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authorJens Axboe <jens.axboe@oracle.com>2007-04-25 12:44:27 +0200
committerJens Axboe <axboe@nelson.home.kernel.dk>2007-04-30 09:01:21 +0200
commit6d048f5310aa2dda2b5acd947eab3598c25e269f (patch)
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parent1e3335de05da3dfbe48b8caa03db1834a2133256 (diff)
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cfq-iosched: development update
- Implement logic for detecting cooperating processes, so we choose the best available queue whenever possible. - Improve residual slice time accounting. - Remove dead code: we no longer see async requests coming in on sync queues. That part was removed a long time ago. That means that we can also remove the difference between cfq_cfqq_sync() and cfq_cfqq_class_sync(), they are now indentical. And we can kill the on_dispatch array, just make it a counter. - Allow a process to go into the current list, if it hasn't been serviced in this scheduler tick yet. Possible future improvements including caching the cfqq lookup in cfq_close_cooperator(), so we don't have to look it up twice. cfq_get_best_queue() should just use that last decision instead of doing it again. Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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