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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/