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  1. JDK
  2. JDK-8218049

Survivor MemoryMXBean used() size granularity is region based

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    • Subcomponent:
      gc
    • Resolved In Build:
      b16

      Description

      The used() of survivor space MemoryMXBean is based on region granularity. I.e. a survivor region can either be fully used or not.

      This causes failures for tests that use the used() value of that MemoryMXBean (linked below) as they do not expect such large jumps in usage after allocation of a few (more) objects in survivor space.

      This is day one behavior (and some of these tests have been excluded from testing for a long time now).

      After fixing, also re-enable the corresponding tests, verifying that they work again.

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          Bug - A problem which impairs or prevents the functions of the product. JDK-8081688 SurvivorAlignmentInBytes tests too lenient

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

          Enhancement - null JDK-8220089 G1 reuse survivor region as eden region at the end of gc

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8177765 gc/survivorAlignment/TestPromotionFromSurvivorToTenuredAfterMinorGC.java: Actual memory usage should not deviate from expected

          • P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8190277 TestPromotionToSurvivor - Actual memory usage should not deviate from expected

          • P3 - Major loss of function.
          • Closed

          Bug - A problem which impairs or prevents the functions of the product. JDK-8129886 Test TestPromotionToSurvivor fails with jimage refresh

          • P5 - Cosmetic problem like misspelt words or misaligned text.
          • Closed
          relates to

          Enhancement - null JDK-8221994 Improve consistency between actual values and MemoryUsage.used() in MBeans

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

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              Assignee:
              sangheki Sangheon Kim
              Reporter:
              tschatzl Thomas Schatzl
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                Created:
                Updated:
                Resolved: