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  1. JDK
  2. JDK-6490394

G1: Allow heap shrinking / memory unmapping after reclaiming regions during Remark

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    • gc
    • b18
    • generic
    • generic

      Right now G1 can only expand the heap outside of full GC, never shrink it.

      Given that G1 does incrementally compact the heap, it might be a good opportunity to do that whenever regions are actually made available again (GC cleanup, possibly at the end of the mixed gc cycle).

        1. 20190807-jdk11backportRemarkResize-dacapoLarge100MTo4G-h2.html
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        		 Release Note: G1 May Uncommit Memory During Marking Cycle Sub-task Closed Unassigned  

            tschatzl Thomas Schatzl
            tonyp Tony Printezis
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