https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222356

--- Comment #12 from [email protected] ---
A commit references this bug:

Author: kib
Date: Tue Sep 19 16:46:37 UTC 2017
New revision: 323768
URL: https://svnweb.freebsd.org/changeset/base/323768

Log:
  For unlinked files, do not msync(2) or sync on the vnode deactivation.

  One consequence of the patch is that msyncing unlinked file mappings
  no longer reduces the amount of the dirty memory in the system, but I
  do not think that there are users of msync(2) that utilize it for such
  side-effect.

  Reported and tested by:       tjil
  PR:   222356
  Reviewed by:  alc
  Sponsored by: The FreeBSD Foundation
  MFC after:    2 weeks
  Differential revision:        https://reviews.freebsd.org/D12411

Changes:
  head/sys/kern/vfs_subr.c
  head/sys/vm/vm_object.c

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