RFR 8204947: Port ShenandoahTaskTerminator to mainline and make it default

[Roman Kennke]

Am 30.11.18 um 15:12 schrieb Zhengyu Gu:
> Hi Kim and Roman,
> 
> On 11/29/18 5:22 PM, Roman Kennke wrote:
>> 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).
> 
> I wish I saw this before filing CSR, and somehow, I also missed David
> Holmes' comment
> (http://mail.openjdk.java.net/pipermail/jdk8u-dev/2018-November/008214.html),
> Sigh!
> 
> 
>>
>> 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.
> 
> Thanks for the suggestion, I changed the flag to diagnostic. Please see
> updated webrev: http://cr.openjdk.java.net/~zgu/JDK-8204947/webrev.03/
> 
> I also wanted to update CSR
> (https://bugs.openjdk.java.net/browse/JDK-8214458) to reflect this
> change, but I could not add comments, that made me wonder if I can
> update text when it is in "provisional" status? or do I need to move
> back to "draft" to do so?


You need to use the comment button at the top! Not the one at the
bottom. Because the bottom one doesn't work. :-)

Roman

> Anyway, could you please review CSR also?
> 
> FYI:
>  Webrev02 passed vmTestbase_vm_gc and submit tests.
> 
> Thanks,
> 
> -Zhengyu
> 
> 
> 
> 
> 
>>
>> Roman
>>
>>

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