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author | Christoph Hellwig <hch@infradead.org> | 2010-07-18 21:17:11 +0000 |
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committer | Alex Elder <aelder@sgi.com> | 2010-07-26 16:09:19 -0500 |
commit | 209fb87a259ead17e966627b7f053d16a96898da (patch) | |
tree | 2cb348a32e2c1488cfb14189e975bcbcb6a0695f /include | |
parent | fb511f2150174b18b28ad54708c1adda0df39b17 (diff) | |
download | linux-3.10-209fb87a259ead17e966627b7f053d16a96898da.tar.gz linux-3.10-209fb87a259ead17e966627b7f053d16a96898da.tar.bz2 linux-3.10-209fb87a259ead17e966627b7f053d16a96898da.zip |
xfs simplify and speed up direct I/O completions
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>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions