Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-8275056

Virtualize G1CardSet containers over heap region

    XMLWordPrintable

Details

    • gc
    • b24

    Description

      Currently there is a 1:1 mapping between the area G1CardSet can cover and the size of a heap region.
      This in effect limits heap region size to the maximum any container can cover, i.e. 2^16 cards, i.e. 2^25 bytes = 32MB.

      This is an unnecessary restriction since introduction of JDK-8017163. G1CardSet may as well use "virtual" regions, i.e. subdivide the heap region size in chunks of the size of the maximum any container can cover.

      This change also allows arbitrary combinations of the card table size with any heap region size (unless otherwise limited) currently investigated in JDK-8272773.

      Attachments

        Issue Links

          csr for

          CSR - null JDK-8275266 Virtualize G1CardSet containers over heap region

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

          Enhancement - null JDK-8272774 Allow heap region sizes larger than 32M with larger card table entry sizes

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8276540 Howl Full CardSet container iteration marks too many cards

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

          Enhancement - null JDK-8275055 Improve HeapRegionRemSet::split_card()

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

          Enhancement - null JDK-8276548 Use range based visitor for Howl-Full cards

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

          Enhancement - null JDK-8017163 G1: Refactor remembered sets

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

          Enhancement - null JDK-8272773 Configurable card table card size

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

          Bug - A problem which impairs or prevents the functions of the product. JDK-8286943 G1: With virtualized remembered sets, maximum number of cards configured is wrong

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

          Commit Commit openjdk/jdk/1830b8da

          Review Review openjdk/jdk/6059

          Activity

            People

              tschatzl Thomas Schatzl
              tschatzl Thomas Schatzl
              Votes:
              0 Vote for this issue
              Watchers:
              5 Start watching this issue

              Dates

                Created:
                Updated:
                Resolved: