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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JDK 9
9 b96Fixed
Related Reports
Blocks :  
JDK-8136679 - JFR event for adaptive IHOP
Blocks :  
JDK-8136681 - Factor out IHOP calculation from G1CollectorPolicy
Blocks :  
JDK-8140597 - Forcing an initial mark causes G1 to abort mixed collections
CSR :  
JDK-8199262 - Implement adaptive sizing algorithm for IHOP
Duplicate :  
JDK-7097565 - G1: adaptive policy for transitioning from mixed collections to new marking cycle
Relates :  
JDK-8142484 - Let IHOP follow the current capacity, not the maximum capacity
Relates :  
JDK-8140777 - Make Adaptive IHOP logging information the same as JFR logging
Relates :  
JDK-8140689 - Skip last young-only gc if nothing to do in the mixed gc phase
Relates :  
JDK-8136677 - Adaptive sizing for IHOP in G1
Relates :  
JDK-8141402 - GC locker initiated GC ends mixed gc phase
Description
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.
Comments
The changes should encapsulate the logic in a single G1IHOPControl (or similar class) that can be unit tested, plus unit tests.
17-09-2015