Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8058801

G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

    XMLWordPrintable

Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 9
    • 8u40, 9
    • hotspot
    • gc
    • b37

    Backports

      Description

        The option G1TraceReclaimDeadHumongousObjectsAtYoungGC prints some information about live and dead humongous objects during early reclaim of humongous objects (JDK-8048180).

        However, it only does so when there is at least one humongous object candidate. This is problematic since this makes getting further information about humongous objects somewhat unreliable.

        The problem is that early in the GC phase, we check whether there are any candidates, and if not, skip the actual humongous reclaim phase (because there is nothing that can be reclaimed).

        It would be preferable that if G1TraceReclaimDeadHumongousObjectsAtYoungGC is set, do not skip the humongous reclaim phase even if it cannot reclaim anything, but at least print the information.

        Also, add humongous object size to the output.

        This would help analyzing for JDK-8048179.

        Attachments

          Issue Links

            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8075811 G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8077457 G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8083124 G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8086442 G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8137588 G1TraceReclaimDeadHumongousObjectsAtYoungGC only prints humongous object liveness output when there is at least one candidate humongous object

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved
            relates to

            Enhancement - null JDK-8048179 Early reclaim of large objects that are referenced by a few objects

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Enhancement - null JDK-8048180 Investigate early reclaim of large reference arrays

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Open

            Activity

              People

                sangheki Sangheon Kim
                tschatzl Thomas Schatzl
                Votes:
                0 Vote for this issue
                Watchers:
                2 Start watching this issue

                Dates

                  Created:
                  Updated:
                  Resolved: