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From: Peter Wemm <peter@FreeBSD.ORG>
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Date: Fri, 17 Apr 1998 23:26:17 -0700 (PDT)
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To: cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG, cvs-sys@FreeBSD.ORG
Subject: cvs commit: src/sys/kern vfs_subr.c
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peter       1998/04/17 23:26:17 PDT

  Modified files:
    sys/kern             vfs_subr.c 
  Log:
  In vfs_msync(), test to see if the vnode being examined is "interesting"
  (ie: it has a vm_object attached and is marked as OBJ_MIGHTBEDIRTY) before
  attempting to lock it.  This should reduce the cpu hit that is incurred
  when doing a sync(2) and when the syncer process is doing the 30-second
  writeback of dirty mmap() data to disk.  Skip this speedup if we are
  doing an unmount() to be sure to get everything - we can afford to
  occasionally miss a msync while the system is running, but not at unmount.
  
  I'm not sure about the VXLOCK and MNT_WAIT case, it seems a bit odd to skip
  doing a page_clean at unmount time just because a vnode is VXLOCKed, but
  that's what was being done before...
  
  Revision  Changes    Path
  1.151     +10 -3     src/sys/kern/vfs_subr.c

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