linux-kernel - Re: [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory

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Message-ID: <504D467D.2080201@jp.fujitsu.com>
Date:	Mon, 10 Sep 2012 10:46:37 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	<wency@...fujitsu.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>, <x86@...nel.org>,
	<linux-mm@...ck.org>, <linux-kernel@...r.kernel.org>,
	<linuxppc-dev@...ts.ozlabs.org>, <linux-acpi@...r.kernel.org>,
	<linux-s390@...r.kernel.org>, <linux-sh@...r.kernel.org>,
	<linux-ia64@...r.kernel.org>, <cmetcalf@...era.com>,
	<sparclinux@...r.kernel.org>, <rientjes@...gle.com>,
	<liuj97@...il.com>, <len.brown@...el.com>,
	<benh@...nel.crashing.org>, <paulus@...ba.org>, <cl@...ux.com>,
	<minchan.kim@...il.com>, <kosaki.motohiro@...fujitsu.com>
Subject: Re: [RFC v8 PATCH 00/20] memory-hotplug: hot-remove physical memory

Hi Wen,

2012/09/01 5:49, Andrew Morton wrote:
> On Tue, 28 Aug 2012 18:00:07 +0800
> wency@...fujitsu.com wrote:
>
>> This patch series aims to support physical memory hot-remove.
>
> Have you had much review and testing feedback yet?
>
>> The patches can free/remove the following things:
>>
>>    - acpi_memory_info                          : [RFC PATCH 4/19]
>>    - /sys/firmware/memmap/X/{end, start, type} : [RFC PATCH 8/19]
>>    - iomem_resource                            : [RFC PATCH 9/19]
>>    - mem_section and related sysfs files       : [RFC PATCH 10-11, 13-16/19]
>>    - page table of removed memory              : [RFC PATCH 12/19]
>>    - node and related sysfs files              : [RFC PATCH 18-19/19]
>>
>> If you find lack of function for physical memory hot-remove, please let me
>> know.
>

> I doubt if many people have hardware which permits physical memory
> removal?  How would you suggest that people with regular hardware can
> test these chagnes?

How do you test the patch? As Andrew says, for hot-removing memory,
we need a particular hardware. I think so too. So many people may want
to know how to test the patch.
If we apply following patch to kvm guest, can we hot-remove memory on
kvm guest?

http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01389.html

Thanks,
Yasuaki Ishimatsu

>
>> Known problems:
>> 1. memory can't be offlined when CONFIG_MEMCG is selected.
>
> That's quite a problem!  Do you have a description of why this is the
> case, and a plan for fixing it?
>


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