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xfs: optimize log flushing in xfs_fsync

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If we have a pinned inode it must have a log item attached to it.
Usually that log item will have ili_last_lsn already set, in which
case we only need to flush the log up to that LSN instead of doing a
full log force.  This gives speedups of about 5% in some fsync heavy
workloads.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig 2010-02-05 09:57:55 +00:00 committed by Alex Elder
parent 87185517de
commit 180040b89e
1 changed files with 8 additions and 2 deletions
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10
fs/xfs/xfs_vnodeops.c
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@ -629,8 +629,14 @@ xfs_fsync(
*/
xfs_iunlock(ip, XFS_ILOCK_SHARED);
if (xfs_ipincount(ip)) {
error = _xfs_log_force(ip->i_mount, XFS_LOG_SYNC,
&log_flushed);
if (ip->i_itemp->ili_last_lsn) {
error = _xfs_log_force_lsn(ip->i_mount,
ip->i_itemp->ili_last_lsn,
XFS_LOG_SYNC, &log_flushed);
} else {
error = _xfs_log_force(ip->i_mount,
XFS_LOG_SYNC, &log_flushed);
}
}
} else {
/*