From: Theodore Ts'o <tytso@mit.edu>
Date: Wed, 4 Aug 2010 01:35:12 +0000 (-0400)
Subject: jbd2: Change j_state_lock to be a rwlock_t
X-Git-Tag: v2.6.36-rc1~501^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a931da6ac9331a6c80dd91c199105806f2336188;p=pandora-kernel.git

jbd2: Change j_state_lock to be a rwlock_t

Lockstat reports have shown that j_state_lock is a major source of
lock contention, especially on systems with more than 4 CPU cores.  So
change it to be a read/write spinlock.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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