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

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Date:	Mon, 18 Aug 2014 15:20:58 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Zhang Zhen <zhenzhang.zhang@...wei.com>,
	Toshi Kani <toshi.kani@...com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	David Rientjes <rientjes@...gle.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

(2014/08/18 12:25), Zhang Zhen wrote:
> 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.

I like Toshi's idea (valid_online_types).

Thanks,
Yasuaki Ishimatsu

> If not, let's leave it as it is.
>
> Best regards!
>> Thanks,
>> -Toshi
>>
>>
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
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>>
>>
>
>


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