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

Description

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

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 for these scenarios.

Reported by: bdrewery
Reviewed by: alc, kib
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D28555

Details

Provenance
markjAuthored on Feb 10 2021, 4:10 PM
Reviewer
alc
Differential Revision
D28555: vm: Honour the "noreuse" flag to vm_page_unwire_managed()
Parents
R10:7676b388adbc: Always build the sanitizer runtimes when compiling with clang
Branches
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