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xfs: optimize log flushing in xfs_fsync
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>
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1 changed files with 8 additions and 2 deletions
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@ -629,8 +629,14 @@ xfs_fsync(
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*/
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xfs_iunlock(ip, XFS_ILOCK_SHARED);
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if (xfs_ipincount(ip)) {
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error = _xfs_log_force(ip->i_mount, XFS_LOG_SYNC,
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&log_flushed);
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if (ip->i_itemp->ili_last_lsn) {
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error = _xfs_log_force_lsn(ip->i_mount,
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ip->i_itemp->ili_last_lsn,
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XFS_LOG_SYNC, &log_flushed);
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} else {
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error = _xfs_log_force(ip->i_mount,
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XFS_LOG_SYNC, &log_flushed);
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}
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}
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} else {
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/*
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