cfq-iosched: never allow an async queue idling
Jens Axboe [Thu, 19 Apr 2007 12:32:26 +0000 (14:32 +0200)]
We don't enable it by default, don't let it get enabled during
runtime.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

block/cfq-iosched.c

index 839086d..df82755 100644 (file)
@@ -1603,7 +1603,12 @@ static void
 cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
                       struct cfq_io_context *cic)
 {
-       int enable_idle = cfq_cfqq_idle_window(cfqq);
+       int enable_idle;
+
+       if (!cfq_cfqq_sync(cfqq))
+               return;
+
+       enable_idle = cfq_cfqq_idle_window(cfqq);
 
        if (!cic->ioc->task || !cfqd->cfq_slice_idle ||
            (cfqd->hw_tag && CIC_SEEKY(cic)))