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  1. JDK
  2. JDK-8271579

G1: Move copy before CAS in do_copy_to_survivor_space

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    • gc
    • b12

    Description

      Propose to move copy before CAS in do_copy_to_survivor_space, as we found this will improve G1 performance. Specjbb shows 3.7% in critical on aarch64, no change in max.
      (For JDK 11, the improvement is better.)

      After this change copy_to_survivor in G1 is also aligned with PS's copy_to_survivor.

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          Enhancement - null JDK-8272070 G1: Simplify age calculation after JDK-8271579

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

          Enhancement - null JDK-8269870 PS: Membar in PSPromotionManager::copy_unmarked_to_survivor_space could be relaxed

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

          Commit Commit openjdk/jdk/d874e961

          Review Review openjdk/jdk17u-dev/42

          Review Review openjdk/jdk/4983

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              mli Hamlin Li
              mli Hamlin Li
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