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  1. JDK
  2. JDK-8203305

PPC64: Improve TM detection for enabling RTM on Linux / POWER9

    Details

    • Introduced In Version:
      9
    • Resolved In Build:
      b15
    • CPU:
      ppc
    • OS:
      linux

      Backports

        Description

        Previously RTM (aka HTM on Power) was enabled on Linux following a conservative approach the consisted in parsing kernel's major/minor version and avoiding the old ones.

        Currenlty HTM support on POWER9 is (due to an issue with its implementation in the die) has a new mode called "TM with No Suspend Mode" which is not mature yet and so JVM should not at the moment enable RTM when running on these machines (that new mode is advertised by the kernel in AUXV as PPC_FEATURE2_HTM_NO_SUSPEND).

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                • Assignee:
                  gromero Gustavo Romero
                  Reporter:
                  gromero Gustavo Romero
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                  • Created:
                    Updated:
                    Resolved: