linux-kernel - Re: [PATCH v2] memory-hotplug: add sysfs zones_online

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Message-ID: <53F2ABD0.1010706@huawei.com>
Date:	Tue, 19 Aug 2014 09:43:44 +0800
From:	Zhang Zhen <zhenzhang.zhang@...wei.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>, <toshi.kani@...com>,
	<isimatu.yasuaki@...fujitsu.com>, <n-horiguchi@...jp.nec.com>,
	<wangnan0@...wei.com>, <linux-kernel@...r.kernel.org>,
	Linux MM <linux-mm@...ck.org>
Subject: Re: [PATCH v2] memory-hotplug: add sysfs zones_online_to attribute

On 2014/8/19 5:48, David Rientjes wrote:
> On Wed, 13 Aug 2014, Zhang Zhen wrote:
> 
>> Currently memory-hotplug has two limits:
>> 1. If the memory block is in ZONE_NORMAL, you can change it to
>> ZONE_MOVABLE, but this memory block must be adjacent to ZONE_MOVABLE.
>> 2. If the memory block is in ZONE_MOVABLE, you can change it to
>> ZONE_NORMAL, but this memory block must be adjacent to ZONE_NORMAL.
>>
>> With this patch, we can easy to know a memory block can be onlined to
>> which zone, and don't need to know the above two limits.
>>
>> Updated the related Documentation.
>>
>> Change v1 -> v2:
>> - optimize the implementation following Dave Hansen's suggestion
>>
>> Signed-off-by: Zhang Zhen <zhenzhang.zhang@...wei.com>
> 
> linux-next build failure:
> 
> drivers/built-in.o: In function `show_zones_online_to':
> memory.c:(.text+0x13ee09): undefined reference to `test_pages_in_a_zone'
> 
The function implementation in mm/memory_hotplug.c is only built if
CONFIG_MEMORY_HOTREMOVE is enabled.

A fix has been proposed.
http://ozlabs.org/~akpm/mmots/broken-out/memory-hotplug-add-sysfs-zones_online_to-attribute-fix-2.patch

Thanks!
> 


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