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  1. JDK
  2. JDK-8216557

Aarch64: Add support for Concurrent Class Unloading

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    • gc
    • b21
    • aarch64
    • linux

    Description

      To further improve pause times, we'll need to implement concurrent class unloading for Aarch64. This is dependent on ZGC being merged.

      The fundamental problem to be solved is how we implement the nmethod entry barrier, as the method used by x86 won't use - we can't atomically change an immediate address atomically. In principle we could expand on the entry barrier used already on aarch64, but perhaps expand it's applicability to nmethod entry too.

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          Enhancement - null JDK-8241793 Shenandoah: Enable concurrent class unloading for aarch64

          • P3 - Major loss of function.
          • Resolved
          is blocked by

          Enhancement - null JDK-8214527 AArch64: ZGC for Aarch64

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

          Enhancement - null JDK-8214897 ZGC: Concurrent Class Unloading

          • 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-8274501 c2i entry barriers read int as long on AArch64

          • P2 - Crashes, loss of data, severe memory leak.
          • Closed
          links to

          Review Review openjdk/jdk13u-dev/282

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              smonteith Stuart Monteith
              smonteith Stuart Monteith
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