JDK-8136678 : Implement adaptive sizing algorithm for IHOP
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P2
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2015-09-17
  • Updated: 2017-05-19
  • Resolved: 2015-11-25
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9 b96Fixed
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Add support for adaptive IHOP, recalculating that value every GC based on current heap size, allocation reserves, promotion rate and other metrics.

Support should be gated behind a new switch called -XX:+G1UseAdaptiveIHOP. Basic tracing should be provided using -XX:+PrintAdaptiveSizePolicy.
The changes should encapsulate the logic in a single G1IHOPControl (or similar class) that can be unit tested, plus unit tests.