn't use a different thread.

Yea, you probably should not use `ShenandoahControlThread`, it may delay GC from happening.

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PR: https://git.openjdk.org/jdk/pull/10085