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  1. JDK
  2. JDK-8233919

Incrementally calculate the occupied cards in a heap region remembered set

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    • gc
    • b26

    Description

      Currently a remembered set's occupancy is calculated from its components. This is problematic for a few reasons:

      - slow on remembered sets with lots of components, which causes lots of additional code to avoid recalculation or mitigations
      - may cause the total count going down temporarily when calculating during coarsening; attempting to account for this adds additional code

      Particularly for updating predictions at mutator time such a temporary wrong value may cause unexpected prediction results.

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          Bug - A problem which impairs or prevents the functions of the product. JDK-8231579 G1's incremental calculation of region elapsed time always uses the same age group for prediction

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8233997 Some members of HeapRegion are not cleared in HeapRegion::hr_clear()

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8233998 New young regions registered too early in collection set

          • P3 - Major loss of function.
          • Resolved
          relates to

          Enhancement - null JDK-8237500 Increase the G1 eager reclaim candidate selection threshold

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

          Enhancement - null JDK-8267836 Separate eager reclaim remembered set threshold from G1RSetSparseRegionEntries

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

          Enhancement - null JDK-8017163 G1: Refactor remembered sets

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

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              tschatzl Thomas Schatzl
              tschatzl Thomas Schatzl
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                Updated:
                Resolved: