linux-kernel - Re: [PATCH 21/25] io-controller: Per cgroup request descriptor support

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Date:	Wed, 8 Jul 2009 09:57:21 -0400
From:	Vivek Goyal <vgoyal@...hat.com>
To:	Gui Jianfeng <guijianfeng@...fujitsu.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 21/25] io-controller: Per cgroup request descriptor
	support

On Wed, Jul 08, 2009 at 11:27:25AM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> ...
> >  }
> > +#ifdef CONFIG_GROUP_IOSCHED
> > +static ssize_t queue_group_requests_show(struct request_queue *q, char *page)
> > +{
> > +	return queue_var_show(q->nr_group_requests, (page));
> > +}
> > +
> > +static ssize_t
> > +queue_group_requests_store(struct request_queue *q, const char *page,
> > +					size_t count)
> > +{
> > +	unsigned long nr;
> > +	int ret = queue_var_store(&nr, page, count);
> > +	if (nr < BLKDEV_MIN_RQ)
> > +		nr = BLKDEV_MIN_RQ;
> > +
> > +	spin_lock_irq(q->queue_lock);
> > +	q->nr_group_requests = nr;
> > +	spin_unlock_irq(q->queue_lock);
> > +	return ret;
> > +}
> > +#endif
> 
> Hi Vivek,
> 
> Do we need to update the congestion thresholds for allocated io groups?
> 

Good catch Gui. Thanks. I will test the patch and queue up for next posting.

Vivek

> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> ---
>  block/blk-sysfs.c |   15 +++++++++++++++
>  1 files changed, 15 insertions(+), 0 deletions(-)
> 
> diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
> index 577ed42..92b9f25 100644
> --- a/block/blk-sysfs.c
> +++ b/block/blk-sysfs.c
> @@ -83,17 +83,32 @@ static ssize_t queue_group_requests_show(struct request_queue *q, char *page)
>  	return queue_var_show(q->nr_group_requests, (page));
>  }
>  
> +extern void elv_io_group_congestion_threshold(struct request_queue *q,
> +					      struct io_group *iog);
> +
>  static ssize_t
>  queue_group_requests_store(struct request_queue *q, const char *page,
>  					size_t count)
>  {
> +	struct hlist_node *n;
> +	struct io_group *iog;
> +	struct elv_fq_data *efqd;
>  	unsigned long nr;
>  	int ret = queue_var_store(&nr, page, count);
> +
>  	if (nr < BLKDEV_MIN_RQ)
>  		nr = BLKDEV_MIN_RQ;
>  
>  	spin_lock_irq(q->queue_lock);
> +
>  	q->nr_group_requests = nr;
> +
> +	efqd = &q->elevator->efqd;
> +
> +	hlist_for_each_entry(iog, n, &efqd->group_list, elv_data_node) {
> +		elv_io_group_congestion_threshold(q, iog);
> +	}
> +
>  	spin_unlock_irq(q->queue_lock);
>  	return ret;
>  }
> -- 
> 1.5.4.rc3 
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