RFR 8204947: Port ShenandoahTaskTerminator to mainline and make it default

[Zhengyu Gu]

Hi Thomas,

Thanks for testing and cleaning it up.

-Zhengyu

On 11/30/18 9:45 AM, Thomas Schatzl wrote:
> Hi,
> 
> On Thu, 2018-11-29 at 13:15 -0500, Zhengyu Gu wrote:
>> Hi Thomas,
>>
>>>> I did not port it to CMS, as it is deprecated.
>>>
>>> I submitted a job to push it through our testing infrastructure. I
>>> will also run it through our perf benchmarks checking for issues.
>>>
>>
>> Thanks!
>>
> 
> Passed hs-tier1-7, jdk-tier1-3. I started another run with latest
> changes as CMS support (sans diagnostic flag change) has been added.
> 
>>
>>> As for CMS support, I would prefer to provide it - I need to see
>>> the reasoning in the CR - while CMS is deprecated, we may not be
>>> able to remove it in 13, while I would like to remove this flag
>>> independently and earlier :)
>>>
>>> With no CMS support for this task terminator we tie flag removal to
>>> CMS removal probably needlessly.
>>
>> Okay, ported to CMS.
>>
>> Webrev:
>> http://cr.openjdk.java.net/~zgu/JDK-8204947/webrev.02/index.html
>>
>> and passed hotspot_gc on Linux 64. I will run more tests.
> 
> I think the change is good from a functionality POV, however I think we
> can reduce the added boilerplate code (TaskTerminator with assignment
> operators, etc.) a bit. Give me a few hours to try out something.
> 
> In the meantime I collected typos and formatting issues in
> http://cr.openjdk.java.net/~tschatzl/8204947/webrev/ . Nothing
> interesting to see there, but fixing up typos that I do not think are
> worth listing one by one here again.
> 
> (It also changes the flag from experimental to diagnostic, but you
> already did that).
> 
> Thanks,
>    Thomas
> 
>