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

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Message-ID: <4FB06F09.5060105@jp.fujitsu.com>
Date:	Mon, 14 May 2012 11:33:45 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Lai Jiangshan <laijs@...fujitsu.com>, 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

Hi Andrew,

2012/05/12 5:39, Andrew Morton wrote:
> 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.

We want to create removable node for removing a system board
which equip CPU and memory at runtime. To do this, all memory
of a node on system board must be allocated as ZONE_MOVABLE.
But current linux cannot do it.
So we create removable node by limiting the memory address of
the kernelcore by the boot option.

Thanks,
Yasuaki Ishimatsu

>> 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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