linux-kernel - Re: [PATCH 2/8] readahead: make default readahead size a kernel parameter

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Date:	Mon, 21 Nov 2011 05:01:37 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	linux-fsdevel@...r.kernel.org, Ankit Jain <radical@...il.com>,
	Dave Chinner <david@...morbit.com>,
	Christian Ehrhardt <ehrhardt@...ux.vnet.ibm.com>,
	Rik van Riel <riel@...hat.com>,
	Nikanth Karthikesan <knikanth@...e.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 2/8] readahead: make default readahead size a kernel
 parameter

On Mon, Nov 21, 2011 at 05:18:21PM +0800, Wu Fengguang wrote:
> From: Nikanth Karthikesan <knikanth@...e.de>
> 
> Add new kernel parameter "readahead=", which allows user to override
> the static VM_MAX_READAHEAD=128kb.

Is a boot-time paramter really such a good idea?  I would at least make
it a sysctl so that it's run-time controllable, including beeing able
to set it from initscripts.

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