Uploaded image for project: 'JDK'
  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

        Activity

        Hide
        hgupdate HG Updates added a comment -
        URL: http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/7737d637e74c
        User: enevill
        Date: 2016-02-09 18:26:23 +0000
        Show
        hgupdate HG Updates added a comment - URL: http://hg.openjdk.java.net/jdk9/hs-comp/hotspot/rev/7737d637e74c User: enevill Date: 2016-02-09 18:26:23 +0000
        Hide
        hgupdate HG Updates added a comment -
        URL: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/7737d637e74c
        User: lana
        Date: 2016-02-24 20:06:28 +0000
        Show
        hgupdate HG Updates added a comment - URL: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/7737d637e74c User: lana Date: 2016-02-24 20:06:28 +0000

          People

          • Assignee:
            enevill Ed Nevill
            Reporter:
            enevill Ed Nevill
          • Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

            Dates

            • Created:
              Updated:
              Resolved: