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  1. JDK
  2. JDK-8233279

G1: GCLocker GC with +GCLockerInvokesConcurrent spins while cycle in progress

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    • Subcomponent:
      gc
    • Resolved In Build:
      b24

      Description

      When using G1, a GCLocker GC (GCCause::_gc_locker) with the product flag GCLockerInvokesConcurrent turned on (fortunately not the default) will spin in try_collect while there is a concurrent marking cycle already in progress. This will block the JNI critical section exiter, as well as any other threads that are in GCLocker::stall_until_clear().

      This is very similar behavior to an old CMS bug (JDK-6919638), though even worse in this case because it's a spin-wait rather than blocking on a monitor.

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              • Assignee:
                kbarrett Kim Barrett
                Reporter:
                kbarrett Kim Barrett
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