From owner-cvs-all  Sat Dec 28 13: 3:43 2002
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From: Matt Dillon <dillon@FreeBSD.org>
Date: Sat, 28 Dec 2002 13:03:42 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/sys/vm vm_object.c vm_pager.h vnode_pager.c
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dillon      2002/12/28 13:03:42 PST

  Modified files:
    sys/vm               vm_object.c vm_pager.h vnode_pager.c 
  Log:
  Allow the VM object flushing code to cluster.  When the filesystem syncer
  comes along and flushes a file which has been mmap()'d SHARED/RW, with
  dirty pages, it was flushing the underlying VM object asynchronously,
  resulting in thousands of 8K writes.  With this change the VM Object flushing
  code will cluster dirty pages in 64K blocks.
  
  Note that until the low memory deadlock issue is reviewed, it is not safe
  to allow the pageout daemon to use this feature.  Forced pageouts still
  use fs block size'd ops for the moment.
  
  MFC after:      3 days
  
  Revision  Changes    Path
  1.250     +10 -3     src/sys/vm/vm_object.c
  1.37      +4 -2      src/sys/vm/vm_pager.h
  1.165     +8 -2      src/sys/vm/vnode_pager.c

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