linux-kernel - Re: [PATCH-RFC] cfq: Disable low

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Message-Id: <20091127152824.A7EA.A69D9226@jp.fujitsu.com>
Date:	Fri, 27 Nov 2009 15:29:10 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	kosaki.motohiro@...fujitsu.com, Mel Gorman <mel@....ul.ie>,
	Corrado Zoccolo <czoccolo@...il.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Frans Pop <elendil@...net.nl>, Jiri Kosina <jkosina@...e.cz>,
	Sven Geggus <lists@...hsschwanzdomain.de>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Tobias Oetiker <tobi@...iker.ch>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Stephan von Krawczynski <skraw@...net.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH-RFC] cfq: Disable low_latency by default for 2.6.32

> Instead, PF_MEMALLOC is good idea?

This patch was obviously wrong. please forget it. i'm sorry.

> 
> 
> Subject: [PATCH] cfq: Do not limit the async queue depth while memory reclaim
> 
> Not-Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> (I haven't test this)
> ---
>  block/cfq-iosched.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
> index aa1e953..9546f64 100644
> --- a/block/cfq-iosched.c
> +++ b/block/cfq-iosched.c
> @@ -1308,7 +1308,8 @@ static bool cfq_may_dispatch(struct cfq_data *cfqd, struct cfq_queue *cfqq)
>  	 * We also ramp up the dispatch depth gradually for async IO,
>  	 * based on the last sync IO we serviced
>  	 */
> -	if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency) {
> +	if (!cfq_cfqq_sync(cfqq) && cfqd->cfq_latency &&
> +	    !(current->flags & PF_MEMALLOC)) {
>  		unsigned long last_sync = jiffies - cfqd->last_end_sync_rq;
>  		unsigned int depth;
>  
> -- 
> 1.6.5.2
> 
> 
> 
> 
> 
> 



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