linux-kernel - Re: [PATCH v2 0/5] Add movablecore

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Message-ID: <50B58CA9.9010606@huawei.com>
Date:	Wed, 28 Nov 2012 12:01:45 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	Tang Chen <tangchen@...fujitsu.com>
CC:	wujianguo <wujianguo106@...il.com>, <hpa@...or.com>,
	<akpm@...ux-foundation.org>, <rob@...dley.net>,
	<isimatu.yasuaki@...fujitsu.com>, <laijs@...fujitsu.com>,
	<wency@...fujitsu.com>, <linfeng@...fujitsu.com>,
	<yinghai@...nel.org>, <kosaki.motohiro@...fujitsu.com>,
	<minchan.kim@...il.com>, <mgorman@...e.de>, <rientjes@...gle.com>,
	<rusty@...tcorp.com.au>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, <linux-doc@...r.kernel.org>
Subject: Re: [PATCH v2 0/5] Add movablecore_map boot option

On 2012-11-28 11:47, Tang Chen wrote:
> On 11/27/2012 11:10 AM, wujianguo wrote:
>>
>> Hi Tang,
>>     DMA address can't be set as movable, if some one boot kernel with
>> movablecore_map=4G@...00000 or other memory region that contains DMA address,
>> system maybe boot failed. Should this case be handled or mentioned
>> in the change log and kernel-parameters.txt?
> 
> Hi Wu,
> 
> I think we can use MAX_DMA_PFN and MAX_DMA32_PFN to prevent setting DMA
> address as movable. Just ignore the address lower than them, and set
> the rest as movable. How do you think ?
> 
> And, since we cannot figure out the minimum of memory kernel needs, I
> think for now, we can just add some warning into kernel-parameters.txt.
> 
> Thanks. :)
On one other OS, there is a mechanism to dynamically convert pages from
movable zones into normal zones.

Regards!
Gerry

> 
>>
>> Thanks,
>> Jianguo Wu
>>
> 
> .
> 


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