In case of large page commit failure (1G/2M pages) we are partially un-reserving the memory which leaves holes in the virtual address space.
https://github.com/openjdk/jdk/blob/master/src/hotspot/os/linux/os_linux.cpp#L4030
https://github.com/openjdk/jdk/blob/master/src/hotspot/os/linux/os_linux.cpp#L4030
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Review openjdk/jdk/7350