Adaptive GC policy and other improvements. #3589
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…en and survivors.
…ile its referent is not.
…fix initial eden size.
…n incremental GC.
…generation; use young generation size for basic policies, too.
…ing incorrectness.
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At the core of this PR is a (partial) port of HotSpot's ParallelGC
PSAdaptiveSizePolicy, which tries to meet a throughput goal while maintaining a low footprint by adjusting the space sizes and the tenuring threshold based on statistical information that it keeps.The other changes in this PR are improvements and fixes to make our serial GC behave more like ParallelGC (without the parallel part). Most prominently, this means using survivor spaces during full GCs and for pinned objects and tenuring survivor objects during a collection once the young generation is full. The old GC policies and their behavior are retained.
In its current state, peak throughput can be significantly higher than with the previous GC policy, but typically at the price of a higher peak resident set size, as benchmarked with microservice workloads.