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  1. JDK
  2. JDK-8194681

G1 uses young free cset time when reporting non-young free cset times

    Details

    • Type: Bug
    • Status: Resolved
    • Priority: P3
    • Resolution: Fixed
    • Affects Version/s: 9, 10, 11
    • Fix Version/s: 10
    • Component/s: hotspot
    • Labels:
    • Subcomponent:
      gc
    • Resolved In Build:
      b39

      Backports

        Description

        In g1CollectedHeap.cpp at the end of the G1FreeCollectionSetTask::work() method, young_time is reported as G1GCPhaseTimes::NonYoungFreeCSet.

        if (has_non_young_time) {
              timer->record_time_secs(G1GCPhaseTimes::NonYoungFreeCSet, worker_id, young_time);
        }

        This screws up timing predictions as this value is used for predicting non-young region elapsed time.

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                • Assignee:
                  lkorinth Leo Korinth
                  Reporter:
                  lkorinth Leo Korinth
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                  • Created:
                    Updated:
                    Resolved: