linux-kernel - Re: [RFC] Limit the size of the pagecache

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Date:	Wed, 24 Jan 2007 12:13:18 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Christoph Lameter <clameter@....com>
Cc:	aubreylee@...il.com, svaidy@...ux.vnet.ibm.com,
	nickpiggin@...oo.com.au, rgetz@...ckfin.uclinux.org,
	Michael.Hennerich@...log.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC] Limit the size of the pagecache


one more thing...

On Tue, 23 Jan 2007 16:49:55 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> @@ -1168,6 +1170,11 @@ zonelist_scan:
>  			!cpuset_zone_allowed_softwall(zone, gfp_mask))
>  				goto try_next_zone;
>  
> +		if ((gfp_mask & __GFP_PAGECACHE) &&
> +				zone_page_state(zone, NR_FILE_PAGES) >
> +					zone->max_pagecache_pages)
> +				goto try_next_zone;
> +

I don't prefer to cause zone fallback by this.
This may use ZONE_DMA before exhausing ZONE_NORMAL (ia64),
ZONE_NORMAL before ZONE_HIGHMEM (x86).
Very rapid page allocation can eats some amount of lower zone.

Regards,
-Kame

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