RFR: 8312117: GenShen: Preempt OLD marking more quickly when YOUNG triggers arise [v2]

[Y. Srinivas Ramakrishna]

On Mon, 2 Oct 2023 18:05:03 GMT, William Kemper <wkemper at openjdk.org> wrote:

>> Have regulator thread wait until expected condition is met
>
> William Kemper has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - Use same precision for time checks as log messages
>  - Regulator lock should protect the write to mode

src/hotspot/share/gc/shenandoah/shenandoahControlThread.cpp line 912:

> 910:     MonitorLocker ml(&_regulator_lock, Mutex::_no_safepoint_check_flag);
> 911:     while (_mode == none) {
> 912:       bool timeout = ml.wait(5);

Should this be a globals value? Are there other such "took too long to respond" loops governed by a timeout variable defined in shenandoah_globals.hpp that might be open to overloaded use here perhaps?

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PR Review Comment: https://git.openjdk.org/shenandoah/pull/333#discussion_r1343056111