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| author | Jens Axboe <axboe@suse.de> | 2005-10-20 16:42:29 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2005-10-28 08:45:08 +0200 |
| commit | b4878f245ec8e168cdd1f170f823a750b7dd4af5 (patch) | |
| tree | de784c2a7e1174e4843807998f0356bf92ee78be /include/linux/blkdev.h | |
| parent | d9ebb192aa13a026edc6faff137dcb14f2c91731 (diff) | |
| download | blackbird-op-linux-b4878f245ec8e168cdd1f170f823a750b7dd4af5.tar.gz blackbird-op-linux-b4878f245ec8e168cdd1f170f823a750b7dd4af5.zip | |
[PATCH] 02/05: update ioscheds to use generic dispatch queue
This patch updates all four ioscheds to use generic dispatch
queue. There's one behavior change in as-iosched.
* In as-iosched, when force dispatching
(ELEVATOR_INSERT_BACK), batch_data_dir is reset to REQ_SYNC
and changed_batch and new_batch are cleared to zero. This
prevernts AS from doing incorrect update_write_batch after
the forced dispatched requests are finished.
* In cfq-iosched, cfqd->rq_in_driver currently counts the
number of activated (removed) requests to determine
whether queue-kicking is needed and cfq_max_depth has been
reached. With generic dispatch queue, I think counting
the number of dispatched requests would be more appropriate.
* cfq_max_depth can be lowered to 1 again.
Original from Tejun Heo, modified version applied.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'include/linux/blkdev.h')
0 files changed, 0 insertions, 0 deletions
