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cfq-iosched: implement slower async initiate and queue ramp up

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This slowly ramps up the async queue depth based on the time
passed since the sync IO, and doesn't allow async at all until
a sync slice period has passed.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2009-10-03 16:26:03 +02:00
parent 365722bb91
commit 8e29675555
3 changed files with 48 additions and 20 deletions
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4
include/linux/blkdev.h
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@@ -1147,7 +1147,11 @@ static inline void put_dev_sector(Sector p)
}
struct work_struct;
struct delayed_work;
int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
int kblockd_schedule_delayed_work(struct request_queue *q,
struct delayed_work *work,
unsigned long delay);
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))