"Max = 0K" in the following "Current rem set statistics" is confusing.

  Total heap region code root sets sizes = 98K. Max = 0K.
           0K ( 0.7%) by 93 Young regions
           0K ( 0.0%) by 4 Humonguous regions
           0K ( 0.6%) by 79 Free regions
          96K ( 98.6%) by 336 Old regions
    79865 code roots represented.
            0 ( 0.0%) elements by 93 Young regions
            0 ( 0.0%) elements by 4 Humonguous regions
            0 ( 0.0%) elements by 79 Free regions
        79865 (100.0%) elements by 336 Old regions
    Region with largest amount of code roots =
511:(E)[0x00000000ffc00000,0x0000000100000000,0x0000000100000000], size = 0K,
num_elems = 0.

The size (i.e., in "Max" and "size") reported seems to be limited to
"strongly" reachable.

If the the max of code root sets size is 0K. The total should be 0K too.
Hence the confusing part.

The following flags have been used for the summary report:

-XX:+UnlockDiagnosticVMOptions -XX:+G1SummarizeRSetStats
-XX:G1SummarizeRSetStatsPeriod=10