提交 35e6077c 编写于 作者: J Jens Axboe 提交者: Jens Axboe

[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: NJens Axboe <axboe@suse.de>
上级 b17fd9bc
......@@ -1388,10 +1388,9 @@ static inline void changed_ioprio(struct cfq_io_context *cic)
}
}
cfqq = cic->cfqq[SYNC];
if (cfqq) {
if (cfqq)
cfq_mark_cfqq_prio_changed(cfqq);
cfq_init_prio_data(cfqq);
}
spin_unlock(cfqd->queue->queue_lock);
}
}
......
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