Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8305711

Arm: C2 always enters slowpath for monitorexit

    XMLWordPrintable

Details

    • b18
    • aarch32

    Backports

      Description

        Due to a small bug in the C2 implementation of monitorexit for stacklocked locks, we always enter slow path.

        AFAICS This is a day zero bug of the arm port and got introduced with JEP 297: "Unified arm32/arm64 Port".

        It has a significant effect on locking performance, but its effect had been hidden until JDK15 by biased locking. Biased locking removal made the bug appearant.

        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-8305996 Arm: C2 always enters slowpath for monitorexit

            • 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-8306064 Arm: C2 always enters slowpath for monitorexit

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

            Commit Commit openjdk/jdk11u-dev/f0af8f99

            Commit Commit openjdk/jdk17u-dev/01cf112c

            Commit Commit openjdk/jdk/c67bbcea

            Review Review openjdk/jdk11u-dev/1826

            Review Review openjdk/jdk17u-dev/1237

            Review Review openjdk/jdk/13376

            Activity

              People

                stuefe Thomas Stuefe
                stuefe Thomas Stuefe
                Votes:
                0 Vote for this issue
                Watchers:
                4 Start watching this issue

                Dates

                  Created:
                  Updated:
                  Resolved: