At 09/10/2012 09:46 AM, Yasuaki Ishimatsu Wrote:
> Hi Wen,
>
> 2012/09/01 5:49, Andrew Morton wrote:
>> On Tue, 28 Aug 2012 18:00:07 +0800
>> wency@xxxxxxxxxxxxxx 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
Yes, if we apply this patchset, we can test hot-remove memory on kvm guest.
But that patchset doesn't implement _PS3, so there is some restriction.
Thanks
Wen Congyang
>
> 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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