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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" <[email protected]>
This commit is contained in:
Theodore Ts'o 2010-08-03 21:35:12 -04:00
commit a931da6ac9
8 changed files with 114 additions and 110 deletions
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4
fs/ocfs2/journal.c
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@ -760,13 +760,13 @@ void ocfs2_set_journal_params(struct ocfs2_super *osb)
if (osb->osb_commit_interval)
commit_interval = osb->osb_commit_interval;
spin_lock(&journal->j_state_lock);
write_lock(&journal->j_state_lock);
journal->j_commit_interval = commit_interval;
if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
journal->j_flags |= JBD2_BARRIER;
else
journal->j_flags &= ~JBD2_BARRIER;
spin_unlock(&journal->j_state_lock);
write_unlock(&journal->j_state_lock);
}
int ocfs2_journal_init(struct ocfs2_journal *journal, int *dirty)