linux-kernel - Re: [RFC][PATCH] a bit improvement of ZONE

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Message-Id: <20080117232147.85ae8cab.akpm@linux-foundation.org>
Date:	Thu, 17 Jan 2008 23:21:47 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Marcelo Tosatti <marcelo@...ck.org>,
	Rik van Riel <riel@...hat.com>,
	Daniel Spang <daniel.spang@...il.com>
Subject: Re: [RFC][PATCH] a bit improvement of ZONE_DMA page reclaim

On Fri, 18 Jan 2008 15:34:33 +0900 KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> Hi
> 
> on X86, ZONE_DMA is very very small.
> It is often no used at all. 

In that case page-reclaim is supposed to set all_unreclaimable and
basically ignores the zone altogether until it looks like something might
have changed.

Is that code not working?  (quite possible).


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