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  1. JDK
  2. JDK-6463133

Deoptimization should not use code patching

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    • Enhancement
    • Resolution: Fixed
    • P4
    • hs10
    • 6
    • hotspot
    • None
    • b06
    • generic
    • generic

    Backports

      Description

        Deoptimization is susceptible to failure because it uses cross code patching. At the moment we know of no cpu's where this fails but we may well be running out of time. Newer Intel processors have an errata which isn't planned to be fixed that hints that we could fail.

        We should use a deopt scheme that uses return address patching instead. This also allows us to go to single frame deopt. a capability we lost when lazy deopt was implemented.

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            backported by

            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-2171816 Deoptimization should not use code patching

            • P3 - Major loss of function.
            • 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-2176812 Deoptimization should not use code patching

            • P3 - Major loss of function.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-6511756 forte_is_valid_method() should call CollectedHeap::is_in_reserved() rather than is_in()

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-6670173 SA: jstack fails due to null sp on x86

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-6507028 _suspend_flags are not atomically updated in all cases

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-6669441 Performance regression running javac in 6u4 using -server

            • P3 - Major loss of function.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-6603919 Stackwalking crash on x86 -server with Sun Studio's collect -j on

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

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                sgoldman Steve Goldman (Inactive)
                sgoldman Steve Goldman (Inactive)
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