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

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Date:	Wed, 01 Jul 2009 09:40:33 +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: Re: [PATCH] io-controller: Don't expire an idle ioq if it's the	only
 ioq in hierarchy

Vivek Goyal wrote:
> On Tue, Jun 30, 2009 at 03:49:21PM +0800, Gui Jianfeng wrote:
>> Hi Vivek,
>>
>> We don't expect expiring an idle ioq if it's the only ioq 
>> in the hierarchy.
>>
> 
> Hi Gui,
> 
> This patch will avoid idle queue expiry for single ioq schedulers. But
> that's not an issue anyway as single ioq schedulers don't have the notion
> of idle queue. It is only CFQ which allows creation of idle ioq.

  Oh, yes, please ignore this mindless patch.

> 
> Thanks
> Vivek
> 
>> 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
>>
> 
> 
> 

-- 
Regards
Gui Jianfeng

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