JDK-8277736 : G1: Allow forced evacuation failure of first N regions in collection set
  • Type: Sub-task
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 18
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2021-11-24
  • Updated: 2021-11-30
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8277851 - G1: Allow random selection of forced evacuation failure of N regions in collection set
Relates :  
JDK-8256265 - G1: Improve parallelism in regions that failed evacuation
Relates :  
JDK-8276094 - Region Pinning in G1
Description
Currently, debug options of evacuation failure, like G1EvacuationFailureALotInterval and G1EvacuationFailureALotCount only config the ratio of objects failing evacuation, basically the distribution of objects failing evacuation is even among regions.

JDK-8256265 is trying to improve parallelism in regions that failed evacuation, it'll be helpful if there is option to config the distribution of objects failing evacuation among regions, so implementation of JDK-8256265 could be profiled more precisely.

This is to add the support and necessary vm options, and the implementation will be to select regions from start, i.e. not randomly, the motivation is to configure a more stable selection of evacuation failure regions, which will help verify the effect of JDK-8256265 implementation.