Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8231087

Shenandoah: Self-fixing load reference barriers for C1/C2

    XMLWordPrintable

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 8-shenandoah, 11-shenandoah, 14
    • Fix Version/s: 14
    • Component/s: hotspot
    • Subcomponent:
      gc
    • Resolved In Build:
      b15
    • CPU:
      generic
    • OS:
      generic

      Description

      One significant contributor to Shenandoah's barrier performance is the LRB-midpath performance: when heap is unstable *and* the loaded reference is in cset, we then check if the object is forwarded and if not, call out into the slow-path. A way to avoid this is to update references right in the slow-path. This avoids triggering the cset-check on next access of the same field.

        Attachments

          Issue Links

            Activity

              People

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

                Dates

                Created:
                Updated:
                Resolved: