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  1. JDK
  2. JDK-8237143

Eliminate DirtyCardQ_cbl_mon

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    • gc
    • b10

    Description

      The DirtyCardQ_cbl_mon is used to

      (1) provide exclusive access to the G1DirtyCardQueueSet completed buffer queue, and

      (2) provide notification by mutators to the primary ConcurrentRefineThread that there are enqueued buffers that should be processed by refinement threads.

      This can lead to performance issues from lock contention, as all running mutator and concurrent refinement threads are occasionally taking that lock.

      A lock-free buffer queue would fix the buffer queue contention problem.

      There is still a residual source of contention from using a HotSpot Monitor for notification. A different notification mechanism might address that, or perhaps polling by the primiary concurrent refinement thread.

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          relates to

          Enhancement - null JDK-8238867 Improve G1DirtyCardQueueSet::Queue::pop

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

          Enhancement - null JDK-8238979 Improve G1DirtyCardQueueSet handling of previously paused buffers

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

          Enhancement - null JDK-8280917 Simplify G1ConcurrentRefineThread activation

          • 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-8279957 Main refinement thread tries to wake up itself when re-enqueuing causing assertion failure

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

          Enhancement - null JDK-8162929 Enqueuing dirty cards into a single DCQS during GC does not scale

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

          Enhancement - null JDK-8263551 Provide shared lock-free FIFO queue implementation

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

          Commit Commit openjdk/panama-foreign/ccbd819a

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              kbarrett Kim Barrett
              kbarrett Kim Barrett
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                Created:
                Updated:
                Resolved: