linux-kernel - [PATCH 15/15] cfq-iosched: tighten queue request overlap condition

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Date:	Tue, 24 Apr 2007 10:15:43 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	linux-kernel@...r.kernel.org
Cc:	Jens Axboe <jens.axboe@...cle.com>
Subject: [PATCH 15/15] cfq-iosched: tighten queue request overlap condition

For tagged devices, allow overlap of requests if the idle window
isn't enabled on the current active queue.

Signed-off-by: Jens Axboe <jens.axboe@...cle.com>
---
 block/cfq-iosched.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
index 772df89..8093733 100644
--- a/block/cfq-iosched.c
+++ b/block/cfq-iosched.c
@@ -983,7 +983,8 @@ static struct cfq_queue *cfq_select_queue(struct cfq_data *cfqd)
 	 * flight or is idling for a new request, allow either of these
 	 * conditions to happen (or time out) before selecting a new queue.
 	 */
-	if (cfqq->dispatched || timer_pending(&cfqd->idle_slice_timer)) {
+	if (timer_pending(&cfqd->idle_slice_timer) ||
+	    (cfqq->dispatched && cfq_cfqq_idle_window(cfqq))) {
 		cfqq = NULL;
 		goto keep_queue;
 	}
-- 
1.5.1.1.190.g74474

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