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

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Date:	Wed, 06 May 2009 17:40:43 -0400
From:	"IKEDA, Munehiro" <m-ikeda@...jp.nec.com>
To:	Vivek Goyal <vgoyal@...hat.com>
CC:	nauman@...gle.com, dpshah@...gle.com, lizf@...fujitsu.com,
	mikew@...gle.com, fchecconi@...il.com, paolo.valente@...more.it,
	jens.axboe@...cle.com, ryov@...inux.co.jp, fernando@....ntt.co.jp,
	s-uchida@...jp.nec.com, taka@...inux.co.jp,
	guijianfeng@...fujitsu.com, jmoyer@...hat.com,
	dhaval@...ux.vnet.ibm.com, balbir@...ux.vnet.ibm.com,
	linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org, righi.andrea@...il.com,
	agk@...hat.com, dm-devel@...hat.com, snitzer@...hat.com,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 18/18] io-controller: Debug hierarchical IO scheduling

Hi Vivek,

Patching and compilation error occurred on the 18/18 patch.
I know this is a patch for debug but report them in case.


Vivek Goyal wrote:
> @@ -2203,6 +2241,25 @@ EXPORT_SYMBOL(elv_get_slice_idle);
>  void elv_ioq_served(struct io_queue *ioq, bfq_service_t served)
>  {
>  	entity_served(&ioq->entity, served, ioq->nr_sectors);

Patch failed due to this line.  I guess this should be

	entity_served(&ioq->entity, served);


> +
> +#ifdef CONFIG_DEBUG_GROUP_IOSCHED
> +		{
> +			struct elv_fq_data *efqd = ioq->efqd;
> +			char path[128];
> +			struct io_group *iog = ioq_to_io_group(ioq);
> +			io_group_path(iog, path, sizeof(path));
> +			elv_log_ioq(efqd, ioq, "ioq served: QSt=0x%lx QSs=0x%lx"
> +				" QTt=0x%lx QTs=0x%lx grp=%s GTt=0x%lx "
> +				" GTs=0x%lx rq_queued=%d",
> +				served, ioq->nr_sectors,
> +				ioq->entity.total_service,
> +				ioq->entity.total_sector_service,
> +				path,
> +				iog->entity.total_service,
> +				iog->entity.total_sector_service,
> +				ioq->nr_queued);
> +		}
> +#endif
>  }

Because
  io_entity::total_service
and
  io_entity::total_sector_service
are not defined, compilation failed if CONFIG_DEBUG_GROUP_IOSCHED=y
here. (and everywhere referencing entity.total_service or  entity.total_sector_service)
They need to be defined like:

diff --git a/block/elevator-fq.h b/block/elevator-fq.h
index 1ea4ff3..6d0a735 100644
--- a/block/elevator-fq.h
+++ b/block/elevator-fq.h
@@ -147,6 +147,10 @@ struct io_entity {
        unsigned short ioprio_class, new_ioprio_class;
 
        int ioprio_changed;
+
+#ifdef CONFIG_DEBUG_GROUP_IOSCHED
+       unsigned long total_service, total_sector_service;
+#endif
 };
 
 /*

Unfortunately I couldn't figure out where and how the members
should be calculated, sorry.


-- 
IKEDA, Munehiro
  NEC Corporation of America
    m-ikeda@...jp.nec.com

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