JDK-8035406 : Improve data structure for Code Cache remembered sets
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u20,9
  • Priority: P4
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-02-20
  • Updated: 2014-07-29
  • Resolved: 2014-03-17
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JDK 8 JDK 9
8u20Fixed 9 b08Fixed
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Description
In JDK-7145569 per region remembered sets for code cache roots were introduced.

The data structure for this was a simple GrowableArray. Measurements for JDK-8027295 have shown that reclaiming them is a serious performance bottleneck.

Also JDK-8025813 G1: Code root marking unbalanced requires a better data structure that is more amenable to parallelize.

The idea is to change the GrowableArray into a list of chunks containing the nmethod references.