On 05/20/13 08:56, Jan Kara wrote:
On Thu 11-04-13 22:09:56, Jan Kara wrote:Writing a large file using direct IO in 16 MB chunks sometimes results in a pathological allocation pattern where 16 MB chunks of large free extent are allocated to a file in a reversed order. So extents of a file look for example as: ext logical physical expected length flags 0 0 13 4550656 1 4550656 188136807 4550668 12562432 2 17113088 200699240 200699238 622592 3 17735680 182046055 201321831 4096 4 17739776 182041959 182050150 4096 5 17743872 182037863 182046054 4096 6 17747968 182033767 182041958 4096 7 17752064 182029671 182037862 4096 ... 6757 45400064 154381644 154389835 4096 6758 45404160 154377548 154385739 4096 6759 45408256 252951571 154381643 73728 eof This happens because XFS_ALLOCTYPE_THIS_BNO allocation fails (the last extent in the file cannot be further extended) so we fall back to XFS_ALLOCTYPE_NEAR_BNO allocation which picks end of a large free extent as the best place to continue the file. Since the chunk at the end of the free extent again cannot be further extended, this behavior repeats until the whole free extent is consumed in a reversed order. For data allocations this backward allocation isn't beneficial so make xfs_alloc_compute_diff() pick start of a free extent instead of its end for them. That avoids the backward allocation pattern. See thread at http://oss.sgi.com/archives/xfs/2013-03/msg00144.html for more details about the reproduction case and why this solution was chosen. Based on idea by Dave Chinner<dchinner@xxxxxxxxxx>. CC: Dave Chinner<dchinner@xxxxxxxxxx> Reviewed-by: Dave Chinner<dchinner@xxxxxxxxxx> Signed-off-by: Jan Kara<jack@xxxxxxx> --- fs/xfs/xfs_alloc.c | 24 ++++++++++++++++++------ 1 files changed, 18 insertions(+), 6 deletions(-) v2: Updated comment and commit description.Could anybody pull this patch into XFS tree? I don't see it there... Honza
Sorry, a miscommunication on my part that this belonged in the dev tree but not in the for Linus pull for Linux 3.10.
--Mark. _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
