From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gui Jianfeng Subject: Re: [PATCH 03/24] io-controller: Common flat fair queuing code in elevaotor layer Date: Wed, 19 Aug 2009 11:36:22 +0800 Message-ID: <4A8B7336.7010800@cn.fujitsu.com> References: <1250451046-9966-1-git-send-email-vgoyal@redhat.com> <1250451046-9966-4-git-send-email-vgoyal@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1250451046-9966-4-git-send-email-vgoyal@redhat.com> Sender: linux-kernel-owner@vger.kernel.org To: Vivek Goyal Cc: linux-kernel@vger.kernel.org, containers@lists.linux-foundation.org, dm-devel@redhat.com, jens.axboe@oracle.com, ryov@valinux.co.jp, balbir@linux.vnet.ibm.com, righi.andrea@gmail.com, nauman@google.com, dpshah@google.com, lizf@cn.fujitsu.com, mikew@google.com, fchecconi@gmail.com, paolo.valente@unimore.it, fernando@oss.ntt.co.jp, s-uchida@ap.jp.nec.com, taka@valinux.co.jp, jmoyer@redhat.com, dhaval@linux.vnet.ibm.com, m-ikeda@ds.jp.nec.com, agk@redhat.com, akpm@linux-foundation.org, peterz@infradead.org, jmarchan@redhat.com List-Id: dm-devel.ids Vivek Goyal wrote: ... > + > +static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq) > +{ > + elv_log_ioq(q->elevator->efqd, ioq, "preempt"); > + elv_slice_expired(q); > + > + /* > + * Put the new queue at the front of the of the current list, > + * so we know that it will be selected next. > + */ > + > + requeue_ioq(ioq); > + ioq->slice_start = ioq->slice_end = 0; I think this assignment is redundant because these two members will be reset when this ioq is scheduled. Signed-off-by: Gui Jianfeng --- block/elevator-fq.c | 1 - 1 files changed, 0 insertions(+), 1 deletions(-) diff --git a/block/elevator-fq.c b/block/elevator-fq.c index d04e925..b3c387d 100644 --- a/block/elevator-fq.c +++ b/block/elevator-fq.c @@ -2650,7 +2650,6 @@ static void elv_preempt_queue(struct request_queue *q, struct io_queue *ioq) */ requeue_ioq(ioq); - ioq->slice_start = ioq->slice_end = 0; elv_mark_ioq_slice_new(ioq); } } -- 1.5.4.rc3