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Message-ID: <20100110142549.GA14610@localhost>
Date: Sun, 10 Jan 2010 22:25:49 +0800
From: Wu Fengguang <fengguang.wu@...el.com>
To: Minchan Kim <minchan.kim@...il.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Mel Gorman <mel@....ul.ie>, Rik van Riel <riel@...hat.com>,
linux-mm <linux-mm@...ck.org>,
lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -mmotm-2010-01-06-14-34] check high watermark after
shrink zone
On Fri, Jan 08, 2010 at 02:12:35PM +0900, Minchan Kim wrote:
> Kswapd check that zone have enough free by zone_water_mark.
> If any zone doesn't have enough page, it set all_zones_ok to zero.
> all_zone_ok makes kswapd retry not sleeping.
!all_zone_ok :)
> I think the watermark check before shrink zone is pointless.
> Kswapd try to shrink zone then the check is meaningul.
>
> This patch move the check after shrink zone.
This tends to make kswapd do less work in one invocation, with lower
priority. Looks at least not bad to me :) Thanks!
Reviewed-by: Wu Fengguang <fengguang.wu@...el.com>
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