linux-kernel - Re: [PATCH v3 0/3] ACPI: container hot remove support.

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Date:	Thu, 01 Nov 2012 09:48:52 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>,
	bhelgaas@...gle.com, lenb@...nel.org, jiang.liu@...wei.com,
	izumi.taku@...fujitsu.com, linux-acpi@...r.kernel.org,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 0/3] ACPI: container hot remove support.

Hi Yinghai,

How do you think the 1st patch ? Is the idea OK with you ?

And about the memory hotplug thing, so far as I know, we are trying to
limit kernel memory in some nodes, and only support to hot-remove the
nodes with out kernel memory. This functionality is called
online_movable. And some of the patches are already in next-tree, most
of the patches are under review. :)

Thanks. :)

On 11/01/2012 12:48 AM, Yinghai Lu wrote:
> On Wed, Oct 31, 2012 at 4:09 AM, Yasuaki Ishimatsu
> <isimatu.yasuaki@...fujitsu.com>  wrote:
>>> patch 2. Introduce a new function container_device_remove() to handle
>>>            ACPI_NOTIFY_EJECT_REQUEST event for container.
>>
>> If container device contains memory device, the function is
>> very danger. As you know, we are developing a memory hotplug.
>> If memory has kernel memory, memory hot remove operations fails.
>> But container_device_remove() cannot realize it. So even if
>> the memory hot remove operation fails, container_device_remove()
>> keeps hot remove operation. Finally, the function sends _EJ0
>> to firmware. In this case, if the memory is accessed, kernel
>> panic occurs.
>> The example is as follows:
>>
>>   https://lkml.org/lkml/2012/9/26/318
>
> so what is the overall status memory hot-remove?
> how are following memory get processed ?
> 1. memory for kernel text, module
> 2. page table
> 3. vmemmap
> 4. memory for kmalloc, for dma
>

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