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  1. JDK
  2. JDK-8256181

Remove Allocation of old generation on alternate memory devices functionality

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    • gc
    • b25

    Description

      With JDK-8202286 functionality to put the old generation of generational collectors (parallel, g1) has been introduced.

      The idea has been that it could be used to allow use of "cheaper" memory for a larger old gen, in ultimately improving application performance.

      However there has been no uptake of this feature and there are no maintainers. Several minor issues with it have been open for a while with no signs of effort fixing these (some issues linked). At the other hand it requires some constant maintenance when developing new features in the heap management area.

      I.e. the code has started to bit rot, nobody uses it, and takes time to try to support it in conjunction with new features.

      The flag covering this functionality, AllocateOldGenAt is experimental.

      So the functionality can be removed.

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          duplicates

          Enhancement - null JDK-8256213 Remove os::split_reserved_memory

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8217666 gc/nvdimm/* should not be included any tiers

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8217406 gc/nvdimm/Test*ObjectsOnNvdimm.java failure

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8256079 Heterogeneous Heap may fail silently on Windows

          • P3 - Major loss of function.
          • Closed

          Enhancement - null JDK-8215893 Add better abstraction for pinning G1 concurrent marking bitmaps.

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

          Enhancement - null JDK-8202286 Allocation of old generation of Java heap on alternate memory devices

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

          Commit Commit openjdk/jdk/bd8693a0

          Review Review openjdk/jdk/1162

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              tschatzl Thomas Schatzl
              tschatzl Thomas Schatzl
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              Dates

                Created:
                Updated:
                Resolved: