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From: John Baldwin <jhb@FreeBSD.org>
Date: Wed, 28 Jan 2009 19:05:18 +0000 (UTC)
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Subject: cvs commit: src/sys/kern vfs_cache.c
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jhb         2009-01-28 19:05:18 UTC

  FreeBSD src repository

  Modified files:
    sys/kern             vfs_cache.c 
  Log:
  SVN rev 187839 on 2009-01-28 19:05:18Z by jhb
  
  Convert the global mutex protecting the directory lookup name cache from a
  mutex to a reader/writer lock.  Lookup operations first grab a read lock and
  perform the lookup.  If the operation results in a need to modify the cache,
  then it tries to do an upgrade.  If that fails, it drops the read lock,
  obtains a write lock, and redoes the lookup.
  
  Revision  Changes    Path
  1.135     +81 -46    src/sys/kern/vfs_cache.c