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These flags are "diagnostic", meaning that they must be preceded by -XX:+UnlockDiagnosticVMOptions. On the command line, they must all be preceded by -XX:. They may also be placed in a flags file, .hotspotrc by default, or configurable as -XX:Flags=myhotspotrc.txt.

The plugin is defined as part of the forthcoming bug fix 6667042(minus the Gnu disassembler) is defined in the OpenJDK sources here:
http://hg.openjdk.java.net/jdk7/hotspot/hotspot/file/tip/src/share/tools/hsdis/^{Image Added}

Look at the README for instructions on building. Pre-built binaries are available (TBD... help?).

Individual methods may be printed:

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