RFR 8204947: Port ShenandoahTaskTerminator to mainline and make it default

[Roman Kennke]

Hi Kim,

>>
>> I believe if you add a flag, you need to file a CSR.
> 
> Experimental and diagnositc options don't need a CSR.  From the CSR FAQ: 
> https://wiki.openjdk.java.net/display/csr/CSR+FAQs
> 
> "Interfaces that are experimental or for diagnostic purposes do not
> need to go through CSR process, but the CSR process may be employed if
> feedback from the CSR reviewers is desired."
> 
> That's a relatively recent change (this calendar year).

Interesting! Does that mean that, strictly speaking, we don't need a CSR
for Shenandoah flags? :-)

(In any event, it would be nice if you or somebody else from hotspot-gc
could review it:
https://bugs.openjdk.java.net/browse/JDK-8214349 )

> I also think what's being proposed here is more of a diagnostic than
> experimental flag.  I think an experimental flag ought to be opt-in,
> e.g. off by default but one can choose to take the risk.  A diagnostic
> flag can be used to opt-out of the "normal" behavior, in this case to
> revert back to the old behavior.  Of course, we violate that a lot...

I agree. Diagnostic seems to fit the purpose better.

Roman


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