Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8224584

Shenandoah: Eliminate forwarding pointer word

    XMLWordPrintable

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 8-shenandoah, 11-shenandoah, 13
    • Fix Version/s: 13
    • Component/s: hotspot
    • Subcomponent:
      gc
    • Resolved In Build:
      b23
    • CPU:
      generic
    • OS:
      generic

      Backports

        Description

        Shenandoah uses an extra word per object to store the forwarding pointer of an object in support of concurrent evacuation. With the arrival of load reference barriers, it is possible to store the forwarding pointer in the then-unused memory of from-space-copy of an object instead, for example use the from-space-mark-word and encode the forwarding pointer there. This allows to eliminate the extra forwarding pointer word, and thus reduces memory footprint, and gives the GC and application more headroom to work with.

          Attachments

            Issue Links

            There are no Sub-Tasks for this issue.

              Activity

                People

                Assignee:
                rkennke Roman Kennke
                Reporter:
                rkennke Roman Kennke
                Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                  Dates

                  Created:
                  Updated:
                  Resolved: