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  1. JDK
  2. JDK-8233111

Epoch shift synchronization point for Compiler threads

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    • jfr
    • b29

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      Description

        JFR artifact tagging is a function of an epoch and transitioning between epochs happens during a safepoint.

        This works well for threads that respect safepoints, but for threads that run _thread_in_native writing events that have a relation to an artifact, for example a Method, they race against the epoch shift. A consequence of a race condition is that an artifact being tagged in the wrong epoch does not become visible to the event referencing it.This situation mainly applies to Compiler Threads (i.e. JavaThreads running _thread_in_native).

        With JFR Event Streaming, the events must continuously be fully parsable as a unit, and an artifact tag race will therefore cause problems for the parser.

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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-8236782 Epoch shift synchronization point for Compiler threads

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8230400 Missing constant pool entry for a method in stacktrace

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8280844 Epoch shift synchronization point for Compiler threads is inadequate

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8281520 JFR: A wrong parameter is passed to the constructor of LeakKlassWriter

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

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                mgronlun Markus Grönlund
                mgronlun Markus Grönlund
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