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

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Message-Id: <20070124115310.48cda374.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Wed, 24 Jan 2007 11:53:10 +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

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

> If we enter reclaim and the number of page cache pages
> is too high then we switch off swapping during reclaim
> to avoid touching anonymous pages.

In general, I like this (kind of) feature.

> +	/*
> +	 * If the page cache is too big then focus on page cache
> +	 * and ignore anonymous pages
> +	 */
> +	if (sc->may_swap && zone_page_state(zone, NR_FILE_PAGES)
> +			> zone->max_pagecache_pages)
> +		sc->may_swap = 0;
> +


How about adding this (kind of) check ?

if (sc->may_swap &&
    zone_page_state(zone, NR_FILE_PAGES) &&
    !(curreht->flags & PF_MEMALLOC))
	sc->may_swap = 0;

-Kame

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