[XFS] Improve xfsbufd delayed write submission patterns, after blktrace

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analysis.

Under a sequential create+allocate workload, blktrace reported backward
writes being issued by xfsbufd, and frequent inappropriate queue unplugs.
We now insert at the tail when moving from the delwri lists to the temp
lists, which maintains correct ordering, and we avoid unplugging queues
deep in the submit paths when we'd shortly do it at a higher level anyway.
blktrace now reports much healthier write patterns from xfsbufd for this
workload (and likely many others).

SGI-PV: 954310
SGI-Modid: xfs-linux-melb:xfs-kern:26396a

Signed-off-by: Nathan Scott <nathans@sgi.com>
Signed-off-by: Tim Shimmin <tes@sgi.com>

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Nathan Scott 2006-09-28 10:52:15 +10:00 • committed by Tim Shimmin

parent f37ea14969

commit f07c225036

1 changed files with 14 additions and 10 deletions

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fs/xfs/linux-2.6/xfs_buf.c

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