linux-kernel - Re: [RFC PATCH 1/12] memory-hotplug : rename remove_memory to offline

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Date:	Thu, 28 Jun 2012 11:25:16 +0800
From:	Wen Congyang <wency@...fujitsu.com>
To:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
CC:	rientjes@...gle.com, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-acpi@...r.kernel.org, len.brown@...el.com,
	benh@...nel.crashing.org, paulus@...ba.org, cl@...ux.com,
	minchan.kim@...il.com, akpm@...ux-foundation.org,
	kosaki.motohiro@...fujitsu.com
Subject: Re: [RFC PATCH 1/12] memory-hotplug : rename remove_memory to offline_memory

At 06/28/2012 11:01 AM, Yasuaki Ishimatsu Wrote:
> Hi David and Wen,
> 
> Thank you for reviewing my patch.
> 
> 2012/06/27 17:47, Wen Congyang wrote:
>> At 06/27/2012 03:14 PM, Wen Congyang Wrote:
>>> At 06/27/2012 01:42 PM, Yasuaki Ishimatsu Wrote:
>>>> remove_memory() does not remove memory but just offlines memory. The patch
>>>> changes name of it to offline_memory().
>>>
>>> There are 3 functions in the kernel:
>>> 1. add_memory()
>>> 2. online_pages()
>>> 3. remove_memory()
>>>
>>> So I think offline_pages() is better than offline_memory().
>>
>> There is already a function named offline_pages(). So we
>> should call offline_pages() instead of remove_memory() in
>> memory_block_action(), and there is no need to rename
>> remove_memory().
> 
> As Wen says, Linux has 4 functions for memory hotplug already.
> In my recognition, these functions are prepared for following purpose.
> 
> 1. add_memory     : add physical memory
> 2. online_pages   : online logical memory
> 3. remove_memory  : offline logical memory
> 4. offline_pages  : offline logical memory
> 
> add_memory() is used for adding physical memory. I think remove_memory()
> would rather be used for removing physical memory than be used for removing
> logical memory. So I renamed remove_memory() to offline_memory().
> How do you think?

Hmm, remove_memory() will revert all things we do in add_memory(), so I think
there is no need to rename it. If we rename it to offline_memory(), we should
also rename add_memory() to online_memory().

Thanks
Wen Congyang

> 
> Regards,
> Yasuaki Ishimatsu
> 
>>
>> Thanks
>> Wen Congyang
>>
>>>
>>> Thanks
>>> Wen Congyang
>>>>
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