linux-kernel - Re: [PATCH 4/6] mm: kswapd: Reset kswapd_max_order and classzone

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Message-ID: <20101209155925.GD1740@barrios-desktop>
Date:	Fri, 10 Dec 2010 00:59:25 +0900
From:	Minchan Kim <minchan.kim@...il.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 4/6] mm: kswapd: Reset kswapd_max_order and
 classzone_idx after reading

On Thu, Dec 09, 2010 at 11:18:18AM +0000, Mel Gorman wrote:
> When kswapd wakes up, it reads its order and classzone from pgdat and
> calls balance_pgdat. While its awake, it potentially reclaimes at a high
> order and a low classzone index. This might have been a once-off that
> was not required by subsequent callers. However, because the pgdat
> values were not reset, they remain artifically high while
> balance_pgdat() is running and potentially kswapd enters a second
> unnecessary reclaim cycle. Reset the pgdat order and classzone index
> after reading.
> 
> Signed-off-by: Mel Gorman <mel@....ul.ie>
Reviewed-by: Minchan Kim <minchan.kim@...il.com>

-- 
Kind regards,
Minchan Kim
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