linux-kernel - Re: [PATCH] memory: add kernelcore_max

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Message-Id: <20120511133939.25b5a738.akpm@linux-foundation.org>
Date:	Fri, 11 May 2012 13:39:39 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memory: add kernelcore_max_addr boot option

On Fri, 11 May 2012 13:46:04 +0800
Lai Jiangshan <laijs@...fujitsu.com> wrote:

> Current ZONE_MOVABLE (kernelcore=) setting policy with boot option doesn't meet
> our requirement. We need something like kernelcore_max_addr= boot option
> to limit the kernelcore upper address.

Why do you need this?  Please fully describe the requirement/use case.

> The memory with higher address will be migratable(movable) and they
> are easier to be offline(always ready to be offline when the system don't require
> so much memory).
> 
> All kernelcore_max_addr=, kernelcore= and movablecore= can be safely specified
> at the same time(or any 2 of them).
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