linux-kernel - Re: [PATCH 18/19] io-controller: Debug hierarchical IO scheduling

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Message-ID: <20090619140854.GC3726@redhat.com>
Date:	Fri, 19 Jun 2009 10:08:54 -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 18/19] io-controller: Debug hierarchical IO scheduling

On Fri, Jun 19, 2009 at 02:26:06PM +0800, Gui Jianfeng wrote:
> Vivek Goyal wrote:
> ...
> > +static inline void bfq_account_for_entity_addition(struct io_entity *entity)
> > +{
> > +	struct io_group *iog = io_entity_to_iog(entity);
> > +
> > +	if (iog) {
> > +		struct elv_fq_data *efqd;
> > +		char path[128];
> > +
> > +		/*
> > +		 * Keep track of how many times a group has been removed
> > +		 * from active tree because it did not have any active
> > +		 * backlogged ioq under it
> > +		 */
> > +		iog->queue++;
> > +		iog->queue_start = jiffies;
> > +
> > +		/* Log group addition event */
> > +		rcu_read_lock();
> > +		efqd = rcu_dereference(iog->key);
> > +		if (efqd) {
> > +			io_group_path(iog, path, sizeof(path));
> > +			elv_log(efqd, "add group=%s weight=%ld", path,
> > +					iog->entity.weight);
> 
> Since cgroup path is already cached, why not use it. :)
> 

Thanks Gui. Queued for next posting.

Vivek

> Signed-off-by: Gui Jianfeng <guijianfeng@...fujitsu.com>
> ---
>  block/elevator-fq.c |   12 ++++--------
>  1 files changed, 4 insertions(+), 8 deletions(-)
> 
> diff --git a/block/elevator-fq.c b/block/elevator-fq.c
> index bfa79c9..1a397c3 100644
> --- a/block/elevator-fq.c
> +++ b/block/elevator-fq.c
> @@ -183,7 +183,6 @@ static inline void bfq_account_for_entity_addition(struct io_entity *entity)
>  
>  	if (iog) {
>  		struct elv_fq_data *efqd;
> -		char path[128];
>  
>  		/*
>  		 * Keep track of how many times a group has been removed
> @@ -197,9 +196,8 @@ static inline void bfq_account_for_entity_addition(struct io_entity *entity)
>  		rcu_read_lock();
>  		efqd = rcu_dereference(iog->key);
>  		if (efqd) {
> -			io_group_path(iog, path, sizeof(path));
> -			elv_log(efqd, "add group=%s weight=%ld", path,
> -					iog->entity.weight);
> +			elv_log(efqd, "add group=%s weight=%ld", iog->path,
> +				iog->entity.weight);
>  		}
>  		rcu_read_unlock();
>  	}
> @@ -215,7 +213,6 @@ static inline void bfq_account_for_entity_deletion(struct io_entity *entity)
>  
>  	if (iog) {
>  		struct elv_fq_data *efqd;
> -		char path[128];
>  
>  		iog->dequeue++;
>  		/* Keep a track of how long group was on active tree */
> @@ -227,9 +224,8 @@ static inline void bfq_account_for_entity_deletion(struct io_entity *entity)
>  		rcu_read_lock();
>  		efqd = rcu_dereference(iog->key);
>  		if (efqd) {
> -			io_group_path(iog, path, sizeof(path));
> -			elv_log(efqd, "del group=%s weight=%ld", path,
> -					iog->entity.weight);
> +			elv_log(efqd, "del group=%s weight=%ld", iog->path,
> +				iog->entity.weight);
>  		}
>  		rcu_read_unlock();
>  	}
> -- 
> 1.5.4.rc3
> 
> 
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