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

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Date:	Wed, 28 Nov 2012 13:21:31 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Jiang Liu <jiang.liu@...wei.com>
CC:	Tang Chen <tangchen@...fujitsu.com>,
	wujianguo <wujianguo106@...il.com>, hpa@...or.com,
	akpm@...ux-foundation.org, rob@...dley.net,
	isimatu.yasuaki@...fujitsu.com, laijs@...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

At 11/28/2012 12:01 PM, Jiang Liu Wrote:
> 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.

The OS auto does it? Or the user coverts it?

We can convert pages from movable zones into normal zones by the following
interface:
echo online_kernel >/sys/devices/system/memory/memoryX/state

We have posted a patchset to implement it, and it is in mm tree now.

Thanks
Wen Congyang

> 
> Regards!
> Gerry
> 
>>
>>>
>>> Thanks,
>>> Jianguo Wu
>>>
>>
>> .
>>
> 
> 
> 

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