linux-kernel - Re: [PATCH 3/6] mm: kswapd: Use the order that kswapd was reclaiming at for sleeping

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Message-Id: <20101210101802.81b04765.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Fri, 10 Dec 2010 10:18:02 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Mel Gorman <mel@....ul.ie>
Cc:	Simon Kirby <sim@...tway.ca>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Shaohua Li <shaohua.li@...el.com>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/6] mm: kswapd: Use the order that kswapd was
 reclaiming at for sleeping_prematurely()

On Thu,  9 Dec 2010 11:18:17 +0000
Mel Gorman <mel@....ul.ie> wrote:

> Before kswapd goes to sleep, it uses sleeping_prematurely() to check if
> there was a race pushing a zone below its watermark. If the race
> happened, it stays awake. However, balance_pgdat() can decide to reclaim
> at a lower order if it decides that high-order reclaim is not working as
> expected. This information is not passed back to sleeping_prematurely().
> The impact is that kswapd remains awake reclaiming pages long after it
> should have gone to sleep. This patch passes the adjusted order to
> sleeping_prematurely and uses the same logic as balance_pgdat to decide
> if it's ok to go to sleep.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>

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