linux-kernel - Re: [PATCH v2 -mmotm-2010-01-06-14-34] check high watermark after shrink zone

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Date:	Sun, 10 Jan 2010 22:46:26 -0500
From:	Rik van Riel <riel@...hat.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>, linux-mm <linux-mm@...ck.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [PATCH v2 -mmotm-2010-01-06-14-34] check high watermark after
 shrink zone

On 01/10/2010 06:48 PM, Minchan Kim wrote:
>
>
>   * V2
>    * Add reviewed-by singed-off (Thanks Kosaki, Wu)
>    * Fix typo of changelog
>
> == CUT HERE ==
>
> 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.
>
> I think the watermark check before shrink zone is pointless.
> Kswapd try to shrink zone then the check is meaninful.
>
> This patch move the check after shrink zone.
>
> Signed-off-by: Minchan Kim<minchan.kim@...il.com>
> Reviewed-by: KOSAKI Motohiro<kosaki.motohiro@...fujitsu.com>
> Reviewed-by: Wu Fengguang<fengguang.wu@...el.com>
> CC: Mel Gorman<mel@....ul.ie>
> CC: Rik van Riel<riel@...hat.com>

Acked-by: Rik van Riel <riel@...hat.com>

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