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

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Message-ID: <20070519113501.GB25563@one.firstfloor.org>
Date:	Sat, 19 May 2007 13:35:01 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Fengguang Wu <wfg@...l.ustc.edu.cn>, 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

> 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.
 
On 64bit there is no particular shortage of page flags. If you ever do
racy things please do them 32bit only.

-Andi

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