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jbd2: Change j_state_lock to be a rwlock_t

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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>
This commit is contained in:
Theodore Ts'o
2010-08-03 21:35:12 -04:00
parent a51dca9cd3
commit a931da6ac9
8 changed files with 114 additions and 110 deletions
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2
include/linux/jbd2.h
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@ -764,7 +764,7 @@ struct journal_s
/*
* Protect the various scalars in the journal
*/
spinlock_t j_state_lock;
rwlock_t j_state_lock;
/*
* Number of processes waiting to create a barrier lock [j_state_lock]