linux-kernel - Re: [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore

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Date:	Tue, 27 Nov 2012 11:22:14 +0800
From:	Jianguo Wu <wujianguo@...wei.com>
To:	Wen Congyang <wency@...fujitsu.com>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	wujianguo <wujianguo106@...il.com>, <akpm@...ux-foundation.org>,
	<rob@...dley.net>, <isimatu.yasuaki@...fujitsu.com>,
	<laijs@...fujitsu.com>, <linfeng@...fujitsu.com>,
	<jiang.liu@...wei.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>, <qiuxishi@...wei.com>
Subject: Re: [PATCH v2 5/5] page_alloc: Bootmem limit with movablecore_map

On 2012/11/27 11:19, Wen Congyang wrote:

> At 11/27/2012 08:58 AM, Jianguo Wu Wrote:
>> On 2012/11/26 23:48, H. Peter Anvin wrote:
>>
>>> On 11/26/2012 05:15 AM, Tang Chen wrote:
>>>>
>>>> Hi Wu,
>>>>
>>>> That is really a problem. And, before numa memory got initialized,
>>>> memblock subsystem would be used to allocate memory. I didn't find any
>>>> approach that could fully address it when I making the patches. There
>>>> always be risk that memblock allocates memory on ZONE_MOVABLE. I think
>>>> we can only do our best to prevent it from happening.
>>>>
>>>> Your patch is very helpful. And after a shot look at the code, it seems
>>>> that acpi_numa_memory_affinity_init() is an architecture dependent
>>>> function. Could we do this somewhere which is not depending on the
>>>> architecture ?
>>>>
>>>
>>> The movable memory should be classified as a non-RAM type in memblock,
>>> that way we will not allocate from it early on.
>>>
>>> 	-hpa
>>
>>
>> yep, we can put movable memory in reserved.regions in memblock.
> 
> Hmm, I don't think so. If so, memory in reserved.regions contain two type
> memory: bootmem and movable memory. We will put all pages not in reserved.regions
> into buddy system. If we put movable memory in reserved.regions, we have
> no chance to put them to buddy system, and can't use them after system boots.
> 

yes, you are right. Or we can fix movablecore_map when add memory region to memblock.

> Thanks
> Wen Congyang
> 
>>
>>>
>>>
>>> .
>>>
>>
>>
>>
>>
> 
> 
> .
> 



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