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cfq: async queue allocation per priority

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If we have two processes with different ioprio_class, but the same
ioprio_data, their async requests will fall into the same queue. I guess
such behavior is not expected, because it's not right to put real-time
requests and best-effort requests in the same queue.

The attached patch fixes the problem by introducing additional *cfqq
fields on cfqd, pointing to per-(class,priority) async queues.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Vasily Tarasov 2007-07-20 10:06:38 +02:00 • committed by Jens Axboe
parent 9a79b22741
commit c2dea2d1fd
2 changed files with 52 additions and 12 deletions
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8
include/linux/ioprio.h
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@ -53,6 +53,14 @@ static inline int task_ioprio(struct task_struct *task)
return IOPRIO_NORM;
}
static inline int task_ioprio_class(struct task_struct *task)
{
if (ioprio_valid(task->ioprio))
return IOPRIO_PRIO_CLASS(task->ioprio);
return IOPRIO_CLASS_BE;
}
static inline int task_nice_ioprio(struct task_struct *task)
{
return (task_nice(task) + 20) / 5;