As per Andrew's thread, the OpenJDK builds should not have a jvisualvm man page installed.
The new build process (makefiles) in jdk8 doesn't appear to have this issue but it does need correction in the old(er) jdk8 and 7u makefile structure. Andrew will post a webrev.
Actually, rereading the jdk8/makefiles code (jdk/makefiles/Images.gmk) - the jvisualvm man page is filtered out only for MacOS at moment. It needs to be filtered out for OpenJDK builds also.