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  1. JDK
  2. JDK-8149365

aarch64: memory copy does not prefetch on backwards copy

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9
    • Fix Version/s: 9
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b107
    • CPU:
      aarch64
    • OS:
      linux

      Description

      The implementation of memory_copy_longs in aarch64 does not do prefetch on backwards copies.

      This can have a significant performance impact on some micro arches.

      In addition there is a feature where -XX:PrefetchCopyIntervalInBytes is ignored and always set to 256

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            • Assignee:
              enevill Ed Nevill
              Reporter:
              enevill Ed Nevill
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              • Created:
                Updated:
                Resolved: