linux-kernel - Re: [Patch v4 00/12] memory-hotplug: hot-remove physical memory

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Date:	Fri, 30 Nov 2012 14:37:41 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Wen Congyang <wency@...fujitsu.com>, 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, David Rientjes <rientjes@...gle.com>,
	Jiang Liu <liuj97@...il.com>, Len Brown <len.brown@...el.com>,
	benh@...nel.crashing.org, paulus@...ba.org,
	Christoph Lameter <cl@...ux.com>,
	Minchan Kim <minchan.kim@...il.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	Jianguo Wu <wujianguo@...wei.com>
Subject: Re: [Patch v4 00/12] memory-hotplug: hot-remove physical memory

Hi Andrew,

On 11/28/2012 03:27 AM, Andrew Morton wrote:
>>
>> - acpi framework
>>    https://lkml.org/lkml/2012/10/26/175
>
> What's happening with the acpi framework?  has it received any feedback
> from the ACPI developers?

About ACPI framework, we are trying to do the following.

     The memory device can be removed by 2 ways:
     1. send eject request by SCI
     2. echo 1 >/sys/bus/pci/devices/PNP0C80:XX/eject

     In the 1st case, acpi_memory_disable_device() will be called.
     In the 2nd case, acpi_memory_device_remove() will be called.
     acpi_memory_device_remove() will also be called when we unbind the
     memory device from the driver acpi_memhotplug or a driver
     initialization fails.

     acpi_memory_disable_device() has already implemented a code which
     offlines memory and releases acpi_memory_info struct . But
     acpi_memory_device_remove() has not implemented it yet.

     So the patch prepares the framework for hot removing memory and
     adds the framework into acpi_memory_device_remove().

All the ACPI related patches have been put into the linux-next branch
of the linux-pm.git tree as v3.8 material.Please refer to the following
url.
https://lkml.org/lkml/2012/11/2/160

So for now, with this patch set, we can do memory hot-remove on x86_64
linux.

I do hope you would merge them before 3.8-rc1, so that we can use this
functionality in 3.8.

As we are still testing all memory hotplug related functionalities, I
hope we can do the bug fix during 3.8 rc.

Thanks. :)




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