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

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Date:	Mon, 18 Aug 2014 11:25:36 +0800
From:	Zhang Zhen <zhenzhang.zhang@...wei.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	David Rientjes <rientjes@...gle.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 2014/8/16 5:37, Toshi Kani wrote:
> On Wed, 2014-08-13 at 12:10 +0800, 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>
>> ---
>>  Documentation/ABI/testing/sysfs-devices-memory |  8 ++++
>>  Documentation/memory-hotplug.txt               |  4 +-
>>  drivers/base/memory.c                          | 62 ++++++++++++++++++++++++++
>>  include/linux/memory_hotplug.h                 |  1 +
>>  mm/memory_hotplug.c                            |  2 +-
>>  5 files changed, 75 insertions(+), 2 deletions(-)
>>
>> diff --git a/Documentation/ABI/testing/sysfs-devices-memory b/Documentation/ABI/testing/sysfs-devices-memory
>> index 7405de2..2b2a1d7 100644
>> --- a/Documentation/ABI/testing/sysfs-devices-memory
>> +++ b/Documentation/ABI/testing/sysfs-devices-memory
>> @@ -61,6 +61,14 @@ Users:		hotplug memory remove tools
>>  		http://www.ibm.com/developerworks/wikis/display/LinuxP/powerpc-utils
>>
>>
>> +What:           /sys/devices/system/memory/memoryX/zones_online_to
> 
> I think this name is a bit confusing.  How about "valid_online_types"?
> 
Thanks for your suggestion.

This patch has been added to -mm tree.
If most people think so, i would like to modify the interface name.
If not, let's leave it as it is.

Best regards!
> Thanks,
> -Toshi
> 
> 
> 
> --
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> 


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