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[PATCH] cfq-iosched: correctly set ioprio on both targets 

Patch originally from Vasily Tarasov <vtaras@sw.ru>

If you set io-priority of process 1 using sys_ioprio_set system call by
another process 2 (like ionice do), then cfq_init_prio_data() function
sets priority of process 2 (current) on queue of process 1 and clears
the flag, that designates change of ioprio.  So the process  1 will work
like with priority of process 2.

I propose not to call cfq_init_prio_data() on io-priority change, but
only mark queue as queue with changed prority.  Every time when new
request comes cfq-scheduler checks for this flag and atomaticaly changes
priority of queue to new value.

Signed-off-by: Jens Axboe <axboe@suse.de>
This commit is contained in:
Jens Axboe 2006-06-14 09:10:45 +02:00 committed by Jens Axboe
parent b17fd9bceb
commit 35e6077cb1
1 changed files with 2 additions and 3 deletions
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5
block/cfq-iosched.c
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@ -1388,10 +1388,9 @@ static inline void changed_ioprio(struct cfq_io_context *cic)
} }
} }
cfqq = cic->cfqq[SYNC]; cfqq = cic->cfqq[SYNC];
if (cfqq) { if (cfqq)
cfq_mark_cfqq_prio_changed(cfqq); cfq_mark_cfqq_prio_changed(cfqq);
cfq_init_prio_data(cfqq);
}
spin_unlock(cfqd->queue->queue_lock); spin_unlock(cfqd->queue->queue_lock);
} }
} }