RFR: 8256416: ZGC: Lower ZMarkCompleteTimeout

[Erik Österlund]

On Tue, 17 Nov 2020 15:57:23 GMT, Per Liden <pliden 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.

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Marked as reviewed by eosterlund (Reviewer).

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