linux-kernel - [PATCH] io-controller: Don't expire an idle ioq if it's the only ioq in hierarchy

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Date:	Tue, 30 Jun 2009 15:49:21 +0800
From:	Gui Jianfeng <guijianfeng@...fujitsu.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, dm-devel@...hat.com,
	jens.axboe@...cle.com, nauman@...gle.com, dpshah@...gle.com,
	lizf@...fujitsu.com, mikew@...gle.com, fchecconi@...il.com,
	paolo.valente@...more.it, ryov@...inux.co.jp,
	fernando@....ntt.co.jp, s-uchida@...jp.nec.com, taka@...inux.co.jp,
	jmoyer@...hat.com, dhaval@...ux.vnet.ibm.com,
	balbir@...ux.vnet.ibm.com, righi.andrea@...il.com,
	m-ikeda@...jp.nec.com, jbaron@...hat.com, agk@...hat.com,
	snitzer@...hat.com, akpm@...ux-foundation.org, peterz@...radead.org
Subject: [PATCH] io-controller: Don't expire an idle ioq if it's the only
 ioq in hierarchy

Hi Vivek,

We don't expect expiring an idle ioq if it's the only ioq 
in the hierarchy.

Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
---
 block/elevator-fq.c |   12 ++++++------
 1 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/block/elevator-fq.c b/block/elevator-fq.c
index 4270cfd..0b65e16 100644
--- a/block/elevator-fq.c
+++ b/block/elevator-fq.c
@@ -4058,12 +4058,6 @@ void elv_ioq_completed_request(struct request_queue *q, struct request *rq)
 			elv_clear_ioq_slice_new(ioq);
 		}
 
-		if (elv_ioq_class_idle(ioq)) {
-			if (elv_iosched_expire_ioq(q, 1, 0))
-				elv_ioq_slice_expired(q);
-			goto done;
-		}
-
 		/*
 		 * If there is only root group present, don't expire the queue
 		 * for single queue ioschedulers (noop, deadline, AS). It is
@@ -4077,6 +4071,12 @@ void elv_ioq_completed_request(struct request_queue *q, struct request *rq)
 			goto done;
 		}
 
+		if (elv_ioq_class_idle(ioq)) {
+			if (elv_iosched_expire_ioq(q, 1, 0))
+				elv_ioq_slice_expired(q);
+			goto done;
+		}
+
 		/* For async queue try to do wait busy */
 		if (efqd->fairness && !elv_ioq_sync(ioq) && !ioq->nr_queued
 		    && (elv_iog_nr_active(iog) <= 1)) {
-- 
1.5.4.rc3


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