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  1. JDK
  2. JDK-8159979

During initial mark, preparing all regions for marking may take a significant amount of time

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    • gc
    • b13

    Description

      During initial mark, in G1ConcurrentMark::checkpointRootsInitialPre() G1 iterates over all regions to set the next tams pointer to top.

      On heaps with many regions 20k+ this can take a while, as this phase is single-threaded.

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              iwalulya Ivan Walulya
              tschatzl Thomas Schatzl
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