Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8210498

nmethod entry barriers

    XMLWordPrintable

    Details

    • Type: Enhancement
    • Status: Resolved
    • Priority: P4
    • Resolution: Fixed
    • Affects Version/s: 9, 10, 11, 12
    • Fix Version/s: 12
    • Component/s: hotspot
    • Labels:
      None
    • Subcomponent:
    • Resolved In Build:
      b16

      Description

      In order to implement concurrent class unloading, a mechanism will be required to arm nmethods in a safepoint such that the first entry into an nmethod after the pause triggers a barrier before continuing.

      The barrier will be used for:
        * Patching immediate oops, and keeping phantomly reachable oops alive through the nmethod entry
        * Cleaning IC caches that are potentially stale after class unloading
        * Detecting entries through stale IC caches during unloading

        Attachments

          Issue Links

            Activity

              People

              Assignee:
              eosterlund Erik Ă–sterlund
              Reporter:
              eosterlund Erik Ă–sterlund
              Votes:
              0 Vote for this issue
              Watchers:
              3 Start watching this issue

                Dates

                Created:
                Updated:
                Resolved: