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Our current handling of direct I/O completions is rather suboptimal, because we defer it to a workqueue more often than needed, and we perform a much to aggressive flush of the workqueue in case unwritten extent conversions happen. This patch changes the direct I/O reads to not even use a completion handler, as we don't bother to use it at all, and to perform the unwritten extent conversions in caller context for synchronous direct I/O. For a small I/O size direct I/O workload on a consumer grade SSD, such as the untar of a kernel tree inside qemu this patch gives speedups of about 5%. Getting us much closer to the speed of a native block device, or a fully allocated XFS file. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Alex Elder <aelder@sgi.com> |
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kmem.c | ||
kmem.h | ||
mrlock.h | ||
sv.h | ||
time.h | ||
xfs_acl.c | ||
xfs_aops.c | ||
xfs_aops.h | ||
xfs_buf.c | ||
xfs_buf.h | ||
xfs_cred.h | ||
xfs_export.c | ||
xfs_export.h | ||
xfs_file.c | ||
xfs_fs_subr.c | ||
xfs_globals.c | ||
xfs_globals.h | ||
xfs_ioctl32.c | ||
xfs_ioctl32.h | ||
xfs_ioctl.c | ||
xfs_ioctl.h | ||
xfs_iops.c | ||
xfs_iops.h | ||
xfs_linux.h | ||
xfs_quotaops.c | ||
xfs_stats.c | ||
xfs_stats.h | ||
xfs_super.c | ||
xfs_super.h | ||
xfs_sync.c | ||
xfs_sync.h | ||
xfs_sysctl.c | ||
xfs_sysctl.h | ||
xfs_trace.c | ||
xfs_trace.h | ||
xfs_version.h | ||
xfs_vnode.h | ||
xfs_xattr.c |