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  1. JDK
  2. JDK-8213229

Investigate treating StringTable as weak in young collections

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Details

    • Enhancement
    • Resolution: Fixed
    • P4
    • 13
    • None
    • hotspot
    • gc
    • b06
    • generic
    • generic

    Description

      Current STW collectors presently treat the StringTable as a strong root in young collections. This avoids the need to walk the StringTable and delete dead entries in a young collection. Instead it walks the StringTable and marks all the strings, as one of the in-parallel root marking phases.

      With the recent reimplementation of the StringTable using ConcurrentHashtable and OopStorage, treating it as a strong root rather than a weak root in young collections may no longer provide best performance.

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        Issue Links

          blocks

          Enhancement - null JDK-8217578 Shenandoah cleanup unused timings after concurrent string table change

          • 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-8217778 StringTable cleanup miscalculates amount of dead objects

          • P3 - Major loss of function.
          • Resolved

          Bug - A problem which impairs or prevents the functions of the product. JDK-8310176 JDK 11 G1 crash during full GC with +UseStringDeduplication

          • P3 - Major loss of function.
          • Resolved

          Enhancement - null JDK-8213752 Determine StringTable content liveness concurrently in G1

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

          Enhancement - null JDK-8221558 Remove obsolete uses of OopStorage::ParState<false, false> _par_state

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

          Enhancement - null JDK-8037956 Merge String Deduplication work with String/Symbol table work

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8217522 Missing barriers in some java_lang_String assertion code after JDK-8217442

          • P1 - Blocks development and/or testing work, production could not run.
          • Closed

          Enhancement - null JDK-8213198 Not triggering concurrent cycle in G1 leaves string table cleanup deferred

          • P3 - Major loss of function.
          • Open

          Enhancement - null JDK-8215709 WeakProcessor should also report task item information

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

          Activity

            People

              tschatzl Thomas Schatzl
              kbarrett Kim Barrett
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              Dates

                Created:
                Updated:
                Resolved: