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

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Message-ID: <Pine.LNX.4.64.0705200009330.18989@schroedinger.engr.sgi.com>
Date:	Sun, 20 May 2007 00:10:27 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Fengguang Wu <wfg@...l.ustc.edu.cn>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	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>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 1/9] readahead: introduce PG_readahead

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.
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