linux-kernel - Re: [PATCH 2/2] block: separate priority boosting from REQ

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Date:	Tue, 23 Aug 2011 11:05:48 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Jens Axboe <jaxboe@...ionio.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] block: separate priority boosting from REQ_META

Hello,


Christoph Hellwig <hch@...radead.org> writes:
> Add a new REQ_PRIO to let requests preempt others in the cfq I/O schedule,
> and lave REQ_META purely for marking requests as metadata in blktrace.
>
> All existing callers of REQ_META except for XFS are updated to also
> set REQ_PRIO for now.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
>

snipped...

> Index: linux-2.6/include/linux/blk_types.h
> ===================================================================
> --- linux-2.6.orig/include/linux/blk_types.h	2011-08-22 04:25:50.373473791 +0200
> +++ linux-2.6/include/linux/blk_types.h	2011-08-22 04:26:44.443473870 +0200
> @@ -124,6 +124,7 @@ enum rq_flag_bits {
>  
>  	__REQ_SYNC,		/* request is sync (sync write or read) */
>  	__REQ_META,		/* metadata io request */
> +	__REQ_PRIO,

It'd be better if it's commented too, IMHO.


>  	__REQ_DISCARD,		/* request to discard sectors */
>  	__REQ_SECURE,		/* secure discard (used with __REQ_DISCARD) */
>  
> @@ -161,13 +162,14 @@ enum rq_flag_bits {
>  #define REQ_FAILFAST_DRIVER	(1 << __REQ_FAILFAST_DRIVER)
>  #define REQ_SYNC		(1 << __REQ_SYNC)
>  #define REQ_META		(1 << __REQ_META)
> +#define REQ_PRIO		(1 << __REQ_PRIO)
>  #define REQ_DISCARD		(1 << __REQ_DISCARD)
>  #define REQ_NOIDLE		(1 << __REQ_NOIDLE)
>  
>  #define REQ_FAILFAST_MASK \
>  	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
>  #define REQ_COMMON_MASK \
> -	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_DISCARD | \
> +	(REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_PRIO | REQ_DISCARD | \
>  	 REQ_NOIDLE | REQ_FLUSH | REQ_FUA | REQ_SECURE)
>  #define REQ_CLONE_MASK		REQ_COMMON_MASK
>  

I think you need to include REQ_META into REQ_COMMON_MASK in order to
track those requests using blktrace.

Thanks.
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