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authorCorrado Zoccolo <czoccolo@gmail.com>2009-12-09 20:56:04 +0100
committerJens Axboe <jens.axboe@oracle.com>2009-12-09 20:56:04 +0100
commitedc71131c4dc6cc73e2a24aa0a7a79cfce738f12 (patch)
treeb568734b3f053be12f0dabcf2ceea1049537cea1 /block
parent7667aa0630407bc07dc38dcc79d29cc0a65553c1 (diff)
downloadvexpress-lsk-edc71131c4dc6cc73e2a24aa0a7a79cfce738f12.tar.gz
cfq-iosched: commenting non-obvious initialization
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>
Diffstat (limited to 'block')
-rw-r--r--block/cfq-iosched.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 98b15b98b85..69ecee7f4ad 100644
--- 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;