cfq-iosched: commenting non-obvious initialization

Added a comment to explain the initialization of last_delayed_sync. Signed-off-by: Corrado Zoccolo <[email protected]> Acked-by: Jeff Moyer <[email protected]> Signed-off-by: Jens Axboe <[email protected]>
kyagi · Dec 9, 2009 · edc7113 · edc7113
1 parent 7667aa0
commit edc7113
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
@@ -3759,6 +3759,10 @@ static void *cfq_init_queue(struct request_queue *q)
 	cfqd->cfq_latency = 1;
 	cfqd->cfq_group_isolation = 0;
 	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;
 	INIT_RCU_HEAD(&cfqd->rcu);
 	return cfqd;