[Bug 230160] linuxulator doesn't implement madvise(MADV_DONTNEED) and any MADV_ flags with values >= 8 correctly

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=230160

--- Comment #7 from Bill Sorenson <instructionset at gmail.com> ---
(In reply to David Chisnall from comment #6)
I'm aware they have different use cases. My main point is that if we are going
to adopt a Linux-MADV_DONTNEED equivalent we use Illumos' MADV_PURGE rather
than invent a new argument.

I don't object to adding MADV_PURGE or MADV_ZERO for Linux compatibility but to
me it seems like it would usually be better to call munmap() directly than to
use some bizarre madvise() semantics to simulate it although admittedly I don't
know the specifics.

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