The test calls the JVM with various permutations of +UseLargePages and UseTransparentHugePages, then checks that the regions printed out with -Xlog:pagesize are, in fact, allocated with the printed-out page size (scanning smaps).

The underlying problem here is that we trip over https://bugs.openjdk.org/browse/JDK-8310233, which causes the JVM to expect 1GB pages for THP when in fact it works with 2M pages.