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author | Jens Axboe <jaxboe@fusionio.com> | 2011-03-21 10:14:27 +0100 |
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committer | Jens Axboe <jaxboe@fusionio.com> | 2011-03-21 10:14:27 +0100 |
commit | 5e84ea3a9c662dc2d7a48703a4468fad954a3b7f (patch) | |
tree | 3fa0fb26a7c8a970213584104cc2498ef46d60a3 /fs/partitions | |
parent | 4345caba340f051e10847924fc078ae18ed6695c (diff) |
block: attempt to merge with existing requests on plug flush
One of the disadvantages of on-stack plugging is that we potentially
lose out on merging since all pending IO isn't always visible to
everybody. When we flush the on-stack plugs, right now we don't do
any checks to see if potential merge candidates could be utilized.
Correct this by adding a new insert variant, ELEVATOR_INSERT_SORT_MERGE.
It works just ELEVATOR_INSERT_SORT, but first checks whether we can
merge with an existing request before doing the insertion (if we fail
merging).
This fixes a regression with multiple processes issuing IO that
can be merged.
Thanks to Shaohua Li <shaohua.li@intel.com> for testing and fixing
an accounting bug.
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'fs/partitions')
0 files changed, 0 insertions, 0 deletions