linux-kernel - Re: [PATCH v5 0/5] Add movablecore

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Message-ID: <50F72333.60200@jp.fujitsu.com>
Date:	Wed, 16 Jan 2013 17:01:23 -0500
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	akpm@...ux-foundation.org
CC:	isimatu.yasuaki@...fujitsu.com, tony.luck@...el.com, hpa@...or.com,
	tangchen@...fujitsu.com, jiang.liu@...wei.com,
	wujianguo@...wei.com, wency@...fujitsu.com, laijs@...fujitsu.com,
	linfeng@...fujitsu.com, yinghai@...nel.org, rob@...dley.net,
	kosaki.motohiro@...fujitsu.com, minchan.kim@...il.com,
	mgorman@...e.de, rientjes@...gle.com, guz.fnst@...fujitsu.com,
	rusty@...tcorp.com.au, lliubbo@...il.com, jaegeuk.hanse@...il.com,
	glommer@...allels.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v5 0/5] Add movablecore_map boot option

On 1/16/2013 4:29 PM, Andrew Morton wrote:
> On Wed, 16 Jan 2013 15:25:44 +0900
> Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com> wrote:
> 
>>>
>>> Things I'm wondering:
>>>
>>> - is there *really* a case for retaining the boot option if/when
>>>    SRAT support is available?
>>
>> Yes. If SRAT support is available, all memory which enabled hotpluggable
>> bit are managed by ZONEMOVABLE. But performance degradation may
>> occur by NUMA because we can only allocate anonymous page and page-cache
>> from these memory.
>>
>> In this case, if user cannot change SRAT information, user needs a way to
>> select/set removable memory manually.
> 
> If I understand this correctly you mean that once SRAT parsing is
> implemented, the user can use movablecore_map to override that SRAT
> parsing, yes?  That movablecore_map will take precedence over SRAT?

I think movablecore_map (I prefer movablemem than it, btw) should behave so.
because of, for past three years, almost all memory hotplug bug was handled
only I and kamezawa-san and, afaik, both don't have hotremove aware specific
hardware.

So, if the new feature require specific hardware, we can't maintain this area
any more.


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