linux-kernel - Re: [PATCH 20/25] io-controller: map async requests to appropriate cgroup

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Date:	Mon, 3 Aug 2009 21:25:55 -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 20/25] io-controller: map async requests to appropriate
	cgroup

On Mon, Aug 03, 2009 at 10:13:46AM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> ...
> > +
> > +struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio,
> > +					int create)
> > +{
> > +	struct page *page = NULL;
> > +
> > +	/*
> > +	 * Determine the group from task context. Even calls from
> > +	 * blk_get_request() which don't have any bio info will be mapped
> > +	 * to the task's group
> > +	 */
> > +	if (!bio)
> > +		goto sync;
> > +
> > +	if (bio_barrier(bio)) {
> > +		/*
> > +		 * Map barrier requests to root group. May be more special
> > +		 * bio cases should come here
> > +		 */
> > +		return q->elevator->efqd.root_group;
> > +	}
> > +
> > +	/* Map the sync bio to the right group using task context */
> > +	if (elv_bio_sync(bio))
> > +		goto sync;
> > +
> > +#ifdef CONFIG_TRACK_ASYNC_CONTEXT
> > +	/* Determine the group from info stored in page */
> > +	page = bio_iovec_idx(bio, 0)->bv_page;
> > +	return io_get_io_group(q, page, create);
> > +#endif
> > +
> > +sync:
> > +	return io_get_io_group(q, NULL, create);
> 
> Fix build warning.
> 
> block/elevator-fq.c: In function ‘io_get_io_group_bio’:
> block/elevator-fq.c:2075: warning: unused variable ‘page’
> 

Thanks Gui. Will apply in next posting.

Vivek

> ---
> diff --git a/block/elevator-fq.c b/block/elevator-fq.c
> index 66b10eb..d304f79 100644
> --- a/block/elevator-fq.c
> +++ b/block/elevator-fq.c
> @@ -2102,7 +2102,7 @@ struct io_group *io_get_io_group_bio(struct request_queue *q, struct bio *bio,
>  #endif
>  
>  sync:
> -	return io_get_io_group(q, NULL, create);
> +	return io_get_io_group(q, page, create);
>  }
>  EXPORT_SYMBOL(io_get_io_group_bio);
> 
> 
> > +}
> > +EXPORT_SYMBOL(io_get_io_group_bio);
> > +
> 
> 
> -- 
> Regards
> Gui Jianfeng
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