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vm: Honour the "noreuse" flag to vm_page_unwire_managed()

Authored by markj on Feb 9 2021, 4:27 PM.



This flag indicates that the page should be enqueued near the head of
the inactive queue, skipping the LRU queue. It is used when unwiring
pages from the buffer cache following direct I/O or after I/O when
POSIX_FADV_NOREUSE or _DONTNEED advice was specified, or when
sendfile(SF_NOCACHE) completes. For the direct I/O and sendfile cases
we only enqueue the page if we decide not to free it, typically because
it's mapped.

Pass "noreuse" through to vm_page_release_toq() so that we actually
honour the desired LRU policy.

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R10 FreeBSD src repository
Automatic diff as part of commit; lint not applicable.
Automatic diff as part of commit; unit tests not applicable.