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  1. JDK
  2. JDK-8068915

C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

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    • Subcomponent:
    • Resolved In Build:
      b52
    • Verification:
      Verified

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        Description

        Some of Nashorn subbenchmarks can suffer a lot when an uncommon trap w/ Reason_speculate_class_check sometimes settles with Action_none after too many traps occured. It causes continuous deoptimizations and performance regresses a lot (up to 50x).

        ILW = HLH = P2
        I = H: severe performance regression on Nashorn
        L = L: requires very specific race between nmethod deoptimizations and recompilation; Nashorn & other JSR292 users are affected
        W = H: none

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                Assignee:
                vlivanov Vladimir Ivanov
                Reporter:
                vlivanov Vladimir Ivanov
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