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Subject: Re: [PATCH] Memory hot added,The memory can not been added to movable
 zone
To: Changsheng Liu <liuchangsheng@inspur.com>,
        Yasuaki Ishimatsu <yasu.isimatu@gmail.com>,
        Andrew Morton <akpm@linux-foundation.org>
References: <1439972306-50845-1-git-send-email-liuchangsheng@inspur.com>
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Cc: isimatu.yasuaki@jp.fujitsu.com, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, yanxiaofeng@inspur.com,
        Changsheng Liu <liuchangcheng@inspur.com>
From: Vlastimil Babka <vbabka@suse.cz>
Message-ID: <55DD58D8.1090508@suse.cz>
Date: Wed, 26 Aug 2015 08:12:40 +0200
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On 26.8.2015 2:36, Changsheng Liu wrote:
> 
> 
> 在 2015/8/25 19:13, Vlastimil Babka 写道:
>> On 08/25/2015 12:25 PM, Changsheng Liu wrote:
>>> Thanks very much for your review, I can move the memory from normal zone
>>> to movable zone succesfully.
>>> And thank you for let me understand the memory mechanism better.
>>> 在 2015/8/25 3:15, Yasuaki Ishimatsu 写道:
>>
>> So you agree to drop the patch from -mm?
>      The system add memory to normal zone defaultly so that it can be 
> used by kernel and then we can not move the memory to movable zone.
>      The patch can add the memory to movable zone directlly.

I thought that you confirmed that the following works?
echo online_movable > /sys/devices/system/memory/memoryXXX/state

If you want it to be the default, there's the node_movable kernel boot option.
Does it work for you?