Commit 180040b8 authored Feb 05, 2010 by Christoph Hellwig Committed by Alex Elder Feb 12, 2010

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>

parent 87185517

fs/xfs/xfs_vnodeops.c

+8 −2

Original line number	Diff line number	Diff line
		@@ -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 {
		/*