RFR: 8256416: ZGC: Lower ZMarkCompleteTimeout

[Per Liden]

On Thu, 19 Nov 2020 14:50:24 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> With JEP-376 integrated, the ZMarkCompleteTimeout now essentially dictates how long the max GC pause will be in ZGC. Since our pauses are now on the order of 50-100us I propose we lower the ZMarkCompleteTimeout to 200us (instead of 1ms).
>> 
>> Running the usual benchmarks, I can see no difference in number of mark continues, which suggests 200us is long enough to handle all common cases.
>
> Looks good.

Thanks for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/1263