linux-kernel - Re: [PATCH 1/9] readahead: introduce PG

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Date:	Fri, 18 May 2007 23:28:24 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <andi@...stfloor.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	Oleg Nesterov <oleg@...sign.ru>,
	Steven Pratt <slpratt@...tin.ibm.com>,
	Ram Pai <linuxram@...ibm.com>
Subject: Re: [PATCH 1/9] readahead: introduce PG_readahead

On Thu, 17 May 2007 06:47:53 +0800 Fengguang Wu <wfg@...l.ustc.edu.cn> wrote:

> Introduce a new page flag: PG_readahead.

Is there any way in which we can avoid adding a new page flag?

We have the advantage that if the kernel very occasionally gets the wrong
result for PageReadahead(page), nothing particularly bad will happen, so we
can do racy things.

>From a quick peek, it appears that PG_readahead is only ever set against
non-uptodate pages.  If true we could perhaps exploit that: say,
PageReadahead(page) == PG_referenced && !PG_uptodate?
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