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cfq-iosched: commenting non-obvious initialization

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Added a comment to explain the initialization of last_delayed_sync.

Signed-off-by: Corrado Zoccolo <czoccolo@gmail.com>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Corrado Zoccolo 2009-12-09 20:56:04 +01:00 • committed by Jens Axboe
parent 7667aa0630
commit edc71131c4
1 changed files with 4 additions and 0 deletions
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block/cfq-iosched.c
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@ -3759,6 +3759,10 @@ static void *cfq_init_queue(struct request_queue *q)
cfqd->cfq_latency = 1; cfqd->cfq_latency = 1;
cfqd->cfq_group_isolation = 0; cfqd->cfq_group_isolation = 0;
cfqd->hw_tag = -1; cfqd->hw_tag = -1;
/*
* we optimistically start assuming sync ops weren't delayed in last
* second, in order to have larger depth for async operations.
*/
cfqd->last_delayed_sync = jiffies - HZ; cfqd->last_delayed_sync = jiffies - HZ;
INIT_RCU_HEAD(&cfqd->rcu); INIT_RCU_HEAD(&cfqd->rcu);
return cfqd; return cfqd;