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  1. JDK
  2. JDK-8256213

Remove os::split_reserved_memory

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Details

    • Enhancement
    • Status: Resolved
    • P4
    • Resolution: Fixed
    • 16
    • 17
    • hotspot
    • None
    • b03

    Description

      The ReservedSpace::first_part(..., split=true) API calls os::split_reserved_memory(), which cannot be implemented correctly on Windows (JDK-8253649) and if the underlying memory was not allocate by mmap (JDK-8257040).

      It's used only by CDS (to be removed in JDK-8255917) and heterogenous heap (to be removed in JDK-8256181).

      Afterwards, we should remove these two APIs to avoid future misuse.

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        Issue Links

          duplicates

          Bug - A problem which impairs or prevents the functions of the product. JDK-8255917 runtime/cds/SharedBaseAddress.java failed "assert(reserved_rgn != 0LL) failed: No reserved region"

          • P3 - Major loss of function.
          • Resolved

          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-8256181 Remove Allocation of old generation on alternate memory devices functionality

          • 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-8257040 [posix] os::split_reserved_memory will not work as expected on SysV shm

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

          Commit Commit openjdk/jdk/06c24e14

          Review Review openjdk/jdk/1825

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            People

              minqi Yumin Qi
              iklam Ioi Lam
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              Dates

                Created:
                Updated:
                Resolved: