Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8253234

Zeroing elimination optimization for allocation followed by Unsafe.copyMemory

    Details

    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      A DESCRIPTION OF THE PROBLEM :
      Currently array zeroing elimination optimization only happens when a large array allocation is followed by System.arraycopy().

      It would be great to have the same optimization for allocations followed by Unsafe.copyMemory() as well. This is a massive performance improvement for operations like array allocation followed by direct ByteBuffer's bulk get. This can also discourage projects hacking into jdk.internal.misc.Unsafe.allocateUninitializedArray().


        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                Unassigned
                Reporter:
                webbuggrp Webbug Group
              • Votes:
                0 Vote for this issue
                Watchers:
                3 Start watching this issue

                Dates

                • Created:
                  Updated: