linux-kernel - Re: [PATCH -mmotm-2010-01-06-14-34] check high watermark after shrink zone

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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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