Could MADV_REMOVE work with hugetlbfs?

[Adam M. Costello]

madvise(MADV_REMOVE) punches a hole in a file (via truncate_range()).
It's the only way (as far as I know) to return an arbitrary page of
shared memory to the system.  It's supported by tmpfs, but not by
hugetlbfs.

So a regular page of shared memory (from shmget() or from mmap() on
a tmpfs file) can be returned, but huge page of shared memory (from
shmget(SHM_HUGETLB) or from mmap() on a hugetlbfs file) cannot be
returned.

Has anyone thought about adding support for truncate_range and
MADV_REMOVE to hugetlbfs?  How hard would that be?

Thanks,
AMC
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