From: Christoph Lameter <clameter@sgi.com>
Subject: Re: [PATCH 1/9] readahead: introduce PG_readahead
Date: Sun, 20 May 2007 00:10:27 -0700 (PDT)
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Cc: Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org, Andi Kleen <andi@firstfloor.org>,
	Jens Axboe <jens.axboe@oracle.com>,
	Oleg Nesterov <oleg@tv-sign.ru>,
	Steven Pratt <slpratt@austin.ibm.com>,
	Ram Pai <linuxram@us.ibm.com>,
	"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>
To: Fengguang Wu <wfg@mail.ustc.edu.cn>
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On Sun, 20 May 2007, Fengguang Wu wrote:

> The reuse code would look like the attached one.
> It still needs more testing, and would fail if Christoph reuses
> PG_reclaim in higher order pagecache in the future.

Do not worry about that. All higher order pagecache patchsets remove that
sharing because we will then need these pages on the LRU and thus
PG_reclaim cannot be shared anymore.