During the review of JDK-8140327 [1] Vladimir Kozlov suggested to possibly modify the test to allow testing a subset of the values automatically generated for a flag:

"I see that a lot of flags are removed from testing because upper limit testing can cause OOM.
May be the test should be modified to at least test low limit for these flags. But it is an other RFE."

Excluding only a subset of the values for a flag might be applicable, for example, to the G1RSetRegionEntries and to the G1RSetSparseRegionEntries flags.

[1] http://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2015-November/019837.html