linux-kernel - Re: [PATCH 7/8] readahead: basic support for backwards prefetching

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Message-Id: <20111121153309.d2a410fb.akpm@linux-foundation.org>
Date:	Mon, 21 Nov 2011 15:33:09 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	<linux-fsdevel@...r.kernel.org>, Andi Kleen <andi@...stfloor.org>,
	Li Shaohua <shaohua.li@...el.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] readahead: basic support for backwards prefetching

On Mon, 21 Nov 2011 17:18:26 +0800
Wu Fengguang <fengguang.wu@...el.com> wrote:

> Add the backwards prefetching feature. It's pretty simple if we don't
> support async prefetching and interleaved reads.

Well OK, but I wonder how many applications out there read files in
reverse order.  Is it common enough to bother special-casing in the
kernel like this?


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