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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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      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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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8079947 C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8082871 C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8086499 C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8137553 C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8068934 C2: uncommon trap w/ Reason_speculate_class_check causes performance regression due to continuous deoptimizations

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8063137 Never taken branches should be pruned when GWT LambdaForms are shared

            • P1 - Blocks development and/or testing work, production could not run.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8218163 C2: Continuous deoptimization w/ Reason_speculate_class_check and Action_none

            • P3 - Major loss of function.
            • Resolved

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                vlivanov Vladimir Ivanov
                vlivanov Vladimir Ivanov
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