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cfq-iosched: Do not idle if slice_idle=0

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Do not idle either on cfq queue or service tree if slice_idle=0. User does
not want any queue or service tree idling. Currently even if slice_idle=0,
we were waiting for request to finish before expiring the queue and that
can lead to lower queue depths.

Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Vivek Goyal 2010-08-23 12:23:33 +02:00 committed by Jens Axboe
parent 75230ff275
commit b6508c1618
1 changed files with 4 additions and 1 deletions
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5
block/cfq-iosched.c
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@ -1839,6 +1839,9 @@ static bool cfq_should_idle(struct cfq_data *cfqd, struct cfq_queue *cfqq)
BUG_ON(!service_tree);
BUG_ON(!service_tree->count);
if (!cfqd->cfq_slice_idle)
return false;
/* We never do for idle class queues. */
if (prio == IDLE_WORKLOAD)
return false;
@ -1879,7 +1882,7 @@ static void cfq_arm_slice_timer(struct cfq_data *cfqd)
/*
* idle is disabled, either manually or by past process history
*/
if (!cfqd->cfq_slice_idle || !cfq_should_idle(cfqd, cfqq))
if (!cfq_should_idle(cfqd, cfqq))
return;
/*