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  1. JDK
  2. JDK-8222992

Shenandoah: Pre-evacuate all roots

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    • gc
    • b20

    Description

      Since we switched to strong to-space invariant, if we pre-evacuate all roots, the roots should only contain to-space references, until next evacuation cycle. Therefore, we can avoid a couple of update roots calls. Also, make code easy to reason.

      The change may prolong final_mark pause. It is temporary. I intent to move several pre-evacuated roots to concurrent phase, in followup RFEs.

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          Enhancement - null JDK-8223215 Shenandoah: Support verifying subset of roots

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

          Enhancement - null JDK-8223951 Shenandoah: Only need to update thread roots during final update refs

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8229865 Use explicit #include debug.hpp for STATIC_ASSERT in gc/shenandoah/shenandoahUtils.cpp

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8230024 Shenandoah: remove unnecessary ShenandoahTimingConverter

          • P2 - Crashes, loss of data, severe memory leak.
          • Resolved

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              zgu Zhengyu Gu
              zgu Zhengyu Gu
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