JDK-8218163 : C2: Continuous deoptimization w/ Reason_speculate_class_check and Action_none
  • Type: Bug
  • Component: hotspot
  • Sub-Component: compiler
  • Affected Version: 11,12,13
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2019-01-31
  • Updated: 2019-10-04
  • Resolved: 2019-02-02
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JDK 11 JDK 13
11.0.5Fixed 13 b07Fixed
Related Reports
Relates :  
JDK-8068915 - C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations
Description
Continuous deoptimization w/ Reason_speculate_class_check and Action_none when recompilation count is too high.

Affects EarleyBoyer benchmark (Octane/Nashorn) and manifests as bimodal distribution of scores.
Comments
Fix Request (11u) This alleviates bad compilation conditions when devirtualized callsite is constantly changing. The patch would fallback to virtual call in those conditions. The patch applies cleanly to 11u, passes tier1, tier2 tests. Ran earley-boyer benchmark from octane.js (not the same Vladimir has), the performance is on par with the baseline.
25-06-2019