Date: Wed, 28 Jan 2009 19:05:18 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/kern vfs_cache.c Message-ID: <200901281905.n0SJ5OKe093327@repoman.freebsd.org>
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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
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