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

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Message-ID: <50B434A9.3030600@cn.fujitsu.com>
Date:	Tue, 27 Nov 2012 11:34:01 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Jianguo Wu <wujianguo@...wei.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

At 11/27/2012 11:22 AM, Jianguo Wu Wrote:
> 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.

If so, we should know the nodes address range...

Thanks
Wen Congyang

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

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